Ethylene/butene-1 copolymers

Details Ethylene/butene-1 copolymers Ethylene/butene-1 copolymers

1990-11-20

1992-01-28

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526125, C08F21016

Patent

active

050845403

ABSTRACT:
Crystalline copolymers of ethylene and alpha-olefins CH.sub.2 .dbd.CHR in which R is an alkyl group having 2 to 8 carbon atoms, containing 0.5 to 3% by moles of polymerized alpha-olefin and having a density lower than 0.945 g/cc are obtained by polymerizing, in the gas phase, mixtures of ethylene and the alpha-olefins in contact with catalysts prepared from (1) Ti compounds supported on Mg halides and (2) organometallic compounds, which are active in the polymerization of ethylene but exhibit little, if any, activity in the homo- or copolymerization of the alpha-olefins.

REFERENCES:
patent: 3645992 (1972-02-01), Elston
patent: 3901863 (1975-08-01), Berger et al.
patent: 3920621 (1975-11-01), Baxmann et al.
patent: 3981849 (1976-09-01), Frese et al.
patent: 4089808 (1978-05-01), Zucchini et al.
patent: 4243619 (1981-01-01), Fraser et al.

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