| abstract |
PCT No. PCT/DE96/01273 Sec. 371 Date Mar. 23, 1998 Sec. 102(e) Date Mar. 23, 1998 PCT Filed Jan. 30, 1997 PCT Pub. No. WO97/03098 PCT Pub. Date Jan. 30, 1997This invention concerns comb-like branched, water-soluble cationic acrylamide copolymers, prepared from 1-40 mole % of a water-soluble cationic prepolymer backbone of formula I-[A-B-NR]n-Iwhere A is an unsaturated ammonium compound or acrylamide and B-NR- is selected from the group consisting of olefinically unsaturated, functional amine-group-containing monomers, triethanolamine, and diethanolalkylamine, and the amount of B-NR is 1 mole % to 50 mole % and n represents a degree of polymerization which leads to molecular weights in the range from 1000 to 200,000 g/mole, and 60 to 99 mole % acrylamide by graft polymerization of the acrylamide onto the amine-group-containing cationic prepolymer backbone with a water-in-oil emulsion technique, and the comb-like branched acrylamide copolymers have a molecular weight of >1 million. |