IMPACT-RESISTANT POLYOLEFIN COMPOSITIONS

摘要

A polyolef?n composition comprising, all percentages being by weight: A) from 40 to 75% of a polypropylene component having a solubility in xylene at room temperature lower than 20% by weight; B) from 3 to 20% of a copolymer of ethylene with 15-35% by weight of C4-C10 a-olefin(s) having solubility in xylene at room temperature greater than 50% by weight, the intrinsic viscosity of the xylene soluble fraction being from 2.5 to 4 d1/g; C) from 10 to 35% of one or more elastomeric or plastomeric polymers different from B), having a Shore A hardness value equal to or lower than 90 points; D) from 5 to 25% of a mineral filler; and, optionally E) from 0.5 to 5% of a copolymer, different from C), of ethylene with propylene having an ethylene content from 20 to 70% by weight and a solubility in xylene at room temperature greater than 50% by weight, the intrinsic viscosity of the xylene soluble fraction being from 4 to 9 d1/g. wherein the amounts of A), B), C) and E) are referred to the total weight of A) + B) + C) + D) and optionally E).