Mitsui Petrochemical Industries, Ltd.

Kotaro Kishimura

Satoru Moriya

Riichiro Nagano

Fumitoshi Ikejiri

Yoshinori Akana

Akio Ishimoto

Teiichi Shiomi

Yozo Yamamoto

Cycloolefin type random copolymer compositions

A primer composition composed of 1 to 100 parts by weight of a chlorinated carboxyl group-containing .alpha.-olefin polymer and 100 parts by weight of an organic solvent therefor, the improvement wherein

Primer composition for substrates

A surface treating agent for a shaped article of a polyolefin is provided which is composed of a solution in an organic solvent of a propylene-ethylene copolymer having a monoalkyl ester of a monolefinic dicarboxylic acid, such as monomethyl maleate, grafted thereto. The propylene-ethylene copolymer has a propylene content of 50 to 75 mole %, and a crystallinity, determined by an X-ray diffraction method, of 2 to 20%. The esterification degree of the alkyl ester of the monolefinic dicarboxylic acid is 45 to 100% if the esterification degree is taken as 200% when all of the carboxyl groups of the dicarboxylic acid are esterified. The amount of the monoalkyl ester grafted is 0.5 to 15% by weight. The grafted propylene-ethylene copolymer has an intrinsic viscosity [.eta.] of at least 0.3 and is dissolved in an amount of 10 to 100 kg per cubic meter of the organic solvent. The surface treating agent is suitable as an undercoat for a polyolefin shaped article. It greatly improves the adhesion of a paint to the polyolefin article, and has excellent storage stability.

Surface treating agent as an undercoat on surface of polyolefin shaped

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Ohtake, Japan

Kotaro Kishimura