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Title
Verzweigte wasserloesliche kationische Acrylamid-Copolymere mit hohem Molekulargewicht und Verfahren zu ihrer Herstellung
Date Issued
2000
Author(s)
Hahn, M.
Jaeger, W.
Cramm, J.
Patent No
1995-19524868
Abstract
Water-soluble comb-type branched cationic acrylamide copolymers of formula (I) with high mol. wt., which have side chains formed by acrylamide and a main chain formed by linear cationic prepolymer (II) contg. amino gps., are new; and are prepd. by a special inverse emulsion polymerisation process, in which an initial stabilised oil-in-water emulsion is converted to a water-in-oil emulsion during polymerisation by adding an inverse emulsion of the water-soluble initiator in oil or by separate addn. of an aq. soln. of the initiator and a soln. of a low HLB wetting agent in oil. USE - (I) are useful in water purificn. as flocculant for purifying industrial liquors, as sludge conditioner for municipal sewage or as dewatering agent and retention aid in paper mfr. ADVANTAGES - 100% polymerisation of both monomers is attained. The water-in-oil emulsions obtd. have low macro-viscosity and are very stable.
Language
de
Patenprio
DE 1995-19524868 A: 19950707