Elastomeric copolymers of ethylene and propylene, the production

Details Elastomeric copolymers of ethylene and propylene, the production Elastomeric copolymers of ethylene and propylene, the production

1985-12-06

1987-06-30

Michl, Paul R.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525323, 526142, 526348, C08F 466

Patent

active

046771727

ABSTRACT:
The invention concerns elastomeric copolymers of ethylene and propylene wherein the proportion by weight of units derived from ethylene is from 34 to 67% and the proportion by weight of units derived from propylene is from 33 to 66%. The copolymers are characterized in that 60% at least of the units derived from propylene are disposed in sequences of at least three successive units and that their fusion enthalpy, as measured after a given heat treatment, is lower than 15 cal/g (calories per gram) and in most cases is from 5 to 10 cal/g. The copolymers of the invention can be used in particular for the production of isotactic polypropylene compositions.

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CA, 77, 21089r.

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