JPH07434B2 - Transfer sheet having partial metal thin film layer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a transfer sheet in which a display portion having a metallic luster is formed by a partial metal thin film layer.

[Conventional technology]

Conventionally, as a transfer sheet having a partial metal thin film layer capable of surface transfer, a release layer, a pattern layer and a heat-resistant layer are formed on a sheet base material, and water-soluble removal is performed on a portion that does not require metallic luster display. After forming a layer, a metal thin film is formed on the entire surface, and only a portion of the metal thin film corresponding to the removal layer is removed together with the removal layer by washing with water to form a partial metal thin film layer. It is known that a heat-sensitive adhesive layer is formed on the partial metal thin film layer side.

[Problems to be solved by the invention]

However, when the transfer sheet is transferred at a high temperature, for example, in the transfer at a temperature of about 180 ° C. or higher, when the transfer sheet is transferred by heating and press-bonding the transfer sheet,
Since the ink of the pattern layer fluctuates due to the heat at the time of transfer and the heat-resistant layer is deformed, the partial metal thin film layer existing on the heat-resistant layer is distorted, and as a result, the partial metal thin film layer is fogged,
There is a problem that the metallic luster due to the layer is lost and specularity is impaired.

[Means for solving problems]

A transfer sheet having a partial metal thin film layer of the present invention is a heat-resistant sheet base material, a release layer formed on the base material, a heat-resistant layer formed on the release layer, and an upper portion. A metal thin film protective layer having acid resistance or alkali resistance, a partial metal thin film layer partially formed on the heat resistant layer corresponding to a display pattern, and a pattern layer printed on the heat resistant layer. The adhesive layer formed from the pattern layer side is sequentially laminated and formed.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 is a heat-resistant sheet substrate, 2 is a release layer provided on the sheet substrate 1, and 3 is a heat-resistant layer provided on the release layer. As the heat-resistant sheet substrate 1, polyester having a thickness of 10 to 75 μ,
A resin sheet such as nylon or drawn polypropylene can be used. The release layer 2 is provided to release the sheet base material 1 after transfer, and examples of the material thereof include acrylic resin, chlorinated rubber, and the like. If necessary, a release agent such as silicone or wax is added (added). The ratio can be 0.05 to 3%). A roll coater, a gravure coater or the like is used as a means for forming the peeling layer 2, and the thickness of the layer 2 is usually 0.3 to 5 μm, preferably 0.5 to 3 μm. Heat-resistant layer 3
Is provided to form a partial metal thin film layer to be described later, and examples of the material of the heat resistant layer 3 include urethane resin, epoxy resin, and the like, and if necessary, a fiber-based resin such as nitrocellulose, It is also possible to use a mixture of melamine-based resins and the like (mixing ratio of fiber-based resin, melamine-based resin and the like 1 to 50% by weight). Heat-resistant layer 3 is applied by roll coating, gravure coating, etc. (application amount 0.5-3
g / m ² ) formed, and the thickness of said layer 3 is 0.3-5 μ, preferably 0.5-3.

Next, as shown in FIG. 1, a metal thin film 4 made of a metal is provided over the heat-resistant layer 3. The metal forming the metal thin film 4 may be aluminum, chromium, copper or the like, but aluminum is preferable. As a method of forming the metal thin film 4, vacuum deposition, sputtering, an ion plating method or the like is used, and the thickness of the metal thin film 4 is 100 to 800.
Å, preferably 300-600 Å. A metal thin film protective layer 5 having acid resistance or alkali resistance is printed and formed on the portion on the metal thin film 4 where the metallic luster display is required. In forming the protective layer 5 by printing, a transparent ink having acid resistance or alkali resistance and adhesiveness to a metal thin film is used. Examples of the ink include vinyl chloride-vinyl acetate copolymer and nitrocellulose. , Urethane, saturated polyester, acrylic resin, etc. as a vehicle. Examples of the print forming method of the metal thin film protective layer 5 include a method of print forming in a roll shape using a printing means such as silk screen printing, offset screen printing, gravure printing, and the like, and the thickness of the protective layer 5 is It is preferably 0.5 to 5 μ.

The laminate sheet 6 (FIG. 1) as described above is immersed in an acid or alkali solution for etching. By this immersion, the metal thin film portion 4a of the metal thin film 4 on which the metal thin film protective layer 5 is not provided is removed.
4b remains, and as a result, the partial metal thin film layer 7 corresponding to the display pattern is formed (FIG. 2). As the acid solution used for the etching treatment, an aqueous solution of hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid or the like is used, and a concentration of 0.25 to 10 N is preferable.
As the alkaline solution, an aqueous solution of sodium hydroxide, ammonium hydroxide or the like is used, and a concentration of 0.1 to 10 N is preferable. After the completion of the immersion in the acid or alkaline solution, the acid or alkaline solution remaining on the laminate sheet 6 is neutralized, and then washed with water and dried.

The partial metal thin film layer 7 functions as a display unit having a metallic luster. For example, by the partial metal thin film layer 7, characters, figures,
It is possible to display symbols and the like.

Reference numeral 8 denotes a picture layer 8 such as printed characters, figures, symbols, and patterns. The layer 8 may be provided on the heat-resistant layer 3 in contact with the partial metal thin film layer 7 and the metal thin film protective layer 5. Alternatively, it may be provided on the heat-resistant layer 3 at a position apart from the partial metal thin film layer 7 and the metal thin film protective layer 5. The pattern layer 8 can also be provided on the partial metal thin film layer 7 via the metal thin film protective layer 5. In this way, the design effect can be improved by providing the pattern layer 8 on the partial metal thin film layer 7 or around it.

In printing the pattern layer 8, an ink having adhesiveness to the above ink used for printing the metal thin film protective layer 5 is used, and this ink includes acrylic resin, vinyl chloride-acetic acid. Examples of the vehicle include vinyl copolymers, polyesters, urethanes, nitrocellulose, chlorinated rubbers, vinyl chlorides, and the like, and preferably inks composed of an acrylic resin and a vinyl chloride-vinyl acetate copolymer. Examples of the print forming method of the pattern layer 8 include a method of printing and forming in a roll form using a printing means such as silk screen printing, offset screen printing, gravure printing, and the like, and the thickness of the layer 8 is preferably 0.5 to 5μ
Is.

As shown in FIG. 3, an adhesive layer 9 is formed on the pattern layer 8 side to obtain a transfer sheet 10 of the present invention. Adhesive layer 9 is a transfer sheet
It is provided for bonding when transferring 10 to the transfer target, and as the adhesive, a heat-sensitive ink is used, for example, acrylic resin, vinyl chloride-vinyl acetate copolymer, chlorinated rubber. Examples of the ink include vinyl chloride and the like. As the above-mentioned adhesive, one having a high adhesiveness to the transferred material can be appropriately used, but an adhesive having a low melting temperature is preferably used. As the means for forming the adhesive layer 9, roll coating, gravure coating, silk screen printing or the like is used.

In actually using the transfer sheet 10 of the present invention obtained as described above, the transfer sheet 10 is superposed on the transfer target 11 as shown in FIG.
Peel off. The sheet base material 1 is peeled off from the peeling layer 2, and the display portion formed by the partial metal thin film layer 7 and the printed characters, figures and the like are transferred to the transferred body 11.

According to the transfer sheet 10 of the present invention, not only the surface transfer in which the transfer is performed on the front surface side of the transfer target as in the transfer described above, but in the case of the transfer target made of a transparent substrate, the back surface of the transfer target is used. It can also be used for backside transfer in which transfer is performed to the side. In the back transfer, a transparent material is usually used as the transfer target 11,
In this case, the pattern layer overprinted on the metal thin film protective layer 5
8a, a pattern layer 8b formed in a contact shape around the partial metal thin film layer 7, and a pattern layer 8c provided apart from the partial metal thin film layer 7
Both appear in the appearance, and can be seen from the outside through the transferred body 11. In the surface transfer, as a transfer target, usually,
An opaque material is used. In this case, part of the picture layer 8b and the picture layer 8c can be seen from the outside, but the picture layer 8a is externally shielded by the partial metal thin film layer 7a and cannot be seen from the outside. In order to make the pattern layer 8a visible from the upper side in the surface transfer, another embodiment of the present invention can be constructed as shown in FIG.

In order to obtain the transfer sheet shown in FIG. 6, first, the partial metal thin film layer 7 is formed on the heat-resistant layer 3 by the same method as in the above embodiment.
To form. In this case, the partial metal thin film layer 7a on which the pattern layer 8 is to be formed by overprinting is formed in a shape having a void 12 as shown in FIG. After the partial metal thin film layer 7a is provided, the pattern layer 8 is printed and formed as a pattern layer 8d so as to fill the layer 7a portion, and then the adhesive layer 9 is formed.
Is provided to obtain a desired transfer sheet. When the surface transfer is performed on the transfer target 11 using the obtained transfer sheet (FIG. 6),
The pattern layer 8a can be seen from the outside as if it were located inside the partial metal thin film layer 7a.

Further, according to the present invention, when the pattern layer 8 is provided on the metal thin film protective layer 5 (pattern layer 8a) as shown in FIG. 3, the transfer sheet 11 made of a transparent material is used by using this transfer sheet. As shown in FIG. 7, when the back transfer is performed on the surface of the metal thin film protective layer 5, a concave portion is formed in the portion where the pattern layer 8a is provided and the peripheral portion thereof.
13. As a result, when viewed from the outside through the transferred material 11, a display portion having a three-dimensional appearance effect can be obtained by the pattern layer 8a and the metal thin film protective layer 5 having the recess 13.

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

Acrylic resin is roll-coated on a 25μ thick polyester film (S-10 manufactured by Toray) so that the thickness is 1μ, and then nitrocellulose is mixed with urethane (mixing ratio of nitrocellulose is 30% by weight). %) And apply it to a thickness of 1μ, then vacuum evaporate aluminum (thickness 400Å). After that, in a roll shape by silk screen printing with an ink made of vinyl chloride-vinyl acetate copolymer (Dainichi Seika: VM Pearl Ink) on the part on the aluminum deposition surface where the metallic luster display is required. Print to a thickness of 3μ.

The above laminated sheet is immersed in a sodium hydroxide aqueous solution (40 ° C) having a concentration of 0.25N for about 20 seconds, and then immersed in a hydrochloric acid solution (25 ° C) having a concentration of 0.25N to remove the remaining sodium hydroxide aqueous solution. Soak, then wash with water (10
The residual water content was dried and removed at 0 ° C. to form a partially vapor-deposited aluminum layer. Then, the desired pattern, etc., is rolled in a roll shape by silk screen printing with an ink using acrylic resin as a vehicle (Showa Ink: TASS ink) to a thickness of 5μ.
Then, the entire surface was coated with a heat-sensitive adhesive made of acrylic resin (HS32G, manufactured by Showa Ink Co., Ltd.) by roll coating to obtain a transfer sheet having a partially vapor-deposited aluminum layer.

Using the obtained transfer sheet, apply it to the surface of the acrylic transparent plate.
When thermal roll transfer was performed at a temperature of 190 ° C, the metallic luster due to the partially vapor-deposited aluminum layer was good,
The transfer sheet had excellent adhesion to the acrylic transparent plate.

〔The invention's effect〕

As described above, the transfer sheet having the partial metal thin film layer of the present invention is formed on the heat-resistant sheet base material, the release layer formed on the base material, and the release layer. A heat-resistant layer and a metal thin-film protective layer having acid resistance or alkali resistance on the upper part, and a partial metal thin-film layer partially formed on the heat-resistant layer corresponding to the display pattern and printed on the heat-resistant layer Since the formed picture layer and the adhesive layer formed from the picture layer side are sequentially laminated, the picture layer is present on the heat-resistant layer, and as a result, at a high temperature (about 180 ° C. or higher). Even when the transfer is performed by the method, the ink of the pattern layer does not change due to the heat at the time of transfer, and therefore, the heat resistant layer is not deformed and the partial metal thin film layer is not distorted. Therefore, according to the present invention, the partial metal thin film layer is not fogged, the metallic luster of the layer is not lost, and a good mirror surface property can be obtained.

[Brief description of drawings]

The drawings show one embodiment of the present invention, and FIGS. 1 and 2 are longitudinal sectional views showing a manufacturing process of the transfer sheet of the present invention. FIG. 3 is a longitudinal sectional view of the transfer sheet of the present invention. FIG. 5 is a vertical cross-sectional view showing a state in which transfer is performed using the transfer sheet of the present invention, FIG. 5 is a vertical cross-sectional view showing another manufacturing process of the transfer sheet of the present invention, and FIG. 6 shows the transfer sheet of the present invention in FIG. FIG. 7 is a longitudinal sectional view showing a state where transfer is performed by using the transfer sheet, and FIG. 1 ... Sheet substrate, 2 ... Release layer 3 ... Heat-resistant layer 5 ... Vapor-deposited metal protective layer 7 ... Partial vapor-deposited metal layer 8 ... Pattern layer, 9 ... Adhesive layer

Claims (1)

[Claims] 1. A heat-resistant sheet base material, a release layer formed on the base material, a heat-resistant layer formed on the release layer, and a metal thin film having acid resistance or alkali resistance on the upper portion. A partial metal thin film layer that has a protective layer and is partially formed on the heat-resistant layer corresponding to the display pattern, a pattern layer printed on the heat-resistant layer, and formed from the pattern layer side. A transfer sheet having a partial metal thin film layer, which is formed by sequentially laminating an adhesive layer.