JPH058597A - Transfer foil - Google Patents

Abstract

PURPOSE:To specify the resin composition of release varnish, and to prevent the defective adhesion of overcoat varnish and the generation of cracks in a transfer foil for designing a plastic molding, in which release varnish, a design layer and adhesive varnish are mounted successively on one surface of a base material sheet. CONSTITUTION:In a transfer foil, in which release varnish 2, design layers 3 and an adhesive layer 4 are set up successively on one surface of a base material sheet 1 composed of a polyester film, release varnish 2 is produced by adding acryl polyol, isocyanate, amine, a polymer having a carboxyl group, and these two kinds or more of mixtures to a 80wt.% acrylic resin in a 100wt.% resin component in release varnish at 20wt.% respectively, and prepared by baking at low temperature (approximately 150 deg.C) in thickness of 1.5mum. A mold release layer 5 consisting of an epoxy-melamine or amine-alkyd thermo-setting and acid-setting resin is formed between the base material sheet 1 and release varnish 2 as required.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention transfers a pattern layer using a transfer foil to transfer a pattern of wood grain to the surface of a plastic molded product in order to obtain daily miscellaneous goods such as a lacquer tray and tray. In order to express such a feeling, the present invention relates to this transfer foil in a method of applying a urethane paint on it.

[0002]

2. Description of the Related Art Conventionally, as a transfer foil for obtaining the daily sundries having the lacquer tone, a pattern layer is formed on a substrate made of a polyester resin film or the like via a release varnish, and an adhesive layer is formed on the pattern layer. Was used. As the peeling varnish for the transfer foil, a varnish containing an acrylic resin as a main component is often used because it has good transferability and resistance.

[0003]

However, since the above-mentioned conventional transfer foil has improved surface resistance and looks like a lacquered product, if urethane coating is overcoated after the transfer, the acrylic resin of the release varnish becomes Since the compatibility with the alkyd urethane resin, which is the main component of the most commonly used urethane paint, is poor, there are problems such as poor adhesion of the overcoat layer and cracks in the overcoat layer.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve the drawbacks of the prior art as described above, and a release varnish, a pattern layer, and an adhesive layer are sequentially formed on one surface of a base sheet made of a polyester film or the like. In the transfer foil provided with varnish,
As the resin composition of the peeling varnish, a transfer foil used in a plastic molded article, characterized in that an acrylic resin, an acrylic polyol, an isocyanate, an amine, a polymer having a carboxyl group, or a mixture thereof is used. Furthermore, the present invention provides a transfer foil characterized in that a release layer made of an epoxy / melamine-based or amine / alkyd-based thermosetting or acid-curing resin is provided between the base sheet and the release varnish. is there.

[0005]

[Function] Using the transfer foil of the present invention, a polystyrene resin,
A pattern is transferred to a plastic molded product such as ABS resin, and an alkyd / urethane-based or acrylic isocyanate urethane-based resin is applied on the pattern layer with an overcoat varnish. There is no problem in that the adhesiveness of the overcoat varnish layer, which is a defect in the conventional transfer foil, and the cracks in the overcoat varnish layer are generated, and the epoxy melamine is interposed between the base sheet and the release varnish. By providing a release layer consisting of a thermosetting or acid-curing resin of amine type or amine alkyd type,
It became possible to obtain stable peelability.

[0006]

The present invention will be described in detail below with reference to specific examples. FIG. 1 is a cross-sectional explanatory view showing one embodiment of the transfer foil A of the present invention, in which a release varnish 2, a pattern layer 3 and an adhesive layer 4 are sequentially provided on one surface of a base material sheet 1 made of a polyester film. Is.

Next, specific examples of each of the above layers will be described. As the base material sheet 1, a polyester film can be used, and a film having a thickness of 12 to 50 μm is preferably used.

As the peeling varnish 2, the resin component 1 in the peeling varnish is taken into consideration in consideration of adhesion with the over varnish after transfer.
Acrylic resin 80% by weight in 00% by weight,
Acrylic polyol, isocyanate, amine, a polymer having a carboxyl group, and a mixture of two or more kinds thereof are added in an amount of 20% by weight, and the thickness is 1.5 μm and the baking is performed at a low temperature (150 ° C.).

The pattern layer 3 is formed by using an ink containing urethane-based, acrylic-based, vinyl-based, or rubber-based resin in consideration of heat resistance during transfer. As the adhesive layer, an acrylic, vinyl chloride, styrene, or urethane adhesive varnish having a thickness of 1.8 μm is provided.

Using the transfer foil A having the above structure, the surface of the tray-shaped molded product using polystyrene resin, ABS resin, polyacetal resin or the like as the resin of the molded product contains an alkyd urethane type resin or an acrylic isocyanate urethane type resin. Transfer processing was performed on the surface coated with varnish, the pattern layer was transferred to a molded product, and an alkyd urethane type or acrylic isocyanate urethane type resin was applied as an overcoat varnish on the pattern layer. , Urethane bond (when the additive is acrylic polyol or isocyanate), urea bond (when the additive is amine), and amide bond (when the additive is a polymer having a carboxyl group) are formed, respectively, and adhesion to the release layer It was possible to obtain a lacquer-like painted article with a good appearance.

In the above example, the reaction was carried out at 60 ° C., 1
Achieved by drying over time. Further, in the above-mentioned examples, the additive acrylic polyol, the isocyanate, the amine, the polymer having a carboxyl group, and the mixture of two or more of them are both added in an amount of 5 to 50%.
This is because if it is 5% or less, a sufficient chemical reaction cannot be expected, and if it is 50% or more, the transferability is deteriorated because the adhesion between the base film and the release layer is increased.

The transfer foil B of another embodiment of the present invention will be described with reference to the sectional view of FIG. In the transfer foil B of this example, a release layer 5, a release varnish 2, a pattern layer 3 and an adhesive layer 4 were sequentially provided on one surface of a base material sheet 1 made of a polyester film. As the mold layer 5, a thermosetting resin of epoxy / melamine type or amino / alkyd type is used.

The release layer 5 is formed on the base sheet by 120 to 15
It is formed by baking coating under conditions of 0 ° C. for 10 to 15 seconds, and a suitable thickness is 1 μm.

When this transfer foil was used to paint on a plastic molded product in the same manner as the transfer foil of the first embodiment, after 20 days (4
Transfer failure occurred at 0 ° storage), but transfer foil using the release layer 5 does not cause transfer failure even after 30 days (storage at 40 ° C), and stable peeling property is obtained even with the lapse of time. Was possible. That is, since the release layer 5 is a thermosetting resin and an acid curing resin, bonding due to a chemical change after curing is extremely rare.

[0015]

[Effects] The present invention has the above-mentioned constitution, and as the resin composition of the release varnish, acrylic resin, acrylic polyol,
By using an isocyanate, an amine, a polymer having a carboxyl group, or a mixture thereof, the additive added to the release varnish and the additive added to the overcoat varnish form a chemical bond, It is possible to prevent poor adhesion of the overcoat varnish and cracks in the overcoat varnish.In addition, a release layer made of epoxy / melamine-based or amine / alkyd-based thermosetting or acid-curing resin is provided between the base sheet and the release layer. By providing it, it was possible to obtain a stable peeling property even with a change over time.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a transfer foil according to an example of the present invention.

FIG. 2 is a cross-sectional explanatory view of a transfer foil according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Base material sheet 2 ... Peeling varnish 3 ... Design layer 4 ... Adhesive layer 5: Release layer

Claims (2)

[Claims] 1. A transfer foil for painting on a plastic molded product in which a release varnish, a pattern layer, and an adhesive varnish are sequentially provided on one surface of a base sheet, and the release varnish has a resin composition of acrylic resin and acrylic polyol. A transfer foil for use in a plastic molded article, which is obtained by adding an isocyanate, an amine, a polymer having a carboxyl group, or a mixture thereof. 2. A release layer made of an epoxy-melamine-based or amine-alkyd-based thermosetting or acid-curing resin is provided between the base sheet and the release varnish. Transfer foil according to the item.