POLYMER COMPOSITION FOR BUMPERS AND INTERIORS AND POLYETHYLENE-BASED RESIN PRECURSOR

摘要

Polyolefin compositions suitable for injection molded items e.g. for impact bumpers and car interiors comprising from 30% to 90% by weight of an heterophasic propylene polymer composition (A); and from 10% to 70% by weight of a multimodal ethylene/butene-1 copolymer (B); having density from 0.850 to 0.935 g/cm3, total comonomer content from 6% to 30% by weight, Mw/Mn from 4 to 20; intrinsic viscosity in decalin at 135° C. from 1.0 to 4.0 dL/g, and comprising an HDPE fraction (HDPE % wt) up to 30% wt; further comprising from 0 to 50% by weight of a filler (C) and optionally, in amount up to 10% by weight with respect to the overall composition, an impact modifier masterbatch component D consisting of an ultra-soft heterophasic copolymer component.

主权项

1. A polyolefin composition comprising:
A) from 30% to 90% by weight of a propylene polymer composition comprising:
a1) from 20% to 90% by weight of a propylene homopolymer or of a copolymer of propylene or blends thereof, containing 8% by weight or less of copolymerized ethylene or C4-C10 α-olefin(s) or blends thereof, said homopolymer or copolymer or blends having an isotactic index higher than 80%,a2) from 10% to 80% by weight of a copolymer of ethylene containing from 40% to 70% by weight of copolymerized propylene or C4-C10 α-olefin(s) or of combinations thereof;said composition A having intrinsic viscosity of the xylene soluble fraction at room temperature of from 1.5 to 8 dl/g; B) from 10% to 70% by weight of a multimodal ethylene copolymer with butene-1 as comonomer having the following properties:
i) density comprised in the range from 0.850 to 0.935 g/cm3 as measured according to ISO1183-1::2004;ii) total butene-1 comonomer content ranging from 6% to 30% by weight;iii) Mw/Mn comprised from 4 to 20;iv) intrinsic viscosity, as determined in decalin at 135° C. according to EN IS0 1628-312003, comprised between 1.0 and 4.0 dL/g, and comprising an HDPE fraction (HDPE % wt) determined via TREF analysis of up to 30% wt C) up to 50% by weight of a filler.