Graft polymers of keto-aldehyde condensation or...

C - Chemistry – Metallurgy – 08 – F

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C08F 283/00 (2006.01) B01F 17/00 (2006.01) B01F 17/52 (2006.01) C04B 24/16 (2006.01) C04B 24/30 (2006.01) C08F 283/06 (2006.01) C08F 289/00 (2006.01) C09K 3/00 (2006.01) C09K 8/12 (2006.01) C09K 8/24 (2006.01) C09K 8/60 (2006.01) C10L 1/32 (2006.01)

Patent

CA 2165965

Graft polymers of ketone-aldehyde condensation and co-condensation products and/or the monovalent or polyvalent metal compounds thereof are described, in which condensation product consists a) of symmetrical or asymmetrical ketones containing aliphatic, araliphatic, cyclic or aromatic hydro- carbon radicals with at least one nonaromatic radical, b) an aldehyde of the formula R-(CHO)n, wherein n = 1 to 2 and R can be hydrogen or an aliphatic, aralipha- tic, aromatic or heterocyclic radical, and c) optionally of carboxyl, sulpho, sulphamido, sulphoxy, sulphoalkylamine or sulphoalkyloxy groups, to which product anionic and/or nonionic and/or cationic unsaturated monomers have been grafted. These graft polymers are outstandingly suitable as dispersants for inorganic binder suspensions and solutions, for aqueous clay suspensions and solutions or coal/water suspensions, as retention agents, thickeners, in particular for aqueous systems, and as agents for preventing the swelling of clay in aqueous systems.

Il est décrit des polymères greffés de produits de condensation cétone-aldéhyde ou de produits de co-condensation et/ou de leurs combinaisons metalliques monovalentes ou polyvalentes, caractérisés en ce que le produit de condensation est constitué par a) des cétones symétriques ou asymétriques avec des restes hydrocarbures aliphatiques, araliphatiques, cycliques ou aromatiques, y compris au moins un reste non aromatique, b) un aldéhyde de formule R-(CHO)n, dans laquelle n = 1 à 2, et R peut être un reste aliphatique, araliphatique, aromatique ou hétérocyclique, et c) éventuellement des groupes carboxy, sulfo, sulfamido, sulfoxy, sulfoalkylamine ou sulfoalkyloxy, et en ce qu'à ce produit de condensation sont greffés des monomères insaturés anioniques et/ou non ioniques et/ou cationiques. Ces polymères greffés conviennent remarquablement bien comme agents dispersants pour des suspensions et des solutions de liants anorganiques, pour des suspensions et des solutions aqueuses d'argile ou des suspensions de charbon dans l'eau, comme agents de rétention, épaississants, en particulier pour des systèmes aqueux, et comme agents empêchant le gonflement de l'argile dans des systèmes aqueux.

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