JPH0985916A - Decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet which is free from generation of a toxic gas such as hydrogen chloride or the like in incineration, has a highly decorative irregular pattern, is suitable for lapping and V-cutting, and economically low costed. SOLUTION: A printed layer 2 is provided on a surface of a copolymer polyester resin layer 1 of a co-extruded film 1 constituted by laminating a copolymer polyester resin layer 1a having a thermal adhesive property and flexibility on a colored polyester resin layer 1b. An irregular pattern by embossing is formed on a surface of the printed layer 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet that is attached to various kinds of furniture, building surface materials, etc. for the purpose of decoration or surface protection.

[0002]

2. Description of the Related Art Conventionally, a base sheet used for a decorative sheet of this type is required to have flexibility so that it can fit and adhere to the surface shape of an adherend to which the decorative sheet is adhered. It A vinyl chloride film is used as a base sheet for a decorative sheet having such material suitability. In addition to the above-mentioned flexibility, this vinyl chloride film has excellent suitability for other materials, that is, workability such as embossing, coloring, and adhesiveness. However, this vinyl chloride film not only generates a toxic gas when incinerated because it contains a halogen group element, but when it adheres to the substrate, the plasticizer migrates to the adhesive layer and causes adhesion failure, The thermal dimensional stability is poor, and elongation and shrinkage due to heat occur, causing wrinkles.

On the other hand, as a material for overcoming such drawbacks of the vinyl chloride film, a colored biaxially stretched polyester film, a polyester resin synthetic paper, a colored polyolefin resin film or the like is used as a base sheet, and a printing layer is formed thereon. In addition, a decorative sheet having an uneven pattern by embossing has been proposed, but in the case of a colored biaxially stretched polyester film, it is difficult to express an uneven pattern of high design because of poor embossing shapeability, and wrapping, V-cutting Inferior in molding processing suitability such as processing, in the case of polyester resin synthetic paper, interlayer adhesion strength, peeling resistance, wear resistance and other physical properties are inferior, so members used as building materials are limited,
In the case of a colored polyolefin resin film, there are drawbacks that the film strength is inferior, and the adhesiveness with other plastic films and the adhesion to printing ink are poor.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to prevent the generation of toxic gases such as hydrogen chloride during incineration, and to provide a highly designed uneven pattern. And to provide an economical and inexpensive decorative sheet suitable for post-processing such as lapping and V-cut processing.

[0005]

In order to achieve the above object, the decorative sheet of the present invention has a constitution in which a copolyester resin layer having thermal adhesiveness and flexibility and a colored polyester resin layer are laminated. A printing layer is provided on the surface of the copolyester resin layer of the coextrusion film, and an embossing pattern is formed on the surface of the printing layer by embossing.

Further, a printed layer and a transparent acrylic resin are formed on the surface of the copolyester resin layer of the coextrusion film having a structure in which a copolyester resin layer having thermal adhesiveness and flexibility and a colored polyester resin layer are laminated. It is preferable that a surface protective layer made of a film is sequentially provided, and an uneven pattern formed by embossing is formed on the surface of the surface protective layer.

The copolyester resin layer having the thermal adhesiveness and flexibility of the coextrusion film has a softening temperature of 150 to 200 ° C. and a tensile Young's modulus of 1 to 30 kg /
consist mm ^2, the Young's modulus colored polyester resin layer is pulled at a softening temperature of two hundred and thirty-five to two hundred and seventy ° C. is 400~700k
It is preferably characterized in that it is g / mm ² .

Furthermore, it is preferable that the embossed recesses on the surface of the surface protective layer are subjected to wiping processing, and then a top coat layer is provided.

[0009]

1 is a sectional view showing an embodiment of the decorative sheet of the present invention, FIG. 2 is a sectional view showing another embodiment of the decorative sheet of the present invention, and FIG. 3 is a sectional view of the decorative sheet of the present invention. It is sectional drawing which shows other Examples, 1 is a coextrusion film, 1
a is a copolyester resin layer having thermal adhesiveness and flexibility, 1b is a colored polyester resin layer, 2 is a printing layer, 2
a is a solid printing layer, 2b is a pattern printing layer, 3 is an acrylic resin film, 4 is an embossed recess, 5 is a wiping ink layer, and 6 is a top coat layer.

As shown in FIG. 1, the structure of the decorative sheet of the present invention is a copolyester resin layer (hereinafter referred to as a copolyester resin layer) 1a having thermal adhesiveness and flexibility.
The printed layer 2 is formed on the surface of the copolyester resin layer 1a of the coextruded film 1 including the colored polyester resin layer 1b and the colored polyester resin layer 1b, and the concave portion 4 formed by embossing is formed on the upper surface of the printed layer 2.
The print layer 2 is composed of a solid print layer 2a and a pattern print layer 2b.

As shown in FIG. 1, the coextrusion film 1 used in the decorative sheet of the present invention has a two-layer structure of a copolyester resin 1a and a colored polyester resin 1b. The colored polyester resin 1b is opaque,
It has excellent strength, heat resistance, and dimensional stability and is suitable for use as a substrate. However, it has a high melting point and is difficult to emboss, and has poor adhesiveness with the printing layer. Therefore,
By interposing the copolymerized polyester resin layer 1a between the colored polyester resin layer and the printing layer, the adhesiveness of these layers and the embossability of the surface are improved at the same time, and thus such a layer structure is particularly preferable.

The coextruded film 1 is prepared by adding a copolyester resin and a colored polyester resin containing a coloring pigment such as calcium carbonate, titanium oxide or barium sulfate for imparting opacity to separate extruders. The coextruded film of the present invention can be obtained by a means of laminating after stretching, preferably before stretching, and stretching the laminated unstretched sheet in the machine direction and / or the transverse direction.

As the polyester resin used in the colored polyester resin layer in the present invention, aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid or esters thereof, ethylene glycol, 1,
It is a polyester produced by polycondensation with glycols such as 4-butanediol and neopentyl glycol. These polyesters are obtained by directly reacting an aromatic dicarboxylic acid with a glycol, and then subjecting an alkyl ester of an aromatic dicarboxylic acid to a glycol with an ester exchange reaction followed by polycondensation, or a diglycol ester of an aromatic dicarboxylic acid. Can be produced by a known method such as polycondensing. Typical examples of such polyesters include polyethylene terephthalate, polybutylene terephthalate, and polyethylene-terephthalate.
2,6-naphthalate and the like can be mentioned. The polyester may be a homopolymer or a copolymer of the third component.

The copolyester resin is an organic solvent-soluble polymer in which 95 to 50 mol% of the acidic component is terephthalic acid residue and 20 to 70 mol% of the alcohol component is ethylene glycol residue. The remaining 5 to 50 mol% of the acidic component consists of residues of adipic acid, sebacic acid and other aliphatic dibasic acids, isophthalic acid, orthophthalic acid, diphenyldicarboxylic acid and the like. The remaining 80 to 30 mol% of the alcohol component is 1.2-propylene glycol, 1.3-propylene glycol, 1.3-butanediol, 1.4-butanediol, diethylene glycol, triethylene glycol, dipropylene glycol, neopentyl. Consists of residues such as glycol.

Coextrusion film 1 used for a decorative sheet
The thickness of the colored polyester resin layer 1b is not particularly limited, but is preferably in the range of 75 to 150 μm in view of post-processability such as V-cut and lapping, material cost, etc., and the thickness of the colored polyester resin layer 1b is embossed. It is desirable that the thickness is as thin as possible in consideration of the shapeability, but it is preferably in the range of 25 to 50 μm in consideration of the concealing property as the base sheet.

The pattern print layer 2b is provided with a print that expresses, for example, a wood grain, a stone grain, a surface pattern of natural leather, a texture, an abstract pattern, etc., and is well known as a vehicle of ink for providing an arbitrary pattern. However, the use of urethane-based ink provides good adhesion and thermal adhesion. In order to further enhance the design, it is preferable to emboss the embossed pattern on the printing layer surface.

As shown in FIG. 2, a surface protective layer made of a transparent acrylic resin film 3 is sequentially provided on the printed layer 2, and an embossed concave portion 4 is formed on the surface of the acrylic resin film 3 by embossing. There is a configuration provided. A transparent film is used as the acrylic resin film 3 as the surface protective layer for protecting the printing ink layer. Compared with the copolyester resin layer and the polyvinyl chloride film, weather resistance, cold resistance, Excellent heat resistance and stain resistance. What is more important is that no chlorine group is contained in the molecule and that embossing is good. The acrylic resin used as the acrylic resin film is mainly composed of acrylic acid (including methacrylic acid) and its derivatives such as acrylic ester, acrylamide,
It is an acrylic resin obtained by polymerizing acrylonitrile, and an acrylic copolymer resin with other monomers such as styrene.

In the embossing process, the coextrusion film 1 and the acrylic resin film 3 are passed through the heat rolls which are pressed against each other with the coextrusion film 1 and the acrylic resin film 3 superposed on each other and heat-sealed to produce a single composite sheet. By pressing while heating, the acrylic resin film 3 is fused to the pattern printing layer surface 2b of the stretched polyester laminated film 1 to make one decorative sheet. If a conduit embossing roll is used as the doubling heat roll, doubling and embossing can be performed simultaneously. The steps such as doubling and embossing can be performed under the same conditions as those for a normal polyvinyl chloride film.

Further, as shown in FIG. 3, there is a constitution in which the embossed concave portion 4 on the surface of the acrylic resin film 3 is filled with the wiping ink 5 and then the top coat layer 6 is provided. As the wiping ink 5 filled in the embossed recesses 4 of the transparent acrylic resin film 3, paint or ink is used. For example, synthetic resins such as natural resins or modified resins thereof, cellulose derivatives, polyvinyl chloride resins, acrylic resins, polyester resins, polyurethane resins are used as constituent materials of the vehicle, and coloring pigments and constitutions are contained in the vehicle. A paint or ink containing a pigment, a plasticizer, etc. is used. The vehicle used is preferably a two-component curable urethane resin. The wiping method may be any conventionally used wiping method such as a doctor blade method or a roll coating method.

The top coat layer 6 may be colorless and transparent, or colored and transparent, or may be matte and transparent, and is provided for adjusting the glossiness of the surface of the decorative sheet. However, it also has a role of surface protection. The top coat layer 6 is formed by applying a paint using an appropriate vehicle, and the vehicle is a phenol resin,
One or a mixture of two or more thermosetting resins such as unsaturated polyester resin, epoxy resin and polyurethane resin can be used. The top coat layer 6 is usually formed by dispersing an appropriate amount of a matting agent to give a desired glossiness. Examples of the matting agent include mica, silica, alumina,
Calcium carbonate, diatomaceous earth, silica sand, shirasu balloon, etc. are used. As a method for applying the above-mentioned paint, a method such as gravure coating, roll coating, air knife coating, etc. is used.

This decorative sheet is applied to various fields such as various kinds of furniture and interior materials for construction, and when it is desired to form a wooden decorative material from this decorative sheet,
First, this decorative sheet is sent to the adhesive applying step, and the adhesive is applied by the well-known curved surface laminator provided in the applying step. Then, after this, the decorative sheet is curvedly laminated on a wooden base material to obtain a wooden decorative material as a polyvinyl chloride resin substitute product.

[0022]

【Example】

Example 1 A biaxially stretched polyester laminated film in which a 50 μm copolymerized polyester resin layer and a 25 μm colored polyester resin layer were laminated was used, and an ink made of a urethane resin was used on the surface of the copolymerized polyester resin layer. The colored solid print layer and the wood grain pattern print layer were printed in-line by a gravure rotary press. Then, a transparent acrylic resin film having a thickness of 25 μm and the printed grain surface of the biaxially stretched polyester laminated film having a wood grain pattern printed thereon are overlaid, and heating conditions are 170 ° C., speed is 20 m / min, and nip pressure is 25 kg / cm A decorative sheet having embossed concave portions was obtained by pressure bonding between the embossing roll and the silicone rubber roll under the conditions of ² and heat lamination.

Example 2 A two-component curing type urethane coloring ink was applied by a roll coating method to a transparent acrylic resin film surface having a concave portion formed by the embossing on its surface, and then adhered to a portion other than the concave portion with a doctor blade. The colored ink on the laminated sheet was removed, and the colored ink was filled in the recess formed on the surface of the laminated sheet and solidified. Further, a urethane two-component curing type topcoat coating material was coated on this sheet with a gravure roll having a plate depth of 60 μm to obtain a doubling wiping decorative sheet with high design and processability.

[0024]

Since the cosmetic sheet of the present invention is constructed as described above, no toxic gas such as hydrogen chloride gas is generated at the time of incineration, and environmental problems can be eliminated. Since the polymer does not contain a plasticizer as in the case of the vinyl chloride film, the problem associated with bleed-out of the plasticizer can be eliminated. Since the base material is a laminate of a copolyester resin layer having thermal adhesiveness and flexibility and a colored polyester resin layer having heat-resistant dimensional stability, it has excellent embossability and is sharp and can be applied to the back surface of the sheet. The embossed recesses that are less likely to come off can be expressed, and the excellent design can be obtained.

By forming a transparent acrylic resin film as the surface protective layer, a decorative sheet with excellent weather resistance can be obtained and can be used for exterior applications such as surface materials for entrance doors. Is.

Further, it can be manufactured by the same manufacturing method and conditions as a decorative sheet using a vinyl chloride film, and it does not require wasteful equipment investment such as addition of new equipment or modification of equipment.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a decorative sheet of the present invention.

FIG. 2 is a sectional view showing another embodiment of the decorative sheet of the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the decorative sheet of the present invention.

[Explanation of symbols]

 1 Coextrusion Film 1a Copolymerized Polyester Resin Layer 1b Colored Polyester Resin Layer 2 Printing Layer 2a Solid Printing Layer 2b Pattern Printing Layer 3 Acrylic Resin Film 4 Embossing Recess 5 Wiping Ink Layer 6 Topcoat Layer

Claims (4)

[Claims] 1. A printing layer is provided on the surface of the copolyester resin layer of a coextrusion film having a structure in which a copolyester resin layer having thermal adhesiveness and flexibility and a colored polyester resin layer are laminated, and the print layer is provided. A decorative sheet having an uneven pattern formed by embossing on its surface. 2. A printed layer and a transparent acrylic resin on the surface of the copolyester resin layer of a coextrusion film having a structure in which a copolyester resin layer having thermal adhesiveness and flexibility and a colored polyester resin layer are laminated. A decorative sheet, wherein a surface protective layer made of a film is sequentially provided, and an uneven pattern formed by embossing is formed on the surface of the surface protective layer. 3. The softening temperature of the copolyester resin layer having thermal adhesiveness and flexibility of the coextrusion film is 1 or less.
Tensile Young's modulus is 1 to 30 kg / mm at 50 to 200 ° C
² and the colored polyester resin layer has a softening temperature of 23.
Tensile Young's modulus of 400 to 700 kg / at 5 to 270 ° C
The decorative sheet according to claim 1, wherein the decorative sheet has a size of mm ² . 4. The layer having an uneven pattern formed by embossing is subjected to a wiping process, and then a top coat layer is provided.
The decorative sheet according to item 3.