JP2003326591A - Formed product of decorative sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a formed product of a decorative sheet decorated with a solvent-free colored ink. <P>SOLUTION: This formed product of a decorative sheet is characterized in that, after decoration with an ultraviolet-curable colored ink, shaping is carried out by vacuum forming or pressure forming. Regarding the ultraviolet- curable colored ink, preferably, a 100 μm-thick film formed by subjecting a vehicle constituting the colored ink to ultraviolet curing and forming has a breaking strength of not less than 1.0 kg/cm and an elongation at break of not less than 130% as measured at 25°C. The use of a sheet decorated with the ultraviolet-curable colored ink is advantageous in that, even when a part of the decorative sheet should be subjected to deep drawing, the colored ink layer in close contact with the sheet in its rising part is neither separated nor cracked. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet molded product decorated with an ultraviolet curable coloring ink.

[0002]

2. Description of the Related Art Conventionally, an insert molding method has been widely used as a method for producing a decorated plastic resin molded article.

In this insert molding method, as a first step, a flat plastic resin sheet is first printed on one side or both sides thereof, and a single-layer or multi-layer coloring ink adhered to the sheet is provided to form a decorative sheet. To make. Next, as the second step, the decorative sheet obtained in the first step is heated to be softened, and drawn by vacuum forming or pressure forming to obtain a decorative surface of a desired plastic resin molded product. It is formed into a shape and a formed decorative sheet is produced.

Furthermore, in the third step, the molded decorative sheet obtained in the second step is inserted into the mold of the injection molding machine and the mold is closed, and then the cylinder of the injection molding machine is used. The molten plastic resin is injected into the mold to produce a molded product in which the injected plastic resin and the decorative sheet are integrated.

[0005]

However, in the second step of insert molding described above,
Since a deep drawing process as shown in FIG. 3 is often performed, the sheet 10 shown in FIG. 3 between a and a ', especially its rising portion, is heated and drawn several times. The colored ink layer adhered to the sheet 10 should not be peeled or cracked during the heating and stretching.

As an ink satisfying this condition, for example, a heat resistant ink as described in Japanese Patent No. 2997636 has been proposed. However, such an ink is a special resin dissolved in a solvent, and it is necessary to dry and remove the solvent for printing. Therefore, not only a long drying time and heating energy are required, but also air pollution due to the solvent is generated, which is not preferable. This drawback becomes particularly remarkable when the decoration is performed with a multi-layered coloring ink.

Therefore, an object of the present invention is to provide a decorative sheet molded product decorated with a solvent-free colored ink.

[0008]

In order to solve the above-mentioned problems, the present invention provides a method in which after being decorated with an ultraviolet curable coloring ink,
It is intended to provide a decorative sheet molded article characterized by being molded by vacuum molding or pressure molding. here,
In the ultraviolet-curable colored ink, a film having a thickness of 100 μm formed by ultraviolet-curing a vehicle constituting the colored ink has a breaking strength of 1.0 kg / cm or more and a breaking elongation of 130% or more at 25 ° C. It is preferable.

More preferably, the urethane (meth) acrylate as the photopolymerization-reactive oligomer and the heterocyclic monofunctional monomer or the cyclic monofunctional monomer as the photopolymerization-reactive monomer are contained as essential components in the heat resistance of the coloring ink. It is good for improving the elongation and elongation properties. Polycarbonate urethane (meth) acrylate, which is made by reacting non-yellowing type polycarbonate diol with isocyanate as a photopolymerization reactive oligomer, and non-yellowing type polyether diol with isocyanate are reacted. Polyether urethane (meth) acrylate, polyester-based urethane (meth) acrylate produced by reacting non-yellowing type polyester diol with isocyanate, or a mixture thereof, and a heterocyclic monomer as a photopolymerization-reactive monomer. To contain potential monomer or cyclic monofunctional monomer as an essential component, in order to improve the thermal yellowing resistance of the colored inks are preferred.

By using a sheet decorated with such an ultraviolet curable coloring ink, even if a part of the decorative sheet needs to be deep drawn, it is in close contact with the sheet at the rising portion thereof. The colored ink layer does not peel or crack.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an insert molding molded product 1 according to the present embodiment includes a decorative sheet 2 according to the present embodiment,
It is composed of the resin 3 molded on the back surface of the decorative sheet 2. The decorative sheet 2 is formed by applying a colored ink layer 5 to the back surface of a heat-resistant transparent sheet 4 such as a transparent polycarbonate or polyester sheet.

The colored ink layer 5 is a film having a thickness of 100 μm formed by ultraviolet-curing a vehicle that constitutes an ultraviolet-curable colored ink, and has a thickness of 1.0 kg at 25 ° C.
It has a breaking strength of not less than / cm and a breaking elongation of not less than 130%, and is prepared by printing the following three types of prescriptions and irradiating with ultraviolet rays to cure.

[0013]   Prescription example 1;     Epoxy acrylate oligomer; 10% by weight     Polyester acrylate oligomer; 10% by weight     Non-yellowing polyester urethane acrylate oligomer; 15% by weight     Acroylmorpholine: 10% by weight     N-vinylcaprolactam; 5% by weight     Phenoxydiethylene glycol acrylate; 10% by weight     Tripropylene glycol diacrylate; 5% by weight     Phosphine oxide photopolymerization initiator; 6% by weight     Carbon black pigment; 2% by weight     Titanium oxide pigment; 25% by weight     Silicone defoamer: 2% by weight

[0014]   Prescription example 2;     Yellowing type polyester urethane acrylate oligomer; 30% by weight     Acroylmorpholine; 10% by weight     N-vinylcaprolactam; 10% by weight     Phenoxydiethyl acrylate; 10% by weight     2-ethylhexyl acrylate; 5% by weight     Phosphine oxide photopolymerization initiator; 6% by weight     Carbon black pigment; 2% by weight     Titanium oxide pigment; 25% by weight     Silicone defoamer: 2% by weight

[0015]   Prescription example 3;     Yellowing type polyester urethane acrylate oligomer; 15% by weight     Yellowing type polycarbonate-based urethane acrylate oligomer; 15% by weight     Acroylmorpholine; 10% by weight     N-vinylcaprolactam; 10% by weight     Phenoxydiethyl acrylate; 5% by weight     Cyclopentanyl acrylate; 10% by weight     Phosphine oxide photopolymerization initiator; 6% by weight     Carbon black pigment; 2% by weight     Titanium oxide pigment; 25% by weight     Silicone defoamer: 2% by weight

The insert molding 1 is
It is manufactured by a manufacturing method including the following steps. That is, using the coloring ink, on the back surface of the transparent sheet 4,
Offset printing, gravure printing, or screen printing is performed. As a result, the decorative sheet 2 in which the colored ink layer 5 is formed on the back surface of the transparent sheet 4 is manufactured.

Next, as shown in FIG. 2, the decorative sheet 2 having the colored ink layer 5 formed on the back side is vacuum-formed, pressure-formed, or the like to have a ring-shaped convex portion 2a at the center. Create a shape. As shown in the figure, the decorative sheet 2 has a circular shape with a diameter of 85 mm, and the convex portion 2a has an outer peripheral diameter of 65 mm and an inner peripheral diameter of 40 m.
m, the outer height is 5 mm, the inner height is 10 mm, and the surface curvature is R = 30 mm.

At this time, the shaped decorative sheet 2 was visually observed, but no peeling or cracking occurred in the colored ink layer 5 adhered to the transparent sheet 4 at the rising portion of the convex portion 2a. .

Next, the shaped decorative sheet 2 is set in a mold so that the side having the colored ink layer 5 faces inward.
Then, the synthetic resin which was melted by heat is injected into the mold,
After the resin 3 is cured, the mold is opened. The heat-melted synthetic resin used in this example is an ABS resin. As a result, as shown in FIG. 1, the ring-shaped protrusion 2 is formed at the center.
The molding of the insert molding 1 having a is completed. When this insert molding molded product 1 was observed from the outside, there was no part where the colored ink layer 5 was peeled or cracked. Therefore, it was found that when the molten resin was injected into the shaped decorative sheet 2 on the side of the colored ink layer 5, the flowing molten resin did not damage the colored ink layer 5 provided on the decorative sheet 2. .

The above results are summarized in Table 1.

[Table 1]

In this embodiment, the insert molding molded product 1 has the ring-shaped convex portion 2a in the center, but the present invention is not limited to this. Of course, the present invention can be applied to a flat resin molded product.

Also, in this embodiment, the transparent sheet 4
Although the single color ink layer 5 is applied to only one side of the above, a plurality of color ink layers 5 may be applied, or the color ink layer 5 may be applied to both sides of the transparent sheet 4.

[0023]

As described above, according to the present invention, it is possible to provide a decorative sheet molding which can be decorated without containing a solvent. In addition, it can be decorated without containing a solvent,
Decorative sheet molding with printing that does not cause peeling or cracks in the colored ink layer even if subjected to deep drawing, and that the colored ink layer provided on the decorative sheet is not damaged by the flowing molten resin You can provide things.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a shaped decorative sheet of the example and its molding dimensions.

FIG. 3 is a cross-sectional view of a decorative sheet for pointing out the problem of the present invention.

[Explanation of symbols]

1 Insert molding products 2 decorative sheet 2a convex part 3 resin 4 transparent sheet 5 Colored ink layer

Claims (4)

[Claims] 1. A decorative sheet molded article, which is shaped by vacuum molding or pressure molding after being decorated with an ultraviolet curable coloring ink. 2. A film having a thickness of 100 μm formed by subjecting the vehicle constituting the coloring ink to ultraviolet curing to form a film having a thickness of 100 μm at 25 ° C. of 1.0 kg / cm 2.
The decorative sheet molded product according to claim 1, which has the above breaking strength and a breaking elongation of 130% or more. 3. The ultraviolet curable color ink contains urethane (meth) acrylate as an oligomer, and a heterocyclic monofunctional monomer or a cyclic monofunctional monomer as an essential component as an essential component. The decorative sheet molding described. 4. The urethane-based (meth) acrylate monomer is any one of a polycarbonate-based urethane (meth) acrylate, a polyester-based urethane (meth) acrylate, a polyether-based urethane (meth) acrylate, or a mixture thereof. The decorated sheet molded product according to claim 3.