Method of treating surface of molded article of thermoplastic elastomer composition.

摘要

A method for treating the surface of a molded article, which comprises a combination of the steps of: providing a molded article made of a thermoplastic elastomer composition obtained by a thermal treatment of a mixture in the presence of an organic peroxide, which mixture is comprised of (A) an oil-extended olefinic copolymer rubber of an olefinic copolymer rubber having a Mooney viscosity (ML1+4100 DEG C) of 90-200 and a mineral oil type softening agent, (B) an olefinic plastic, and (C) a bismaleimide compound, the ratio by weight of (A) the oil-extended olefinic copolymer rubber to (B) the olefinic plastic, A/B, being 24/76 - 80/20, the content of (C) the bismaleimide compound being 0.1-3 parts by weight based on 100 parts by weight of the total amount of (A) the oil-extended olefinic copolymer rubber and (B) the olefinic plastic, contacting the surface of the molded article with a UV-rays absorbing liquid, and irradiating the surface of the molded article with UV-rays having main wave lengths of 300 nm, or less. According to the surface treatment of the present invention, the olefinic thermoplastic elastomer to which paints can hardly be applied hitherto shows good paintability and printability in addition to the inherent useful properties. Paint-coated molded articles obtained by the method of this invention find wide utility in the fields of various industries, especially in the field of automobile industry as exterior or interior parts.