Process for cis-1,4-polybutadiene production with reduced gel fo

Details Process for cis-1,4-polybutadiene production with reduced gel fo Process for cis-1,4-polybutadiene production with reduced gel fo

1993-11-09

1995-03-14

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 93, 526151, 526153, 5263404, C08F 206, C08F 4602

Patent

active

053978510

ABSTRACT:
A process for producing high cis-1,4-polybutadienes wherein there is reduced gel formation is provided which process comprises: polymerizing 1,3-butadiene in a polymerization medium comprising an inert hydrocarbon solvent and water at a temperature of from about -30.degree. C. to about 60.degree. C. in the presence of a catalyst system which is a mixture of (1) a substantially anhydrous divalent cobalt salt, (2) diethyl aluminum chloride or ethyl aluminum sesquichloride and (3) an organo aluminum compound of the formula R.sub.3 Al wherein R is an alkyl group having from 8 to 12 carbon atoms and, optionally triethylaluminum, the molar ratio of chloride in the diethyl aluminum chloride plus (3) being from about 0.7:1 to about 1 and the molar ratio of chloride in the ethyl aluminum sesquichloride plus (3) being from about 0.7:1 to about 1.4:1 and the ratio of the mols of the divalent cobalt salt to the total mols of diethyl aluminum chloride or ethyl aluminum sesquichloride plus (3) being from about 1:15 to about 1:30, the water being employed at a level of from about 0.1 to about 0.8 millimol for every millimol of diethyl aluminum chloride or ethyl aluminum sesquichloride used, to the desired conversion.

REFERENCES:
patent: 3094514 (1983-06-01), Tucker
patent: 3135725 (1964-06-01), Carlson et al.
patent: 3284431 (1966-11-01), Gippin
patent: 4303769 (1981-12-01), Odar

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