Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-04-02
1998-09-22
Wilson, Donald R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 74, 525 78, C08L 5106, C09D15106
Patent
active
058114890
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a coating composition used for the purpose of protection and beautifying various plastics and to a method of producing the same. In more detail, it relates to a resin composition for paint and adhesive, which shows excellent physical properties for film, sheet or moldings of various synthetic resins such as polyolefin resins, polyurethane resins, polyamide resins, acrylic resins and polyester resins.
2. Description of the Background
Plastics have many advantages such as high producibility, wide freedom of design, light weight, rust resistance and shock resistance, hence they are used widely as materials for parts of automobiles, electrical parts, building materials, and the like. Above all, since polyolefinic resins are low in cost and have many excellent properties such as moldability, chemical resistance, heat resistance, water resistance and good electrical characteristics, the resins are used extensively as industrial materials and are one of the materials that growth in demand is most expected in future. Different from synthetic resins which have polarity such as polyurethane resins, polyamide resins, acrylic resins and polyester resins, however, polyolefinic resins have the drawbacks of being difficult to paint and adhesion because of nonpolarity and crystallinity.
For this reason, the surfaces of polyolefinic resin moldings have been activated by plasma treatment or gas flame treatment in order to improve adherence, but this method has the drawback that the process is complicated, and is accompanied by a great deal of equipment cost and time loss. Moreover, the effect of surface treatment fluctuates due to the complexity in the shape of moldings and the influence of pigment and additives in resin, and the like.
In a method of painting without employing such a pretreatment, various primer compositions are used as can be seen in the painting of polypropylene bumpers of automobiles. However, these methods are encumbered with the troublesomeness of two-coat finishings.
As coating compositions for one-coat finishing, use has been made of chlorinated polyolefin, cyclized rubber, etc. that have strong adherent force to polyolefinic resins, but they exhibit poor weather resistance, moisture resistance, gasoline resistance, etc., resulting in insufficient performance of coated films. For this reason, attempts have been made to admix acrylic resin or alkyd resin having good physical properties as a paint for use. However, since acrylic resins or alkyd resins have poor compatibility inherently with chlorinated polyolefins, problems arise of decreased gloss of coated film, remarkably injured appearance, etc.
For improving these drawbacks, a coating composition prepared by copolymerizing acrylic monomer with chlorinated polyolefin is proposed in Japanese Unexamined Patent Publication No. Sho 58-71966. A paint composition having chlorinated polyolefin-modified hydroxyl group-containing acrylic copolymer copolymerized hydroxyl group-containing acrylic monomer or the like with chlorinated polyolefin and an isocyanate compound as essential components is proposed in Japanese Unexamined Patent Publication No. Sho 59-27968. An adhesive resin composition having hydroxyl group-containing acrylic-modified chlorinated polyolefin copolymerized hydroxyl group-containing acrylic monomer or the like in the presence of chlorinated polyolefin and liquid rubber and isocyanate compound as major components is proposed in Japanese Unexamined Patent Publication No. Sho 62-95372. Further compositions containing copolymer copolymerized chlorinated polyolefin with long-chain hydroxyl group-containing vinyl monomer, unsaturated carboxylic acid, unsaturated polyester resin or the like, isocyanate compound, ultraviolet absorber and antioxidant are proposed in Japanese Unexamined Patent Publication Nos. Hei 5-9428 and Hei 5-194910. However, chlorinated polyolefin has very poor reactivity with copolymerizable monomers or resins aforementioned. Hence, when
REFERENCES:
5, 1994. 20, 1993. 19, 1993. 19, 1993. 6, 1993. 28, 1993. 22, 1993. 22, 1993. 25, 1993. 1993. 22, 1993.
Shirai Takayuki
Ueda Takaaki
Urata Keiji
Nippon Paper Industries Co. Ltd.
Wilson Donald R.
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