Hydrophilic cationic copolymers of acrylamide or methacrylamide
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United States of America Patent
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Sep 29, 1987
Grant Date -
N/A
app pub date -
Jul 24, 1984
filing date -
Jul 30, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cationic polymer composition suitable for use as a flocculating agent and as a retention aid and dewatering agent in paper making consists of a mixture of (a) a hydrophilic cationic polymer of (a.sub.1) acrylamide and/or methacrylamide and (a.sub.2) dialkylamino-C.sub.2-3 alkylene-(meth)acrylamide the molar quantity of cationic monomer units (a.sub.2) being from 0.2 to 9 mol % of the total (b) an anionic surfactant (c) a water-immiscible oil in which the polymer (a) is insoluble, and optionally (d) a lipophilic non-ionic surfactant, optionally (e) water and optionally (f) an oil-miscible polar solvent. The compositions may be prepared by water-in-oil emulsion copolymerization and are readily diluted with water.
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