Stock material or miscellaneous articles – Composite – Of polycarbonate
Patent
1999-02-10
2000-12-19
Thibodeau, Paul
Stock material or miscellaneous articles
Composite
Of polycarbonate
428500, 428523, 524902, 524912, 525 92A, 525133, 525178, 525182, 525183, 525184, B32B 2718, B32B 2728, B32B 2730, C08L 7700
Patent
active
061625450
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an agent for providing an electrostatic coating property and improving the water resistance of a coating film, an electrostatically coated resin molded article, and an electrostatic coating method. More particularly, the present invention relates to an agent for providing an electrostatic coating property and improving the water resistance of a coating film that allows electrostatic coating immediately after molding without the coating of a conductive primer for under coating in electrostatically coating a styrene-based resin molded article and provides an excellent water resistance for a coating film after coating, an electrostatically coated resin molded article using the same, and an electrostatic coating method using the same.
BACKGROUND ART
Conventionally, many molded articles of styrene-based resins, such as ABS resin, have excellent electrical insulation. In electrostatically coating the molded article, the surface of the molded article to be coated should be conductive. As a method for making the resin surface conductive, a method for coating the resin surface with a conductive primer or a method for kneading the resin and a metal filler, such as a conductive carbon, is usually used. However, with the method for coating the resin surface with a conductive primer, variations in the film thickness of the conductive primer deteriorates the electrostatic coating property (the coating efficiency). In addition, the primer coating step makes the process complicated. Furthermore, with the method for kneading the resin and a conductive filler, if the filler is poorly dispersed, a coating unevenness occurs and the impact strength of the resin decreases.
In general, in order to electrostatically coat the resin molded article with good efficiency, the article to be coated should be a conductive material (a surface resistivity of 10.sup.10 .OMEGA. or less). Conventionally, as a method for decreasing the surface resistivity of the resin, for example, 1 a method for kneading the resin and a surfactant having a low molecular weight or coating the resin with the surfactant, and 2 a method for kneading a polyamide-based elastomer having a high molecular weight generally called a permanently antistatic agent (Japanese Patent Application (Tokko Hei) No. 4-72855) are disclosed.
However, with the above method 1, the desired conductivity cannot be provided in many cases because the antistatic agent is washed off when a washing treatment is performed in a degreasing step before coating. In addition, even if coating can be performed, the antistatic agent bleeds onto the surface of a coating film after coating, causing blisters (surface roughness). Therefore, this method is substantially difficult to use. With the method 2, the bleeding problems as in 1 is eliminated because a material having a high molecular weight is used. However, since a generally used polyamide-based elastomer comprises polyoxyalkylene glycol whose constituent unit is an oxyethylene group for providing conductivity, the water resistance is poor, deteriorating the water resistance and adhesion of the coating film significantly.
DISCLOSURE OF INVENTION
In view of the above prior art problems, it is an object of the present invention to provide an agent for providing an electrostatic coating property and improving the water resistance of a coating film that allows electrostatic coating immediately after molding without coating a resin molded article with a conductive primer, without causing the blisters of the resin surface, and without deteriorating the water resistance and the mechanical strength, and provides excellent water resistance for a coating film after coating.
The inventors have made keen examinations to solve the above problems and found that mixing a resin composition comprising a specific polyetheresteramide and a specific vinyl copolymer in a polystyrene-based resin molded article for a vehicle c an provide an electrostatic coating property for the molded article and improve the water
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patent: 5652326 (1997-07-01), Ueda et al.
patent: 5886098 (1999-03-01), Ueda et al.
Loudon, Organic Chemistry, 2nd Edition, p. 881, 1988.
Inada Eiji
Kamiyama Shiro
Kohama Katsumi
Masuda Hisashi
Okada Takeo
Honda Giken Kogyo Kabushiki Kaisha
Sanyo Chemical Industries Ltd.
Thibodeau Paul
Zacharia Ramsey
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