Patent ID: 7335709

Claim:
A water-soluble cationic copolymer or terpolymer composition obtained by continuous polymerization of acrylamide and at least one unsaturated cationic monomer selected from the group consisting of quaternized dialkylaminoalkyl(meth)acrylates and quaternized dialkylaminoalkyl(meth)acrylamides, wherein said polymerization is effected on a moving support with a predetermined residence time, and wherein during said polymerization the metering rate of the acrylamide or the at least one unsaturated cationic monomer is varied in the feed to the moving support in a continuous fashion according to an oscillation about a mean value, wherein oscillation is effected by steadily increasing and steadily decreasing back the metering rate over a time period of about 45 to about 60 minutes.