WO2019240056A1 - 撥液層形成用樹脂組成物、並びに、それを用いた撥液性フィルム、撥液性積層体、包装材及び容器 - Google Patents
撥液層形成用樹脂組成物、並びに、それを用いた撥液性フィルム、撥液性積層体、包装材及び容器 Download PDFInfo
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- 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
- B32B2307/73—Hydrophobic
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- 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
- B32B2307/732—Dimensional properties
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- 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
- B32B2439/00—Containers; Receptacles
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- 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
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
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- 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
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
Definitions
- the present disclosure relates to a resin composition for forming a liquid repellent layer, and a liquid repellent film, a liquid repellent laminate, a packaging material, and a container using the same.
- packaging materials corresponding to the contents of various products such as foods, beverages, pharmaceuticals, and chemicals have been developed.
- plastic materials excellent in water resistance, oil resistance, gas barrier properties, light weight, flexibility, design, etc. are used as packaging materials for contents such as liquids, semi-solids, and gel substances.
- plastic laminates made by laminating multiple types of plastic substrates, paper, metal foil, inorganic A composite laminate of a material or the like and a plastic substrate, and a composite obtained by treating a plastic substrate with a functional composition have been proposed.
- a function of suppressing the adhesion of contents such as a liquid, a semi-solid, or a gel substance to the inner surface of the packaging material, that is, the remaining inside the packaging body is required.
- containers for yogurt, jelly, syrup, etc., retort food packaging materials such as porridge, soup, curry, pasta sauce, liquids such as chemicals and pharmaceuticals, semi-solids, gels, etc.
- the contents adhere to the inner surface, and the contents cannot be used up completely, resulting in waste, contamination caused by the contents, and the contents being discharged.
- high liquid repellency capable of suppressing labor.
- Patent Document 1 proposes a water-repellent packaging material in which a silicone resin composition layer containing hydrophobic fine particles such as silicone particles is provided on the inner surface of the packaging material.
- Patent Document 2 proposes a packaging material having water repellency and releasability with a resin layer added with spherical silicon as the innermost layer.
- a polyolefin resin such as polyethylene or polypropylene is used as a material imparting functions such as heat sealability, heat resistance, and impact resistance.
- silicone particles are added to the polyolefin resin to impart liquid repellency, aggregation of the silicone particles in the resin layer and release of the silicone particles from the resin layer are likely to occur. The effect of suppressing the adhesion of contents to the inner surface of the material was not always sufficient.
- the present disclosure has been made in view of the above-described problems of the prior art, and a resin composition capable of forming a liquid repellent layer capable of sufficiently suppressing the adhesion of contents, and a liquid repellent using the same.
- An object is to provide a conductive film, a liquid repellent laminate, a packaging material and a container.
- the present disclosure is compatible with (A) a polyolefin resin, (B) a silylated polyolefin, and a site compatible with the (A) polyolefin resin and the (B) silylated polyolefin.
- a resin composition for forming a liquid repellent layer comprising a (C) compatibilizer having a moiety, wherein the polyolefin moiety of the (B) silylated polyolefin is incompatible with the (A) polyolefin resin.
- the resin composition for forming a liquid repellent layer (A) a polyolefin resin, (B) a silylated polyolefin whose polyolefin part is incompatible with the (A) polyolefin resin, and (C) a compatibilizer.
- the liquid repellent layer which can fully suppress the adhesion of the contents can be formed.
- Silylated polyolefin is a component that imparts liquid repellency to the liquid repellent layer, but only (B) silylated polyolefin in which (A) polyolefin resin is incompatible with (A) polyolefin resin.
- (B) silylated polyolefins aggregate in the liquid repellent layer to be formed, the dispersibility is poor and the liquid repellent layer is hardly unevenly distributed, and it is difficult to obtain sufficient liquid repellent properties.
- (C) a compatibilizer together with (B) silylated polyolefin (B) the dispersibility of silylated polyolefin is improved, and (B) the polyolefin part of silylated polyolefin is (C)
- compatibilizing with (A) polyolefin resin via a compatibilizing agent the silicone part of (B) silylated polyolefin is likely to be unevenly distributed on the surface of the liquid repellent layer, and efficiently imparts liquid repellency to the liquid repellent layer. be able to. Thereby, the liquid repellent layer which has the liquid repellency superior to the case where the conventional silicone particle is used can be formed.
- the compatibilizer (C) is selected from the group consisting of a block copolymer of propylene and ethylene, and a block copolymer of ethylene and ethylene / butylene copolymer. At least one kind selected may be included.
- these (C) compatibilizers for example, it is possible to use polypropylene for one of the polyolefin sites of (A) polyolefin resin and (B) silylated polyolefin, and polyethylene for the other. This gives the liquid repellent layer functions such as heat sealability, heat resistance and impact resistance, and suitability for packaging materials where heat treatment such as hot water such as retort food packaging materials is applied. It becomes easy.
- the mass ratio of the content of the (C) compatibilizer to the content of the (B) silylated polyolefin may be 0.05-20.
- the content ratio is within the above range, the formed liquid repellent layer can more sufficiently suppress adhesion of the contents.
- the present disclosure also includes (A) a polyolefin resin, and (B) a silylated polyolefin, and the polyolefin portion of the (B) silylated polyolefin is compatible with the (A) polyolefin resin.
- a composition is provided.
- the liquid repellent formed by using together (A) a polyolefin resin and (B) a silylated polyolefin in which the polyolefin portion is compatible with (A) the polyolefin resin.
- the dispersibility of (B) silylated polyolefin is improved, and (B) the silicone part of silylated polyolefin becomes liquid repellent because (B) the polyolefin part of silylated polyolefin is compatible with (A) polyolefin resin. It becomes easy to be unevenly distributed on the surface of the layer, liquid repellency can be efficiently imparted to the liquid repellent layer, and adhesion of contents to the liquid repellent layer can be sufficiently suppressed.
- the resin composition for forming a liquid repellent layer may further contain (D) silicone.
- D silicone.
- the amount of Si present on the surface of the liquid-repellent layer to be formed can be increased, and thereby liquid repellency can be further improved.
- the present disclosure also provides a liquid repellent film including a liquid repellent layer formed using the liquid repellent layer forming resin composition of the present disclosure.
- a liquid-repellent film by providing the liquid-repellent layer formed using the resin composition for forming a liquid-repellent layer of the present disclosure, the adhesion of contents to the liquid-repellent layer can be sufficiently suppressed. Can do.
- favorable liquid repellency can be expressed not only with water and oil but with respect to oil-in-water-dispersed contents such as curry and pasta sauce.
- the liquid repellent film may further include one or more resin layers provided on one main surface of the liquid repellent layer.
- the liquid repellent film has a multilayer structure including a resin layer other than the liquid repellent layer, it is possible to impart further functionality (heat resistance, impact resistance, etc.) in addition to liquid repellency.
- the liquid repellent layer can be thinned, and the cost can be reduced.
- the melting point T2 (° C.) of the resin contained in the resin layer in contact may satisfy the relationship of T1 ⁇ T2.
- the (B) silylated polyolefin in the liquid repellent layer can be prevented from transferring to the second resin layer, and (B) silylated to the liquid repellent layer surface. Since the efficiency of uneven distribution or bleeding out of the polyolefin can be improved, the liquid repellency tends to be further improved.
- the present disclosure also includes a base material and the liquid repellent film of the present disclosure provided on the base material, wherein the liquid repellent layer is disposed on at least one outermost surface. Provide the body.
- a liquid-repellent laminate by providing the liquid-repellent film of the present disclosure, adhesion of contents to the liquid-repellent layer can be sufficiently suppressed. Further, by laminating a liquid repellent film with a base material having a desired function, functions such as mechanical strength, barrier property, and light shielding property can be imparted to the liquid repellent laminate.
- the present disclosure also provides a packaging material formed using the liquid repellent laminate of the present disclosure. According to such a packaging material, since it is formed using the liquid repellent laminate of the present disclosure, adhesion of contents to the liquid repellent layer can be sufficiently suppressed.
- the packaging material may be used for a heat treatment of 80 ° C. or higher. According to the packaging material which concerns on this embodiment, even if it is a case where it is used for such a use, adhesion of the content to the packaging material inner surface can be suppressed even after heat processing.
- the present disclosure further provides a container having a liquid repellent layer formed using the resin composition of the present disclosure on the inner surface. According to such a container, since the liquid repellent layer formed using the resin composition for forming a liquid repellent layer according to the present disclosure is provided, adhesion of contents to the liquid repellent layer can be sufficiently suppressed. .
- a resin composition capable of forming a liquid repellent layer capable of sufficiently suppressing the adhesion of contents, and a liquid repellent film, a liquid repellent laminate, a packaging material, and a container using the resin composition can be provided.
- the liquid-repellent laminate according to this embodiment includes a base material and a liquid-repellent film provided on the base material, and has a structure in which the liquid-repellent layer is disposed on at least one outermost surface. It is. 1 and 2 are schematic cross-sectional views of the liquid repellent laminate according to this embodiment.
- a liquid repellent film 10 composed of a liquid repellent layer 11 and a base material 14 are interposed via an adhesive 13 as in the liquid repellent laminate 1 shown in FIG. It may have a laminated structure.
- the liquid repellent laminate according to the present embodiment includes a liquid repellent film 10 composed of a liquid repellent layer 11 and a second resin layer 12, and a substrate, like the liquid repellent laminate 2 shown in FIG. 14 may have a structure laminated with an adhesive 13 interposed therebetween.
- the liquid repellent film 10 includes the second resin layer 12
- the liquid repellent film 10 is based on the second resin layer 12 so that the liquid repellent layer 11 is the outermost surface of the liquid repellent laminate 2. It arrange
- the liquid repellent layer 11 is a layer having liquid repellency.
- the liquid repellent layer 11 may be a layer that can exhibit heat sealability by heating.
- the liquid repellency is a concept including both water repellency and oil repellency characteristics.
- the liquid repellency is a characteristic of liquid repellency to a liquid, semi-solid or gel aqueous or oily material. It is. Examples of water-based or oil-based materials include water, oil, yogurt, jelly, pudding, syrup, rice cake, soup, curry, pasta sauce and other foods, hand soap, shampoo and other detergents, pharmaceuticals, cosmetics and chemicals. .
- heat sealability refers to a property that enables heat seal under conditions of 100 to 200 ° C., 0.1 to 0.3 MPa, and 1 to 3 seconds, for example.
- the heat sealing conditions can be easily changed according to the conditions required for heat sealing the liquid-repellent laminate.
- the thickness of the liquid repellent layer 11 is preferably 0.1 to 100 ⁇ m, more preferably 1 to 70 ⁇ m, still more preferably 3 to 50 ⁇ m, and particularly preferably 5 to 30 ⁇ m.
- the thickness of the liquid repellent layer 11 is equal to or more than the above lower limit value, good liquid repellency and heat sealability tend to be easily obtained.
- the thickness is not more than the above upper limit value, the thickness of the entire liquid repellent laminate can be reduced.
- the liquid repellent layer 11 can be formed using a resin composition for forming a liquid repellent layer containing the following components.
- a resin composition for forming the liquid repellent layer will be described.
- the resin composition for forming a liquid repellent layer includes (A) a polyolefin resin (hereinafter also referred to as “(A) component”), (B) a silylated polyolefin (hereinafter referred to as “(B) component”. And (C) a compatibilizing agent (hereinafter also referred to as “component (C)”) having a part compatible with the (A) polyolefin resin and a part compatible with the (B) silylated polyolefin. ), And the polyolefin moiety of the (B) silylated polyolefin is incompatible with the (A) polyolefin resin.
- component (C) component) a compatibilizing agent having a part compatible with the (A) polyolefin resin and a part compatible with the (B) silylated polyolefin.
- the resin composition for forming a liquid repellent layer includes (A) a polyolefin resin and (B) a silylated polyolefin, and the polyolefin portion of the (B) silylated polyolefin has the above (A ) It is compatible with polyolefin resin.
- the resin composition for forming a liquid repellent layer contains (C) a compatibilizing agent as an essential component when the polyolefin part of (B) silylated polyolefin is incompatible with (A) polyolefin resin, ) When the polyolefin part of silylated polyolefin is compatible with (A) polyolefin resin, (C) compatibilizer is not required.
- the resin composition for forming a liquid repellent layer may further contain (D) silicone.
- the polyolefin resin is not particularly limited, and examples thereof include low density polyethylene, medium density polyethylene, high density polyethylene, ethylene- ⁇ olefin copolymer, homo, block or random polypropylene, and propylene- ⁇ olefin copolymer.
- Examples of the ⁇ -olefin component include ethylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 4-methyl-1-pentene and the like.
- the copolymer may be a random copolymer or a block copolymer.
- the polyolefin resin may be a cyclic polyolefin such as polynorbornene.
- the polyolefin resin is preferably a linear polyolefin from the viewpoint of sealing properties and strength properties (tensile strength, impact strength, etc.), and the linear polyolefin may be linear or branched.
- the polyolefin resin When the liquid-repellent laminate is used for a packaging material that is subjected to a heat treatment such as a water bath such as a retort food packaging material, the polyolefin resin preferably contains a polypropylene resin. When the polyolefin resin contains the polypropylene resin, it is easy to prevent the bag-shaped packaging material from being broken by heat treatment such as hot water.
- polypropylene resin examples include homopolypropylene, block polypropylene, random polypropylene, and a copolymer of propylene and an ⁇ -olefin other than ethylene and propylene as described above.
- the block polypropylene here is different from an ethylene-propylene block copolymer which is a compatibilizer (C) described later, and generally EPR (rubber component) and polyethylene are dispersed in homopolypropylene at the polymerization stage. It has a structure.
- the polypropylene resin preferably contains random polypropylene or block polypropylene. By including random polypropylene, there is a tendency that heat sealing at a low temperature and in a short time becomes easy. By including block polypropylene, heat resistance and impact resistance are improved, and there is a tendency that it is easy to prevent the bag-like packaging material from being broken by heat.
- the melting point of the polyolefin resin can be appropriately adjusted according to the end use.
- the melting point of the polyolefin resin is preferably 130 to 170 ° C.
- the polyolefin resin may be a modified polyolefin modified with a predetermined acid.
- the modified polyolefin is obtained by graft-modifying a polyolefin with an unsaturated carboxylic acid derivative component derived from, for example, an unsaturated carboxylic acid, an acid anhydride of an unsaturated carboxylic acid, an ester of an unsaturated carboxylic acid, or the like.
- modified polyolefins such as a hydroxyl group modified polyolefin and an acrylic modified polyolefin, can also be used as polyolefin resin.
- polyolefin resins can be used singly or in combination of two or more.
- Silylated polyolefin is a component that imparts liquid repellency to the liquid repellent layer 11.
- Silylated polyolefin is a polyolefin unit having a silicone moiety.
- silylated polyolefins examples include products manufactured by Toray Dow Corning Co., Ltd. as PE-Si graft copolymers, EXFORA manufactured by Mitsui Chemicals Fine Co., Ltd. as PP-Si block copolymers, and PP-Si graft copolymers.
- Examples of coalescence include products manufactured by Toray Dow Corning Co., Ltd.
- a block copolymer is preferable to a graft copolymer from the viewpoint of further improving the liquid repellency of the liquid repellent layer 11. This is because the block copolymer tends to be unevenly distributed or bleed out on the surface of the liquid repellent layer 11.
- silylated polyolefin can be used singly or in combination of two or more.
- the silylated polyolefin may be one in which the polyolefin part is compatible with the (A) polyolefin resin, or may be incompatible (incompatible).
- the silylated polyolefin whose polyolefin part is incompatible with (A) polyolefin resin is used, it is essential to use it together with the following (C) compatibilizing agent.
- (C) compatibilizing agent when using the silylated polyolefin whose polyolefin part is incompatible with (A) polyolefin resin, (A) polyolefin resin and (B) silylated polyolefin are used together with (C) compatibilizer.
- the compatibilizing agent is used when (B) a silylated polyolefin having a polyolefin site incompatible with the (A) polyolefin resin is used as the silylated polyolefin (B).
- the compatibilizing agent is a component having (A) a part compatible with the polyolefin resin and (B) a part compatible with the silylated polyolefin.
- Examples of the site compatible with the polyolefin resin include (A) a polyolefin structure compatible with the polyolefin resin, and (A) a site having the same type of polyolefin structure as the polyolefin resin is preferable. That is, when the (A) polyolefin resin is a polyethylene resin, the (C) compatibilizer preferably has a polyethylene structure, and when the (A) polyolefin resin is a polypropylene resin, the (C) compatibilizer is a polypropylene structure. It is preferable to have.
- the polyolefin resin is a copolymer composed of two or more olefins such as an ethylene- ⁇ olefin copolymer and a propylene- ⁇ olefin copolymer
- the compatibilizer contains the above copolymer It is preferable to have at least a structure obtained by polymerizing or copolymerizing the same type of olefin as the main component among the olefins constituting the coalescence.
- the part compatible with the silylated polyolefin includes a polyolefin structure compatible with the polyolefin part of (B) silylated polyolefin, and (B) has the same type of polyolefin structure as the polyolefin part of silylated polyolefin.
- a site is preferred. That is, (B) when the polyolefin part of silylated polyolefin has a polyethylene structure, (C) the compatibilizer preferably has a polyethylene structure, and (B) when the polyolefin part of silylated polyolefin has a polypropylene structure, C) The compatibilizer preferably has a polypropylene structure.
- the compatibilizing agent preferably has at least a structure obtained by polymerizing or copolymerizing the same type of olefin as the main component among the olefins constituting the copolymer.
- the compatibilizer is composed of, for example, a polyethylene unit composed of polyethylene or ethylene / ⁇ -olefin copolymer and a polypropylene unit composed of polypropylene or propylene / ⁇ -olefin copolymer.
- a block copolymer or a block copolymer composed of a polyethylene unit and an ethylene / butylene copolymer unit can be used.
- Such a block copolymer may have any structure of a diblock copolymer, a triblock copolymer, and a multiblock copolymer.
- the polyolefin part of (A) the polyolefin resin or (B) silylated polyolefin is polyethylene
- the part and the polyethylene part (polyethylene unit) of the (C) compatibilizing agent are compatible with each other.
- the polyolefin part of the resin or (B) silylated polyolefin is polypropylene
- the part and the polypropylene part (polypropylene unit) or ethylene / butylene copolymer part (ethylene / butylene copolymer unit) of the compatibilizer (C) And are compatible.
- the above-mentioned compatibilizers can be used singly or in combination of two or more.
- Silicone is a component that further improves the liquid repellency of the liquid repellent layer 11.
- silicone include silicone oil, silicone resin, silicone oligomer, and silicone powder. Among these, silicone oil is preferable because better liquid repellency can be easily obtained.
- silicone oil examples include dimethyl silicone oil, methylphenyl silicone oil, methyl hydrogen silicone oil, cyclic dimethyl silicone oil, alkyl-modified silicone oil, long-chain alkyl-modified silicone oil, and higher fatty acid-modified silicone oil.
- silicone oil examples include products manufactured by Asahi Kasei Wacker Silicone Co., Ltd., products manufactured by Shin-Etsu Chemical Co., Ltd., products manufactured by Momentive Performance Materials, Inc., products manufactured by Toray Dow Corning Co., Ltd., and the like.
- silicone resin examples include products manufactured by Shin-Etsu Chemical Co., Ltd. and products manufactured by Asahi Kasei Wacker Silicone Co., Ltd.
- silicone oligomer examples include products manufactured by Shin-Etsu Chemical Co., Ltd. and products manufactured by Toray Dow Corning Co., Ltd.
- silicone powder examples include products manufactured by Shin-Etsu Chemical Co., Ltd. and products manufactured by Toray Dow Corning Co., Ltd.
- silicones can be used alone or in combination of two or more.
- the content of the component (A) in the liquid repellent layer forming resin composition is preferably 50.0 to 99.9% by mass based on the total solid content of the liquid repellent layer forming resin composition, 55
- the content is more preferably 0.0 to 99.0% by mass, and still more preferably 60.0 to 98.0% by mass.
- the content of the component (A) is not less than the above lower limit value, good heat sealability tends to be obtained.
- the content of the component (A) is less than or equal to the above upper limit, the content of the component (B) and the component (C) is relatively increased, so that the liquid repellency tends to be improved.
- the total content of the component (B) and the component (C) in the resin composition for forming a liquid repellent layer is 0.1 to 50.0% by mass based on the total solid content of the resin composition for forming a liquid repellent layer. It is preferably 1.0 to 45.0% by mass, more preferably 2.0 to 40.0% by mass.
- the total content of the component (B) and the component (C) is not less than the above lower limit value, the liquid repellency tends to be improved.
- the total content of the component (B) and the component (C) is equal to or less than the above upper limit value, the content of the component (A) is relatively increased, so that good heat sealability tends to be easily obtained. is there.
- the mass ratio of the content of the component (C) to the content of the component (B) (mass of the component (C) / mass of the component (B)) May be from 0.01 to 50, preferably from 0.05 to 30, and more preferably from 0.05 to 20.
- the content ratio is not less than the above lower limit value, the (B) silylated polyolefin can be sufficiently dispersed in the liquid repellent layer, and a better liquid repellency tends to be obtained.
- the (B) silylated polyolefin when the content ratio is less than or equal to the above upper limit value, it is possible to prevent the (B) silylated polyolefin from being coated with an excessive (C) compatibilizing agent and obtain better liquid repellency. Tend. Moreover, even if the (C) compatibilizer is added so that the content ratio exceeds the above upper limit value, the (B) silylated polyolefin does not disperse any further, and the effect of improving the liquid repellency tends not to be seen. There is.
- the resin composition for forming a liquid repellent layer contains the component (D)
- its content is preferably 0.1 to 20.0% by mass based on the total amount of the resin composition for forming a liquid repellent layer.
- the content is more preferably 0.0 to 15.0% by mass, and further preferably 2.0 to 10.0% by mass.
- the content of the component (D) is not less than the above lower limit, the liquid repellency tends to be improved.
- the content of the component (D) is not more than the above upper limit value, the content of the component (A) is relatively increased, so that good heat sealability tends to be obtained.
- content of (D) component exceeds the said upper limit, there exists a tendency for liberation of (D) component from a liquid repellent layer to produce easily.
- the resin composition for forming a liquid repellent layer may contain other additives as required, as long as the liquid repellency is not impaired.
- other additives include flame retardants, slip agents, antiblocking agents, antioxidants, light stabilizers, and tackifiers.
- the liquid repellent layer 11 can be formed by forming the liquid repellent layer forming resin composition.
- the second resin layer 12 is a layer provided between the liquid repellent layer 11 and the base material 14 in order to improve heat sealability, heat resistance and impact resistance, oxygen / water vapor barrier properties, and the like.
- the second resin layer 12 preferably contains a thermoplastic resin having heat sealability.
- the thermoplastic resin used for the second resin layer 12 is not particularly limited, but is a polyolefin resin, an ethylene- ⁇ , ⁇ -unsaturated carboxylic acid copolymer or an esterified product thereof, an ionic cross-linked product, or an ethylene-vinyl acetate copolymer. Or saponified product thereof, polyvinyl acetate or saponified product thereof, polycarbonate resin, thermoplastic polyester resin, ABS resin, polyacetal resin, polyamide resin, polyphenylene oxide resin, polyimide resin, polyurethane resin, polylactic acid resin, furan resin, and silicone resin Etc. These thermoplastic resins can be used singly or in combination of two or more.
- the thermoplastic resin used for the second resin layer 12 preferably contains a polyolefin resin because heat sealability, heat resistance and impact resistance are easily improved.
- polyolefin resin the thing similar to (A) polyolefin resin used for the liquid-repellent layer 11 can be used.
- T2 (° C.) preferably satisfies the relationship of T1 ⁇ T2.
- the melting point T2 is preferably higher than the melting point T1 by 1 ° C. or more, more preferably 3 ° C. or more.
- the thickness of the second resin layer 12 can be appropriately set according to the final use of the commercial product using the resin composition for forming a liquid repellent layer.
- the thickness of the second resin layer 12 is, for example, preferably 0.1 to 300 ⁇ m, more preferably 1 to 200 ⁇ m, still more preferably 5 to 150 ⁇ m, and more preferably 10 to 100 ⁇ m. Is particularly preferred.
- the liquid repellent film 10 having liquid repellency is formed by the single layer of the liquid repellent layer 11 described above or the two layers of the liquid repellent layer 11 and the second resin layer 12.
- the liquid repellent film 10 is formed so as to cover part or all of the surface of the substrate 14.
- the liquid repellent film 10 may be used alone without being laminated with the base material 14 depending on the application.
- the liquid repellent film 10 may further include one or more resin layers other than the liquid repellent layer 11 and the second resin layer 12.
- the composition of the other resin layers may be the same as or different from the composition of the second resin layer 12.
- the base material 14 is a thing used as a support body, there will be no restriction
- paper, a resin film, metal foil, etc. are mentioned.
- the paper include high-quality paper, special high-quality paper, coated paper, art paper, cast-coated paper, imitation paper, and craft paper.
- the resin film include polyolefin (for example, polyethylene (PE), polypropylene (PP), etc.), acid-modified polyolefin, polyester (for example, polyethylene terephthalate (PET)), polyamide (PA), polyvinyl chloride (PVC), cellulose acetate,
- a film containing at least one kind of cellophane resin can be used. This film may be a stretched film or an unstretched film.
- the metal foil include aluminum foil and nickel foil.
- the substrate 14 may be a laminate of a plurality of substrates made of different materials.
- the thickness of the substrate 14 is not particularly limited and can be appropriately adjusted according to the use, but is usually 1 to 500 ⁇ m, preferably 10 to 100 ⁇ m.
- Examples of the method for bonding the base material 14 and the liquid repellent film 10 include, but are not limited to, a laminating method using an adhesive and a laminating method using heat treatment as described below.
- laminating method with adhesive As a laminating method using an adhesive, various known laminating methods such as dry laminating, wet laminating, and non-solvent laminating can be used. Examples of the adhesive 13 used in these laminating methods include the following.
- the adhesive 13 bonds the liquid repellent film 10 and the base material 14 together.
- the adhesive 13 include a polyurethane resin obtained by allowing a bifunctional or higher functional isocyanate compound to act on a main agent such as polyester polyol, polyether polyol, acrylic polyol, and carbonate polyol.
- the various polyols described above can be used singly or in combination of two or more.
- the adhesive 13 may further contain a carbodiimide compound, an oxazoline compound, an epoxy compound, a phosphorus compound, a silane coupling agent, or the like in the polyurethane resin described above for the purpose of promoting adhesion.
- the thickness of the adhesive 13 is not particularly limited, but is preferably 1 to 10 ⁇ m, and more preferably 3 to 7 ⁇ m from the viewpoint of obtaining desired adhesive strength, followability, workability, and the like.
- laminating method by heat treatment As a laminating method by heat treatment, the following methods can be given. (1) A method in which an adhesive resin is extruded between a liquid-repellent film 10 formed in advance and a substrate 14 and laminated. (2) A method in which the resin layer constituting the liquid repellent film 10 and an adhesive resin are coextruded and laminated with the base material 14. (3) A method in which the laminate substrate obtained by the above method (1) or (2) is further bonded by heating and pressing with a hot roll. (4) A method in which the laminate substrate obtained by the method (1) or (2) is further stored in a high temperature atmosphere or passed through a drying / baking furnace in a high temperature atmosphere.
- Examples of the adhesive resin used in the laminating method by heat treatment include acid-modified polyolefin.
- the base material 14 and the liquid repellent film 10 are laminated by extrusion lamination, but an acid-modified polyolefin-based coating agent (dissolving type, dispersion type) is previously applied to the base material without performing extrusion lamination. It is also possible to laminate the liquid-repellent film 10 by heat treatment after coating on 14.
- the base material 14 can be provided with an adhesive primer (anchor coat).
- an adhesive primer an adhesive primer
- polyester, polyurethane, polyallylamine, polyethyleneimine, polybutadiene, ethylene-vinyl acetate copolymer, chlorine-vinyl acetate, or the like can be used. You may mix
- the packaging material according to the present embodiment is formed using the liquid repellent laminate described above.
- Specific examples of the packaging material include lid materials for containers such as yogurt, jelly, and syrup, and retort food packaging materials (retort pouches) such as porridge, soup, curry, and pasta sauce.
- the innermost layers of the packaging material may be difficult to be discharged due to blocking, but according to the packaging material according to this embodiment, The liquid repellent layers that are the innermost layers are difficult to block each other, and the contents can be discharged efficiently.
- the packaging material may be used for a heat treatment of 80 ° C. or higher. Specifically, it may be used for packaging materials that are subjected to heat treatment such as hot water baths such as retort food packaging materials. According to the packaging material which concerns on this embodiment, even if it is a case where it is a case where it is used for such a use, adhesion and the residue of the content to the packaging material inner surface can be suppressed even after heat processing.
- the container which concerns on this embodiment is a container which has the liquid repellent layer formed using the resin composition for liquid repellent layer formation mentioned above at least on the inner surface (content side).
- the container include storage containers for liquids such as chemicals and pharmaceuticals, semi-solids and gel substances, bottles for storing hand soaps and shampoos, and the like.
- Example 1 ⁇ Preparation of resin composition for forming liquid repellent layer> (A) Component linear low density polyethylene (LLDPE, trade name “Evolue”, manufactured by Prime Polymer Co., Ltd.) and (B) component silylated polyethylene (PE-Si graft copolymer, Toray The resin composition for liquid repellent layer formation was prepared. The content of each component was adjusted so that the component (B) was 5% by mass and the balance was the component (A) based on the total amount of the component (A) and the component (B).
- LLDPE Component linear low density polyethylene
- PE-Si graft copolymer component silylated polyethylene
- liquid-repellent layer-forming resin composition was extruded to form a liquid-repellent film composed of a liquid-repellent layer having a thickness of 100 ⁇ m.
- the obtained liquid repellent film and a 38 ⁇ m-thick PET film (trade name “Emblet”, manufactured by Unitika Co., Ltd.) as a base material were dried using a polyurethane adhesive (manufactured by Mitsui Chemicals, Inc.).
- the laminate was laminated and aged at 50 ° C. for 5 days to obtain a liquid repellent laminate.
- Examples 2 to 10 As shown in Table 1, the types of component (A) and component (B) in the resin composition for forming a liquid repellent layer, and the content of component (B) (the content of component (A) is the remainder) A liquid repellent layer-forming resin composition, a liquid repellent film, and a liquid repellent laminate were produced in the same manner as in Example 1 except that the changes were made.
- a liquid repellent film and a liquid repellent laminate were produced in the same manner as in Example 1 except that the resin composition for forming a liquid repellent layer was used.
- Example 12 to 13 In the same manner as in Example 11 except that the types of the components (A) and (B) in the liquid repellent layer forming resin composition were changed as shown in Table 1, the liquid repellent layer forming resin composition, A liquid film and a liquid repellent laminate were prepared.
- Example 14 ⁇ Preparation of resin composition for forming liquid repellent layer> In the same manner as in Example 1, a resin composition for forming a liquid repellent layer was produced.
- the second resin layer of the obtained liquid repellent film and a 38 ⁇ m-thick PET film (trade name “Emblet”, manufactured by Unitika Co., Ltd.) as a base material were combined with a polyurethane adhesive (Mitsui Chemicals, Inc.). And a liquid-repellent laminate was obtained.
- Example 15 The liquid repellent layer forming resin composition and the second resin were the same as in Example 14 except that the type of the component (A) in the second resin layer forming resin composition was changed as shown in Table 1. A layer-forming resin composition, a liquid-repellent film, and a liquid-repellent laminate were produced.
- Example 16 ⁇ Preparation of resin composition for forming liquid repellent layer> Random polypropylene (propylene-ethylene random copolymer, trade name “Prime Polypro”, manufactured by Prime Polymer Co., Ltd.) as component (A) and silylated polyethylene (PE-Si-PE triblock as component (B)) A copolymer, trade name “EXFORA” manufactured by Mitsui Chemicals Fine Co., Ltd.) and a block copolymer of PP-PE as component (C) were mixed to prepare a resin composition for forming a liquid repellent layer. .
- each component is 5% by mass for the (B) component, 0.1% by mass for the (C) component, and the balance is (%) based on the total amount of the (A), (B) and (C) components.
- A) It adjusted so that it might become a component.
- Example 17 to 56 Types of component (A), component (B) and component (C), and content of component (B) and component (C) in the resin composition for forming a liquid repellent layer (content of component (A) are those And the liquid repellent layer in the same manner as in Example 16 except that the type of component (A) in the second resin layer forming resin composition was changed as shown in Tables 1 and 2.
- a forming resin composition, a second resin layer forming resin composition, a liquid repellent film, and a liquid repellent laminate were produced.
- Example 25 as shown in Table 1, the component (D) was further added to the resin composition for forming a liquid repellent layer.
- a liquid repellent layer-forming resin composition, a second resin layer-forming resin composition, a repellent material are the same as in Example 14 except that the component (B) is not added to the liquid repellent layer-forming resin composition.
- a liquid film and a liquid repellent laminate were prepared.
- Comparative Example 2 Comparative example except that the type of component (A) in the resin composition for forming a liquid repellent layer and the type of component (A) in the second resin layer forming resin composition were changed as shown in Table 2. In the same manner as in Example 1, a liquid repellent layer forming resin composition, a second resin layer forming resin composition, a liquid repellent film, and a liquid repellent laminate were produced.
- Example 5 A liquid repellent layer-forming resin composition, a second resin layer-forming resin composition, a repellent layer were formed in the same manner as in Example 24 except that the component (B) was not added to the liquid repellent layer-forming resin composition. A liquid film and a liquid repellent laminate were prepared.
- Tables 1 and 2 show the details of each component as follows. “-” In Table 1 and Table 2 means that the corresponding component was not used. Tables 1 and 2 show the mass ratio of the content of component (C) to the content of component (B) in the liquid repellent layer (mass of component (C) / mass of component (B)). . In Tables 1 and 2, the melting point T1 (° C.) of the resin that is the component (A) used for the liquid repellent layer and the melting point T2 of the resin that is the component (A) used for the second resin layer are shown. (° C.). Further, Tables 1 and 2 show the compatibility between the component (A) and the component (B) (polyolefin part) in the liquid repellent layer.
- A1 Linear low density polyethylene (LLDPE), trade name “Evolue”, melting point 116 ° C., Prime Polymer Co., Ltd.
- A2 Random polypropylene (propylene-ethylene random copolymer), trade name “Prime Polypro”, melting point 134 ° C, Prime Polymer Co., Ltd.
- A3 block polypropylene, trade name “Novatech”, melting point 165-166 ° C., Nippon Polypro Co., Ltd.
- A4 linear low density polyethylene (LLDPE), trade name “Novatech LL”, melting point 122 °C, made by Nippon Polyethylene Corporation
- B1 PE-Si graft copolymer, Toray Dow Corning
- B2 PE-Si-PE triblock copolymer, trade name “EXFORA”, Mitsui Chemicals Fine
- B3 PP-Si Graft copolymer made by Toray Dow Corning Co., Ltd.
- C1 Block copolymer of propylene and ethylene
- C2 Block copolymer of ethylene and ethylene / butylene copolymer
- FIG. 3 shows Examples 1 to 6, 11, 14 to 15, 34 to 40 and Comparative Example 1 using linear low density polyethylene (LLDPE) as the component (A) in the resin composition for forming a liquid repellent layer.
- LLDPE linear low density polyethylene
- the liquid repellency without heat treatment was evaluated by the method shown. First, the sample 100 obtained by cutting the liquid-repellent laminates obtained in Examples and Comparative Examples into 210 mm length ⁇ 300 mm width was folded in two into a size of 210 mm length ⁇ 150 mm width so that the liquid repellent layer was inside. (See (a) of FIG.
- one side of the vertical end and one side of the horizontal end are 190 ° C., 0.03 MPa
- a seal part 51 was formed by heat-sealing over a width of 10 mm under a condition of 2 sec, and a pouch having one side opened in the longitudinal direction was produced (see FIG. 3B).
- 100 g of salad oil 52 (trade name “Nisshin Salad Oil”, manufactured by Nisshin Oilio Co., Ltd.) was injected from the opening of the pouch (see (c) of FIG. 3).
- the opening was heat sealed with a heat sealer over a width of 10 mm under the conditions of 190 ° C., 0.03 MPa, and 2 sec to form a seal portion 51, and the pouch was sealed (see FIG. 3D).
- angular part with the side where the sealed pouch turned up the part which becomes a triangle of 3 cm in length x 3 cm in width with the dimension except the seal part 51 was cut
- Residual liquid amount (%) ⁇ (100 ⁇ discharged amount) / 100 ⁇ ⁇ 100
- the measurement was performed three times, and the liquid repellency was evaluated from the average residual liquid amount of the three times according to the following evaluation criteria.
- Tables 3 and 4 show the average residual liquid amount (%) and the evaluation results of liquid repellency.
- ⁇ The average residual liquid amount is 2.5% or more and less than 3.5%.
- the liquid volume is 3.5% or more
- Examples 7 to 10, 12 to 13, 16 to 33, 41 to 56 and Comparative Examples 2 to 5 Liquid repellency after hot water treatment and after retort treatment> Examples 7 to 10, 12 to 13, 16 to 33, 41 to 56 and comparison using random polypropylene (PP-PE random copolymer) or block polypropylene as the component (A) in the resin composition for forming a liquid repellent layer With respect to Examples 2 to 5, the liquid repellency after the hot water treatment and after the retort treatment was evaluated by the method shown in FIG. First, two samples 200 were prepared by cutting the liquid-repellent laminates obtained in Examples and Comparative Examples into a length of 210 mm and a width of 150 mm.
- PP-PE random copolymer random polypropylene
- block polypropylene block polypropylene
- each liquid repellent layer is on the inside, and one side of the longitudinal end and two sides of the lateral end are 190 ° C., 0.03 MPa, 2 sec with a heat sealer.
- the seal part 51 was formed by heat sealing over a width of 10 mm under conditions, and a pouch with one side opening in the longitudinal direction was produced (see FIG. 4A).
- 100 g of an oil-in-water dispersion type liquid 54 (trade name “Boncurry”, manufactured by Otsuka Foods Co., Ltd.) was injected from the opening of the pouch (see FIG. 4B). Thereafter, the opening was heat sealed with a heat sealer over a width of 10 mm under the conditions of 190 ° C., 0.03 MPa, and 2 sec to form a seal portion 51, and the pouch was sealed (see FIG. 4C).
- the sealed pouch was treated with hot water at 100 ° C. for 5 minutes.
- retort processing after putting the sealed pouch into a high-temperature and high-pressure cooking sterilizer (manufactured by Hitachi Capital Co., Ltd.), retort processing is performed at 121 ° C. for 30 minutes under high-pressure steam under a pressure of 0.2 MPa. Further, the above-described hot water treatment was performed.
- the top of the sealed pouch was cut to form a spout (see (d) of FIG. 4).
- Tables 3 and 4 show the average residual liquid amount (%) and the evaluation results of liquid repellency.
- ⁇ Average residual liquid amount is less than 8.0%
- ⁇ Average residual liquid amount is 8.0% or more and less than 10.0%
- ⁇ Average residual liquid amount is 10.0% or more and less than 13.0%
- ⁇ Average residual liquid Liquid volume is 13.0% or more
- the liquid repellent laminates of Examples 1 to 56 have liquid repellency compared to the liquid repellent laminates of Comparative Examples 1 to 5. It was confirmed that it can be improved.
- liquid repellent laminates of Examples 41 to 56 are particularly good because the melting point T1 of the resin in the liquid repellent layer and the melting point T2 of the resin in the second resin layer satisfy the relationship of T1 ⁇ T2. It was found that excellent liquid repellency was obtained.
- the liquid repellent laminate of Example 16 has a low mass ratio of (C) component / (B) component of 0.02, and the liquid repellent laminate of Example 17 has (C) component / (B ) Component has a high mass ratio of 25, which is repellent compared to the liquid repellent laminates of other examples in which the mass ratio of component (C) / component (B) is in the range of 0.05-20.
- the liquidity was slightly low. However, it was confirmed that the liquid repellent laminates of Examples 16 and 17 can improve the liquid repellency as compared with the liquid repellent laminate of the comparative example.
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Abstract
Description
本実施形態に係る撥液性積層体は、基材と、該基材上に設けられた撥液性フィルムと、を備え、撥液層が少なくとも一方の最表面に配置された構造を有するものである。図1及び図2は、本実施形態に係る撥液性積層体の概略断面図である。本実施形態に係る撥液性積層体は、図1に示す撥液性積層体1のように、撥液層11からなる撥液性フィルム10と、基材14とが、接着剤13を介して積層された構造を有するものであってもよい。また、本実施形態に係る撥液性積層体は、図2に示す撥液性積層体2のように、撥液層11及び第2の樹脂層12からなる撥液性フィルム10と、基材14とが、接着剤13を介して積層された構造を有するものであってもよい。撥液性フィルム10が第2の樹脂層12を備える場合、撥液性フィルム10は、撥液層11が撥液性積層体2の最表面となるように、第2の樹脂層12が基材14と対向するように配置される。
撥液層11は撥液性を有する層である。撥液層11は、加熱によりヒートシール性を発現することができる層であってもよい。ここで、撥液性とは、撥水性及び撥油性の両特性を包含する概念であり、具体的には、液体状、半固体状、もしくはゲル状の水性又は油性材料に対し撥液する特性である。水性又は油性材料としては、水、油、ヨーグルト、ゼリー、プリン、シロップ、お粥、スープ、カレー、パスタソース等の食品、ハンドソープ、シャンプー等の洗剤、医薬品、化粧品、化学品などが挙げられる。また、ヒートシール性とは、一例として、100~200℃、0.1~0.3MPa、1~3秒間の条件にてヒートシールが可能である性質をいう。ヒートシールの条件は、撥液性積層体のヒートシールに要する条件に応じて容易に変更することが可能である。
本開示の一実施形態に係る撥液層形成用樹脂組成物は、(A)ポリオレフィン樹脂(以下、「(A)成分」ともいう)、(B)シリル化ポリオレフィン(以下、「(B)成分」ともいう)、並びに、上記(A)ポリオレフィン樹脂と相溶する部位及び上記(B)シリル化ポリオレフィンと相溶する部位を有する(C)相溶化剤(以下、「(C)成分」ともいう)を含み、上記(B)シリル化ポリオレフィンのポリオレフィン部位が上記(A)ポリオレフィン樹脂と非相溶であるものである。
ポリオレフィン樹脂としては特に制限されず、例えば、低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、エチレン-αオレフィン共重合体、ホモ、ブロック、あるいはランダムポリプロピレン、プロピレン-αオレフィン共重合体等が挙げられる。αオレフィン成分としては、エチレン、1-ブテン、1-ペンテン、1-ヘキセン、1-ヘプテン、1-オクテン、4-メチル-1-ペンテンなどを例示することができる。共重合体は、ランダム共重合体でもブロック共重合体でもよい。上記以外でも、ポリオレフィン樹脂は、ポリノルボルネンなどの環状ポリオレフィンであってもよい。また、上記ポリオレフィン樹脂は、シール性及び強度物性(引張強度、衝撃強度など)の観点から、線状ポリオレフィンが好ましく、線状ポリオレフィンは直鎖状でも分岐状でもよい。
シリル化ポリオレフィンは、撥液層11に撥液性を付与する成分である。シリル化ポリオレフィンは、ポリオレフィンユニットにシリコーン部位を持たせたものである。
相溶化剤は、(B)シリル化ポリオレフィンとしてポリオレフィン部位が(A)ポリオレフィン樹脂と非相溶であるシリル化ポリオレフィンを用いる場合に用いられる。相溶化剤は、(A)ポリオレフィン樹脂と相溶する部位及び上記(B)シリル化ポリオレフィンと相溶する部位を有する成分である。相溶化剤を用いることにより、ポリオレフィン部位が(A)ポリオレフィン樹脂と非相溶である(B)シリル化ポリオレフィンと(A)ポリオレフィン樹脂との相溶性を向上させることができる。
シリコーンは、撥液層11の撥液性をより向上させる成分である。シリコーンとしては、例えば、シリコーンオイル、シリコーンレジン、シリコーンオリゴマー、シリコーンパウダー等が挙げられる。これらの中でも、より良好な撥液性が得られ易いことから、シリコーンオイルが好ましい。
第2の樹脂層12は、ヒートシール性、耐熱性及び耐衝撃性、酸素・水蒸気バリア性等を向上させるために撥液層11と基材14との間に設けられる層である。第2の樹脂層12は、ヒートシール性を有する熱可塑性樹脂を含むことが好ましい。
上述した撥液層11単層、又は、撥液層11及び第2の樹脂層12の2層により、撥液性を有する撥液性フィルム10が形成される。撥液性フィルム10は、基材14の表面の一部又は全部を覆うように形成されている。なお、撥液性フィルム10は、用途に応じて、基材14と積層せずに撥液性フィルム10単独で使用してもよい。
基材14は、支持体となる物であれば特に制限はなく、例えば紙、樹脂フィルム、金属箔等が挙げられる。紙としては、上質紙、特殊上質紙、コート紙、アート紙、キャストコート紙、模造紙、クラフト紙等が挙げられる。樹脂フィルムとしては、ポリオレフィン(例えばポリエチレン(PE)、ポリプロピレン(PP)等)、酸変性ポリオレフィン、ポリエステル(例えばポリエチレンテレフタレート(PET)等)、ポリアミド(PA)、ポリ塩化ビニル(PVC)、セルロースアセテート、セロファン樹脂の少なくとも一種を含むフィルムが挙げられる。このフィルムは延伸フィルムでもよいし、非延伸フィルムでもよい。金属箔としては、例えばアルミ箔、ニッケル箔等が挙げられる。基材14は、材質の異なる複数の基材を積層したものであってもよい。
接着剤によるラミネート方法としては、ドライラミネート、ウェットラミネート、ノンソルベントラミネートなどの各種公知のラミネート方法を用いることができる。これらのラミネート方法に用いられる接着剤13としては以下のものが挙げられる。
接着剤13は、撥液性フィルム10と基材14とを接着するものである。接着剤13としては、例えば、ポリエステルポリオール、ポリエーテルポリオール、アクリルポリオール、カーボネートポリオールなどの主剤に対し、2官能以上のイソシアネート化合物を作用させたポリウレタン樹脂等が挙げられる。上述した各種ポリオールは、一種を単独で又は二種以上を組み合わせて用いることができる。
熱処理によるラミネート方法としては、大きく以下の方法が挙げられる。
(1)接着性樹脂を、あらかじめ製膜した撥液性フィルム10と基材14との間に押出し、ラミネートする方法。
(2)撥液性フィルム10を構成する樹脂層と接着性樹脂とを共押出しし、基材14とラミネートする方法。
(3)上記(1)もしくは(2)の方法で得られたラミネート基材を、更に熱ロールで加熱・加圧することにより接着させる方法。
(4)上記(1)もしくは(2)の方法で得られたラミネート基材を、更に高温雰囲気下で保管する、あるいは高温雰囲気下の乾燥・焼付け炉を通過させる方法。
本実施形態に係る包装材は、上述した撥液性積層体を用いて形成されたものである。包装材として具体的には、ヨーグルト、ゼリー、シロップ等の容器の蓋材、お粥、スープ、カレー、パスタソース等のレトルト食品包装材(レトルトパウチ)などが挙げられる。包装材の内面(内容物側)に撥液層が配置されるように包装材を形成することで、液体や半固体、ゲル状物質等の内容物の包装材内面への付着や残存を抑制することができる。また、レトルト食品包装材のような袋状の包装材においては、包装材の最内層同士がブロッキングすることで内容物が排出され難くなる場合があるが、本実施形態に係る包装材によれば、最内層である撥液層同士がブロッキングし難く、内容物を効率的に排出することができる。
本実施形態に係る容器は、上述した撥液層形成用樹脂組成物を用いて形成された撥液層を少なくとも内面(内容物側)に有する容器である。容器として具体的には、化学品や医薬品等の液体、半固体、ゲル状物質等の保存容器、ハンドソープやシャンプー等を収容するボトルなどが挙げられる。容器の内面(内容物側)に撥液層が配置されるように容器を形成することで、液体や半固体、ゲル状物質等の内容物の容器内面への付着や残存を抑制することができる。
<撥液層形成用樹脂組成物の作製>
(A)成分である直鎖状低密度ポリエチレン(LLDPE、商品名「エボリュー」、株式会社プライムポリマー製)と、(B)成分であるシリル化ポリエチレン(PE-Siのグラフト共重合体、東レ・ダウコーニング株式会社製)とを混合し、撥液層形成用樹脂組成物を調製した。各成分の含有量は、(A)成分及び(B)成分の総量を基準として、(B)成分が5質量%、残部が(A)成分となるように調整した。
3層共押出し機を用いて、撥液層形成用樹脂組成物を押出し製膜し、厚さ100μmの撥液層からなる撥液性フィルムを得た。得られた撥液性フィルムと、基材である厚さ38μmのPETフィルム(商品名「エンブレット」、ユニチカ株式会社製)とを、ポリウレタン系接着剤(三井化学株式会社製)を用いてドライラミネートし、50℃で5日間エージングして、撥液性積層体を得た。
撥液層形成用樹脂組成物における(A)成分及び(B)成分の種類、並びに、(B)成分の含有量((A)成分の含有量はその残部)を、表1に示すように変更したこと以外は実施例1と同様にして、撥液層形成用樹脂組成物、撥液性フィルム及び撥液性積層体を作製した。
<撥液層形成用樹脂組成物の作製>
(A)成分である直鎖状低密度ポリエチレン(LLDPE、商品名「エボリュー」、株式会社プライムポリマー製)と、(B)成分であるシリル化ポリエチレン(PE-Si-PEのトリブロック共重合体、商品名「イクスフォーラ」、三井化学ファイン株式会社製)と、(D)成分であるシリコーンオイル(ジメチルシリコーン、東レ・ダウコーニング株式会社製)とを混合し、撥液層形成用樹脂組成物を調製した。各成分の含有量は、(A)成分、(B)成分及び(D)成分の総量を基準として、(B)成分が5質量%、(D)成分が5質量%、残部が(A)成分となるように調整した。
上記撥液層形成用樹脂組成物を用いたこと以外は実施例1と同様にして、撥液性フィルム及び撥液性積層体を作製した。
撥液層形成用樹脂組成物における(A)成分及び(B)成分の種類を表1に示すように変更したこと以外は実施例11と同様にして、撥液層形成用樹脂組成物、撥液性フィルム及び撥液性積層体を作製した。
<撥液層形成用樹脂組成物の作製>
実施例1と同様にして、撥液層形成用樹脂組成物を作製した。
(A)成分である直鎖状低密度ポリエチレン(LLDPE、商品名「エボリュー」、株式会社プライムポリマー製)を、第2の樹脂層形成用樹脂組成物とした。3層共押出し機を用いて、撥液層形成用樹脂組成物と第2の樹脂層形成用樹脂組成物とを共押出し製膜し、厚さ15μmの撥液層と厚さ85μmの第2の樹脂層からなる撥液性フィルムを得た。得られた撥液性フィルムの第2の樹脂層と、基材である厚さ38μmのPETフィルム(商品名「エンブレット」、ユニチカ株式会社製)とを、ポリウレタン系接着剤(三井化学株式会社製)を用いてドライラミネートし、撥液性積層体を得た。
第2の樹脂層形成用樹脂組成物における(A)成分の種類を表1に示すように変更したこと以外は実施例14と同様にして、撥液層形成用樹脂組成物、第2の樹脂層形成用樹脂組成物、撥液性フィルム及び撥液性積層体を作製した。
<撥液層形成用樹脂組成物の作製>
(A)成分であるランダムポリプロピレン(プロピレン-エチレンランダム共重合体、商品名「プライムポリプロ」、株式会社プライムポリマー製)と、(B)成分であるシリル化ポリエチレン(PE-Si-PEのトリブロック共重合体、商品名「イクスフォーラ」、三井化学ファイン株式会社製)と、(C)成分であるPP-PEのブロック共重合体とを混合し、撥液層形成用樹脂組成物を調製した。各成分の含有量は、(A)成分、(B)成分及び(C)成分の総量を基準として、(B)成分が5質量%、(C)成分が0.1質量%、残部が(A)成分となるように調整した。
上記撥液層形成用樹脂組成物を用い、且つ、第2の樹脂層形成用樹脂組成物における(A)成分の種類を表1に示すように変更したこと以外は実施例14と同様にして、撥液性フィルム及び撥液性積層体を作製した。
撥液層形成用樹脂組成物における(A)成分、(B)成分及び(C)成分の種類、並びに、(B)成分及び(C)成分の含有量((A)成分の含有量はそれらの残部)と、第2の樹脂層形成用樹脂組成物における(A)成分の種類とを、表1及び表2に示すように変更したこと以外は実施例16と同様にして、撥液層形成用樹脂組成物、第2の樹脂層形成用樹脂組成物、撥液性フィルム及び撥液性積層体を作製した。なお、実施例25では、表1に示すように、撥液層形成用樹脂組成物に(D)成分を更に添加した。
撥液層形成用樹脂組成物に(B)成分を添加しなかったこと以外は実施例14と同様にして、撥液層形成用樹脂組成物、第2の樹脂層形成用樹脂組成物、撥液性フィルム及び撥液性積層体を作製した。
撥液層形成用樹脂組成物における(A)成分の種類と、第2の樹脂層形成用樹脂組成物における(A)成分の種類とを、表2に示すように変更したこと以外は比較例1と同様にして、撥液層形成用樹脂組成物、第2の樹脂層形成用樹脂組成物、撥液性フィルム及び撥液性積層体を作製した。
撥液層形成用樹脂組成物における(A)成分及び(B)成分の種類、並びに、(B)成分の含有量((A)成分の含有量はその残部)と、第2の樹脂層形成用樹脂組成物における(A)成分の種類とを、表2に示すように変更したこと以外は実施例14と同様にして、撥液層形成用樹脂組成物、第2の樹脂層形成用樹脂組成物、撥液性フィルム及び撥液性積層体を作製した。
撥液層形成用樹脂組成物に(B)成分を添加しなかったこと以外は実施例24と同様にして、撥液層形成用樹脂組成物、第2の樹脂層形成用樹脂組成物、撥液性フィルム及び撥液性積層体を作製した。
A1:直鎖状低密度ポリエチレン(LLDPE)、商品名「エボリュー」、融点116℃、株式会社プライムポリマー製
A2:ランダムポリプロピレン(プロピレン-エチレンランダム共重合体)、商品名「プライムポリプロ」、融点134℃、株式会社プライムポリマー製
A3:ブロックポリプロピレン、商品名「ノバテック」、融点165~166℃、日本ポリプロ株式会社製
A4:直鎖状低密度ポリエチレン(LLDPE)、商品名「ノバテックLL」、融点122℃、日本ポリエチレン株式会社製
B1:PE-Siのグラフト共重合体、東レ・ダウコーニング株式会社製
B2:PE-Si-PEのトリブロック共重合体、商品名「イクスフォーラ」、三井化学ファイン株式会社製
B3:PP-Siのグラフト共重合体、東レ・ダウコーニング株式会社製
C1:プロピレンとエチレンとのブロック共重合体
C2:エチレンとエチレン・ブチレン共重合体とのブロック共重合体
D1:シリコーンオイル(ジメチルシリコーン)、東レ・ダウコーニング株式会社製
<実施例1~6、11、14~15、34~40及び比較例1:熱処理なしでの撥液性>
撥液層形成用樹脂組成物における(A)成分として直鎖状低密度ポリエチレン(LLDPE)を用いた実施例1~6、11、14~15、34~40及び比較例1について、図3に示した方法により、熱処理なしでの撥液性の評価を行った。まず、実施例及び比較例で得られた撥液性積層体を縦210mm×横300mmにカットしたサンプル100を、撥液層が内側となるように縦210mm×横150mmのサイズに2つに折り畳み(図3の(a)を参照)、縦方向端部の1辺と横方向端部の1辺(折り返した辺とは反対側の辺)とを、ヒートシーラーで190℃、0.03MPa、2secの条件で10mm幅にわたって熱封緘してシール部51を形成し、縦方向端部の一辺が開口しているパウチを作製した(図3の(b)を参照)。次に、パウチの開口部から100gのサラダ油52(商品名「日清サラダ油」、日清オイリオ社製)を注液した(図3の(c)を参照)。その後、開口部をヒートシーラーで190℃、0.03MPa、2secの条件で10mm幅にわたって熱封緘してシール部51を形成し、パウチを密閉した(図3の(d)を参照)。密閉したパウチの折り返した辺のある角部について、シール部51を除いた寸法で縦3cm×横3cmの三角形となる部分を切断して注ぎ口を形成した(図3の(e)を参照)。注ぎ口と対角線上にある角部53を持ち、パウチを逆さにして30秒間保持し、容器56にサラダ油52を排出させて、秤57により排出量(g)を秤量した(図3の(f)を参照)。秤量した排出量から、下記式により残液量(%)を求めた。
残液量(%)={(100-排出量)/100}×100
測定は3回行い、3回の平均残液量から下記評価基準により撥液性を評価した。平均残液量(%)及び撥液性の評価結果を表3及び表4に示す。
◎:平均残液量が2.0%未満
○:平均残液量が2.0%以上2.5%未満
△:平均残液量が2.5%以上3.5%未満
×:平均残液量が3.5%以上
撥液層形成用樹脂組成物における(A)成分としてランダムポリプロピレン(PP-PEランダム共重合体)又はブロックポリプロピレンを用いた実施例7~10、12~13、16~33、41~56及び比較例2~5について、図4に示した方法により、湯煎処理後及びレトルト処理後の撥液性の評価を行った。まず、実施例及び比較例で得られた撥液性積層体を縦210mm×横150mmにカットしたサンプル200を2枚用意した。2枚のサンプル200を、それぞれの撥液層が内側となるように重ね、縦方向端部の1辺と横方向両端部の2辺とを、ヒートシーラーで190℃、0.03MPa、2secの条件で10mm幅にわたって熱封緘してシール部51を形成し、縦方向端部の一辺が開口しているパウチを作製した(図4の(a)を参照)。次に、パウチの開口部から100gの水中油分散型液体54(商品名「ボンカレー」、大塚食品社製)を注液した(図4の(b)を参照)。その後、開口部をヒートシーラーで190℃、0.03MPa、2secの条件で10mm幅にわたって熱封緘してシール部51を形成し、パウチを密閉した(図4の(c)を参照)。
残液量(%)={(100-排出量)/100}×100
測定は3回行い、3回の平均残液量から下記評価基準により撥液性を評価した。平均残液量(%)及び撥液性の評価結果を表3及び表4に示す。
◎:平均残液量が8.0%未満
○:平均残液量が8.0%以上10.0%未満
△:平均残液量が10.0%以上13.0%未満
×:平均残液量が13.0%以上
上記撥液性評価において、パウチ内から液体を排出した際の液体の排出挙動を目視にて観察し、下記評価基準により外観評価を行った。結果を表3及び表4に示す。
○:液体をはじく様子が見られ、撥液性積層体への付着が少ない。
△:液体をはじく様子は見られるが、撥液性積層体に付着している。
×:液体をはじく様子が見られない。
Claims (12)
- (A)ポリオレフィン樹脂、(B)シリル化ポリオレフィン、並びに、前記(A)ポリオレフィン樹脂と相溶する部位及び前記(B)シリル化ポリオレフィンと相溶する部位を有する(C)相溶化剤を含み、前記(B)シリル化ポリオレフィンのポリオレフィン部位が前記(A)ポリオレフィン樹脂と非相溶である、撥液層形成用樹脂組成物。
- 前記(C)相溶化剤が、プロピレンとエチレンとのブロック共重合体、及び、エチレンとエチレン・ブチレン共重合体とのブロック共重合体からなる群より選択される少なくとも一種を含む、請求項1に記載の樹脂組成物。
- 前記(B)シリル化ポリオレフィンの含有量に対する前記(C)相溶化剤の含有量の質量比((C)相溶化剤の質量/(B)シリル化ポリオレフィンの質量)が0.05~20である、請求項1又は2に記載の樹脂組成物。
- (A)ポリオレフィン樹脂、及び、(B)シリル化ポリオレフィンを含み、前記(B)シリル化ポリオレフィンのポリオレフィン部位が前記(A)ポリオレフィン樹脂と相溶する、撥液層形成用樹脂組成物。
- (D)シリコーンを更に含む、請求項1~4のいずれか一項に記載の樹脂組成物。
- 請求項1~5のいずれか一項に記載の樹脂組成物を用いて形成された撥液層を備える撥液性フィルム。
- 前記撥液層の一方の主面上に設けられた1層以上の樹脂層を更に備える、請求項6に記載の撥液性フィルム。
- 前記撥液層中の前記(A)ポリオレフィン樹脂の融点T1(℃)と、前記1層以上の樹脂層のうち前記撥液層と接する樹脂層に含まれる樹脂の融点T2(℃)とが、T1<T2の関係を満たす、請求項7に記載の撥液性フィルム。
- 基材と、該基材上に設けられた請求項6~8のいずれか一項に記載の撥液性フィルムと、を備え、前記撥液層が少なくとも一方の最表面に配置されている、撥液性積層体。
- 請求項9に記載の撥液性積層体を用いて形成された包装材。
- 80℃以上の加熱処理を施す用途に用いられる、請求項10に記載の包装材。
- 請求項1~5のいずれか一項に記載の樹脂組成物を用いて形成された撥液層を少なくとも内面に有する容器。
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JP2021095538A (ja) * | 2019-12-19 | 2021-06-24 | 凸版印刷株式会社 | 撥液層形成用樹脂組成物、並びに、それを用いた撥液性フィルム、撥液性積層体および包装材 |
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JP2020189664A (ja) * | 2019-05-22 | 2020-11-26 | 凸版印刷株式会社 | 撥液性樹脂組成物、並びに、それを用いた撥液性フィルム、撥液性積層体および包装材 |
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EP4201982A4 (en) * | 2020-08-21 | 2024-08-07 | Toyo Boseki | SEALING FILM |
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JPWO2019240056A1 (ja) | 2021-07-15 |
EP3816225A4 (en) | 2022-03-09 |
EP3816225A1 (en) | 2021-05-05 |
JP7383233B2 (ja) | 2023-11-20 |
CN112041387A (zh) | 2020-12-04 |
TW202003785A (zh) | 2020-01-16 |
TWI819003B (zh) | 2023-10-21 |
US20210115231A1 (en) | 2021-04-22 |
US12065557B2 (en) | 2024-08-20 |
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