Preparation of polyethylene and copolymers of predominant amount

Details Preparation of polyethylene and copolymers of predominant amount Preparation of polyethylene and copolymers of predominant amount

1990-04-12

1992-03-31

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 64, 526 65, 526 88, 526208, 526228, C08F 428, C08F 1002

Patent

active

051009781

ABSTRACT:
Polyethylene and copolymers of predominant amounts of ethylene and minor amounts of comonomers which are polymerizable with ethylene are obtainable by free radical polymerization of the monomers under from 1,500 to 5,000 bar and at from 40.degree. to 250.degree. C. by means of an initiator with virtually complete exclusion of oxygen in not less than n=3 polymerization stages, by a method in which, in the first stage, the total amount of the predominant part of the monomers are subjected to polymerization using some of the initiator required, until said polymerization comes virtually to a stop, thereafter a further part of the initiator and, if required, of the monomers are added to the mixture, which has been cooled by 20.degree.-60.degree. C., and this process is repeated in the subsequent stages until the n th stage, with the proviso that the initiators used in the (n-1) th stage have a half-life temperature of from 80.degree. to 160.degree. C.

REFERENCES:
patent: 3628918 (1971-12-01), Beals et al.
patent: 3660370 (1972-05-01), Gropper
patent: 3714135 (1973-01-01), Pfannmueller et al.
patent: 3875134 (1975-04-01), Morikawa et al.
patent: 4000357 (1976-12-01), Marano, Jr.
patent: 4076919 (1978-02-01), Urban et al.
patent: 4135044 (1979-01-01), Beals

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