JP2950599B2 - Transfer sheet - Google Patents

Description

The present invention relates to a transfer sheet.

[Prior art] As a transfer sheet, a transfer sheet is formed by providing a pattern layer or the like made of a transparent printing ink on a transparent sheet base material, and the transfer sheet is used as an uncured ionizing radiation-curable resin layer (as an adhesive layer). Function) is interposed and closely adhered to the transfer receiving body, and then the resin layer is cured by irradiation with ionizing radiation. Finally, the sheet base material is peeled off to cover the pattern layer and the like. There is known one that transfers the image to the transfer body.

Such a transfer sheet is often used mainly for designing decorative boards and the like, and in such a case, a clear top coat for protecting the surface is further provided on the surface of the transfer layer including a picture layer after transfer. A layer is applied.

[Problems to be solved by the invention]

However, when the conventional transfer sheet is brought into close contact with an object to be transferred via an ionizing radiation-curable resin layer, the uncured ionizing radiation-curable resin penetrates a pattern layer or the like of the transfer sheet to the surface side of the layer. The phenomenon of leaching occurs, and as a result, when the irradiation of ionizing radiation for curing the resin of the resin layer is performed strongly (when irradiation is performed under the perfect curing condition or more), the ionized radiation curable resin leached as described above is obtained. Fully cured,
Even if a top coat layer is formed on a transferred picture layer in which such a cured resin is present, there has been a problem that adhesion is poor and a good layer cannot be formed.

The bleeding phenomenon of the resin as described above occurs because a picture layer or the like that is printed and formed in a solid shape over the entire surface is not strictly a complete film shape (for example, by a gravure printing method). The formed pattern layer has only the printing ink on the cells, and the uncured resin easily penetrates). In addition, the poor adhesion of the top coat layer formed on the transfer layer in which the cured resin is present due to bleeding is caused by the fact that when the ionizing radiation-curable resin is cured, the adhesiveness of the cured resin layer is reduced by high-density three-dimensional crosslinking. It is.

If the irradiation of ionizing radiation during the transfer is weakened (that is, the exuded resin is kept in a semi-cured state), it is possible to form a top coat layer with good adhesion. There are restrictions such as the necessity of concentration adjustment or the like so that a weak ionizing radiation can be sufficiently transmitted through a picture layer or the like located on the irradiation line of the radiation. Further, depending on the concentration conditions of the picture layer set according to design requirements, etc., the weak ionizing radiation does not penetrate the picture layer well and the resin is not sufficiently cured, so that it is necessary to increase the irradiation intensity after all. And the above-mentioned inconvenience could not be avoided.

The present invention has been made to overcome the above problems,
Provided is a transfer sheet that does not cause the bleeding phenomenon due to the ionizing radiation-curable resin and can form a resin layer such as a top coat layer having good adhesion on the surface of a transfer layer composed of a pattern layer or the like after transfer without any trouble. The purpose is to do.

[Means for solving the problem]

The transfer sheet of the present invention is provided with at least a decorative layer on the peelable surface of the ionizing radiation-permeable sheet having a peelable surface, and the decorative layer is transferred to the transfer target via the ionizing radiation-curable resin layer. The transfer sheet is characterized in that a transparent ionizing radiation-curable resin permeation blocking layer having transparency is provided on the entire surface of the transparent sheet on the decorative layer forming surface side. Further, the ionizing radiation transmitting sheet is provided with an ionizing radiation shielding pattern layer on one or both surfaces.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The transfer sheet 1 of the present invention is an ionizing radiation permeable sheet 2 having releasability.
And a decorative layer 3 and an ionizing radiation-curable resin permeation blocking layer 4 provided on the releasable surface of the sheet 2.

The permeation barrier layer 4 is a layer for preventing the uncured resin of the ionizing radiation-curable resin layer from seeping out to the surface of the transfer layer comprising the decorative layer during the transfer of the transfer sheet of the present invention. Therefore, the formation position of the permeation blocking layer 4 is not limited to the position on the decoration layer 3 (FIG. 1), but may be between the decoration layer 3 and the sheet 2 as shown in FIG. Further, the permeation blocking layer 4 has a degree of transparency that does not obscure at least the decorative layer and the like, and has a degree of ionizing radiation transparency, and is formed entirely at the above-mentioned predetermined position. In forming the permeation barrier layer 4, as a material thereof, for example, a thermosetting acrylic emulsion, a melamine resin-added acrylic emulsion, a melamine resin, an unsaturated polyester resin, a two-part curable acrylic urethane, polyester urethane, or the like can be used. Resin-based, ethyl cellulose, ethyl hydroxyethyl cellulose, cellulose acetate propionate, cellulose derivatives such as cellulose acetate, polystyrene, styrene resin such as poly α-methyl styrene and styrene copolymer resin, polymethyl methacrylate, polymethacryl Acrylic or methacrylic resin such as ethyl acrylate, polybutyl acrylate, etc. homo- or copolymer resin, rosin, rosin-modified phenol resin, rosin ester resin such as polymerized rosin, polyvinyl acetate resin , Chroman resin, vinyl toluene resin, vinyl chloride resin, polyester resin, polyurethane resin, butyral resin, polyamide resin, those based on one or more thermoplastic resins such as vinyl chloride-vinyl acetate copolymer resin, and further, For example, a resin based on a mixed resin of the thermosetting resin and the thermosetting resin is used. Then, these resin materials are coated on the entire surface by a suitable coating means. In addition to the gravure coating method, a gravure reverse coating method, a gravure offset coating method, a roll coating method, a reverse roll coating method, and the like can be applied as a coating means. The permeation barrier layer needs to be a coating film (resin layer) having no through-holes through which the uncured ionizing radiation-curable resin penetrates. It is preferable to apply the coating repeatedly.

The thickness of the barrier layer 4 is about 5 to 20 μm. When the thickness is less than 5 μm, the ionizing radiation-curable resin is easily transmitted. On the contrary, when the thickness exceeds 20 μm, delamination between layers in contact with the barrier layer or There is a problem that breakage or the like easily occurs.

The ionizing radiation permeable sheet 2 has a property of transmitting ionizing radiation, and when the ionizing radiation is ultraviolet, for example, a sheet or film made of polyester, polyamide (eg, nylon), polypropylene, fluororesin, or the like is used. It is desirable that the pigment does not contain a pigment which has an influence on ultraviolet transmittance. When the ionizing radiation is an electron beam, the transparency of the electron beam itself is high, so there is not much restriction. The above-mentioned sheet or film having the property of transmitting ultraviolet rays can be used in principle, and paper or the like can also be used. it can. Further, since the sheet 2 is to be finally peeled and removed, it is necessary that the surface supporting the decorative layer and the like be at least peelable. If the sheet itself is releasable, if it is not releasable, it is used by providing a releasable layer by applying a releasable resin or composition or the like. Sheet 2 thickness is 5 to 200
μm, particularly preferably 25 to 100 μm.

The decorative layer 3 is composed of a colored layer, a picture layer, and the like that can be designed on the transfer object. The decorative layer 3 has a property of transmitting at least ionizing radiation applied during transfer. The decorative layer is formed by a known printing means using various paints or inks according to the use or the like. The decorative layer needs to be ionizing radiation-transmissive as described above. For example, in order to secure ultraviolet transmissivity, it is better to avoid excessive use of pigments and fillers that impede ultraviolet transmissivity, and to color with dye. It is better to use a pigment having a very small particle size. The decorative layer 3 may be formed as a uniform layer (so-called solid layer) or may be formed in a pattern.

Further, the sheet 1 of the present invention is provided with an ionizing radiation shielding pattern layer 5 as shown in FIG. The shielding pattern layer 5 serves as a mask pattern for shielding ionizing radiation when the ionizing radiation is irradiated from the upper surface side of the transfer sheet and for partially curing an ionizing radiation-curable resin layer described later. In this sense, the position where the shielding pattern layer 5 is provided is not limited to the lower surface side of the transparent sheet 2 as illustrated in FIG. 4, but may be the upper surface side of the sheet 2 or the upper and lower surfaces. As the material for forming the shielding pattern layer 5, when the ionizing radiation is ultraviolet light, a substance that reflects and shields the ultraviolet light, for example, a filler such as titanium oxide, potassium sulfate, calcium carbonate,
Alternatively, an ink containing a pigment having a large hiding power with a particle diameter of about 0.3 to 10 μm, a substance that absorbs ultraviolet light, for example, an ultraviolet absorber such as a benzophenol-based, salicylate-based, benzotriazole-based, or acrylonitrile-based, a light-absorbing pigment And inks containing a quencher (for example, a metal complex salt or a hindered amine) together with carbon black or an inorganic substance. When the ionizing radiation is an electron beam, examples of the ink include the above-described inks and inks containing other pigments. The thickness of the pattern layer 5 is about 5 to 300 μm.

The transfer process using the transfer sheet 1 of the present invention having the above configuration will be described below.

First, as shown in FIG. 3 (a), an ionizing radiation-curable resin layer 7 for transferring the decorative layer 3 and the like to the transfer object 6 side is interposed between the transfer sheet 1 and the transfer object 6. Thus, for example, a coating is formed on the transfer-receiving body 6. Next, as shown in FIG. 2B, the transfer sheet 1 is interposed via the resin layer 7.
Is superimposed on and closely adhered to the transfer object 6, and then the transfer sheet 1 is
Irradiation radiation 8 such as ultraviolet rays and electron beams is applied from the side. The irradiation cures the ionizing radiation-curable resin, and at the same time as the curing, the decorative layer 3 and the like to be transferred are tightly integrated with the transfer object 6 side by the resin layer.

After the resin layer 7 is cured, the permeable sheet 2 is peeled off, so that the decoration layer 3 is transferred via the cured resin layer 7a.
(FIG. 3 (c)).

A resin layer such as a top coat layer 9 as shown in FIG. 3 (c) can be formed on the upper surface of the decorative layer 3 or the like transferred as described above, if necessary.

The ionizing radiation-curable resin constituting the resin layer 7 is mainly composed of a polymer, an oligomer, a monomer, or the like having a radically polymerizable double bond in the structure thereof, and may be a photopolymerization initiator, a sensitizer, or the like. Depending on the non-reactive polymer, containing organic solvents, wax and other additives, various grades are readily available from the market,
It can be used in the present invention. This resin layer 7 may be formed on the transfer object 6 side in advance as shown in FIG. 3A, or may be formed on the transfer sheet 1 side or both sides, although not particularly shown. The formation can be performed by applying a known coating means such as gravure coat, roll coat, flow coat or spray coat. The thickness of the resin layer 7 is
About 10 to 100 μm is preferable.

The transfer object 6 is not particularly limited, and is appropriately selected depending on the use and the like. Specific examples include, for example, stainless steel,
Metal plate or molded product such as copper plate coated with steel, aluminum, copper or vinyl chloride sol and gelled, glass, marble, ceramic, gypsum board, asbestos cement plate, calcium silicate plate, GRC (glass fiber reinforced cement) Such as inorganic plates or molded articles, polyester, melamine, polyvinyl chloride, organic polymer plates such as diallyl phthalate,
Examples include molded articles, woody boards such as wood, plywood, and particle board or molded articles. In addition, paper such as tissue paper, bleached kraft paper, titanium paper, return paper, paperboard, gypsum board paper, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyethylene terephthalate, polycarbonate,
Plastic films such as Nanron, polystyrene, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ionomer, and metal foils or sheets such as iron, aluminum, and copper, and composites composed of the above materials can also be used. . The transfer receiving member 6 may be subjected to a base treatment such as a filling treatment or a primer treatment, a treatment for improving the adhesiveness, or the like.

The transfer using the transfer sheet 1 of the present invention provided with the ionizing radiation shielding pattern layer 5 is performed in the steps shown in FIG.

That is, as shown in FIG. 3A, the transfer sheet 1 and the transfer-receiving body 6 are overlapped and adhered via the ionizing radiation-curable resin layer 7 in the same manner as described above, and thereafter, the ionizing radiation 8 is transferred to the transfer sheet. Irradiate from one side. By this irradiation, the ionizing radiation-curable resin layer 7 is hardened in a portion where the shielding pattern layer 5 is not provided, and the decorative layer and the like are tightly integrated with the transferred body 6 side. Leave uncured.

After irradiation with ionizing radiation, the transparent sheet 2 is peeled off as shown in FIG. As a result, in the cured resin layer portion, the decoration layer 3 and the like are transferred via the cured resin layer 7a.
Transferred to the side. In the uncured portion, the decorative layer 3 and the like are peeled and removed together with the uncured ionizing radiation-curable resin 7b on the transparent sheet 2 side. As a result, the surface of the transferred body 6 has a concave portion 11 in which a small amount of uncured ionizing radiation-curable resin 7b remains, and a convex portion having a decorative layer 3 and the like in close contact with the cured ionizing radiation-curable resin 7a, as shown in the figure. The surface has 12 irregularities.

Further, if necessary, after the transparent sheet 2 is peeled off, the uncured ionizing radiation-curable resin 7b remaining on the transfer object is removed by a known appropriate means to increase the depth of the concave portion. Can be.

After the transfer by the transfer sheet provided with the shielding pattern layer 5 is completed, the top coat layer 9 and the like are obstructed on the transferred decorative layer as shown in FIG. It can be formed without.

The transfer sheet of the present invention is, for example, a door face material, a floor tile,
Used for various purposes such as bathroom wall, general interior wall, kitchen backboard, etc.

Hereinafter, the present invention will be described in more detail with reference to specific examples.

Example 1 An onyx pattern was gravure-printed on a 38 μm-thick polyester film (Lumirror, manufactured by Toray Industries Inc.) using a urethane-based printing ink. Next, a transparent urethane-based ink was printed twice over the entire surface using a gravure plate having a plate depth of 80 μm twice to form a UV-curable resin penetration blocking layer having a thickness of about 10 μm to form a transfer sheet. .

Using the obtained transfer sheet, transfer was performed as follows. First, a 6 mm-thick siliceous plate is subjected to sealing treatment, and then a white urethane-based enamel paint is applied with a flow coater so as to have a thickness of about 30 μm, and a decorative plate substrate serving as a transfer object is formed. Got ready.

Next, a UV curable resin (manufactured by Nippon Paint Co., Ltd.) is coated on the transfer object so as to have a thickness of 100 μm,
The transfer sheet is overlapped on the coated surface so that the printed surface is in contact with the resin layer, and then six 80 W / cm non-ozone type ultraviolet lamps are irradiated so that irradiation from the transfer sheet side is performed. Ultraviolet irradiation was performed by passing through the installed ultraviolet irradiation line at a speed of 30 m / min (the irradiation conditions are the same as the irradiation conditions for standard curing of the ultraviolet curable resin).

After the resin was cured by ultraviolet irradiation, the polyester film of the transfer sheet was peeled off to transfer the onyx pattern printing layer. Further, the UV curable resin is applied to the transfer surface with a flow coater to a thickness of 60 μm, and the resin is cured by passing through the irradiation line under the same conditions to form a transparent top coat layer. To obtain a decorative board.

The decorative panel obtained is beautiful with a design appearance very similar to natural stone, and only the top coat layer of this decorative panel is used.
When cut into a 2 mm grid pattern and the surface (that is, the top coat layer) was subjected to a cellophane tape peeling test, no peeling of the surface layer or the like occurred at all, and it was confirmed that the top coat layer was well formed and adhered. I was able to confirm.

For comparison, a transfer sheet was prepared in the same manner except that the ultraviolet curable resin permeation blocking layer was not provided. After a decorative plate was prepared using the transfer sheet in the same manner as described above, the above cellophane tape peeling test was performed in the same manner.

Example 2 A wood pattern was gravure-printed on a 38 μm-thick polyester film (polyethylene terephthalate: Lumirror manufactured by Toray Industries Co., Ltd.) using a urethane-based printing ink, and then a portion corresponding to a wooden conduit was coated with ultraviolet rays containing titanium dioxide pigment. Gravure printing was performed with a shielding ink. Then, on top of it,
Use transparent urethane ink with 2 μm gravure plate
The entire surface was subjected to solid printing to form a UV-curable resin penetration blocking layer having a thickness of about 10 μm to prepare a transfer sheet.

Using the obtained transfer sheet, transfer was performed as follows. First, a 10mm thick veneer plywood is treated with a filler,
Thereafter, a white urethane-based enamel paint was applied by a flow coater so as to have a thickness of about 30 μm, thereby preparing a decorative board substrate to be a transfer object.

Next, an ultraviolet curable resin is applied to the transfer object in the same manner as in Example 1, and the transfer sheet is superimposed on the coated surface so that the printing surface is in contact with the resin layer surface. UV irradiation was performed under the same conditions.

After curing the resin other than immediately below the UV-shielding ink pattern layer by UV irradiation, the polyester film of the transfer sheet is peeled off, whereby the grain pattern printing layer is transferred to the plywood side, and at the same time, the shielding ink The uncured resin immediately below the pattern layer was adhered to and removed from the polyester film side, and a recess made of a conduit pattern was formed on the plywood side. Further, the remaining uncured resin was cured by passing through the irradiation line under the same conditions, and finally, wiping was performed with a black-brown urethane-based wiping ink, and the ink was filled in the concave portion of the conduit to obtain a decorative board. .

The obtained decorative board had a beautiful appearance that resembled the design of natural wood grain, and the concave portion of the conduit part was perfectly synchronized with the wood grain pattern. The wiping ink layer was also formed with good adhesion.

〔The invention's effect〕

As described above, since the transfer sheet of the present invention is provided with the ionizing radiation-curable resin permeation blocking layer as described above, when the transfer sheet is brought into close contact with the transfer target with the ionizing radiation-curable resin layer interposed at the time of transfer, It is possible to reliably prevent the uncured ionizing radiation-curable resin of the resin layer from permeating and seeping out to the surface side of the transfer layer (such as a decorative layer).

Therefore, if the transfer is performed by using the present invention, the cured resin layer does not exist on the surface of the transfer layer such as the decoration layer because there is no bleeding phenomenon of the uncured resin, and as a result, the transfer to the decoration layer after the transfer is completed. It becomes possible to form a top coat layer with good adhesion. Further, since the top coat layer is formed with good adhesion as in the conventional product, there is no need to adjust the irradiation intensity of ionizing radiation to be weak. In addition, there is no restriction such as concentration adjustment in the decoration layer or the like for transmitting weak ionizing radiation, so that the limit (upper limit) of the decoration layer concentration for securing the ionizing radiation transparency can be set higher than before. Is possible, and the design content can be diversified to be provided by the decorative layer. In addition, since the above-mentioned permeation barrier layer has transparency, there is no fear that the decorative layer or the like after the transfer will interfere with the design effect.

By providing the ionizing radiation shielding pattern layer in the transfer sheet of the present invention, a concavo-convex pattern can be imparted to the transferred object simultaneously with the design imparted by the decorative layer.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the transfer sheet of the present invention, FIGS. 2 and 4 are cross-sectional views showing another embodiment of the present invention, and FIG.
FIG. 5 is a cross-sectional explanatory view showing a transfer step using the transfer sheet illustrated in FIG. 1, and FIG. 5 is a cross-sectional explanatory view showing a transfer step using the transfer sheet illustrated in FIG. DESCRIPTION OF SYMBOLS 1 ... Transfer sheet 2 ... Ionizing radiation permeable sheet 3 ... Decorative layer 4 ... Ionizing radiation curable resin penetration blocking layer 5 ... Ionizing radiation shielding pattern layer 6 ... Transferred object 7 ... Ionizing radiation curable Resin layer

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-258090 (JP, A) JP-A-1-317798 (JP, A) JP-A-1-314198 (JP, A) JP-A-1- 253498 (JP, A) JP-A-1-214497 (JP, A) JP-A-1-186400 (JP, A) JP-A-1-171998 (JP, A) JP-A-1-166996 (JP, A) (58) Field surveyed (Int.Cl. ⁶ , DB name) B44C 1/165

Claims (2)

(57) [Claims] Claims: 1. An ionizing radiation-permeable sheet having a releasable surface, wherein at least a decorative layer is provided on a releasable surface of the sheet.
In a transfer sheet in which the decorative layer is transferred to an object to be transferred via an ionizing radiation-curable resin layer, a transparent ionizing radiation-curable resin permeation blocking layer having transparency is provided on the entire surface of the transparent sheet on which the decorative layer is formed. A transfer sheet. 2. The transfer sheet according to claim 1, wherein an ionizing radiation shielding pattern layer is provided on one or both sides of the ionizing radiation transmitting sheet.