Procedure for gas-phase polymerication of ethylene allowing the

Details Procedure for gas-phase polymerication of ethylene allowing the Procedure for gas-phase polymerication of ethylene allowing the

1989-12-08

1991-10-08

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526209, 5263486, 526352, 526901, 526904, C08F 234, C08F 432

Patent

active

050555359

ABSTRACT:
A process for the manufacture of a linear polyethylene with narrow molecular-weight distribution comprising polymerizing ethylene alone or a mixture of ethylene and an alpha-olefin in which ethylene represents at least about 70% by weight of the total monomers involved, in a gas-phase polymerization medium in the presence of a catalytic component containing at least one transition metal, magnesium, and a halogen, a co-catalyst comprising an alkylaluminum compound, and a monoether, the monoether having the general formula R'OR", wherein R' and R" are the same or different and each is a C.sub.1 to C.sub.8 linear or branched hydrocarbon radical or being a cyclic monoether with the oxygen forming a ring having 4 to 12 carbon atoms.

REFERENCES:
patent: 4256866 (1981-03-01), Karayannis et al.
patent: 4684703 (1987-08-01), Wagner et al.
patent: 4701505 (1987-10-01), Fujii et al.

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