Catalyst and process for the polymerization of alpha-olefins

Details Catalyst and process for the polymerization of alpha-olefins Catalyst and process for the polymerization of alpha-olefins

1977-10-03

1981-09-08

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252429B, 526142, 526351, C08F 466, C08F 1006

Patent

active

042885809

ABSTRACT:
Novel catalysts and processes are disclosed for producing highly crystalline polypropylene and highly crystalline copolymers of propylene with ethylene or propylene with other alpha-olefins. Such catalysts can reduce the amount of low-molecular-weight and, particularly, amorphous polymers formed without serious effect on the polymerization yield. These novel catalysts and processes involve improving an alkyl-aluminum compound-titanium chloride catalyst by using in combination small amounts of sulfur dioxide and isobutylvinyl ether. Such catalyst systems are useful in slurry polymerization, bulk polymerization and techniques in which polymerization is accomplished utilizing monomer substantially in the vapor phase.

REFERENCES:
patent: 3156681 (1964-11-01), Kavesh et al.
patent: 3926928 (1975-12-01), Karayannis et al.
patent: 3950268 (1976-04-01), Karayannis et al.
patent: 4072809 (1978-02-01), Rogan
Boor, Journal of Polymer Science, Pt. A, vol. 3, pp. 995-1012 (1965).

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