Clear and flexible propylene polymer compositions
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United States of America Patent
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Jun 3, 2008
Grant Date -
Dec 30, 2004
app pub date -
Nov 22, 2002
filing date -
Nov 27, 2001
priority date (Note) -
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Abstract
A propylene polymer composition having a melt flow rate (MFR) value from 3 to 30 g/10 min, comprising (percent by weight): A) 50-90% of one or more propylene copolymer(s) having a content of xylene-insoluble mojety at room temperature of not less than 85%, selected from the group consisting of propylene-ethylene random copolymers containing from 1 to 7%, of ethylene; propylene-C.sub.4-C.sub.8 .alpha.-olefin copolymers containing 2-10% of the C.sub.4-C.sub.8 alpha-olefins; and propylene-ethylene-C.sub.4-C.sub.8 .alpha.-olefin copolymers containing 0.5-5% of ethylene and 2-6% Of C.sub.4-C.sub.8 .alpha.-olefins; and B) 10-50% of a copolymer of propylene containing from 8 to 40% of ethylene and optionally 1-10% of a C.sub.4-C.sub.8 alpha-olefin; the said MFR value (MFR (2)) being obtained by subjecting to degradation a precursor composition comprising the same components A) and B) in the above said proportions, but having the MFR value (MER (1)) from 0.1 to 5 g/10 min with a ratio MFR (2) to MFR (1) of from 1.5 to 20.
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