- 4 PROCESS FOR PREPARING A METHACRYLATE COPOLYMER CONTAINING QUATERNARY AMMONIUM GROUPS BY FREE-RADICAL POLYMERIZATION IN SOLUTION

摘要

(A) from 80 to 99% by weight of a C ₁ -C ₄ -alkyl ester of acrylic acid or methacrylic acid; And (b) from 20 to 1% by weight of an alkyl ester of acrylic or methacrylic acid having a quaternary ammonium group in the alkyl radical; And (c) from 0 to 10% additional copolymerizable vinyl monomers, wherein the monomer mixture comprises at least one polymerization initiator, at least one polymerization initiator, Optionally, at least one molecular weight modifier and at least one solvent or solvent mixture is added to provide a polymerization mixture, which is polymerized at a temperature of from 30 to 120 DEG C over a period of from 2 to 24 hours, wherein the conversion of the polymerization mixture to monomer By weight or more to provide a polymerization syrup, the polymerization syrup is subsequently degassed by distillation or extrusion, and the degassed polymerization syrup is further pulverized to obtain a copolymer preparation in granular or powder form, formulation of 25,000 to 50,000 molecular weight (M _w), a polydispersity of 2.0 to 3.0 and even to 10,000 ppm by weight Relates to the bay, it characterized in that the residual solvent concentration method.