JP2003089172A - Decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet formed of a laminate including at least a base material (backing layer), a foam layer, and a printing ink layer, and to have properties such as foamability, curl resistance, and scratch resistance. The present invention provides a decorative sheet that is excellent in safety and does not generate harmful gases such as chlorine even when burned, and is excellent in safety and environmental suitability. SOLUTION: In a decorative sheet obtained by heating and foaming a laminate obtained by laminating at least a foamable resin layer 2 and a printing ink layer 3 on a base material (backing layer) 1, a foamable resin layer 2 is provided.
The main component is a copolymer resin of ethylene and various acrylic acid esters or methacrylic acid esters, or a mixed resin thereof, or an ethylene copolymer resin obtained by blending an ethylene / vinyl acetate copolymer resin with them,
It is formed from a resin composition obtained by adding at least a foaming agent thereto, the MFR of the ethylene-based copolymer resin is 4.5 or less, and the comonomer content is 17 to 2
Make up 4% by weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet, and more specifically, it is used for interior materials of buildings such as wallpaper, floor materials and ceiling materials, and other surface coating materials for furniture, home appliances, leather, book covers, etc. It can be used for a wide range of applications such as surface materials, and a foamed resin layer is laminated on its intermediate layer etc., and it has good tactile sensation and various performances, and when it is disposed of after use,
The present invention relates to a decorative sheet that does not generate harmful gas even when incinerated and is excellent in safety.

[0002]

2. Description of the Related Art Conventionally, a decorative sheet which is used as an interior material for buildings such as wallpaper, floor material, and ceiling material, and other surface coating material for furniture, home appliances, etc., in which a foamed resin layer is laminated as an intermediate layer. For example, a backing layer such as paper or cloth is laminated on a resin sheet formed by blending a blowing agent with a plasticizer, a stabilizer, etc. in a polyvinyl chloride resin, and a printing layer such as a pattern is provided on the surface and heated. Foamed decorative sheets are known.

[0003]

However, in the conventional decorative sheet as described above, the expandable resin layer which is the main component of the conventional decorative sheet has a polyvinyl chloride resin as a main component, and it is essential to add a plasticizer. Therefore, there is a problem that the plasticizer migrates to the surface in a long-term use and causes stickiness on the surface, which makes it easy for dirt to adhere and hardens at the part where the plasticizer has come off, and easily cracks at low temperature. It was

Further, such a decorative sheet made of polyvinyl chloride resin has a problem of causing gas poisoning at the time of fire because it produces a harmful gas such as chlorine gas and hydrochloric acid gas when burning. Also, after long-term use,
There was also a problem of causing air pollution and environmental pollution during incineration.

The present invention has been made to solve the above problems, and its object is to provide interior materials for buildings such as wallpaper, floor materials, and ceiling materials, and other furniture and home appliances. It is a decorative sheet that can be used in a wide range of applications such as surface coating materials, and has a foamable resin layer laminated on its intermediate layer, and its foamability, processability, curl resistance, scratch resistance, flame resistance, etc. Good performance, no stickiness on the surface due to migration of plasticizer even after long-term use, and no generation of harmful gases such as chlorine even when burned by fire or incineration after use. It is to provide a decorative sheet having excellent performance, safety, and environmental suitability with high productivity.

[0006]

The above-mentioned problems can be solved by the present invention described below. That is, the invention according to claim 1 is a decorative sheet obtained by heat-foaming a laminate in which at least a foamable resin layer and a printing ink layer are laminated on a substrate (backing layer), the foamable resin layer Is ethylene and the general formula (1) CH ₂ ═CR ₁ COOR ₂ (1) [wherein, R ₁ is H or CH ₃ and R ₂ is an alkyl group. ] An ethylene-acrylic copolymer resin obtained by copolymerizing an acrylic ester or a methacrylic ester represented by or a mixed resin thereof, or an ethylene copolymer resin obtained by blending an ethylene-vinyl acetate copolymer resin therewith. It is formed of a resin composition comprising a main component and at least a foaming agent added thereto, and the ethylene / acrylic copolymer resin or a mixed resin thereof, or an ethylene-vinyl acetate copolymer resin blended therewith. MFR of ethylene copolymer resin is 4.5
The decorative sheet is characterized in that the content of the comonomer with respect to ethylene in the ethylene-based copolymer resin is 17 to 24% by weight.

In the present invention, the MFR (Melt Flow Ra
te) is measured according to condition 4 in Table 1 of JIS K7210 (flow test method for thermoplastics). The content of the comonomer in the copolymer resin,
In addition to various acrylic acid esters or various methacrylic acid esters represented by the above general formula CH ₂ ═CR ₁ COOR ₂ , vinyl acetate is also included when an ethylene-vinyl acetate copolymer resin is blended. The ethylene-vinyl acetate copolymer resin is blended in order to improve physical properties such as flexibility and curl resistance.

The various acrylic acid esters or various methacrylic acid esters of the above-mentioned comonomers are not particularly limited, and examples thereof include methyl methacrylate, methyl acrylate, ethyl acrylate, butyl methacrylate, hexyl acrylate, lauryl methacrylate, and acrylic. Stearyl acid and the like can be preferably used.

The ethylene / acrylic copolymer resin, a mixed resin thereof, or an ethylene copolymer resin obtained by blending an ethylene / vinyl acetate copolymer resin with the ethylene / acrylic copolymer resin is processed at the time of film formation and processed into a decorative sheet. In view of curl resistance, foaming resistance, scratch resistance, flame retardancy, touch, etc., the comonomer content relative to ethylene is 1
It is preferably 7 to 24% by weight, and its MFR
Is preferably 4.5 or less.

The MFR of the ethylene copolymer resin is 4.
When it exceeds 5, the processability during film formation, curl resistance and the like are deteriorated, and when the content of the comonomer is less than 17% by weight, the curl resistance and flame retardancy are deteriorated and the comonomer content is decreased. When the content exceeds 24% by weight, workability during film formation, scratch resistance and the like are deteriorated, which is not preferable. As the foaming agent added to such an ethylene copolymer resin, a known foaming agent that decomposes by heat to generate a gas can be used. For example, azodicarbonamide (ADCA), 4, 4 ′. -Oxybis (benzenesulfonylhydrazide) (OBSH), paratoluenesulfonylhydrazide (TSH), dinitropentamethylenetetramine (DPT) and the like can be used alone or in combination.

Therefore, by adopting the above-mentioned constitution, since the ethylene-based copolymer resin is used as the main component of the foamable resin layer, it is not necessary to add a plasticizer, and the plasticizer is not changed over time. It does not easily migrate to the surface and stain the surface or harden the foamable resin layer and easily cause cracks, and it has stable flexibility for a long period of time, and has processability, foamability, and It is possible to provide a decorative sheet that is excellent in curl resistance, scratch resistance, flame retardancy, etc., and does not generate toxic gases such as chlorine even when burned, and is also safe and environmentally friendly. it can.

According to a second aspect of the invention, the ethylene / acrylic copolymer resin of the foamable resin layer is ethylene-
The decorative sheet according to claim 1, which is a methyl methacrylate copolymer resin.

As the ethylene / acrylic copolymer resin for the foamable resin layer, as described above, ethylene-methyl methacrylate copolymer resin, ethylene-methyl acrylate copolymer resin, ethylene-ethyl acrylate copolymer resin. , Ethylene-butyl methacrylate copolymer resin, ethylene-hexyl acrylate copolymer resin, ethylene-lauryl methacrylate copolymer resin, ethylene-stearyl acrylate copolymer resin and the like can be preferably used, but among them, ethylene -Methyl methacrylate copolymer resin has good processability, has appropriate flexibility and scratch resistance, and is excellent in overall performance as a foamable resin layer such as foamability and curl resistance. It can be used particularly preferably.

Therefore, by adopting the above structure, in addition to the function and effect of the invention described in claim 1,
It is possible to obtain a decorative sheet which has better processability and is excellent in performance such as flexibility, scratch resistance, foaming property and curl resistance.

The invention described in claim 3 is the decorative sheet according to claim 1 or 2, wherein a flame retardant is added to the foamable resin layer.

As the above-mentioned flame retardant, a known flame retardant can be used. In the present invention, the foamable resin layer is formed so that no harmful gas such as chlorine gas or hydrochloric acid gas is generated when the decorative sheet is burned. The above-mentioned ethylene-based copolymer resin is used as the resin, and similarly for the flame retardant, it is particularly preferable to use a flame retardant other than an organic halogen compound such as an organic chlorine compound or an organic bromine compound. Examples of such flame retardants include aluminum hydroxide, magnesium hydroxide, metal hydroxides such as calcium hydroxide, antimony trioxide, antimony pentoxide, antimony borate, antimony molybdate, zinc borate, and the like.
Inorganic oxides such as zinc stannate, titanium dioxide, boric acid, and triallyl phosphate, alkylallyl phosphate, alkyl phosphate, dimethyl phosphate, phosphorinate, trimethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl. Phosphate ester or phosphorus compound such as phosphate, octyl diphenyl phosphate, tricresyl phosphate, cresyl phenyl phosphate, triphenyl phosphate, polyphosphonate, polyphosphate, aromatic polyphosphate, phosphonate type polyol, phosphate type polyol, etc. Polyol compound, other, silicone polymer, ferrocene, fumaric acid, maleic acid, triazine compound, melamine cyanu Over door, isocyanurate, urea,
A guanidine compound or the like can be used.

By adopting such a constitution, in addition to the function and effect of the invention described in claim 1 or 2, flame retardancy can be imparted to the ethylene copolymer resin of the foamable resin layer. The flame retardancy of the decorative sheet can be improved.

The invention according to claim 4 is characterized in that a primer layer is provided between the foamable resin layer and the printing ink layer, and a protective layer is provided on the printing ink layer. The decorative sheet according to any one of 1 to 3.

The primer layer is provided to improve the adhesiveness of the printing ink layer to the foamable resin layer, and is an emulsion or dispersion of, for example, an acrylic resin, an olefin resin, an ethylene-vinyl acetate copolymer resin or the like. It can be provided by a method of applying a coating material, and drying by heating to form a film. In addition, the protective layer provided on the printing ink layer (pattern printing layer) is provided to improve the abrasion resistance and scratch resistance of the printing ink layer as well as the heat resistance, and is particularly limited. Although it is not peeled off, for example, it can be provided by applying a coating solution of a transparent resin such as acrylic resin and drying it.

By adopting such a constitution, in addition to the function and effect of the invention described in any one of claims 1 to 3, the primer layer further improves the adhesiveness of the printing ink layer, and the protective layer. Thus, the surface properties such as abrasion resistance, scratch resistance, and heat resistance of the printing ink layer (pattern printing layer) can be further improved.

The invention according to claim 5 is the decorative sheet according to any one of claims 1 to 4, wherein the surface of the decorative sheet is embossed.

The embossing may be thermal embossing by a mechanical method or so-called chemical embossing. By adopting such a configuration, in addition to the function and effect of the invention described in any one of claims 1 to 4, it is possible to improve the designability of the decorative sheet, and particularly to print an embossing pattern on the lower layer. The design of the decorative sheet can be further improved by synchronizing with the pattern of the ink layer.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to the drawings. 1 and 2 are schematic cross-sectional views showing the structure of an embodiment of the decorative sheet of the present invention. In each drawing, (a) is a schematic cross-sectional view before foaming and (b) is after heat-foaming. It is a schematic cross section. However, the present invention is not limited to these drawings as long as the gist thereof is not exceeded. The decorative sheet 10 shown in (a) and (b) of FIG.
A foamable resin layer 2 is provided on a base material (backing layer) 1, and a printing ink layer (pattern printing layer) 3 is provided thereon.

For the base material (backing layer) 1, paper, cloth or the like can be appropriately selected and used depending on the application of the decorative sheet. When using paper, it is preferable to use flame-retardant paper, and usually paper having a basis weight of about 50 to 120 g / m ² is used. When using cloth, in addition to ordinary woven cloth, non-woven cloth or woven cloth containing inorganic fibers such as glass fibers can be used.

The expandable resin layer 2 is, as described above,
Ethylene and the general formula “CH ₂ ═CR ₁ COOR ₂ ”, wherein R ₁ is H or CH ₃ and R ₂ is an alkyl group. ] An ethylene-acrylic copolymer resin obtained by copolymerizing an acrylic ester or a methacrylic ester represented by or a mixed resin thereof, or an ethylene copolymer resin obtained by blending an ethylene-vinyl acetate copolymer resin therewith. It is formed of a resin composition comprising a main component and at least a foaming agent added thereto, and the ethylene / acrylic copolymer resin or a mixed resin thereof, or an ethylene-vinyl acetate copolymer resin blended therewith. The ethylene copolymer resin has an MFR of 4.5 or less, and the ethylene copolymer resin has a comonomer content with respect to ethylene, that is, an acrylic acid ester, a methacrylic acid ester, or a vinyl acetate content of 17%.
% To 24% by weight, and as an additive, in addition to a foaming agent, if necessary, a foaming aid, a foam cell regulator, an inorganic filler, a flame retardant, a lubricant, an antistatic agent,
A light stabilizer, an antioxidant, an antibacterial agent, an antifungal agent, a pigment and the like can be added as appropriate.

The expandable resin layer 2 can be formed into a desired thickness by a calendar method or an extrusion coating method, and at the same time, can be heat-bonded and laminated on the base material (backing layer) 1. The surface of the foamable resin layer 2 may be subjected to an easy-adhesion treatment such as corona discharge treatment or ozone treatment in order to improve the adhesiveness of the printing ink layer 3 provided thereon, that is, the pattern printing layer. preferable. Foaming resin layer 2
The thickness can be appropriately set depending on the application of the decorative sheet, but is generally about 80 to 200 μm before foaming.

The printing ink layer (pattern printing layer) 3 is required to have good adhesiveness to the foamable resin layer 2 as the lower layer and have light resistance, heat resistance, scratch resistance, stain resistance and the like. However, there is no particular limitation on the ink type or printing means used, and for example, using an ink having an acrylic resin as a binder, multicolor gravure printing,
Alternatively, it can be easily provided by means such as silk screen printing or flexographic printing.

The film-forming of the foamable resin layer 2 is carried out at a temperature lower than the foaming temperature of the foaming agent, usually at a temperature of about 120 to 170 ° C., as shown in FIG. A non-foamed decorative sheet 10 is obtained, which is passed through a heating and foaming furnace and heated to 180 to 220 ° C. to decompose the foaming agent contained in the foamable resin layer 2 to generate a gas. As shown in (B) of 1, the foamed cell A can be formed inside the foamable resin layer 2 to manufacture the foamed decorative sheet 10. The expansion ratio of the foamable resin layer 2 can be adjusted by the kind and addition amount of the foaming agent, the heating temperature, etc., and can usually be expanded in the range of about 2 to 7 times.

The decorative sheet 20 shown in FIG. 2 is the same as that shown in FIG.
In order to improve the adhesiveness of the printing ink layer (pattern printing layer) 3 to the foaming resin layer 2 in the configuration of the decorative sheet 10 shown in FIG. 2, a space between the foaming resin layer 2 and the printing ink layer (pattern printing layer) 3 is used. Is additionally provided with a primer layer 4, and
In order to improve abrasion resistance, scratch resistance, stain resistance, etc. of the printing ink layer (pattern printing layer) 3, a protective layer 5 is additionally provided on the printing ink layer (pattern printing layer) 3, and further, In order to further improve the design of the decorative sheet 20, as shown in FIG. 2B, the surface of the decorative sheet 20 is embossed to form the embossed portion B. The shape of the embossed portion B shown in FIG. 2B simply indicates that the surface of the decorative sheet 20 is embossed, and the concavo-convex pattern and the depth thereof are arbitrary. It can be formed into a shape.

Such embossed portion B may be formed by a mechanical embossing method or a chemical embossing method. When the embossed portion B is formed by the mechanical embossing method, for example, as shown in FIG. 2A, the foamable resin layer 2, the primer layer 4, the printing ink layer are formed on the base material (backing layer) 1. (Design print layer) 3, protective layer 5
To form an unfoamed decorative sheet 20 and pass through a heating and foaming furnace in the same manner as the decorative sheet 10 shown in FIG.
After heating the foamable resin layer 2 by heating at 80 to 220 ° C., the surface of the decorative sheet 20 is heated and embossed with an embossing roll or the like to obtain an embossed portion B having an uneven pattern.
Can be formed. The depth of the embossed portion B is
As described above, depending on the uneven shape of the embossing roll or the like, it may be formed deeper, for example, to a depth reaching the inside of the foamable resin layer 2.

When the embossed portion B is formed by the chemical embossing method, for example, when the unfoamed decorative sheet 20 having the structure shown in FIG. By adding the foaming suppressor to a part or all of the pattern printed layer 3), when the foamable resin layer 2 is heated and foamed in a heating and foaming furnace, the foamed resin layer 2 has a pattern shape to which the foaming suppressor is added. The foaming inhibitor penetrates into the foamable resin layer 2 from the printing ink layer to suppress the foaming of that portion, so that the portion becomes a concave portion in a pattern and the other portion is foamed in a convex shape. Since the portion is formed, it is possible to easily form a concave-convex pattern in synchronization with the printed pattern, and it is possible to further improve the designability of the decorative sheet 20.

[0032]

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples. A decorative sheet used for wallpaper is prepared, and a decorative sheet having a structure in which a base material (backing layer), a foamable resin layer, a primer layer, a printing ink layer (three colors of a pattern printing layer), and a protective layer are sequentially laminated is given below. It was produced by using the material of. In the examples and comparative examples, a common material is used for the base material (backing layer), the primer layer, the printing ink layer (three colors of the pattern printing layer), and the protective layer among the above-mentioned configurations, and the foamable resin layer is used. Among the blends of ethylene copolymer resin and additives used in
The decorative sheets of Examples 1 to 4 and Comparative Examples 1 to 5 were produced by changing only the composition of the ethylene copolymer resin as shown in Table 1. The foamable resin layer is formed by a calendering method at a roll temperature of 150 ° C. and a thickness of 13
The film is formed so as to have a thickness of 0 μm, and is heat-bonded and laminated on a base material (backing layer). The foaming of the foamable resin layer is carried out by passing each unfoamed decorative sheet through a heating foaming furnace at 180 ° C. for about 10 seconds for foaming.

The base material (backing layer) has a basis weight of 70 g / m.
² semi-flame retardant paper was used. For the primer layer, an emulsion of ethylene-vinyl acetate copolymer resin was used, which was applied so that the thickness when dried was 2 μm, and dried by heating to form a film. The printing ink layer (three colors of the pattern printing layer) was printed with a grain pattern by gravure printing using an acrylic binder ink. The protective layer was formed by printing a transparent acrylic resin solution (with a slip agent added) on the entire surface by gravure printing so that the thickness when dried was 3 μm. For the foamable resin layer, a resin composition composed of an ethylene-based copolymer resin having the composition shown in Table 1 below and an additive was used.

[0034]

[Table 1]

In Table 1, ADCA of the foaming agent is azodicarbonamide and OBSH is 4,4'-oxybis (benzenesulfonylhydrazide). Further, the zinc compound as the foam cell regulator improves the foamability of the foamable resin layer and the uniformity of foaming. When ZnO (zinc white) as a foaming aid is used, the foaming temperature of the foaming agent, that is, the decomposition start temperature is lowered to improve the foamability of the foamable resin layer, and at the same time, the decorative sheet is reduced due to the lowering of the foaming temperature. Prevents heat deterioration of the material, quality of the decorative sheet,
The performance can be improved. The inorganic fillers aluminum hydroxide and titanium oxide are white colorants and at the same time have an action as a flame retardant. Zinc stearate as a lubricant has a function as a foaming aid as well as a lubricant. The silicone-based flame retardant not only imparts flame retardancy to the ethylene-based copolymer resin, but also adjusts the melt tension of the resin and densifies the foamed cells.

With respect to the decorative sheets of Examples 1 to 4 and Comparative Examples 1 to 5 produced as described above, the following items were measured and performances were evaluated, and the results are summarized in Table 2. (1) The content of the comonomer (MMA, VA) in the ethylene-based copolymer resin of the expandable resin layer is shown by weight%. (2) The MFR of the ethylene-based copolymer resin of the foamable resin layer was measured and the numerical value was shown. Unit [g / 10 min] (3) Flame retardancy: The flame retardancy levels were compared with each other, and those with a high flame retardancy level were shown as ◯, those with a moderate flame retardancy level were as Δ, and those with a low level were shown as x. (4) Curling resistance: Regarding the size of curling and its strength,
A sample with a small curl and a weak repulsive force is shown as O, a sample with a little curl and a little repulsive force is shown as A, and a sample with a large curl and a large repulsive force is shown as X. (5) Workability: The good workability such as film formation by calender molding of the resin composition of the expandable resin layer is shown as ◯ for good, Δ for slightly inferior, and x for inferior. (6) Foamability: Regarding the foaming ratio of the foamable resin layer and the denseness of the foamed cells, those with a foaming ratio of 4 times or more and the foamed cells having excellent compactness are ◯, slightly inferior, and inferior. Is shown as x. (7) Scratch resistance: When the same position on the surface of the decorative sheet was rubbed 30 times with a nail, scratches were scarcely shown, ◯, slight scratches were shown as Δ, and many scratches were shown as x.

[0037]

[Table 2] Although not shown in Table 2, in the decorative sheet of the present invention, an ethylene-based copolymer resin was used as the resin of the expandable resin layer, and no polyvinyl chloride-based resin was used. Since the use of compounds containing halogen elements such as chlorine and bromine has also been stopped for other constituent materials such as combustion agents, even if the decorative sheet is burned, no harmful gas such as hydrochloric acid gas or chlorine gas is generated, and safety is maintained. It was also excellent in terms.

As is clear from the above results, Example 1
In the decorative sheets of Nos. 4 to 4, the content of the comonomer (MMA, VA) in the ethylene copolymer resin of the expandable resin layer is 17 to.
24% by weight, and the MFR of the ethylene-based copolymer resin is 4.5 or less. In addition to the foaming agent, necessary additives such as a flame retardant and a lubricant are appropriately added to these ethylene-based copolymer resins. Since the foamable resin layer is formed of the resin composition added to, the flame retardancy described in (3) to (7) above,
Curl resistance, processability in calendar molding, foamability,
Good results were obtained in all items such as scratch resistance.

On the other hand, in the decorative sheet of Comparative Example 1, the content of comonomer in the ethylene copolymer resin was 25.
Since the content of the comonomer is 16% by weight, the decorative sheet of Comparative Example 2 has a small content of 16% by weight because the ethylene-based copolymer resin has a large MFR of 7 and thus is slightly inferior in processability and foamability. Since the MFR is as large as 7, the flame retardancy and the curl resistance are poor, and the workability and the scratch resistance are also slightly poor. In addition, the decorative sheet of Comparative Example 3 has the above M
Since FR is 5 and somewhat large, processability and foamability are slightly inferior, and since the decorative sheet of Comparative Example 4 has a large comonomer content of 26% by weight, processability and foamability are inferior.
Scratch resistance is also slightly inferior. The decorative sheet of Comparative Example 5 had a low comonomer content of 16% by weight, and thus was inferior in flame retardancy, curl resistance, workability, and scratch resistance. Comparative Example 1 as described above
All of the decorative sheets of Nos. 5 to 5 were inferior in at least two items among the items described in (3) to (7), and the decorative sheets of Examples 1 to 4 were obviously excellent in performance.

[0040]

As described above in detail, according to the present invention, interior materials for buildings such as wallpaper, floor materials, and ceiling materials, surface coating materials for other furniture, home appliances, leather, book covers, etc. A decorative sheet that can be used in a wide range of applications such as surface materials, in which a foamable resin layer made of a resin composition using an ethylene-based copolymer resin is laminated on the intermediate layer, etc., and its processability, foamability, curl resistance In addition to being excellent in performance such as scratch resistance and flame retardancy, it has good flexibility and touch, and since it does not use polyvinyl chloride resin or compounds containing halogen elements such as chlorine and bromine as its constituent materials. In addition, it does not generate harmful gas such as hydrochloric acid gas or chlorine gas even when burned by fire or incineration after use, and it is effective in providing cosmetic sheets with excellent safety and environmental suitability. Play.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a configuration of an embodiment of a decorative sheet of the present invention, (a) is a schematic cross-sectional view before foaming, (b).
[FIG. 4] is a schematic cross-sectional view after heat-foaming.

FIG. 2 is a schematic cross-sectional view showing the structure of another embodiment of the decorative sheet of the present invention, (a) is a schematic cross-sectional view before foaming,
(B) is a schematic cross-sectional view after heat-foaming and further embossing.

[Explanation of symbols]

1 Base material (lining layer) 2 Foamable resin layer 3 Printing ink layer (picture printing layer) 4 Primer layer 5 protective layer A foam cell B embossing section 10, 20 Decorative sheet

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nobuyuki Ono             1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo             Dai Nippon Printing Co., Ltd. F term (reference) 4F100 AK25 AK68B AK70B AL05B                       AS00D AT00A BA03 BA04                       BA07 BA10A BA10C CA01B                       CA08B DG10 DJ01B EJ39D                       EJ65B EJ91D GB08 HB00                       HB21D HB31C JA06B JK14                       JL00 JL04 JM01 JN01

Claims (5)

[Claims] 1. A decorative sheet obtained by heat-foaming a laminate in which at least a foaming resin layer and a printing ink layer are laminated on a substrate (backing layer), wherein the foaming resin layer is ethylene and a general formula. (1) CH ₂ ═CR ₁ COOR ₂ (1) [In the formula, R ₁ is H or CH ₃ , and R ₂ is an alkyl group. ] An ethylene / acrylic copolymer resin obtained by copolymerizing an acrylic ester or a methacrylic ester represented by: or a mixed resin thereof, or an ethylene copolymer resin obtained by blending an ethylene-vinyl acetate copolymer resin therewith. It is formed of a resin composition comprising a main component and at least a foaming agent added thereto, and the ethylene / acrylic copolymer resin or a mixed resin thereof, or an ethylene-vinyl acetate copolymer resin blended therewith. MFR of ethylene copolymer resin is 4.5
It is below, and the content of the comonomer with respect to ethylene in those ethylene-type copolymer resin is 17 to 24 weight%, The decorative sheet characterized by the above-mentioned. 2. The decorative sheet according to claim 1, wherein the ethylene / acrylic copolymer resin of the foamable resin layer is an ethylene-methyl methacrylate copolymer resin. 3. The decorative sheet according to claim 1, wherein a flame retardant is added to the foamable resin layer. 4. A primer layer is provided between the foamable resin layer and the printing ink layer, and a protective layer is provided on the printing ink layer. The described decorative sheet. 5. The decorative sheet according to claim 1, wherein the surface of the decorative sheet is embossed.