Polymer composition and a method for producing the same

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 290/06 (2006.01) A61L 15/60 (2006.01) B01J 20/26 (2006.01) C08F 220/04 (2006.01) C08F 220/06 (2006.01) C08F 251/00 (2006.01) C08F 261/04 (2006.01) C08L 51/00 (2006.01)

Patent

CA 2387516

The invention relates to powder-form, cross-linked polymer compositions containing the following: a) 55-99.9 wt. % of at least one polymerised, ethylenically unsaturated, polymerisable monomer containing acid groups, said monomer(s) being neutralised to at least 25 mol. %; b) 0-40 wt. % polymerised, unsaturated monomers that are copolymerisable with a); c) 0.01-5.0, preferably 0.1-2.0 wt. % of one or more cross-linking agents; and d) 0-30 wt. % of a water-soluble polymer, the proportions by weight a) to d) being in relation to the water-free polymerizate composition and the sum of the components always being 100 wt. %. The inventive compositions can be obtained by continuous polymerisation during which at least one parameter that influences the polymerisation is varied according to a recurrent pattern. The invention also relates to a method for producing the inventive polymer compositions and to their use.

La présente invention concerne des compositions polymères pulvérulentes, réticulées contenant a) 55-99,9 % en poids d'au moins un monomère polymérisé, éthyléniquement insaturé, polymérisable, contenant des groupes acides et neutralisé au moins à 25 % en moles; b) 0-40 % en poids de monomères polymérisés insaturés, copolymérisables avec a); c) 0,01-5,0, de préférence 0,1-2,0 % en poids d'au moins un agent de réticulation; d) 0-30 % en poids d'un polymère soluble dans l'eau. Les quantités a) à d) se rapportent à la composition polymère sans eau et la somme de ces composantes donne toujours 100 % en poids. Ces compositions sont obtenues par polymérisation continue, selon laquelle au moins un paramètre influençant la polymérisation est modifié selon un motif récurrent. La présente invention concerne également leur procédé de production et leur utilisation.

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