Amphoteric water-soluble polymer dispersion and use thereof
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United States of America Patent
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Jul 31, 2007
Grant Date -
Jul 8, 2004
app pub date -
May 28, 2002
filing date -
Jun 11, 2001
priority date (Note) -
Expired
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Abstract
The invention relates to an amphoteric water-soluble polymer dispersion containing polymer particles with particle diameters of 100 .mu.m or smaller and produced by dispersion-copolymerization of a monomer mixture comprising a methacrylate monomer containing a quaternary ammonium salt group, an acrylate monomer containing a quaternary ammonium salt group, an anionic monomer, and a (meth)acrylamide in respectively ratios specified in an aqueous salt solution in the presence of a polymer dispersant soluble in the aqueous salt solution and the invention also relates to a dewatering agent for organic sludge, a pretreatment agent or yield improver for paper making raw materials, and/or a drainage properties-enhancing agent using the amphoteric water-soluble polymer.
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