Heterophasic polypropylene with high flowability and excellent low temperature impact properties
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United States of America Patent
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May 21, 2013
Grant Date -
Nov 4, 2010
app pub date -
Oct 28, 2008
filing date -
Dec 17, 2007
priority date (Note) -
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Abstract
The present invention relates to a heterophasic polypropylene resin comprising a propylene homo- or copolymer matrix (A) and an ethylene-propylene rubber phase (B) dispersed within the matrix, wherein the heterophasic polypropylene resin has a fraction insoluble in p-xylene at 25° C. (XCU) with an intrinsic viscosity of 1.5 dl/g or less, determined according to DIN EN ISO 1628-1 and -3 and an amount of propylene monomer units of at least 95 mol %, and a fraction soluble in p-xylene at 25° C. (XCS) with an intrinsic viscosity of 1.5 to 3.0 dl/g, determined according to DIN EN ISO 1628-1 and -3, and an amount of propylene monomer units of 50 to 75 mol %, and a MFR (2.16 kg, 230° C.) of more than 100 g/10 min, determined according to ISO 1133, a heterophasic polypropylene composition comprising such a resin, a process for preparing that resin, and an article made thereof.
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