Synthesis of high vinyl polybutadiene utilizing a molybdenum cat

Details Synthesis of high vinyl polybutadiene utilizing a molybdenum cat Synthesis of high vinyl polybutadiene utilizing a molybdenum cat

1988-08-31

1990-03-27

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502117, 526162, 526169, 526335, C08F 478, C08F 3606

Patent

active

049121820

ABSTRACT:
High vinyl polybutadiene rubber is utilized in a variety of applications. For instance, high vinyl polybutadiene is utilized in tire tread rubber compositions because it provides both good traction and rolling resistance. The present invention discloses a technique for synthesizing high vinyl polybutadiene utilizing a molybdenum catalyst system. This molybdenum catalyst system can be utilized in aliphatic solvents with high yields of about 75% being attained. The molybdenum catalyst systems of this invention are comprised of (a) a molybdenum containing compound which is prepared by modifying molybdenum pentachloride, molybdenum trichloride, or molybdenum tetrachloride with an alkyl carboxylic acid or an aryl carboxylic; and (b) an aluminum containing compound which is prepared by modifying a trialkyl aluminum compound with a phenol. The molecular weight of the high vinyl polybutadiene being prepared can be reduced by modifying the trialkyl aluminum compound with an allylphenol, such as 2-allylphenol.

REFERENCES:
patent: 3451987 (1969-06-01), Dawans et al.
patent: 3663480 (1972-05-01), Zelinski et al.
patent: 3772263 (1973-11-01), Dawans et al.

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