JPH09314773A - Decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a decorative sheet which has adequate elongation at which the formation of a V cut is possible, resistance against tearing, pliability and enhanced design properties to be available by printing, by making a polyolefin resin sheet with a specified coefficient of thermal size shrinkage ornamental. SOLUTION: When using a polyolefin resin sheet, it is of such a type that the coefficient of size shrinkage after heating in a 100 deg.C atmosphere for 30min. ranges from -2to +7% in the longitudinal direction of the sheet and ranges from -7 to +2 in the width direction, when it comes to a long band-like sheet. The method for making the sheet ornamental is to color the sheet by adding pigment 2, print a pattern 5, and shape the sheet into an uneven pattern 7 by embossing or hairline conversion. In addition, if it is required to further increase the adhesion between ink or an adhesive and a polyolefin resin sheet 1, the surface of the polyolefin resin sheet 1 is coated with an easily adherent layer 4, and is treated by a corona discharge method and a plasma treatment method for easy adhesion.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention can be used as a surface decorative sheet used for interior decoration of buildings, surface makeup of fittings, interior decoration of vehicles, and the like.

[0002]

2. Description of the Related Art Conventionally, the following two types of decorative sheets have been mainly used as decorative sheets for such purposes.

(1) Polyvinyl chloride film is used and is decorated by printing, embossing or the like. (Japanese Patent Publication No. 28-5036, Japanese Patent Publication No. 58-14312) (2) A normal polyolefin film obtained by stretching a film of polyethylene, polypropylene or the like at a stretching ratio of 3 to 5 is used. (JP-A-54-62255)

[0004]

The decorative sheet using the polyvinyl chloride film as described in (1) has insufficient heat resistance or cannot be incinerated for disposal (hydrogen chloride gas is generated during combustion). Therefore, there is a problem that the stain resistance of the surface is poor due to bleeding (exudation) of the plasticizer.

Further, in the conventional decorative sheet as described in (2), such a drawback of polyvinyl chloride can be improved, but it is not flexible. It has low elongation and tear propagation resistance, and cracks during V-cut processing. In particular, crystallization progresses due to the heat history at the time of embossing from heating softening to embossing plate pressing to cooling, the sheet becomes brittle, and this tendency is strengthened. Since the crystallinity is high, the embossing conditions are very narrow. There was a problem.

[0006]

In order to solve the above problems, in the present invention, the heating dimensional shrinkage is 100 °.
The dimensional shrinkage ratio after heating in a C atmosphere for 30 minutes (before heating) is −2 to +7 in the longitudinal direction of the long sheet.
%, The decorative sheet is characterized by a decorative treatment on a polyolefin resin sheet having a sheet width direction in the range of -7 to + 2%, and an acrylic resin, ethylene / vinyl alcohol copolymer weight A decorative sheet has been developed which is characterized by laminating a transparent resin sheet selected from either a united resin or a thermoplastic polyester resin.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing an example of a decorative sheet according to the present invention. FIG. 2 is a sectional view showing an application example of the decorative sheet according to the present invention. FIG. 3 is a sectional view showing an application example of the decorative sheet according to the present invention.

The polyolefin resin in the present invention includes polyethylene, ethylene / propylene copolymer, ethylene / butene-1 copolymer, polypropylene, propylene / butene-1 copolymer, polybutene-1, butene-.
1, propylene / ethylene / terpolymer, butene-1
-Hexene-1, octene-1, terpolymer, polymethylpentene, olefin elastomers described in JP-A-6-16832, etc. are used. The thickness is about 50 to 500 μm.

These polyolefin resins can be used by themselves, but various rubbers are preferably added in order to impart flexibility, impact resistance and easy adhesion to the polyolefin resin. Examples of the rubber include a diene rubber, a hydrogenated diene rubber, and an olefin elastomer. Among them, a hydrogenated diene rubber is preferable.

The hydrogenated diene rubber is obtained by adding a hydrogen atom to at least a part of the double bond of the diene rubber molecule, and is used as a modifier for the polyolefin resin in the present invention. It has the role of suppressing crystallization of the polyolefin resin and improving flexibility and transparency. In general, when a diene rubber is added to a polyolefin resin, the weather resistance and heat resistance are lower than those of the diene rubber-free polyolefin resin due to the double bond of the diene rubber. Since the double bond is saturated with hydrogen, weatherability and heat resistance of the polyolefin-based resin are not deteriorated and the polyolefin resin becomes good.

As the diene rubber, isoprene rubber,
Examples include butadiene rubber, butyl rubber, propylene / butadiene rubber, acrylonitrile / butadiene rubber, acrylonitrile / isoprene rubber, and styrene / butadiene rubber. For the purpose of the present invention, styrene-butadiene rubber is particularly preferable. The addition amount is about 1 to 90 parts by weight with respect to 100 parts by weight of the polyolefin resin.

If the amount is less than 1 part by weight, elasticity due to rubber addition,
Elongation rate and impact resistance are insufficient, and cracks and cracks are likely to occur during bending such as V-cutting and drawing. Also 90
If it is more than weight part, elasticity and elongation become too large,
Registration during printing becomes poor, which is not preferable.

There is a correlation between the dimensional shrinkage upon heating and the cracking / breaking resistance during bending such as V-cutting. The "polyolefin resin sheet" used in the present invention is heated for 30 minutes in an atmosphere of 100 ° C. Dimensional shrinkage after heating (based on before heating), that is, [(dimension after heating)-(dimension before heating)] × 100 /
(Dimension before heating) = Shrinkage rate of heating dimension (%) In the case of a long belt-shaped sheet, the sheet longitudinal direction is -2 to +
7% and the sheet width direction is in the range of -7 to + 2%. If the dimensional shrinkage ratio deviates from this range, the elongation ratio and the tear propagation resistance are significantly reduced with respect to the impact strength, and the sheet is subjected to impactal bending,
It is not preferable because cracks are easily generated during V-cut processing.

The reason why the allowable value of the heating dimensional shrinkage ratio is different between the longitudinal direction and the width direction of the sheet is that the mechanical history of the sheet at the time of manufacturing the sheet and the method of applying the impact force at the time of processing the sheet. This is because the length direction differs from the width direction.

The dimensional shrinkage upon heating has a large correlation mainly with the stretching of the polyolefin resin sheet. The lower the draw ratio, the closer the heating dimensional shrinkage is to 0. In the case of polypropylene, the draw ratio in the longitudinal direction of the sheet is 0 times or more and less than 3 times,
When the stretching ratio in the sheet width direction is 0 times or more and less than 3 times,
Generally, the heating dimensional shrinkage falls within this range. However, generally, when the draw ratio is increased, the transparency and tensile strength of the sheet are improved. Therefore, the stretching ratio is set to an appropriate value in the above range according to the required degree of transparency and tensile strength. When the draw ratio exceeds 3 times, the heating dimensional shrinkage ratio deviates from this range. The dimensional shrinkage upon heating is also correlated with the presence or absence of side chains (branches) of the molecule and the stereoregularity (symmetry) of the molecule. The smaller the number of side chains (branches) of the molecule, the lower the dimensional shrinkage upon heating. In the case of polyethylene, the low-pressure polyethylene has less side chains than the high-pressure polyethylene, and therefore the shrinkage rate upon heating is small and good. Regarding the steric regularity of the molecule, the higher the regularity, the lower the dimensional shrinkage upon heating. Hydrocarbon skeleton (main chain) like polypropylene
In the case of a molecular structure having a functional group such as methyl group, isotactic or syndiotactic has a smaller dimensional shrinkage upon heating and is better than atactic.

If necessary, pigments, dyes, fillers, flame retardants, ultraviolet absorbers, etc. are added to the polyolefin resin sheet.

Although it is possible to directly print a pattern on the polyolefin resin sheet itself or to apply an adhesive,
If it is necessary to make the adhesive force between the ink or adhesive and the polyolefin resin sheet stronger, apply an easy-adhesion layer on the polyolefin resin sheet surface, such as corona discharge treatment and plasma treatment. Give.

In the decorative sheet of the present invention, acrylic, vinyl chloride-vinyl acetate copolymer, polyester, polyurethane, chlorinated polypropylene and chlorinated polyethylene are used as the easily adhesive layer (also referred to as primer layer or anchor layer). However, chlorinated polypropylene is particularly preferable. As an example of forming the easy-adhesion layer, the easy-adhesion layer 4 is provided between the polyolefin resin sheet 1 and the pattern layer 5.
FIG. 1 (B) shows the case where the above is provided. As another example, FIG. 3A shows a case where the easy-adhesion layer 4 is provided between the polyolefin resin sheet 1 and the adhesive layer 30 on the adherend side.

As the acrylic, methyl poly (meth) acrylate, ethyl poly (meth) acrylate, propyl poly (meth) acrylate, butyl poly (meth) acrylate, methyl (meth) acrylate / (meth) acrylic Butyl acid copolymer, ethyl (meth) acrylate / butyl (meth) acrylate copolymer, ethylene / methyl (meth) acrylate copolymer, styrene / methyl (meth) acrylate copolymer ) An acrylic resin composed of a homopolymer or a copolymer containing an acrylic ester (provided that (meth) acrylic means acrylic or methacrylic, and the same applies hereinafter).

Polyurethane is mainly composed of polyol (polyhydric alcohol) and isocyanate as a crosslinking agent (curing agent).
And polyurethane.

The polyol has two or more hydroxyl groups in the molecule, for example, polyethylene glycol, polypropylene glycol, acrylic polyol,
Polyester polyol, polyether polyol and the like are used.

As the isocyanate, 2 in the molecule is used.
A polyvalent isocyanate having one or more isocyanate groups is used. For example, aromatic isocyanate such as 2-4 tolylene diisocyanate, xylene diisocyanate and 4-4 diphenylmethane diisocyanate, or aliphatic (or alicyclic) such as hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate and hydrogenated diphenylmethane diisocyanate. Group) isocyanates are used.

The decoration treatment means coloring (transparent or opaque coloring) by adding a pigment as shown in FIG. 1 (A), and FIG. 1 (B).
1) printing of a pattern as shown in FIG. 1, embossing (heating press) as shown in FIG. 1C, shaping of an uneven pattern by hairline processing, and the like.

As pigments, titanium white, zinc white, red iron oxide,
Inorganic pigments such as vermilion, ultramarine blue, cobalt blue, titanium yellow, graphite, carbon black, etc .; Dyes), metal pigments such as aluminum, brass, etc., pearlescent (pearl) pigments composed of foil powder such as titanium dioxide-coated mica, basic lead carbonate, etc., depending on the application, transparent coloring pigments or opaque colorings Choose one of the pigments.

These are added and dispersed as powder or scale-like foil pieces.

As the pattern printing, a pattern is formed by ink (or paint) using a known printing method such as gravure printing, offset printing, silk screen printing, and transfer printing from a transfer sheet.

As the pattern, there are a wood grain pattern, a stone grain pattern, a cloth grain pattern, a leather pattern, a geometrical figure, a character, a symbol, or a solid surface. The pattern is on the front, back, both sides of the sheet,
Alternatively, it is provided between layers.

As the ink (or) paint, chlorinated polyolefins such as chlorinated polyethylene and chlorinated polypropylene, polyester, polyurethane, acrylic, vinyl acetate, vinyl chloride / vinyl acetate copolymer, cellulose resin, etc. are used as binders. And used alone or in combination of two or more. A material obtained by adding known pigments as described above to this is used.

When printing directly on a polyolefin resin, chlorinated polyolefin, polyurethane or the like is preferable as a binder from the viewpoint of adhesiveness, but if an easily-adhesive primer is appropriately selected and formed into a layer, another binder is used. Even give sufficient adhesion.

The embossing is carried out by heating and softening the polyolefin resin, pressing and shaping it with an embossing plate, cooling and fixing, and a known sheet-fed or rotary embossing machine is used.

Examples of the uneven shape include a wood grain board conduit groove, a stone board surface unevenness (granite cleavage plane, etc.), a cloth surface texture, a satin finish, a grain, a hairline, a linear groove, and the like.

Further, if necessary, the concave portions of the concavo-convex pattern can be filled with a coloring ink by a known wiping method (see Japanese Patent Publication No. 58-14312). The same thing as the above can be used for the coloring ink. However, from the viewpoint of abrasion resistance, a material using a two-component curable urethane resin as a binder is preferable.

The metal thin film is made of aluminum, chromium, gold,
A film is formed by a method such as vacuum evaporation and sputtering using a metal such as silver or copper. Alternatively, a combination of these may be used.
The metal thin film may be provided on the entire surface or partially in a pattern.

Next, the decorative sheet of claim 2 is as shown in FIG.
As shown in (C), the polyolefin resin sheet 1 is laminated with a resin sheet 34 other than polyolefin. As the resin other than the polyolefin, one selected from acrylic resin, ethylene / vinyl alcohol copolymer resin, and thermoplastic polyester resin is used. Here, as the acrylic resin, poly (meth) acrylic acid methyl, poly (meth) acrylic acid ethyl, poly (meth) acrylic acid propyl, poly (meth) acrylic acid butyl, methyl (meth) acrylic acid
Butyl (meth) acrylate copolymer, ethyl (meth) acrylate / butyl (meth) acrylate copolymer, ethylene / methyl (meth) acrylate copolymer, styrene
It is an acrylic resin composed of a homopolymer or a copolymer containing a (meth) acrylic acid ester such as a methyl (meth) acrylate copolymer. The thickness of this acrylic resin sheet is
It is about 20 to 100 μm.

The ethylene / vinyl alcohol copolymer layer is laminated by heat melting, or a two-component curing type urethane resin, a melt extrusion (extrusion) coated adhesive such as polyethylene, is used for the ethylene / vinyl alcohol copolymer layer. It is formed by laminating a united film on a resin layer serving as a base material, and has a thickness of 10 to 100 μm.
Is preferably, and more preferably 12 to 25 μm. As the film, a film obtained by molding a random copolymer of ethylene and vinyl alcohol into a film is generally used.

The ethylene / vinyl alcohol copolymer-based resin film may be either a stretched film or an unstretched film. However, the unstretched film is preferable in view of film flexibility, bending workability, embossing suitability and the like. It is preferably used.

The ethylene / vinyl alcohol copolymer film can be made to have the thermoplasticity and water resistance of ethylene and the rigidity, oil resistance, solvent resistance and chargeability of vinyl alcohol by changing the ratio of the copolymerization components. Although the size of the performance can be adjusted arbitrarily, the ethylene component is preferably 30 to 45 mol% in order to obtain a film having both features as much as possible and excellent processability. If it is less than 30 mol%, the thermoplasticity, heat processing suitability and water resistance are inferior, and if it exceeds 45%, the rigidity, oil resistance, solvent resistance, and antistatic properties are inferior.

The thermoplastic polyester resin is typified by polyethylene terephthalate, polybutylene terephthalate, ethylene / terephthalate / isophthalate copolymer and the like, and the acid component includes terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid and the like. It is a copolymer obtained as an ester of both an aromatic dicarboxylic acid and an aliphatic diol such as ethylene glycol, diethylene glycol, butanediol or hexanediol as an alcohol component.

Either a stretched or unstretched sheet can be used, but an unstretched sheet is preferable in terms of suitability for embossing and suitability for molding such as V-cut processing.

[Ultraviolet Absorber / Light Stabilizer] In order to impart better weather resistance (light resistance) to the resin, an ultraviolet absorber and / or a light stabilizer can be added. The amount of both the absorber and the light stabilizer is usually about 0.5 to 10% by weight, but it is generally preferable to use the ultraviolet absorber and the light stabilizer together. As the ultraviolet absorber, an organic substance such as benzotriazole, benzophenone, and salicylate, or an inorganic substance such as zinc oxide, cerium oxide, and titanium oxide in the form of fine particles having a diameter of 0.2 μm or less can be used. As a light stabilizer, bis- (2,2,6,
Radical scavengers such as hindered amine radical scavengers such as 6-tetramethyl-4-piperidinyl) sebacate and piperidine radical scavengers can be used.

The above ultraviolet absorbers / light stabilizers are common to acrylics, ethylene / vinyl alcohol copolymers, polyesters and polyolefins. As a filler,
Powders such as calcium carbonate, barium sulfate, clay and talc are used. Add an appropriate amount as needed. As the flame retardant, powders such as aluminum hydroxide and magnesium hydroxide are used, and these are added when it is necessary to impart flame retardancy. Polyolefin resin 100 is added
It is about 10 to 150 parts by weight with respect to parts by weight.

On the surface of the decorative sheet according to claim 1, acrylic resin, ethylene / vinyl alcohol copolymer resin,
Alternatively, as a method for laminating a transparent resin sheet selected from any of thermoplastic polyester resins, melt extrusion coating (extrusion coating), fusion by hot pressing, or two-component curing type polyurethane resin, polyester resin, etc. For example, by dry laminating using the adhesive.

The decorative sheet is a single layer (FIG. 1) that has been subjected to a decoration treatment, a two-layer laminated polyolefin resin sheet (FIG. 2), a polyolefin resin sheet and an acrylic resin, an ethylene / vinyl alcohol copolymer. It is possible to use a laminate of transparent resin sheets other than a polyolefin selected from a resin or a thermoplastic polyester resin [FIG. 3 (C)], or a laminate of three or more layers (not shown). Further, the decorative sheet of the present invention can be laminated on another adherend (lining material). In the case of lamination, the adhesive layer may be omitted when the decorative sheet itself can be adhered to the adherend (by heat melting point etc.) [Fig. 3 (B)], and the decorative sheet itself adheres to the adherend. If not, they are laminated with an appropriate easy-adhesion layer and an adhesive layer interposed therebetween (FIG. 3 (A)).

The adherend is a final product, and a decorative sheet may be laminated for the surface decoration. If necessary, the decorative sheet may be used to reinforce the mechanical strength of the decorative sheet or to provide concealment. An adherend may be laminated on the back surface.

As the adherend, plate materials such as flat plates and curved plates of various materials [FIG. 3 (A)], three-dimensional shaped articles [molded products, FIG.
(B)], a sheet (or a film) and other various shaped articles are targeted. As a material used for any of a plate material, a three-dimensional article, and a sheet (film), wood veneer such as wood veneer, wood plywood, particle board, medium density fiber board (MDF), wood fiber board such as wood fiber board , Metals such as iron and aluminum, acrylic, polycarbonate, ethylene / vinyl acetate copolymer, ethylene vinyl acetate, polyester, polystyrene, polyolefin, A
Materials such as BS, phenol resin, polyvinyl chloride, cellulosic resin, rubber and the like, materials exclusively used for plate materials or three-dimensional articles include ceramics such as glass and ceramics, cement such as ALC (foam lightweight concrete), Non-cement ceramic materials such as calcium silicate, gypsum,
Materials used exclusively as sheets (or films) include papers such as high-quality paper and Japanese paper, non-woven fabrics or woven fabrics made of fibers such as carbon, asbestos, potassium titanate, glass, and synthetic resin.

As a method for laminating these various adherends,
For example, as described in JP-B-50-19132, JP-B-43-27488, and the like, a decorative sheet is a method of laminating a plate-like substrate by pressing with a pressure roller via an adhesive layer therebetween. Between the male and female molds for injection molding,
The two molds are closed, the molten resin is injected and filled from the male mold gate, and then cooled, and a decorative sheet is adhered and laminated on the surface of the molded resin simultaneously with the molding of the molded resin. No. 45768, Japanese Patent Publication No. 60-
As described in JP-A-58014, etc., a decorative sheet is placed on the surface of a molded product so as to face or be placed with an adhesive layer in between.
A so-called vacuum press lamination method in which a decorative sheet is laminated on the surface of a molded product by a pressure difference caused by vacuum suction from the molded product side,
As described in Japanese Examined Patent Publication No. 61-5895, Japanese Examined Patent Publication No. 3-2666, etc., a decorative sheet is supplied in the major axis direction of a columnar substrate such as a column or a polygonal column with an adhesive layer interposed therebetween. On the other hand, a decorative sheet is sequentially pressure-bonded and laminated on a plurality of side faces forming a columnar body by a plurality of rollers having different orientations, a so-called lapping method, actual size 15-31.
No. 122, JP-A-48-47972, etc., a decorative sheet is first laminated on a plate-shaped substrate with an adhesive layer interposed therebetween, and then the plate-shaped substrate opposite to the decorative sheet. A groove having a V-shaped or U-shaped cross section, which reaches the interface between the decorative sheet and the plate-shaped base material, is cut on the surface of, and then an adhesive is applied to the groove, and then the groove is bent. There is a so-called V-cut or U-cut processing method for forming a box body or a columnar body.

In particular, as a method of bonding the decorative sheet of the present invention to a three-dimensional object having irregularities, of the above methods, (a) a lapping method, (b) a V-cut method, (c) a simultaneous lamination method of injection molding, d) A vacuum forming simultaneous lamination method or the like is preferable.

The decorative sheet of the present invention is laminated on various adherends, subjected to predetermined molding and the like and used for various purposes. For example, interior decoration of buildings such as walls, ceilings and floors, surface decoration of fittings such as window frames, doors, handrails, surface decoration of cabinets of furniture or light electric / OA equipment, vehicle interiors such as automobiles and trains, aircraft interiors, windows Glass makeup.

[0049]

EXAMPLES Examples of the present invention will be described in detail below.

Example 1 Based on 100 parts by weight of polypropylene, 10 parts by weight of styrene-butadiene rubber, 3 parts by weight of a hindered amine type radical scavenger, and 2 parts by weight of a benzotriazole type ultraviolet absorber were added to make a transparent film having a thickness of 80 μm. Unstretched sheet (top sheet) surface is corona treated, hexamethylene diisocyanate is used as a curing agent, urethane-based two-component curable resin containing acrylic polyol as a main component is used as a binder, and a pigment is added to this to make a zelkova board. The pattern was gravure-printed, and a chlorinated polypropylene-based primer was further used to form an easy-adhesion primer layer having a thickness of 3 μm by a gravure coating method.

The decorative sheet obtained above was made so that the primer surface was on the side of the base sheet, and 10 parts by weight of styrene-butadiene rubber was used as a base based on 100 parts by weight of polyethylene. Using a rotary type hot press embossing machine, stacking with a valve sheet and a carbon black-added base material sheet having a thickness of 80 μm,
Both sheets were laminated and adhered. At that time, laminate (nip)
Of the rolls, the roll that comes to the surface sheet side is a metal roll, and as a embossing roll formed by forming irregularities of a wood grain conduit groove on the surface, a decorative sheet and an adherend base material are laminated, and at the same time, a decorative sheet The surface is embossed with an uneven pattern. The embossing conditions were as follows: Emboss sheet heating temperature: 165 ° C (heating drum temperature) Sheet feed speed: 15 m / min Emboss plate surface temperature: 40 ° C

Example 2 A sheet of polyethylene resin prepared by adding red peony, titanium white, and yellow lead as pigments to give a tan color, and adding 10 parts by weight of styrene-butadiene rubber was prepared. In addition, after performing corona discharge treatment, using hexamethylene diisocyanate as a curing agent, a two-component curable polyurethane containing acrylic polyol as a main component as a binder, and a pigment added thereto, using a colored ink, full-scale solid printing and cedar printing Grain-printed grain pattern. On top of that, 10 g of a two-component curing type polyurethane adhesive containing hexamethylene diisocyanate as a curing agent and acrylic polyol as a main component
/ M ² (during drying), the diluted solvent was dried, and a benzotriazole-based ultraviolet absorber as a surface sheet was added thereto in an amount of 2% by weight. A transparent acrylic resin sheet made of poly (methylmethacrylate) having a thickness of 50 μm was laminated, pressed, and cured in an atmosphere of 40 ° C. for 4 days to crosslink and cure the printing ink and the adhesive to obtain a decorative sheet.

Example 3 The same as Example 2 except that an unstretched sheet made of a transparent ethylene / vinyl alcohol copolymer having a thickness of 50 μm containing 2% by weight of a benzotriazole type ultraviolet absorber was used as the surface sheet. Makeup sheet.

Example 4 Example 2 was repeated except that an unstretched sheet made of a transparent ethylene / terephthalate / isophthalate copolymer having a thickness of 50 μm and containing 2% by weight of a benzotriazole type ultraviolet absorber was used as the surface sheet. A decorative sheet similar to.

Comparative Example 1 10 parts by weight of an olefinic elastomer was added as the surface sheet and base sheet of Example 1 and the stretching ratio was 3 times 2.
A 80 μm thick sheet of axially oriented polypropylene was used. Others were the same as Example 1.

Comparative Example 2 As the top sheet and base sheet of Example 1, 80-μm-thick sheets of biaxially oriented polypropylene with a rubber material-free additive and a draw ratio of 5 were used. Others were the same as Example 1.

[Performance Evaluation Test] Table 1 shows the results of comparison between the decorative sheets of Examples 1 to 4 and the decorative sheets of Comparative Examples 1 and 2 in various physical properties.

[Test Method] 1. Transparency The haze value is measured with a direct-reading haze meter manufactured by Toyo Seiki Co., Ltd. The measurement is performed on a single layer of the polyolefin resin sheet layer without decoration treatment. 2. Irradiation up to 3000 hours with a carbon arc lamp type sunshine weatherometer, stop at a place where visual changes such as cracks, whitening, discoloration, etc. become significant (visual judgment). Black panel temperature 63 ° C. The sample after irradiation is visually evaluated. 3. Heat resistance Heat in an 80 ° C atmosphere for 3 minutes, and visually check the discolored state before and after the heating. 4. Sheet break / crack during V-cut The base sheet side of the decorative sheet is bonded and laminated to a 10mm-thick Rawan plywood using an ethylene-vinyl acetate copolymer emulsion adhesive, and the decorative sheet side of the plywood is On the other side, a V-shaped groove extending to the interface between the plywood and the adhesive layer is cut, and an adhesive of an ethylene / vinyl acetate copolymer emulsion is applied to the groove, and the groove is formed. The plywood was bent in a closed manner so that the plywood was bent into an L-shape (cross section). The ambient temperature during processing was 10 ° C. 5. Reproduction of uneven pattern Evaluation was made visually. 6. Adhesive force A sample obtained by cutting a laminate of a decorative sheet / base sheet or a face sheet / decorative sheet into a width of 1 cm was pulled in a direction perpendicular to the width direction at a pulling speed of 50 mm / min and an ambient temperature of 2.
At 0 ° C., a tensile test was performed so that the tensile directions of both samples were 180 ° to each other, and the tension at the time of peeling of the interlayer interface was measured. 7. Heating dimensional shrinkage ratio The decorative sheet is heated in an atmosphere of 100 ° C. for 30 minutes, and [(dimension after heating) − (dimension before heating)] × 100 /
(Dimension before heating) = Shrinkage ratio of heating dimension (%) was determined for each of the longitudinal direction (MD) and the width direction (TD).

[0059]

[Table 1]

[0060]

EFFECTS OF THE INVENTION The decorative sheet of the present invention has V-cut processable elongation, tear resistance, and flexibility, has good heat resistance, and can be printed to improve its design. Produce an effect. Excellent embossing suitability compared to general olefin-based films. When the decorative sheet is burned, there is an effect that harmful chlorine-based gas is not generated unlike the conventional polyvinyl chloride.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a decorative sheet according to the present invention.

FIG. 2 is a sectional view showing an application example of a decorative sheet according to the present invention.

FIG. 3 is a cross-sectional view showing another application example of the decorative sheet according to the present invention.

[Explanation of symbols]

 1 Polyolefin Resin Sheet 2 Pigment 3 Decorative Sheet 4 Easy-Adhesion Layer (Primer Layer) 5 Pattern 6 Decorative Sheet 7 Uneven Pattern 9 Decorative Sheet 10 Pattern 11 Colored Ink Wiping Filling 12 Decorative Sheet 21 Decorative Sheet 22 Decorative Sheet 23 Decorative Sheet 30 Adhesive Layer 31 Adherent (flat plate) 32 Decorative sheet 33 Adherent (uneven three-dimensional object) 34 Transparent resin sheet other than polyolefin

Claims (3)

[Claims] 1. The dimensional shrinkage after heating for 30 minutes in an atmosphere with a heating dimensional shrinkage of 100 ° C. (based on before heating) is −2 to + 7% in the longitudinal direction of the long sheet and in the width direction of the sheet. A decorative sheet comprising a polyolefin resin sheet having a range of -7 to + 2% and a decorative treatment. 2. The surface of the decorative sheet according to claim 1, further comprising a transparent resin sheet selected from any one of an acrylic resin, an ethylene / vinyl alcohol copolymer resin, and a thermoplastic polyester resin. A featured decorative sheet. 3. The decorative sheet according to claim 1, wherein the front or back surface of the polyolefin resin sheet is subjected to easy adhesion treatment such as application of an easy adhesion layer, corona discharge treatment, and plasma treatment.