JP2001096706A - Decorative laminated sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative laminated sheet which has outstanding surface properties such as mar-proofness, and inhibited warpage and high adhesive properties with an adhesive and further, is best suited as an alternative for a decorative laminated sheet of a polyvinyl chloride resin. SOLUTION: The decorative laminated sheet 10 comprises (B) a thermoplastic resin layer 2, (C) a primer layer 3, (D) a pictorial pattern layer 4, (E) an adhesive reinforcing layer 5 to be provided if desired, (F) a primer layer 6 and (G) a mar-proof clear resin layer 7 laminated on one of the faces of (A) a base material sheet 1 from the base material sheet 1 side. In addition, the decorative laminated sheet 10 has (B') a thermoplastic resin layer 2', (C') a primer layer 3' and (E') an adhesive reinforcing layer 5' to be provided if desired, laminated sequentially on the other face of the base material sheet 1 from the base material sheet 1 side. Thus the decorative laminated sheet 10 has a structural features as described.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative board, and more particularly, to a decorative board having surface characteristics excellent in scratch resistance, abrasion resistance, stain resistance, etc., curving suppressed, and applied to floors and walls. The present invention relates to a decorative plate which has good adhesion to an adhesive used when the coating is performed and is suitable as a substitute for a vinyl chloride resin-based decorative plate which is a source of environmental pollution, particularly for floor tiles and wall panels.

[0002]

2. Description of the Related Art Conventionally, as decorative panels such as floor tiles and wall panels, those made of wood or vinyl chloride resin have been used because of their moderate flexibility and good workability. . However, the use of wood is inevitably restricted for forest protection. On the other hand, vinyl chloride resin decorative panels have poor durability (resistance to wear, scratches, dents, etc.), poor cleaning properties, and emit harmful chlorine and dioxin when incinerated, which poses a problem in terms of environmental pollution. In addition, the plasticizer contained in it is easy to bleed,
There were also problems such as causing poor appearance. Therefore, there has been a demand for a decorative board which does not use a vinyl chloride resin, has good workability, and has excellent durability and cleaning properties. On the other hand, in recent years, consumers
Floor tiles, wall panels, and the like are also required to have a high-class appearance, and therefore, decorative panels used for them are desired to have a high-grade appearance. By the way, in recent years, ionomer resins obtained by partially or completely neutralizing a copolymer of an α-olefin and an α, β-unsaturated carboxylic acid with a metal ion to form an intermolecular cross-linking have been improved in abrasion resistance and Because of its excellent surface properties such as stain resistance and good environmental pollution, it has attracted attention as a surface layer of decorative boards. Accordingly, various decorative boards having the ionomer resin layer on the surface layer and not using a vinyl chloride resin have been developed. For example, (1) on backer material,
A first resin layer, which has been sequentially printed, a second resin layer made of a copolymer of olefin and methacrylic acid, and a third resin layer made of an ionomer resin, in which a carboxyl group is crosslinked between molecular chains by hydrogen bonding. (Japanese Unexamined Patent Publication No. 8-254004), and (2) a decorative material in which a pattern layer and an adhesive resin layer are sequentially provided on at least one surface of a first resin layer made of an ionomer resin (Japanese Unexamined Patent Publication No. 8-188)
No. 3), (3) an upper layer made of an ionomer resin,
There is disclosed, for example, a decorative material (Japanese Patent Application Laid-Open No. 9-207276) in which a lower layer composed of a backer layer mainly composed of an acrylate copolymer resin is laminated on a back surface thereof via a pattern layer and a primer layer. These cosmetic materials do not use vinyl chloride resin, and because the surface layer is an ionomer resin layer, they have good surface properties such as abrasion resistance, abrasion resistance, and stain resistance. It does not cause environmental pollution caused by chlorine. However, each of these decorative materials has an important problem that warpage is likely to occur during the manufacturing process and during storage of the product because each layer is laminated only on one surface of the backer material. There is also a problem that the adhesiveness between the adhesive and the back surface of the decorative material (the surface opposite to the backing material lamination surface) is insufficient when applying the material to the floor or wall using an adhesive. are doing.

[0003]

SUMMARY OF THE INVENTION Under such circumstances, the present invention has excellent surface properties such as excellent scratch resistance, abrasion resistance, stain resistance, etc. and excellent appearance giving a luxurious feeling. Warpage is suppressed, and it has good adhesion with the adhesive used when installing on floors and walls, and is suitable as a substitute for vinyl chloride resin-based decorative boards that are a source of environmental pollution, especially for floor tiles and wall panels The purpose of the present invention is to provide a simple decorative board.

[0004]

The inventor of the present invention has conducted intensive studies to develop a decorative board having the above-mentioned preferable properties. As a result, the base sheet (backer material) is formed of specific layers on both sides. By providing the multi-layer laminated sheet, in particular, a certain portion of the laminated sheet provided on both sides of the base sheet, by substantially symmetric about the base sheet,
They have found that the object can be achieved, and have completed the present invention based on this finding. That is, the present invention
(1) (A) one side of a base sheet, (B) a thermoplastic resin layer, (C) a primer layer, (D)
A picture layer, (F) a primer layer and (G) a scratch-resistant clear resin layer are sequentially laminated, and on the other surface of the base sheet, (B ′) a thermoplastic resin layer and ( C ′) a decorative plate having a structure in which primer layers are sequentially laminated, (2) the (B) layer and the (B ′) layer, and the (C) layer and the (C ′) layer are substantially each 2. The decorative board according to claim 1, wherein the decorative board has the same substance and the same layer thickness, (3) an adhesive reinforcement layer is provided between the (D) layer and the (F) layer, and the (C ′) layer is provided on the (C ′) layer. (E ′) The decorative plate according to item 1 or 2 provided with an adhesion reinforcing layer, (4) (E) the resin constituting the adhesion reinforcing layer is the same as the resin component in the (D) picture layer. 4. The decorative plate according to claim 3, wherein (5) (A) a portion extending over the layers (B) to (E) laminated on one surface of the base sheet and the other surface of the base sheet. Is the layer (B ') ~
(6) The decorative plate according to (3) or (4), wherein the portion extending over the (E ′) layer is substantially symmetric about the base sheet.
The layer (E) and the layer (E ′) are made of substantially the same substance, and the total layer thickness of the layer (D) and the layer (E) is substantially the same as the layer thickness of the layer (E ′). 7. The decorative panel according to any one of items 1 to 6, wherein the decorative sheet according to item 3, 4, or 5 and (7) (A) the base sheet uses a polyolefin resin as a resin component. Item 8. The decorative plate according to any one of Items 1 to 7, wherein the (8) (G) scratch-resistant clear resin layer is an ionomer resin film.
(9) The decorative panel according to any one of (1) to (8) used for floor tiles, and (10) any one of (1) to (8) used for wall panels The decorative board described above is provided.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The decorative board of the present invention is composed of a multilayer laminate, and the base sheet (backer material) of the layer (A) is non-halogen, and is used as a base material of the decorative board. Any polymer may be used as long as it can be used, and there is no particular limitation, and a resin using a polyolefin resin as a resin component can be preferably exemplified. The polyolefin resin is not particularly limited, and may be, for example, a homopolymer of α-olefin such as ethylene, propylene, butene-1, 3-methylbutene-1, 3-methylpentene-1, and 4-methylpentene-1; These copolymers, or copolymers of these with other copolymerizable unsaturated monomers, and the like can be mentioned. Representative examples include high-density, medium-density, low-density polyethylene, linear low-density polyethylene, ultra-high-molecular-weight polyethylene, ethylene-vinyl acetate copolymer, polyethylene such as ethylene-ethyl acrylate copolymer, and propylene alone. Examples include polypropylenes such as polymers, propylene-ethylene block copolymers and random copolymers, and propylene-ethylene-diene compound copolymers, polybutene-1, and poly-4-methylpentene-1. Among the above polypropylenes, crystalline polypropylene resins are often used. Examples of the crystalline polypropylene resins include isotactic propylene homopolymer having crystallinity and ethylene-propylene having a low ethylene unit content. A random copolymer, a propylene block copolymer composed of a homo part composed of a propylene homopolymer and a copolymer part composed of an ethylene-propylene random copolymer having a relatively high content of ethylene units, and the propylene block copolymer. A crystalline propylene-ethylene-α-olefin copolymer or the like in which each homo part or copolymer part in the block copolymer is further obtained by copolymerizing an α-olefin such as butene-1 is exemplified.

[0006] The polyolefin resin may be used alone or in combination of two or more.
Recycled products can also be used, but it is preferable to select and use them appropriately according to the use of the decorative board. For example, when a decorative board is used as a floor tile, it is preferable that the base sheet has appropriate elasticity. Therefore, low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-propylene copolymer (EPR), Ethylene-butene copolymer (EBM), a mixture thereof, or a mixture thereof with a crystalline polypropylene resin is preferable.
Further, when the decorative panel is used as a wall panel or as a decorative panel on a surface of a cabinet of furniture or a kitchen product, since a base sheet needs to have appropriate rigidity, a crystalline polypropylene resin is preferable. is there. The base sheet preferably contains an inorganic filler at a ratio of 20 to 85% by weight, particularly preferably 30 to 75% by weight. If the content is less than 20% by weight, the cutting properties and rigidity are insufficient, and 85% by weight.
Exceeding the range is not preferred because the sheet formability and impact resistance are reduced and the weight is increased. Here, examples of the inorganic filler include calcium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, kaolin, silica, perlite, calcium sulfate, barium sulfate, calcined alumina, calcium silicate, talc, mica, and the like. These may be used alone or in combination of two or more. Among these inorganic fillers, calcium carbonate,
Talc, aluminum hydroxide and magnesium hydroxide are preferred, and calcium carbonate is particularly preferred. There is no particular limitation on the calcium carbonate, such as precipitated calcium carbonate, heavy calcium carbonate, light calcium carbonate, etc.
Either can be used. The average particle size of the calcium carbonate is usually 0.05 to 200 μm, preferably 0.5.
２０20 μm.

[0007] If necessary, the base sheet may contain various additional components such as antioxidants, heat stabilizers, ultraviolet absorbers, light stabilizers, chlorine scavengers, flame retardants, flame retardant assistants, lubricants, mold release. Agents, coloring agents, plasticizers, softeners such as process oils and liquid paraffin, and other thermoplastic resins and thermoplastic elastomers. In order to prepare the base sheet of the layer (A), first, the above-mentioned polyolefin-based resin and preferably an inorganic filler such as calcium carbonate of 20 to 85% by weight based on the total amount of the molding material are used, if necessary. A polyolefin-based molding material is prepared by blending with various additive components and mixing with a tumbler blender or Henschel mixer, or by melt-kneading and granulating using a single-screw extruder or a multi-screw extruder after mixing. I do. Then, the polyolefin-based molding material, a known method, for example, cast molding,
It is molded by a method such as extrusion sheet molding to produce a base sheet. The polyolefin-based molding material may be foamed in an extruder to produce a foamed base sheet having an appropriate expansion ratio. The thickness of the base sheet is generally selected in the range of 0.08 to 10.0 mm, preferably 0.1 to 6.0 mm, depending on the use of the decorative board. For example, when a decorative board is used as a floor tile, the thickness of the base sheet is
Preferably it is 1.5-6.0 mm, more preferably 2.5-5.0 mm.
0 mm, and when used as a wall panel, the thickness of the base sheet is preferably 1.0 to 10.0 mm, more preferably 2.5 to 6.0 mm. In the decorative board of the present invention, (B) a thermoplastic resin layer is provided on one surface of the base sheet thus obtained from the base sheet side,
(C) a primer layer, (D) a picture layer, (F) a primer layer, and (G) a scratch-resistant clear resin layer are sequentially laminated.

The thermoplastic resin layer, which is the layer (B), has a function of suppressing the warpage of the decorative plate, while imparting a hiding power for providing high designability to the picture layer provided thereon. I have. For this thermoplastic resin layer, a polyolefin-based resin that can be thermally fused to the base sheet is preferably used. In addition, calcium carbonate,
5 Inorganic fillers such as magnesium sulfate and titanium oxide
What contains about 30 weight% is preferable. The thickness of the layer (B) is usually about 50 to 150 μm.
As such a thermoplastic resin layer, for example, a polyolefin-based synthetic paper formed by mixing calcium carbonate and titanium oxide with polypropylene or polyethylene and the like can be used. If the thermoplastic resin layer of the layer (B) and the base sheet are not sufficiently heat-sealing, for example, if polyethylene synthetic paper is used, if necessary,
It is preferable that the adhesive layer is interposed between the base sheet and the layer (B), and the layer (B) is laminated. At this time, as the adhesive layer, a film of the same quality as the base sheet or a material showing tackiness when heated, for example, chlorinated polyolefin resin, polyurethane resin, epoxy resin, acrylic resin, vinyl resin, vinyl acetate About 1 to 20 μm made of a known adhesive mainly composed of a base resin, a polyester resin, an ethylene-vinyl acetate copolymer resin, an acryl-vinyl acetate copolymer resin, a polyamide resin, an ionomer resin, etc. Can be preferably cited. When a film of the same quality as the base sheet is used as the adhesive layer, the film is previously bonded to the back surface of the laminate material for forming the layer (B) with an adhesive such as urethane or acrylic. Advantageously, this allows the laminate to be thermally fused to the substrate sheet.

The primer layer of the layer (C) laminated on the layer (B) is provided for improving the adhesion between the layer (B) and the picture layer, and the primer layer The type of is not particularly limited as long as it has an adhesive force that can be practically used as a decorative board, but, for example, ethylene-vinyl acetate copolymer resin or olefin-based resin or a mixture thereof, chlorinated polyolefin resin , A polyurethane resin, a maleic acid-modified polypropylene resin or the like dissolved in a solvent, or a coating liquid obtained by finely pulverizing these resins and emulsifying them by adding a surfactant or the like. The primer layer of the layer (C) may be formed by coating a coating solution containing the above resin at a solid content of about 5 to 50% by weight by a known means such as gravure coating, roll coating, air knife coating, bar coating, and dip coating. , (B) layer and dried. The thickness of the layer (C) is usually about 1 to 5 μm. The pattern layer of the layer (D) may be formed on the layer (C) or may be formed on the layer (F) described later. In the present invention, the pattern layer is formed on the layer (C). It is advantageously formed. This pattern layer is a layer expressing wood grain, stone grain (marble pattern, granite pattern), natural leather surface pattern, cloth grain, abstract pattern, etc., gravure printing, screen printing, offset printing, letterpress printing, transfer printing, flexographic printing The thickness of the ink forming the pattern layer is usually 1
About 30 μm. Examples of the resin component of the printing ink include polyester isocyanate, polyether isocyanate, linear polyester, acrylic resin, polyurethane, cellulose derivative, and the like.
These may be used alone or in combination of two or more.

The primer layer (F) is used for improving the adhesion between the pattern layer (D) and the abrasion-resistant clear resin layer (G) described later. The type and formation method of the primer are as described in the primer layer of the layer (C). The primer layer of the (F) layer is advantageously formed on the back surface of the laminate used for the abrasion-resistant clear resin layer, which is the (G) layer described below. The thickness of the (F) layer is usually 1
About 5 μm. Next, the scratch-resistant clear resin layer of the layer (G) may be a transparent laminate material having scratch resistance and is not particularly limited, and various materials can be used. Examples of such a laminate material include an ionomer resin film, an acrylic resin film,
Polyethylene terephthalate films, various polyamide films, vinylon films, and various films having an ultraviolet-curable resin layer provided on the surface thereof are exemplified. Of these, ionomer resin films are particularly preferable. An ionomer resin is generally a resin in which organic and inorganic components are bound by covalent and ionic bonds. As the ionomer resin particularly preferably used in the present invention, a resin in which the intermolecular molecules of the copolymer are cross-linked with metal ions is mentioned. As the copolymer in this case, an acrylate-based copolymer such as ethylene-methacrylic acid copolymer is used. Polymers. Examples of the metal ions include ions of Na, K, Mg, Zn and the like. In order to obtain an ionomer resin, for example, an ethylene-based polymer obtained by copolymerizing a monomer such as acrylic acid having a carboxyl group in a side chain, a hydroxide such as Na, K, Mg, Zn, an alcoholate, a lower A method of neutralizing an acid group by adding a fatty acid salt or the like may be used. As a result, a structure in which carboxyl anions distributed along the molecular chain are electrostatically bonded to metal cations existing between the molecules to form a kind of cross-link, and cross-links between the molecules of the copolymer with metal ions. Is obtained.

By adding a suitable additive to the ionomer resin and forming a film by a known molding method,
An ionomer resin film can be produced. The thickness of this film is usually in the range of 50 to 1000 μm. Further, the ionomer resin film may be a multilayer film. When this ionomer resin film is used as the (G) layer, the back surface may be subjected to corona discharge treatment as required in order to strengthen the adhesion of the (F) layer provided on the back surface to the primer layer. Is advantageous. The surface of the layer (G) can be subjected to embossing if desired. Further, by adding an antistatic agent to the (G) layer, for example, when a decorative panel is used as a floor tile, generation of static electricity due to friction can be prevented. Examples of the antistatic agent include a cationic surfactant, an amphoteric surfactant, an anionic surfactant, a nonionic surfactant, and an organic tin compound. In the present invention, (E) an adhesion-enhancing layer can be provided between the (F) primer layer and (D) picture layer, if desired, for the purpose of further improving the adhesion. As the resin constituting the (E) layer,
Various types can be used, but in the present invention, the same resin component as the printing ink used for forming the picture layer is preferable from the viewpoint of adhesion. The (E) layer is formed, for example, by a gravure coat, a roll coat, an air knife coat, a bar coat, a dip coat, or a printing method using various printing machines containing a coating solution containing the above resin in a solid concentration of about 5 to 50% by weight. It can be formed by coating on the layer (F) and drying by known means such as. The thickness of this (E) layer is usually 1
About 30 μm.

On the other hand, in the decorative board of the present invention, (A)
The thermoplastic resin layer (B ′) and the primer layer (C ′) are sequentially laminated on the surface (back surface of the base sheet) on the opposite side of the base sheet of the layer from the base sheet side. The laminated sheet provided on the back surface of the base sheet has an effect of preventing the decorative board from warping during the manufacturing process or during storage, and uses the adhesive on the floor or wall surface of the decorative board. It has an effect of improving the adhesiveness between the adhesive and the decorative board during construction. In the present invention, in order to effectively suppress the occurrence of warpage during the production process or storage of the decorative board, the thermoplastic resin layer of the above-mentioned (B ′) layer is preferably formed of the above-mentioned (B) layer. The same material and the same layer thickness as the thermoplastic resin layer of (C ′), and the primer layer of the (C ′) layer is
It is desirable that the material and the layer thickness are substantially the same as those of the primer layer (C) described above. In the present invention, when a decorative board is applied to the floor or wall surface with an adhesive on the primer layer of the above-mentioned (C ′) layer, for the purpose of further improving the adhesion between the adhesive and the decorative board. , If desired
(E ') An adhesion reinforcing layer can be provided. in this case,
As described above, (E) an adhesion reinforcing layer is provided between the (D) picture layer and the (F) primer layer, and (A) (B) to (E) laminated on one surface of the base sheet. The parts across the layers,
It is important that the portion (B ′) to (E ′) laminated on the other surface (the back surface of the base material sheet) of the base material sheet is substantially symmetric about the base material sheet. . Therefore, the adhesion reinforcing layer of the layer (E ') is substantially the same substance as the adhesion reinforcing layer of the layer (E), and the thickness of the layer (E') is the same as that of the layer (D). It is desirable that the total layer thickness of the pattern layer and the (E) layer is substantially the same.

Further, as described above, when an adhesive layer is provided between the base material sheet of the layer (A) and the thermoplastic resin layer of the layer (B), if necessary, the layer (A) It is important to provide an adhesive layer having substantially the same substance and the same thickness as the above-mentioned adhesive layer also between the base material sheet and the thermoplastic resin layer of (B ′). In the decorative panel of the present invention having such a configuration, since the primer layer of the (C ′) layer or the adhesion reinforcing layer of the (E ′) layer is provided on the back surface, the decorative panel may be used as a floor surface or a wall surface. When using an adhesive on the object to be applied, the adhesiveness between the adhesive and the decorative board is particularly excellent, and the decorative board can be firmly fixed. FIG.
FIG. 1 is a cross-sectional view of one example of a decorative board of the present invention. As shown in FIG. 1, a decorative board 10 of the present invention has a thermoplastic resin layer 2 and a primer layer on one surface of a base sheet 1. 3, a picture layer 4, an adhesion reinforcing layer 5, a primer layer 6, and a scratch-resistant clear resin layer 7 are sequentially laminated, and on the other surface of the base sheet 1, a thermoplastic resin layer 2 'and a primer layer 3' And an adhesion reinforcing layer 5 ′ are sequentially laminated. The method for producing the decorative board of the present invention is not particularly limited, and any method can be used as long as the method described above can be obtained. The decorative panel of the present invention can be used as a building material such as a floor tile or a wall panel, or as a decorative panel or the like for furniture or a kitchen product cabinet, and is particularly suitable for floor tiles and wall panels. It is.

[0014]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Example 1 (1) Production of base sheet Homopolypropylene [weight average molecular weight of about 320,000, MI
3.1 g / 10 min] 45 parts by weight, 55 parts by weight of calcium carbonate powder having an average particle diameter of 1.0 μm, and 0.2 parts by weight of a hindered phenolic antioxidant are dry-blended and then melted by a twin-screw kneader. A base sheet having a thickness of 3.0 mm was produced by kneading and extrusion sheet molding. (2) Preparation of Laminated Sheet [1] A back surface of an ionomer resin film having a thickness of 250 μm was subjected to a corona discharge treatment, and a primer mainly composed of a polyurethane resin was applied to the treated surface by a gravure coating method.
Coating was performed so that the dry thickness became 2 μm, and a primer layer was provided. Next, on the primer layer, a mixture of a polyurethane-based vehicle and a curing agent isocyanate is coated by a gravure coating method so as to have a dry thickness of 4.0 μm, and an adhesion-enhancing layer is provided. [1] was produced.

(3) Preparation of Laminated Sheet [2] One side of synthetic paper having a thickness of 100 μm formed by blending calcium carbonate and titanium oxide with high-density polyethylene,
A primer containing a polyurethane resin as a main component was coated by a gravure coating method so as to have a dry thickness of 2 μm to provide a primer layer. Next, a marble pattern was printed on the primer layer by a gravure rotary press using a plurality of inks of different colors to provide a picture layer having a thickness of 6 μm. Furthermore, on the surface opposite to the laminated surface of the synthetic paper,
A laminated sheet [2] was produced by providing a 3 μm thick adhesive layer made of a chlorinated polypropylene resin. (4) Production of laminated sheet [3] The laminated sheet [1] obtained in the above (2) and the laminated sheet [2] obtained in the above (3) are respectively made to face the adhesion reinforcing layer and the picture layer. Then, they were bonded by a heat fusion method to produce a laminated sheet [3]. (5) Production of laminated sheet [4] One side of synthetic paper having a thickness of 100 μm formed by blending calcium carbonate and titanium oxide with high-density polyethylene,
A primer containing a polyurethane resin as a main component was coated by a gravure coating method so as to have a dry thickness of 2 μm to provide a primer layer. Next, on the primer layer, a mixture of a polyurethane vehicle and a curing agent isocyanate was coated by a gravure coating method so as to have a dry thickness of 10 μm to provide an adhesion reinforcing layer. Furthermore, on the surface opposite to the laminated surface of the synthetic paper,
A laminated sheet [4] was produced by providing a 3 μm-thick adhesive layer made of a chlorinated polypropylene resin.

(6) Preparation of floor tile material The laminated sheet [3] obtained in the above (4) is placed on one side of the base sheet obtained in the above (1), and the above-mentioned (5) is placed on the other side. By laminating the laminated sheet [4] obtained in the above by heat fusion by a press method at a temperature of 150 ° C. so that the adhesive layer made of chlorinated polypropylene resin is in contact with the base sheet, respectively. A floor tile material having a structure shown in FIG. 1 (however, chlorinated polypropylene resin layers provided on both sides of the base sheet 1 are not shown) was produced. The warpage of the floor tile material and the adhesion to the adhesive were evaluated as follows. <Evaluation of Warpage> A sample having a length of 100 cm and a width of 100 cm was cut out, placed on a flat glass plate, and the height of a square corner and a total of eight intermediate points were measured. . <Evaluation of Adhesiveness with Adhesive> A flexible board having a thickness of 3.0 mm is coated with a urethane-based adhesive, a predetermined comb is inserted, and a floor tile cut into a width of 50 mm is pressed on the flexible board with a roller. Four days later, the 90 ° peel strength was measured. As a result, the maximum warpage is 2 mm, and the adhesive strength is 8.0 kg / 50 m.
m.

Comparative Example 1 A floor tile material was produced in the same manner as in Example 1 except that the laminated sheet [3] was laminated on only one side of the base material sheet by a heat fusion method. And the adhesiveness with the adhesive was evaluated. As a result, the maximum warpage was 5 mm, and the adhesive strength was 0.5 kg / 50 mm. Example 2 (1) Production of base sheet Homopolypropylene (weight average molecular weight: about 320,000, MI
3.1 g / 10 min) 45 parts by weight, 55 parts by weight of calcium carbonate powder having an average particle size of 1.0 μm and 0.2 parts by weight of a hindered phenolic antioxidant are dry-blended,
The mixture was melt-kneaded with a twin-screw kneader to obtain pellets. Then
Using the pellets, a substrate sheet having a thickness of 3.0 mm was formed by extrusion molding. Hereinafter, in the same manner as in Example 1,
A wall panel material was prepared, the warpage was evaluated in the same manner as in Example 1, and the adhesion to the adhesive was evaluated as described below. As a result, the warpage is up to 2 mm and 19 kg /
Cohesive failure of the adhesive occurred at cm ² . <Evaluation of Adhesiveness with Adhesive> A sample of 20 mm × 20 mm size was cut out, the back surface of the sample was adhered to a steel plate using a urethane-based adhesive, allowed to stand for 7 days, and then subjected to a plane tensile test. Was.

[0018]

The decorative board of the present invention has excellent surface properties such as scratch resistance, abrasion resistance, and stain resistance, suppresses warpage, and is used for bonding to floors and walls. In addition to having good adhesion to the agent, it is suitably used as a substitute for a vinyl chloride resin-based decorative board, which is a source of environmental pollution, particularly for floor tiles and wall panels.

[Brief description of the drawings]

FIG. 1 is a sectional view of one example of a decorative board of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base sheet 2 Thermoplastic resin layer 2 'Thermoplastic resin layer 3 Primer layer 3' Primer layer 4 Picture layer 5 Adhesion reinforcement layer 5 'Adhesion reinforcement layer 6 Primer layer 7 Scratch-resistant clear resin layer 10 Decorative plate of the present invention

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 2E110 AA27 AA47 AA65 AB04 AB05 BA05 BA12 GA03Z GA32W GA32Z GB42W GB43Z 4F100 AA08 AA21 AK01B AK01E AK03A AK05 AK07 AK07G AK51 AK51G AK62A AK66A00 A00 BA00 BA07A00 BA07A00 DG10 EC03 EH17 EH46 EJ55 EJ65C GB08 HB00 HB31 HB35D JB16B JK06 JK09 JK14 JK14E JL00 JL04 JL06 JL11E

Claims (10)

[Claims] (A) a thermoplastic resin layer, (C) a primer layer,
(D) a picture layer, (F) a primer layer and (G) a scratch-resistant clear resin layer are sequentially laminated, and (B ′) a thermoplastic resin is formed on the other surface of the base sheet from the base sheet side. A decorative plate having a structure in which a layer and a (C ′) primer layer are sequentially laminated. 2. The decorative board according to claim 1, wherein the layer (B) and the layer (B ′) and the layer (C) and the layer (C ′) have substantially the same material and the same layer thickness. 3. The method according to claim 1, wherein an (E) adhesion reinforcing layer is provided between the (D) layer and the (F) layer, and the (E ′) adhesion reinforcing layer is provided on the (C ′) layer. 2. The decorative board according to 2. (E) the resin constituting the adhesion reinforcing layer is:
The decorative plate according to claim 3, wherein (D) the same as the resin component in the picture layer. 5. A portion (A) covering the layers (B) to (E) laminated on one surface of the substrate sheet, and (B ′) to (E) laminated on the other surface of the substrate sheet. The decorative board according to claim 3 or 4, wherein the portion extending over ') the layer is substantially symmetric about the base sheet. 6. The layer (E) and the layer (E ′) are made of substantially the same substance, and the total layer thickness of the layer (D) and the layer (E) is:
6. The decorative board according to claim 3, wherein the thickness of the layer (E ') is substantially the same. 7. A method according to claim 1, wherein (A) the base sheet uses a polyolefin resin as a resin component.
The decorative board according to any one of the above. 8. The decorative plate according to claim 1, wherein (G) the abrasion-resistant clear resin layer is an ionomer resin film. 9. The method according to claim 1, which is used for floor tiles.
The decorative board according to any one of the above. 10. The decorative board according to claim 1, which is used for a wall panel.