C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 220/02 (2006.01) C04B 24/26 (2006.01) C08F 216/14 (2006.01) C08F 222/00 (2006.01)
Patent
CA 2628740
Copolymers based on unsaturated monocarboxylic or dicarboxylic acid derivatives, oxyalkylene glycol alkenyl ethers and, if appropriate, vinylic polyalkylene glycol or ester compounds and also their use as additives for aqueous suspensions based on mineral or bituminous binders, in particular cement, plaster of Paris, lime, anhydrite or other binders based on calcium sulphate, and also those based on pulverulent dispersion binders are described. The copolymers of the invention give the aqueous binder suspensions a very good dispersing or fluidizing action combined with excellent processing properties. In addition, the oxyalkylene glycol alkenyl ethers used according to the invention can be produced industrially relatively simply and cheaply and require comparatively low initiator concentrations in the copolymerization.
L'invention concerne des copolymères à base de dérivés d'acides monocarboxyliques ou dicarboxyliques insaturés, d'éthers alcényliques d'oxyalkylène glycol, ainsi que le cas échéant de composés esters ou polyalkylène glycol, ainsi que leur utilisation en tant qu'additifs dans des suspensions aqueuses à base de liants minéraux ou bitumineux, notamment de ciment, de gypse, de calcaire, d'anhydrite ou autre liant à base de sulfate de calcium, ainsi qu'à base d'un liant pour dispersion pulvérulent. Les copolymères selon l'invention confèrent aux suspensions aqueuses de liant un très bon pouvoir liquéfiant ou dispersant, ainsi que d'excellentes propriétés de mise en oevre. En outre, les éthers alcényliques d'oxyalkylène glycol utilisés selon l'invention sont relativement simples techniquement et économiques à fabriquer et nécessitent une concentration d'amorceurs relativement faible pour la copolymérisation.
Albrecht Gerhard
Lorenz Klaus
Scholz Christian
Wagner Petra
Construction Research & Technology Gmbh
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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