Automotive material with excellent flow, high stiffness, excellent ductility and low CLTE
AssigneeBorealis AG
InventorMichael Tranninger
Life of this patent
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Abstract
Composition having a melt flow rate MFR2 (230° C.) in the range of 10 to 50 g/10 min. said composition comprises two heterophasic polypropylenes comprising a propylene homopolymer matrix and an elastomeric copolymer, a plastomer and a mineral filler, wherein—said two heterophasic polypropylenes have different melt flow rates, —the first heterophasic polypropylene has a melt flow rate MFR2 (230° C.) in the range of 3.0 to 30.0 g/10 min and—the second heterophasic polypropylene has a xylene cold soluble (XCS) content in the range of 7.0 to 20.0 wt.-%.
Claims17
A composition having a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 10 to 50 g/10 min.,
- said composition comprises a heterophasic polypropylene (H-PP1), a heterophasic polypropylene (H-PP2), a plastomer (P) and a mineral filler (F), wherein
- (a) the heterophasic polypropylene (H-PP1) has a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 3.0 to 30.0 g/10 min and comprises
- (a1) a matrix (M1) being a propylene homopolymer and
- (a2) an elastomeric copolymer (E1) comprising units derived from propylene and ethylene and/or C4 to C20 α-olefin.
- (b) the heterophasic polypropylene (H-PP2) has a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 40.0 to 1000.0 g/10 min and
- a xylene cold soluble (XCS) content measured according to ISO 6427 in the range of 7.0 to 20.0 wt.-% and comprises
- (b1) a matrix (M2) being a propylene homopolymer and
- (b2) an elastomeric copolymer (E2) comprising units derived from propylene and ethylene and/or C4 to C20 α-olefin, and
- (c) the plastomer (P) is different to the elastomeric copolymer (E1) and to the elastomeric copolymer (E2).
The composition according to any one of the preceding claims, wherein the heterophasic polypropylene (H-PP2) has
- (a) a total propylene content 85.0 to 96.0 wt.-% and/or
- (b) a higher total propylene content compared to the heterophasic polypropylene (H-PP1) and/or
- (c) a propylene content in the xylene cold soluble (XCS) fraction of 50.0 to 75.0 wt.-%.
Dependencies are inferred from the claim text.