JP3433332B2 - Transfer sheet - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer sheet for imparting smoothness and gloss to a transferred object after transfer. 2. Description of the Related Art Conventionally, in a molded product or the like used for a weak electric product, a cosmetic container, a building material member, or the like, a transfer sheet having a desired design in advance and a decorative layer is formed on the surface of the product. It is used as a means of transferring the decorative layer of the transfer sheet to easily improve the design of the product surface.
Conventionally, the transfer sheet is known to have a structure in which a transfer layer composed of a release layer, a decorative layer such as a pattern, an adhesive layer and the like is laminated on the surface of a release support sheet. However, in the conventional transfer sheet, when the transfer sheet is transferred to a product, the swelling of the decorative layer causes fine irregularities on the transfer surface, and the gloss is impaired. Therefore, in order to eliminate irregularities after the transfer, a transparent paint is applied to the transfer surface, or a press or the like is performed. [0003] However, when a transparent paint is applied or pressed on the transfer surface, the manufacturing process is disadvantageously increased. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the related art, and has as its object to provide a transfer sheet capable of providing a glossy transfer surface after a step of transferring the transfer sheet. [0004] The transfer sheet of the present invention is a decorative layer and an adhesive layer which are laminated on a support sheet as a transfer layer adjacent to a release layer, a resin layer for smoothing a transfer surface. In the transfer sheet having in this order, the position of the transfer surface smoothing resin layer is one of the following (a) to (c):
And glass metastasis point of the transfer surface smoothing resin layer (hereinafter referred to as Tg) of the release layer, a transfer sheet, characterized in that less than one decorative layer and the adhesive layer Tg. (A) support sheet / release layer / transfer surface smoothing resin layer /
Decoration layer / adhesive layer (b) support sheet / release layer / decoration layer / transfer surface smoothing resin layer / adhesive layer (c) support sheet / release layer / transfer surface smoothing resin layer /
Decorative layer / transfer surface smoothing resin layer / adhesive layer According to the present invention, by applying heat and pressure during transfer of a transfer sheet, the transfer surface smoothing resin layer Tg is obtained.
Is lower than the Tg of the decoration layer, the resin layer for smoothing the transfer surface absorbs the swelling of the decoration layer. In addition, since the Tg of the transfer surface smoothing resin layer is lower than the Tg of the adhesive layer, irregularities on the surface of the transfer object are absorbed. Therefore, no irregularities appear on the surface of the transfer surface smoothing resin layer, and a smooth and glossy transfer surface can be provided. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the transfer sheet of the present invention. As shown in FIG. 1, the transfer sheet 1 of the present invention has a release layer 3, a decoration layer 4, and a resin for smoothing a transfer surface on one side of a support sheet 2. This is a transfer sheet in which a layer 5 and an adhesive layer 6 are sequentially laminated. FIG. 2 shows an embodiment of the transfer sheet of the present invention. As shown in FIG. 2, the transfer sheet 1 of the present invention has a release layer 3, a transfer surface smoothing resin layer 5, and a decoration on one side of a support sheet 2. This is a transfer sheet in which a layer 4, a transfer surface smoothing resin layer 5, and an adhesive layer 6 are sequentially laminated. [0007] The support sheet 2 of the transfer sheet of the present invention is selected from those having smoothness. Examples thereof include polyolefin resins such as polyethylene, vinyl resins such as polyvinyl chloride, polyester resins such as polyethylene terephthalate, and polymethacrylic acid. Examples include resin films or sheets of acrylic resin such as methyl, cellulose resin, polycarbonate and the like. The thickness of the support sheet is 12 μm to 200 μm
m, and preferably 25 μm to 100 μm. 2
When the thickness is 5 μm or less, the sheet is likely to be cut during the transfer, and the unevenness of the transfer roll and the unevenness of the picture are likely to appear on the transfer surface. If it is 100 μm or more, the cost increases and the low-temperature transferability also decreases. The release layer 3 of the transfer sheet of the present invention is a layer which facilitates the releasability from the support sheet 2 and can be a surface protective layer after the transfer, and its resin composition is a desired one for the surface protective layer after the transfer. Select to have physical properties. Examples of the resin forming the release layer include an acrylic resin, a vinyl chloride resin, a polyester resin, and a cellulose resin. A lubricant or the like can be added to the release layer in order to impart surface properties, mechanical suitability, and the like. Further, a release layer may be provided on the support sheet in order to optimize the releasability from the support sheet. In particular, when the surface requires scratch resistance, chemical resistance, and stain resistance, a thermosetting resin or an ionizing radiation-curable resin is used. The Tg of the release layer is preferably 100 ° C. or higher. When the Tg is 100 ° C. or lower, the surface is soft and easily scratched after the transfer. Further, it is preferable that the Tg of the release layer is the highest among the respective layers of the transfer sheet. The release layer is laminated by a gravure roll coating method or the like.
The thickness of the release layer is preferably 0.5 to 6 μm. The decorative layer 4 of the transfer sheet of the present invention has a thickness of μm by printing a pattern, such as a pattern or a figure, a symbol, a character, or a colored layer, which is a copy of a natural product, by a printing method such as a gravure method, a screen method, and an offset method. What is necessary is just what was formed in. As the ink for forming the decorative layer, for example, a vehicle composed of a thermoplastic resin, a thermosetting resin, an ionizing radiation-curable resin, a pigment, a coloring material such as a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst Are appropriately mixed. Preferably, an ink using the same resin as the release ink as a vehicle is used. The Tg of the decorative layer is preferably about 50C to 100C.
When the temperature is 50 ° C. or lower, the ink forming the decorative layer easily flows due to heat at the time of transfer, and when the temperature is 100 ° C. or higher, plasticity is lost and cracks are easily generated. The decoration layer is
Lamination is performed by a printing method such as a gravure method, a screen method, and an offset method. The preferred thickness of the decorative layer is 0.5 to 6 μm
It is. The transfer surface smoothing resin layer 5 of the transfer sheet of the present invention is a layer for preventing irregularities on the transfer surface, and is made of, for example, polyester resin, vinyl chloride resin, vinyl acetate resin, acrylic resin, cellulose resin and the like. Select a decoration layer having a lower Tg. Also, in consideration of the preferred embodiments of the release layer and the adhesive layer as described above and below, the Tg of the transfer surface smoothing resin layer is set lower than the Tg of the decorative layer, the release layer, and the adhesive layer. In addition, it is sufficient that the adhesive layer has appropriate adhesion to the release layer and the decorative layer. If necessary, the transfer surface smoothing resin layer may be colored by adding a raw material or a dye. In addition, by using a thermosetting resin or an ionizing radiation-curable resin for the transfer surface smoothing resin layer, it is possible to absorb minute irregularities of the decoration layer at a low melting point during transfer, so that the surface is excellent in smoothness. A transcript is obtained. Furthermore, by curing after transfer, it is also possible to improve adhesion and physical properties. The transfer surface smoothing resin layer is laminated by a printing method such as a gravure method, a screen method, and an offset method. The thickness of the transfer surface smoothing resin layer is 0.5 to 6 μm, and preferably 1 to 3 μm.
When it is 0.5 μm or less, the effect of smoothing the transfer surface is small, and when it is 6 μm or more, there is an effect of smoothing the transfer surface, but the cost increases. The adhesive layer 6 of the transfer sheet of the present invention is provided in order to bring the transfer layer into close contact with a molded article or the like, and the material is the same as the material of the adhesive layer usually used for this type of transfer sheet. Similar ones can be used. Examples of the resin forming the adhesive layer include an acrylic resin, a vinyl chloride-vinyl acetate copolymer, a rubber resin, and a urethane resin. The Tg of the adhesive layer is preferably from 50 to 100C. When the temperature is lower than 50 ° C., blocking occurs. When the temperature is higher than 100 ° C., sufficient adhesiveness to the transfer receiving body cannot be obtained due to heat during transfer. The adhesive layer is laminated by a printing method such as a gravure method, a roll coat, and a bar coat. The present invention will be described in detail with reference to the following specific examples. Example 1 A 25 μm-thick polyester film (Lumirror F65, manufactured by Toray Industries, Inc.) was used as a support sheet 2, and a release layer 3 made of an acrylic resin was applied on the surface of the support sheet (Hakuri 46-7, manufactured by Showa Ink Industries, Ltd.). Tg = 105 ° C.)
Gravure printing, and a decorative layer 4 made of acrylic resin (manufactured by Showa Ink Industries: BC heat-resistant, T
g = 70 ° C.) by gravure printing to a thickness of 2 μm, and a transfer layer smoothing resin layer 5 (BC-72 medium, Tg = 50 ° C.) made of acrylic resin on the surface of the decoration layer by gravure printing to a thickness of 2 μm. An adhesive layer 6 made of a vinyl chloride / vinyl acetate copolymer is formed on the surface of the transfer surface smoothing resin layer.
(Showa Ink Industries, Ltd .: PVHS, Tg = 70 ° C)
The transfer sheet 1 of the present invention was obtained by gravure printing to a thickness of μm. The transfer sheet was transferred to an acrylic plate as the transfer substrate 7 by a roll transfer machine at a silicon roll temperature of 200 ° C., a pressure of 10 kg / cm 2 and a speed of 3 m / min. The transfer surface became smooth and high gloss. Example 2 A resin layer 5 for smoothing a transfer surface was formed on the surface of the release layer 3 of Example 1.
A transfer sheet 1 was prepared in the same manner as in Example 1 except that (BC-72 medium, Tg = 50 ° C.) was laminated by gravure printing, and transferred to an acrylic plate as the transfer base material 7 as in Example 1. Was. The transfer surface became smooth and high gloss. Comparative Example 1 A transfer sheet was prepared in the same manner as in Example 1 except that the transfer surface smoothing resin layer 5 of Example 1 was not provided, and transferred to an acrylic plate as the transfer base material 7 in the same manner as in Example 1. Was. The transfer surface was slightly lacking in smoothness and gloss as compared with Examples 1 and 2. Further, the surface roughness Ra of the transfer surface obtained by transferring the transfer sheet obtained from the example of the present invention and the transfer sheet obtained from the comparative example to an acrylic plate as described above was measured, and the results shown in the following table were obtained. I got The surface roughness Ra is in accordance with JIS B0601-1982, and the measuring machine is a surf coder SE- manufactured by Kosaka Laboratory Co., Ltd.
30K was used. [Table 1] As described above, the transfer sheet of the present invention can be used as a transfer layer on a support sheet as a release layer, a decorative layer laminated adjacent to a transfer surface smoothing resin layer, and an adhesive. And the transfer layer having the order of (a) to (c), and the Tg of the transfer layer smoothing resin layer is determined to be a release layer. By adopting a configuration lower than the Tg of any of the decorative layer and the adhesive layer, compared with the conventional transfer sheet having no transfer layer smoothing resin layer laminated thereon, the pattern layer is raised at the time of transfer, and the transferred image is transferred. It can absorb irregularities on the body surface and impart gloss and smoothness to the transfer surface. (A) support sheet / release layer / transfer layer smoothing resin layer /
Decoration layer / adhesive layer (b) support sheet / release layer / decoration layer / transfer layer smoothing resin layer / adhesive layer (c) support sheet / release layer / transfer layer smoothing resin layer /
Decorative layer / Transfer surface layer Smoothing resin layer / Adhesive layer

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an example of the transfer sheet of the present invention. FIG. 2 is a longitudinal sectional view showing one example of the transfer sheet of the present invention. FIG. 3 is an explanatory diagram when transferring is performed using the transfer sheet of the present invention. [Description of Signs] 1 transfer sheet 11 transfer layer 2 support sheet 3 release layer 4 decoration layer 5 transfer surface smoothing resin layer 6 adhesive layer 7 transfer substrate

Claims (1)

(57) [Claim 1] A release layer, a decorative layer and an adhesive layer laminated adjacent to a transfer surface smoothing resin layer as a transfer layer on a support sheet are arranged in this order. Transfer sheet having
The position of the transfer surface smoothing resin layer is determined by the following (a) to
Is either (c), the transfer sheet and the glass metastasis point of the transfer surface smoothing resin layer, a release layer, characterized in that below the decorative layer and the adhesive layer either glass metastasis point; (A) support sheet / release layer / transfer surface smoothing resin layer /
Decoration layer / adhesive layer (b) support sheet / release layer / decoration layer / transfer surface smoothing resin layer / adhesive layer (c) support sheet / release layer / transfer surface smoothing resin layer /
Decorative layer / transfer surface smoothing resin layer / adhesive layer