JPH06271707A - Printing of thermoplastic elastomer - Google Patents

Abstract

PURPOSE:To provide a molding made of a specified thermoplastic elastomer compound and improved in adhesion to ink, coating agent or the like by irradiating the molding with ultraviolet rays and printing it with a urethane ink. CONSTITUTION:95-50wt.% styrenic or olefinic thermoplastic elastomer is blended with 5-50wt.% thermoplastic elastomer having reactive groups represented by vinyl groups to obtain a thermoplastic elastomer compound. A molding obtained by molding this compound is irradiated with ultraviolet rays to effect its surface modification, and is used for printing by using a urethane ink.

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] Covers for home appliances, mobile devices, etc.
The present invention relates to a surface treatment and decoration method for a molded product of styrene-based or olefin-based elastomer such as a case, a switch and a grip.

[0002]

2. Description of the Related Art Ester-based or urethane-based elastomers are mainly used for home electric appliances, portable covers, casings, switches, grips and other molded products.

[0003]

Ester-based or urethane-based thermoplastic elastomers are poor in heat resistance and inferior in versatility. In addition, the material cost is high and the hardness variation is small. On the other hand, styrene-based or olefin-based thermoplastic elastomers have good weather resistance, many hardness variations, and excellent elastic properties, but since they do not have a reactive group, they do not adhere to inks, paints, etc. It was extremely inferior and could not be subjected to surface treatment of the molded product, secondary processing such as decoration, and addition of functionality.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention is directed to a styrene-based or olefin-based thermoplastic elastomer having excellent weather resistance, hardness variation, elastic properties, and the like, which has a reactive group represented by a vinyl group as a modifier. After molding with a thermoplastic elastomer compound blended with a plastic elastomer, the surface that undergoes secondary processing such as printing and painting is irradiated with ultraviolet rays to modify the surface to improve the adhesion of ink, paint, etc. Greatly improved.

[0005]

[Example 1] 90% by weight of styrene elastomer (Made by Mitsubishi Petrochemical, Lavalon SJ6400) and vinyl bond amount of 56%
After blending 10 wt% of the included elastomer (VS-1 made by Kuraray) to make a molded article with a thermoplastic elastomer compound, and after performing surface modification by UV irradiation,
Printing with urethane ink (Seiko Advance RUX), cross-cut test (base tape method) and X-ray cut tape method (Mecut tape method) <
According to JIS K 5400>, the ink adhesion was very good and could be improved to a practical level.

[0006]

Example 2 Similar to Example 1, a thermoplastic elastomer compound molded product obtained by blending 70% by weight of a styrene elastomer and 30% by weight of an elastomer containing 56% of vinyl bond in the same product was subjected to surface treatment by irradiating with ultraviolet rays. Also in this case, the ink adhesion was very good and could be improved to a practical level.

[0007]

[Example 3] Similar to Example 1, a thermoplastic elastomer compound molded product obtained by blending 50% by weight of a styrene elastomer and 50% by weight of an elastomer containing 56% of vinyl bond in the same product was subjected to surface treatment by irradiating with ultraviolet rays. Also in this case, the ink adhesion was very good and could be improved to a practical level.

[0008]

[Reference Example 1] It was found that in the case of a molding product in which a vinyl group-containing elastomer was not blended with a compound of 100% by weight of a styrene-based elastomer, ink adhesion was poor (less than 100/100 in a crosscut test). .

[0009]

[Reference Example 2] Even in the case of a compound molded product obtained by blending less than 50% by weight of a styrene-based elastomer or more than 95% by weight with 50% by weight or more or less than 5% by weight of an elastomer containing 56% of a vinyl bond, the ink adhesion is also good. I found something bad.

[0010]

Reference Example 3 It was found that the adhesion of the ink was poor even when the molded products of the compounds having the blend ratios of Examples 1 to 3 were not irradiated with ultraviolet rays.

[0011]

EFFECTS OF THE INVENTION In the present invention, a reactive group represented by a vinyl group is blended and further irradiated with ultraviolet rays, so that the reliability of printing and painting is very good, and the weather resistance is also good.
There are many variations in hardness, and we are now able to offer products that are rich in rubber elasticity.

Silicon rubber used as a contact rubber for an ON / OFF switch in the past, or NB used as a component with emphasis on appearance such as color tone and feel.
If the present invention is used as an alternative to R (including PVC blended PVC hikers), cost reduction can be achieved.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location // C08L 23/00 LCB 7107-4J

Claims (1)

[Claims] 1. A thermoplastic elastomer compound obtained by blending 95 to 50% by weight of a styrene-based or olefin-based thermoplastic elastomer with 5 to 50% by weight of a thermoplastic elastomer containing a reactive group represented by a vinyl group. After irradiating the molded product with ultraviolet rays to perform surface modification,
Printing method to print with urethane ink.