JP2000043196A - Wooden decorative panel and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the warpage of a door or the like using a wooden decorative panel by a temp. and humidity change and to easily produce the wooden decorative panel. SOLUTION: A mooden decorative panel D is constituted by forming a molten moistureproof resin layer 1 to at least the rear surface of a wooden panel B by coating and bonding a decorative sheet S to the upper surface thereof. The moistureproof resin layer may contain a moistureproof agent. This decorative panel is produced by forming the moistureproof resin layer 1 to at least the rear surface of the wooden panel B in a molten state by coating and bonding the decorative sheet S to the upper surface of the wooden panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wooden decorative board used for building materials such as doors and other fittings by attaching a decorative sheet to a base material of a wooden board such as MDF (medium density fiberboard). In particular,
The present invention relates to a wood-based decorative board prevented from warping due to moisture and a method for producing the same.

[0002]

2. Description of the Related Art At present, wooden doors are often used as doors of housing openings. This type of door is generally made of a wood-based material such as plywood or parallel plywood as a frame material and a plastic or paper-based decorative sheet bonded to a wood board such as MDF or plywood as a face material. In many cases, a plate is used to perform a small makeup process or the like to finish it as an interior door or the like. By the way, the wood board has a property that the water content changes according to the change of temperature and humidity. Therefore, even an interior door needs to be resistant to changes in indoor temperature and indoor humidity. The same applies to exterior doors. If the resistance is insufficient, the water content of the base wood board changes, and the dimensional shrinkage of the wood board used as the front and back surfaces of the door causes significant "warping" of the entire door.
Or "twisting" or a great deviation from the door frame material. As a result, the door cannot be opened or closed,
There is a problem that a gap is generated between the door frame and the door. In the case where the wood board used for the face material is plywood, it has a configuration in which veneers are stacked vertically and horizontally, so that it is easy to maintain resistance to warpage or the like against room temperature and humidity differences. However, wood board is especially MD
In the case of F, due to its manufacturing method, it does not have resistance to room temperature and humidity difference,
% Of water content was changed, and warpage or the like was likely to occur.

[0003] Conventionally, as a wood-based decorative board for applications requiring the above-described resistance, a board subjected to moisture-proof / water-proof processing is used. For example, a wood-based decorative board in which a plastic-based decorative sheet is attached to the front side of a wooden board made of MDF or the like, and a plastic film is attached as a moisture-proof layer to the back side. Alternatively, a plastic-based decorative sheet is adhered to the front side of a wooden board made of MDF or the like in the same manner as described above, and a paper / plastic film / paper (a plastic film whose front and back are covered with paper) is provided on the back side as a moisture-proof layer. ), And a wood-based decorative board having a structure in which a laminate of metal foil / paper is bonded thereto (see reference numeral 4 in the wood-based decorative board Da in FIG. 3). In addition, the paper is stuck on the front and back of the plastic film or metal foil to be stuck on the back side because the porosity of the paper makes it easy to adhere the plastic film etc. to the wood board, and at the same time, the obtained wood-based makeup This is to make the board easy to adhere to other objects. For example, JP-A-7
In JP-A-251407, a moisture-proof paper having a structure in which a moisture-proof sheet made of a plastic film, a metal foil, or the like is used as a core layer and paper is laminated on the front and back sides of at least one surface of the substrate is used as an interior material having moisture resistance. It discloses a configuration in which the adhesive is impregnated in the inner paper layer.

[0004]

As described above, in order to prevent the door from warping or twisting when a wooden decorative panel is used as a surface material for a door or the like, a plastic film or the like is conventionally formed by any method and construction. Thus, a moisture-proof layer has been provided, for example, by sticking to the back side of a wooden board or the like. However, as described above, since a single plastic film is difficult to adhere to a wooden board, it is necessary to take a troublesome ingenuity such as sticking it as a laminated body in which paper is also laminated, which is troublesome in manufacturing.

Accordingly, an object of the present invention is to provide a wood-based decorative board which can prevent warpage and twisting of a door when used as a face material of a door, and a method of easily manufacturing the wood-based decorative board. It is to do.

[0006]

Therefore, in order to solve the above-mentioned problems, in the wood-based decorative board of the present invention, a moisture-coated moisture-proof resin layer is formed on at least the back side of the wood board, and the front side of the wood board is provided. Has a configuration in which a decorative sheet is stuck.
As a result, the moisture-proof resin layer ensures the moisture-proof property of the wooden board as the base material, and prevents the door or the like from warping when the wooden decorative board is used as a door face material or the like. For example, a hot melt adhesive can be used for the moisture-proof resin layer. In addition, the wood-based decorative board of the present invention may be configured such that the moisture-proof resin layer further contains a moisture-proofing agent. As a result, while the moisture-proof resin layer improves the moisture-proof property due to the presence of the moisture-proof agent, as the resin component constituting the moisture-proof resin layer, a resin having a slightly lower moisture-proof property but an excellent adhesive property can be used. A moisture-proof resin layer having both excellent moisture-proof properties can be obtained.

It is to be noted that, in addition to the above configuration, a paper may be attached with the moisture-proof resin layer on the back side as an adhesive layer. This makes it easy to bond the wooden decorative board to another object such as a frame material on the back surface. Further, a configuration may be employed in which a decorative sheet is attached using the moisture-proof resin layer formed on the front side as an adhesive layer. In this case,
In particular, when the decorative sheet is a paper-based decorative sheet and its moisture-proof property is poor, the moisture-proof property on the front side can also be improved.

Next, in the method for producing a wooden decorative board of the present invention, a moisture-proof resin layer is formed on at least the back side of the wooden board by melt coating, and a decorative sheet is attached to the front side of the wooden board. . As a result, such as the wood-based decorative board of the present invention,
A wood-based decorative board is obtained in which a moisture-proof resin layer that has been melt-coated is formed on at least the back side of the wood board, and a decorative sheet is attached to the front side of the wood board. By adopting such a manufacturing method, the moisture-proof resin layer has better adhesion to the wooden board and decorative sheet as compared with the conventional method of attaching a plastic film as the moisture-proof resin layer to obtain a warp-preventive wooden decorative board. And it can be easily formed. The moisture-proof resin layer to be melt-coated may be a layer containing a moisture-proof agent.

In addition to the above method, paper may be adhered using the moisture-proof resin layer on the back side as an adhesive layer. Since the paper can be adhered when the moisture-proof resin layer is melted or the like, the paper can be adhered to the wooden board with good adhesion, and the need to separately apply an adhesive can be saved. Also,
A decorative sheet may be adhered using the moisture-proof resin layer formed on the front side as an adhesive layer. Since the decorative sheet can be adhered when the moisture-proof resin layer is melted or the like, the decorative sheet can be adhered to the wooden board with good adhesion, and the trouble of separately applying an adhesive can be omitted.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a wooden decorative board of the present invention and a method for producing the same will be described below with reference to the drawings.

[Outline] First, in the cross-sectional view of FIG. 1, several examples of various forms of the wooden decorative board of the present invention are illustrated. In the wooden decorative board D shown in FIG. 1 (A), a moisture-proof resin layer 1 that has been melt-coated is formed only on the back side of the wooden board B, and on the front side of the wooden board B, a decorative sheet S is provided with an adhesive. This is a configuration in which the layers are adhered via the layer 2. Moreover, the wood-based decorative board D shown in FIG. 1B has a configuration in which the paper 3 is further adhered to the configuration of FIG. 1A using the moisture-proof resin layer 1 on the back side as an adhesive layer. .

Further, a wood-based decorative board D of the form shown in FIG. 1 (C) is different from the structure of FIG. 1 (A) in that an adhesive layer 2 for attaching a decorative sheet S is a moisture-proof resin layer 1. In which the moisture-proof resin layer 1 that has been melt-coated is formed on both the front and back sides of the wooden board B. The wood-based decorative board D shown in FIG. 1D has a configuration in which the paper 3 is further adhered to the configuration of FIG. 1C using the moisture-proof resin layer 1 on the back side as an adhesive layer. . In addition, in the configuration of FIG. 1 (A) to FIG.
The moisture-proof resin layer 1 may contain a moisture-proof agent as needed. For the moisture-proof resin layer formed by the above-described melt coating, for example, a hot melt adhesive made of an ethylene-vinyl acetate copolymer or the like is used. In addition, as the desiccant, wax having excellent moisture resistance is used.

As described above, in the wooden decorative board of the present invention,
Since the moisture-proof resin layer is formed by melt coating, the adhesion of the moisture-proof resin layer is superior to that of a conventional structure in which a plastic film requiring a special bonding method is adhered. Therefore, on the back side, furthermore, a configuration in which paper is stuck to the moisture-proof resin layer as an adhesive layer,
On the front side, a configuration in which the decorative sheet is adhered using the moisture-proof resin layer as an adhesive layer is also possible. Since a separate adhesive layer can be omitted, a wood-based decorative board can have a simple configuration and excellent moisture resistance. As a result, the wooden board of the base material is protected from moisture absorption and release due to changes in temperature and humidity, and when the wooden decorative board is used as a face material of a door or the like, warpage or twisting is prevented.

FIG. 2 is a cross-sectional view showing one example of use of such a wooden decorative board D. The wooden decorative board D is used as a face material, and the back of the wooden decorative board D is made of wood, etc. The state which fixed to the core material 5 with the adhesive agent 6 is shown. Of course, nails or the like may be used for fixing, but when the wooden decorative board D is fixed on the back surface with the adhesive 6, the paper 3 is placed on the back side as shown in FIGS. 1B and 1D described above. The bonded configuration is preferred. Incidentally, the wood-based decorative board D illustrated in FIG. 2 corresponds to the wood-based decorative board D in FIG. The paper on the back surface facilitates adhesion to other objects such as the frame member 5.

The decorative sheets to be used are roughly divided into
There are a plastic decorative sheet whose sheet base is a plastic sheet and a paper decorative sheet whose base sheet is paper. In particular, a plastic decorative sheet is superior in moisture resistance as compared with a paper decorative sheet, so that the decorative sheet itself can be used as a moisture-proof layer. For this reason, when a plastic-based decorative sheet is stuck, the moisture-proof resin layer formed by melt-coating on the front side may be omitted [in FIG. 1 (A) and FIG. 1 (B), the decorative sheet S Is a plastic decorative sheet].

Incidentally, needless to say, even in the case of a plastic-based decorative sheet, similarly to the case of a paper-based decorative sheet, a configuration in which the moisture-proof resin layer is formed on the front side may be adopted. In this case, a decorative adhesive layer may be further provided on the moisture-proof resin layer, and the decorative sheet may be adhered. However, since the layer structure and the production are complicated, the moisture-proof resin layer is preferably bonded. It is preferable to apply a decorative sheet as the agent layer [FIG. 1 (C)].
And (D) when the decorative sheet S is a plastic decorative sheet]. The moisture-proof resin layer also serves as an adhesive layer. In the present invention, since the moisture-proof resin layer is formed by melt coating, the moisture-proof resin layer is used as a hot-melt adhesive, so that the decorative sheet can be easily adhered and adhered to not only a paper-based but also a plastic-based one. It is. In the conventional configuration in which a plastic film is adhered as the moisture-proof layer on the front side, it is difficult to attach the decorative sheet using the moisture-proof (resin) layer also as the adhesive layer. As described above, the moisture-proof property of the plastic decorative sheet and the moisture-proof property of the moisture-proof resin layer ensure more excellent moisture-proof property. However, if the decorative sheet itself has already secured sufficient moisture-proof properties with a plastic decorative sheet, etc., it will be over-performance,
The moisture-proof resin layer on the front side may be omitted. However, even when such a moisture-proof resin layer that is melt-coated on the front side is not formed, the present invention uses a hot-melt adhesive for the adhesive layer for attaching a decorative sheet. It does not exclude that the agent layer is formed by melt coating.

Further, in the case of a paper-based decorative sheet, the decorative sheet itself is generally inferior in moisture-proof properties to a plastic-based decorative sheet. Therefore, a configuration in which a moisture-proof resin layer is also provided on the front side is preferable (FIGS. 1C and 1C). D) When the decorative sheet S is a plastic decorative sheet].

In the method for producing a wooden decorative panel of the present invention for producing the wooden decorative panel of the present invention as described above, the moisture-proof resin layer is formed by melt coating, but the coating target is a substrate. However, the present invention is not limited only to the wooden board. A form in which the object to be coated can be other than a wooden board is a case where the moisture-proof resin layer is not exposed and becomes an intermediate layer. That is, when the moisture-proof resin layer 1 is the outermost layer on the back side, as in the case of the wood-based decorative board D illustrated in FIG. 1A, the moisture-proof resin layer 1 is usually melt-coated on the wooden board B. However, for example, as shown in a wooden decorative board D illustrated in FIG.
In a mode in which the paper 3 is further adhered to the surface of the moisture-proof resin layer 1 (on the back side), the moisture-proof resin layer 1 is melt-coated on the wooden board B,
After the moisture-proof resin layer 1 is melt-coated, the paper 3 may be attached to the wooden board B, or the moisture-proof resin layer 1 may be melt-coated on the paper 3 and the moisture-proof resin layer 1 may be melt-coated. The paper 3 may be pasted on the wooden board B. Alternatively, both the wood board B and the paper 3 may be melt-coated, and the melt-coated wood board B and the paper 3 may be bonded together. The same applies to the attachment of the decorative sheet on the front side.

In these cases, when the wood board (or paper) after the moisture-proof resin layer is melt-coated and the paper (or wood board) are stuck, the melt-coated moisture-proof resin layer is adhered. The resin layer may be cooled to a solid state and then reheated to return to a molten state for bonding, but preferably the initial molten state is maintained because the heat during the first melt coating is not sufficiently cooled. It is desirable to do it while leaning, both in terms of thermal energy and production efficiency. In the case of reheating, the moisture-proof resin layer also serving as the front adhesive layer may be provided in advance as a melt-coated adhesive layer on the back side of the decorative sheet to be attached. The decorative sheet is handled in a form having the adhesive layer as a constituent element, such as storage and transportation. The adhesive layer of the decorative sheet serves as the target melt-coated moisture-proof resin layer in the wooden decorative board.

[Wood Board] The wood board B is not particularly limited as long as it is a board made of wood. Wood species, for example,
Cedar, pine, cypress, oak, lauan, teak, melapy, etc.
The form is a veneer, a plywood, a medium density fiberboard (MDF), a particle board, a laminated wood, and the like. In particular, in the present invention, a medium-density fiberboard (MDF) or the like which is likely to be warped is suitable in terms of the effect of the moisture-proof resin layer.

[Moisture-proof resin layer] The moisture-proof resin layer 1 is a layer for preventing moisture and moisture from entering and exiting a wooden board as a base material.
This moisture-proof resin layer is a resin layer formed by melt coating as described above in the present invention. The moisture-proof resin layer may be formed of a material having moisture-proof properties and adhesiveness to a wooden board or the like, and having suitability for melt coating. As a material of such a moisture-proof resin layer, for example, a known hot melt adhesive can be used.
For example, ethylene-vinyl acetate copolymer, butyral resin, polyethylene, polyolefin-based resin such as ethylene-ethyl acrylate copolymer, for example, polyamide resin such as dimer acid and ethylenediamine, and thermoplastic resin such as polyester resin. . In addition, during the melt coating, the resin exhibits thermoplasticity, and thereafter, a curable resin or the like in which a curing reaction proceeds by heat or the like can be used. In addition, known additives such as a rosin-based resin and other tackifiers and antioxidants are appropriately added to these resins to improve physical properties such as melt coating suitability and adhesiveness.

It is preferable that the moisture-proof resin layer contains a moisture-proof agent as needed, in order to improve the moisture-proof property. By including a moisture-proofing agent, a resin having a slightly poor moisture-proofing property but a good adhesiveness can be easily used as a resin component to be used. Therefore, a moisture-proof resin layer excellent in both adhesive and moisture-proof properties can be easily obtained. As the desiccant, wax can be preferably used. As wax, petroleum wax such as paraffin wax, animal wax such as beeswax, vegetable wax such as carnauba wax,
Mineral waxes such as montan wax, synthetic waxes such as Fischer-Tropsch wax, polyethylene wax, and the like. Among them, polyethylene wax, paraffin wax, and the like are preferable waxes in terms of the moisture-proof effect. One or more waxes are used. The content of the wax depends on the resin component to be contained.
About 40 parts by weight.

In the case where the moisture-proof resin layer is provided in advance as an adhesive layer on the back side of the decorative sheet, when the decorative sheet is wound up and stored, it is known to prevent blocking. An anti-blocking agent may be contained. As the anti-blocking agent, for example, extenders such as silica and calcium carbonate are used.

[Melt-coating of moisture-proof resin layer] The method of melt-coating the moisture-proof resin layer may be a method known as a method for melt-coating a hot melt adhesive or the like. For example, it may be applied by various hot melt applicators, roll coaters, sprays, gravure coaters, or the like. The thickness of the moisture-proof resin layer is usually about 10 to 100 μm,
Preferably, it is formed in the range of 20 to 80 μm. If the thickness is too thin, the moisture-proof property is reduced, and if it is too thick, the performance is excessive and the cost increases. In the case of forming the moisture-proof resin layer on the front and back, the order of formation (before and after or simultaneously) is arbitrary. In the present invention, since the formation of the moisture-proof resin layer is formed by melt coating among the coating methods as described above, it is applied by coating a solution (or dispersion) dissolved (or dispersed) in a solvent such as an organic solvent or water. As compared with the case of forming, the step of volatilizing the solvent by drying or the like can be omitted, and the production becomes easier. Moreover, with wood-based decorative boards,
Since a wooden board that easily absorbs an organic solvent, water, or the like is used as a base material, a melt coating method that does not use such an absorbable solvent at all is preferable.

[Attaching Method of Decorative Sheet and Paper] In the present invention,
In order to stick the decorative sheet on the front side or the paper on the back side, it is preferable to use a moisture-proof resin layer formed by the above-mentioned melt coating as an adhesive layer, and press a roller or the like with the moisture-proof resin layer interposed therebetween. And a known laminating method such as a method of laminating by pressing. In this case, as described above, the moisture-proof resin layer serving as the adhesive layer is applied and adhered to the wooden board side, the decorative sheet or the paper side, or both. As the pressure roller, a metal roller having a rigid pressure surface or a rubber roller having a pressure surface made of an elastic material such as silicone rubber is used. The pressure roller is usually used as a heating roller heated by a heating means such as radiant heating by an internal electric heater or an external heater so that the moisture-proof resin layer is laminated in a molten state.

[Adhesive Layer] In order to attach the decorative sheet to the wooden board, it is preferable to use the moisture-proof resin layer also as the adhesive layer so that the decorative sheet is used. In the case where the necessary moisture-proof property is already secured by itself, the adhesive layer for attaching the decorative sheet may be an adhesive layer 2 having a composition different from that of the moisture-proof resin layer [FIGS. B)). The adhesive layer 2 in this case is basically not particularly limited. Conventionally known adhesives may be appropriately selected and formed according to materials such as decorative sheets and wooden boards, required physical properties, and the like. For example, such adhesives include acrylic resins, ethylene-vinyl acetate copolymers, vinyl chloride-vinyl acetate copolymers, vinyl acetate resins, polyamide resins, thermoplastic resins such as thermoplastic urethane resins,
Alternatively, a curable resin such as a urethane resin may be used.
The adhesive may be applied to the wooden board in the form of a solution, a dispersion, a melt, or the like. The coating may be performed by a conventionally known method such as roll coating or spray coating. In this case, the method of attaching the decorative sheet may be a known laminating method such as a pressure roller.

[Cosmetic sheet] The decorative sheet to be used includes:
They are roughly classified into paper-based decorative sheets and plastic-based decorative sheets. The former is a decorative sheet in which the base sheet is made of paper, and the latter is a decorative sheet in which the base sheet is made of plastic. Of course, other materials such as a metal foil may be a decorative sheet of the base sheet. As a decorative sheet used in this way,
There is no particular limitation, and conventionally known various decorative sheets may be appropriately used. Note that the decorative sheet is a sheet on which a base sheet has been subjected to decoration processing. The decoration processing includes applying a decoration layer to a base sheet by printing or the like for expressing a pattern or the like. The decorative layer may be on the front side of the decorative sheet, as the inner intermediate layer, or on the back side of the plastic decorative sheet. In the case of plastic decorative sheets, coloring by adding a pigment to a base material sheet made of plastic, and embossing of the surface or the like to form an uneven pattern are also available.
Further, for the uneven pattern on the outermost surface, there is a so-called wiping process or the like in which the concave portion is filled with a coloring ink.

As the base sheet of the paper decorative sheet, for example, paper such as thin paper, high quality paper, kraft paper, and Japanese paper is used.

As the base sheet of the plastic decorative sheet, for example, a resin sheet (film) such as a polyester resin such as polyethylene terephthalate, a polyolefin resin, a vinyl chloride resin, a polycarbonate, a polystyrene, an ABS resin, and an acrylic resin is used. . The thickness of the base sheet is usually about 20 to 200 μm. Among these, a polyolefin resin sheet is preferable as a sheet which does not generate hydrochloric acid gas during waste combustion and is environmentally preferable.

Examples of the polyolefin resin include highly crystalline non-elastomeric polyolefins such as polyethylene (low density or high density), polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer and propylene-butene copolymer. Resin or various olefinic thermoplastic elastomers are used. As the olefin-based thermoplastic elastomer, for example, the following can be used.

As described in JP-B-6-23278,
(A) As a soft segment, the number average molecular weight Mn is 2
An atactic polypropylene soluble in boiling heptane having a weight average molecular weight Mw of not less than 5,000 and a ratio of weight average molecular weight Mw to number average molecular weight Mn of 7 to 10 to 90% by weight;
As a hard segment, the melt index is 0.1
Soft polypropylene consisting of a mixture of ４4 g / 10 min boiling heptane-insoluble isotactic polypropylene 90-10 wt%.

A thermoplastic elastomer comprising an ethylene-propylene-butene copolymer resin. Here, as the butene, 1-butene, 2-butene and isobutylene are used.
Any of the structural isomers can be used. Preferred specific examples of the ethylene-propylene-butene copolymer, which is a random copolymer and partially includes an amorphous portion, include the following (i) to (iii). (i) Those described in JP-A-9-111055. It is a random copolymer of a terpolymer of ethylene, propylene and butene. The weight ratio of the monomer components is 90% by weight or more of propylene. The melt flow rate is preferably 1 to 50 g / 10 minutes at 230 ° C. and 2.16 kg. And, for 100 parts by weight of such a ternary random copolymer, 0.01 to 50 parts by weight of a transparent nucleating agent containing a phosphate aryl ester compound as a main component,
It is obtained by melting and kneading 0.003 to 0.3 parts by weight of a fatty acid amide having 12 to 22 carbon atoms. (ii) Those described in JP-A-5-77371. this is,
80 to 0% by weight of crystalline polypropylene is added to 20 to 100% by weight of an amorphous polymer having a propylene content of 50% by weight or more, which is a terpolymer of ethylene, propylene and 1-butene. It is. (iii) Those described in JP-A-7-316358. This is a terpolymer of ethylene, propylene, and 1-butene, and the content of propylene and / or 1-butene is 50% by weight or more and 20 to 100% by weight of the low crystalline polymer. 0.5% by weight of an oil gelling agent such as N-acylamino acid amine salt or N-acylamino acid ester is added to a composition containing 80 to 0% by weight of a crystalline polyolefin such as isotactic polypropylene. It becomes.

The ethylene-propylene-butene copolymer resin may be used alone, or may be used in the above (i) to (iii).
If necessary, another polyolefin-based resin may be mixed and used.

As described in JP-B-53-21021, (A) an olefin polymer (crystalline polymer) such as polyethylene, polypropylene or polymethylpentene is used as a hard segment, and (B) a partially crosslinked ethylene- Propylene copolymer rubber, unsaturated ethylene-propylene-
An olefin-based elastomer obtained by using a monoolefin copolymer rubber such as a non-conjugated diene terpolymer rubber as a soft segment, and uniformly mixing and mixing these. Incidentally, monoolefin rubber / olefin polymer = 50/50 to 90
/ 10 (weight ratio).

As described in JP-B-53-34210 and the like, (B) uncrosslinked monoolefin copolymer rubber (soft segment) and (A) olefin copolymer (crystalline, hard segment) are crosslinked. An olefin-based elastomer obtained by mixing with an agent, heating and applying shear stress to dynamically partially cross-link. (B) Monoolefin rubber / (A)
Olefin copolymer = 60/40 to 80/20 (weight ratio).

As described in JP-B-56-15741 and the like, (A) mixing with a peroxide such as isotactic polypropylene, propylene-ethylene copolymer or propylene-butene-1 copolymer and heating reduces the molecular weight. Mixing and heating with a peroxide-decomposable olefin polymer (hard segment) that increases fluidity and (B) a peroxide such as ethylene-propylene copolymer rubber, ethylene-propylene-non-conjugated diene terpolymer rubber, etc. Mixes with peroxides such as peroxide-crosslinked monoolefin copolymer rubber (soft segment), which crosslinks and reduces fluidity, (C) polyisobutylene, butyl rubber, etc.
Peroxide non-crosslinked hydrocarbon rubber (soft segment and fluidity-modifying component) that does not crosslink even when heated and does not change fluidity, and (D) mineral oils such as paraffinic, naphthenic, and aromatic An olefin-based elastomer obtained by mixing a softener and dynamically heat-treating the mixture in the presence of an organic peroxide. (A) is 90 to 40 parts by weight, (B) is 10 to 60 parts by weight.
(A) + (B) = 100 parts by weight,
(C) and / or (D) have a compounding ratio of 5 to 100 parts by weight.

An olefin-based thermoplastic elastomer comprising an ethylene-styrene-butylene copolymer as described in JP-A-2-139232.

The above olefinic thermoplastic elastomer having a hydroxyl group and / or a carboxyl group as a polar group. For example, an olefin-based thermoplastic elastomer having a hydroxyl group introduced by graft polymerization of an ethylene-vinyl alcohol copolymer or the like and a carboxyl group introduced by a copolymer of maleic acid, fumaric acid, itaconic acid or the like is used. Either of these hydroxyl groups and carboxyl groups,
Or, both may be used in combination, and these polar groups have an effect of improving the adhesiveness to another layer such as a decorative layer.

The above polyolefin resin can be formed into a sheet (film) by a film forming method such as a calender method, an inflation method, a T-die extrusion method and the like.

The resin sheet such as the polyolefin resin sheet may be used as a stretched sheet or an unstretched sheet. If necessary, the sheet may contain a filler,
Various additives such as a foaming agent, a flame retardant, a lubricant, an antioxidant, an ultraviolet absorber, and a light stabilizer are added.

For example, the decorative layer is an ink layer on which a pattern or the like is printed by a conventionally known method or material such as gravure printing or transfer printing, or a metal thin film layer formed on a part or the whole surface by vacuum deposition of a metal such as aluminum. And so on. The pattern of the decoration layer is, for example, a wood pattern, a stone pattern, a cloth pattern, a leather pattern, a geometric figure, a character, or the like. In particular, in the case of a paper-based decorative sheet, an overcoat layer may be formed by coating after application. The overcoat layer is used for improving the surface properties such as abrasion resistance, imparting a design feeling such as a coating feeling, and improving the moisture resistance. As the overcoat layer, an acrylic resin, a thermoplastic resin such as a urethane resin, a thermosetting resin, or the like is used, and an extender pigment, a coloring agent, a lubricant, a lubricant, an ultraviolet absorber, etc. are added thereto as needed. Paint is used.

[Paper to be Attached to the Back Side] The paper 3 to be attached to the back side is for facilitating the adhesion of the wooden decorative board to another object using an adhesive on the back side. The paper 3 improves the adhesiveness by the adhesive entering between the fibers. Therefore, paper 3
As the non-coated paper, the surface is not coated. For example, thin paper, high-quality paper, kraft paper, Japanese paper, building material paper, and the like. Further, it is preferable to use paper having a strong inter-sheet strength so that the decorative panel is not peeled off at the portion of the paper 3 after bonding the decorative panel to another object. For example, a sheet-to-sheet reinforced paper such as a building material sheet with an increased sheet-to-sheet strength, impregnated paper, or the like is preferable. It is preferable that the moisture-proof resin layer penetrates into the inside of the paper 3 to a certain degree in view of the adhesiveness between the paper and the moisture-proof resin layer. Is wasted and is not preferred. This is because, in the portion where the composite layer of the paper and the moisture-proof resin layer is formed, the moisture-proof resin layer itself that has entered the inside of the paper has moisture-proof properties, but the moisture easily passes through the paper fibers.

[Use of Wooden Decorative Board] The use of the wooden decorative board is not particularly limited. For example, it is a surface material of a door such as the door described above. In addition, for example, fittings such as sills and lintels, interior materials of buildings such as walls, ceilings, floors, etc., exterior materials such as gates, furniture such as chests of drawers, and weak electric / OA equipment such as television receivers.
Surface decoration materials for equipment cabinets, vehicle interior materials for automobiles, trains, aircraft, ships, etc.

[0044]

EXAMPLES The present invention will be described more specifically with reference to the following examples.

Example 1 A wood-based decorative board D having the structure shown in FIG. 1B was manufactured as follows. As wooden board B,
A 2.7 mm thick MDF plate was prepared. Then, as the moisture-proof resin layer (cumulative adhesive layer) 1, a hot-melt adhesive obtained by adding a polyethylene wax as a moisture-proof agent to an ethylene-vinyl acetate copolymer was used.
/ M ² ) was melt-coated at 35 g / m ² by a roll coating method of coating with a heating roll. Then, with the coated surface facing the wooden board side, the paper is heated and melted again by a heat laminator, which is laminated by a heat roller, with the coated surface facing the wooden board side, and the paper is bonded to the wooden board by heat fusion. I wore it. The condition of the heat laminator is a laminating speed of 40 m /
The temperature of the heat roller (laminate roller) was 120 ° C., and five metal rollers were continuously used as the heat roller.

Next, a hot melt adhesive made of an ethylene-vinyl acetate copolymer was melt-coated at 30 g / m ² by a roll coating method on the surface of the above-mentioned wooden board opposite to the surface to which the paper was adhered, and bonded. At the same time when the agent layer 2 is formed, a plastic decorative sheet S is stuck with a heat roller to form a wooden decorative board D.
I got The decorative sheet is a colored base sheet having a thickness of 80 μm obtained by adding a coloring pigment to a polypropylene-based thermoplastic elastomer, and a wood-grain pattern decoration with a coloring ink using a two-component curable urethane resin as a binder resin. The layer is formed by gravure printing, and the surface on the decoration layer side is made of a polypropylene-based thermoplastic elastomer and has a thickness of 80 μm.
The transparent topsheet was laminated by melt extrusion coating.

A door was prepared using the obtained wooden decorative panel for each of the front and back surfaces, and a resistance test was performed on the door against changes in temperature and humidity. As a result, no warpage was found on the door. It was good. The resistance test conditions were as follows: room A maintained at 5 ° C. and 70% humidity;
%, And a door was set between the room B and the room temperature, and the condition was left for 24 hours.

Example 2 A wood-based decorative board D having the structure shown in FIG. 1D was manufactured as follows. As wooden board B,
A 2.7 mm thick MDF plate was prepared. Then, as the moisture-proof resin layer (also serving as an adhesive layer) 1, a hot-melt adhesive obtained by adding a polyethylene wax as a moisture-proof agent to an ethylene-vinyl acetate copolymer is used.
/ M ² ) to a paper 3 of 50 g / m ² by a roll coating method.
m ^{2 was} melt coated. Then, with the coated side of the paper facing the wooden board side, the heat-resistant laminator using a heat roller heats the moisture-proof resin layer applied on the paper again and melts it. Affixed. The conditions of the heat laminator were as follows: lamination speed 20 m / min, heat roller temperature 120
One rubber roller having an iron core coated with silicone rubber was used as a heat roller at a temperature of ° C.

Next, on the decorative sheet S, a decorative layer having a grain pattern is formed by gravure printing on a sheet-reinforced paper (basis weight: 45 g / m ² ) as a base sheet, and furthermore, 2 A paper-based decorative sheet having a surface coat layer formed by gravure coating a liquid-curable urethane resin-based coating liquid was prepared. And
On a paper surface on the back side of the decorative sheet, a hot-melt adhesive obtained by adding a wax as a moisture-proof agent to an ethylene-vinyl acetate copolymer as a moisture-proof resin layer (adhesive layer) 1 was applied at 35 g / m 3 by a roll coating method. ⁽²⁾ At the same time as the melt coating, the paper was pasted on the front side of the wood board to which the paper had been pasted by a heat laminator to obtain a wood-based decorative board D. The conditions of the heat laminator were as follows: lamination speed 20 m / min, heat roller temperature 1
At 20 ° C., one rubber roller having an iron core coated with silicone rubber was used as a heat roller. A door was prepared from the obtained wooden decorative panel in the same manner as in Example 1 and a resistance test was carried out. As a result, no warping of the door was observed and the door was good.

Example 3 A wood-based decorative board having the structure shown in FIG. 1D was manufactured as follows. The same material as that of Example 2 was used as the material of the wood board B and each of the moisture-proof resin layers (adhesive layer) 1 on the front and back. The decorative sheet S is the same plastic decorative sheet as that used in the first embodiment, and the paper 3 is also used in the first embodiment.
The same thing as was used.

First, the moisture-proof resin layer 1 and the paper 3 were laminated on the back side of the wooden board D in the same manner as in Example 1. Next, on the back side of the plastic decorative sheet S used in Example 1, a hot-melt containing ethylene-vinyl acetate copolymer containing polyethylene wax as a moisture-proofing agent to become a moisture-proof resin layer (also as an adhesive layer) 1. The adhesive was melt-coated at 35 g / m ² by a roll coating method, and at the same time, the decorative sheet was adhered to the front side of the wooden board by a heat laminator. The conditions of the heat laminator were a laminating speed of 20 m / min, a heat roller temperature of 120 ° C., and one rubber roller having an iron core coated with silicone rubber was used as the heat roller. A door was prepared from the obtained wooden decorative panel in the same manner as in Example 1 and a resistance test was carried out. As a result, no warping of the door was observed and the door was good.

Comparative Example A wood-based decorative board Da having the structure shown in FIG. 3 was manufactured as follows. The same wooden board D and decorative sheet S as in Example 1 were used. First, as the moisture-proof laminate 4 on the back side, a thickness of 120 μm made of polypropylene
Weight 45g / on both sides of plastic film 4a
A sheet was prepared by adhering an inter-sheet reinforcement paper 4b of m ² with a urethane resin-based adhesive. Then, a vinyl acetate resin-based aqueous emulsion adhesive was applied to the surface on the back side of the wooden board D, and the above-mentioned moisture-proof laminate was adhered by pressing with a roller. Next, an adhesive of a urethane resin-based organic solvent solution was applied to the front side of the wooden board and dried, and the decorative sheet was pressed with a heating roller, and the adhesive was bonded by heat fusion.
Then, the volatile components of the adhesive are dried, and the wooden decorative board D
a was obtained. The decorative sheet S of the wooden decorative board Da is adhered to the front side of the wooden board B with a vinyl acetate resin-based adhesive layer 2,
On the back side, a three-layer moisture-proof laminate 4 of paper / plastic film / paper is adhered with a urethane resin-based adhesive layer 2.

A door was made from the obtained wooden decorative board in the same manner as in Example 1 and a durability test was carried out. As a result, no warpage was observed on the door, and the door was good. Since the body has a three-layer structure, it takes a lot of time to manufacture it, and the sticking of the moisture-proof laminate and the decorative sheet also requires a complicated process of applying a special adhesive and further drying.

[0054]

According to the wood decorative board of the present invention, the moisture-proof resin layer formed by melt coating can prevent the absorption and release of moisture to the wood board of the base material. Therefore, even if the wood-based decorative board is used, for example, as a door facing material, it is possible to prevent the door from warping or twisting. The moisture-proof resin layer may be at least only on the back side, but if it is also formed on the front side, the decorative sheet is made of, for example, paper,
Even when the decorative sheet itself has poor moisture resistance, it is possible to reliably prevent moisture from being absorbed and released into the wooden board. In addition, since the moisture-proof resin layer is a layer formed by melt coating, a heat-sealing effect by heating and cooling the layer can be used, and the layer is also used as an adhesive layer to form a layer of a wooden decorative board. The configuration can be simplified. For example, an adhesive layer for a decorative sheet to be attached to the front side of a wooden board can be formed, and it is possible to omit separately providing an exclusive adhesive layer for attaching the decorative sheet. This is the same even when the paper is stuck on the back side.

When a moisture-proofing agent is contained in the moisture-proofing resin layer, a resin having a slightly poor moisture-proofing property but a good adhesiveness can be used as a resin component used in the moisture-proofing resin layer. Therefore, a moisture-proof resin layer excellent in both adhesive and moisture-proof properties can be easily obtained.

In the method for producing a woody decorative board according to the present invention,
The wooden decorative board as described above can be easily manufactured. That is, since the moisture-proof resin layer is formed by melt coating, compared to the case of forming by solution coating of a solution (or dispersion) dissolved (or dispersed) in a solvent such as an organic solvent or water,
The step of evaporating the solvent by drying or the like can be omitted, and the production becomes easy. In addition, a solvent such as an organic solvent or water is not essentially absorbed by the wooden board, and a drying step of drying the solvent in the moisture-proof resin layer or the solvent further absorbed by the wooden board can be omitted. The moisture-proof resin layer to be melt-coated is
It can also be used as an adhesive layer to be heat-sealed, so it can be used as an adhesive for a decorative sheet to be adhered to the front side, or as an adhesive for paper to be appropriately adhered to the back side if necessary. There is no need to apply adhesive. As a result of these,
The method for producing a wood-based decorative board of the present invention is a production method with extremely high productivity.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a form example of a wood-based decorative board of the present invention.

FIG. 2 is a cross-sectional view showing an example of use of the wood-based decorative board of the present invention.

FIG. 3 is a cross-sectional view showing an example of a conventional wooden decorative board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Moisture-proof resin layer 2 Adhesive layer 3 Paper 4 Moisture-proof laminated body 4a Plastic film 4b Paper 5 Core material 6 Adhesive B Woody board D Woody decorative board Da Conventional woody decorative board S Decorative sheet

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2E110 AA27 AB12 BA04 BA05 BA12 BB03 EA09 GA03X GA03Z GA32W GA32X GA32Z GA33Z GB42W GB43X GB43Z GB45X GB45Z GB47X GB47Z GB52X GB52Z GB62Z GB63W GB63X 4F100 AJ11AK03B00AJ11AK03A00 BA10A BA10D CA30A CA30C CB03 DG10 EH462 EJ422 GB08 HB00D JD04A JD04C JD15 JL04

Claims (3)

[Claims] 1. A wood-based decorative board comprising a melt-coated moisture-proof resin layer formed on at least the back side of a wood board, and a decorative sheet adhered to the front side of the wood board. 2. The wood-based decorative board according to claim 1, wherein the moisture-proof resin layer contains a moisture-proof agent. 3. A method for producing a wood-based decorative board, wherein a moisture-proof resin layer is formed on at least the back side of a wooden board by melt coating, and a decorative sheet is attached to the front side of the wooden board.