Synthesis of trans-1,4-polybutadiene having controlled molecular

Details Synthesis of trans-1,4-polybutadiene having controlled molecular Synthesis of trans-1,4-polybutadiene having controlled molecular

1994-08-12

1995-09-05

Zitomer, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526142, 5261691, 526335, 5263486, C08F 470, C08F 3606

Patent

active

054480027

ABSTRACT:
Trans-1,4-polybutadiene is normally synthesized utilizing transition metal or rare earth catalysts. However, molecular weight control is difficult to achieve with such catalysts and the molecular weight of the polymer produced is frequently much higher than desired. By utilizing the catalyst system and techniques of this invention, trans-1,4-polybutadiene can be synthesized continuously to a high level of conversion with molecular weight control being possible. This invention specifically relates to a process for synthesizing trans-1,4-polybutadiene by polymerizing 1,3-butadiene monomer in the presence of a catalyst system which is comprised of an organocobalt compound, an organoaluminum compound and a para-substituted phenol with molecular weight being controlled by conducting the polymerization in the presence of at least one dialkyl sulfoxide, diaryl sulfoxide or dialkaryl sulfoxide. Such polymerizations can be conducted on a batch or a continuous basis. In the case of continuous processes, it is normally desirable to conduct the polymerization in the presence of carbon disulfide as a gel inhibitor.

REFERENCES:
patent: 3607841 (1971-09-01), Nakahara
patent: 4517349 (1985-05-01), Fujiwara
patent: 4933400 (1990-06-01), Jarvis
patent: 4988781 (1991-01-01), McKinney
patent: 5089574 (1992-02-01), Castner

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