JPH0470339A - Transfer sheet and manufacture thereof - Google Patents

Abstract

PURPOSE:To smooth the surface of an adhesive layer even when a release layer has deep unevenness and to obtain a transfer sheet having the transfer layer well closely bonded to a transfer material by applying mirror surface press in either one of stages after the formation of a release material layer and a pattern printing layer or an adhesive layer in manufacturing. CONSTITUTION:A composition wherein resin beads are mixed with a curable resin is applied to transfer pasteboard to form a release layer 2 having deep unevenness on the surface thereof and a release material layer 3, a pattern layer 4 and an adhesive layer 5 are successively formed thereon. After the release material layer 3 is formed, mirror surface press is carried out in either one of stages to smooth the surface of the adhesive layer.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to improvements in a transfer sheet and a method for manufacturing the same. [Prior Art] Transfer sheets, which are preferably used for painting plastic molded products, are generally composed of a transfer mount, a release layer, a release material layer, a pattern printing layer, and an adhesive layer. ,
It can be manufactured by sequentially applying each layer by known coating or printing means. A simple means of making the surface of the transfer product uneven is to mix beads in the release layer. As a result, the surface of the release material layer that is in contact with this layer also has corresponding irregularities, and these irregularities are created on the surface of the transfer product. However, if the surface of the release layer is uneven, the second
As shown in the figure, the release material layer (3), pattern printing layer (4), and adhesive H (5) formed thereon all have surfaces that follow the irregularities. If the surface of the adhesive layer is not smooth, air will be trapped in the recesses of the adhesive layer during transfer, resulting in insufficient adhesion to the material to be transferred. For this reason, there is a limit to the depth of the unevenness that can be imparted to the surface of the release layer.

[Problem to be solved by the invention]

An object of the present invention is to provide a transfer sheet that has deep irregularities on its surface and can provide a transfer layer that is in good contact with a material to be transferred, and a method for manufacturing the same. [Means for Solving the Problems] As shown in FIG. 1, the transfer sheet of the present invention includes, on a transfer mount, a release layer containing resin beads and having deep unevenness on the surface, and a corresponding deep unevenness. a release material layer having on its surface,
A pattern printing layer and an adhesive layer are provided in this order, and the surface of the adhesive layer is smooth. The manufacturing method of the present invention for producing such a transfer sheet involves coating a transfer mount with a mixture of curable resin and resin beads to form a release layer with deep unevenness on the surface, and then applying a release layer on top of the release layer. It consists of sequentially forming a material layer, a pattern printing layer, and an adhesive layer, and is characterized in that mirror pressing is performed at any stage after the release material layer is formed. Mirror pressing is preferably carried out after the release material layer is formed and before the pattern printing layer is formed, whereby a transfer sheet as shown in FIG. 1 is obtained. In the drawings, (1) is a transfer mount, (2) is a release layer, and (7) is a transfer material. As the transfer mount, materials commonly used as mounts for transfer sheets may be used, including films made of polyester, polypropylene, polyethylene, etc., and papers coated with plastics such as polyolefin. Among them, biaxially stretched polyethylene terephthalate film is suitable because it is inexpensive and has excellent heat resistance and dimensional stability. The thickness of the transfer mount is generally 6 to 100 μm, preferably 12 to 60 μm, although it depends on the material and use. If necessary, the transfer mount is subjected to pretreatment such as primer treatment or corona treatment. The release layer may be formed by using various curable resins and by employing known coating and curing methods. Examples of curable resins suitable for use are urethane resins, epoxy resins, aminoalkyd resins, and melamine-urea polycondensates, each with the addition of isocyanates, polyamines, methyl ethyl ketone peroxide, or acid catalysts as curing agents. do. The thickness of the release layer depends on the size of the resin beads to be mixed, but generally it is sufficient if it is 25 μm or more. If it is too thick, it may not be easy to remove the mount after transfer, or
150. The molded product may not be able to be deformed according to its shape. It is preferable to keep it at around am. The bead-like material is appropriately selected from resin beads, glass beads, and the like. For example, beads made of urethane resin or acrylic resin are suitable because they have good dispersibility in the above mold release agent. The beads preferably have a particle size of 10 to 100 μm. If the thickness does not reach 10 μm, the unevenness is shallow;
If it exceeds 100 μm, uniform dispersion in the vehicle is difficult, and the release layer must be made thicker. The amount of beads mixed is generally 20 to 250 parts by weight, preferably 50 to 1 part by weight, per 100 parts by weight of the resin used for the release layer.
It is 50 parts by weight. The release material layer, the pattern printing layer, and the adhesive layer may be formed according to known techniques. However, thermoplastic resin should be used for the layer targeted for mirror pressing. For example, polyvinyl chloride, vinyl chloride/vinyl acetate copolymer,
Acrylic resins, styrene resins, ionomers, etc. are suitable. In the present invention, a pattern printing layer is not limited to a printing layer with a pattern or pattern, but also one that extends over the entire surface (such as a solid printing layer or a metal vapor deposited layer), and two-layered printing layers that have printing layers above and below a transparent intermediate layer. Including those consisting of layers. Mirror pressing is an operation to smooth the surface of any layer, and is performed by applying heat and pressure with a mirror plate or mirror roll. The temperature and pressure conditions for embossing are as follows:
It will be clear from the above description that the material should be selected depending on the physical properties of the material constituting the layer to be smoothed. [Function] During production, the transfer sheet of the present invention is manufactured so that the release layer has deep irregularities by performing mirror pressing at any stage after forming the release material layer, pattern printing layer, or adhesive layer. Also, the surface of the adhesive layer becomes a smooth transfer sheet.
In particular, if the pattern is printed on the release material layer before the pattern printing layer is formed, the pattern can be printed on a smooth surface and a delicate design can be obtained. [Example 1] Polyethylene terephthalate film with a thickness of 25 μm
"S Type" (manufactured by Diawheel) was subjected to corona discharge treatment and used as a transfer mount. Amino alkyd resin, butylated melamine resin and urethane resin beads (particle size 20-7oμTrL) were mixed into 9
: Dispersed in an organic solvent at a weight ratio of 1:5, and hydrochloric acid was added thereto as a catalyst. This mixture was roll coated onto the above transfer mount and placed in an atmosphere at a temperature of 120°C for 15 minutes.
By curing the coating film by holding it for a second, a release layer (average thickness 50 μTrL) with the unevenness of the resin on the surface is created.
was formed. On this release layer, a release material containing 1% by weight of wax and consisting mainly of an acrylic resin having a glass transition point of 85° C. was roll coated to a thickness of 15 μm. The surface of the release material layer was smoothed by pressing with a heated (120° C.) mirror-finished metal roll. On the release material layer, a pattern is gravure printed with acrylic resin ink rGGJ (manufactured by Showa Ink Kogyosho), and then acrylic resin adhesive rH3-32GJ (same) is applied to a thickness of 1.
A transfer sheet was obtained by gravure coating so that the thickness was .mu.m. This transfer sheet was stacked on a polystyrene board, pressed with a hot roll, and then the transfer mount was peeled off to produce a decorative board. When the adhesion of the transfer layer was tested by attaching cellophane tape to the decorative board and peeling it off, the transfer layer remained adhered to the polystyrene board. For comparison, a transfer sheet manufactured in the same manner as above was used, except that the process of pressing a mirror-finished metal roll onto the release material layer was not performed, and polystyrene was tentatively coated. As a result, part of the transfer layer adhered to the cellophane tape and was peeled off, leaving countless small holes in the pattern. ) was treated with corona discharge to make a transfer mount. Amino alkyd resin, butylated melamine resin and acrylic resin beads (particle size 20 to 60 μm) were mixed in a ratio of 9:1:
The mixture was dispersed in an organic solvent at a weight ratio of 4, and hydrochloric acid was added thereto as a catalyst. This mixture was roll-coated onto the above transfer mount, kept in an atmosphere at a temperature of 1° to 0°C for 20 seconds to harden the coating, and a release layer (average thickness of 4oμTr!,
) was formed. A release material mainly composed of an acrylic resin having a glass transition point of 100'C was roll coated onto the release layer to a thickness of 5 μm. Thereon, solid printing was performed using ink in which colored urethane resin beads (particle size 20 to 60 μTrL) were dispersed in an acrylic resin vehicle to form a 20 μm thick pattern printing layer. Next, acrylic resin adhesive rH3-32GJ
(manufactured by Showa Ink Industries) was roll coated to a thickness of 2 μm. As in Example 1, the surface of the adhesive layer was pressed with a mirror-finished metal roll to obtain a transfer sheet. Acrylic resin plates were painted using this transfer sheet and a transfer sheet that was laminated in the same manner as above but without being pressed onto the adhesive layer with a mirror-finished metal roll. An adhesion test was conducted on the two types of decorative boards obtained, and as in Example 1, the transfer layer and the base material remained adhered to the board painted with the transfer sheet produced by the manufacturing method of the present invention. The transfer sheet of the comparative example had countless small holes in the transfer layer. [Effects of the Invention] According to the method of the present invention, a transfer sheet that has a highly uneven surface that becomes the surface of the product after transfer, and a smooth surface of the adhesive layer that can be fully adhered to the transferred material. can be manufactured. Products painted with this transfer sheet have a unique design created by the combination of the pattern printing layer and the unevenness of the surface, and they also adhere perfectly to the transfer material and are durable. expensive.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view during transfer for explaining the transfer sheet of the present invention. FIG. 2 is a diagram similar to FIG. 1 for explaining a conventional transfer sheet. 1... Transfer mount 2... Release layer 3...
Release material layer 4... Pattern printing layer 5... Adhesive layer 7... Transfer material Patent applicant Dai Nippon Printing Co., Ltd. Agent Patent attorney Souo Suga

Claims (4)

[Claims] (1) A release layer containing beads and having deep unevenness on the surface, a release material layer having corresponding deep unevenness on the surface, a pattern printing layer, and an adhesive layer are sequentially provided on the transfer mount, A transfer sheet characterized in that the surface of the adhesive layer is smooth. (2) As a mold release layer, the particle size is 10 mm in thermosetting resin.
2. The transfer sheet according to claim 1, wherein a mixture of beads of polyurethane resin or acrylic resin having a diameter of 100 μm is used. (3) On the transfer mount, apply a mixture of curable resin and beads to form a release layer with deep unevenness on the surface, and on top of that, a release material layer, a pattern printing layer, and an adhesive layer. 1. A method for manufacturing a transfer sheet, which comprises sequentially forming a release material layer, and performing mirror pressing at some stage after forming a release material layer. (4) The manufacturing method according to claim 3, wherein a thermoplastic resin is used as the release material, and mirror pressing is performed at the stage of forming the layer.