Easy processing ethylene propylene elastomers

Details Easy processing ethylene propylene elastomers Easy processing ethylene propylene elastomers

1987-02-24

1988-02-02

Seccuro, 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...

525240, 526 65, 526 66, C08L 2316

Patent

active

047229713

ABSTRACT:
By selecting the composition and intermolecular compositional distribution with respect to ethylene and diene content and the molecular weight and molecular weight distribution, ethylene-propylene-diene terpolymers can have both improved processing properties and compound vulcanizate physical properties. The lower molecular weight fractions of 10.sup.4 to about 5.times.10.sup.5 have at least 2 times the diene content of the higher molecular weight fractions and an ethylene content of 30-80 wt. %. The higher molecular weight fractions of 2.times.10.sup.5 to about 10.sup.7 have a higher ethylene content than the lower molecular weight fractions and are less than 90 wt. % ethylene.

REFERENCES:
patent: 3468979 (1969-09-01), Hamed et al.
patent: 3681306 (1972-08-01), Wehner
patent: 3884993 (1975-05-01), Gros et al.
patent: 4078131 (1978-03-01), Zarauz
patent: 4259468 (1981-03-01), Kajiura et al.
patent: 4306041 (1981-12-01), Cozewith et al.

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