Process for making alpha-olefin polymers or copolymers with high

Details Process for making alpha-olefin polymers or copolymers with high Process for making alpha-olefin polymers or copolymers with high

1980-04-14

1981-09-01

Garvin, Patrick

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

526140, 526141, 526142, C08F 464

Patent

active

042870933

ABSTRACT:
A process for making crystalline polymers or copolymers of alpha-olefins containing 3 to 8 carbon atoms, such as polypropylene, by polymerization with a catalyst consisting of a combination of titanium chloride and an organic aluminium compound, in the presence of a stereospecificity additive.
This stereospecificity additive is a cyclic polyether of the crown ether type, which may contain sulphur atoms and/or nitro radicals; this additive may be used together with an activator.
The process produces polymers or copolymers with a high isotacticity index, while keeping catalyst activity sufficiently high.

REFERENCES:
patent: 3779944 (1973-12-01), Cozewith et al.
patent: 3917575 (1975-11-01), Matsuura et al.
patent: 3989881 (1976-11-01), Yamaguchi et al.

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