Polyolefin-based composite resin composition having high strength and low linear expansion

摘要

The present invention relates to a polyolefin-based composite resin composition having excellent dimensional stability due to low mold shrinkage, low linear thermal expansion coefficient and low heat sag as well as having excellent mechanical strength, impact resistance, heat resistance, injection molding plasticity and surface smoothness of a product. The composition includes: 30-80% by weight of a crystalline ethylene-propylene copolymer; 5-40% by weight of an ethylene-alpha-olefin copolymer; 5-40% by weight of an inorganic fortifier; and additives.