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WASSERLOESLICHE VERZWEIGTE BLOCKCOPOLYMERE

New water-soluble, branched block copolymers based on quaternized pyrrolidine units and polyalkylene glycol linkages, useful as coagulants and flocculants, e.g. in paper-making or waste water treatment.
 
: Hahn, M.; Jaeger, W.

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Frontpage ()

DE 2001-10116430 A: 20010402
WO 2002-EP3510 A: 20020328
WO 2002079282 A1: 20021010
C08F0026
Deutsch
Patent, Elektronische Publikation
Fraunhofer IAP ()

Abstract
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.

: http://publica.fraunhofer.de/dokumente/N-44904.html