POLYPROPYLENE RESIN COMPOSITION FOR CAR BUMPER COVER, COMPRISING CRYSTALLINE POLYPROPYLENE RESIN, ETHYLENE-ALPHA-OLEFIN COPOLYMER RUBBER, INORGANIC FILLING MATERIAL AND ORGANIC PEROXIDE

摘要

PURPOSE: Provided is a polypropylene resin composition for a car bumper cover, which shows excellent coating adhesion in flame plasma pretreatment painting system with no use of CPP primers. CONSTITUTION: The polypropylene resin composition for a car bumper cover comprises (a) 50-80 parts by weight of a crystalline polypropylene resin having a melt index of 20-80 g/10min(230deg.C), which is a homopolymer of propylene or binary copolymer of propylene and ethylene; (b) 10-30 parts by weight of low Mooney ethylene-alpha-olefin copolymer rubber having a Mooney viscosity(ML 1+4, 100deg.C) of 4-9; (c) 10-20 parts by weight of talc as an inorganic filling material; and (d) 0.1-0.5 PHR of an organic peroxide having a half-life(10 hours) of 140deg.C or more, based on 100 parts by weight of (a+b+c).