Basf Aktiengesellschaft

Gunther Isbarn

Karl-Heinz Fauth

Andreas Deckers

Roger G Klimesch

Erich Kolk

Hans-Joachim Muller

Joachim Krobb

Heinz Plaumann

Franz Merger

Eckehardt Wistuba

Friedrich Towae

Hans Hellbach

Waldemar Koehler

Eckehardt Witsuba

Carboxyl-containing isobutene copolymers are obtainable

Carboxyl-containing isobutene copolymers

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.

Regulating the reaction in the preparation of polyisobutylene

Hexamethylene diisocyanate and/or isomeric alkylene diisocyanates having 6 carbon atoms in the alkylene radical, preferably 2-methylpentamethylene 1,5-diisocyanate and/or 2-ethyltetramethylene 1,4-diisocyanate are prepared without the use of phosgene in a multiple-step process by means of

Multiple-step process for the preparation of hexamethylene

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Tiefenthal, Germany

Gunther Isbarn