JPH0310491B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a molded product having an embossed hologram on its surface and a method for manufacturing the same, and is applicable to POPs aiming at decorative effects, stationery, cosmetic containers, electrical equipment ( It can be used for cassette tape decks with radios, portable tape recorders, compact disk storage cases, nameplates, etc.), and various cards (ID cards, optical cards, etc.).

[Prior art and its problems]

Conventionally, it is known that a sheet with an embossed hologram is attached to the surface of a plastic molded product via an adhesive, and a transfer foil type hologram is post-transferred onto a plastic molded product using a hot stamp. Both methods have problems in terms of adhesion between the hologram and the molded product, and both have to be performed in a secondary process after the plastic molding process, which impairs mass production, which is the biggest advantage of plastic molded products. This poses a major obstacle to cost reduction.

[Means for solving problems]

The present invention is a molded product having a hologram and a method for manufacturing the same, which were conceived in view of the above points, and include an adhesive layer, a light reflection layer, and a resin having a hologram with an uneven pattern formed on the surface of the molded product body. It is a molded product having a hologram made of an embossed hologram material consisting of layers with the adhesive layer interposed therebetween, and in manufacturing it, a release agent layer is placed on one side of the base film, and an uneven pattern is formed on the surface. A transfer foil made by sequentially laminating a resin layer on which a hologram is formed, a light reflecting layer, and an adhesive layer is placed in an injection mold with the adhesive layer facing the resin side of the injection mold where the resin is injected. Fixed, molten resin is injected into the mold, the resin and the transfer foil are brought into close contact with each other via an adhesive layer to form a desired molded product, and simultaneously with or after mold release, The method is characterized in that the base film of the transfer foil on the surface of the molded product is peeled off via a release layer.

A detailed description will be given below based on the drawings.

First, as shown in FIG. 1, the transfer foil A used in the present invention includes a base film 1, a release agent layer 2, a resin layer 3,
A light reflecting layer 4 and an adhesive layer 5 are sequentially laminated,
As the base film 1, a film made of heat-resistant polyester resin, polyamide resin, cellophane, etc. can be used, but from the viewpoint of heat resistance, surface smoothness, stretchability, etc., polyester resin with a thickness of 10 to 50 μm is used. can be said to be the most suitable.

For the release agent layer 2, chlorinated rubber, chlorinated polyolefin, thermoplastic acrylic resin, cyclized rubber, etc. can be used, or two or more of these can be mixed to adjust the necessary release properties and adhesive properties. It is also possible. The release agent 2 can be applied to the base film 1 by means such as roll coating or a plate cord.

The resin layer 3 has an embossed hologram formed on its surface. In the present invention, a "hologram" or "embossed hologram" refers to a wavefront having three-dimensional information such as a three-dimensional object recorded as an unevenness (diffraction grating) on a resin surface, and specifically, the unevenness itself. This resin layer 3 has a thickness of 0.5 to 5μ and has excellent moldability by heating and pressurizing during embossing molding, and is made of a two-component curable urethane resin, especially acrylic polyol, as a main ingredient, and an isocyanate compound. A two-component hardening type urethane resin as a hardening agent is suitable, and after coating by means such as roll coating or blade coating, drying, and drying, the resin layer 3 and the hologram forming surface of the stamper plate are overlapped using a press machine. Combined, 90-160
℃ heating and then cooling, a hologram is formed on the surface of the resin layer 3.

The light reflecting layer 4 is a thin film of 100 to 10,000 Å made of a metal having a high surface reflectance, such as aluminum, gold, silver, tin, etc., by vacuum deposition, sputtering, ion plating, or the like.

The adhesive layer 5 is for adhering the light reflecting layer 4 of the transfer foil to the thermoplastic resin that is injected during molding, which is the object to be transferred. use For example, if the object to be transferred is made of polystyrene resin, use acrylic resin, vinyl chloride-vinyl acetate copolymer resin, etc. If the object to be transferred is made of polyolefin resin, use chlorinated polypropylene, ethylene monovinyl acetate copolymer resin, etc. Can be used.

Next, when molding and transferring the molded product, the second
As shown in the figure, a sheet-shaped transfer foil A with a predetermined shape
is fixed in the canister 9 with the surface of the adhesive layer 5 facing the gate 6 side of the mold 7, that is, the side in contact with the molten resin 10 to be injected, and then the mold 7 is closed.
Molten resin 10 is injected from gate 6 and cooled and solidified. Thereafter, the mold 7 is opened and the base film is peeled off when the molded product is taken out, thereby obtaining a molded product 8 having an embossed hologram forming material on the surface as shown in FIG.

Further, as shown in FIG. 4, the transfer foil A was opened with the surface of the adhesive layer 5 facing the gate 6 side of the mold 7', that is, the side facing the molten resin 10' to be injected. By inserting and placing the spot transfer foil A between the molds 7' and then closing the molds 7',
is clamped and fixed in the mold 7', molten resin 10' is injected, cooled and solidified, and then the mold 7' is opened and the base film A is peeled off when taking out the molded product.
Similarly, a molded article 8 having an embossed hologram on its surface as shown in FIG. 3 can be obtained.

Examples will be described below.

Example 1 Thickness on one side of a 38μ thick polyester film
After applying a two-component curable urethane resin based on chlorinated rubber with a thickness of 2μ and acrylic polyol with a thickness of 1.5μ using a roll coater, the urethane resin layer is embossed using a press to form a hologram on the surface. Ta.

Next, aluminum was vapor-deposited to a thickness of about 500 Å on the surface of the urethane resin layer on which the hologram was formed, and then an acrylic resin was applied thereon to a thickness of 2 μm using a roll coater to obtain a transfer foil.

Cut this transfer foil into sheets of any size,
Insert and fix the polyester film into the cavity of the injection mold with its side facing the cavity wall, close the mold, inject molten polystyrene resin (resin temperature 220℃), cool and solidify,
The mold was opened, the molded product was taken out, and the polyester film was peeled off to obtain a molded product having an embossed hologram on the surface. No change was observed in the hologram image before and after the transfer.

Example 2 A transfer foil having the same structure as in Example 1 was inserted between molds with the adhesive layer side facing the side in contact with the molten resin to be injected, and placed between the molds. The mold was closed and the transfer foil was clamped and fixed. Then, inject molten polyethylene (resin temperature 220℃),
After cooling and solidifying, the mold was opened and the polyester film of the transfer foil was peeled off when taking out the molded product, yielding a molded product having an embossed hologram on the surface similar to that of Example 1.

〔Effect of the invention〕

The hologram-containing molded product of the present invention has excellent adhesion because the hologram is bonded to the molded product at the same time as injection molding, and the hologram has sufficient wall thickness to give it a solid feel. It can be applied to the field of synthetic resin molded products.

In addition, by adopting the manufacturing method of the present invention, an embossed hologram can be easily formed on the surface of the molded product at the same time as injection molding, which is effective in improving mass productivity, processability, and economic efficiency compared to conventional methods. It is something that has.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a cross-sectional view showing the transfer paper according to the present invention, FIG. 2 is an explanatory diagram showing the steps of the manufacturing method according to the present invention, and FIG. A sectional view showing a molded article according to the invention, and FIG. 4 are explanatory diagrams showing another embodiment of the steps of the manufacturing method according to the invention. 1... Base film, 2... Release agent layer, 3...
resin layer, 4... light reflective layer, 5... adhesive layer, 6,
6'...Gate, 7,7'...Injection mold, 8
...Molded product, 9...Cavity, 10,10'...
...Melted resin.

Claims (1)

[Scope of Claims] 1. An embossed hologram forming material consisting of an adhesive layer, a light reflecting layer, and a resin layer on which a hologram with an uneven pattern is formed is provided on the surface of the molded product body via the adhesive layer. A molded product with a hologram. 2 Transfer foil is made by sequentially laminating a release agent layer, a resin layer with an uneven hologram on the surface, a light reflection layer, and an adhesive layer on one side of a base film, and the adhesive layer is made of injection molded metal. The mold is fixed in an injection mold so as to face the side of the resin to be injected, and molten resin is injected into the mold to bring the resin and the transfer foil into close contact with each other via an adhesive layer. A method for producing a molded article having a hologram, which comprises molding a desired molded article and peeling off a base film on the surface of the molded article via a release agent layer at the same time as or after demolding. 3. The hologram according to claim 2, wherein the transfer foil is inserted into and fixed to the inner wall of the cavity of the injection mold so that the adhesive layer faces the side of the injection mold where the resin is injected. A method for manufacturing a molded product having 4. By inserting the transfer foil between the open injection molds so that the adhesive layer faces the side of the injection mold where the resin is injected, and then closing the molds. A method for manufacturing a molded article having a hologram according to claim 2 or 3, characterized in that the transfer foil is fixed to a mold.