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Wasserloesliche verzweigte Blockcopolymere

A water soluble branched copolymer containing quaternary ammonium units is useful as a coagulation or flocculation agent in the separation of suspended solids and in paper production for effluent treatment and sludge dewatering.
 
: Jaeger, W.; Hahn, M.; Lieske, A.; Korth, H.; Staeck, R.; Scordialo, A.

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Frontpage ()

DE 2002-10214087 A: 20020328
DE 2002-10214087 A: 20020328
EP 2003-712075 AW: 20030321
WO 2003-EP2991 A: 20030321
DE 10214087 B4: 20040506
EP 1487890 A1: 20041222
C08F0290
Deutsch
Patent, Elektronische Publikation
Fraunhofer IAP ()

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.

: http://publica.fraunhofer.de/dokumente/N-31064.html