JPS63295300A - Transfer film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a transfer film that imparts an uneven pattern to the surface of a resin molded product when molded. , relates to a transfer film that is placed in a mold R and imparts an uneven pattern to the surface of a molded product.

[Prior art and its problems] Conventionally, in the injection molding method, as a means for imparting an uneven pattern to the surface of a molded product, it has been common to use a mold that has previously been provided with an uneven pattern.

However, if the uneven pattern is applied to the mold in advance as described above, a mold must be manufactured for each pattern, which not only increases the cost of the entire mold, but also makes the mold expensive. When a concavo-convex pattern is directly provided, it is difficult to provide the pattern on a curved surface, and it is impossible to create various variations using the same mold.

[Problems to be Solved] The purpose of the present invention is to inject a resin into a mold by an injection molding method to form a molded product, and at the same time to transfer an embossed pattern having a design onto the surface of the molded product. The goal is to provide film.

[Means for solving the problem] A concavo-convex pattern forming layer is provided on one side of a base material, and an adhesive layer is provided via a release layer. The problem was solved by using a resin with a high solids content to which sulfonic acid was added.

The explanation will be given below according to the drawings.

FIG. 1 shows an embodiment of the transfer sheet of the present invention, which is a transfer film in which an uneven pattern forming layer 2 is provided on one side of a base material 1, and an adhesive layer 4 is provided with a release layer 3 interposed therebetween. .

Further, as shown in FIG. 2, if a pattern layer 5 similar to the uneven pattern forming layer 2 is provided between the release layer 3 and the adhesive layer 4 shown in FIG. 1, the design will be improved. This results in a high configuration.

Here, as the base material 1, a polyester film with a thickness of 25 to 50 μm is preferable, and the uneven pattern forming layer 2 has a high solid content and has good adhesion to the polyester film. Added resins are preferred.

The release layer 3 is preferably made of acrylic or chlorinated rubber resin so that it does not come into close contact with the uneven pattern forming layer 2 during transfer and also serves as surface protection.
If even higher surface properties are required, an ultraviolet curable resin or an electron beam curable resin may be used.

Soshiso pattern N5 has good adhesion to the release layer and is an ink that uses vinyl chloride-based, vinyl chloride-vinyl acetate-based, acrylic, or urethane-based resin as a binder, and adhesive N4 is an ink that has good adhesion to the release layer and spreads well. Although it varies depending on the material, acrylic or ethylene-vinyl acetate copolymer resins are used, which exhibit stickiness when heated.

After the transfer, an ultraviolet curing resin may be used as the release layer 3 to strengthen the physical properties of the surface.

As the means for providing the uneven pattern forming layer, release layer, pattern layer and adhesive layer, gravure printing method, silk printing method,
Any printing method such as an offset printing method or a flexographic printing method can be used, and when it is provided on the front surface like a release layer or an adhesive layer, it can also be provided by a roll coating method or a reverse coating method.

[Operation] Place the transfer sheet in the mold for injection molding the molded product so that the adhesive layer faces the molded product side, and when injection molding is performed, the uneven pattern forming layer of the transfer film will have an opposite uneven pattern. can be formed on the surface of a molded product without deformation.

When a molded product is provided with a pattern as well as a pattern, the pattern layer and the pattern layer of the transfer sheet can be formed in synchronization.

[Example] An aminoalkyd resin (solid content 50%, addition amount of para-toluenesulfonic acid 5%) was applied to one side of a base material made of a polyester film having a thickness of 38μ at a depth of 20μ and 250 fI.
After printing and forming the gravure uneven pattern forming layer made of a parallel line screen, baking it at 180°C for 30 seconds and drying the acrylic resin on the hardened zero-order uneven pattern forming layer, the coating amount is approximately 30g. Form a peeled M layer so that /rrr,
Next, an adhesive layer made of acrylic resin was formed so that the coating amount after drying was about 1 g/rrf, and then dried to produce a transfer film.

[Effect] The uneven pattern forming layer of the present invention is a transfer sheet formed by a printing method, and is made of an aminoalkyd resin with para-toluene sulfonic acid added, so it can be placed in the injection mold. By molding in this state, it is possible to form an uneven pattern on the surface of the molded product that does not deform not only on the flat surface but also on the curved surface.

Furthermore, various patterns can be formed by simply changing the uneven pattern forming layer of the transfer film without being limited to one pattern. Furthermore, even when a pattern layer is added to the uneven pattern forming layer, it can be formed using a printing method with the correct position and accuracy, making it possible to produce molded products with excellent design.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing each embodiment of the present invention. l...Base material 2...Irregular pattern forming layer 3...Peelable layer 4...Adhesive layer 5.・・・・・・Picture layer

Claims (1)

[Claims] (1) A structure in which a concavo-convex pattern forming layer is provided on one side of the base material, and an adhesive layer is provided via a release layer, and the concave-convex pattern forming layer is
A transfer film characterized by consisting of a resin layer made by adding para-toluenesulfonic acid to an amino alkyd resin.