Elastoplastische Polyolefinzusammensetzung.

摘要

Elastoplastic polyolefin compositions endowed with high flexibility, comprising: A) 10-50 parts by weight of a homopolymer of propylene with isotactic index greater than 80, or a copolymer of propylene with ethylene, another alpha -olefin, or combinations thereof, which copolymer contains over 85% by weight of propylene; B) 5-20 parts by weight of a copolymer fraction containing ethylene, insoluble in xylene at ambient temperature; C) 40-80 parts by weight of a copolymer fraction of ethylene and propylene or another alpha -olefin, or combinations thereof, and, optionally, minor portions of a diene, said fraction containing less than 40% by weight of ethylene, being soluble in xylene at ambient temperature, and having an intrinsic viscosity from 1.5 to 4 dl/g; the percent by weight of the sum of the (B) and (C) fractions with respect to the total polyolefin composition being of from 50% to 90% and the (B)/(C) weight ratio being lower than 0.4. 8