JP2001150884A - Transfer method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of defects such as the breakage of a transfer sheet and the heavier manner rotation generated by the contact of an emboss roller with a base to be transferred. SOLUTION: In a transfer method, a bonding agent layer 3 composed of a resin of thermoplasticity is formed on a transfer layer side or/and the side of a face to be transferred or the side of face to be transferred of the base to be transferred of a transfer sheet S formed of a substrate sheet 1 and the transfer layer 2, and an emboss roller 5 is pressed from the substrate sheet side of the transfer sheet to pressure bond the transfer sheet on the base to be transferred and simultaneously apply the emboss thereon and then the substrate sheet is released, and the total thickness T of the bonding agent layer and that of the transfer sheet is more than the difference H between maximum high and maximum low of the recesses and projections of the emboss roller. The emboss roller can be used in the heated state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer method for performing transfer and embossing using a transfer sheet on a substrate to be transferred, using an adhesive of a resin exhibiting thermoplasticity such as a hot melt type.

[0002]

2. Description of the Related Art Conventionally, the surface of a substrate to be transferred, such as a wood-based substrate, is coated with a transfer layer by transfer, and the surface is embossed to form an uneven pattern to form a decorative material or the like. Manufacture of transfer products has been performed.

For example, Japanese Patent Application Laid-Open No. H11-198590 discloses a transfer method in which embossing is performed by a transfer device (lapping device) in one form of a so-called lapping transfer method. That is, a hot-melt type adhesive is applied to the transfer sheet, and the transfer sheet is pressed against the base material by an embossing roller also serving as a pressing roller (transfer roller), and at the same time, the embossing is performed from above the transfer sheet. Then, the support sheet of the transfer sheet is peeled off, and a concavo-convex pattern is formed by embossing simultaneously with the transfer.

[0004]

However, according to the transfer method disclosed in the above-mentioned publication, the thickness of the adhesive applied is reduced.
There is no particular standard for the relationship between the height of the embossed roller and the maximum height (maximum height difference) of the embossed roller, and a problem may occur depending on the relationship. That is, when the thickness of the adhesive layer formed by the adhesive coating is thinner than the maximum height difference H of the embossing roller, the unevenness of the embossing roller cannot be sufficiently formed by the embossing roller hitting the base material to be transferred. In addition, there have been many problems that the rotation of the emboss roller is heavy and that the transfer sheet is broken.

It is an object of the present invention to provide a transfer method capable of performing embossing as well as transfer while preventing the above-mentioned problems from occurring.

[0006]

In order to solve the above-mentioned problems, a transfer method according to the present invention uses a transfer sheet having a transfer layer provided on one side of a support sheet in a transfer method using a transfer sheet. The transfer layer side of the transfer sheet or /
And after forming an adhesive layer of a resin exhibiting thermoplasticity on the transfer-receiving surface side of the transfer-receiving base material, by pressing the embossing roller from the support sheet side of the transfer sheet, the transfer sheet to the transfer-receiving base material An embossing process is performed at the same time as the pressure bonding, and thereafter, the support sheet is peeled off, so that the transfer substrate is coated with a transfer layer in which a concavo-convex pattern is formed by the embossing process. The transfer and the embossing are performed such that the total thickness T of the thickness of the transfer sheet and the maximum height difference H of the unevenness of the emboss roller satisfy the relationship of the total thickness T ≧ the maximum height difference H.

In this manner, by defining the total thickness T of the adhesive layer and the transfer sheet and the maximum height difference H in a specific relationship, the embossing roller hits the base material to be transferred, and the unevenness of the embossing roller is sufficiently shaped. The embossing process can be smoothly performed together with the transfer by preventing the transfer sheet from being broken, the rotation of the emboss roller becoming heavy, and the transfer sheet being broken. In addition, since the adhesive layer is made of a resin exhibiting thermoplasticity, it is possible to easily form a concavo-convex pattern by embossing at the same time as pressing and pressing the transfer sheet against the transfer-receiving substrate. In addition, since the transfer roller (pressing roller) is also used as the emboss roller, the transfer roller portion is diverted by attaching the emboss roller instead of the transfer roller. It can be carried out.

Further, in the transfer method of the present invention, in the above method, the transfer and the embossing are further performed while the embossing roller is heated.

As a result, the adhesive layer or the like which is deformed by embossing to form a concavo-convex pattern is sufficiently heated and softened so that the transfer layer adheres to the substrate to be transferred and is embossed. As a result, transfer and embossing can be performed with less pressure, and the load on the transfer sheet and the substrate to be transferred can be reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the transfer method of the present invention will be described with reference to the drawings.

[Overview] FIG. 1 is a conceptual diagram showing one embodiment of the transfer method of the present invention. In the embodiment of FIG. 1, a transfer layer 2 is provided on one surface of a support sheet 1, and a transfer sheet S surface including the support sheet 1 and the transfer layer 2 faces the transfer layer side (the lower side in the drawing). Next, an adhesive made of a resin exhibiting thermoplasticity is applied by an adhesive applying device 14 such as a hot melt type to form the adhesive layer 3. On the other hand, the base material B to be transferred may be preheated to the transfer surface side by a preheating device 17a such as an infrared radiation heater, as needed, immediately before transfer and embossing. Further, in the same figure, the transfer sheet S can also be appropriately preheated and softened by the preheating device 17b. Then, after appropriately preheating the substrate to be transferred and the transfer sheet, the transfer sheet S is covered by the embossing roller 5 also serving as a transfer roller (pressing roller) with the resin adhesive layer 3 exhibiting thermoplasticity interposed therebetween. Press against transfer substrate B. The emboss roller 5
May be used in a heated state by an internal or external heater or the like. Alternatively, the embossing roller 5 may be used in a cooled state by passing cooling water through the inside. The temperature of the embossing roller 5 is set to an appropriate value in consideration of the degree of preheating of the transfer sheet and the adhesive layer, the material, the thickness, the pressing force of the embossing roller, the depth of the uneven pattern, the line speed, and the like. good. And the emboss roller 5
By pressing the transfer sheet S against the base material B, the adhesive layer 3 adheres to the base material B,
The (at least) adhesive layer 3 on the substrate to be transferred B is deformed by the emboss roller 5 via the transfer sheet S,
It is possible to form the concavo-convex pattern 6 on the transfer layer on the adhesive layer 3.

At this time, in the transfer method of the present invention, as shown conceptually in FIG. 2, the total thickness T of the adhesive layer 3 and the transfer sheet S and the maximum height difference H of the unevenness of the emboss roller 5 are determined. ,
The relationship of total thickness T ≧ maximum height difference H is satisfied. The total thickness T is the sum of the thickness t1 of the adhesive layer 3 and the thickness t2 of the transfer sheet S including the support sheet 1 and the transfer layer 2.
That is, T = t1 + t2. With such a relationship between the total thickness T and the maximum height difference H, even the highest convex portion of the emboss roller does not reach the inside of the base material B to be transferred, and the transfer and the embossing are performed. You can do it. As can be seen from the above thickness relationship, the present invention does not particularly limit the relative relationship between the thickness t1 of the adhesive layer and the thickness t2 of the transfer sheet S. Anyway, it is only necessary that the total thickness T, which is the sum of these, is equal to or greater than the maximum height difference H, which is the height difference between the highest portion and the lowest portion of the unevenness of the embossing roller. However, depending on the material of the transfer sheet and the processing conditions (temperature, etc.), the transfer sheet is deformed during embossing and does not decrease in thickness (not compressed).
It is more preferable that t1 ≧ H, that is,
It is preferable that the thickness t1 of the adhesive layer is not less than the maximum height difference H.

The transfer sheet S after passing through the embossing roller 5 is peeled off only after the support sheet 1 immediately after or after the passage, and the transfer is completed and the embossing is also completed. I do. And, as shown in FIG.
The adhesive layer 3 and the transfer layer 2 are laminated on the base material B to be transferred,
The surface of the transfer layer 2 has an uneven pattern 6 by embossing.
Thus, a transfer product D such as a cosmetic material on which is shaped is obtained.

Here, if one example of the transfer product obtained by the transfer method of the present invention is conceptually shown in the cross-sectional view of FIG. 5, the transfer product D is placed on the base material B (at least the transfer sheet is transferred). An adhesive layer 3 and a transfer layer 2 of a resin exhibiting thermoplasticity during pressing and embossing by pressing against a base material are laminated in this order, and the transfer layer has a concavo-convex pattern 6 on its surface.

In the transfer method of the present invention, the embossing roller also serves as a so-called transfer roller and embosses from above the transfer sheet. Therefore, embossing is performed on the transferred transfer layer surface after the support sheet is peeled off. Compared with the method, when forming a concavo-convex pattern on the surface of the transfer layer with an embossing roller, the portions other than the concave portions are not damaged or stained with dust. In addition, post-processing (cutting, cutting, assembling, construction, etc.) is performed as an intermediate processed product with the support sheet remaining on the surface of the transfer-receiving base material after embossing without being peeled off. Speaking of decorative materials, for example, after obtaining a final product such as a fitting, the support sheet can be peeled off, and the support sheet functions as a surface protective layer to prevent the occurrence of dirt and scratches during post-processing. You can do it. Further, in the transfer method of the present invention, as compared with a case where a decorative sheet on which a concavo-convex pattern has been formed in advance is laminated on a substrate by laminating, the concavo-convex pattern becomes shallow due to heat or pressure at the time of laminating the decorative sheet. , And there is no loss.

Hereinafter, the transfer method of the present invention will be further described.
It will be described in detail.

[Transfer Sheet] The transfer sheet S used in the present invention has a structure in which a transfer layer 2 is provided on one side of a support sheet 1, and the thickness of the transfer sheet is determined by the thickness of the transfer sheet and the adhesive layer 3. There is no particular limitation on the total thickness T as long as it is a thickness that is equal to or more than the maximum height difference H of the embossing roller and can be deformed at least so that the adhesive layer can be embossed via the transfer sheet. Conventionally known transfer sheets of various configurations can be used.

The support sheet 1 has good releasability from the transfer layer 2 and does not melt or break by the pressure or hot pressure during embossing, so that the unevenness of the emboss roller at least up to the transfer layer 2, more usually There is no particular limitation as long as it is a sheet having flexibility that can be transmitted to the adhesive layer 3, and it may be selected from conventionally known ones according to the application. For example, for the support sheet, polyethylene terephthalate, polybutylene terephthalate, ethylene-terephthalate-isophthalate copolymer, thermoplastic polyester resin such as polyester-based thermoplastic elastomer, polypropylene,
Polyolefin resins such as polyethylene, polymethylpentene, ethylene-propylene copolymer, ethylene-propylene-butene terpolymer, olefin-based thermoplastic elastomer, vinyl chloride resin, ethylene-vinyl acetate copolymer, ethylene-vinyl Resin films (sheets) such as alcohol copolymers, acrylic resins, polyamide resins, etc., or paper such as coated paper, glassine paper, sulfuric acid paper, etc., in which a release layer of a polyolefin resin or silicone resin is laminated on high quality paper, tissue paper, etc. A single-layered body or a laminated body made of, for example, is used. The thickness of the support sheet is preferably thin because embossing is performed with a transfer sheet interposed therebetween. However, if the thickness is too small, the mechanical strength of the support sheet is reduced.
m.

The support sheet may be provided with a release layer as a component of the support sheet on the transfer layer side, if necessary, in order to improve the releasability from the transfer layer. As the release layer, for example, a simple substance such as a silicone resin, a melamine resin, a polyamide resin, a urethane resin, a polyolefin resin, a wax, or a mixture containing these is used. Specifically, for example, a resin in which paratoluenesulfonic acid is preferably added to a mixed resin of a polyester resin and a melamine resin is preferable. In order to adjust the releasability, the surface of the support sheet on the transfer layer side may be subjected to corona discharge treatment, ozone treatment, or the like. Further, by forming the surface of the release layer into a desired uneven pattern, the surface of the transfer layer after the transfer layer is further released in addition to the uneven pattern formed through the support sheet from the embossing roller. The uneven pattern formed from the mold layer can also be formed by overlapping.

The transfer layer 2 is not particularly limited as long as it can be deformed during embossing, and may be a conventionally known one. For example, a decoration layer and the like are typical, and there is also a release layer and the like.
It is the adhesive layer only, the transfer layer only, or the adhesive layer and the transfer layer that are compressed and permanently deformed by the embossing process (assuming that the support sheet is excluded because it does not remain in the transfer product). Incidentally, the transfer sheet S illustrated in FIG.
Is an example in which the transfer layer 2 is provided on the support sheet 1 with the release layer 7, the pattern layer 8a, and the decorative layer 8 composed of the entire solid layer 8b.

As the decorative layer 8, for example, a conventionally known method such as gravure printing, silk screen printing, offset printing, and ink jet printing, a pattern layer obtained by printing a pattern with a material, aluminum, chromium, gold, silver, etc. A metal thin film layer or the like in which a metal is partially or entirely formed by using a known vapor deposition method or the like, and a material suitable for the intended use is used. The picture is, for example, a wood pattern, a stone pattern, a cloth pattern, a tile pattern, a brick pattern, a leather pattern, a character, a geometric pattern, a solid pattern, or the like. In particular, in the present invention, a concavo-convex pattern can be formed by embossing, and if it is used as a conduit groove pattern, a grain pattern or the like is one of suitable patterns. In addition, the ink for the picture layer is composed of a vehicle such as a binder, a coloring agent such as a pigment or a dye, and various additives appropriately added thereto, similarly to a general ink. As the resin of the binder, an acrylic resin, a vinyl chloride-vinyl acetate copolymer, a polyester resin, a cellulosic resin, a urethane resin, or the like, or a mixture containing them is used. As coloring agents, titanium white,
Inorganic pigments such as carbon black, red iron oxide, graphite, ultramarine blue, etc., organic pigments such as aniline black, quinacridone, isoindolinone, phthalocyanine blue, aluminum foil powder,
A glitter pigment such as foil powder of mica coated with titanium dioxide, or another dye is used.

The release layer 7 is provided as necessary as a layer in contact with the support sheet. The release layer is used to adjust the releasability between the support sheet and the transfer layer, and to protect the surface of the transfer layer after transfer, and to apply a surface protective layer on the transfer layer after transfer. Provided to improve suitability. For the release layer, for example, a resin or the like used as a binder of the picture layer ink is used. The release layer is formed by a conventionally known printing method or a coating method such as roll coating similarly to the decorative layer. The release layer is a component of the transfer layer, and is transferred to the transfer substrate side as a part of the transfer layer during transfer, and covers the surface of the transfer layer.

[Substrate to be Transferred] The substrate B to be transferred is not particularly limited. For example, the material of the substrate to be transferred is a wood type, an inorganic nonmetal type, a metal type, a plastic type, or the like. Specifically, in the wood system, for example, there are a veneer made of cedar, cypress, oak, lauan, teak, and the like, a plywood, a particle board, a fiber board, a laminated wood, and the like. In the case of inorganic nonmetals, for example, extruded cement, slag cement, ALC (lightweight cellular concrete), GRC (glass fiber reinforced concrete), pulp cement, wood chip cement, asbestos cement,
Non-ceramic ceramic materials such as calcium silicate, gypsum and gypsum slag; and inorganic materials such as ceramics such as earthenware, pottery, porcelain, tableware, glass, and enamel. Further, in the metal system, for example, there are metal materials such as iron, aluminum, and copper. In the case of plastics, for example, there are resin materials such as polypropylene, ABS resin, and phenol resin.

The shape of the substrate to be transferred is not particularly limited as long as it can be transferred and embossed on the surface to be transferred.
It is optional with a columnar object or the like. In addition, the cross-sectional shape of the columnar object
There are a convex polygonal shape, a concave polygonal shape, a circular shape, an oval shape, a square shape, and the like. One form of this rectangular cross section is a plate material. The substrate to be transferred may be subjected to a known sealing treatment, a coloring coating treatment, or the like, as necessary. Needless to say, these processes are performed before the formation of the adhesive layer when the adhesive layer made of a resin exhibiting thermoplasticity is formed on the transfer-receiving substrate side.

[Adhesive Layer] As the adhesive layer 3, a resin exhibiting thermoplasticity at least at the time of embossing is used. A typical example of the resin is a thermoplastic resin, but a curable resin can also be used as long as it exhibits thermoplasticity before curing. The resin exhibiting thermoplasticity may be appropriately selected from known resins according to the material of the transfer substrate and the transfer layer to be bonded.

For example, as the thermoplastic resin, a thermoplastic urethane resin, a thermoplastic polyester resin, an acrylic resin, a polyamide resin, a vinyl chloride-vinyl acetate copolymer or the like can be used. Also, for example, polypropylene,
Polyolefin resins such as polyethylene, polymethylpentene, ethylene-propylene-butene terpolymer, and olefin-based thermoplastic elastomer can also be used.

As the curable resin, for example, a one-component moisture-curable urethane resin, an ionizing radiation-curable resin, or the like can be used. In addition, even with thermosetting urethane resin, adjusting the preheating conditions of the substrate to be transferred and the transfer sheet,
If, for example, a block isocyanate is used as the isocyanate, so that it exhibits thermoplasticity during embossing,
Can be used. Uses a curable resin as an adhesive, performs embossing while exhibiting thermoplasticity while uncured, and then cures over time, resulting in good embossability and durability of the embossed uneven pattern Both are compatible. Further, in the transfer product, the heat resistance, the adhesion and the like of the adhesive layer can be improved.

The one-component moisture-curable urethane resin is a composition containing a prepolymer having an isocyanate group at a molecular terminal as an essential component. The prepolymer is usually a polyisocyanate prepolymer having one or more isocyanate groups at both molecular terminals, and is a solid thermoplastic resin at normal temperature. The isocyanate groups react with each other due to moisture in the air to cause a chain extension reaction. As a result, a reactant having a urea bond in the molecular chain is generated, and the isocyanate group at the molecular end further reacts with the urea bond. , Causing biuret bonding and branching to cause a crosslinking reaction. The skeleton structure of the molecular chain of the prepolymer having an isocyanate group at the molecular terminal is arbitrary, and specific examples include a polyurethane skeleton having a urethane bond, a polyester skeleton having an ester bond, and a polybutadiene skeleton. One or more of these skeletal structures are appropriately employed. When there is a urethane bond in the molecular chain, the terminal isocyanate group also reacts with the urethane bond,
An allophanate bond is generated, and a cross-linking reaction is also caused by the allophanate bond.

As the thermosetting urethane resin, a urethane resin having a polyol as a main component and an isocyanate as a crosslinking agent (curing agent) is usually used as a two-component curable urethane resin. The polyol has two or more hydroxyl groups in the molecule, and examples thereof include polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol, polycarbonate polyol, and polyurethane polyol. Also, as the isocyanate,
A polyvalent isocyanate having two or more isocyanate groups in the molecule is used. For example, 2,4-tolylene diisocyanate, xylene diisocyanate, 4,4 '
Aromatic isocyanates such as -diphenylmethane diisocyanate, or aliphatic (or alicyclic) isocyanates such as 1,6-hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate, or any of the above An isocyanate adduct or multimer can also be used. For example, there are an adduct of tolylene diisocyanate and a trimer of tolylene diisocyanate.

Further, these isocyanates may be used as blocked isocyanates, and the reaction may be started by releasing the blocks by heating. The blocked isocyanate is a compound in which the isocyanate is temporarily reacted with a blocking agent such as alcohols, phenols, and amines to prevent (block) the reactivity of the isocyanate group. Usually, in order to lower the dissociation temperature of the blocking agent to an appropriate temperature range, as a dissociation catalyst,
Known products such as metal soaps and amines are used.

As the ionizing radiation-curable resin, a resin (composition) which exhibits a solid state at room temperature when not cured and can be crosslinked and cured by ionizing radiation can be used. For example, the following ionizing radiation curable resins (I) and (II) can be used.

(I) having a radically polymerizable unsaturated group,
The following two types of thermoplastic resins (1) or (2). (1) Those having a radical polymerizable unsaturated group in a polymer having a glass transition temperature of 0 to 250 ° C. More specifically, a polymer obtained by polymerizing or copolymerizing the following can be used by introducing a radical polymerizable unsaturated group by methods (a) to (d) described below. In the following, for example, (meth) acrylate is used to mean acrylate or methacrylate. A monomer having a hydroxyl group; N-methylol (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate,
2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, and the like. Monomers having a carboxyl group; (meth) acrylic acid, (meth) acryloyloxyethyl monosuccinate and the like. Monomers having an epoxy group; glycidyl (meth) acrylate and the like. Monomers having an aziridinyl group; 2-aziridinylethyl (meth) acrylate, allyl 2-aziridinylpropionate, and the like. A monomer having an amino group; (meth) acrylamide, diacetone (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, and the like. A monomer having a sulfone group; 2- (meth) acrylamido-2-methylpropanesulfonic acid and the like. A monomer having an isocyanate group; an adduct of a diisocyanate and a radical polymerizable monomer having active hydrogen, such as an adduct of 1 to 1 mol of 2,4-toluene diisocyanate and 2-hydroxyethyl (meth) acrylate; A monomer other than the above which is copolymerizable with the above-mentioned monomer; this monomer is used as a copolymer component for controlling the glass transition temperature and physical properties of the obtained copolymer.
For example, methyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, isoamyl (meth) acrylate,
Cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and the like.

Next, the polymer or copolymer obtained as described above is reacted by the following methods (a) to (d) to introduce a radical polymerizable unsaturated group. (a) In the case of a polymer or copolymer of a monomer having a hydroxyl group, a monomer having a carboxyl group such as the aforementioned (meth) acrylic acid is subjected to a condensation reaction. (b) In the case of a polymer or copolymer of a monomer having a carboxyl group or a sulfone group, the above-mentioned monomer having a hydroxyl group is subjected to a condensation reaction. (c) In the case of a polymer or copolymer of a monomer having an epoxy group, an isocyanate group, or an aziridinyl group, the above-mentioned monomer having a hydroxyl group or the above-described monomer having a carboxyl group is subjected to an addition reaction. (d) In the case of a polymer or copolymer of a monomer having a hydroxyl group or a carboxyl group, the monomer having the epoxy group or the monomer having the aziridinyl or the diisocyanate compound and the hydroxyl group-containing acrylate monomer A monomer having an isocyanate group such as 1 mole to 1 mole of an adduct is
Addition reaction is performed. In order to carry out the above reaction, it is desirable to add a trace amount of a polymerization inhibitor such as hydroquinone and to carry out the reaction while sending dry air.

(2) A compound having a melting point of 20 ° C. to 250 ° C. and having a radically polymerizable unsaturated group. Specific examples include triazine (meth) acrylate, stearyl (meth) acrylate, triacryl isocyanurate, cyclohexanediol di (meth) acrylate, spiroglycol diacrylate, spiroglycol (meth) acrylate, and the like.

The above (1) and (2) can be used as a mixture. Furthermore, the above (1) or (2), or (1) and
A radical polymerizable monomer can be added as a reactive diluent to the mixture of (2). The radical polymerizable monomer increases the crosslink density by irradiation with ionizing radiation such as ultraviolet rays or electron beams, and improves heat resistance and surface properties. Examples of the monomer include ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate,
Hexanediol di (meth) acrylate, trimethylolpropane di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate , Dipentaerythritol hexa (meth) acrylate, ethylene glycol diglycidyl ether di (meth) acrylate, polyethylene glycol diglycidyl ether di (meth) acrylate, propylene glycol diglycidyl ether di (meth) acrylate, polypropylene glycol diglycidyl ether di Use of (meth) acrylate, sorbitol tetraglycidyl ether tetra (meth) acrylate, etc. It can be. The blending amount is (1) or
With respect to 100 parts by mass of the resin alone or as a mixture of (2),
It is preferable to use 0.1 to 100 parts by mass.

(II) An ionizing radiation curable resin obtained by mixing a non-crosslinkable resin which is a thermoplastic solid at room temperature with an ionizing radiation curable resin which is liquid at room temperature. (A) A composition comprising an ionizing radiation-curable resin which is liquid at room temperature; a prepolymer or a monomer having a radically polymerizable unsaturated group in a molecule, alone or as a mixture. Alternatively, it is a composition comprising a prepolymer or monomer having a cationically polymerizable functional group. Examples of the prepolymer having a radical polymerizable unsaturated group include polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, and melamine (meth) acrylate. Monomers having a radical polymerizable unsaturated group include, for example, monofunctional monomers such as methyl (meth) acrylate, diethylene glycol di (meth) acrylate, trimethylpropane tri (meth) acrylate, and dipentaerythritol hexa (meth) acrylate. There are polyfunctional monomers. Examples of the prepolymer having a cationically polymerizable functional group include prepolymers of epoxy resins such as bisphenol epoxy resins and novolak epoxy compounds, and vinyl ether resins such as fatty acid vinyl ethers and aromatic vinyl ethers.

(B) The non-crosslinked resin is a thermoplastic resin which does not contribute to the crosslinking and curing reaction due to ionizing radiation and is solid at room temperature. Examples thereof include an acrylic resin, a cellulose resin, a polyester resin, and a vinyl acetate resin. And vinyl resins such as vinyl chloride-vinyl acetate copolymers and butyral resins. Above all, it is an acrylic resin having an average molecular weight of 50,000 to 600,000 and a glass transition temperature of 5
Those having a temperature of 0 to 130 ° C. have a non-adhesive property at room temperature uncured (touch dry property), an adhesive property by heat fusion, a flexibility at transfer (uncured) (moldability), and an embossing suitability. It is preferable in terms of absorption and relaxation of stress after curing.

The term “normal temperature” used in the ionizing radiation-curable resin refers to the formation of an adhesive layer on a transfer sheet or a transfer-receiving group.
This means the indoor (or outdoor) ambient temperature at which the resulting product is temporarily stored, transferred and embossed, and the support sheet is peeled off. The specific value varies depending on the climate and working environment, but is usually in the range of 10 to 40 ° C., more generally 1
It is in the range of 5 to 25C. Room temperature is the lowest temperature at which the support is peeled off.

When curing with ultraviolet rays, a photopolymerization initiator is further added to the ionizing radiation-curable resin (I) or (II). The photopolymerization initiator uses acetophenones, benzophenones, thioxanthones, benzoin, benzoin methyl ethers alone or in a mixture in a radical polymerization system, and an aromatic diazonium salt, an aromatic sulfonium salt, and an aromatic iodonium salt in a cationic polymerization system. , A metallocene compound, a benzoinsulfonic acid ester or the like is used alone or in combination. In addition, as the ionizing radiation, an electromagnetic wave or a charged particle having energy capable of crosslinking the molecules in the adhesive is used. Those commonly used are ultraviolet rays or electron beams. As the ultraviolet light source, a light source such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light, and a metal halide lamp is used. As the electron beam source, various electron beam accelerators such as Cockcroft-Walton type, Van degraft type, resonance transformer type, insulating core transformer type, or linear type, dynamitron type, high frequency type, etc., are used at 100 to 1000 keV,
Preferably, one that irradiates electrons having an energy of 100 to 300 keV is used.

The method for forming the adhesive layer from the above-mentioned thermoplastic resin is not particularly limited. The adhesive layer is formed by dissolving (or dispersing) the resin in a solvent (or dispersion medium) such as water or an organic solvent (or a dispersion) (specifically, for example, an organic solvent solution or water). Dispersion emulsion or the like) or in the form of a hot melt. The object on which the adhesive layer is formed is a transfer sheet, a substrate to be transferred, or a transfer sheet and a substrate to be transferred. The method for forming the adhesive layer is conventionally known depending on the object and the surface on which the adhesive layer is formed (a single flat surface on a transfer sheet or a plate-shaped transfer substrate, a concave-convex surface on a columnar transfer substrate, or the like). May be used.
For example, roll coating, spray coating, curtain flow coating, gravure coating, comma coating, and the like. Alternatively, a printing method such as silk screen printing is used. Also,
When a resin such as a polyolefin resin, which is difficult to form a solution (including a dispersion liquid), is used for the adhesive layer, it may be formed by a melt extrusion coating method using a T-die or the like. The adhesive layer may be formed before the transfer sheet is pressed against the transfer substrate, or may be formed before the transfer sheet. For example,
An adhesive layer may be formed in advance off-line, and the formed product (transfer sheet or base material to be transferred) may be temporarily stored.

The thickness t1 of the adhesive layer is not particularly limited,
Total thickness T of thickness t1 of the adhesive layer and thickness t2 of the transfer sheet
However, the maximum height difference H of the unevenness of the emboss roller is not less than H.
However, it is usually 5 μm or more from the standpoint of expressing the adhesive function. In addition, since the transfer layer mainly composed of a decoration layer is usually thin, in this case, the unevenness due to embossing is mainly caused by the adhesive layer mainly taking on its depth.
It is more preferable that the thickness t1 itself be equal to or larger than the maximum height difference H. From the above, the thickness of the adhesive layer usually depends on the depth of the concavo-convex pattern to be formed, but is 5 to 1
The range is about 00 μm.

It should be noted that in FIG.
7a, when forming an adhesive layer on the transfer-receiving substrate side,
If the heating means is hot air or the like, it may be used as a device for drying volatile components such as a solvent in the adhesive. Similarly, the preheating device 17b on the transfer sheet side may be used as a device for drying the volatile components in the adhesive. The preheating devices 17a, 17b
For example, a device using a known heating means such as hot air, an infrared heater, and a dielectric heater may be used. When the organic solvent in the adhesive is also used for drying, the preheating devices 17a and 17b are provided with explosion-proof,
From the viewpoint of fire prevention, it is desirable to use hot air instead of an infrared heater.

When a curable resin is used as the resin of the adhesive layer, the transfer sheet is pressed against the substrate to be transferred.
After the pressing and embossing of the transfer sheet are performed, the curing reaction of the curable resin may be advanced to complete. The progress of the curing reaction may partially progress during the press bonding and the embossing, or may be in progress, as long as it exhibits thermoplasticity. By this thermoplasticity, the adhesive layer can be denatured by embossing, and at least the adhesive layer can be used to form a concavo-convex pattern on the transfer layer. The completion of the curing reaction
It may be before or after the support sheet is peeled off.

[Transfer and Embossing] The transfer and embossing, (more precisely, the transfer up to the completion of peeling of the support sheet is referred to as transfer), the pressing and embossing of the transfer sheet are performed only when the transfer surface is flat. Pressure roller (transfer roller)
Roller transfer method (Japanese Patent Publication No. 60-5987)
No. 6, JP-A-5-270199, JP-A-5-270199
No. 139097), a transfer method in which the pressing roller is replaced with an embossing roller may be used, or a plurality of pressing rollers (transfer roller ), The so-called lapping transfer method (see Japanese Patent Publication No. 59-51900, Japanese Patent Application Laid-Open No. 5-330013, Japanese Patent Publication No. 3-2666, etc.) is performed by replacing the pressing roller with an embossing roller. A transfer method may be used.

In the transfer method of the present invention, the support sheet may be peeled immediately after the transfer sheet has passed through the embossing roller, or after a short time after the transfer sheet has passed (see FIG. 3).

Here, with reference to a conceptual view of FIG. 3 shown in a perspective view, an example in which the transfer method of the present invention is applied to the lapping transfer method will be further described.

In FIG. 3, a columnar substrate B to be transferred is
The transfer sheet S is placed on the plurality of feed rollers 16 and transported in the longitudinal direction (arrow direction) of the substrate to be transferred, and the transfer sheet S is moved relative to the substrate to be transferred at a speed synchronized with the transport speed of the substrate to be transferred. The embossing is performed by pressing the transfer sheet against the transfer substrate by the emboss rollers 12a to 12d and performing embossing in a direction substantially orthogonal to or orthogonal to the longitudinal direction of the transfer substrate for each small area. Perform step by step. In the figure, each side of the substrate to be transferred is a surface having a polygonal cross section, and each side forms a single plane, so each side has its own dedicated emboss. Use rollers. Pressing (and embossing) of the transfer sheet by pressing the transfer sheet against the transfer base material by the embossing roller is performed by the embossing roller 12.
a, the embossing roller 12b, the embossing roller 12c, and the embossing roller 12d are sequentially pressed so as to sequentially press the adjacent side surfaces for each small area, thereby performing the pressure bonding and the embossing. It should be noted that only the embossing roller provided on the front side of the drawing with respect to the substrate to be transferred is shown for simplification of the drawing.

As the embossing roller, a known embossing roller made of a metal such as iron (alloy) or copper, or ceramics can be used.

Further, the emboss roller may be used in a heated state. In this case, it is possible to omit pre-heating the adhesive layer, the substrate to be transferred, and the like, or to perform the pre-heating at a lower temperature so that the embossing process can easily form an uneven pattern. Conversely, if sufficient preheating of the adhesive layer, the substrate to be transferred, and the like is performed, the emboss roller can be cooled and used without heating. This is for pressing the embossing roller to form an uneven pattern and simultaneously fixing the uneven shape formed on the adhesive layer exhibiting thermoplasticity by cooling the adhesive layer and the like. Here, the term “cooling” or “heating” is referred to as “heating” when the temperature is higher than the temperature of the transfer sheet and / or the adhesive layer immediately before reaching the embossing roller, and the term “cooling” is used when the temperature is lower than the temperature.

Then, after the transfer sheet is pressed against the base material to be transferred and embossed at the same time, in FIG.
When only the support sheet 1 of the transfer sheet S is peeled off according to a to 13c, a transfer product D such as a decorative material is obtained. The support sheet may be peeled off manually.

As shown conceptually in FIG. 3, in the transfer and embossing device, when the transfer sheet is pressed against the substrate to be transferred, an adhesive layer is formed on the transfer sheet S by the adhesive coating device 14. (A preheating device for drying the solvent content in the layer or preheating the transfer sheet as necessary is not shown). Further, the transfer base material B may be preheated and supplied by a preheating device 15 such as hot air or an infrared heater. The same applies to the case where the present invention is applied to the roller transfer method other than the case where the present invention is applied to the lapping transfer method.

[Concavo-convex pattern] The concavo-convex pattern 6 formed by embossing is not particularly limited (see FIG. 5). The uneven pattern is, for example, a wood grain conduit groove, a grain of sand, a joint groove such as tile or brick application, a skin squeezing, a rough pattern of a cleavage surface of granite, a satin finish, a hairline, a linear groove, a wood grain ring pattern, a texture of cloth surface. , Characters, geometric patterns, etc. The depth of the uneven pattern depends on the total thickness T of the adhesive layer and the transfer layer, but is, for example, about 30 to 100 μm.

Further, a colored portion may be formed by filling and solidifying a colored ink by a known wiping method or the like in the concave portion of the concavo-convex pattern (after the support sheet is peeled off). In particular, by filling a colored ink into a concave portion serving as a wood grain conduit or the like and solidifying the colored ink to form a colored portion, a wood grain conduit groove or the like with a richer design feeling can be expressed. Further, a known surface protective layer may be formed on the outermost surface of the transfer product by resin coating or the like.

[Use of Transfer Product] The use of the transfer product obtained by the transfer method of the present invention is not particularly limited. For example, window frames, doors, handrails, sills, doors and other fixtures, wall interiors, ceilings, floors, and other building interior materials, exterior walls, fences, roofs, gates, exterior materials such as gable boards, furniture such as chests, and televisions Weak electricity / O of receivers, etc.
It is used as a cabinet for A equipment, interior materials for vehicles such as cars, trains, aircraft, ships, etc., and containers for small items.

[0055]

The present invention will now be described by way of Examples and Comparative Examples.
This will be described more specifically.

EXAMPLE As a transfer sheet S as shown in FIG. 4, a transfer layer 2 was formed on one side of a support sheet 1 made of a biaxially stretched polyethylene terephthalate film having a thickness of 25 μm.
As a release layer 7 of acrylic resin (2 μm thick)
And the binder resin is an acrylic resin, and a woodgrain pattern pattern layer 8a (thickness: 3 μm) made of a red ink, a color ink mainly containing graphite and phthalocyanine blue as a coloring agent.
m), the binder resin is an acrylic resin, and as a colorant, titanium white, red stencil, carbon black, and a solid ink 8h (thickness 2
μm), a transfer sheet (transfer sheet thickness t2 = 32 μm) was prepared in this order by gravure rotary printing multicolor printing.

The transfer and the embossing were performed by the lapping transfer method as conceptually shown in FIG. First, a hot-melt type adhesive is melt-coated with an adhesive coating device 14 on the transfer layer side surface in-line when the transfer sheet S is laminated on the transfer-receiving substrate B, and the adhesive layer (adhesion) is performed. (Thickness t1 of the agent layer = 60 μm). The adhesive is a one-component moisture-curable urethane resin-based adhesive (a thermoplastic solid at room temperature when uncured. Nippon NSC Co., Ltd.)
70-7310) and melt-coated at a coating temperature of 60 ° C. The total thickness T of the adhesive layer and the transfer sheet was 92 μm.
It is.

On the other hand, the substrate to be transferred B is a columnar MD.
F (woody medium density fiberboard) was used. Then, while preliminarily preheating the surface of the transfer-receiving surface to 80 ° C. by using a preheating device, the transfer sheet having the adhesive layer formed thereon is transferred to a plurality of side surfaces of the transfer-receiving substrate to be transferred. Then, it was pressed in sequence by a plurality of embossing rollers, pressed and embossed. The embossing roller is a metal roller having a large number of wood-grain conduit groove-shaped projections (maximum height difference H = 50 μm), and was used by adjusting the surface temperature to 20 ° C. by passing cooling water through the internal cavity. Thereafter, the support sheet was peeled off by a peeling roller. Then, the resin of the adhesive layer was completely cured by moisture to become a cured product. As a result, as the transferred product D, a high-design wood decorative material (plate) is obtained in which not only the wood pattern by the decorative layer but also the concave and convex pattern of the conduit groove characteristic of the wood design are simultaneously formed by embossing. Was.

Comparative Example An attempt was made to obtain a transfer product in the same manner as in the example, except that the thickness t1 of the adhesive layer was changed from 60 μm to 10 μm. The total thickness T of the adhesive layer and the transfer sheet is 42 μm.

[Evaluation Results] Examples and Comparative Examples in which the relationship between the total thickness T of the adhesive layer and the transfer sheet and the maximum height difference H of the emboss roller was changed by changing the thickness of the adhesive layer. Table 1 shows the evaluation results.

[0061]

[Table 1]

In the embodiment, the total thickness T (92 μm) is larger than the maximum height difference H (50 μm) of the emboss roller, and the thickness t1 (60 μm) of the adhesive layer is also larger than the maximum height difference H (50 μm).
Great against. In this example, no defect due to transfer and embossing occurred, and the yield, that is, the non-defective rate was 99%, which was satisfactory. However, the comparative example
The total thickness T (42 μm) is smaller than the maximum height difference H (50 μm), and, of course, the thickness t1 (10 μm) of the adhesive layer
Is also smaller than the maximum height difference H. For this reason, in this comparative example, in addition to the transfer sheet being torn in the transfer and the embossing, there was a problem that the embossing roller hit the transfer-receiving substrate and the rotation became heavy. For this reason, in the comparative example, the yield was reduced to 35%.

[0063]

According to the transfer method of the present invention, by setting the total thickness T of the adhesive layer and the transfer sheet to be equal to or greater than the maximum height difference H of the unevenness of the embossing roller, the shaping of the uneven pattern is not performed. The embossing can be performed smoothly together with the transfer by preventing the transfer sheet from becoming insufficient, causing the embossing roller to hit the base material to be transferred, causing the rotation thereof to become heavy, and preventing the transfer sheet from being broken. As a result, the yield can be significantly improved. In addition, since the adhesive layer is made of a resin exhibiting thermoplasticity at least at the time of embossing, the concavo-convex pattern can be easily formed by embossing at the same time that the transfer sheet is pressed against the base material to be transferred and pressed. In addition, since the pressing roller (transfer roller) is also used as the embossing roller, the transfer roller and the embossing can be easily performed by using the pressing roller portion instead of the pressing roller and diverting the pressing roller portion. It can be done at the same time.

Further, if transfer and embossing are performed in a state where the embossing roller is heated, the adhesive layer and the like, which is a layer on which an embossed pattern is formed by embossing, is transferred to a state where it is sufficiently heated and softened. Since the layer can be adhered to the substrate to be transferred and embossed, transfer and embossing can be performed with less pressure, and the load on the transfer sheet and the substrate to be transferred can be reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram conceptually illustrating a transfer method of the present invention.

FIG. 2 shows a total thickness T and a maximum height difference H in the transfer method of the present invention.
FIG. 3 is a conceptual diagram conceptually illustrating the relationship between the image and the image.

FIG. 3 is a conceptual view (perspective view) conceptually illustrating a case where the transfer method is performed by a lapping transfer method as one embodiment of the present invention.

FIG. 4 is a sectional view showing an example of a transfer sheet that can be used in the transfer method of the present invention.

FIG. 5 is a sectional view showing an example of a transfer product obtained by the transfer method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support sheet 2 Transfer layer 3 Adhesive layer 5 Emboss roller 6 Concavo-convex pattern 7 Release layer 8 Decorative layer 8a Pattern pattern layer 8b All solid layer 12, 12a-12d Emboss roller 13, 13a-13c Release roller 14 Adhesive coating Apparatus 15 Preheating device 16 Feed roller 17a, 17b Preheating device B Transfer substrate D Transfer product H Maximum height difference of unevenness of emboss roller S Transfer sheet T Total thickness of adhesive layer and transfer sheet t1 Thickness of adhesive layer t2 Transfer sheet thickness

Claims (2)

[Claims] 1. A transfer method using a transfer sheet, wherein a transfer sheet having a transfer layer provided on one side of a support sheet is used, and the transfer layer side of the transfer sheet and / or the transfer surface side of the base material to be transferred. After forming an adhesive layer of a resin exhibiting thermoplasticity, by pressing an embossing roller from the support sheet side of the transfer sheet, the transfer sheet is pressed against the transfer-receiving substrate and simultaneously embossed, Thereafter, the support sheet is peeled off to cover the transfer-receiving substrate with a transfer layer in which an embossed pattern is formed, and the transfer layer has a total thickness T of the adhesive layer and the transfer sheet. Transfer and embossing are performed so that the maximum height difference H of the unevenness of the emboss roller is in the relationship of the total thickness T ≧ the maximum height difference H,
Transfer method. 2. The transfer method according to claim 1, wherein the transfer and the embossing are performed while the embossing roller is heated.