Method for producing a modified cationized polysaccharide, modified cationized polysaccharide and its use

Abstract

The invention relates to a method for producing a modified cationized polysaccharide. The method comprises preparing a reaction slurry by mixing of a starting material comprising a polysaccharide, preferably cellulose, and an alkaline liquid medium comprising an organic liquid, allowing the polysaccharide to interact with the alkaline liquid medium in the reaction slurry at a pre-treatment temperature under a pre-determined reaction time, and adjusting the temperature of the reaction slurry to modification temperature, which is less than the boiling point of the alkaline liquid medium. A cationizing agent and an alkylation agent, which comprises an epoxy group, are added to the reaction slurry at the modification temperature, and the polysaccharide is allowed to react with the alkylation agent and the cationizing agent, preferably under inert atmosphere, and obtaining a modified cationized polysaccharide product in solution form. The invention relates also to the modified cationized polysaccharide and its use as flocculation agent.

Dependencies are inferred from the claim text.