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

1979-06-13

1980-10-14

Levin, Stanford M.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

252429B, 260 336UA, 526139, 526140, 526141, 526142, 526351, C08F 416, C08F 452

Patent

active

042282535

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 aluminum 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: 2932633 (1960-04-01), Juveland et al.

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