Water soluble graft copolymers for laser print deinking loop clarification

摘要

A method for clarifying the laser print deinking loop water in a papermaking process by using a water soluble graft copolymer having the structure: <IMAGE> wherein E is the repeat unit obtained after polymerization of an alpha , beta ethylenically unsaturated compound, the molar percentage of a:b is from about 95:5 to 5:95, with the proviso that the sum of a and b equals 100%; G comprises the structure: <IMAGE> wherein d is a cationic monomer, R1, R2 and R3 are the same or different and are hydrogen or a lower alkyl group having C1 to C3, F is the salt of an ammonium cation and the molar percentage of c:d is from 95:5 to 5:95 with the proviso that the sum of c and d equals 100%.