Ethylene-propylene copolymers

Details Ethylene-propylene copolymers Ethylene-propylene copolymers

1981-05-27

1984-01-03

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526125, 5263482, 5263485, 5263486, 526916, C08F21016

Patent

active

044243308

ABSTRACT:
A copolymer based on ethylene and propylene, having a density of between 0.933 and 0.946 g/cm.sup.3 and a melt index of between 2 and 10 dg/min, wherein the copolymer has from 3 to 27 alkyl groups per 1000 carbon atoms in the molecule and wherein its density .rho. and its proportion m of alkyl groups in the molecule satisfy the relationship 0.948.ltoreq..rho.+0.71 m.ltoreq.0.9525. The copolymer is produced by feeding a flux comprising from 80 to 95% by weight of ethylene and from 5 to 20% by weight of propylene into at least one reactor in stationary operation, the reactor having at least one reaction zone; and copolymerizing the ethylene and propylene in the reactor at a pressure of from 300 to 2500 bar and a temperature of from 180.degree. to 320.degree. C. in the presence of a Ziegler type catalyst system.

REFERENCES:
patent: 3422055 (1969-01-01), Maloney
patent: 3981849 (1976-09-01), Frese et al.
patent: 4128607 (1978-12-01), Shiomura et al.

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