Propylene polymer blends, processes of producing the same and polypropylene resin compositions

Abstract

A propylene polymer blend is disclosed which comprises (A) a propylene-α-olefin random copolymer with a propylene content of 90 to 99% by weight and (B) a propylene-α-olefin random copolymer with a propylene content of 55 to 90% by weight, wherein the intrinsic viscosity ([ηB]) of the copolymer B ranges from 1.3 to 3.5 dl/g, the ratio ([ηB]/[ηA]) of the intrinsic viscosity ([ηB]) of the copolymer B to the intrinsic viscosity ([ηA]) of the copolymer A ranges from 0.5 to 1.3 and a product (([ηB]/[ηA])×(WA/WB)) of the intrinsic ratio ([ηB]/[ηA]) of both copolymers and the weight ratio (WA/WB) of both copolymers ranges from 1.0 to 4.5. A polypropylene resin composition comprises 99 to 99.9999% by weight of the propylene polymer blend and 1 to 0.0001% by weight of an α-crystal nucleating agent.

Dependencies are inferred from the claim text.