Patent ID: 7202319
Filing Date: 2007-04-10
Classification: C08F

Abstract:
1. Water-soluble copolymers based on olefinic sulfonic acids, characterized in that they contain a) 5 to 93 wt.-% structural units of formula (Ia) and/or (Ib) in which R R M=hydrogen, ammonium or a monovalent, divalent or trivalent metal cation and x=1 to 3 b) 1 to 50 wt.-% structural units of formula (IIa) and/or (IIb) in which R R M=hydrogen, ammonium or a monovalent, divalent or trivalent metal cation and x=1 to 3 c) 5 to 93 wt-% structural units of formula (III) in which R R y=3 to 7 d) 1 to 25 wt.-% structural units of formula (IVa) and/or (IVb) and/or (IVc) in which R R R R R X=O, NH n=1 to 6 r, s=0 to 5 t=1 or 2 u=1 to 50 and R and that the components a) to d) add up to 100 wt.-%.