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Verfahren zur Polymerisation wasserloeslicher Vinylmonomerer in waessrigen hoeherkonzentrierten Dispersionen und Stabilisator zur Durchfuehrung des Verfahrens

Stabilizers for polymerization of water-soluble high-molecular vinyl monomers to polymers used in separation, contain water-soluble comb copolymer of quaternary ammonium compound and amphiphilic block copolyether.
 
: Hahn, M.; Paulke, B.; Jaeger, W.

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Frontpage ()

DE 2000-10055470 A: 20001109
DE 2000-10055470 A: 20001109
EP 2001-993638 AW: 20011022
WO 2001-EP12163 A: 20011022
DE 10055470 A1: 20020529
EP 1332164 A1: 20030806
C08F0002
C08F0226
Deutsch
Patent, Elektronische Publikation
Fraunhofer IAP ()

Abstract
Die vorliegende Erfindung betrifft Stabilisatoren fuer die Copolymerisation wasserloeslicher kationischer und nichtionischer Vinylmonomere zu waessrigen Polymerdispersionen mit erhoehtem Aktivgehalt und ein Verfahren zur Herstellung hoeherkonzentrierter Polymerdispersionen mit Hilfe dieser Stabilisatoren. Der Stabilisator ist ein kammfoermig aufgebautes Pfropfcopolymer aus einem kationischen Vinylpolymer als Rueckgratkette und einem Blockcopolymer mit ausbalancierten Hydrophil-hydrophob-Eigenschaften als haengende Seitenketten, welches aus Ethylenoxid und Butylenoxid gebildet wird.

 

WO 200238639 A UPAB: 20030710 NOVELTY - Stabilizers for polymerization of water-soluble high-molecular vinyl monomers contain water-soluble branched chain copolymer(s) of: (a) diallyldimethyl-ammonium, vinylpyridinium and N-vinylimidazolinium chloride(s); and (b) amphiphilic, monoallyl-end-functionalized block copolyether(s) with hydrophilic polyethylene glycol and hydrophobic polybutylene glycol chains. DETAILED DESCRIPTION - Stabilizers for polymerization of water-soluble high-molecular vinyl monomers contain water-soluble branched chain copolymer(s) (I) of: (a) cationic vinyl monomer(s) (II) selected from diallyldimethyl- ammonium chloride (IIA), vinylpyridinium chloride (IIB) and N-vinylimidazolinium chloride (IIC) or omega -(trimethylammonium)- (hydroxy)alkyl (meth)acrylate or -(meth)acrylamide halides and methosulfates of formula (IID); and (b) amphiphilic, monoallyl-end-functionalized block copolyether(s) (III) with hydrophilic polyethylene glycol (PEG) chains and hydrophobic polybutylene glycol (PBG) chains. CH2=C(R1)-C(=O)-A-B-N+(R2)(R2)-R2 X- (IID) R1 = hydrogen (H) or methyl; R2 = methyl; A = NH or oxygen (O); B = 2-5C (hydroxy)alkylene; X = halogen or methosulfate. An INDEPENDENT CLAIM is also included for the production of high-solid dispersions of water-soluble cationic high-molecular vinyl copolymers. USE - Cationic vinyl polymers, especially copolymers of cationic vinyl compounds with acrylamide, are widely used in separation processes for water treatment and waste liquor purification, in the paper, coal and ore industries or in petroleum recovery for flocculation, retention or dewatering. ADVANTAGE - Existing process for producing polymers of this type have various drawbacks, e.g. give polymers forming very viscous systems at concentrations below 10 wt.%, a product in 1:2 ratio with a hardly degradable oil phase, a product with bimodal molecular weight distribution of very limited use or a polymer unsuitable for separation technology. The present process gives a high-solid dispersion of water-soluble cationic high-molecular vinyl copolymer and avoids these drawbacks. The viscosity during production and use is much lower than usual and nearly constant. The final dispersion has low viscosity and excellent storage stability. The viscosity of the copolymer is significantly higher than that of a copolymer obtained by existing dispersion polymerization processes.

: http://publica.fraunhofer.de/dokumente/N-44073.html