WASSERLOESLICHE VERZWEIGTE BLOCKCOPOLYMERE

Die Erfindung betrifft wassloesliche verzweigte Blockcopolymere aus quaternaeren Ammoniumeinheiten und Polyalkylenglykolen, wobei die quaternaere Ammoniumeinheiten enthaltenden Molekuelbausteine Rueckgratketten bilden, die durch Polyalkylenglykolbloecke weitmaschig verknuepft sind.

WO 200279282 A UPAB: 20021220 NOVELTY - New water-soluble, branched block copolymers (A) have a polymer backbones of quaternized 1-methyl-3,5-dimethylene-pyrrolidine units (I), linked together by replacing some of the units (I) with polyalkylene glycol block-containing units (II), the content of units (II) being 0.01-20 wt. % of (A). DETAILED DESCRIPTION - New water-soluble, branched block copolymers (A) have a polymer backbones of quaternary ammonium units of formula (I), linked together by replacing some of the units (I) with polyalkylene glycol block-containing units of formula (II), the content of units (II) being 0.01-20 wt. % of (A). R1 = H or 1-8C alkyl; X- = counter-ion, preferably chloride or methosulfate; R2 = H, Me or Et; n = 1-3; a = 6-100 and b = 0; or a, b = 6-40. An INDEPENDENT CLAIM is included for the preparation of (A). USE - The use of (A) is claimed as a coagulant and flocculant for the separation of suspended solids, especially in paper-making, waste water treatment or dewatering of slurries. ADVANTAGE - The 'wide-meshed' branched sturcture of (A) provides superior coagulant and flocculant activity to that of prior art cationic polymers, so that (A) can give a comparable separation effect at markedly reduced concentrations. (A) also have a high and controllable molecular weight, controllable viscosity and good solubility properties.