Process for the manufacture of polycarboxylic acids using phosphorous containing reducing agents
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United States of America Patent
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Jan 30, 2007
Grant Date -
Apr 24, 2003
app pub date -
Oct 9, 2002
filing date -
Oct 18, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for the production of polycarboxylic acids is provided via the present invention. The novel method herein comprises the steps of i) mixing a phosphorous containing reducing agent with at least one carboxylic acid monomer to form a reaction mixture; ii) adding an equivalent of base to the reaction mixture to provide a partially neutralized reaction mixture; and iii) adding a free radical generator to the partially neutralized reaction mixture under polymerization conditions to form a phospho/carboxylic acid polymer containing solution. Preferred monomers, reducing agents and free radical generators are also disclosed.
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