Thermoplastic elastomers with improved extrusion performance

Details Thermoplastic elastomers with improved extrusion performance Thermoplastic elastomers with improved extrusion performance

1995-09-08

1996-09-03

Seccuro, Jr., Carman J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 89, 525 86, 525 71, 525193, 525194, 525240, C08L 2326, C08L 5300

Patent

active

055524826

ABSTRACT:
A partially dynamically vulcanized or crosslinked thermoplastic polyolefin elastomer/uncrosslinked olefin polymer blend has improved extrusion performance. The uncrosslinked olefin polymer is selected from (1) a heterophasic olefin composition prepared by polymerization in at least two stages comprising (a) 10% to 50% by weight of a propylene homopolymer or a propylene copolymer, (b) 5% to 20% by weight of a semicrystalline, essentially linear ethylene copolymer fraction, and (c) 40% to 80% by weight of an ethylene copolymer fraction that is soluble in xylene at ambient temperature, (2) crystalline butene-1 homopolymer, and (3) a substantially amorphous ethylene/propylene or ethylene/butylene copolymer; or a substantially amorphous terpolymer of (a) ethylene, (b) propylene or butylene, and (c) a nonconjugated diene.

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