Catalyst and process for the syndiotactic polymerization of vinylaromatic compounds
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United States of America Patent
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Feb 6, 2001
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N/A
app pub date -
Feb 25, 1998
filing date -
Feb 27, 1997
priority date (Note) -
Expired
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Abstract
A catalyst for the polymerization of vinylaromatic monomers, and particularly styrene, with a high yield and a high syndiotacticity index, comprises the product consisting of the following two components in contact with each other: A) an .eta..sup.5 -cyclopentadienyl complex of titanium; B) an organo-oxygenated compound of aluminum; and contains a sufficient amount of at least one carboxylated product having the following general formula: R--COO--G (I) wherein R--COO is a carboxylic group comprising the organic radical R having from 1 to 30 carbon atoms, and G represents a hydrogen atom, an aliphatic or aromatic hydrocarbon group having from 1 to 20 carbon atoms or a metal atom, possibly substituted, linked to said carboxylic group.
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