JP2009083179A - Manufacturing method of transfer sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a transfer sheet capable of transferring a transfer layer to both of a woody material such as MDF board and resin impregnated paper constituting the edge part thereof with good adhesiveness and capable of manufacturing a decorative sheet having high design properties. <P>SOLUTION: The manufacturing method of the transfer sheet for a woody base board comprises pasting a resin impregnated paper, which is formed by laminating a transfer layer 8 containing at least a peel layer 3, a decorative layer 5 and an adhesive layer 7 on a base material 2, wherein the adhesive layer is formed by applying an ink composition prepared by dissolving a polyamide resin in a solvent based on methylcyclohexane and a 1-4C alcohol and containing no aromatic compound. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a transfer sheet, and more particularly to a method for producing a transfer sheet that can be transferred with good adhesion to a substrate having both a resin-impregnated paper and a woody substrate, and that can produce a decorative board with high design. .

2. Description of the Related Art Conventionally, various transfer products such as decorative plates have been widely manufactured by transferring a transfer layer including a decorative layer to a transfer target substrate using a transfer sheet. In addition, a heat-fusing adhesive is often used for bonding the transfer layer to the substrate to be transferred (see, for example, Patent Document 1).
The adhesive used in the transfer layer is appropriately selected according to the type of transfer object to be transferred. For example, when the material to be transferred is a resin film such as polyethylene, an adhesive mainly composed of urethane resin is used, and woody materials such as MDF (medium density compression plywood) and HDF (high density compression plywood) are used. For this, an adhesive such as a polyamide-based adhesive or a vinyl chloride / vinyl acetate copolymer is suitable.

  By the way, the door material and the like are made of a wood-based material such as an MDF board. However, an attempt has been made to create an R portion in order to improve the design by using resin-impregnated paper at the edge portion. When such a door material is decorated with a transfer foil, the transfer foil is transferred to the resin-impregnated paper portion in addition to the wood-based material portion. However, since the resin-impregnated paper is porous and has a resin component, the adhesive is used when the transfer sheet and the transfer target are bonded, and the resin composition constituting the adhesive layer penetrates into the resin-impregnated paper. In some cases, the resin component of the layer and the resin component of the resin-impregnated paper are not compatible, and sufficient adhesion cannot be obtained. In addition, after transferring the transfer sheet, there is a problem that micro cracks are generated on the surface.

On the other hand, each layer constituting a decorative material such as a transfer sheet is usually prepared by dissolving a resin material in an aromatic solvent such as toluene or xylene and applying and drying it. Due to recent environmental problems, There is a demand for not using these aromatic solvents.
In particular, polyamide adhesives that are suitable for woody materials such as MDF (medium density compressed plywood) and HDF (high density compressed plywood) currently use aromatic solvents. It was requested.

Japanese Patent Publication No. 60-59876

  In view of the above problems, the present invention can transfer with good adhesiveness to any of wood-based materials such as MDF board and resin-impregnated paper constituting the edge portion thereof without using an aromatic solvent, and It aims at providing the manufacturing method of the transfer sheet which can manufacture the decorative board which has high designability.

  As a result of intensive studies to achieve the above object, the inventors of the present invention are methods for producing a transfer sheet in which a transfer layer including at least a release layer, a decoration layer, and an adhesive layer is laminated on a substrate. The present inventors have found that the above-described problems can be solved by using methylcyclohexane and a lower alcohol as main components as a solvent for the ink composition for coating the adhesive layer. The present invention has been completed based on such findings.

That is, the present invention
(1) A method for producing a transfer sheet for a wood-based substrate, in which a resin-impregnated paper in which a transfer layer including at least a release layer, a decoration layer, and an adhesive layer is laminated is pasted on a base material, the adhesive layer Is a transfer sheet characterized in that it is formed by applying an ink composition comprising, as a main component, methylcyclohexane and an alcohol having 1 to 4 carbon atoms and dissolving a polyamide-based resin in a solvent not containing an aromatic compound. Production method,
(2) The method for producing a transfer sheet according to (1), wherein the alcohol has 3 or 4 carbon atoms,
(3) The method for producing a transfer sheet according to (1) or (2), wherein the alcohol has a relative evaporation rate of 30 to 200,
(4) The transfer according to any one of (1) to (3), wherein the content of methylcyclohexane in the ink composition is 25 to 50% by mass and the content of alcohol is 10 to 25% by mass. Sheet manufacturing method,
(5) The method for producing a transfer sheet according to any one of (1) to (4), wherein the ink composition contains an antiblocking agent, and (6) the solid content in the ink composition is The method for producing a transfer sheet according to any one of (1) to (5), which is 35 to 50% by mass,
Is to provide.

  According to the production method of the present invention, since an aromatic solvent is not used, the load on the environment is small, and it can be transferred with good adhesiveness to either a wood-based material or a resin-impregnated paper. The decorative board which has can be manufactured.

The present invention is a method for producing a transfer sheet in which a transfer layer including at least a release layer, a decoration layer, and an adhesive layer is laminated on a substrate, wherein the adhesive layer contains methylcyclohexane and an alcohol having 1 to 4 carbon atoms. It is formed by applying an ink composition in which a polyamide-based resin is dissolved in a solvent that contains a main component and does not contain an aromatic compound.
Hereinafter, the manufacturing method of the transfer sheet of the present invention will be described in detail with reference to FIG.

FIG. 1 is a schematic view showing a cross section of a transfer sheet according to the present invention. A transfer sheet 1 illustrated in FIG. 1 includes a substrate 2 and a transfer layer 8 including a release layer 3, a primer layer 4, a decoration layer 5, an overprint layer 6, and an adhesive layer 7.
The substrate 2 is not particularly limited and may be a conventionally known substrate, as long as it has releasability from the transfer layer 8 and the surface to be transferred has irregularities, as long as it has shape conformability to the irregularities. Accordingly, when the transfer surface is a flat surface or a two-dimensional uneven surface and the transfer sheet is not stretched, a general biaxially stretched polyethylene terephthalate film (sheet) or non-stretchable paper can be used.
In addition, when the transfer sheet is stretched with a three-dimensional uneven surface, it is important to use a stretchable base material at least during transfer. As the stretchable substrate, for example, a thermoplastic resin can be used, and specifically, polypropylene, polyethylene, polymethylpentene, ethylene-propylene-butene terpolymer, olefin-based thermoplastic elastomer, and the like. Examples include olefin resins; thermoplastic polyester resins such as ethylene terephthalate isophthalate copolymer, polyethylene terephthalate, and polybutylene terephthalate; vinyl chloride resins; polyamide resins; elastomers such as urethane-based thermoplastic elastomers.
The substrate 2 may be a single layer of a film or sheet made of the above-described material, or may be used as a laminate made of different materials.
Although it does not specifically limit as thickness of the base material 2, Usually, it is about 20-200 micrometers.

If necessary, the base material 2 may be provided with a release layer on the transfer layer side in order to improve the peelability from the transfer layer (not shown). The release layer is peeled and removed from the transfer layer together with the base material 2 when the base material 2 is peeled off. As the release layer, for example, an acrylic resin, a butyral resin, a vinyl chloride resin, a silicone resin, a melamine resin, a polyamide resin, a urethane resin, a polyolefin resin, a wax, or the like or a mixture containing these is used.
In order to adjust the peelability, the surface of the substrate 2 on the transfer layer side may be subjected to a surface treatment such as a coating treatment, a corona discharge treatment, or an ozone treatment.

Moreover, if a concavo-convex pattern is provided on the surface of the substrate 2 on the side in contact with the transfer layer, a concavo-convex pattern such as grain, satin or wood can be formed on the surface of the transfer layer after transfer. The concavo-convex pattern can be formed by a known method such as embossing, sandblasting, and raised printing processing of a shaping layer (which can also serve as a release layer).
Furthermore, an antistatic layer can be provided on the opposite side of the surface of the substrate 2 that is in contact with the transfer layer for the purpose of preventing the adhesion of dust. As the antistatic layer, an aqueous solution containing a nonionic surfactant and / or a cationic surfactant can be used.

The transfer layer 8 in the transfer sheet according to the present invention contains at least the release layer 3, the decoration layer 5, and the adhesive layer 7, and the primer layer 4 between the release layer 3 and the decoration layer 5 as desired. The overprint layer 6 is provided between the decorative layer 5 and the adhesive layer 7.
The release layer 3 is a layer provided for adjusting the peelability between the base material 2 or the release layer provided on the base material 2 and the decorative layer 5 and for protecting the surface of the decorative layer 5 after transfer. It is.

In the method for producing a transfer sheet in the present invention, first, a release layer 3 is provided on a substrate. The release layer 3 can be laminated by a known method such as gravure printing, roll coating, screen printing, or offset printing. Although it does not specifically limit as thickness of the peeling layer 3, Usually, it is about 1-20 micrometers.
Examples of the release layer 3 include acrylic resins, vinyl chloride resins, urethane resins, vinyl chloride-vinyl acetate copolymers, butyral resins, cellulose resins, etc., or a mixture of two or more thereof, electron beam curable resins, It is preferable to use an ultraviolet curable resin obtained by crosslinking and curing. In this case, an acrylic resin is preferable in consideration of wear and transparency.

  In order to make surface release appear in the release layer 3 after the transfer, it is preferable to add polyethylene wax, Teflon wax, carnauba wax, paraffin wax or the like as an additive. In addition, when used in exterior applications or parts exposed to sunlight, light stabilizers such as benzotriazole, benzophenone, salicylic acid UV absorbers and hindered amine radical scavengers, phenolic antioxidants and heat It is preferable to add a stabilizer or the like.

Next, a primer layer 4 can be provided on the release layer 3, that is, between the release layer 3 and the decorative layer 5, if desired. The primer layer 4 plays a role of protecting the decorative layer and enhancing the adhesion between the release layer and the decorative layer.
Although it does not specifically limit as thickness of the primer layer 4, Usually, it is about 1-10 micrometers.
The primer layer 4 can be laminated by the same method as the release layer 3.

  As the primer layer 4, an amino group-containing acrylic resin is preferably used. In consideration of surface protection of the decorative layer 5 after transfer, a two-pack type silicone amino group-containing acrylic resin using a silicone compound as a curing agent is more preferable.

  The amino group-containing acrylic resin is preferably a tertiary amino group-containing acrylic resin. A tertiary amino group-containing acrylic resin is an acrylic resin having a dialkylamino group in the side chain, and is usually a radical copolymerization of a monomer composition of a tertiary amino group-containing radical polymerizable monomer and another radical polymerizable monomer. Can be obtained by:

  As the tertiary amino group-containing radical polymerizable monomer, 2-dimethylaminoethyl (meth) acrylate, 2-diethylaminoethyl (meth) acrylate, 3-dimethylaminopropyl (meth) acrylate, 3-diethylaminopropyl (meth) (Meth) acrylic acid such as acrylate, N- [2- (meth) acryloyloxyethyl] piperidine, N- [2- (meth) acryloyloxyethyl] pyrrolidine, N- [2- (meth) acryloyloxyethyl] morpholine Ester monomers; aromatic monomers such as 4- (N, N-dimethylamino) styrene, 4- (N, N-diethylamino) styrene, 4-vinylpyridine; N- [2-dimethylaminoethyl] (meth) Acrylamide, N- [3-dimethylaminopropyl] (meth) (Meth) acrylamide monomers such as chloramide; 2-dimethylaminoethyl vinyl ether, 2-diethylaminoethyl vinyl ether, 3-dimethylaminopropyl vinyl ether, 3-diethylaminopropyl vinyl ether, 4-dimethylaminobutyl vinyl ether, 6-dimethylaminohexyl vinyl ether, etc. And vinyl ether monomers.

  Other radical polymerizable monomers that are copolymerized with the tertiary amino group-containing radical polymerizable monomer are not particularly limited, and include carboxylic acid group-containing monomers such as (meth) acrylic acid, maleic acid, and itaconic acid; glycidyl (meta ) Epoxy group-containing monomers such as acrylate; other, methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, styrene, vinyltoluene, Examples thereof include vinyl acetate and α-methylstyrene. In addition, these may be used independently and may use 2 or more types together. Moreover, the polymerization method of the said tertiary amino group containing acrylic resin is not specifically limited, It can carry out by a well-known method.

  The silicone compound used as the curing agent is preferably a compound having one or more epoxy groups or trialkoxysilyl groups in one molecule, and more preferably one epoxy group and trialkoxysilyl group in each molecule. Compounds having the above are preferred. As an example of alkoxy, lower alkoxy groups such as methoxy group, ethoxy group, n-propoxy group, i-propoxy group and the like are preferable.

Next, the decorative layer 5 gives decorativeness to the transfer object, and is formed by printing various patterns on the release layer 3 or the primer layer 4 using ink and a printing machine. The printing method is not particularly limited, and can be performed by a known method such as gravure printing, offset printing, or screen printing. In addition, although it does not specifically limit as thickness of the decoration layer 5, Usually, it is about 1-10 micrometers.
As patterns, there are stone patterns imitating the surface of rocks such as wood grain patterns, marble patterns (for example, travertine marble patterns), fabric patterns imitating cloth or cloth patterns, tiled patterns, brickwork patterns, etc. There are also patterns such as marquetry and patchwork that combine these. These patterns are formed by multicolor printing with the usual yellow, red, blue and black process colors, as well as by multicolor printing with special colors prepared by preparing the individual color plates that make up the pattern. Is done.
The printing may be partial printing or solid printing, and both partial printing and solid printing may be performed. Moreover, the uneven | corrugated pattern by embossing etc. to a peeling layer may be sufficient.

As the ink used for the decorative layer 5, an ink obtained by appropriately mixing a binder, a colorant such as a pigment or a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, or a curing agent is used. The binder is not particularly limited, and examples thereof include polyurethane resins, vinyl chloride / vinyl acetate copolymer resins, vinyl chloride / vinyl acetate / acrylic copolymer resins, chlorinated polypropylene resins, acrylic resins, and polyesters. Arbitrary resins, polyamide resins, butyral resins, polystyrene resins, nitrocellulose resins, cellulose acetate resins and the like may be used alone or in combination of two or more.
Colorants include carbon black (black), iron black, titanium white, antimony white, yellow lead, titanium yellow, petal, ultramarine, cobalt blue and other inorganic pigments, quinacridone red, isoindolinone yellow, phthalocyanine blue, etc. Metal pigments composed of scaly foils such as organic pigments or dyes, aluminum, brass, pearlescent pigments composed of scaly foils such as titanium dioxide-coated mica and basic lead carbonate, and the like are used.

Next, the overprint layer 6 is a layer provided between the decorative layer 5 and the adhesive layer 7 as desired. The overprint layer 6 improves the adhesion between the adhesive layer and the decorative layer, and transfers the transfer sheet. It also has a function as a so-called sealing layer that prevents the resin composition constituting the decoration layer or the like from penetrating into the resin-impregnated paper during the transfer to the transfer target. Since it has such a sealing effect, by providing the overprint layer 6, minute cracks (microcracks) on the decorative board surface to which the transfer sheet is transferred can be suppressed.
The component constituting the overprint layer 6 is not particularly limited as long as it has an effect as a sealing layer. For example, one-component curable urethane resin, two-component curable urethane resin, epoxy resin, acrylic resin, Examples include vinyl acetate resin. As the one-component curable urethane resin and the two-component curable urethane resin, those similar to those used as the transfer adhesive constituting the adhesive layer 7 described in detail later can be used.
As the acrylic resin, an amino group-containing acrylic resin used for the primer layer 4 described above, a two-component silicone / amino group-containing acrylic resin using a silicone compound as a curing agent, and the like are preferably used.
The overprint layer 6 can be laminated by the same method as the release layer 3.

In the transfer sheet of the present invention, the adhesive layer 7 is formed by dissolving a polyamide-based resin in a solvent containing methylcyclohexane (relative evaporation rate; 320) and an alcohol having 1 to 4 carbon atoms and not containing an aromatic compound. An ink composition is applied and formed. By using these solvents, the environmental load is small and sufficient solubility of the polyamide-based resin can be obtained.
The alcohol used here has 1 to 4 carbon atoms. Specifically, methanol (relative evaporation rate; 190), ethanol (relative evaporation rate; 154), n-propanol (relative evaporation rate; 94), Isopropanol (relative evaporation rate; 150), n-butanol (relative evaporation rate; 50), isobutanol (relative evaporation rate; 64), sec-butanol (relative evaporation rate; 115), tert-butanol (relative evaporation rate; 130) Among them, alcohols having 3 or 4 carbon atoms are preferable in terms of solubility.
Of these alcohols, the relative evaporation rate is preferably in the range of 30 to 200, and more preferably in the range of 30 to 170. This is because the relative evaporation rate of methylcyclohexane is 320, and the evaporation rate of the whole solvent can be made appropriate by adding a component having a lower relative evaporation rate. Here, the relative evaporation rate means a relative evaporation rate when the evaporation rate of acetic acid-n-butyl is 100, and the larger the value, the lower the evaporation rate.

  The methylcyclohexane content and the alcohol content in the ink composition are preferably in the range of 25 to 50 mass% and 10 to 25 mass%, respectively. Within this range, the solubility of the polyamide resin, which will be described in detail later, is good, the viscosity of the ink composition when applying the adhesive layer 7 is appropriate, and the coating property is good It is. Also, the drying property is good, and the uniform adhesive layer 7 can be efficiently formed.

Examples of the polyamide resin contained in the ink composition for forming the adhesive layer 7 include those obtained by condensation of polymerized fatty acid and diamines. Specifically, a homopolymer of a polyamide derived from a dicarboxylic acid such as adipic acid, sebacic acid, decanedicarboxylic acid or dimer acid and a diamine such as ethylenediamine, tetramethylenediamine, hexamethylenediamine or metaxylylenediamine. Or a copolymer, a polyamide copolymer derived from a lactam and a dicarboxylic acid and a diamine, polyacrylamide, polymethacrylamide, N, N-bis (hydroxymethyl) suberamide, poly (γ-methylglutamate), poly (γ Amide compounds such as -ethyl glutamate), poly (N-vinyl lactam), and poly (N-vinyl pyrrolidone).
The polyamide resin used in the present invention preferably has a molecular weight of about 10,000 to 20,000.

The polyamide resin used in the present invention is preferably selected from those having adhesiveness (tackiness). By selecting a material having adhesiveness, it becomes easy to design a transfer adhesive that can adhere well to both the wood-based material and the resin-impregnated paper.
However, since this adhesiveness deteriorates the handling of the polyamide-based resin, it is preferable to contain an antiblocking agent in the ink composition for the purpose of preventing this.

The anti-blocking agent is not particularly limited as long as it is usually used for decorative sheets and the like. For example, highly transparent inorganic particles such as silica, alumina, aluminum hydroxide, barium sulfate, talc, calcium carbonate, etc. Are preferably used.
The particle size of the antiblocking agent is usually preferably about 0.1 to 5 μm, more preferably 0.5 to 3 μm from the viewpoint of effects.
As content of an antiblocking agent, it is preferable to contain in 1-20 mass% in the ink composition for forming an adhesive bond layer.

  Further, the solid content in the ink composition in the production method of the present invention is 35 to 50% by mass as a whole, including the polyamide-based resin, the anti-blocking agent, and other additives described below. The range of is preferable. Within this range, the balance with the solvent is good, and steps such as coating and drying can be performed with high productivity, and a transfer sheet having good performance can be produced.

  Various additives can be blended in the transfer adhesive. Examples of the additive include an abrasion resistance improver, an infrared absorber, an antistatic agent, a leveling agent, a thixotropic agent, a filler, a solvent, a colorant, a weather resistance improver, and an antibacterial agent.

Examples of the wear resistance improver include fine particles of inorganic materials such as α-alumina, silica, kaolinite, iron oxide, diamond, and silicon carbide. Examples of the shape of the fine particles include a sphere, an ellipsoid, a polyhedron, a scale shape, and the like. Although there is no particular limitation, a spherical shape is preferable. Organic materials include synthetic resin beads such as cross-linked acrylic resin and polycarbonate resin. The particle size is usually about 30 to 200% of the film thickness. Among these, spherical α-alumina is particularly preferable because it has high hardness and a large effect on improving wear resistance, and it is relatively easy to obtain spherical fine particles.
As the infrared absorber, for example, a dithiol metal complex, a phthalocyanine compound, a diimmonium compound, or the like is used.
As the filler, for example, barium sulfate, talc, clay, calcium carbonate, aluminum hydroxide and the like are used.
Examples of the colorant include known coloring pigments such as quinacridone red, isoindolinone yellow, phthalocyanine blue, phthalocyanine green, titanium oxide, and carbon black.

The adhesive layer 7 is formed by applying the ink composition detailed above. The thickness of the adhesive layer is not particularly limited as long as adhesiveness to the transfer target is obtained, but is usually in the range of 1 to 50 μm. In particular, in consideration of simultaneous adhesion to the wood material and the resin-impregnated paper, the thickness of the adhesive layer 7 is preferably in the range of 5 to 30 μm, and more preferably in the range of 10 to 20 μm.
There is no restriction | limiting in particular about the coating method of the adhesive bond layer 7, Usually, methods, such as gravure printing, a spray coat, a flow coat, can be used.

The transfer sheet according to the present invention can satisfactorily adhere to both the resin-impregnated paper and the wood-based material in the wood-based material to which the resin-impregnated paper is stuck. That is, the transfer sheet according to the present invention is extremely effective for a substrate in which a transfer target has both a resin-impregnated paper and a wooden base material.
Here, the resin-impregnated paper is obtained by impregnating a fibrous base material with resin. Paper is typically used as the fibrous base material, but in addition to this, a nonwoven fabric or a laminate thereof may be used. As the paper, for example, thin paper, kraft paper, high quality paper, linter paper, baryta paper, sulfuric acid paper, Japanese paper and the like are used. Moreover, as a nonwoven fabric, the nonwoven fabric which consists of fibers, such as a polyester resin, an acrylic resin, nylon, vinylon, glass, is used, for example. The basis weight of paper or non-woven fabric is usually about ²⁰ to 100 g / m ² . By adding acrylic resin, styrene butadiene rubber, melamine resin, urethane resin, diallyl phthalate resin (DAP resin), etc. to these fibrous base materials (resin impregnation after paper making or filling during paper making) Resin-impregnated paper. Among these, DAP resin is preferable from the viewpoint of adhesion. The resin impregnation rate {= [(basis weight after impregnation−basis weight before impregnation) / basis weight before impregnation] × 100 [%]} is preferably about 30 to 100% from the viewpoint of bending workability. .
Examples of the wood-based material include wood-based materials such as wood plywood, wood single board, particle board, medium density fiber board (MDF), and high density fiber board (HDF).

An easy-adhesion primer for assisting adhesion with the adhesive layer or a sealer agent that seals and seals the fine irregularities and the porosity of the surface may be applied in advance to the surface of the transfer object. . The easy adhesion primer or sealer is usually formed by coating a resin such as isocyanate, two-component cured urethane resin, epoxy resin, acrylic resin, or vinyl acetate resin.
The shape of the transfer target is not particularly limited, and can be applied to any shape such as a sheet, a film, a flat plate, a curved plate, a rod-like plate, and a three-dimensional object.

When the transfer sheet according to the present invention is transferred to a wood-based material to which resin-impregnated paper is attached, the temperature of heat transfer is about 180 to 200 ° C. More specifically, when the transfer layer 8 is transferred from the transfer sheet 1 to the transfer target, the adhesive constituting the adhesive layer 7 is melted by heating, and the adhesive is cooled and solidified to thereby form the transfer layer 8. The adhesive is adhered to the transfer body (initial adhesion), and then the adhesive is melted at about 180 to 200 ° C. and cured to obtain a final adhesion state.
In addition, the timing which peels the base material 2 is the hardening reaction which the base material 2 cooled to the extent which is not cut | disconnected or plastically deformed by the stress at the time of peeling after cancellation | release of transfer pressure, and the adhesive layer 7 cooled or partially progressed. It may be performed after the time when the transfer sheet 1 is solidified and fixed to the transfer target.

  As the transfer conditions, the heat transfer temperature is as described above, and the transfer speed is preferably in the range of 1 to 10 m / min. When it is 1 m / min or more, high productivity is obtained, and when it is 10 m / min or less, good transfer processability is obtained. From the above viewpoint, the transfer speed is more preferably in the range of 4 to 8 m / min.

  The decorative board using the transfer sheet obtained by the production method of the present invention can be used as a door material, bathroom wall material, unit bath wall material, unit bath interior material, kitchen wall material, AV equipment, air conditioner cover, etc. In particular, as mentioned above, some wood-based materials such as wood plywood, wood veneer, particle board, medium density fiber board (MDF), and high density fiber board (HDF) are processed with resin-impregnated paper. Ideal for door materials.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by this example.
(Evaluation methods)
(1) Viscosity: The viscosity at the time of application of the ink composition for forming the adhesive layer 7 was measured with a Iwata cup at 20 ° C.
(2) Evaluation of decorative board Material with DAP impregnated paper ("FLX-230BK" manufactured by Fuji Polymer Co., Ltd.) pasted around MDF substrate ("Techno Wood" manufactured by Daiken Industry Co., Ltd., thickness 2 mm) Prepared. The decorative sheet obtained in Examples and Reference Examples was transferred to this material under the conditions of a transfer temperature of 200 ° C. and a transfer speed of 7 m / min to produce a decorative board. The following items were evaluated for the decorative board thus produced.

(A) Presence or absence of microcrack About the obtained decorative board, the cycle which heats at 80 degreeC for 2 hours and cools at -20 degreeC for 2 hours is repeated 3 times, digital microscope ("SH-4500" made by HIROX) It was observed at a magnification of 150 times, and the presence or absence of microcracks (microcracks) was confirmed.
○: No microcracks Δ: Some microcracks ×: Microcracks (B) Adhesiveness 18 mm wide cellophane tape (“Cellotape (registered trademark)” manufactured by Nichiban Co., Ltd.) on the peeling layer of the obtained decorative board After being adhered, the film was peeled once in the direction of 45 degrees and evaluated according to the following criteria.
○: No peeling Δ: Some peeling ×: Peeling (C) Blocking property Two sheets of the obtained decorative plates were stacked and stored at 40 ° C. for 3 days under a pressure of 49 kPa (0.5 kg / cm ² ). . Subsequent blocking properties were evaluated according to the following criteria.
○: Good Δ: The transfer sheet is slightly adhered to the PET film, but there is no practical problem.
X: The transfer sheet adheres to the PET film.

Example 1
As the base material 2, PET (“E-130” manufactured by Mitsubishi Polyester Film Co., Ltd., 1000 mm width) is used, and an acrylic resin is used as a binder on one side and a resin composition containing polyester as an additive is applied. A release layer 3 was provided. The thickness of the release layer 3 was 2 μm.
Next, a two-part curable moisture-curing silicone acrylic resin (“SOL AC Resistant” manufactured by Showa Ink Industry Co., Ltd.) formed by blending a tertiary amino group-containing acrylic resin and a silicone-based curing agent on the release layer 3. The primer layer 4 made of The thickness of the primer layer 4 was 2 μm.
On top of this, a woodgrain decorative layer 5 was formed by gravure printing using a colorant mainly composed of acrylocyanate as a binder and phthalocyanine, isoindolinone, and quinacridone as main components. The thickness of the decoration layer 5 was 2 μm.
Next, the overprint layer 6 was provided using the same two-component curable amino group-containing acrylic resin as that used for forming the release layer 3 on the decorative layer 5. The thickness of the overprint layer 6 was 2 μm.
Next, in a mixed solvent composed of 42% by mass of methylcyclohexane (relative evaporation rate; 320) and 18% by mass of isopropanol (relative evaporation rate; 150), 24% by mass of polyamide resin (weight average molecular weight 17,000) and sedimentation An ink composition was obtained by adding 11% by mass of silica as an inhibitor and 5% by mass of calcium carbonate as an anti-blocking agent. The viscosity measured by the above method was 17 seconds.
The ink composition was gravure-coated on the overprint layer 6 to form an adhesive layer 7 so that the thickness after drying was 13 μm. The transfer sheet thus produced was evaluated by the above method. The results are shown in Table 1.

Example 2
In Example 1, a mixed solvent of 40% by mass of methylcyclohexane (relative evaporation rate; 320) and 16% by mass of n-butanol (relative evaporation rate; 50) was used as a solvent, and 9 parts of calcium carbonate as an antiblocking agent was used. A transfer sheet was produced in the same manner as in Example 1 except that the mass% was used. The results of evaluation in the same manner as in Example 1 are shown in Table 1.

Reference example 1
As a solvent, a mixed solvent of toluene (relative evaporation rate; 240) 40% by mass and isopropanol (relative evaporation rate; 150) 15% by mass was used, and a polyamide-based resin (weight average molecular weight 17,000) 24% by mass, A transfer sheet was produced in the same manner as in Example 1 except that 11% by mass of silica as an anti-settling agent and 5% by mass of calcium carbonate as an anti-blocking agent were added to obtain an ink composition. However, when the ink composition was printed on the overprint layer 6, it was diluted by adding 14% by mass of a mixed solvent of toluene and isopropanol (mass ratio 1: 1). The results of evaluation in the same manner as in Example 1 are shown in Table 1.

  As is clear from the evaluation results of Examples 1 and 2 and Reference Example 1, according to the production method of the present invention, it is possible to obtain a coating property comparable to that when using a conventional aromatic solvent, In addition, a transfer sheet having the same performance can be produced. That is, the present invention makes it possible to produce a transfer sheet having the same level of performance as a conventional one using a solvent with a small environmental load.

  According to the transfer sheet of the present invention, it is possible to produce a decorative board that can be transferred with good adhesiveness to both the wood-based material and the resin-impregnated paper and that has high design properties. Therefore, a door in which a part of wood-based material such as wood plywood, wood veneer, particle board, medium density fiber board (MDF), high density fiber board (HDF) is processed with resin impregnated paper such as DAP resin impregnated paper. It can be suitably used for materials and the like, and can be transferred with high adhesiveness to both wood-based materials and resin-impregnated paper.

It is a schematic diagram which shows the cross section of an example of the transfer sheet concerning this invention.

Explanation of symbols

1. Transfer sheet Base material 3. Release layer 4. Primer layer 5. Decorative layer 6. Overprint layer 7. Adhesive layer 8. Transfer layer

Claims (6)

  A method for producing a transfer sheet for a wood-based substrate, wherein a resin-impregnated paper in which a transfer layer including at least a release layer, a decoration layer, and an adhesive layer is laminated is attached to a base material, wherein the adhesive layer is methylcyclohexane And a method for producing a transfer sheet, which is formed by applying an ink composition comprising a polyamide-based resin dissolved in a solvent containing alcohol having 1 to 4 carbon atoms as a main component and not containing an aromatic compound.   The method for producing a transfer sheet according to claim 1, wherein the alcohol has 3 or 4 carbon atoms.   The method for producing a transfer sheet according to claim 1 or 2, wherein the alcohol has a relative evaporation rate of 30 to 200.   The method for producing a transfer sheet according to any one of claims 1 to 3, wherein the content of methylcyclohexane in the ink composition is 25 to 50 mass%, and the content of alcohol is 10 to 25 mass%.   The method for producing a transfer sheet according to claim 1, wherein the ink composition contains an anti-blocking agent.   The method for producing a transfer sheet according to claim 1, wherein the solid content in the ink composition is 35 to 50% by mass.

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