C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/260
C08F 8/30 (2006.01) C02F 1/54 (2006.01) C02F 1/56 (2006.01) C08F 8/44 (2006.01)
Patent
CA 1258146
ABSTRACT OF THE DISCLOSURE METHOD OF PREPARING CATIONIC TERPOLYMERS AND PRODUCT DERIVED THEREFROM Novel high molecular weight water soluble terpoly- mers derived from ethylenically unsaturated monomers with pendent amide groups, carboxyl groups and ester groups containing a 2-hydroxypropyltrimethylammonium- chloride moiety are flocculants of high efficacy. These terpolymers may be prepared by reaction between glycidyl trimethylammoniumchloride and copolymers of acrylamide and acrylic acid. The compositions are derived from acrylamide-acrylic acid copolymers and may contain as little as 4-7% of chain segments containing the 2- hydroxypropyltrimethylammoniumchloride moiety connected to the polymer backbone via an ester linkage. The acrylamide-acrylic acid copolymers may be obtained by any known process entailing either copoly- merization of the corresponding monomers or controlled hydrolysis of either polyacrylamide or poly- acrylonitrile. The terpolymer formation is achieved either by reaction between such copolymers and glycidyltrimethylammoniumchloride, or by conducting the polymerization of the comonomer mixture in the presence of glycidyltrimethylammoniumchloride at conditions at which reaction between this chloride and carboxyl groups occurs. The terpolymers may also be obtained by reaction between 3-chloro-2-hydroxypropyl- trimethylammonium chloride and copolymers of acrylamide and the alkali metal salts of acrylic acid or methacrylic acid such as sodium or potassium acrylate or methacrylate.
488199
Gowling Lafleur Henderson Llp
Rhone-Poulenc Inc.
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