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US 5,296,548 AGranted
Compositions of crystalline propylene polymers having a low seal temperature
AssigneeHimont Incorporated
InventorsMassimo Covezzi, Antonio Ciarrocchi
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Abstract
Discosed are compositions of crystalline propylene polymers comprising (by weight): A) 30-65% of a copolymer of propylene with a C.sub.4 -C.sub.8 .alpha.-olefin, containing from 98 to 80% propylene; B) 35-70% of a copolymer of propylene with ethylene and optionally from 2 to 10% of a C.sub.4 -C.sub.8 .alpha.-olefin, said copolymer containing 2 to 10% ethylene when the C.sub.4 -C.sub.8 .alpha.-olefin is not present, and 0.5 to 5% ethylene when the C.sub.4 -C.sub.8 .alpha.-olefin is present.
Claims7
A composition of crystalline propylene polymers consisting essentially of (percent by weight) either
- (I):
- A) 30-65% of a copolymer consisting of propylene and a C.sub.4 -C.sub.8 .alpha.-olefin containing from 98 to 80% propylene;
- and
- B) 35-70% of a copolymer consisting of propylene with ethylene, said copolymer containing 2 to 10% ethylene;
- or
- (II):
- A) 45-65% of copolymer (I) A);
- and
- B) 55-35% of a terpolymer consisting of propylene with ehtylene and from 2 to 10% of a C.sub.4 -C.sub.8 .alpha.-olefin, said terpolymer containing 0.5 to 5% ethylene, wherein the composition has a melting point of about 125.degree. to 140.degree. C. and is prepared by sequential polymerization.
6 more elements
Dependencies are inferred from the claim text.