Crystalline propylene copolymer compositions having improved sealability and optical properties and reduced solubility

摘要

Propylene polymer compositions comprising (by weight): A) from 15% to 60% with C₄-C₈ alpha-olefin(s), containing more than 10%, but less than 14%, of said C₄-C₈ alpha-olefins (s); B) from 40% to 85% of a copolymer of propylene with C₄-C₈ alpha-olefin(s), preferably butene, containing from 14% to 30% of said C₄-C₈ alpha-olefin(s), and optionally from 0.5% to 3% of ethylene; provided that the total content of C₄-C₈ alpha-olefin(s) in the propylene polymer composition be higher than 10%.