Process for producing syndiotactic-1,2-polybutadiene

Details Process for producing syndiotactic-1,2-polybutadiene Process for producing syndiotactic-1,2-polybutadiene

1996-05-01

1997-10-14

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 91, 526 92, 526 93, 526139, 526140, 526141, 526142, 5263401, C08F 470, C08F 218

Patent

active

056774001

ABSTRACT:
In a process for producing syndiotactic-1,2-polybutadiene by suspension polymerization wherein a mixture composed of 1,3-butadiene, a cobalt compound, and an organometallic compound or metal hydride containing a metal of group I, II or III of the periodic table is contacted with an initiator selected from the group consisting of carbon disulfide, phenyl isothiocyanate and xanthogenic compounds in an aqueous medium, the improvement comprising, after the preparation of the mixture, adding thereto an anti gelling agent selected from the group consisting of alcohols, aldehydes, ketones, carboxylic acid esters, nitriles, sulfoxides, amides and phosphoric acid esters, whereby the formation of a rubber-like gelation product in the mixture is inhibited.

REFERENCES:
patent: 3901868 (1975-08-01), Ueno et al.
patent: 5109082 (1992-04-01), Matsuda et al.
patent: 5278263 (1994-01-01), Burroway
patent: 5346971 (1994-09-01), Hongyo et al.
patent: 5468822 (1995-11-01), Tsujimoto et al.

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