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US 10,647,838 B2Granted
Heterophasic propylene copolymer with low shrinkage
AssigneeBorealis AG
InventorsGeorg Grestenberger, Daniela Mileva, Susanne Kahlen, Pavel Shutov
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Abstract
A heterophasic propylene copolymer (HECO) comprising a polypropylene matrix having a melt flow rate MFR2 (230° C.) in the range of 40 to 120 g/10 min and a comonomer content in the range of 30 to 75 mol-% for the preparation of molded articles with low CLTE.
Claims11
An automotive article comprising at least 60 wt. % of a heterophasic propylene copolymer (HECO) having comonomers being ethylene and/or a C4 to C8 α-olefin, and comprising:
- (a) a (semi)crystalline polypropylene (PP) having a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 40 to 120 g/10 min;
- and
- (b) an elastomeric propylene copolymer (ESC) dispersed in said (semi)crystalline polypropylene (PP);
- wherein said heterophasic propylene copolymer (HECO) has:
- (i) a xylene cold soluble (XCS) fraction in the range of 22 to 64 wt. %;
- (ii) a comonomer content in the range of 30.0 to 75.0 mol %;
- (iii) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 15 to 70 g/10 min;
- and
- (iv) a xylene cold insoluble (XCI) fraction;
- wherein further the intrinsic viscosity (IV) of the xylene cold soluble (XCS) fraction of said heterophasic propylene copolymer (HECO) is in the range of 1.30 to 2.20 dl/g;
- and
- wherein the intrinsic viscosity (IV) of the xylene cold insoluble (XCI) fraction of the heterophasic propylene copolymer (HECO) is in the range of 1.05 to 1.45 dl/g.
9 more elements
Dependencies are inferred from the claim text.