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Among these preparation methods, preferred are those by anion exchange with a quaternary ammonium carbonate. A specific example for preparation of a quaternary ammonium salts of a carboxyl-containing polymer, in the case of a trimethyloctylammonium salt of polyacrylic acid, is as follows: Into a pressure vessel, are charged dimethyloctylamine (1 mole) and dimethyl carbonate (1 mole or more) together with methanol, and reacted at an elevated temperature (at about 120° C.) under pressure (about 5 kg/cm2) to obtain a solution in methanol of trimethyloctylammonium carbonate. Then, the solution is added at a temperature of 80-90° C. gradually to an aqueous solution of polyacrylic acid, whereby carbon dioxide is simultaneously generated vigorously. Generated carbon dioxide and methanol are distilled off to obtain an aqueous solution of trimethyl-octylammonium salt of polyacrylic acid.

1. customAmong these preparation methods
2. additioncontaining polymer
3. customreacted at an elevated temperature (at about 120° C.) under pressure (about 5 kg/cm2)