Patent ID: 7816466

Claim:
A process for preparing a propylene polymer composition comprising (weight percentages being referred to as a sum of A+B): (A) 75-95% by weight of a copolymer of propylene comprising from 1.5 to 2.2 mole % of comonomer units derived from ethylene, a C 4 -C 8 alpha-olefin, or mixtures thereof; and (B) 5-25% by weight of a copolymer of propylene comprising from 25 to 45 Mole % of ethylene units; the propylene polymer composition comprising a melt flow rate value of from 30 to 35 g/10 min according to ISO 1133 (230° C., 2.16 Kg); the process comprising at least two sequential polymerization steps wherein the copolymer (A) is prepared in at least one first polymerization step and the copolymer (B) is prepared in at least one second polymerization step; and wherein the copolymer (A) is produced by a gas-phase polymerization process carried out in at least two interconnected polymerization zones.