Method of preparing syndiotactic 1,2-polybutadiene with a chromi

Details Method of preparing syndiotactic 1,2-polybutadiene with a chromi Method of preparing syndiotactic 1,2-polybutadiene with a chromi

1998-10-14

1999-07-06

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526136, 526335, C08F 469, C08F13606

Patent

active

059198753

ABSTRACT:
A process for polymerizing 1,3-butadiene into syndiotactic 1,2-polybutadiene is described using a catalyst system comprising (a) a chromium-containing compound, (b) an organoaluminum hydride, and (c) a hydrogen phosphite. The use of the catalyst system avoids the use of environmentally detrimental components such as carbon disulfide and halogenated solvents. The syndiotactic 1,2-polybutadiene can be used as a plastic or as an additive for rubber compositions wherein it can crosslink with conventional rubbers using conventional crosslinking agents.

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An article by L. Porri and A. Giarrusso in Comprehensive Polymer Science, vol. 4, pp. 53-107, entitled "Conjugated Diene Polymerization" published in 1989 by Pergamon Press, Oxford.
An article by H. Ashitaka et al. in Journal of Polymer Science Polymer Chemistry Edition, vol. 21, pp. 1853-1860 and 1951-1995 entitled Syndiotactic 1,2-Polybutadiene with Co-CS.sub.2 Catalyst System. I. Preparation, Properties, and Application of Highly Crystalline Syndiotactic 1,2-Polybutadiene, II. Catalysts for Stereospecific Polymerization of Butadiene to Syndotactic 1,2-Polybutadiene, III. .sup.1 -and .sup.13 C-NMR Study of Highly Syndiotactic 1,2-Polybutadiene, and IV Mechanism of Syndiotactic Polymerization of Butadiene with Cobalt Compounds-Organoaluminum-CS.sub.2 published in 1983 by John Wiley & Sons, Inc., New York.

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