POLYPROPYLENE COMPOSITIONS CONTAINING GLASS FIBER FILLERS

摘要

Composition comprising (A) from 30 to 60 by weight, of a soft polyolefin composition comprising, 10-50% by weight of a copolymer (a) of propylene, which copolymer contains from 1 to 8% of comonomer content; 50-90wt % of a copolymer (b) of ethylene and other alpha-olefin(s), containing from 57 to 80% of ethylene;
wherein the weight ratio of the content of copolymer component (b) to the fraction XS soluble in xylene at room temperature (about 25° C.), both (b and XS) referred to the total weight of (a)+(b), is of 1.5 or less, and the intrinsic viscosity [η] of the said XS fraction is of 3 dl/g or more; and the total quantity of copolymerized ethylene is preferably from 30% to 65% by weight; (B) from 5 to 30 wt % of a glass fiber filler; (C) from 0 to 5% by weight of a compatibilizer; (D) from 10 to 40 by weight of a polypropylene component selected from propylene homopolymers, propylene copolymers containing up to 5% by moles of ethylene and/or C4-C10 α-olefin(s) and combinations of such homopolymers and copolymers, wherein the Melt Flow Rate, of the polypropylene component D) is generally from 0.3 to 2500 g/10 min.

主权项

1. A composition having a melt flow rate, measured according to ISO 1133 with a load of 2.16 kg at 230° C., from 2 to 100 g/10 min, the composition comprising:
A) from 30 to 60% by weight of a polyolefin composition comprising:
a) 10-50% by weight of a copolymer of propylene with one or more comonomer(s) selected from ethylene and CH2=CHR alpha-olefins, where R is a 2-8 carbon alkyl, which copolymer contains from 1 to 8% of comonomer(s);b) 50-90% by weight of a copolymer of ethylene and (i) propylene or (ii) other CH2=CHR alpha-olefin(s), where R is a 2-8 carbon alkyl radical, or (iii) a combination thereof, optionally with a diene, containing from 50 to 80% by weight of ethylene; wherein the weight ratio b/XS of the content b of copolymer component (b) to the fraction XS soluble in xylene at room temperature (about 25° C.), both (b and XS) referred to the total weight of (a)+(b), is 1.5 or less, and the intrinsic viscosity [η] of the XS fraction is 3 dl/g or more; and the total quantity of copolymerized ethylene is from 30% to 65% by weight; B) from 5 to 30% by weight of a glass fiber filler; C) from 0.5 to 3% by weight of a compatibilizer; D) from 10 to 40% by weight of a polypropylene component selected from propylene homopolymers, propylene copolymers containing up to 5% by moles of ethylene and/or C4-C10 α-olefin(s) and combinations thereof, where the melt flow rate, measured according to ISO 1133 with a load of 2.16 kg at 230° C. of the polypropylene component D), is from 0.3 to 2500 g/10 min.