Water soluble graft copolymers and methods of use thereof
AssigneeBetz Laboratories, Inc.
InventorsWen P. Liao, Fu Chen
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Abstract
A water soluble graft copolymer useful for dewatering wastewater having the structure: ##STR1## 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: ##STR2## wherein d is a cationic monomer, R.sub.1, R.sub.2 and R.sub.3 are the same or different and are hydrogen or a lower alkyl group having C.sub.1 to C.sub.3, 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%.
Claims12
A method of dewatering wastewater comprising adding to the wastewater from about 10 ppm to about 1000 ppm, based on active polymer, of a water soluble graft copolymer having the structure:
- ##STR8## 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:
- ##STR9## wherein R.sub.1, R.sub.2 and R.sub.3 are the same or different and are hydrogen or a lower alkyl group having C.sub.1 to C.sub.3, 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 euqals 100%.
The method of claim 22 wherein the copolymer has a number average molecular weight of from about 1,000,000 to 30,000,000.
Dependencies are inferred from the claim text.