Patent ID: 6803415
Filing Date: 2004-10-12
Classification: C08L

Abstract:
A flexible composition based on one or more propylene polymers having no elastomeric fractions, said flexible composition comprising a blend of:A) from 10 to 90 parts by weight of a random copolymer of propylene and at least one comonomer selected from the group consisting of ethylene and C4-C8 alpha-olefins, wherein said random copolymer of propylene has a melting point of at least 100Â° C. and not exceeding 140Â° C. and a melt flow index measured at 230Â° C. under a weight of 2.16 kg (ASTM standard D 1238, 1986) of from 0.5 to 15 g/10 min, and B) from 90 to 10 parts by weight of a plastomer prepared with participation of a metallocene catalyst, wherein said plastomer consists of a random copolymer of ethylene and at least one C3-C10 alpha-olefin, and wherein said plastomer has a density of from 0.860 to 0.920 g/cm3, a melt flow index measured at 190Â° C. under a weight of 2.16 kg (ASTM standard D 1238, 1986) of from 0.5 to 30 g/10 min, and a molecular mass distribution Mw/Mn of at most 4, wherein said random copolymer of propylene A is selected from the group consisting of A1) copolymers of propylene and ethylene comprising from 3 to 6% by weight of monomeric units derived from ethylene; A2) copolymers of propylene and butene comprising from 15 to 20% by weight of monomeric units derived from butane; and A3) terpolymers of propylene, ethylene and butene comprising from 0.5 to 2.5% by weight of monomeric units derived from ethylene and from 5 to 15% by weight of monomeric units derived from butene; and wherein said flexible composition has a flexural modulus (Emod) measured at 23Â° C. in accordance with ASTM standard D790M of 500 MPa or less.