"Heterogeneous lewis acid-type catalysts"
AssigneeExxon Chemical Patents Inc.
InventorsFrank Joung-Yei Chen, Herve Cheradame, Jon Edmond Stanat, Gerard Rissoan
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Abstract
A solid state insoluble salt catalyst system for the carbocationic polymerization of olefin monomer in the presence of a polar or non-polar reaction medium, which comprises (a) solid state catalyst component comprising at least one salt of a strong acid and a carbocationically active transition metal selected from Groups III A, IV A, V A and VI A of the Periodic Table of Elements, wherein said salt is insoluble in the reaction medium; and (b) cocatalyst component effective for promoting the carbocationic polymerization.
Claims15
A process for the cationic polymerization of olefin monomer which comprises:
- (a) contacting polymerizable olefin, in the presence of a polar or non-polar solvent reaction medium, with a solid state, insoluble, salt catalyst system comprising:
- (i) solid state heterogeneous catalyst component comprising at least one salt selected from the group consisting of the salts of a strong acid and a Group III A, Group IV A, Group V A or Group VI A transition metal selected from the group consisting of yttrium, lanthanum, zirconium, hafnium, niobium, tantalum, molybdenum and tungsten, wherein said catalyst component is insoluble in the reaction medium;
- and
- (ii) cocatalyst component effective for promoting the carbocationic catalytic activity of said catalyst component;
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- (b) maintaining contact between said polymerizable olefin monomer, said catalyst component and said cocatalyst component at a temperature and for a period of time sufficient to effect polymerization of said olefin monomer.
Dependencies are inferred from the claim text.