process for the production of carboxylatreichen copolymers from monoethylenisch ungestu00e4ttigten mono - and dicarboxylic acids and carboxylatreiche copolymers with low neutralisationsgrad

摘要

The invention relates to a method for producing high-purity quaternary ammonium compounds by reacting the corresponding tertiary sp3-hybridized amine or sp2-hybridized imine with dimethyl sulfite. According to said method, the reaction is carried out (i) in the presence of an inorganic or organic Bronsted acid having a pKa value of 1.8 to 14, measured at 25 DEG C in an aqueous solution; and (ii) at a temperature of 10 to 100 DEG C.