Method of producing allyletherester monomers for production of cement dispersants
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United States of America Patent
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Apr 19, 2005
Grant Date -
Jul 10, 2003
app pub date -
Jun 13, 2002
filing date -
Oct 16, 2001
priority date (Note) -
Expired
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Abstract
Allyletherester monomers to be used as an intermediate product for the production of graft copolymers and/or their salts for use as cement dispersants are prepared by an esterification reaction of .alpha.-allyl-.omega.-hydroxy-polyoxyalkylene refined so as to have peroxide value less than 5.0 meq/kg and aliphatic monocaboxylic acid under a specified condition in the absence of solvent and in the presence of an antioxidant.
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