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

1975-03-03

1978-02-07

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, 526139, 526141, 526351, C08F 466, C08F 1006

Patent

active

040728099

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 alkylaluminum compound-titanium chloride catalyst by using in combination small amounts of hydrogen sulfide and a sterically hindered, lower alkyl substituted, cyclic, tertiary amine, a sterically hindered, lower alkyl substituted, cyclic, amine oxide, or a trihydrocarbylphosphite. 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: 3240773 (1966-03-01), Boor
patent: 3502634 (1970-03-01), Stedefeder et al.
Kolesov et al., Chemical Abstracts, vol. 75, (1971), 153658u.
Vesely et al. Jour. Poly. Sci., Vol. 55, (1961) pp. 25-32.

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