C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 236/06 (2006.01) C08F 4/70 (2006.01) C08F 136/06 (2006.01)
Patent
CA 2117950
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°C to about 60°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 R3Al wherein R is an alkyl group having from 8 to 12 carbon atoms and, optionally triethylaluminum, the molar ratio of chloride in (2) to the total aluminum content in (2) plus (3) being specified and the ratio of the mols of the divalent cobalt salt to the total moll of (2) 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 (2) used, to the desired conversion.
Knauf Thomas Franz
Osman Akhtar
Knauf Thomas Franz
Lanxess Inc.
Osman Akhtar
Smart & Biggar
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