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CN105637053B - Adhesive tape and method for manufacturing member - Google Patents

Adhesive tape and method for manufacturing member Download PDF

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Publication number
CN105637053B
CN105637053B CN201480055443.9A CN201480055443A CN105637053B CN 105637053 B CN105637053 B CN 105637053B CN 201480055443 A CN201480055443 A CN 201480055443A CN 105637053 B CN105637053 B CN 105637053B
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CN
China
Prior art keywords
release liner
adhesive
adhesive tape
layer
mass
Prior art date
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Active
Application number
CN201480055443.9A
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Chinese (zh)
Other versions
CN105637053A (en
Inventor
秋山诚二
老田健次
加藤直树
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DIC Corp
Original Assignee
Dainippon Ink and Chemicals Co Ltd
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Publication of CN105637053A publication Critical patent/CN105637053A/en
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Publication of CN105637053B publication Critical patent/CN105637053B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/748—Releasability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00—Buildings or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Textile Engineering (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides an adhesive tape which has excellent adhesiveness to foam materials, is not easy to cause tearing of a release liner when the release liner is removed, and does not cause reduction of the sticking operability. The invention relates to an adhesive tape, which is characterized in that both surfaces of a core substrate (A) are provided with adhesive layers (B) formed by aqueous adhesive compositions, a release liner (C) is laminated on the surface of the adhesive layer on one side or both sides of the adhesive layer (B), and the release liner (C) is obtained by chemical pulp and has a unit area weight of 75g/m2～110g/m2The paper of (a) has a polyolefin layer on one or both sides, and has a silicone layer on one or both sides of the polyolefin layer.

Description

Adhesive tape and method for manufacturing member
Technical Field
The present invention relates to an adhesive tape which can be used for fixing a foam material such as an ethylene propylene rubber foam (OP seal) used in various applications including interior materials of automobiles.
Background
Adhesive tapes are generally excellent in adhesion workability and adhesiveness, and therefore are widely used for fixing various members in the field of manufacturing automobiles, electric appliances, and the like.
For example, in the automotive field, the adhesive tape is often used for fixing a foam material such as an ethylene propylene rubber (hereinafter, abbreviated as EPDM) foam, an EPDM sponge, a flexible polyurethane foam, or a polyethylene foam to an automotive part such as a vehicle body, an air conditioning unit, a ceiling, a door trim, or a seat, for the purpose of improving air-tightness, water-tightness, sound absorption, sound insulation, vibration-proof properties, or the like.
However, since the surface of the foam material often has irregularities due to pores, the contact area at the interface between the adhesive tape and the foam material tends to be small, and as a result, the interface may be peeled off with time.
On the other hand, in the formation of the adhesive layer constituting the adhesive tape, conventionally, an organic solvent-based adhesive has been used in many cases. However, in recent years, demands for environmentally compatible products have been increasing, and it has been demanded to provide an adhesive tape having an adhesive layer formed using a water dispersion type adhesive instead of the organic solvent type adhesive.
As the water-dispersed adhesive, the following adhesive sheets are known: for example, the adhesive sheet is an adhesive sheet provided with an adhesive layer formed from an aqueous adhesive composition which is a dispersion liquid containing an aqueous solvent and an acrylic polymer dispersed in the aqueous solvent and has a 180 ° peel adhesion of 1.5N/20mm or more when pressure-bonded to a predetermined flexible polyurethane foam under predetermined conditions (for example, see patent document 1.).
However, since an adhesive tape formed using the water-dispersible adhesive generally tends to have a lower adhesive force than an adhesive tape formed using an organic solvent-based adhesive, the adhesive tape may have a practically insufficient adhesiveness to an EPDM foam having a larger uneven structure than a soft polyurethane foam.
In addition, as a method for fixing the foam material or the like to another adherend using the adhesive tape, generally, the following method is often employed: a member obtained by previously attaching a foam material or the like to one adhesive layer of the adhesive tape is prepared, 1 or 2 or more of the members are stacked, cut into a predetermined shape by a punching method or the like, and then the release liner is removed from the surface of the other adhesive layer and attached to a predetermined position of another adherend.
However, if the cut shape is a shape having a cut at an acute angle, the release liner is easily torn when the release liner is removed, and as a result, the sticking workability may be significantly reduced.
Documents of the prior art
Patent document
Patent document 1 Japanese patent laid-open No. 2012 and 97234
Disclosure of Invention
Problems to be solved by the invention
The present invention addresses the problem of providing an adhesive tape that has excellent adhesion to a foam material as an adherend, that is less likely to cause tearing of a release liner when the release liner is removed from an adhesive layer, and that does not cause a reduction in adhesion workability, and that has an adhesive layer formed from an aqueous adhesive composition.
Means for solving the problems
The present inventors have studied on an adhesive tape having an adhesive layer formed using an aqueous adhesive composition for fixing a foam material, and have found that the above-mentioned problems can be solved when the adhesive tape is combined with a specific release liner.
That is, the present invention relates to an adhesive tape characterized by having a core base material (A) on both sidesAn adhesive layer (B) formed by using an aqueous adhesive composition, wherein a release liner (C) is laminated on one or both surfaces of the adhesive layer (B), and the release liner (C) has a weight per unit area of 75g/m containing chemical pulp2～110g/m2The paper of (a) has a polyolefin layer on one or both sides, and has a silicone layer on one or both sides of the polyolefin layer.
ADVANTAGEOUS EFFECTS OF INVENTION
The pressure-sensitive adhesive tape of the present invention can reduce environmental load due to organic solvents and the like, has excellent adhesion to foams having a small contact area, can prevent the release liner from being torn when the release liner is removed, can prevent the adhesion workability of the pressure-sensitive adhesive tape and the like from being deteriorated, and can be suitably used when fixing the foams at predetermined positions in the production of automobiles, electric appliances and the like, for example.
Drawings
Fig. 1 is a cross-sectional view of a test piece 7 obtained by attaching a foam material to one surface of an adhesive tape.
Fig. 2 is a plan view of a test piece 7 obtained by attaching a foam material to one surface of an adhesive tape.
Fig. 3 is a plan view of a test piece 8 obtained by punching a test piece 7 obtained by attaching a foam material to one surface of an adhesive tape.
The adhesive tape of the invention is characterized in that both surfaces of a core substrate (A) are provided with adhesive layers (B) formed by aqueous adhesive compositions, one side or both sides of the adhesive layer (B) are laminated with a release liner (C), and the release liner (C) is arranged on the surface of the release liner (B) and contains 75g/m of the weight of chemical pulp per unit area2～110g/m2The paper of (a) has a polyolefin layer on one or both sides, and has a silicone layer on one or both sides of the polyolefin layer. In particular, the adhesive tape of the present invention can be suitably used for fixing a foam material to other adherend.
(core substrate (A))
The core base material (a) constitutes a support of the adhesive tape of the present invention. The core base material (A) is preferably a core base material having a thickness of 1 to 200 μm, more preferably a core base material having a thickness of 5 to 100 μm, and still more preferably a core base material having a thickness of 5 to 50 μm, in order to prevent the release liner from being torn or the like when the release liner is removed from the adhesive layer and to prevent the adhesion workability from being lowered.
As the core base material (a) constituting the adhesive tape of the present invention, for example, a nonwoven fabric, a resin film, a foam, and the like can be used. Among these, the core base material (a) is preferably a nonwoven fabric in order to prevent the release liner from being easily torn off when the release liner is removed from the adhesive layer and to prevent the adhesion workability from being lowered.
As the nonwoven fabric, for example, a material formed of fibers such as rayon, pulp, manila hemp, nylon, polyester, polypropylene, and polyvinyl alcohol can be used. Among these, in order to further improve the adhesion to the adhesive layer (B), it is preferable to use a nonwoven fabric formed by using fibers obtained by mixing 1 or 2 or more selected from the group consisting of rayon, pulp, and manila hemp, more preferably a nonwoven fabric formed by using fibers obtained by mixing 1 or 2 or more selected from the group consisting of rayon and pulp, and still more preferably a nonwoven fabric formed by using fibers obtained by mixing rayon and pulp.
In order to further improve the adhesion to the adhesive layer (B), the mixing ratio of the rayon and the pulp is preferably in the range of 2/8 to 8/2 rayon/pulp (mass ratio).
As the nonwoven fabric, a nonwoven fabric subjected to a viscose impregnation treatment, an impregnation treatment with a thermoplastic resin or the like, and a surface treatment may be used as necessary.
As the nonwoven fabric, it is preferable to use a nonwoven fabric having a weight per unit area of 5g/m2～25g/m2The nonwoven fabric of (4) is preferably used in an amount of 8g/m in order to further improve the adhesion to the adhesive agent layer (B)2～16g/m2The nonwoven fabric of (1).
The nonwoven fabric is preferably a nonwoven fabric having a thickness of 20 to 80 μm, and more preferably a nonwoven fabric having a thickness of 30 to 50 μm for further improving the adhesion to the adhesive layer (B).
As the resin film that can be used for the core base material (a), for example, a film formed using polyethylene terephthalate (hereinafter, PET), triacetyl cellulose, polyacrylate, cellophane, polyethylene, polypropylene, polyvinyl alcohol, polycarbonate, nylon, polysulfone, polystyrene, polyimide, aromatic polyimide, or the like can be used. Among these, a PET film is preferably used as the resin film in order to obtain an inexpensive adhesive tape having high strength and excellent insulation properties.
As the resin film, a resin film subjected to an easy adhesion treatment is preferably used for the purpose of further improving the adhesion to the adhesive agent layer (B). Examples of the easy adhesion treatment method include a method of forming an undercoat layer by applying an undercoat agent containing a polyester resin, an acrylic resin, or the like, by a surface roughening treatment method such as a sand blasting method or a solvent treatment method, a surface oxidation treatment method such as a corona discharge treatment method, a chromic acid treatment method, a flame treatment method, a hot air treatment method, or an ozone/ultraviolet irradiation treatment method.
Specific examples of the PET Film subjected to the above-mentioned easy adhesion treatment include "EMBLT SG" manufactured by Unico, TEIJIN Tetoron Film G2 "manufactured by Digital, LUMIRROR S105" manufactured by Toray, and "T100E" manufactured by Mitsubishi chemical polyester Film.
The resin film is preferably a resin film having a thickness of 2 to 188 μm, more preferably 2 to 100 μm, even more preferably 2 to 50 μm, and even more preferably 2 to 25 μm in order to further improve the adhesiveness to the foam. In addition, as the resin film, in order to improve the workability in manufacturing the adhesive tape, it is particularly preferable to use a resin film of 6 to 25 μm.
(adhesive agent layer (B))
The adhesive layer (B) constituting the adhesive tape of the present invention is a layer formed using an aqueous adhesive composition. The adhesive layer (B) is laminated on both surfaces of the core base material (A).
Since the release liner is easily removed from the adhesive tape and the adhesion workability of the adhesive tape can be further improved, the following adhesive layer is preferably used as the adhesive layer (B): the 180-degree peel adhesion to a foam material as an adherend is higher than the peel load to a release liner (C) described later.
For example, when the adhesive layer (B) is an EPDM foam having a large surface unevenness and poor adhesiveness, the following adhesive layer is preferably used as the foam material: the 180 degree peel adhesion to foam is high compared to the peel load to the release liner (C).
In addition, when the 180-degree peel adhesion of the adhesive agent layer (B) was objectively compared, the following materials were used: for example, the adhesive tape of the present invention is obtained by applying a foam material (product name: Rusela SE or EPDM foam) having a thickness of 10mm to the adhesive layer (B1) while compressing the foam material so that the thickness of the foam material becomes 5mm, to the adhesive layer (B2) constituting One side of the adhesive tape of the present invention, using a PET film having a thickness of 25 μm as a backing, and peeling the adhesive tape 180 degrees, the adhesive strength is preferably 1.0N/20mm or more, more preferably 1.3N/20mm to 6N/20mm, still more preferably 1.4N/20mm to 6N/20mm, and particularly preferably 1.5N/20mm to 6N/20 mm.
The adhesive layer (B) is preferably an adhesive layer having a thickness of 15 to 80 μm, more preferably an adhesive layer having a thickness of 25 to 80 μm, and is more preferably an adhesive layer having a thickness of 45 to 80 μm because the adhesiveness to a foam material is further improved and the adhesive layer can provide excellent adhesiveness to a curved surface portion of an adherend.
In addition, as the adhesive agent layer (B), the total thickness (total thickness) of the adhesive agent layers (B) provided on both surfaces of the core base material (a) is preferably 30 μm to 160 μm, more preferably 50 μm to 160 μm, and is more preferably 90 μm to 160 μm because adhesiveness to a foam is further improved and excellent adhesiveness can be provided also to a curved surface portion of an adherend.
In the adhesive agent layer (B), the gel fraction measured as an insoluble component after the adhesive agent layer (B) is immersed in toluene for 24 hours is preferably 20 to 45 mass%, more preferably 25 to 40 mass%, and is more preferably 30 to 40 mass% because the adhesiveness to a foam material is further improved and the adhesive property to a curved surface portion of an adherend can be further improved.
As the adhesive agent layer (B), an adhesive agent layer formed by using an aqueous adhesive composition can be used.
As the aqueous adhesive composition, for example, an aqueous adhesive composition containing various polymers, an aqueous medium, an adhesion-imparting resin as needed, and a crosslinking agent can be used.
As the polymer, for example, an acrylic polymer, a rubber polymer, a silicone polymer, a polyurethane polymer, or the like can be used. Among them, acrylic polymers are preferably used in order to exhibit excellent adhesiveness and the like.
As the acrylic polymer, a polymer obtained by polymerizing a vinyl monomer-containing monomer component such as a (meth) acrylic monomer can be used.
As the vinyl monomer, for example, (meth) acrylate having an alkyl group having 4 to 8 carbon atoms, a vinyl monomer having a carboxyl group, a vinyl monomer having a nitrogen atom, and the like are preferably used.
Examples of the alkyl (meth) acrylate having an alkyl group of 4 to 8 carbon atoms include (meth) acrylates such as 2-ethylhexyl acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, isooctyl (meth) acrylate, and n-octyl (meth) acrylate. Among these, (meth) acrylic acid esters having an alkyl group having 4 to 8 carbon atoms are preferably 2-ethylhexyl acrylate and n-butyl acrylate, and 2-ethylhexyl acrylate is preferably used in order to further improve the adhesiveness to the foam, and since the adhesiveness to the foam is further improved and excellent adhesiveness can be provided also to the curved surface portion of the adherend, it is more preferable to use 2-ethylhexyl acrylate and n-butyl acrylate in combination.
The alkyl (meth) acrylate having an alkyl group having 4 to 8 carbon atoms is preferably used in a range of 50 to 99 mass%, more preferably 70 to 98 mass%, based on the total amount of monomer components used in the production of the acrylic polymer.
The vinyl monomer having a carboxyl group is preferably used in order to impart good water dispersion stability to the acrylic polymer. In addition, when a crosslinking agent described later is used, the vinyl monomer having a carboxyl group can be a crosslinking point with such a crosslinking agent to provide a further high cohesive force to the adhesive layer (B), and is preferably used in order to provide excellent adhesiveness to a curved surface portion of an adherend, and the like.
As the vinyl monomer having a carboxyl group, for example, acrylic acid, methacrylic acid, itaconic acid, maleic anhydride, phthalic acid, phthalic anhydride, crotonic acid, and the like can be used. Among these, acrylic acid and methacrylic acid are preferably used as the vinyl monomer having a carboxyl group, and in order to further improve the adhesiveness to the foam, acrylic acid and methacrylic acid are more preferably used in combination.
The vinyl monomer having a carboxyl group is preferably used in a range of 0.5 to 5.0% by mass, more preferably 1 to 4.0% by mass, based on the total amount of the monomer components used for producing the acrylic polymer, and further preferably 1.5 to 3.0% by mass in order to further improve the adhesiveness to the foam.
As the vinyl monomer having a nitrogen atom, there can be used, for example, N-vinylpyrrolidone, N-vinylpiperidone, N-vinylmorpholinone, N-vinylcaprolactam, N-cyclohexylmaleimide, N-butylmaleimide, N-phenylmaleimide, N- (meth) acryloylmorpholine, N- (meth) acryloylpyrrolidone, N- (meth) acryloylpiperidine, N- (meth) acryloylpyrrolidine, N- (meth) acryloyl4-piperidone, acrylonitrile, (meth) acrylamide, N-dimethyl (meth) acrylamide, N-diethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxypiperidine, N-cyclohexylmaleimide, N-butylmaleimide, N-phenylmaleimide, N- (meth) acryloylmorpholine, N- (meth) acryloylpyrrolidone, N- (meth) acryloylpiperidine, N- (meth) acryloyl, N-butoxymethyl (meth) acrylamide, N-methylenebis (meth) acrylamide, N-isopropyl (meth) acrylamide, N-dimethylaminopropyl (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, tert-butylaminoethyl (meth) acrylate, and the like, and N-vinylpyrrolidone and N-isopropyl (meth) acrylamide are preferably used.
The vinyl monomer having a nitrogen atom is more preferably used in combination with the vinyl monomer having a carboxyl group because it can impart a high cohesive force to the adhesive layer (B), and as a result, it can impart further excellent adhesiveness to a curved surface portion of an adherend, and also form an adhesive layer (B) capable of maintaining excellent adhesiveness for a long period of time even in a high-temperature environment.
The vinyl monomer having a nitrogen atom is preferably used in a range of 0.1 to 5.0% by mass, more preferably 0.5 to 4.0% by mass, based on the total amount of the monomer components used for producing the acrylic polymer, and is more preferably used in a range of 0.5 to 3.0% by mass, since it is possible to impart further excellent adhesiveness to a curved surface portion of an adherend and the like and maintain excellent adhesiveness for a long period of time even under a high-temperature environment.
As the monomer component used in the production of the acrylic polymer, other monomers may be used as necessary in addition to the above-mentioned components.
As the other monomer, for example, (meth) acrylate having an alkyl group having 1 to 3 carbon atoms can be used.
Examples of the alkyl (meth) acrylate having an alkyl group of 1 to 3 carbon atoms include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, and isopropyl (meth) acrylate. Among these, as the alkyl (meth) acrylate having an alkyl group having 1 to 3 carbon atoms, for example, methyl (meth) acrylate and ethyl (meth) acrylate are preferably used.
The alkyl (meth) acrylate having an alkyl group with 1 to 3 carbon atoms is more preferably used in combination with the alkyl (meth) acrylate having an alkyl group with 4 to 8 carbon atoms, because the adhesion to the foam is further improved and excellent adhesion can be provided also to the curved surface portion of the adherend.
The alkyl (meth) acrylate having an alkyl group with 1 to 3 carbon atoms is preferably used in a range of 1 to 20 mass%, more preferably 1 to 10 mass%, based on the total amount of monomer components used in the production of the acrylic polymer.
Examples of the other monomers include a vinyl monomer having a hydroxyl group such as 4-hydroxybutyl (meth) acrylate, a vinyl monomer having a ketone group (or aldehyde group) such as diacetone acrylamide, a silane-based vinyl monomer such as 3-methacryloxypropylmethyldimethoxysilane, and a vinyl monomer having a phosphoric acid group such as SIPOMER PAM-100 (manufactured by Rhodia Rihua Co., Ltd.).
The acrylic polymer can be produced by polymerizing the monomer component by, for example, emulsion polymerization.
When the acrylic polymer is produced, an anionic emulsifier or a nonionic emulsifier can be suitably used as needed.
As the emulsifier, an emulsifier having a polymerizable unsaturated group in the molecule, which is known as a "reactive emulsifier", is preferably used in order to improve the water resistance and moisture resistance of the adhesive agent layer (B).
Specific examples of the reactive emulsifier include LATEMUL PD-104 (manufactured by Kao corporation), Aqualon KH-1025 (manufactured by first Industrial pharmaceutical Co., Ltd.), ADEKA REASOAP SE-10 (manufactured by ADEKA Co., Ltd.), and the like, and a combination of LATEMUL PD-104 and Aqualon KH-1025 is particularly preferable because further improvement of polymerization stability and improvement of water resistance and moisture resistance can be achieved.
In the production of the acrylic polymer by emulsion polymerization, a polymerization initiator may be used.
Examples of the polymerization initiator include azo initiators, persulfate initiators, peroxide initiators, carbonyl initiators, and redox initiators such as a combination of a persulfate and sodium hydrogen sulfite.
Among them, as the polymerization initiator, a persulfate initiator and an azo initiator are preferably used.
The adhesive layer (B) containing an acrylic polymer obtained by the emulsion polymerization method using a persulfate initiator and an azo initiator exhibits further excellent adhesion to a foam material.
As the persulfate initiator, for example, potassium persulfate, ammonium persulfate and the like are preferably used. Further, as the azo initiator, 2,2 ' -azobis (2-methylpropionamidine) dihydrochloride, 2,2 ' -azobis (2-methylpropionamidine) disulfate, 2,2 ' -azobis (2-propionamidine) dihydrochloride, 2,2 ' -azobis (N- (2-carboxyethyl) -2-methylpropionamidine) hydrate, 2,2 ' -azobis (N, N ' -dimethyleneisobutylamidine) dihydrochloride, 2,2 ' -azobis (2- (2-imidazolin-2-yl) propane) dihydrochloride, and the like are mentioned.
In the production of the acrylic polymer, a chain transfer agent may be used for the purpose of adjusting the molecular weight thereof. Examples of the chain transfer agent include lauryl mercaptan, glycidyl mercaptan, thioglycolic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, and 2, 3-dimercapto-1-propanol.
The acrylic polymer obtained by the above method is preferably an acrylic polymer having a glass transition temperature of-70 ℃ to-50 ℃, more preferably an acrylic polymer having a glass transition temperature of-65 ℃ to-54 ℃, and further preferably an acrylic polymer having a glass transition temperature of-62 ℃ to-57 ℃ for providing a foam with further excellent adhesiveness. The glass transition temperature (Tg) is a value calculated from the formula of FOX, based on the glass transition temperature of a homopolymer of a monomer component used in the production of an acrylic polymer and the mass fraction of the monomer. As the glass transition temperature of the homopolymer, values described in known data can be used, for example, -54 ℃ for N-butyl acrylate, -70 ℃ for 2-ethylhexyl acrylate, -105 ℃ for methyl methacrylate, -80 ℃ for N-vinylpyrrolidone, -106 ℃ for acrylic acid and 228 ℃ for methacrylic acid.
The weight average molecular weight of the acrylic polymer is preferably in the range of 30 to 120 ten thousand, more preferably in the range of 40 to 100 ten thousand, and further preferably in the range of 45 to 80 ten thousand in order to exhibit further excellent adhesiveness to a foam.
The weight average molecular weight is obtained by Gel Permeation Chromatography (GPC) in terms of standard polystyrene. As the measurement conditions, TSKgel GMHXL (manufactured by Tosoh) was used for the column, the column temperature was 40 ℃, the eluent was tetrahydrofuran, and the flow rate was 1.0 mL/min, and the standard polystyrene was the value obtained by using TSK standard polystyrene.
The acrylic polymer obtained by the above method is preferably dispersible in an aqueous medium. The average particle diameter of the acrylic polymer particles is not particularly limited, but is preferably in the range of 100nm to 500 nm. The average particle diameter is a 50% median particle diameter in terms of a volume standard of the acrylic polymer particles, and the numerical value is a numerical value based on a value measured by a dynamic light scattering method.
As the aqueous medium in which the acrylic polymer can be dispersed or dissolved, water may be used alone or a mixed solvent of water and a water-soluble solvent may be used.
As the aqueous adhesive composition forming the adhesive agent layer (B), an aqueous dispersion of an acrylic polymer obtained by the emulsion polymerization method or the like can be used. The aqueous pressure-sensitive adhesive composition may be produced by mixing a previously produced acrylic polymer with an aqueous medium, or the like.
As the aqueous adhesive composition forming the adhesive agent layer (B), an aqueous adhesive composition containing the acrylic polymer in a range of 70 to 95% by mass relative to the total amount of the aqueous adhesive composition is preferably used.
In the acrylic polymer, the insoluble content relative to toluene, that is, the gel fraction, is preferably 0 to 20% by mass, more preferably 0 to 10% by mass, even more preferably 0 to 5% by mass, and particularly preferably 0 to 1% by mass in order to further improve the adhesiveness to the foam.
As the aqueous adhesive composition forming the adhesive layer (B), an aqueous adhesive composition containing an adhesion-imparting resin may be used as needed.
As the adhesion-imparting resin, an emulsion-type adhesion-imparting resin is preferably used.
Examples of the emulsion-type tackiness imparting resin include a rosin-based tackiness imparting resin, a polymerized rosin-based tackiness imparting resin, a rosin phenol-based tackiness imparting resin, a hydrogenated rosin ester-based tackiness imparting resin, a disproportionated rosin ester-based tackiness imparting resin, a terpene phenol-based tackiness imparting resin, and an aliphatic (petroleum resin) -based tackiness imparting resin. Among them, as the adhesion-imparting resin, in order to further improve excellent adhesion to a foam material, a polymerized rosin-based adhesion-imparting resin, a polymerized rosin ester-based adhesion-imparting resin, a rosin phenol-based adhesion-imparting resin, or a terpene phenol-based adhesion-imparting resin is preferably used. Further, it is preferable to use a polymerized rosin ester-based tackiness imparting resin and a rosin phenol-based tackiness imparting resin in combination because the adhesiveness to the foam can be further improved and the excellent adhesiveness can be imparted to the curved surface portion of the adherend.
Specific examples of the polymerized rosin ESTER adhesion-imparting resin include SUPER ESTER E-625NT (manufactured by KANTIAN CHEMICAL INDUSTRIAL CO., LTD.), SUPER ESTER E-650 (manufactured by KANTIAN CHEMICAL INDUSTRIAL CO., LTD.), SUPER ESTER E-788 (manufactured by KANTIAN CHEMICAL INDUSTRIAL CO., LTD.), SUPER ESTER E-865 (manufactured by KANTIAN CHEMICAL INDUSTRIAL CO., LTD.), HARIESTER SK-508 (manufactured by KANTIAN CHEMICAL INDUSTRIAL CO., LTD.), HARIESTER SK-508H (manufactured by KANTIAN CHEMICAL INDUSTRIAL CO., LTD.), HARIESTER SK-816E (manufactured by KANTIAN CHEMICAL CO., LTD.), HARIESTER SK-822-E (manufactured by KANTIAN CHEMICAL CO., LTD.), HARIESTER SK-218 (manufactured by NASS CO., LTD), and MT 29-218 (manufactured by NASS, strain 4625-59S) (manufactured by NASS CO., LTD) Manufactured), and the like.
Specific examples of the rosin phenol-based tackiness imparting resin include TAMANOL E-100 (manufactured by KANTIANHUA CHEMICAL INDUSTRIAL CO., LTD.), TAMANOL E-200NT (manufactured by KANTIANHUA CHEMICAL CO., LTD.).
As the adhesion-imparting resin, in order to further reduce the amount of the organic solvent that may be contained in the adhesive agent layer (B) and the aqueous adhesive composition, it is preferable to use an adhesion-imparting resin produced without using an aromatic organic solvent. Specific examples of the adhesion-imparting resin not containing an aromatic organic solvent include SUPER ESTER E-625NT, SUPER ESTER E-865NT, TAMANOL E-200NT, HARIESTER SK-218NS, HARIESTER SK-218MT, HARIESTER SK-323NS, and the like.
The softening point of the adhesion-imparting resin is suitably 120 to 180 ℃, more preferably 140 to 180 ℃. The addition of the adhesion imparting resin having a high softening point is more preferable because it can impart further excellent adhesion to a curved surface portion of an adherend and the like and can maintain excellent adhesion for a long period of time even in a high-temperature environment.
The content of the adhesion-imparting resin is preferably 5 to 40 parts by mass, more preferably 10 to 35 parts by mass, based on 100 parts by mass of the acrylic polymer, and is more preferably 20 to 30 parts by mass because it can impart further excellent adhesion to the foam material and can impart further excellent adhesion to a curved surface portion of an adherend, and the like.
As the aqueous adhesive composition that can be used for forming the adhesive agent layer (B), an aqueous adhesive composition containing a crosslinking agent can be used in order to further increase the cohesive force of the adhesive agent layer (B).
As the crosslinking agent, known isocyanates, epoxy compounds, aziridine compounds, polyvalent metal salts, metal chelates, ketone hydrazine compounds, amine compounds,oxazoline compounds, silane compounds, glycidyl (alkoxy) epoxy silane compounds, and the like.
Among these, as the crosslinking agent, an epoxy compound is preferably used in order to further improve excellent adhesiveness to a foam material.
Specific examples of the epoxy compound include Denacol EX-832 (tradename, tradename.
The crosslinking agent may be used in a range in which the gel fraction of the adhesive agent layer (B) is in a desired range. For example, when an epoxy compound is used as the crosslinking agent, the epoxy compound is preferably used in a range of 0.01 to 0.1 parts by mass per 100 parts by mass of the acrylic polymer.
In the aqueous adhesive composition for forming the adhesive agent layer (B), other additives may be contained within a range not inhibiting the above-mentioned effects.
As other additives, plasticizers, softeners, antioxidants, fillers such as glass or plastic fibers, spheres, beads, and metal powders, colorants such as pigments and dyes, pH adjusters, film formation aids, leveling agents, thickeners, water repellents, and defoaming agents can be used.
(Release liner (C))
As the release liner (C) constituting the adhesive tape of the present invention, the following release liners were usedDie cushion: weight per unit area of 75g/m obtained by using chemical pulp2～110g/m2The paper of (a) has a polyolefin layer on one or both sides, and has a silicone layer on one or both sides of the polyolefin layer.
As the paper, paper obtained using a material generally called chemical pulp obtained by chemically treating wood chips with sulfate, sulfite, or the like is used.
As the chemical pulp, for example, kraft pulp, sulfide pulp, alkaline pulp, and the like can be used, and preferably kraft pulp and sulfide pulp are used, and more preferably sulfide pulp is used.
Among these, so-called dow paper having a blend ratio of sulfide pulp of 100 mass% is preferably used as the paper, and it is preferable to use dow paper containing softwood bleached kraft pulp (N material) and hardwood bleached kraft pulp (L material) because the release liner is less likely to be torn when the release liner is removed from the surface of the adhesive agent layer (B) in the sulfide pulp. The ratio of the softwood bleached kraft pulp (N material) to the hardwood bleached kraft pulp (L material) is not particularly limited, and the ratio of the N material to the L material can be appropriately adjusted according to the handling properties in the production process and the use process of the adhesive tape.
As the paper constituting the release liner (C), the paper obtained from the chemical pulp was used in an amount of 75g/m in basis weight2～110g/m2A range of (1). Among these, it is particularly preferable to use 75g/m as the paper in order to obtain a release liner (C) which exhibits a desired effect without impairing the workability in the production of the release liner (C)2～85g/m2A range of (1).
The paper constituting the release liner (C) may contain an internal-type wet paper strength agent, a dry paper strength agent, and a surface-type paper strength agent. More preferably, the paper strength enhancing agent of the internal addition type and the paper strength enhancing agent of the surface type are used, and still more preferably, both of them are used in combination. Examples of the internal-addition type paper strength dry strengthening agent include cationized starch and polyacrylamide polymer. Examples of the surface-type paper strength agent include modified starch and polyvinyl alcohol.
As the paper, paper containing a sizing agent, a retention aid, a drainage aid, an antifoaming agent, a dispersant, a bleaching agent, a dye, and the like can be used.
The method for making the paper is not particularly limited, and examples thereof include a method using a cylinder machine, a short wire machine, a fourdrinier machine, and the like.
As the release liner (C), one having a polyolefin layer on one or both sides of the paper is used. The polyolefin layer is preferably a layer formed using polyethylene because it has high adhesion to paper and is difficult to tear when the release liner is removed from the surface of the adhesive layer (B).
Further, the polyolefin layer is preferably a polyolefin layer having a thickness in the range of 10 to 40 μm, more preferably a polyolefin layer having a thickness in the range of 20 to 30 μm, and is preferably a polyolefin layer having a thickness in the range of 23 to 27 μm because of high adhesion to the paper and difficulty in tearing when removing the release liner from the surface of the adhesive layer (B).
The polyolefin layer may be formed as follows: for example, polyethylene is applied to one or both surfaces of the paper by a T-die extruder, and the surface is smoothed by a laminator or the like.
As the release liner (C), the following release liner was used: the paper has a polyolefin layer on one or both surfaces thereof, and an organic silicon layer on the outer surface of the polyolefin layer. The silicone layer may be formed as follows: for example, a silicone release agent is applied to the surface of the polyolefin layer, dried, and then cured.
The silicone-based release agent is preferably an addition reaction type, condensation reaction type or UV curing type in order to impart the predetermined peeling load, and among these, an addition reaction type silicone-based release agent is more preferably used because the release liner (C) is less likely to tear and can maintain its easy peelability even when the release liner (C) is peeled from the surface of the adhesive layer (B) at a high speed.
As the addition reaction type silicone-based release agent, KS-847T (manufactured BY shin-Etsu chemical industry Co., Ltd.), KS-774 (manufactured BY shin-Etsu chemical industry Co., Ltd.), KS-776A (manufactured BY shin-Etsu chemical industry Co., Ltd.), KS-778 (manufactured BY shin-Etsu chemical industry Co., Ltd.), KS-779H (manufactured BY shin-Etsu chemical industry Co., Ltd.), KS-830 (manufactured BY shin-Etsu chemical industry Co., Ltd.), KS-837 (manufactured BY shin-Etsu chemical industry Co., Ltd.), KS-839L (manufactured BY shin-Etsu chemical industry Co., Ltd.), KS-3502 (manufactured BY shin-Etsu chemical industry Co., Ltd.), KS-3703 (manufactured BY shin-Etsu chemical industry Co., Ltd.), SRX357 (manufactured BY Dongli-kangning (Co., Ltd.), BY23-749 (manufactured BY Dongli-kangning (manufactured BY Tokyo-kangning Co., Ltd.), SD 33 (manufactured BY Dongli-kangning) (manufactured BY Tokyo-7332-24-179 (manufactured BY Ton, SRX211 (manufactured BY dongli daokang corporation), BY23-746 (manufactured BY dongli daokang corporation), SRX345 (manufactured BY dongli daokang corporation), BY24-4103 (manufactured BY dongli daokang corporation), SD7320 (manufactured BY dongli daokang corporation), SD7236 (manufactured BY dongli daokang corporation), and the like.
Among these, as the addition reaction type silicone-based release agent, KS-847T (manufactured by shin-Etsu chemical industries, Ltd.), SD7333 (manufactured by Toronto Corning Co., Ltd.), and SRX345 (manufactured by Toronto Corning Co., Ltd.) are preferably used because the release liner (C) is less likely to be torn even when the release liner (C) is peeled from the adhesive layer (B) at a speed of 20 m/min, and can be peeled with a weak force.
The silicone layer preferably contains a catalyst in addition to the silicone release agent, and particularly preferably contains the silicone release agent and a platinum-based catalyst because the silicone release agent can be prevented from transferring to the adhesive layer (B) in an amount when the release liner (C) is released from the adhesive layer (B).
As the catalyst, a platinum-based catalyst can be suitably used, and examples thereof include SRX212 (manufactured by Toronto Corning Co., Ltd.), NC-25 (manufactured by Toronto Corning Co., Ltd.), CAT-PL-50T (manufactured by shin-Etsu chemical Co., Ltd.), and the like.
The silicone layer may further contain a heavy release additive as necessary in order to appropriately adjust the release load.
As the heavy release additive, KS-3800 (manufactured BY shin & Shih chemical industries, Ltd.), SD7292 (manufactured BY Toronto Kangning Co., Ltd.), BY24-843 (manufactured BY Toronto Kangning Co., Ltd.), BY24-4980 (manufactured BY Toronto Kangning Co., Ltd.) and the like can be used.
Examples of a method for forming the organic silicon layer include the following methods: the silicone-based release agent or a substance obtained by diluting the release agent in an organic solvent such as toluene is applied to the surface of the polyolefin layer using a direct gravure coater, a lithographic gravure coater, a meyer bar coater (マ イ ヤ ー バ ー コ ー タ ー), a 5-roll coater, or the like, and dried. The drying is preferably performed at 90 to 110 ℃ for 3 to 40 seconds to cause a curing reaction. After the curing, the curing is preferably carried out at 30 to 60 ℃ for 48 hours or more.
The amount of the silicone release agent applied is preferably 0.5g/m in order to adjust the peeling load to the appropriate range2～1.0g/m2Within the range of (1). In order to appropriately adjust the coating amount, the silicone release agent may be diluted with an organic solvent such as toluene. In order to adjust the amount of the solution to be applied to a predetermined range when preparing a diluted solution, the nonvolatile content is preferably in the range of 1 to 10% by mass.
As the release liner (C), the following release liner is preferably used: the tensile strength when the release liner (C) is stretched at a speed of 20 m/min in the flow direction is 35N/5mm or more and the tensile strength when the release liner (C) is stretched at a speed of 20 m/min in the width direction is 35N/5mm or more. Among these, it is more preferable that the release liner (C) has a tensile strength in the flow direction of 45N/5mm or more and a tensile strength in the width direction of 35N/5mm or more, and it is further preferable that the release liner (C) has a tensile strength in the flow direction of 45N/5mm or more and a tensile strength in the width direction of 40N/5mm or more, and that the release liner (C) has a tensile strength in the flow direction of 55N/5mm or more and a tensile strength in the width direction of 45N/5mm or more, because it is possible to prevent the release liner from being torn when the release liner is peeled from the adhesive layer (B), and as a result, it is possible to prevent a reduction in the handling efficiency when the adhesive tape is attached to an adherend such as a foam material, and it is particularly preferable. Further, the upper limit of the tensile strength in both the flow direction and the width direction of the release liner (C) is preferably 125N/5 mm.
As the release liner (C), the following release liner is preferably used: the release liner (C) has a stiffness/softness ratio of 1,000mg or more as measured in a flow direction by a Gurley type testing machine in accordance with JIS L1085 standard, and a stiffness/softness ratio of 1,000mg or more as measured in a width direction of the release liner (C). Among these, it is more preferable that the rigidity and softness in the flow direction of the release liner (C) are 2,000mg or more and the rigidity and softness in the width direction are preferably 1,000mg or more, it is further preferable that the rigidity and softness in the flow direction are 2,000mg or more and the rigidity and softness in the width direction are 1,200mg or more, it is further preferable that the rigidity and softness in the flow direction are 2,000mg or more and the rigidity and softness in the width direction are 1,300mg or more, and it is further preferable that the rigidity and softness in the flow direction are 2,000mg or more and the rigidity and softness in the width direction are 2,000mg or more, since the release liner can be prevented from being torn when the release liner is peeled from the adhesive layer (B), and as a result, the reduction in the handling efficiency when an adherend such as an adhesive tape foam material is adhered can be prevented, and therefore, it is particularly preferable.
Further, as the release liner (C), a release liner having a tear strength of 0.5N to 2N is preferably used. The tear strength here is based on the strength at 0.2 m/min after the center of the end of the release liner (C) was cut into a cut with scissors.
Further, in the case of using a release liner having a peeling load of 1N/20mm or less when the release liner (C) is peeled from the adhesive layer (B) at 180 degrees at 5 m/min, the release liner is preferably 0.01N/20mm to 0.5N/20mm, more preferably 0.01N/20mm to 0.4N/20mm, particularly preferably 0.1N/20mm to 0.3N/20mm, and particularly preferably 0.12N/20mm to 0.22N/20mm, because tearing of the release liner can be prevented when the release liner is peeled, and as a result, reduction in handling efficiency when the double-sided adhesive tape is attached to an adherend such as a foam material can be prevented.
Further, in the case of using a release liner having a peeling load of 1N/20mm or less when the release liner (C) is peeled from the adhesive layer (B) at 180 degrees at 20 m/min, the release liner is preferably 0.01N/20mm to 0.7N/20mm, more preferably 0.01N/20mm to 0.5N/20mm, particularly preferably 0.1N/20mm to 0.4N/20mm, and particularly preferably 0.1N/20mm to 0.2N/20mm, because tearing of the release liner can be prevented when the release liner is peeled, and as a result, reduction in the handling efficiency when the double-sided adhesive tape is attached to an adherend such as a foam material can be prevented.
Further, in the case of using, as the release liner (C), a release liner in which a peeling load is not easily increased even if a peeling speed is increased, that is, a release liner having a small speed dependency, since the release liner can be prevented from being torn when the release liner (C) is quickly peeled off, and as a result, a reduction in the operation efficiency when the double-sided adhesive tape is stuck to an adherend such as a foam can be prevented, it is preferable that a peeling load (R) when the release liner (C) is peeled off from the adhesive layer (B) at 180 degrees at 20 m/min20m) A peeling load (R) when the release liner (C) is peeled from the adhesive layer (B) in a 180-degree direction at 5 m/min5m) Ratio of (R)20m/R5m) Preferably 1 to 3, more preferably 1 to 2.5, still more preferably 1 to 2, and particularly preferably 1.1 to 1.5.
The release liner (C) is particularly preferable because the adhesive layer having a thickness of 90 μm formed by "SK Dyne 801B" (solvent-based adhesive manufactured by Soken chemical Co., Ltd.) preferably has a peeling load of 0.5N/20mm or less, more preferably 0.3N/20mm or less, even more preferably 0.25N/20mm or less, and in the case of 0.16N/20mm or less, the release liner (C) is easily peeled off and the working efficiency is improved. The peeling load was based on the strength when "SK Dyne 801B" (solvent-based adhesive, manufactured by Soken chemical Co., Ltd.) was applied to a release liner (C) so that the thickness after drying became 90 μm, a PET film having a thickness of 75 μm was attached to the surface after drying, the resultant test piece was cured at 40 ℃ for 20 hours, and the release liner side of the test piece cut to have a width of 20mm was pinched and peeled in the 180-degree direction.
The release liner (C) is preferably a release liner having a total thickness of 100 to 200 μm, more preferably 120 to 150 μm, and is particularly preferably a release liner having a total thickness of 130 to 140 μm, because handling workability in the production process of the adhesive tape is good, and the release liner (C) is not easily torn and easily peeled off when peeled off.
The adhesive tape of the present invention can be produced by the following method: a method of directly coating the aqueous adhesive composition on one or both sides of the core base material (a) using a roll coater, a die coater or the like; a method in which the aqueous adhesive composition is applied to the surface of the release liner (C) using a roll coater, a die coater, or the like to form an adhesive layer (B), and then the adhesive layer (B) is transferred to one or both surfaces of the core base material (a).
In the adhesive tape of the present invention, in order to allow the crosslinking reaction of the adhesive agent layer (B) to proceed and improve the heat resistance and adhesiveness of the adhesive agent layer, it is preferable to cure the adhesive tape at 20 to 50 ℃ for 48 hours or more after the production by the above-described production method.
The cured adhesive tape is based on the mass (G) of the core base material (A)0) Quality of adhesive tape (G)1) And the mass of a substance obtained by immersing the adhesive tape in toluene at 25 ℃ for 24 hours and then drying the adhesive tape at 105 ℃ (G)2) The calculated gel fraction (formula below) is preferably in the range of 20 to 45 mass%, more preferably in the range of 25 to 40 mass%, and in the case of 30 to 40 mass%, the adhesiveness to the foam is excellent, and the release liner is less likely to be torn, and therefore, it is particularly preferable.
Gel fraction (% by mass) ((G)2-G0)/(G1-G0))×100
The adhesive tape of the present invention is particularly preferably an adhesive tape in which the total thickness of the core base material (a) and the adhesive agent layer (B) is in the range of 80 to 200 μm, and when an adhesive tape in the range of 100 to 160 μm is used, the adhesiveness to a foam material is excellent, and the release liner is less likely to be torn.
The adhesive tape of the present invention has excellent adhesion to a material having a large unevenness in the surface shape, such as a foam. In addition, in the step of attaching the pressure-sensitive adhesive tape to an automobile part or the like after punching the pressure-sensitive adhesive tape into a desired shape in a state of being attached to the foam material, the release liner can be easily peeled off without being torn at the time of peeling the release liner, and therefore, the workability of bonding to a vehicle body, a television housing, or the like is excellent.
As the foam material, a porous body containing closed cells or cells partially communicating with each other can be used, and examples thereof include foams such as urethane foam and EPDM foam. The adhesive tape of the present invention can be suitably used for bonding to a foam whose contact area tends to be small.
Further, the adhesive tape of the present invention can be suitably used as a double-sided adhesive tape for fixing various product interior parts and foam materials in industrial applications such as automobiles, building materials, OA, and home electric appliances, because the effect of reducing volatile organic compounds can be expected by using a water-dispersed acrylic adhesive without using a conventional solution-polymerized acrylic adhesive.
Examples
The present invention will be described in detail with reference to examples and comparative examples. The methods for evaluating the properties of the adhesive tapes obtained in examples and comparative examples are as follows.
(tensile Strength of Release liner)
5 test pieces 1 to which a release liner was cut in a size of 5mm in the flow direction and 180mm in the width direction were prepared.
The tensile strength of the test piece 1 in the width direction was measured by a high speed tensile TESTER (manufactured by TESTER INDUSTRY) under the conditions of a reticle interval of 150mm and a tensile speed of 20 m/min, and the average was performed.
Further, 5 test pieces 2 to which the release liner was cut in a size of 180mm in the flow direction and 5mm in the width direction were prepared.
The tensile strength of the test piece 2 in the width direction was measured by a high speed tensile TESTER (manufactured by TESTER INDUSTRY) under the conditions of a reticle interval of 150mm and a tensile speed of 20 m/min, and the average was performed.
(softness of Release liner)
The rigidity and softness of the release liner were measured in accordance with JIS L1085 standard.
5 test pieces 3 were prepared in which the release liner was cut in a size of 20mm in the flow direction and 340mm in the width direction.
Next, 5 test pieces 3 were stacked and fixed by a jig using a Gurley type rigidity/softness TESTER (model ST-401, manufactured by TESTER INDUSTRY CO., LTD.).
Subsequently, a load of 25g was hung at a position 10cm away from the fixed position (fulcrum), and the scale (RG) when the test piece 3 was separated from the pendulum was read by rotating the arm at a constant speed. The front and back surfaces were measured 5 times, respectively, and the average value was calculated. Based on the measured values, the stiffness was calculated by the following equation.
Formula (II): stiffness (mg) × 10 × 25 × (3.4 × 3.4 ÷ 2) × 0.306
Further, 5 test pieces 4 were prepared by cutting the release liner in the dimension of 340mm in the flow direction and 20mm in the width direction.
Next, 5 test pieces 4 were stacked and fixed by a jig using a Gurley type rigidity and softness TESTER (model: ST-401, manufactured by TESTER INDUSTRIAL CO., LTD.).
Subsequently, a load of 25g was hung at a position 10cm away from the fixed position (fulcrum), and the scale (RG) when the test piece 4 was separated from the pendulum was read by rotating the arm at a constant speed. The average value was calculated by measuring the surface and the inside of each sample 5 times. Based on the measured values, the stiffness was calculated by the following equation.
Formula (II): stiffness (mg) × 10 × 25 × (3.4 × 3.4 ÷ 2) × 0.306
(Release liner peeling load 1(801B method))
The release liner was coated with "SK Dyne 801B" (solvent-based adhesive, available from Soken chemical Co., Ltd.) so that the thickness after drying became 90 μm, and after drying, the liner was bonded to a PET film having a thickness of 75 μm, and the laminate was cured at 40 ℃ for 20 hours and cut into pieces having a width of 20mm, thereby obtaining test pieces 5. The release liner of the test piece 5 was pinched and the peeling load at the time of peeling at a speed of 5 m/min in the 180-degree direction was measured by a high-speed peeling TESTER (manufactured by TESTER INDUSTRIAL CO., LTD.).
(Release liner peeling load 2)
The adhesive tape was cut into a width of 20mm to prepare a test piece 6. The release liner of the test piece 6 was held between two fingers at 23 ℃ and 50% RH, and the peeling load at the time of peeling from the adhesive layer at 180 degrees at 5 m/min and 20 m/min was measured by a high speed peeling TESTER (manufactured by stester industries, ltd.).
(Release liner peeling load 3 (Release liner Manual peeling Adaptation 1))
3 sheets of a material (see FIG. 1) obtained by peeling off a release liner on One surface of an adhesive tape and bonding the release liner to an EPDM foam (product name: Ruselela SE) having a thickness of 10mm were prepared, and 3 sheets were stacked and punched into a square having a vertical length of 60mm and a horizontal length of 60mm to prepare a test piece 7 (see FIG. 2).
The degree of easy peeling when the release liner constituting the other side of the test piece 7 was peeled from 1 corner (point a in fig. 2) of the test piece 7 in the diagonal direction (point B in fig. 2) at a speed of 20 m/min was evaluated. The testers 5 performed 3 times for each test piece, and the most evaluations were performed.
Very good: the release liner did not tear, and the hand peeling could be performed with almost no resistance.
O: although the release liner did not tear, the hand performing the peeling felt a certain degree of resistance but was able to peel.
And (delta): the release liner was torn 1 or 2 times.
X: the release liner was torn in all 3 passes.
(Release liner peeling load 4 (Release liner Manual peeling Adaptation 2))
3 sheets of a material obtained by peeling off a release liner on One surface of an adhesive tape and bonding the same to an EPDM foam (product name: Rusela SE) having a thickness of 10mm were prepared, and 3 sheets were stacked and subjected to a punching process to have a shape shown in FIG. 3, thereby obtaining a test piece 8.
The degree of easy peeling when the release liner constituting the other side of the test piece 8 was peeled from 1 corner (point a in fig. 3) of the test piece 8 in the diagonal direction (point B in fig. 3) at a speed of 20 m/min was evaluated. The testers 5 performed 3 times for each test piece, and the most evaluations were performed.
Very good: the release liner did not tear and could be peeled with light force.
O: the release liner did not tear and was able to peel off, though somewhat heavier felt.
And (delta): the release liner was torn 1 or 2 times.
X: the release liner was torn in all 3 passes.
(180 degree peel adhesion to foam)
The 180 degree peel adhesion was measured in accordance with JIS Z0237.
The release liner on One side of the adhesive tape was peeled off, and a PET film having a thickness of 25 μm was used as a liner, and then the release liner on the other side was peeled off, and an EPDM foam having a thickness of 10mm (manufactured by Toyo Quality One, Ltd., product name: RuseelaSE) was bonded under a compressive load of about 5mm in thickness of the EPDM foam. A material obtained by laminating an EPDM foam and an adhesive tape was cut into a size of 20mm in width and 100mm in length to prepare a test piece 9.
The test piece 9 was left to stand at 23 ℃ and 50% RH for 30 minutes, and then the adhesion force to the adhesive tape constituting the test piece 9 was measured at a speed of 300 mm/min in the 180-degree direction from the EPDM foam by a TENSILON tensile tester (model: RTM-100, manufactured by A & D) at 23 ℃ and 50% RH. Note that, 3 measurements were performed, and an average value was calculated.
Further, the adhesive strength of the test piece 9 after being left to stand at 23 ℃ and 50% RH for 24 hours was measured by the same method as described above; and the adhesive strength after the test piece 9 was left to stand at 23 ℃ and 50% RH for 72 hours.
(tear Strength)
A notch having a length of 25mm was cut into the center of the end in the width direction of a release liner cut into a width of 50mm and a length of 100mm, and the strength at the time of tearing at a speed of 0.2 m/min was measured by a TENSILON tensile tester (model: RTM-100, manufactured by A & D, Ltd.).
Preparation example 1
< preparation of emulsion >
75g of ion-exchanged water, 20g of Aqualon KH-1025 (manufactured by first Industrial pharmaceutical Co., Ltd.; effective ingredient 25 mass%) and 37.5g of LATEMUL PD-104 (manufactured by Kao corporation; effective ingredient 20 mass%) as a surfactant were put into a vessel and uniformly dissolved. To this solution, 47.5g of N-butyl acrylate, 410g of 2-ethylhexyl acrylate, 25g of methyl methacrylate, 12.5g of acrylic acid, 5g of N-vinyl-2-pyrrolidone and 0.3g of lauryl mercaptan were added and emulsified to obtain 632.8g of an emulsion.
< preparation of aqueous Dispersion of acrylic Polymer (1) >
287.5g of deionized water was charged into a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet, a thermometer, and a dropping funnel, and the temperature was raised to 55 ℃ while blowing nitrogen. A part (6.33g) of the emulsion, 0.5g (6 mass% of active ingredient) of an aqueous ammonium persulfate solution, and 0.5g (2 mass% of active ingredient) of an aqueous sodium bisulfite solution were added under stirring, and polymerization was carried out for 1 hour while maintaining the temperature at 55 ℃. Next, 626.47g of the remaining emulsion and 20g (5% by mass of active ingredient) of an aqueous solution of V-501 (manufactured by Wako pure chemical industries, Ltd.) as an azo initiator were added dropwise to the mixture and polymerized for 6 hours while maintaining the reaction vessel at 55 ℃ using a different funnel.
After completion of the dropwise addition, the reaction vessel was stirred for 2 hours while being maintained at 60 ℃, and then the contents were cooled and adjusted with ammonia water (active ingredient 10 mass%) so that the pH became 8.0. This was filtered through a 200-mesh wire gauze to obtain an aqueous dispersion (1) of an acrylic polymer. The acrylic polymer aqueous dispersion (1) had a solid content concentration of 50% by mass, and the acrylic polymer contained therein had an average particle diameter of 300nm and a weight average molecular weight of 520,000.
< preparation of acrylic adhesive composition >
To 1000g of the acrylic polymer aqueous dispersion (1), 2.5g of Surfynol PSA-336 (manufactured by Air Products Japan) as a leveling agent, 2.5g of Surfynol DF-110D (manufactured by Air Products Japan) as an antifoaming agent, 100g of SUPERESTER E-865NT (manufactured by Kawakawa chemical industry Co., Ltd., softening point 160 ℃ C., solid content concentration 50 mass%) as an emulsion-type polymerized rosin ester adhesion-imparting resin, and 94.34g of TAMANOL E-200NT (manufactured by Kawakawa chemical industry Co., Ltd., softening point 150 ℃ C., solid content concentration 53 mass%) as an emulsion-type rosin phenol adhesion-imparting resin were added, and the mixture was filtered through a 100 mesh wire gauze to obtain an acrylic adhesive composition (1). The gel fraction of the acrylic pressure-sensitive adhesive composition (1) was 0.1% by mass.
< preparation of acrylic pressure sensitive adhesive >
1.5g of a 10 mass% ethanol solution of TETRAD C (epoxy compound, manufactured by Mitsubishi gas chemical Co., Ltd.) as a crosslinking agent was added to the total amount of the acrylic adhesive composition (1) obtained as described above while stirring, and the mixture was cured at 23 ℃ for 1 week to obtain an acrylic adhesive (1).
Preparation example 2
An aqueous dispersion of an acrylic polymer (2) was prepared in the same manner as in preparation example 1, except that N-butyl acrylate was changed from 47.5g to 50g, 2-ethylhexyl acrylate was changed from 410g to 412.5g, and N-vinyl-2-pyrrolidone was changed from 5g to 0 g. The aqueous dispersion (2) of an acrylic polymer had a solid content concentration of 50% by mass, and the acrylic polymer contained therein had an average particle diameter of 310nm and a weight average molecular weight of 550,000.
An acrylic pressure-sensitive adhesive composition (2) was prepared in the same manner as in preparation example 1, except that the aqueous dispersion of an acrylic polymer (2) was used in place of the aqueous dispersion of an acrylic polymer (1). The gel fraction of the acrylic pressure-sensitive adhesive composition (2) was 0.2% by mass.
An acrylic adhesive (2) was prepared in the same manner as in preparation example 1, except that the acrylic adhesive composition (2) was used in place of the acrylic adhesive composition (1).
Preparation example 3
An aqueous dispersion (3) of an acrylic polymer was prepared in the same manner as in preparation example 2, except that the amount of acrylic acid used was changed from 12.5g to 7.5g, and 5g of methacrylic acid was used. The acrylic polymer aqueous dispersion (3) had a solid content concentration of 50% by mass, and the acrylic polymer contained therein had an average particle diameter of 308nm and a weight average molecular weight of 540,000.
An acrylic pressure-sensitive adhesive composition (3) was prepared in the same manner as in preparation example 1, except that the aqueous dispersion of an acrylic polymer (3) was used in place of the aqueous dispersion of an acrylic polymer (1). The gel fraction of the acrylic pressure-sensitive adhesive composition (3) was 0.1% by mass.
An acrylic adhesive (3) was prepared in the same manner as in preparation example 1, except that the acrylic adhesive composition (3) was used in place of the acrylic adhesive composition (1).
Preparation example 4
An acrylic adhesive composition (4) was prepared in the same manner as in preparation example 1, except that the amount of SUPER ESTER E-865NT (manufactured by KAKIRA CHEMICAL INDUSTRIAL CO., LTD., softening point 160 ℃ C., solid content concentration 50 mass%) used was changed from 100g to 200 g. The gel fraction of the acrylic pressure-sensitive adhesive composition (4) was 0.1% by mass.
An acrylic adhesive (4) was prepared in the same manner as in preparation example 1, except that the acrylic adhesive composition (4) was used in place of the acrylic adhesive composition (1).
Preparation example 5
An acrylic adhesive composition (5) was prepared in the same manner as in preparation example 1, except that the amount of TAMANOL E-200NT (available from KAKIRA CHEMICAL INDUSTRY Co., Ltd., softening point 150 ℃ C., solid content concentration 53% by mass) used was changed from 94.34g to 188.68 g. The gel fraction of the acrylic pressure-sensitive adhesive composition (5) was 0.1% by mass.
An aqueous dispersion type acrylic adhesive (5) was prepared in the same manner as in preparation example 1, except that the acrylic adhesive composition (5) was used in place of the acrylic adhesive composition (1).
TABLE 1
< production of adhesive tape >
(example 1)
In Daolin paper (made by Nippon paper Co., Ltd., mixed N material/L material, basis weight 78g/m2) The polyethylene was extruded at 310 ℃ by a T-die extruder and then cooled while laminating to form a polyolefin layer having a thickness of 20 μm.
To 100 parts by mass of an addition reaction type silicone release agent (product name: SD7333, manufactured by torachemical corporation), 1 part by mass of a platinum catalyst (product name: SRX212, manufactured by torachemical corporation) was added, and the mixture was dissolved in toluene to prepare a coating liquid having a solid content concentration of 5 mass%.
The coating liquid was applied to the upper surface of the polyethylene layer so that the amount of coating became 0.6g/m2(solid content), dried at 100 ℃ for 10 seconds and cured to form a silicone layer, and cured at 40 ℃ for 72 hours to obtain a release liner (1). With respect to the obtained release liner (1), the total weight per unit area was 118g/m2The total thickness was 125 μm, the flow direction tensile strength was 52N/5mm, the width direction tensile strength was 40N/5mm, the flow direction stiffness and softness were 2100mg, the width direction stiffness and softness were 1390mg, the flow direction tear strength was 0.6N, and the peeling load 1(801B method) was 0.12N/20 mm.
Two sheets each having an adhesive layer on a release liner (1) were prepared by applying the acrylic adhesive (1) prepared in preparation example 1 to the release liner (1) so that the thickness after drying would be 65 μm.
Next, a nonwoven fabric (manufactured by Ishikawa Kagaku Co., Ltd., trade name: DI TEX LCN, pulp/rayon (quality) was added as a core base materialWeight ratio) 5/5, basis weight 14g/m238 μm thick), the adhesive agent layer of the sheet was transferred and cured at 40 ℃ for 48 hours to obtain a double-sided adhesive tape (1). The gel fraction of the adhesive layer constituting the adhesive tape (1) was 36.8 mass%.
(example 2)
A release liner (2) was prepared in the same manner as in example 1, except that the thickness of the polyolefin layer was changed from 20 μm to 25 μm. With respect to the obtained release liner (2), the total weight per unit area was 127g/m2The total thickness was 135 μm, the flow direction tensile strength was 60N/5mm, the width direction tensile strength was 50N/5mm, the flow direction stiffness and softness were 2130mg, the width direction stiffness and softness were 1410mg, the flow direction tear strength was 0.6N, and the peeling load 1(801B method) was 0.12N/20 mm.
An adhesive tape (2) was prepared in the same manner as in example 1, except that the release liner (2) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (2) was 36.8 mass%.
(example 3)
A release liner (3) was prepared in the same manner as in example 2, except that 1 part by mass of a platinum catalyst (CAT-PL-50T, trade name, manufactured by shin-Etsu chemical Co., Ltd.) was added to 100 parts by mass of an addition reaction type silicone release agent (KS-847T, trade name, manufactured by shin-Etsu chemical Co., Ltd.) and dissolved in toluene to prepare a coating solution having a solid content concentration of 5% by mass, instead of the coating solution prepared by mixing the addition reaction type silicone release agent (SD7333) and the platinum catalyst (SRX 212). With respect to the obtained release liner (3), the total weight per unit area was 127g/m2The total thickness was 135 μm, the flow direction tensile strength was 59N/5mm, the width direction tensile strength was 49N/5mm, the flow direction stiffness and softness were 2120mg, the width direction stiffness and softness were 1400mg, the flow direction tear strength was 0.6N, and the peeling load 1(801B method) was 0.16N/20 mm.
An adhesive tape (3) was prepared in the same manner as in example 1, except that a release liner (3) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (3) was 36.8 mass%.
(example 4)
A release liner (4) was prepared in the same manner as in example 2, except that 5 parts by mass of a heavy release additive (product name: KS-3800, product name: CAT-PL-50T, product name: shin-Etsu chemical industry Co., Ltd.) and 1 part by mass of a platinum catalyst (product name: CAT-PL-50T, product name: shin-Etsu chemical industry Co., Ltd.) were added to 100 parts by mass of an addition reaction type silicone release agent (product name: KS-847T), and the mixture was dissolved in toluene to prepare a coating liquid having a solid content concentration of 5% by mass. With respect to the obtained release liner (4), the total weight per unit area was 127g/m2The total thickness was 135 μm, the tensile strength in the flow direction was 60N/5mm, the tensile strength in the width direction was 48N/5mm, the rigidity and softness in the flow direction was 2070mg, the rigidity and softness in the width direction was 1390mg, the tear strength in the flow direction was 0.6N, and the peel load 1(801B method) was 0.20N/20 mm.
An adhesive tape (4) was prepared in the same manner as in example 1, except that a release liner (4) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (4) was 36.8 mass%.
(example 5)
A release liner (5) was prepared in the same manner as in example 2, except that 1 part by mass of a platinum catalyst (SRX212, trade name, manufactured by torage corporation) was added to 100 parts by mass of an addition reaction type silicone release agent (SRX 345, manufactured by torage corporation) and dissolved in toluene to prepare a coating liquid having a solid content concentration of 5% by mass, instead of the coating liquid obtained by mixing the addition reaction type silicone release agent (SD7333) and the platinum catalyst (SRX 212). With respect to the obtained release liner (5), the total weight per unit area was 127g/m2The total thickness was 135 μm, the tensile strength in the flow direction was 60N/5mm, the tensile strength in the width direction was 48N/5mm, the rigidity and softness in the flow direction was 2110mg, and the rigidity and softness in the width direction was 1400mg, a tear strength in the flow direction of 0.6N, and a peeling load 1(801B method) of 0.28N/20 mm.
An adhesive tape (5) was prepared in the same manner as in example 1, except that a release liner (5) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (5) was 36.8 mass%.
(example 6)
Except that the polyester resin composition was made of Daolin paper (manufactured by Nippon paper Co., Ltd., N material/L material mixed) and had a weight of 81g/m per unit area2) To replace the forest paper (weight per unit area 78 g/m)2) Except for this, a release liner (6) was prepared in the same manner as in example 4. With respect to the obtained release liner (6), the total weight per unit area was 130g/m2The total thickness was 135 μm, the flow direction tensile strength was 62N/5mm, the width direction tensile strength was 53N/5mm, the flow direction stiffness and softness were 2220mg, the width direction stiffness and softness were 1510mg, the flow direction tear strength was 0.7N, and the peeling load 1(801B method) was 0.20N/20 mm.
An adhesive tape (6) was prepared in the same manner as in example 1, except that a release liner (6) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (6) was 36.8 mass%.
(example 7)
Except for using Daolin paper (made by Nippon paper Co., Ltd., mixed N material/L material, basis weight of 110 g/m)2) To replace the forest paper (weight per unit area 78 g/m)2) A release liner (7) was prepared in the same manner as in example 4 except for the above. With respect to the obtained release liner (7), the total weight per unit area was 140g/m2The total thickness was 150 μm, the flow direction tensile strength was 68N/5mm, the width direction tensile strength was 47N/5mm, the flow direction stiffness was 3360mg, the width direction stiffness was 2580mg, the flow direction tear strength was 1.5N, and the peel load 1(801B method) was 0.20N/20 mm.
An adhesive tape (7) was prepared in the same manner as in example 1, except that a release liner (7) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (7) was 36.8 mass%.
(example 8)
A release liner (8) was prepared in the same manner as in example 7, except that 1 part by mass of a platinum catalyst (SRX212, trade name, manufactured by toray kangning corporation) was added to 100 parts by mass of an addition reaction type silicone release agent (SRX 345, manufactured by toray kangning corporation) and dissolved in toluene to prepare a coating liquid having a solid content concentration of 5% by mass, instead of the coating liquid obtained by mixing the addition reaction type silicone release agent (KS-847T), the heavy release additive (KS-3800), and the platinum catalyst (CAT-PL-50T). With respect to the obtained release liner (8), the total weight per unit area was 140g/m2The total thickness was 150 μm, the flow direction tensile strength was 69N/5mm, the width direction tensile strength was 48N/5mm, the flow direction stiffness and softness were 3400mg, the width direction stiffness and softness were 2680mg, the flow direction tear strength was 1.5N, and the peel load 1(801B method) was 0.28N/20 mm.
An adhesive tape (8) was prepared in the same manner as in example 1, except that a release liner (8) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (8) was 36.8 mass%.
(example 9)
A release liner (9) was prepared in the same manner as in example 4, except that polypropylene was used instead of polyethylene as the polyolefin layer. With respect to the obtained release liner (9), the total weight per unit area was 127g/m2The total thickness was 135 μm, the flow direction tensile strength was 61N/5mm, the width direction tensile strength was 52N/5mm, the flow direction stiffness and softness were 3540mg, the width direction stiffness and softness were 2700mg, the flow direction tear strength was 0.7N, and the peeling load 1(801B method) was 0.20N/20 mm.
An adhesive tape (9) was prepared in the same manner as in example 1, except that a release liner (9) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (9) was 36.8 mass%.
(example 10)
An adhesive tape (10) was prepared in the same manner as in example 2, except that the acrylic adhesive (2) obtained in preparation example 2 was used in place of the acrylic adhesive (1). The gel fraction of the adhesive layer constituting the adhesive tape (10) was 37.4 mass%.
(example 11)
An adhesive tape (11) was prepared in the same manner as in example 4, except that the acrylic adhesive (2) obtained in preparation example 2 was used in place of the acrylic adhesive (1). The gel fraction of the adhesive layer constituting the adhesive tape (11) was 37.4 mass%.
(example 12)
An adhesive tape (12) was prepared in the same manner as in example 2, except that the acrylic adhesive (3) obtained in preparation example 3 was used in place of the acrylic adhesive (1). The gel fraction of the adhesive layer constituting the adhesive tape (12) was 36.5 mass%.
(example 13)
An adhesive tape (13) was prepared in the same manner as in example 4, except that the acrylic adhesive (3) obtained in preparation example 3 was used in place of the acrylic adhesive (1). The gel fraction of the adhesive layer constituting the adhesive tape (13) was 36.5 mass%.
(example 14)
An adhesive tape (14) was prepared in the same manner as in example 2, except that the acrylic adhesive (4) obtained in preparation example 4 was used in place of the acrylic adhesive (1). The gel fraction of the adhesive layer constituting the adhesive tape (14) is 37.0 mass%.
(example 15)
An adhesive tape (15) was prepared in the same manner as in example 2, except that the acrylic adhesive (5) obtained in preparation example 5 was used in place of the acrylic adhesive (1). The gel fraction of the adhesive layer constituting the adhesive tape (14) is 37.0 mass%.
(example 16)
An adhesive tape (16) was prepared in the same manner as in example 2, except that a 16 μm thick PET film (product name: embler SG16, manufactured by yunigaku corporation) was used in place of the nonwoven fabric, and the thickness of the acrylic adhesive (1) after drying was changed from 65 μm to 62 μm. The gel fraction of the adhesive layer constituting the adhesive tape (16) was 36.8 mass%.
Comparative example 1
Except that the polyester resin composition was made of Daolin paper (manufactured by Nippon paper Co., Ltd., N material/L material mixed) and had a weight of 73g/m per unit area2) To replace the forest paper (weight per unit area 78 g/m)2) A release liner (H1) was prepared in the same manner as in example 1 except that. With respect to the resulting release liner (H1), the total basis weight was 122g/m2The total thickness was 125 μm, the tensile strength in the flow direction was 34N/5mm, the tensile strength in the width direction was 22N/5mm, the rigidity and softness in the flow direction was 1880mg, the rigidity and softness in the width direction was 1000mg, the tear strength in the flow direction was 0.6N, and the peeling load 1(801B method) was 0.12N/20 mm.
An adhesive tape (H1) was prepared in the same manner as in example 1, except that a release liner (H1) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (H1) was 36.8 mass%.
Comparative example 2
Except that the polyester resin composition was made of Daolin paper (manufactured by Nippon paper Co., Ltd., N material/L material mixed) and had a weight of 65g/m per unit area2) To replace the forest paper (weight per unit area 78 g/m)2) A release liner (H2) was prepared in the same manner as in example 1 except that. With respect to the resulting release liner (H2), the total basis weight was 105g/m2The total thickness was 110 μm, the tensile strength in the flow direction was 32N/5mm, the tensile strength in the width direction was 20N/5mm, the stiffness and softness in the flow direction was 1070mg, the stiffness and softness in the width direction was 760mg, the tear strength in the flow direction was 0.6N, and the peel load 1(801B method) was 0.12N/20 mm.
An adhesive tape (H2) was prepared in the same manner as in example 1, except that a release liner (H2) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (H2) was 36.8 mass%.
Comparative example 3
Except that the polyester resin composition was made of Daolin paper (manufactured by Nippon paper Co., Ltd., N material/L material mixed) and had a weight of 60g/m per unit area2) To replace the forest paper (weight per unit area 78 g/m)2) A release liner (H3) was prepared in the same manner as in example 1 except that. With respect to the resulting release liner (H3), the total basis weight was 100g/m2The total thickness was 100 μm, the tensile strength in the flow direction was 16N/5mm, the tensile strength in the width direction was 8N/5mm, the stiffness in the flow direction was 910mg, the stiffness in the width direction was 580mg, the tear strength in the flow direction was 0.5N, and the peel load 1(801B method) was 0.13N/20 mm.
An adhesive tape (H3) was prepared in the same manner as in example 1, except that a release liner (H3) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (H3) was 36.8 mass%.
Comparative example 4
A release liner (H4) was prepared in the same manner as in comparative example 2, except that 100 parts by mass of an addition reaction type silicone release agent (product name: SRX345, manufactured by toray corning) was mixed with 1 part by mass of a platinum catalyst (product name: SRX212, manufactured by toray corning) and dissolved in toluene to prepare a coating liquid having a solid content concentration of 5% by mass, instead of the coating liquid in which the addition reaction type silicone release agent (SD7333) and the platinum catalyst (SRX212) were mixed.
With respect to the resulting release liner (H4), the total basis weight was 105g/m2The total thickness was 110 μm, the tensile strength in the flow direction was 32N/5mm, the tensile strength in the width direction was 21N/5mm, the rigidity and softness in the flow direction was 1020mg, the rigidity and softness in the width direction was 840mg, the tear strength in the flow direction was 0.6N, and the peel load 1(801B method) was 0.40N/20 mm.
An adhesive tape (H1) was prepared in the same manner as in example 1, except that a release liner (H4) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (H1) was 36.8 mass%.
Comparative example 5
A release liner (H5) was prepared in the same manner as in comparative example 3, except that 100 parts by mass of an addition reaction type silicone release agent (SRX 345, trade name, manufactured by toray corning corporation) was mixed with 1 part by mass of a platinum catalyst (SRX212, manufactured by toray corning corporation) and dissolved in toluene to prepare a coating liquid having a solid content concentration of 5% by mass, instead of the coating liquid in which the addition reaction type silicone release agent (SD7333) and the platinum catalyst (SRX212) were mixed.
With respect to the resulting release liner (H5), the total basis weight was 100g/m2The total thickness was 100 μm, the flow direction tensile strength was 17N/5mm, the width direction tensile strength was 9N/5mm, the flow direction stiffness and softness were 980mg, the width direction stiffness and softness were 620mg, the flow direction tear strength was 0.5N, and the peel load 1(801B method) was 0.41N/20 mm.
An adhesive tape (H5) was prepared in the same manner as in example 1, except that a release liner (H5) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (H5) was 36.8 mass%.
Comparative example 6
A release liner (H6) was prepared in the same manner as in comparative example 2, except that 100 parts BY mass of an addition reaction type silicone release agent (manufactured BY toraw corning, inc., trade name: SRX345) and 5 parts BY mass of a heavy release additive (BY24-843) were mixed with 1 part BY mass of a platinum catalyst (manufactured BY toraw corning, inc., trade name: SRX212) and dissolved in toluene to prepare a coating liquid having a solid content concentration of 5 mass%, instead of the coating liquid obtained BY mixing the addition reaction type silicone release agent (SD7333) and the platinum catalyst (SRX 212).
An adhesive tape (H6) was prepared in the same manner as in example 1, except that a release liner (H6) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (H6) was 36.8 mass%.
Comparative example 7
100 parts by mass of an addition reaction type silicone release agent (trade name: KS-847T, manufactured by shin-Etsu chemical industries, Ltd.), 5 parts by mass of a heavy release additive (trade name: KS-3800, manufactured by shin-Etsu chemical industries, Ltd.) and 1 part by mass of a platinum catalyst (trade name: CAT-PL-50T, manufactured by shin-Etsu chemical industries, Ltd.) were mixed and dissolved in toluene to prepare a coating liquid adjusted to have a solid content concentration of 5% by mass.
Is made of cellophane (paper made of prince, Inc.) and mixed with N material/L material, and has a weight of 81g/m per unit area2) So that the coating amount becomes 0.8g/m2(solid content), dried at 100 ℃ for 5 minutes to cure, thereby forming a silicone layer, and cured at 40 ℃ for 72 hours, thereby obtaining a release liner (H7).
With respect to the resulting release liner (H7), the total basis weight was 90g/m2The total thickness was 90 μm, the flow direction tensile strength was 21N/5mm, the width direction tensile strength was 11N/5mm, the flow direction stiffness was 1750mg, the width direction stiffness was 910mg, the flow direction tear strength was 0.6N, and the peeling load 1(801B method) was 0.20N/20 mm.
An adhesive tape (H7) was prepared in the same manner as in example 1, except that a release liner (H7) was used in place of the release liner (1). The gel fraction of the adhesive layer constituting the adhesive tape (H7) was 36.8 mass%.
The following table shows the results of the above evaluations on the release liners used in the examples and comparative examples and the produced adhesive tapes.
TABLE 2
TABLE 3
TABLE 4
TABLE 5
TABLE 6
The following results are clear from the table: the adhesive tapes of the present invention shown in examples 1 to 16 are excellent in adhesion to foam, low in release load of release liner, and excellent in manual peeling suitability of release liner, while the adhesive tapes shown in comparative examples 1 to 7 are high in release load of release liner, and poor in manual peeling suitability of release liner.
Description of the symbols
1 EPDM foam
2 adhesive layer
3 core substrate
4 Release liner
5 adhesive tape
6 test piece 7.

Claims (13)

1. An adhesive tape characterized in that both surfaces of a core base material (A) are provided with an adhesive layer (B) formed by an aqueous adhesive composition, a release liner (C) is laminated on one or both surfaces of the adhesive layer (B), and the release liner (C) has a weight per unit area of 75g/m containing chemical pulp2～85g/m2The paper of (1) has a polyolefin layer on one or both sides thereof, and has a silicone layer on one or both sides of the polyolefin layer,
the adhesive agent layer (B) contains an acrylic polymer obtained by polymerizing a monomer component containing: comprising a vinyl monomer having a nitrogen atom of N-vinylpyrrolidone, a vinyl monomer having a carboxyl group, and a (meth) acrylate having an alkyl group having 4 to 8 carbon atoms,
the 180-degree peel adhesion of the adhesive layer (B) to a foam material is 1.5N/20mm or more, and the peel force when the release liner (C) is peeled from the adhesive layer (B) is 1N/20mm or less.
2. The adhesive tape according to claim 1, wherein the polyolefin layer has a thickness of 15 to 30 μm, the silicone layer is a layer formed by an addition reaction type silicone-based release agent, and the release liner (C) has a thickness of 100 to 200 μm.
3. The adhesive tape according to claim 1 or 2, wherein the release liner (C) has a peeling load of 0.5N/20mm or less with respect to an adhesive layer having a thickness of 90 μm formed by "SK Dyne 801B", which is a solvent-based adhesive manufactured by Soken chemical Co.
4. The adhesive tape of claim 1, wherein the paper is a linerboard paper obtained from a chemical pulp comprising softwood bleached kraft pulp and hardwood bleached kraft pulp.
5. The adhesive tape according to claim 1, wherein the core substrate (A) is a nonwoven fabric having a thickness in the range of 20 to 80 μm.
6. The adhesive tape according to claim 1, wherein the adhesive layer (B) formed on at least one side of the core substrate (A) has a thickness of 15 to 80 μm.
7. The adhesive tape according to claim 1, wherein the acrylic polymer has a glass transition temperature of-70 ℃ to-50 ℃, wherein the glass transition temperature is a value calculated from the formula of FOX.
8. The adhesive tape according to claim 1, wherein the adhesive layer (B) contains an adhesion-imparting resin having a softening point in the range of 140 ℃ to 180 ℃.
9. Adhesive tape according to claim 1 for the fixing of foam materials.
10. The adhesive tape of claim 9, wherein the foam material is a polyolefin foam.
11. The adhesive tape according to claim 1, wherein the gel fraction of the adhesive layer (B) is 20 to 45% by mass.
12. The adhesive tape according to claim 1, wherein the glass transition temperature Tg is from-70 ℃ to-54 ℃.
13. A method for producing a member, characterized in that the adhesive tape according to any one of claims 1 to 12 is stacked with 1 or 2 or more sheets and cut by a punching process.
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JP6019180B1 (en) * 2015-06-18 2016-11-02 積水化学工業株式会社 (Meth) acrylic adhesive and adhesive tape
JP2018203863A (en) * 2017-06-02 2018-12-27 Dic株式会社 Adhesive tape, article, and manufacturing method of article
WO2019066060A1 (en) * 2017-09-28 2019-04-04 積水化学工業株式会社 Adhesive composition and adhesive tape
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