Idemitsu Kosan Company, Limited

Akio Inayoshi

Kikuo Nagatoshi

Hidehiko Kaji

Noriki Fujimoto

Toshimichi Ito

Hitomi Tomari

Atsunobu Sakoda

Hirozo Sugahara

Yasuo Hata

Hirozo Sugahana

Shinsuke Sagata

Toshihide Nara

Since their surfaces are inactive, polyolefin resins are difficult to plate. A plating method utilizing sensitizing-activation of the surface has been used for plating polyolefin resins. Many attempts have been made to improve the plating properties of the surfaces of polyolefin resins, for example, a mechanical method, a method employing a solvent, a method of coating other types of resins on the surface, etc. As methods modifying the plastics themselves, there are several; a method of introducing polar radicals by graft polymerization, etc., a method of introducing atactic polypropylene or block copolymer of polypropylene and polyethylene, a method of mixing rubber or a copolymer of ethylene and vinyl acetate, a method of mixing in an inorganic filler, etc. Recently, it was attempted to apply a high chrome etching-catalyst method for plating polyolefin resin, said method being mainly used in the automatic process of plating although the plating adhesion is poorer than that obtained with the plating method of sensitizing-activation. However, there was found no polyolefin resin composition having plating properties that can compare with ABS resin for applying the plating method of a high chrome etching-catalyst method. We have developed a polyolefin resin composition which can be plated by a high-chrome etching-catalyst method. As a result, we have found that the object of the invention can be attained by blending a compound containing a cyano group with a mixture consisting of polyolefin resin and inorganic filler, and kneading and melting them.

Polyolefin resin composition

A resin composition comprising a modified polypropylene obtained by reacting a polypropylene with a liquid rubber and maleic anhydride in a solvent in the presence of a radical generator, another polyolefin and, if desired, an inorganic and/or an organic filler. The resin composition has excellent coating, adhesion and plating properties.

Resin compositions containing modified polypropylene

A process for producing a resin composition having excellent plating properties comprising heating a mixture consisting substantially of 100 parts by weight of a polyolefin resin, 5 to 150 parts by weight of an inorganic filler, 1 to less than 20 parts by weight of a liquid rubber, 0.1 to 10 parts by weight of an unsaturated carboxylic acid and 0.001 to 10 parts by weight of a radical generator at 110.degree. to 280.degree. C. in the absence of solvents.

Process for production of resin compositions with excellent plating

A process for producing modified polypropylene comprising reacting polypropylene with a liquid rubber and maleic anhydride in a solvent in the presence of a radical generator.

Process for production of modified polypropylene

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Sodegaura, Japan

Akio Inayoshi