JPH05320588A - Adhesive tape excellent in sparkling effect - Google Patents

Abstract

PURPOSE:To provide the subject sheet having a sparkling appearance and a good smooth printing surface by screen-printing the surface of a sheet with an ink produced by adding glass flakes, on whose surfaces the thin films of a substance having a metal luster are formed, to an organic solvent vehicle having a specific viscosity. CONSTITUTION:The surface of a substrate film such as a semi-rigid vinyl chloride polymer film is printed with an ink by a screen printing method using the 100 mesh screen of a polyester to provide the objective adhesive sheet exhibiting the excellent sparkling effect and the excellent printing surface smoothness and useful as a decorative adhesive sheet, the ink being produced by mixing 100 pts.wt. of the solid content of an organic solvent vehicle having a solution viscosity of 500-3000cps at 20 deg.C with 1-100 pts.wt. of glass flakes on whose surfaces the thin films of a substance, such as gold, silver, nickel or titanium nitride, having a metal luster are formed by a method such as a nonelectrolytic plating method, a vacuum-depositing method or a spattering method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive sheet having an excellent sparkling effect, that is, a glittering feeling.

[0002]

2. Description of the Related Art Conventionally, as a pressure-sensitive adhesive sheet for decoration, when the glittering or sparkling effect is exhibited,
It was obtained by including a filler in the printing ink containing aluminum flakes, aluminum paste or polyester glitter, and printing this. On the other hand, it is also possible to include glass flakes.

[0003]

However, since the filler has low surface smoothness and weak strength, it is deformed during kneading of the ink, and sufficient luster cannot be obtained. Moreover, since the corrosion resistance and the weather resistance are not sufficient, the application is limited mainly for interior use.

On the other hand, in the case of glass flakes, although they are excellent in terms of high surface smoothness and strength, they have high density and are easily oriented in the plane direction when printed, so that they reflect light. Since it is unidirectional, a sufficiently satisfactory sparkling effect cannot be obtained.

Therefore, an object of the present invention is to obtain an adhesive sheet having an excellent sparkling effect.

[0006]

[Means for Solving the Problems] The above problems are related to glass flakes having a thin film of a substance having metallic luster formed on the surface of 100 parts by weight of a solid content of an organic solvent-based vehicle having a liquid viscosity at 20 ° C. of 500 to 3000 cps. The problem can be solved by printing 1 to 100 parts by weight of ink on the surface by a screen printing method.

In this case, the resin component of the organic solvent-based vehicle can be vinyl chloride resin, urethane resin, polyester resin, acrylic resin or a mixture thereof. In addition, if the substance having metallic luster is gold, silver,
A group of nickel and titanium nitride is selected, and it is desirable that the glass flakes have a thickness of 10 μm or less and an average particle size of 10 to 150 μm.

[0008]

According to the present invention, since the base material is glass flakes, the surface smoothness is high and the strength is sufficient. However, since a thin film of a substance having a metallic luster is formed on the surface of the glass flake, the presence of this thin film exerts an excellent glittering or sparkling effect. Moreover, since the liquid viscosity is 500 to 3000 cps, excellent printing surface smoothness can be obtained by screen printing.
It has the effect of manifesting the sparkling effect.

[0009]

The present invention will be described in more detail below. As the pressure-sensitive adhesive sheet in the present invention, in addition to an appropriate base material such as paper, preferably a plastic base material having excellent weather resistance for utilizing the reflection of sunlight in the outdoors, such as polyester resin, acrylic resin or A resin containing these is used. A pressure sensitive adhesive may be applied to this one surface (back surface), and if necessary, a release sheet may be provided to protect the period until use. As the pressure-sensitive adhesive, a rubber-based, acrylic-based, ethylene-vinyl acetate-based, polyvinyl alcohol-based, urethane-based, or other appropriate adhesive can be used.

The surface of the base material is printed by a screen printing method. The thickness of the printing layer is preferably 10 to 30 μm. As the ink for this printing, 1 to 100 parts by weight of glass flakes having a thin film of a substance having a metallic luster on the surface are added to 100 parts by weight of the solid content of an organic solvent-based vehicle having a liquid viscosity of 500 to 3000 cps at 20 ° C. Parts, more preferably 5 to 80 parts by weight of ink is used.

The resin component of the organic solvent-based vehicle may be vinyl chloride resin, urethane resin, polyester resin, acrylic resin or a mixture thereof. The resin content is 25-100% by weight in the vehicle, especially
It is desirable to contain 50 to 100% by weight. Resin solids less than 12% in vehicle and liquid viscosity of 500 cps
When it is less than the above range, the glass flakes are oriented in the plane direction, and it is difficult to obtain a good sparkle feeling. On the other hand, if the liquid viscosity exceeds 3000 cps, some of the glass flakes project from the vehicle surface, impairing the smoothness of the printing surface.

The screen-printed surface can be further coated with a transparent clear resin. The clear resin may be applied after the pressure-sensitive adhesive sheet is attached to an object. The resin that constitutes the organic solvent-based vehicle may be transparent or semitransparent.

The material having metallic luster is selected from the group consisting of gold, silver, nickel and titanium nitride, and the glass flake has a thickness of 10
μm or less and average particle size of 10 to 150 μm, especially 30 to 10 μm
It is preferably 0 μm.

As a method for forming a thin film of a substance having a metallic luster on the surface of glass flakes, electroless plating,
Examples thereof include vapor deposition and sputtering. However, the electroless plating method is excellent in that it has high adhesion strength.

(Examples and Comparative Examples) Next, examples and comparative examples will be shown to clarify the effects of the present invention. 80 μm semi-rigid vinyl chloride film (white) manufactured by Bando Kagaku Co., Ltd. was used as a base film, and an adhesive (acrylic adhesive “ARONTAC S-3403” manufactured by Toagosei Kagaku Kogyo Co., Ltd. 10
1.0 parts by weight of polyisocyanate "Coronate L) manufactured by Nippon Polyurethane Co., Ltd. was added to 0 parts by weight).
It was applied in a thickness of 25 μm and further laminated on a silicone release paper.

A printing ink having the composition shown in Table 1 was screen-printed on this pressure-sensitive adhesive sheet with a Tetoron (trademark of Teijin Ltd.) 100 mesh screen, which was attached to an acrylic-coated iron plate and then exposed to sunlight. When the sparkling effect and the smoothness of the printed surface were visually observed in light of the above, the results shown in the same table were obtained. The special glass flakes are silver-plated flakes having an average particle size of 90 ± 30 μm. The organic solvent-based vehicles used were as follows. Further, the resin content of the organic solvent-based vehicle in a diluted state of 40%, where the blending amount of the special glass flakes is defined as (1) by weight (based on the present invention) relative to the solid content of the organic solvent-based vehicle. The part by weight based on the solid content is also shown as (2).

* 1: Sumdesitomo Bayer Urethane Co. "Desmophen 670 / Sumijour HT = 100/10", the concentration of which was adjusted with cyclohexanone. * 1: Desmophen 650 manufactured by Sumitomo Bayer Urethane Co., Ltd.
/ Sumijour HT = 100/10 "with concentration adjusted with cyclohexanone. * 1: "Desmophen 1155 /" manufactured by Sumitomo Bayer Urethane Co., Ltd.
Sumidule HT = 100/10 ”with concentration adjusted with cyclohexanone.

[0018]

[Table 1]

From these results, it is clear that the printing layer defined in the present invention exhibits an excellent sparkling effect and the smoothness of the printing surface.

In this case, the solid content is also included.

[0021]

As described above, according to the present invention, an adhesive sheet having an excellent sparkling effect and a smooth printed surface can be obtained.

Claims (3)

[Claims] 1. To 100 parts by weight of a solid content of an organic solvent-based vehicle having a liquid viscosity at 20 ° C. of 500 to 3000 cps, 1 to 100 parts by weight of glass flakes having a thin film of a substance having a metallic luster on its surface are added. An adhesive sheet with an excellent sparkling effect, characterized in that ink is printed on the surface by screen printing. 2. The pressure-sensitive adhesive sheet excellent in sparkling effect according to claim 1, wherein the resin component of the organic solvent-based vehicle is a vinyl chloride resin, a urethane resin, a polyester resin, an acrylic resin or a mixture thereof. 3. The material having metallic luster is selected from the group consisting of gold, silver, nickel and titanium nitride, and the glass flakes have a thickness of 10
The average particle size is 10 μm or less and the average particle size is 10 to 150 μm.
Adhesive sheet excellent in the described sparkling effect.