C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 236/06 (2006.01) C08F 4/54 (2006.01) C08F 136/06 (2006.01)
Patent
CA 2117949
PROCESS FOR POLYBUTADIENE PRODUCTION USING CATALYST WITH HIGH ACTIVITY Abstract of the Disclosure A process for producing high cis-1,4-polybutadienes using a catalyst system based on a rare earth compound that exhibits improved catalytic activity is provided which process comprises polymerizing 1,3-butadiene in a polymerization medium comprising a hydrocarbon solvent at a temperature of from about 0°C to about 120°C in the presence of a catalyst system which is a mixture of (1) a rare earth carboxylate selected from the group of neodymium carboxylates wherein the carboxylate has from 4 to 12 carbon atoms, (2) an alkyl aluminum chloride selected from the group of compounds represented by the formulae R2AlCl2, R23Al2Cl3 and R22AlCl wherein R2 is a hydrocarbon residue having from 8 to 12 carbon atoms and (3) an organo aluminum compound of the formula R32AlH wherein R3 is an alkyl group having from 2 to 6 carbon atoms, the ratio of the mols of the rare earth carboxylate to the mols of (2) plus (3) is in the range from about 1:1.5 to about 1:100, to the desired conversion.
Knauf Thomas Franz
Osman Akhtar
Lanxess Inc.
Polysar Rubber Corporation
Smart & Biggar
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