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Title
Wasserloesliche verzweigte Blockcopolymere
Date Issued
2004
Author(s)
Jaeger, W.
Hahn, M.
Lieske, A.
Korth, H.
Staeck, R.
Scordialo, A.
Patent No
2002-10214087
Abstract
(A1) Die Erfindung betrifft wasserloesliche verzweigte Blockcopolymere aus quaternaeren Ammoniumverbindungen und Polyalkylenglykolen, wobei die quaternaere Ammoniumgruppen enthaltenden Molekuelbausteine Rueckgratketten bilden, die durch Polyalkylenglykolbloecke weitmaschig verknuepft sind.
WO2003082938 A UPAB: 20031208 NOVELTY - A water soluble branched copolymer from polymeric backbone chains with quaternary ammonium units, where the backbone chains are mutually linked is new. DETAILED DESCRIPTION - A water soluble branched copolymer from polymeric backbone chains with quaternary ammonium units of formula (I): R1 = H, 1-8C alkyl, X- = counter ion, the backbone chains are mutually linked, and the individual units of formula (I) can be substituted by polyalkyene glycol blocks of formula (II): R2 = H, Me,=R3 = H, Me, Et, X- = counter ion, n = 1-3, a = 6-100, and the wt. units of formula II = 0.01-20 wt.% on the total wt. of block copolymer. An INDEPENDENT CLAIM is included for preparation of the block copolymer by radical polymerization of a quaternary ammonium diallylammonium compound of formula (III):R1 = H, 1-8C alkyl, X- = counter ion, and bis-(meth)acrylic acid esters of polyalkylene glycol of formula (IV): R2 = H, Me, R3 = H, Me, Et,=X- = counter ion, N = 1-3=,A = 6-100, and the wt. proportion of compounds of formula IV is 0.01-20 wt.% relative to both starting compounds. USE - The block copolymer is useful as a coagulation or flocculation agent in the separation of suspended solids (claimed), and in paper production for effluent treatment and sludge dewatering (claimed). ADVANTAGE - The copolymer, because of the quaternary ammonium units in its structure, has outstanding long term storage stability, and avoids some drawbacks of previous products, e.g. necessity of a very high concentration of prepolymer, excessive expense.
Language
de
Patenprio
DE 2002-10214087 A: 20020328