SURFACE TREATING AGENT COMPRISING MODIFIED PROPYLENE-ETHYLENE COPOLYMER, PROCESSES FOR PREPARING SAID SURFACE TREATING AGENT, AND USE OF SAID SURFACE TREATING AGENT IN THE TREATMENT OF ARTICLES OF AN OLEFIN RESIN

摘要

A surface treating agent for fabricated articles of polyolefins which is composed of an organic solvent solution of a modified polymer resulting from the graft copolymerization of a propylene-ethylene copolymer with maleic acid or maleic anhydride. 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 amount of maleic acid or maleic anhydride grafted is 0.5 to 15% by weight. The modified polymer has an intrinsic viscosity of at least 0.3, and is dissolved in the organic solvent in a concentration of 10 to 100 kg/m3 of solvent. The treating agent is suitable as an undercoat of the polyolefin articles and permits coating of a paint with markedly improved adhesion.