Process for the preparation of finely divided,...

Details Process for the preparation of finely divided,... Process for the preparation of finely divided,...

C - Chemistry, Metallurgy

08

F

C08F 251/00 (2006.01)

Patent

CA 2054649

23443-464 ABSTRACT A novel process for preparing polysaccharide graft polymers by semicontinuous reverse-phase suspension polymerisation, partial dewatering and crosslinking is disclosed. The process comprises continuously adding an aqueous solution of at least par- tially neutralised, olefinically unsaturated carboxylic acid to a suspension of a polysaccharide in a nonpolar solvent, in the presence of a dispersant. After from 75 to 100% of the solution have been added, an additional dispersant is added to reduce the viscosity of the suspension. The additional dispersant is a compound selected from the group consisting of amphoteric ammonium compounds containing a (C6 - C20)alkyl radical, quaternary imidazolinium salts containing a (C6 - C20)alkyl radical and mix- tures thereof. The process provides a uniformly fine product having a narrow particle size distribution and high absorbency for water and body fluids. The product is particularly useful for incorporation into cellular, sorptive hygiene articles, such as disposable nappies, sanitary towels and patient undersheets.

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