Catalyst composition and polymerization process for producing sy

Details Catalyst composition and polymerization process for producing sy Catalyst composition and polymerization process for producing sy

1998-06-01

2000-09-12

Wood, Elizabeth D.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526135, 526335, 502102, 502103, 502117, 502118, 502120, 502121, 502150, 502152, 502153, 502154, 502155, 502162, 502171, 502208, 502210, C08F 406, C08F 3600, B01J 3100

Patent

active

061179566

ABSTRACT:
The instant invention teaches a method for forming a syndiotactic 1,2-polybutadiene product having a higher syndiotacticity and a higher melting temperature than syndiotactic 1,2-polybutadiene produced using chromium catalysts known in the prior art. The method includes polymerizing 1,3-butadiene in solution with a solvent, in the presence of catalytically effective amounts of: (a) a chromium compound; (b) an organomagnesium compound; and, (c) a cyclic hydrogen phosphite.

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Hidetomo Ashitaka, Hideo Ishikawa, Haruo Ueno, and Akira Nagasaka, Syndiotactic 1,2-Polybutadiene With Co-CS.sub.2 Catalyst System. 1. Preparation, Properties, and Application of Highly Crystalline Syndiotactic 1,2-Polybutadiene, Journal of Polymer Science: Polymer Chemistry Edition, vol. 21, 1853-1860 (1983).
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