Controlling the molecular weight of polybutadiene

Details Controlling the molecular weight of polybutadiene Controlling the molecular weight of polybutadiene

C - Chemistry, Metallurgy

08

F

402/444

C08F 136/06 (2006.01) C08F 4/70 (2006.01)

Patent

CA 1236648

ABSTRACT OF THE DISCLOSURE CONTROLLING THE MOLECULAR WEIGHT OF POLYBUTADIENE There is disclosed a process for the regulation of the molecular weight of a high-cis 1,4-polybutadiene prepared by polymerizing 1,3-butadiene in a solution of an aliphatic and/or cycloaliphatic or aromatic solvent system employing as a catalyst system a mixture of (1) an organonickel compound, (2) an organoaluminum compound, and (3) a fluorine containing compound selected from the group consisting of hydrogen fluoride and hydrogen fluoride complexes which are prepared by complexing hydrogen fluoride with a ketone, an aldehyde, a nitrile, a mineral acid containing oxygen, an ester, an ether, an alcohol, a phenol or water; said polymer- ization being conducted in the presence of small amounts of olefins selected from the group consisting of 1-butene, isobutylene, cis and trans-2-butene and allene.

425670

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