JPH1058607A - Decorative sheet - Google Patents

Abstract

(57) [Abstract] [Problem] A decorative sheet using polyvinyl chloride has a problem of environmental pollution due to generation of chlorine gas when discarded and incinerated. There has been a demand for a decorative sheet having good folding workability. SOLUTION: A polyolefin resin is used as a thermoplastic resin sheet 11, a primer layer 16 is formed on the back surface of the thermoplastic resin sheet 11, and a print layer 12 is formed on the front surface to produce a print sheet. The printing sheet and the acrylic resin sheet 13 are overlapped, and both sheets are laminated by the doubling embossing method, and at the same time, an embossed pattern 15 is formed on the surface of the acrylic resin sheet 13 and the glass transition point is 50
Below ℃, weight average molecular weight 100,000 or more acrylic resin, using a paint consisting of a mixed solvent of IPA and ethyl acetate,
The decorative sheet 1 is formed by forming the top coat layer 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of decorative sheets used for building materials such as furniture members and fittings, and for surface decoration of electric appliances such as refrigerators and TV cabinets, and in particular, wood grain print patterns and the like. The present invention relates to a decorative sheet that reproduces a state close to a natural tree, has excellent weather resistance, and has good workability such as bending.

[0002]

2. Description of the Related Art Conventionally, the following three types of decorative sheets have been known as decorative sheets used for such purposes. (1) A polyvinyl chloride sheet decorated with printing, embossing or the like (Japanese Patent Publication Nos. 28-5036 and 58-14312). (2) Those using a polyolefin resin sheet such as polyethylene or polypropylene instead of polyvinyl chloride (JP-A-54-62255). (3) A polyolefin-based thermoplastic elastomer is mixed with a polyolefin resin obtained by graft-polymerizing a polar functional group (JP-A-6-210808, JP-A-4-5808).
No. 04384) or mixing a polyolefin resin with a polyurethane resin using a compatibilizer (Japanese Patent Laid-Open No. 7-26).
No. 038), there are the following disadvantages of the decorative sheet of (1) and the following disadvantages of the decorative sheet of (2).

[0003]

The decorative sheet using the polyvinyl chloride sheet as described in the above (1) has a problem that heat resistance is insufficient or surface stain resistance is poor. . Further, in the case of the conventional decorative sheet as described in (2), although the defect of the decorative sheet using polyvinyl chloride can be improved, transparency is insufficient. Insufficient heat resistance. Poor weather resistance. Inflexible. Insufficient adhesion to ink and adhesive during printing and lamination. After forming a V-shaped or U-shaped groove on the back surface of the decorative material with a decorative sheet laminated on the front surface, the decorative material is bent (V-shaped or U-shaped) The process of forming a groove and bending the decorative material is referred to simply as V
Called cutting. ), The decorative sheet cracks and breaks. In particular, the heat history at the time of embossing from heating softening to embossing plate pressing to cooling causes crystallization to progress and the sheet becomes brittle, and this tendency is strengthened. Furthermore, due to the high crystallinity,
Very narrow embossing conditions. And so on.
Furthermore, even in the decorative sheet as in (3),
The disadvantage of the sheet (2) was hardly solved.

Further, the present inventors have studied a decorative sheet having a structure in which a protective sheet of an acrylic resin is laminated on a sheet substrate of a polyolefin resin. However, when a decorative sheet having an acrylic resin protective sheet is laminated and subjected to a V-cut process on the decorative material, the acrylic resin protective sheet is cracked or the protective sheet is whitened. was there.

It has been found that the decorative sheet of the present invention can solve the above-mentioned disadvantages of a decorative sheet having a structure in which a protective sheet made of an acrylic resin is laminated on the surface of a polyolefin resin sheet substrate by adopting the constitution of the present invention. Thus, the present invention has been completed.

[0006]

Means for Solving the Problems In order to solve the above problems, the structure of the decorative sheet is as follows. On one surface of the thermoplastic resin sheet, a printing ink layer and an acrylic resin sheet are sequentially laminated, and in a decorative sheet having an embossed and top coat layer formed on the surface of the acrylic resin sheet, the top coat layer has a glass transition point. Is a decorative sheet characterized by being formed using an acrylic resin having a weight average molecular weight of 100,000 or more at 50 ° C. or less, and a paint made of a composition of isopropyl alcohol and ethyl acetate. Moreover, the said thermoplastic resin sheet was used as the decorative sheet which is a polyolefin resin.

Further, a decorative sheet is provided in which a colored ink layer is applied to the concave portion of the embossed pattern by a wiping method. And the glass transition point is 50 as the coloring ink.
A decorative sheet having a colored ink layer formed using an acrylic resin having a weight average molecular weight of 100,000 or more, a mixed solvent of isopropyl alcohol and ethyl acetate, and a colored ink containing a colorant as a main component at a temperature of not more than 100 ° C. . Further, a decorative sheet having a primer layer formed on the back surface of the decorative sheet was used.

According to the present invention, a printing ink layer and an acrylic resin sheet are sequentially laminated on one side of a thermoplastic resin sheet,
After forming an embossed pattern on the surface of the acrylic resin sheet, an acrylic resin having a glass transition point of 50 ° C. or less and a weight average molecular weight of 100,000 or more, isopropyl alcohol and acetic acid as a top coat layer thereon. The decorative sheet was formed using a paint comprising a mixed solvent of ethyl, and was excellent in V-cut suitability and bending workability, and was excellent in weather resistance.

Further, in order to enhance the design of the decorative sheet, the concave portion of the embossed pattern of the decorative sheet is filled with a coloring ink by a wiping method, and the same resin as the top coat layer is used as a binder of the coloring ink. In addition to increasing the adhesive strength between the layers, an adhesive primer layer is formed on the back surface of the decorative sheet to increase the adhesive strength between the decorative sheet and the substrate to be bonded, thereby improving V-cut suitability and bending workability. planned.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an enlarged sectional view showing an example of the decorative sheet of the present invention, and FIG. 2 is an enlarged sectional view showing another example of the decorative sheet of the present invention. FIG. 3 is an explanatory diagram for producing a decorative sheet, and FIG. 4 is an explanatory diagram for producing another type of decorative sheet. FIG. 5 is an explanatory diagram for producing a decorative sheet according to the second embodiment.

As shown in FIG. 1, the decorative sheet 1 of the present invention has a printed layer 12 formed on the surface of a thermoplastic resin sheet 11 having a primer layer 16 formed on the back surface, and a transparent surface on the printed sheet. An acrylic resin sheet 13 is laminated, an embossed pattern 15 is formed on the surface of the acrylic resin sheet 13 of the laminated sheet, and a top coat layer 14 is further formed thereon. Further, as shown in FIG. 2, a decorative sheet according to another embodiment of the present invention is a decorative sheet 1 shown in FIG.
The concave ink 15a of the embossed pattern 15 is filled with a coloring ink 17 by a wiping method, and the top coat layer 14 is further formed thereon.

The top coat layer 14 has a glass transition point of 40 ° C. or less and a weight average molecular weight of 100,0.
A top coat layer is formed by applying and drying a paint containing a mixed solvent of at least 00 acrylic resin, isopropyl alcohol (hereinafter referred to as IPA) and ethyl acetate (hereinafter referred to as ethyl acetate). By forming the top coat layer using the paint having the above composition, a decorative sheet excellent in V-cut suitability and bending workability and having good weather resistance could be obtained.

When a polyolefin resin sheet is used as the thermoplastic resin sheet, it is possible to print directly on the polyolefin resin sheet itself or to apply an adhesive, but it is also possible to use a printing ink or an adhesive to bond the polyolefin resin sheet to the polyolefin resin sheet. When it is necessary to further strengthen the force, the surface of the polyolefin resin sheet is subjected to an easy-adhesion treatment by applying an easy-adhesive agent, corona discharge treatment, plasma treatment or the like. In the decorative sheet of the present invention, as the easily adhesive layer (also called a primer layer or an anchor layer), acrylic, vinyl chloride-vinyl acetate copolymer, polyester,
Polyurethane, chlorinated polypropylene, chlorinated polyethylene and the like are used, and chlorinated polypropylene is particularly desirable.

Examples of the acrylic 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, poly (methyl meth) acrylate means polymethyl acrylate or polymethyl methacrylate, and the following (meth) has the same meaning.

Polyurethane is mainly composed of a polyol (polyhydric alcohol) and isocyanate as a crosslinking agent (curing agent).
Polyurethane. The polyol has two or more hydroxyl groups in the molecule, and examples thereof include polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, and polyether polyol.

As the isocyanate, a polyvalent isocyanate having two or more isocyanate groups in a molecule is used. For example, 2-4 tolylene diisocyanate,
Aromatic isocyanates such as xylene diisocyanate, 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 refers to coloring by adding a pigment, printing of a pattern, embossing (heating press), shaping of a concavo-convex pattern by hairline processing, and the like.

Examples of the added pigment include inorganic pigments such as titanium white, zinc white, red iron oxide, vermilion, ultramarine, cobalt blue, titanium yellow, graphite, carbon black, isoindolinone, Hansa Yellow A, quinacridone, and permanent red 4R. ,
Organic pigments (including dyes) such as phthalocyanine blue, indathrene blue RS, and aniline black; metal pigments such as aluminum and brass; titanium dioxide-coated mica;
Pearlescent pigments made of foil powder such as basic lead carbonate. These pigments are added and dispersed as powder or flaky foil pieces. Coloring by adding pigment
Transparent coloring or opaque (concealing) coloring may be used.

As the print pattern, a pattern is formed with ink (or paint) using a known printing method such as gravure printing, offset printing, silk screen printing, transfer printing from a transfer sheet, or the like. Examples of the pattern 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 surface. The pattern is provided on the front, back, front and back surfaces, or between layers of the sheet.

As the ink (or paint), chlorinated polyolefins such as chlorinated polyethylene and chlorinated polypropylene, polyesters, polyurethanes, acrylics, vinyl acetate, vinyl chloride-vinyl acetate copolymers, and cellulosic resins are used as binders. Used alone or as a mixture of two or more. To this, those to which known pigments as listed above are added are used.

When printing directly on a polyolefin resin, chlorinated polyolefin, polyurethane or the like is preferred as a binder from the viewpoint of adhesiveness. However, if an easy-adhesion primer is appropriately selected and formed, other binders can be used. Gives good adhesion.

As the embossing, a polyolefin resin is heated and softened, pressurized and shaped with an embossing plate, and cooled and fixed, and a known sheet-fed or rotary embossing machine is used. Examples of the uneven shape include a wood grain board conduit groove, a stone board surface unevenness (granite cleavage face, etc.), a cloth surface texture, a matte finish, a grain, a hairline, a linear groove, and the like.

Further, if necessary, a colored ink can be filled into the unevenness of the uneven pattern by a known wiping method (see Japanese Patent Publication No. 58-14312, etc.). As the coloring ink, the same binder as described above is used, but from the viewpoint of abrasion resistance, a two-component curable urethane resin is preferably used as the binder.

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

The decorative sheet of the present invention is prepared as follows. First, as shown in FIG. 3A, an adhesive primer layer 16 is formed on the back surface of the thermoplastic resin sheet 11 in order to increase the adhesive strength with a base material such as plywood.
The surface of the thermoplastic resin sheet 11 is subjected to a corona treatment according to a conventional method in order to increase the adhesive strength with the printing ink. On the surface of the thermoplastic resin sheet 11 subjected to the corona treatment, the concealable solid printing layer 12 is usually formed by gravure printing.
b and the pattern print layer 12a are formed to produce the print sheet 2.

Next, as shown in FIG. 3 (b), an acrylic resin sheet 13 is laminated on the printing surface of the printing sheet 2, and an embossed pattern 1 is formed on the surface of the acrylic resin sheet.
5 to form a laminated sheet 3. The laminated sheet is
Usually, it is produced by a known doubling embossing method. That is, as shown in FIG.
And the acrylic resin sheet 13 are overlapped, and this is used by using an embossing roll having an embossed pattern so that the acrylic resin sheet 13 contacts the embossing roll,
By heating and pressing, the printed sheet and the acrylic resin sheet are heated and melted and laminated, and at the same time, the embossed pattern 15 is formed on the surface of the acrylic resin sheet to produce the laminated sheet 3.

The thickness of the acrylic resin sheet is 20 to 10
Although it can be used in the range of 0 μm, it is preferably 30 to 7 μm.
5 μm is preferred. Examples of the embossed irregularities include a wood grain conduit groove, a hairline, a linear groove, a sand grain, and a satin finish.
As the acrylic resin, poly (meth) acrylate, poly (meth) acrylate, poly (meth) acrylate
Propyl acrylate, poly (butyl methacrylate),
Methyl (meth) acrylate / butyl (meth) acrylate copolymer, ethyl (meth) acrylate / butyl (meth) acrylate copolymer, ethylene / methyl (meth) acrylate copolymer, styrene / (meth) Acrylic resins comprising a homo- or copolymer containing a (meth) acrylate such as a methyl acrylate copolymer. Here, poly (methyl meth) acrylate means poly (methyl acrylate) or poly (methyl methacrylate), and hereinafter (meth) has the same meaning.

Further, as shown in FIG. 3C, a transparent top coat layer 14 is formed on the embossed pattern 15 of the laminated sheet 3 on which the embossed pattern is formed to form a decorative sheet 1.
And As described above, the top coat layer 14 has a glass transition point of 40 ° C. or higher and a weight average molecular weight of 100,00.
A top coat layer 14 is formed by applying and drying a known coating method such as a gravure coat or a roll coat using a paint composed of 0 or more acrylic resin and a mixed solvent of IPA and ethyl acetate. The thickness of the top coat layer is 1 to
It is formed in a range of 10 μm, preferably, 2 to 3 μm.
The range of m is good. If it is less than 1 μm, the protective effect as a top coat layer cannot be sufficiently obtained. Further, even if it exceeds 10 μm, the protection effect is not further improved,
The suitability for bending by V-cut may worsen if the thickness of the top coat layer is increased more than necessary. Further, if the top coat layer is made thicker than necessary, it is disadvantageous in terms of cost.

When the glass transition point (Tg) of the acrylic resin used for the top coat layer exceeds 50 ° C., the acrylic resin becomes hard, and cracks occur during bending, so that the object of the present invention cannot be achieved. When the weight average molecular weight of the acrylic resin is less than 100,000, the softening point of the resin becomes too low, so that the acrylic resin is likely to be blocked during the production process of the decorative sheet, which causes trouble during operation.

As a solvent for dissolving the acrylic resin, a mixed solvent of alcohol and acetate is used, and by increasing the number of alcohols, it is possible to reduce the attack by the solvent and to prevent cracking during bending. I was able to. Usually, as the solvent, a mixed solvent of IPA and ethyl acetate is used, and the mixing ratio is 10:
It can be used in the range of 0 to 4: 6, but is preferably 6: 4.
4 is good. If the ratio of ethyl acetate is higher than 4: 6, the solvent resistance of the acrylic resin is deteriorated, and the coating of the top coat layer is easily attacked by the solvent.

As the thermoplastic resin sheet of the present invention, a polyolefin resin is used. Polyolefin resins include polyethylene (PE) and polypropylene (P
E), ethylene / propylene copolymer, ethylene / butene-1 copolymer, propylene / butene-1 copolymer, polybutene-1, butene-1 / propylene / ethylene 3
Copolymer, butene-1, hexene-1, octene-1 copolymer, polymethylpentene, or JP-A-6-1-1
For example, olefin elastomers described in JP-A-6832 and the like can be used. The sheet has a thickness in the range of 50 to 200 μm, preferably about 100 μm, and either a stretched sheet or an unstretched sheet can be used. However, an unstretched sheet is more suitable for processing such as V-cut processing. Good.

The above-mentioned polyolefin resin may be used alone, but may be added with various rubbers to impart flexibility, impact resistance and easy adhesion to the polyolefin resin. As the rubbers, diene rubbers, hydrogenated diene rubbers, olefin elastomers and the like are used, and among them, hydrogenated diene rubbers are preferable. A hydrogenated diene rubber is used as a modifier for a polyolefin resin, and has a function of suppressing crystallization of the polyolefin resin and improving flexibility and transparency. Further, generally, when a diene rubber is added to a polyolefin resin, the weather resistance and heat resistance are lower than those of the polyolefin resin to which the diene rubber is not added because of the double bond of the diene rubber. By using a hydrogenated diene rubber having a double bond saturated with hydrogen, a decrease in the weather resistance and heat resistance of the polyolefin resin was prevented.

As the diene rubber before hydrogenation,
Isoprene rubber, butadiene rubber, butyl rubber, propylene / butadiene rubber, acrylonitrile / butadiene rubber, acrylonitrile / isoprene rubber, styrene /
Butadiene rubber and the like. The addition amount of the diene rubber is 1 to 90 parts by weight based on 100 parts by weight of the polyolefin resin.
A range of parts by weight can be used. If the amount is less than 1 part by weight, the elasticity, elongation and impact resistance are insufficient, and cracks and cracks are liable to occur during V-cutting and bending. On the other hand, when the amount is 90 parts by weight, the elasticity and elongation are too large, which is not preferable as a printing substrate.

As another embodiment of the decorative sheet of the present invention, as shown in FIG. 2, there is a decorative sheet in which the concave portion 15a of the embossed pattern 15 is filled with a coloring ink to enhance the design.
In the decorative sheet of the present invention, as shown in FIGS. 4A and 4B, the print sheet 2 and the laminated sheet 3 are produced in the same manner as the above-described decorative sheet. Next, as shown in FIG. 4C, the embossed pattern 15 formed on the surface of the laminated sheet 3 is formed.
A colored ink is applied to the entire surface including the recessed portion by a doctor blade coating method or a knife coating method, and immediately, the ink on the surface other than the recessed portion is removed by a wiping method, and the colored ink is applied to the embossed recessed portion 15a. 17
Fill. Further, as shown in FIG. 4D, a top coat layer 14 is formed on the embossed pattern surface of the laminated sheet in which the coloring ink 17 is filled in the embossed pattern recesses 15a, similarly to the above-described decorative sheet. Do one.

As for the ink composition of the coloring ink 17, the same acrylic resin and solvent as the top coat layer are used as the ink binder and solvent in order to improve the adhesion to the top coat layer. A coloring agent for wiping was obtained by adding an agent. That is, as the binder resin, an acrylic resin having a glass transition point of 50 ° C. or less and a weight average molecular weight of 100,000 or more is used, and the solvent is IP.
Using a mixed solvent of A and ethyl acetate, and as a colorant, a coloring pigment such as an organic pigment or a bright pigment, and a binder resin such as a thermoplastic resin, a thermosetting resin, or an ionizing radiation-curable resin. Was added to obtain a gravure ink.

[0036]

The present invention will be described below in more detail with reference to examples. (Example 1) As shown in FIG. 3A, as a thermoplastic resin sheet 11, a surface having a surface subjected to corona treatment and having a thickness of 0.1% was used.
mm polyolefin resin sheet (Tatsuno Chemical Co., Ltd.)
The product was made of “Tuff Per TKPS ADIS”), and an adhesive primer was applied to the back surface of the primer layer 16 in order to improve the adhesion with the emulsion adhesive.
A solid print layer 12b and a picture print layer 12a were formed on the surface of the polyolefin resin sheet using a gravure ink ("Chemical X Ink" manufactured by Showa Ink Industries, Ltd.). Next, as shown in FIG.
A 30 μm-thick transparent acrylic resin film 13 (“HBS-027” manufactured by Mitsubishi Rayon Co., Ltd.) is superimposed on the printing surface of the above, and doubling embossing and bonding are performed under the following conditions. An embossed pattern 15 was formed on the surface. Embossing conditions; embossing pressure: 20 kg / cm ² , drum temperature: 120 ° C.

Further, an OP ink (A) having the following composition was applied to the embossed pattern 15 surface of the laminated sheet 3 having the embossed pattern formed thereon, and as shown in FIG. (Thickness of 3 μm) was formed to produce a decorative sheet 1. Composition of OP ink (A) ・ Acrylic resin component 30 parts by weight ・ Polyethylene wax 1 part by weight ・ Solvent (IPA / ethyl acetate = 60/40) 70 parts by weight However, the acrylic resin component has a glass transition point of 40 ° C. and a weight average. It is obtained by adding 12 parts by weight of a curing agent to 100 parts by weight of an acrylic resin having a molecular weight of 120,000.

(Example 2) As a thermoplastic resin sheet 11, a PP sheet (manufactured by Riken Vinyl Industry Co., Ltd.) having a thickness of 0.1 mm and corona-treated on both sides was used, as shown in FIG. Using the same gravure ink as in Example 1, a solid print layer 12b and a picture print layer 12a were formed on the surface of the PP sheet 11 to produce a print sheet 2. In the same manner as in Example 1, the printed sheet and the transparent acrylic resin film 13 were double-embossed and bonded to each other.
As shown in (b), an embossed pattern 15 was formed on the surface of the laminated sheet 3.

Next, the following wiping coloring ink is applied to the embossed pattern surface of the laminated sheet 3 on which the embossed pattern is formed, and excess ink is removed by the wiping method, as shown in FIG. Embossed recess 15
a was filled with the coloring ink 17. Wiping ink composition ・ Acrylic resin component 30 parts by weight ・ Colorant 5 parts by weight ・ Solvent 70 parts by weight However, the acrylic resin component is cured with respect to 100 parts by weight of an acrylic resin having a glass transition point of 30 ° C. and a weight average molecular weight of 200,000. 12 parts by weight of an agent.

Further, an OP ink (B) having the following composition is applied to the embossed surface of the laminated sheet to which the wiping coloring ink has been applied to form a top coat layer (thickness 3 as a dry matter).
0 μm) to form a decorative sheet 1 as shown in FIG. Composition of OP ink (B) ・ Acrylic resin component 30 parts by weight ・ Solvent (IPA / ethyl acetate = 60/40) 70 parts by weight However, the acrylic resin component is acrylic having a glass transition point of 30 ° C. and a weight average molecular weight of 200,000. It is obtained by adding 12 parts by weight of a curing agent to 100 parts by weight of a resin.

(Comparative Example 1) As in the case of Example 1, a printing sheet 2 was prepared as shown in FIG. 3A by using a polyolefin resin sheet tufper and gravure ink. This printing sheet 2 and transparent acrylic resin film 1
3 was double-embossed and bonded in the same manner as in Example 1 to form an embossed pattern 15 on the surface of the laminated sheet 3 as shown in FIG. On the embossed pattern surface of the laminated sheet 3 having the embossed pattern formed thereon, the following composition of O
P ink (C) is applied, and as shown in FIG.
The decorative sheet 1 was produced by forming the top coat layer 14 (thickness as dry matter: 3 μm). Composition of OP ink (C) ・ Acrylic resin component 30 parts by weight ・ Solvent (IPA / ethyl acetate = 60/40) 70 parts by weight However, acrylic resin component is acrylic having a glass transition point of 50 ° C. and a weight average molecular weight of 40,000. It is obtained by adding 12 parts by weight of a curing agent to 100 parts by weight of a resin.

Comparative Example 2 The OP layer of Comparative Example 1 was formed using an OP ink (D) having the following composition. Composition of OP ink (D) ・ Acrylic resin component 30 parts by weight ・ Solvent (IPA / ethyl acetate = 60/40) 70 parts by weight However, acrylic resin component is acrylic having a glass transition point of 90 ° C. and a weight average molecular weight of 80,000. It is obtained by adding 12 parts by weight of a curing agent to 100 parts by weight of a resin.

The decorative sheets prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were attached to plywood.
A bending test by V-cut was performed. Further, the decorative sheet was subjected to a blocking test according to a conventional method.
The test results are as shown in Table 1.

[0044]

[Table 1]

As can be seen from the results in Table 1, Example 1,
The decorative sheet prepared in 2 had good workability without cracking in the bending test. In addition, there was no blocking of the decorative sheet and no trouble occurred during handling. On the other hand, in Comparative Example 1 in which an acrylic resin having a small molecular weight of 40,000 was used for the top coat layer, blocking occurred on the decorative sheet, which was a problem in handling. In addition, in order to prevent blocking, In Comparative Example 2 in which an acrylic resin having a high Tg (90 ° C.) was used, cracking occurred in a bending test, resulting in poor workability. Therefore, in the present invention, it was proved that setting the acrylic resin used for the top coat layer to have a Tg of 50 ° C. or less and a weight average molecular weight of 100,000 or more was very effective.

[0046]

As described above, according to the present invention,
As a thermoplastic resin sheet of the decorative sheet, a polyolefin resin sheet such as polyethylene or polypropylene is used, and a printing ink layer and an acrylic resin sheet are sequentially laminated on one side of the polyolefin resin sheet to produce a laminated sheet. After forming an embossed pattern on the surface of the acrylic resin sheet, a glass transition point of 50
By forming a top coat layer using an acrylic resin having a weight average molecular weight of 100,000 or more and a mixed solvent of isopropyl alcohol and ethyl acetate at a temperature of not more than 100 ° C., the V-cut suitability and bending workability can be improved. An excellent and weather-resistant decorative sheet can be obtained. In addition, in order to enhance the design of the decorative sheet, the concave portion of the embossed pattern of the decorative sheet is filled with a coloring ink by a wiping method to prepare a decorative sheet, and the same resin as the top coat layer is used as a binder for the coloring ink. To improve the adhesiveness between the layers to improve the V-cut suitability and the bending workability. Furthermore, since the decorative sheet of the present invention uses a polyolefin resin sheet instead of the polyvinyl chloride sheet, it solves the problem of chlorine and hydrogen chloride generated by the polyvinyl chloride sheet, which was a major problem of the conventional decorative sheet. can do.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view showing another example of the decorative sheet of the present invention.

FIGS. 3A and 3B are explanatory diagrams when a decorative sheet is produced. FIG. 3A is a schematic cross-sectional view of a print sheet in which a solid print layer and a picture print layer are formed on a thermoplastic resin sheet. (B) A schematic cross-sectional view of a laminated sheet obtained by doubling and embossing the printing sheet and the acrylic resin sheet. (C) A schematic cross-sectional view of a decorative sheet in which a topcoat layer is formed on the laminated sheet.

4A and 4B are explanatory diagrams when a decorative sheet according to another embodiment is produced, and FIG. 4A is a schematic cross-sectional view of a print sheet in which a solid print layer and a picture print layer are formed on a thermoplastic resin sheet. (B) A schematic cross-sectional view of a laminated sheet obtained by doubling and embossing the printing sheet and the acrylic resin sheet. (C) A schematic cross-sectional view of the laminated sheet in which the embossed concave portions of the laminated sheet are filled with coloring ink. (D) A schematic cross-sectional view of a decorative sheet in which a topcoat layer is formed on a laminated sheet in which a concave portion of the embossed pattern is filled with a coloring ink.

FIG. 5 is an explanatory view when a decorative sheet is produced according to Example 2, and (a) is a schematic cross-sectional view of a print sheet in which a solid print layer and a picture print layer are formed on a thermoplastic resin sheet. (B) A schematic cross-sectional view of a laminated sheet obtained by doubling and embossing the printing sheet and the acrylic resin sheet. (C) A schematic cross-sectional view of the laminated sheet in which the embossed concave portions of the laminated sheet are filled with coloring ink. (D) A schematic cross-sectional view of a decorative sheet in which a topcoat layer is formed on a laminated sheet in which a concave portion of the embossed pattern is filled with a coloring ink.

[Explanation of symbols]

 Reference Signs List 1 decorative sheet 2 printed sheet 3 laminated sheet 11 thermoplastic resin sheet (film) 12 printed layer 12a picture printed layer 12b solid printed layer 13 acrylic resin sheet 14 top coat layer 15 embossed pattern 15a embossed concave section 16 primer layer 17 coloring ink

Claims (7)

[Claims] 1. A decorative sheet in which an acrylic resin sheet is laminated on the surface of a thermoplastic resin sheet subjected to a decoration treatment, and an embossed pattern and a top coat layer are formed on the surface of the acrylic resin sheet. A transition point of 50 ° C. or less and a weight average molecular weight of 100,000
A decorative sheet comprising the acrylic resin described above. 2. A decorative sheet in which an acrylic resin sheet is laminated on one side of a decorative resin-treated thermoplastic resin sheet, and an embossed pattern and a top coat layer are formed on the surface of the acrylic resin sheet. Having a glass transition point of 50 ° C. or less and a weight average molecular weight of 100,0
A decorative sheet characterized by being formed using a paint composed of an acrylic resin of at least 00 and a mixed solvent of isopropyl alcohol and ethyl acetate. 3. The sheet according to claim 1, wherein the thermoplastic resin sheet is a polyolefin resin.
A decorative sheet according to claim 1. 4. The decorative sheet according to claim 1, wherein a colored ink layer is provided in the concave portion of the embossed pattern by a wiping process. 5. The colored ink layer has a glass transition point of 50.
The decorative sheet according to claim 4, wherein the decorative sheet is made of an acrylic resin having a weight average molecular weight of 100,000 or more at a temperature of not more than 100C. 6. The colored ink layer having a glass transition point of 5
It is formed using an acrylic resin having a weight average molecular weight of 100,000 or more at 0 ° C. or less, a mixed solvent of isopropyl alcohol and ethyl acetate, and a paint composed of a composition containing a colorant as a main component. Claim 4
And the decorative sheet according to claim 5. 7. The decorative sheet according to claim 1, wherein a primer layer is formed on a back surface of the decorative sheet.