Process producing a polymer comprising an unsaturated carboxylic acid or a derivative thereof
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United States of America Patent
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May 6, 1997
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N/A
app pub date -
Apr 26, 1995
filing date -
Apr 27, 1994
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Expired
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Abstract
Disclosed is a process for producing a polymer of an unsaturated carboxylic acid or a derivative thereof, the process comprising polymerizing an unsaturated carboxylic acid or a derivative thereof in a water-soluble organic solvent-water mixture in the presence of at least one polymerization catalyst selected from the group consisting of a metal compound of the formula L.sub.p.M.X.sub.q ( 1) wherein M is Ti, Zr, Hf or V, L is cyclopentazienyl, indenyl, fluorenyl or a derivative of these, X is halo, H, lower alkyl, lower alkoxyl, aryloxy, phenyl or benzyl, p and q each represents an integer including 0 and p+q is equal to the valence of M, and a metal compound of the formula R.M.Y.sub.r ( 2) wherein M is defined above, R is a group formed by bonding, via a lower alkylene or di(lower alkyl)silylene group, two groups being cyclopentadienyl, indenyl, fluorenyl or a derivative of these, Y is halo, H, lower alkyl, lower alkoxyl, aryloxy, phenyl or benzyl, r is equal to the valence number of M minus 2.
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