JPH10119227A - Decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet wherein it is excellent in embossing aptitude by being compared with general olefin film; though it is treated by reclamation as waste without incineration, it is decomposed; though incinerated, harmful gaseous chlorine is not generated; and as a decorative material, it is free from crack and rupture even after V-cut machining and other bending, and excellent in all over durability, appearance, and ecology. SOLUTION: A sheet 1 having biodegradability or photodegradability is treated for decoration. A transparent sheet having biodegradability or photodegradability is laminated on the decorative sheet 3. For a thermal dimension shrinkage rate of the sheet 1 having biodegradability or photodegradability, the dimensional shrinkage rate after heating for 30min in an atmosphere at 100 deg.C (based on that before heating) is -2 to +7% in length direction of sheet, and -7 to +2% in width direction of sheet in the case of a long band like sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention can be used as a surface decorative sheet used for interior decoration of buildings, surface decoration of fittings, vehicle interiors, and the like.

[0002]

2. Description of the Related Art Conventionally, a decorative sheet used for such a purpose is a decorative sheet obtained by using a polyvinyl chloride film and printing or embossing the film. (Japanese Patent Publication No. 28-5036, Japanese Patent Publication No. 58-1431)
No. 2) has been used. In recent years, as an alternative to this, (1) a decorative sheet using a polyolefin-based film such as polyethylene or polypropylene has appeared. (JP-A-54-62255)

[0003]

The conventional decorative sheet as described in (1) is mass-produced industrially and is inferior in flexibility and bending workability when used as an interior material of a building and has an impact resistance. It is also weak 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. Due to high crystallinity, embossing conditions are very narrow. There was a problem. Furthermore, in the decorative sheet as described in (1), there is a problem that the unnecessary decorative sheet after use is troublesome to incinerate, and that it is not decomposed even if it is landfilled as waste. Was.

[0004]

A plastic sheet having biodegradability or photodegradability is superior in flexibility and bending workability to general polyolefin resin films. Therefore, the impact resistance is strong and there is no crack breaking during V-cut processing. Also, it has excellent embossing suitability. In the present invention, mainly in the material of the decorative sheet,
Biodegradable or photodegradable plastics and their sheets are used. This makes it possible to decompose the high-molecular compound into low-molecular compound by light or microorganisms in the soil without burning the unnecessary decorative sheet after use. This can solve pollution problems such as waste disposal and environmental pollution.

[0005] In order to solve the above-mentioned problems, the present invention provides a decorative sheet characterized by being subjected to a decoration treatment on a biodegradable or photodegradable sheet, and the surface of such a decorative sheet. They have developed a decorative sheet characterized by laminating transparent sheets having biodegradability or photodegradability.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a decorative sheet according to the present invention having a single-layer structure. FIG. 2 is a cross-sectional view showing an example of the decorative sheet according to claim 1 or 2 which has a two-layer laminated structure among the decorative sheets according to the present invention. FIG. 3 is a sectional view showing an application example of the decorative sheet according to the present invention. FIG. 4 is a cross-sectional view showing an example of the decorative material according to the present invention.

In the present invention, the biodegradable or photodegradable sheet (both the base sheet and the surface sheet) means a sheet formed from the following biodegradable plastic or photodegradable plastic.

First, as a biodegradable sheet,
Polycaprolactone, polybutylene succinate / polyethylene succinate, poly-L-lactide (poly-L
-Lactic acid) or a sheet obtained by chemically synthesizing an aliphatic polyester such as polyvinyl alcohol, a sheet prepared based on natural products such as cellulose, chitosan, lignin, starch, moisture, and grafted starch; 3-hydroxybutyrate-3-hydroxyvale Sheets made using macromolecules produced by microorganisms, such as rate copolymers, pullulan, bacterial cellulose, etc., sheets made based on polymer materials made from amino acids, sugars, polyesters, etc. by fermentation technology, etc. Is used. These are usually transparent.

Next, as a sheet having photodegradability,
A sheet made of a mixture of polyethylene and calcium carbonate, a photosensitizer, an aromatic ketone, an additive for low molecular weight photolysis such as a metal complex such as a complex with iron-acetylacetone and a complex with Ni-dibutyl-diocarbate. A film or sheet made from a light-absorbing monomer such as a film or sheet, a copolymer of carbon monoxide, a copolymer of vinyl ketones, and a polymer having an unsaturated bond. Etc. are used.

The thickness of the biodegradable or photodegradable sheet is about 50 to 500 μm, and any of a stretched sheet and an unstretched sheet can be used. Sheets are better.

If necessary, pigments, dyes, fillers, foaming agents, flame retardants, ultraviolet absorbers, etc. are added to the biodegradable or photodegradable sheet.

The biodegradable or photodegradable sheet used in the present invention has a flexural modulus of about 3000 kg / cm ² . The measuring method of flexural modulus is JIS K 7203
based on.

The biodegradable or photodegradable sheet used in the base sheet or surface sheet of the present invention has a dimensional shrinkage ratio due to heating and crack resistance during bending such as V-cut.
There is a correlation with the rupture property.
Dimensional shrinkage after heating for 1 minute (based on before heating)
However, in the case of a long strip-shaped sheet, the sheet longitudinal direction is -2 to +
7%, and the sheet width direction is preferably in the range of -7 to + 2%.
If the dimensional shrinkage ratio deviates from this range, cracks are likely to occur during V-cut processing, which is not preferable. The reason why the allowable value of the heating dimensional shrinkage ratio is different in the sheet longitudinal direction and the width direction is that the material mechanical history of the sheet at the time of sheet production, and how the impact force at the time of sheet processing is applied are different from the longitudinal direction. This is because it differs in the width direction.

The dimensional shrinkage upon heating has a great correlation with the stretching of a sheet mainly having biodegradability or photodegradability. If the film is not stretched, the heated dimensional shrinkage falls within this range, and if the film is stretched three times or more, the heated dimensional shrinkage generally falls outside this range. Therefore, when stretching, the stretching ratio is controlled so that the heating dimensional shrinkage ratio falls within the above range.

It is possible to print a pattern directly on the biodegradable or photodegradable sheet itself, or to apply an adhesive thereto. When it is necessary to further increase the adhesive strength of the sheet, the surface of the biodegradable or photodegradable sheet is subjected to an easy-adhesion treatment such as application of an easy-adhesion layer, corona discharge treatment, and plasma treatment.

In the decorative sheet of the present invention, the above-mentioned biodegradable or photodegradable plastic, acrylic, vinyl chloride-vinyl acetate copolymer, Polyester, polyurethane, chlorinated polypropylene, and chlorinated polyethylene are used. In particular, a biodegradable or photodegradable plastic of the same type as the surface sheet or the base sheet is desirable.

FIG. 1B shows a case where an easy-adhesion layer 4 is provided between a biodegradable or photodegradable sheet 1 and a pattern layer 5 as an example of an easy-adhesion layer. When the decorative sheet itself does not adhere to the adherend, the decorative sheet is laminated via an appropriate easy-adhesion layer and an adhesive layer as shown in FIG.

Examples of the acryl include poly (methyl meth) acrylate, poly (meth) ethyl acrylate, poly (meth) acrylate, butyl poly (meth) acrylate, and methyl (meth) acrylate / (meth) acryl. Such as butyl acrylate copolymer, ethyl (meth) acrylate / butyl (meth) acrylate, ethylene / methyl (meth) acrylate, and styrene / methyl (meth) acrylate ) Acrylic resin composed of a homopolymer or a copolymer containing an acrylate ester (however, (meth) acryl means acryl or methacryl and the same hereinafter).

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

As the polyol, those having 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 at least two isocyanate groups is used. For example, aromatic isocyanates such as 2-4 tolylene diisocyanate, xylene diisocyanate, and 4-4 diphenylmethane diisocyanate, or aliphatic isocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, and hydrogenated diphenylmethane diisocyanate are used.

The decoration treatment is coloring (transparent or opaque coloring) by adding a pigment as shown in FIG.
1, embossing (heating press), hairline processing, etc. as shown in FIG. 1 (C). Alternatively, FIGS. 2A to 2
As shown in (C), a biodegradable or photodegradable sheet 1 is used as a base sheet, and a biodegradable or photodegradable transparent sheet 15 is laminated on the surface thereof. A configuration in which the above-described decoration treatment is applied to one or both layers may be employed.

As the pigment, 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 and brass, and pearlescent pigments made of foil powder such as titanium dioxide-coated mica and basic lead carbonate. These are added and dispersed as powder or flaky 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.

The patterns include a wood grain pattern, a stone grain pattern, a cloth grain pattern, a leather pattern, a geometric figure, a character, a symbol, and a solid image on the entire surface. The pattern is on the front, back, both sides of the sheet,
Alternatively, it is provided between layers.

As the ink (or) paint, as a binder, the above-mentioned biodegradable or photodegradable plastic, chlorinated polyolefin such as chlorinated polyethylene, chlorinated polypropylene, polyester, polyurethane, acrylic, vinyl acetate, chloride A vinyl / vinyl acetate copolymer, a cellulose resin, or the like is used, and one kind or a mixture of two or more kinds is used. A material obtained by adding known pigments as described above to this is used.

When printing directly on a biodegradable or photodegradable sheet, a biodegradable or photodegradable plastic of the same type as the sheet is preferable as a binder in terms of adhesiveness. If an appropriate layer is formed, sufficient adhesiveness can be obtained even if other binders are used.

The embossing is performed by heating and softening a biodegradable or photodegradable plastic, pressing and shaping with an embossing plate, and fixing by cooling. 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.

Next, the decorative sheet according to claim 2 is shown in FIG.
As shown in FIG. 1A, a top sheet made of a biodegradable or photodegradable transparent sheet 15 is laminated on a base sheet of the biodegradable or photodegradable sheet 1.

[Ultraviolet Absorber / Light Stabilizer] An ultraviolet absorber and / or a light stabilizer can be added in order to impart better weather resistance (light resistance) to the resin. Both the absorber and the light stabilizer are usually about 0.5 to 10% by weight, but it is generally preferable to use the ultraviolet absorber and the light stabilizer together.

Organic substances such as benzotriazole, benzophenone, salicylate, etc.
Alternatively, inorganic substances such as zinc oxide, cerium oxide, and titanium oxide having a diameter of 0.2 μm or less can be used. As the light stabilizer, a hindered amine radical scavenger such as bis- (2,2,6,6-tetramethyl-4-piperidinyl) sebacate and a radical scavenger such as a piperidine radical scavenger can be used.

The above ultraviolet absorber and light stabilizer are common to soft polypropylene, acrylic, ethylene / vinyl alcohol copolymer, thermoplastic polyester and polyolefin.

As the 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. The amount of addition is about 10 to 150 parts by weight based on 100 parts by weight of each resin.

If a biodegradable or photodegradable sheet is to be used as a cellular (sponge-like) foam, the biodegradable or photodegradable plastic should be
The sheet to which the foaming agent has been added is heated to foam the foaming agent. Examples of the blowing agent include azodicarbonamide, azobisisobutyronitrile, N-N'-dinitrosopentamethylenetetramine, oxybisbenzenesulfonylhydrazide, sodium hydrogen carbonate, potassium hydrogen carbonate, and the like, or acrylonitrile. A microcapsule type in which a heat-expandable gas such as hexane or isobutane is sealed in a resin spherical shell such as The amount of addition is usually 1 to 1 with respect to 100 parts by weight of biodegradable or photodegradable plastic.
0 parts by weight.

The method of further laminating a biodegradable or photodegradable transparent sheet on the surface of the decorative sheet according to claim 1 includes inflation, melt extrusion coating (extrusion coating), fusion by hot pressing, Or,
Dry lamination using an adhesive such as a two-component curable polyurethane resin or polyester resin.

The decorative sheet is a single layer of a decorative material (FIG. 1), a laminate of a biodegradable or photodegradable sheet and a biodegradable or photodegradable transparent sheet (FIG. 2). ) And three or more layers (not shown) are also possible.

Further, the decorative sheet of the present invention can be laminated on another adherend (backing material). In the case of lamination, the adhesive layer may be omitted if the decorative sheet itself can be adhered to the adherend (at a thermal melting point or the like) (FIG. 3B), and the decorative sheet itself adheres to the adherend. If not, laminate with an appropriate adhesive [FIG. 3 (A)].

The adherend is the 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, a plate material such as a flat plate or a curved surface plate of various materials (FIG. 3 (A)), a three-dimensional article [molded product, FIG.
(B)], articles of various shapes such as sheets (or films). As a material used for any of a board material, a three-dimensionally shaped article, and a sheet (film), a wood board such as a wood veneer, a wood plywood, a particle board, a medium density fiber board (MDF), a wood board such as a wood fiber board, etc. , Iron, aluminum and other metals, acrylic, polycarbonate, ethylene-vinyl acetate copolymer, ethylene vinyl acetate, polyester, polystyrene, polyolefin, A
Resins such as BS, phenolic resin, polyvinyl chloride, cellulosic resin, rubber, etc., and materials exclusively used as plate materials or three-dimensional shaped articles include ceramics such as glass, ceramics, etc., cements such as ALC (foamed lightweight concrete), Non-cement ceramic materials such as calcium silicate and gypsum,
Materials used exclusively as a sheet (or film) include paper such as high-quality paper and Japanese paper, and nonwoven fabric or woven fabric made of fibers such as carbon, asbestos, potassium titanate, glass, and synthetic resin.

As a method of 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 Japanese Patent No. 58014, etc., a decorative sheet is opposed to or placed on the surface of a molded article with an adhesive layer interposed therebetween.
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 JP-B-61-5895, JP-B-3-2666, etc., a decorative sheet is supplied in the longitudinal direction of a columnar substrate such as a column or a polygonal column via an adhesive layer therebetween. A so-called lapping method, in which a decorative sheet is sequentially pressure-adhered and laminated on a plurality of side surfaces constituting a columnar body by a plurality of rollers having different directions, a real public university 15-31.
No. 122, JP-A-48-47972, etc., a decorative sheet is first laminated on a plate-like substrate via an adhesive layer, and then the plate-like substrate is on the side opposite to the decorative sheet. Cut a V-shaped or U-shaped groove reaching the interface between the decorative sheet and the plate-shaped substrate on the surface, and then applying an adhesive in the groove, and bending the groove There is a so-called V-cut or U-cut processing method for forming a box or a column.

In particular, the method for bonding the decorative sheet of the present invention to a three-dimensional object having irregularities includes (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 and subjected to a predetermined forming process 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.

[0045]

Embodiments of the present invention will be described below in detail.

Example 1 An aliphatic polyester film 50 μm was used as a base sheet.
m (manufactured by Showa Denko KK “Bionore @ 302”
0 ”) was prepared. Then, after dissolving and diluting the aliphatic polyester-based composition for an easy-adhesion layer in a mixed solvent of methyl ethyl ketone and toluene, the composition is applied to the surface of the base sheet, and the mixed solvent is volatilized by drying at 60 ° C. for 1 minute. After removal, an easily adhesive layer having a thickness of 3 μm was obtained.

Next, a composition obtained by adding a pigment to the aliphatic polyester-based decorative layer composition is dissolved and diluted in the same mixed solvent as described above, and the grain is gravure-printed on the easy-adhesion layer.
After drying, a decorative layer (picture layer) was obtained. Next, a 50 μm transparent aliphatic polyester film (trade name “Bionore @ 3020” manufactured by Showa Denko KK) was laminated on the decorative layer via an adhesive layer as a surface sheet to obtain a decorative sheet of the present invention. Was. When this decorative sheet was discarded in soil, it was almost decomposed three months later.

Example 2 Thickness of 80 parts by weight based on 100 parts by weight of polyvinyl alcohol and 2 parts by weight of a benzotriazole-based ultraviolet absorber added
μm unstretched sheet (flexural modulus 3000 kg / cm
² ) was used as the topsheet. One surface of this topsheet is subjected to corona treatment, polyvinyl alcohol is used as a binder, gravure printing is performed on the zelkova pattern with an ink containing a pigment, and a 3 μm-thick film is easily adhered with a polyvinyl alcohol-based primer. The primer layer was provided by a gravure coating method. Next, a polyvinyl alcohol film having a thickness of 80 μm was used as the base sheet.

The two sheets are superimposed on each other so that the primer surface of the decorative surface sheet obtained above is on the base sheet side, and the two sheets are laminated and bonded using a rotary hot press embossing machine. did. At this time, of the laminating (nip) rolls, the roll coming to the surface sheet side is a metal roll, and the embossing roll is formed by forming irregularities of zelkova wood channel grooves on the surface. The decorative sheet of the present invention was manufactured by embossing a concave and convex pattern. The embossing conditions were as follows: sheet heating temperature during embossing: 165 ° C. Sheet feed speed: 15 m / min Emboss plate surface temperature: 40 ° C. After disposing of this decorative sheet in the soil,
After three months, it had almost completely decomposed.

Example 3 A sheet of pullulan (redox modulus: 3000 k) colored reddish brown by adding red iron oxide, titanium white and graphite as pigments
g / cm ² ) is used as the base sheet. The surface of the substrate sheet was subjected to a corona discharge treatment, and then, using a colored ink obtained by adding a pigment to pullulan as a binder, gravure printing was performed on the entire surface and a cedar straight grain pattern. On top of this, a two-component curable polyurethane adhesive containing hexamethylene diisocyanate as a curing agent and acrylic polyol as a main component is applied at 10 g / m ² (when dry), and the diluting solvent is dried. A 50 μm-thick transparent sheet made of pullulan to which 2% by weight of a triazole-based UV absorber has been added is laminated, pressed, and heated to 40 ° C.
After curing for 4 days in an atmosphere, the printing ink and the adhesive were cross-linked and cured to obtain a decorative sheet. When this decorative sheet was discarded in soil, it was almost decomposed three months later.

Example 4 A film obtained by adding 2 parts by weight of a benzotriazole type ultraviolet absorber to 100 parts by weight of cellulose acetate and having a thickness of 80
μm unstretched sheet (flexural modulus 3000 kg / cm
² ) was used as a substrate sheet. One side of the base sheet was subjected to a corona treatment, and a zelkova pattern was gravure-printed with an ink containing cellulose acetate as a binder and a pigment added thereto, thereby producing a decorative sheet of the present invention. When this decorative sheet was discarded in soil, it was almost decomposed three months later.

Comparative Example 1 The base sheet and the top sheet of Example 1 were 80 μm thick.
m, and a biaxially stretched polypropylene sheet (bending elastic modulus: 9000 kg / cm ² ) having a stretching ratio of 3 times was used. Others were the same as Example 1. When this decorative sheet was discarded into the soil, it did not decompose even after 3 months.

Comparative Example 2 The base sheet and the surface sheet of Example 2 were 80 μm thick.
m, and a biaxially stretched polypropylene sheet (bending elastic modulus: 9000 kg / cm ² ) having a stretching ratio of 3 times was used. Others were the same as Example 2. When this decorative sheet was discarded into the soil, it did not decompose even after 3 months.

Comparative Example 3 The base sheet and surface sheet of Example 3 were 80 μm thick.
m, and a biaxially stretched polypropylene sheet (bending elastic modulus: 9000 kg / cm ² ) having a stretching ratio of 3 times was used. Others were the same as Example 3. When this decorative sheet was discarded into the soil, it did not decompose even after 3 months.

Comparative Example 4 As the base sheet of Example 4, a biaxially stretched polypropylene sheet having a thickness of 80 μm and a draw ratio of 3 (with a flexural modulus of 9) was used.
000 kg / cm ² ). Others were the same as Example 4. After disposing of this decorative sheet in the soil,
There was no sign of decomposition after more than three months.

[Performance Evaluation Test] Table 1 shows the results of comparing the decorative sheets of Examples 1 to 4 with the decorative sheets of Comparative Examples 1 to 4 in terms of V-cut suitability.

[Test Method] 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.

[0058]

[Table 1]

[0059]

The decorative sheet of the present invention has V-cut impact resistance, flexibility and suitability for bending, and has the effect of improving design by printing. Excellent embossing suitability compared to general olefin-based films. Decorative sheets that become unnecessary after use are decomposed even if they are landfilled as waste without being incinerated, so they are friendly to the natural environment. As in the case of conventional polyvinyl chloride, there is an effect that no harmful chlorine-based gas is generated even when incinerated. As a cosmetic material, it is a cosmetic material which does not crack or break even after V-cutting or other bending, and has excellent effects in all aspects of durability, appearance, and environment (ecology).

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of a decorative sheet according to the present invention, which has a single-layer structure.

FIG. 2 is a cross-sectional view showing an example of the decorative sheet according to claim 1 or 2 which has a two-layer laminated structure among the decorative sheets according to the present invention.

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

FIG. 4 is a sectional view showing an example of a decorative material according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 biodegradable or photodegradable 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 coloring ink wiping filling 12 decorative sheet 15 transparent sheet 21 decorative Sheet 22 Decorative sheet 23 Decorative sheet 30 Adhesive layer 31 Adherend (flat plate) 32 Decorative sheet 33 Adherend (irregular three-dimensional object) 40 V cut processing

Claims (3)

[Claims] 1. A decorative sheet characterized by subjecting a biodegradable or photodegradable sheet to decorative treatment. 2. A decorative sheet obtained by laminating a biodegradable or photodegradable transparent sheet on the surface of the decorative sheet according to claim 1. 3. The sheet having biodegradability or photodegradability has a dimensional shrinkage rate after heating in an atmosphere of 100 ° C. for 30 minutes (based on before heating) of a long strip-shaped sheet. 3. The decorative sheet according to claim 1, wherein the length of the sheet is in a range of −2 to + 7%, and the width of the sheet is in a range of −7 to + 2%.