Chemistry of hydrocarbon compounds – Unsaturated compound synthesis – By addition of entire unsaturated molecules – e.g.,...
Reexamination Certificate
2007-07-17
2007-07-17
Caldarola, Glenn (Department: 1764)
Chemistry of hydrocarbon compounds
Unsaturated compound synthesis
By addition of entire unsaturated molecules, e.g.,...
C585S520000, C585S525000, C526S237000, C526S348700
Reexamination Certificate
active
10433439
ABSTRACT:
Polyisobutenes in which at least 60 mol % of the polymer chains have at least one olefinically unsaturated terminal group are prepared by cationic polymerization of isobutene or isobutene-containing monomer mixtures in the condensed phase by a process in which the polymerization is carried out in the presence of an initiator system comprisingi) a Lewis acid selected from covalent metal chlorides and semimetal chlorides andii) at least one organic compound I having at least one functional group FG which forms a carbocation or a cationic complex with the Lewis acid under the polymerization conditions, where FG is selected from acyloxy, alkoxy and halogen, which are bonded to a secondary or tertiary carbon atom or to an allylic or a benzylic carbon atom,in a solvent inert toward the Lewis acid, the Lewis acid being used in less than the stoichiometric amount, based on the functional groups FG.
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2001-258855/27 Derwent Abst.
Lange Arno
Rath Hans Peter
BASF - Aktiengesellschaft
Bullock In Suk
Caldarola Glenn
Novak Druce & Quigg LLP
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