Polycarboxylic acids with small amount of residual monomer
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United States of America Patent
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Jul 19, 1988
Grant Date -
N/A
app pub date -
Feb 24, 1987
filing date -
Feb 24, 1987
priority date (Note) -
Expired
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Abstract
A polymer of an olefinically unsaturated carboxylic acid containing 3 to 5 carbon atoms is prepared which contains less than 0.2% by weight unreacted monomer in a solvent selected from acetone and lower alkyl acetates also in the presence with less than 5% of a crosslinker selected from polyalkenyl polyethers of polyhydric alcohols containing more than one alkenyl group per molecule wherein the polyhydric alcohol contains at least 4 carbon atoms and at least 3 hydroxyl groups and initiator selected from peroxides and peroxydicarbonates. Polymerization temperature is 40.degree. to 85.degree. C. and viscosity of the mixture after completing polymerization is less than 1000 cps. About 1 to 10% of the carboxyl groups on the polymer are neutralized.
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