Ethylene homopolymers and ethylene copolymers and a process for

Details Ethylene homopolymers and ethylene copolymers and a process for Ethylene homopolymers and ethylene copolymers and a process for

1993-05-06

1994-04-26

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 87, 526352, C08F 428, C08F 1002

Patent

active

053067916

ABSTRACT:
Novel ethylene homopolymers and ethylene copolymers which are suitable for film production and have a density from 925 to 940 kg /m.sup.3, a melt flow index (MFI) of <1 g/10 min at 190.degree. C. and at an applied force of 2.16 kp can be prepared by free radical polymerization of the monomers at from 500 to 5000 bar and reaction temperatures T of from 40.degree. to 320.degree. C. by means of an initiator with virtually complete exclusion of oxygen in at least n=3 polymerization stages. In the first stage, the total amount or the predominant part of the monomers is subjected to the polymerization by means of part of the required initiator until the polymerization virtually comes to a stop. A further part of the initiator and, if required, of the monomers is then added to the mixture cooled to 20.degree.-60.degree. C. This process is repeated in the subsequent stages until the n th stage, at least the initiators used in the n th stage having a half-life temperature of from 90.degree. to 260.degree. C., and that the maximum reaction temperature T.sub.max being 270.degree. C. or higher, at least in the n th stage.

REFERENCES:
patent: 5100978 (1992-03-01), Hasenbein et al.

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