JP2000289162A - Decorative sheet - Google Patents

Abstract

(57) [Problem] To provide a decorative sheet which is excellent in scratch resistance and does not cause breakage or whitening during V-cut processing. The initial flexural modulus is 10,000 kgf / cm.
² or more, 22000 kgf / cm ² or less, a tensile elongation at break of 200% or more, and a molecular weight distribution MWD of at least 5 a transparent resin layer 1 of a resin composition mainly composed of a highly crystallized polypropylene resin having a resin of 5 or less. ing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet used for interior materials of buildings, surfaces of fittings, surfaces of home electric appliances, and the like. The present invention relates to a decorative sheet bonded to a wooden board, an inorganic board, a metal plate, or the like. The present invention relates to a decorative sheet used as a board.

[0002]

2. Description of the Related Art In recent years, many decorative sheets using an olefin resin have been proposed as decorative sheets replacing vinyl chloride decorative sheets. For example, Japanese Patent Laid-Open No. 2-1
28843, JP-A-4-83664, JP-A-6-1881, JP-A-6-198831, JP-A-9-328562 and the like. But,
In the decorative sheet using the olefin resin disclosed therein, by not using a vinyl chloride resin in the production method, the generation of toxic gas or the like at the time of incineration is eliminated, or a general polypropylene sheet or a soft polypropylene sheet The surface scratch resistance was poor due to the use of, and the surface scratch resistance of the conventional vinyl chloride decorative sheet was far inferior.

[0003]

DISCLOSURE OF THE INVENTION The present inventors have studied a high crystalline polypropylene having an initial flexural modulus of 10,000 kgf / cm ² or more, and found an excellent advantage in terms of scratch resistance. When V-cutting, drilling, or other cutting processing is performed in the post-processing as a decorative board, the film may break or the outer peripheral portion may crack, and the purpose is to improve the film-forming properties of high-crystalline polypropylene. When polyethylene was added in an amount of 5% or more, whitening sometimes occurred when V-cut was performed because the compatibility between polyethylene and polypropylene was poor.

On the other hand, the present inventors have further proposed a resin composition comprising 95 to 100% by weight of highly crystalline polypropylene and 0 to 5% by weight of polyethylene and having an initial flexural modulus of 10,000 kgf / cm. ² or more, 250
00 kgf / cm ² or less and a tensile elongation at break of 200
% Transparent resin layer at least and a total thickness of 8%
A decorative sheet having a thickness of 0 μm or more and 250 μm or less has been developed, thereby significantly improving suitability for V-cut processing and achieving compatibility with surface scratch resistance. However, in a low temperature environment,
Under conditions such as high-speed bending, whitening or breakage of the transparent resin layer made of the highly crystalline polypropylene may occur, causing a problem.

Accordingly, an object of the present invention is to provide a decorative sheet which is excellent in scratch resistance and does not cause breakage or whitening during V-cut processing.

[0006]

According to the first aspect of the present invention, an initial flexural modulus is not less than 10,000 kgf / cm ^{2 and not} more than 22,000 kgf / cm ² , and a tensile elongation at break is not more than ² kgf / cm 2.
A decorative sheet comprising at least a transparent resin layer of a resin composition mainly composed of a highly crystallized polypropylene resin having a molecular weight distribution MWD of 5 or less and having a molecular weight distribution of 5 or less. Claim 2 of the present invention
The invention according to claim 1 is the decorative sheet according to claim 1, wherein the composition ratio of the highly crystallized polypropylene resin in the resin composition is 90 to 100% by weight. The invention according to claim 3 of the present invention is the decorative sheet according to claim 1 or 2, wherein a total thickness of the decorative sheet is 80 μm or more and 250 μm or less.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The decorative sheet of the present invention is a decorative sheet having at least a transparent resin layer, and the resin composition constituting the transparent resin layer has an initial flexural modulus of 10%.
2,000 kgf / cm ² or more, 22000 kgf / cm ²
Or less, more preferably 13000 kgf / cm ² or more,
It is 22000 kgf / cm ² or less. The resin composition is a highly crystallized polypropylene having a tensile elongation at break of 200% or more, more preferably 300% or more and 1000% or less, and a molecular weight distribution (MWD) of 5 or less, more preferably 4 or less. Resin is mainly 90-100
% By weight, and the total thickness of the decorative sheet is 8
0 μm or more, 250 μm or less, more preferably 100 μm
It is important that the thickness is not less than m and not more than 160 μm.

The high crystalline polypropylene may be a homopolymer of propylene, that is, a homopolymer, or a binary or ternary random copolymer copolymerized with ethylene, butene, or the like. In the present invention, the highly crystalline polypropylene refers to a polypropylene having a boiling heptane-soluble residue of 95% or more.

Resins other than the highly crystallized polypropylene constituting the transparent resin layer can be appropriately selected depending on the purpose of blending, as long as the properties of the highly crystallized polypropylene are not significantly adversely affected.

Hereinafter, a decorative sheet using a highly crystalline polypropylene according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of a single-layer decorative sheet provided with a sheet-shaped transparent resin layer 1 using a transparent high-crystalline polypropylene resin according to the present invention. A pattern layer 2 and a concealing layer 3 are provided on one surface of a transparent resin layer 1 activated by plasma treatment, electron beam treatment, ultraviolet treatment, dichromic acid treatment, etc.
Is a decorative sheet having a configuration in which a top coat layer 4 is provided on the surface opposite to the above. If the concealing layer 3 has a problem in adhesiveness to a plate-like base material for forming a decorative sheet to which a decorative sheet is attached, a primer layer 5 may be provided as appropriate on the concealing layer 3. Further, an embossed pattern may be appropriately provided on the top coat layer 4 side in order to improve the design.

The embossed pattern provided on the side of the top coat layer 4 in the structure of FIG. 1 is directly applied to the transparent resin layer 1 made of a highly crystalline polypropylene resin. 1, a method of giving an embossed pattern using an embossed plate having an uneven pattern by heat and pressure, and a method of providing embossing simultaneously with cooling using a cooling roll having an uneven pattern when forming a film using an extruder and so on. Here, it is also possible to embed ink in the embossed concave portions of the embossed pattern to further improve the design.

The method of forming the sheet-shaped transparent resin layer 1 made of a transparent high-crystalline polypropylene resin is not particularly limited as long as it can be formed into a film, and is not specified in the present invention. The method is general.

In FIG. 1, the method of providing the picture layer 2 and the concealing layer 3 is as follows: gravure printing, offset printing, screen printing, flexographic printing, electrostatic printing, ink jet, etc. are directly applied to the transparent resin layer 1 made of a highly crystalline polypropylene resin. There is a method of performing printing or the like. In particular, when applying the concealing layer 3, a comma coater, a knife coater, a lip coater, a metal deposition or a sputtering method may be used.

The method of providing the top coat layer 4 is the same as the method of providing the concealing layer 3 and the picture layer 2, and is not specified in the present invention.

The transparent resin layer 1 made of a highly crystalline polypropylene resin used here has a heat stabilizer, if necessary,
Flame retardants, ultraviolet absorbers, light stabilizers, anti-blocking agents, catalyst scavengers, coloring agents as long as transparency is maintained, light scattering agents for translucency, gloss modifiers, etc. can also be added. . Hindered phenol, sulfur, hydrazine, etc. as heat stabilizers, aluminum hydroxide, magnesium hydroxide, etc. as flame retardants, benzotriazole, benzoate, benzophenone, triazine, etc. as UV absorbers Generally, hindered amines are used as stabilizers, and these are generally added in any combination. In particular, when used in this application, it is necessary to consider the weather resistance, and the ultraviolet absorber and the light stabilizer are indispensable, and the added amount is 0.1 to 1.0 wt. % Is an appropriate amount.

When an ink is used for the picture layer 2, the ink binder may be selected from single or modified products of nitrified cotton, cellulose, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, polyurethane, acrylic, polyester and the like. What is necessary is just to select suitably. These may be aqueous, solvent-based, or emulsion-type, and may be arbitrarily selected from a one-part curing type and a two-part curing type using a curing agent. Further, the ink can be cured by irradiation with ultraviolet rays, electron beams, or the like. Among them, the most common method is a method of curing with urethane-based ink using isocyanate. In addition to these binders, coloring agents such as pigments and dyes, extenders, solvents, and various additives contained in ordinary inks are added. Particularly frequently used pigments include pearl pigments such as condensed azo, insoluble azo, quinacridone, isoindoline, anthraquinone, imidazolone, cobalt, phthalocyanine, carbon, titanium oxide, iron oxide, and mica. In addition to the application of the ink, it is also possible to apply the design by vapor deposition or sputtering of various metals.

The material used for the concealing layer 3 may be basically the same as that of the picture layer 2. However, opaque pigments, titanium oxide, oxide Use iron or the like. Further, the concealing layer 3 may be added with a metal such as gold, silver, copper, or aluminum in order to enhance concealing properties. Generally, flake-like aluminum is often added. The coating thickness of the concealing layer 3 is 2 μm.
m or less, it is difficult to impart the concealing property.
Is appropriate.

The material used for the top coat layer 4 is not particularly limited in the present invention, but may be polyurethane, acrylic, acrylic silicon, fluoro, epoxy, vinyl, polyester, or melamine. System, aminoalkyd system, urea system and the like. The form of the top coat layer 4 can be any of aqueous, emulsion and solvent types, and the curing can be a one-part curing type or a two-part type using a curing agent. Above all, a urethane top coat utilizing an isocyanate reaction is desirable from the viewpoint of workability, cost, cohesive strength of the resin itself, and the like. Isocyanates include tolylene diisocyanate (TDI), xylylene diisocyanate (XDI),
Hexamethylene diisocyanate (HMDI), metadiisocyanate (MDI), lysine diisocyanate (LDI), isophorodiisocyanate (IPDI),
It can be appropriately selected from methylhexane diisocyanate (HTDI), methylcyclohexanone diisocyanate (HXDI), trimethylhexamethylene diisocyanate (TMDI) and the like, but in consideration of weather resistance, a type having a linear structure rather than a type having a double bond, Particularly, hexamethylene diisocyanate (HMDI) is most suitable. In order to further improve the hardness of the surface, it is possible to use a resin that is cured by irradiation with ultraviolet rays or electron beams. In order to further improve the weather resistance, an ultraviolet absorber and a light stabilizer may be appropriately added. Further, in order to impart various functions, functional additives such as antibacterial materials and antifungal materials can be arbitrarily added. Further, in order to adjust the gloss from the surface design, or to further impart abrasion resistance, addition of alumina, silica, silicon nitride, silicon carbide, glass beads or the like can be optionally performed. The appropriate coating thickness is usually 2 μm to 10 μm.

The material used for the primer layer 5 may be basically the same as the picture layer 2 and the concealing layer 3. However, since the primer layer 5 is applied to the back surface of the decorative sheet, it is wound in a web form. Avoid blocking when considering what to do,
In addition, an inorganic filler such as silica, alumina, magnesia, titanium oxide, and barium sulfate may be added to enhance the adhesion with the adhesive. The thickness of the coating is preferably 0.1 μm to 3.0 μm, since the purpose is to ensure close contact with the plate-like base material for a decorative board for bonding a decorative sheet.

FIG. 2 shows an example of a laminated type configuration of a sheet-shaped transparent resin layer 1 made of a highly crystalline polypropylene resin and various support sheets provided with a pattern. Here, the lamination method and the number of various transparent layers including the transparent resin layer 1 can be arbitrarily selected. What is important is that at least the outermost synthetic resin sheet of the decorative sheet having a multilayer structure in which a plurality of synthetic resin sheets are laminated is formed of a sheet-shaped transparent resin layer 1 made of a highly crystalline polypropylene resin.

The details will be described below with reference to the drawings. FIG. 2 shows a top coat layer 4, a transparent resin layer 1, and an adhesive layer 6 in this order from the top.
(Thermal adhesive layer, anchor coat layer, dry laminate adhesive layer), picture layer 2, support sheet 7, primer layer 5
2 is an example of the configuration of a decorative sheet in which the decorative sheet is laminated. Here, the top coat layer 4 and the embossing provided on the top coat layer 4 (and the transparent resin layer 1) may be provided if necessary, and the primer layer 5 is also made of an olefin base material for bonding a decorative sheet. This is necessary when the surface is inactive like a system material, but is not particularly necessary when the surface is an active substrate. When a base material having an inert surface such as an olefin base material is used, a corona treatment, a plasma treatment, an ozone treatment, an electron beam treatment, an ultraviolet treatment, a dichromic acid treatment, etc. It is desirable to carry out. Further, a primer layer 5 may be provided to ensure close contact with the picture. When it is desired to provide the decorative sheet with concealing properties, a concealing colored sheet may be used as the support sheet 7, and
A layer having the same concealing function as the concealing layer 3 as shown in FIG. 1 may be provided.

In FIG. 2, the support sheet 7 may be paper such as tissue paper, titanium paper, resin-impregnated paper, polyethylene, polypropylene, polybutylene, polystyrene, polycarbonate, polyester, polyamide, ethylene-vinyl acetate copolymer, polyvinyl alcohol, acrylic, etc. Synthetic resins, or foams of these synthetic resins, ethylene-propylene copolymer rubber, ethylene-propylene diene copolymer rubber, styrene butadiene copolymer rubber, styrene-isoprene-styrene block copolymer rubber, styrene butadiene-styrene It can be arbitrarily selected from block copolymer rubber, rubber such as polyurethane, organic or inorganic nonwoven fabric, synthetic paper, metal foil such as aluminum, iron, gold, silver and the like. Further, the support sheet 7 may be a sheet made of the same resin composition as the transparent resin layer 1.

In the configuration of FIG. 2, the transparent resin layer 1, the picture layer 2, the top coat layer 4, and the primer layer 5 may be the same as those in FIG.

The adhesive layer 6 used for bonding the transparent resin layer 1 and the support sheet 7 can be made of any material in the bonding method, and includes a lamination method such as heat lamination, extrusion lamination, and dry lamination. The adhesive can be selected from acrylic, polyester, polyurethane, and other materials. Usually, from the cohesive strength, a two-part curing type urethane system which is a reaction with a polyol using isocyanate is desirable.

Although there is no particular limitation on the laminating method in the present invention, a method applying heat and pressure, an extrusion laminating method, a dry laminating method and the like are generally used. In addition, when an embossed pattern is applied, there are a method of embossing the sheet once laminated by various methods by hot pressure, and a method of embossing with a cooling roll provided with a concavo-convex embossed pattern simultaneously with the extrusion lamination. Further, there is a method of bonding the transparent resin layer 1 and the base material sheet 7 that have been embossed simultaneously with the extrusion by heat or dry lamination. Further, the position where the pattern layer 2 and the adhesive layer 6 are applied may be on the support sheet 7 side as usual, or on the transparent resin layer 1 side.

Further, it is also possible to embed ink into the emboss to improve the design.

FIG. 3 shows an example of a laminated type configuration different from FIG. The primer layer 5, the support sheet 7, the picture layer 2, the transparent resin layer 1, the top coat layer 4, the adhesive layer 6, etc.
This is exactly the same as FIG. 2 except that an adhesive resin layer 8 is provided between the adhesive layer 6 and the transparent resin layer 1. This is particularly performed when further laminating strength is required by an extrusion laminating method, but lamination is performed by a co-extrusion method of the transparent resin layer 1 and the adhesive resin layer 8.

The adhesive resin layer 8 is made of polypropylene,
A resin made of polyethylene, acrylic resin, etc., which has been subjected to acid modification. The thickness is 2 μm or more for the purpose of improving the adhesive strength. If the thickness is too large, the surface hardness is improved with the highly crystalline transparent resin layer 1. However, the thickness is desirably 20 μm or less because it is affected by the softness of the adhesive resin layer 8 itself.

From the viewpoint of weather resistance, the picture layer 2 and the support sheet 7
In order to protect the decorative layer (and the decorative sheet substrate to which the decorative sheet is to be attached), not only the top coat layer 4 and the transparent resin layer 1 are weather-resistant as described above, but also the adhesive layer 6 has an ultraviolet absorber and light. There is also a method of adding a stabilizer.

The thickness of the laminated type shown in the examples of FIGS. 2 and 3 is 30 μm to 150 μm in consideration of the printing workability and cost for the support sheet 7, and the design and post-processability for the transparent resin layer 1 are as follows. 30 μm to 150 μm in consideration of cost
It is desirable that the total thickness of the laminate is 80
It is necessary to be in the range of μm to 250 μm.

[0032]

The decorative sheet of the present invention as described above does not use vinyl chloride resin as a resin to be used, so that it is not only environmentally friendly without generation of toxic gas at the time of incineration, etc. It becomes an excellent decorative sheet having the same scratch resistance and good V-cut processing suitability.

[0033]

EXAMPLES Specific examples of the decorative sheet of the present invention will be described below. <Example 1> Initial flexural modulus of elasticity 18000 kgf / cm ²
Hereinafter, the tensile elongation at break is 600%, and the molecular weight distribution (MWD)
3, a hindered phenolic antioxidant (Irganox 1010; manufactured by Ciba Specialty Chemicals) is added to a highly crystalline polypropylene resin (98% boiling residue soluble in 98%), and a benzotriazole ultraviolet absorber (Tinuvin 328; A resin containing 2000 ppm of Ciba Specialty Chemicals and 2000 ppm of a hindered amine-based light stabilizer (Chimassorb 944; manufactured by Ciba Specialty Chemicals) was melt-extruded using an extruder to obtain a highly crystalline transparent film having a thickness of 80 μm. A resin sheet was formed, and a corona treatment was applied to both sides of the sheet to make the surface wet at 40 dyn / cm or more, thereby forming a sheet-shaped transparent resin layer 1. On the other hand, a two-part curable urethane ink (V180; Toyo Ink Manufacturing Co., Ltd.) is provided on one side of a 70 μm-thick colored support sheet 7 having a hiding property.
The pattern layer 2 was formed by performing pattern printing, and the primer layer 5 was formed by applying a primer coat to the other surface (back surface) of the support sheet 7. Thereafter, on the surface of the pattern layer 2 of the support sheet 7, the highly crystalline sheet-shaped transparent resin layer 1 is applied as an adhesive layer 6 by an adhesive for dry lamination (Takelac A540; manufactured by Takeda Pharmaceutical Co., Ltd .; 2 g / m ² ), and the sheet was embossed on the surface of the transparent resin layer 1 of the sheet, and then the two-component curable urethane top coat (W1
84; manufactured by Dainippon Ink Co., Ltd.) at a coating amount of 3 g / m ² to form a top coat layer 4 having a total thickness of 1 shown in FIG.
A decorative sheet of the present invention having a thickness of 54 μm was obtained.

Example 2 Initial flexural modulus of elasticity 18000k
gf / cm ² or less, a tensile elongation at break of 600%, and a molecular weight distribution (MWD) of 3 to a highly crystalline polypropylene resin (having a boiling heptane-soluble residue of 98%) and a hindered phenolic antioxidant (Irganox 1010; Resin containing 500 ppm of Ciba Specialty Chemicals, 2000 ppm of a benzotriazole-based UV absorber (Tinuvin 328; manufactured by Ciba Specialty Chemicals), and 2000 ppm of a hindered amine light stabilizer (Chimasorb 944; Ciba Specialty Chemicals). When,
A sheet-like transparent resin layer 1 in which an adhesive resin made of a polyethylene-based easy-adhesion resin is extruded into a sheet with a thickness of 80 μm by co-extrusion using a melt extruder, and an adhesive resin layer 8 is laminated on one surface. Was formed. On the other hand, one side of a 70 μm thick colored support sheet
A resin in which pattern printing is performed with a liquid-curable urethane ink (V180; manufactured by Toyo Ink Mfg. Co., Ltd.) to form a pattern layer 2, and a primer coat is applied to the other surface (back surface) of the support sheet 7. The sheets were bonded by extrusion lamination to form a primer layer 5. Thereafter, the surface of the pattern layer 2 of the support sheet 7 and the surface of the adhesive resin layer 8 of the highly crystalline sheet-like transparent resin layer 1 are used as an adhesive layer 6 as an adhesive for dry lamination (Takelac A).
540; manufactured by Takeda Pharmaceutical Co., Ltd .; coated amount 2 g / m ² ) by dry lamination, embossing the surface of the transparent resin layer 1 of this sheet,
A liquid-curable urethane top coat (W184; manufactured by Dainippon Ink Co., Ltd.) is applied at a coating amount of 3 g / m ² to form a top coat layer 4, and a decorative sheet of the present invention having a total thickness of 155 μm shown in FIG. I got

Example 3 Initial flexural modulus of elasticity 18000k
gf / cm ² or less, a tensile elongation at break of 600% and a molecular weight distribution (MWD) of 3 to a highly crystalline polypropylene resin (98% of a boiling heptane soluble residue) and a hindered phenolic antioxidant (Irganox 1010; Ciba). A resin containing 500 ppm of specialty chemicals, 2000 ppm of a benzotriazole-based ultraviolet absorber (Tinuvin 328; manufactured by Ciba Specialty Chemicals), and 2000 ppm of a hindered amine-based light stabilizer (Chimasorb 944; manufactured by Ciba Specialty Chemicals) was extruded. Extrusion using a machine, thickness 100μm
The highly crystalline sheet-shaped transparent resin layer 1 was formed. Next, a corona treatment is applied to both surfaces of the transparent resin layer 1 to keep the surface wet at 40 dyn / cm or more. Then, a two-part curable urethane ink (V18) is applied to one surface of the transparent resin layer 1.
0: pattern printing by Toyo Ink Mfg. Co., Ltd., and a pattern layer 2 is applied. The pattern layer 2 is superimposed on the pattern layer 2 and concealed with a two-component curable urethane ink (V180; Toyo Ink Mfg. Co., Ltd.). Layer 3 was applied at a coating amount of 6 g / m ² , and then overlaid on the concealing layer 3 to form a two-part curable urethane ink (PET).
-E reducer; Dainichi Seika Co., Ltd.)
/ M ² to form a primer layer 5. After embossing the surface of the transparent resin layer 1 of the sheet, a two-component curable urethane top coat (W184; manufactured by Dainippon Ink Co., Ltd.) was applied to the surface at an application amount of 3 g / m ² to top the surface. The coat layer 4 was formed, and a decorative sheet of the present invention having a total thickness of 110 μm shown in FIG. 1 was obtained.

Comparative Example 1 In Example 2, a highly crystalline polypropylene resin having an initial flexural modulus of 18,000 kgf / cm ² or less, a tensile elongation at break of 600%, and a molecular weight distribution (MWD) of 3 (boiling heptane soluble residue) was used. 98%), a random polypropylene resin having an initial flexural modulus of 8000 kgf / cm ² and a tensile elongation at break of 800% (boiling heptane-soluble residue 83%) was used. Thus, a decorative sheet of Comparative Example 1 was obtained.

Comparative Example 2 In Example 2, a highly crystalline polypropylene resin having an initial flexural modulus of elasticity of 18000 kgf / cm ² or less, a tensile elongation at break of 600%, and a molecular weight distribution (MWD) of 3 (boiling heptane soluble residue) was used. Instead of 98%), a highly crystalline polypropylene resin having an initial flexural modulus of 18000 kgf / cm ² or less, a tensile elongation at break of 600%, and a molecular weight distribution (MWD) of 7 (boiling heptane soluble residue 96%) is used. Otherwise, a decorative sheet of Comparative Example 2 was obtained in the same manner as in Example 2.

Comparative Example 3 In Example 2, a highly crystalline polypropylene resin having an initial flexural modulus of 18000 kgf / cm ² or less, a tensile elongation at break of 600%, and a molecular weight distribution (MWD) of 3 (boiling heptane soluble residue) was used. Instead of 98%), a highly crystalline polypropylene resin having an initial flexural modulus of elasticity of 18000 kgf / cm ² and a tensile elongation at break of 25% (boiling heptane-soluble residue: 96%) was used. In the manner described above, a decorative sheet of Comparative Example 3 was obtained.

Comparative Example 4 The procedure of Example 2 was repeated except that the thickness of the resin obtained by coextrusion of the highly crystalline polypropylene resin and the adhesive resin was 200 μm, and the total thickness of the decorative sheet was 275 μm. In the same manner as in Example 2, a decorative sheet of Comparative Example 4 was obtained.

<Comparative Test> Examples 1 to 3 and Comparative Example 1
Each of the decorative sheets obtained in Nos. 1 to 4 was bonded to a wooden substrate using a urethane-based adhesive to prepare decorative plates for comparative tests. Then, for each decorative board, the surface hardness (surface scratching property) of the decorative sheet surface is evaluated by a pencil hardness test, and a V-shaped cut processing test (V cut test) from the wood base material side is performed. Then, the presence or absence of suitability for V-cut processing was evaluated. The evaluation results are shown in Table 1.
Note that the pencil hardness test and the V-cut test are performed in a low-temperature 5 ° C. atmosphere so as not to be affected by the processing machine and the environment at the time of processing.
In addition, each of the decorative plates after the V-cut was bent under a high-speed bending condition in which the required time for bending at a right angle on the V-cut surface was 0.2 seconds.

<Comparative Results> As is clear from Table 1, the decorative sheet using the highly crystalline polypropylene according to the present invention as the transparent resin layer 1 is superior in the surface scratching property to the conventional decorative sheet. And the suitability for V-cut processing was good.

[0042]

[Table 1]

[0043]

Since the decorative sheet of the present invention does not use any vinyl chloride resin, the decorative sheet is not only environmentally friendly but also has excellent surface scratch resistance and excellent V-cut workability. Can be provided.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transparent resin layer 2 ... Picture layer 3 ... Hiding layer 4 ... Top coat layer 5 ... Primer layer 6 ... Adhesive layer 7 ... Support sheet 8 ...
Adhesive resin layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Aizawa 1-5-1, Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd. (72) Inventor Katsuyuki Niname 1-1-1, Taito, Taito-ku, Tokyo F-term in Toppan Printing Co., Ltd. (reference) 4F071 AA20 AE05 AE09 AF15 AF17 AH03 BA01 BB06 BC01 BC09 4F100 AA01 AB01 AK01A AK04G AK07B AP00 AT00A BA02 BA25 CB00 DD01 EJ551 GB08 GB48 GB81 HB00 JB11J07B01 J11B07 BB141 BB151 FD030 FD040 FD050 FD090 GF00 GL00 GL01

Claims (3)

[Claims] 1. An initial flexural modulus of elasticity of 10,000 kgf / cm.
² or more, 22000 kgf / cm ² or less, a tensile elongation at break of 200% or more, and a molecular weight distribution MWD of at least a transparent resin layer of a resin composition mainly composed of a highly crystallized polypropylene resin of 5 or less. A decorative sheet, characterized in that: 2. The composition of the highly crystallized polypropylene resin in the resin composition is 90 to 100% by weight.
The decorative sheet according to the above. 3. The total thickness of the decorative sheet is 80 μm or more.
The decorative sheet according to claim 1, wherein the decorative sheet has a thickness of 50 μm or less.