Regulating the reaction in the preparation of polyisobutylene

Details Regulating the reaction in the preparation of polyisobutylene Regulating the reaction in the preparation of polyisobutylene

1993-09-21

1995-01-03

Nagumo, Mark

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526237, 5263487, 526 70, 526 90, C08F 414, C08F11010

Patent

active

053787790

ABSTRACT:
A process for regulating the reaction in the preparation of polyisobutylene by polymerizing isobutylene at from -130.degree. to 0.degree. C. in the presence of from 0.01 to 1.0% by weight of a Friedel-Crafts catalyst, from 0.0001 to 0.1% by weight of a molecular weight regulator, and a low boiling point solvent that is inert under the reaction conditions, the percentages by weight being based in each case on isobutylene, in which the solvent that has evaporated in the polymerization is continuously removed, liquefied and recycled in the liquid state to the polymerization zone, wherein vinyl ethers are used as molecular weight regulators. The vinyl ether used in this process acts both as an accelerator and an inhibitor of the cationic polymerization.

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patent: 5254649 (1993-10-01), Miln et al.
Pat. Abst. of Japan, vol. 14, No. 4941 (C-77) (English abstract of JP-A 52 151 381).

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