Patent ID: 6586588
Filing Date: 2003-07-01
Classification: C08B,D21H

Abstract:
A method for preparing polysaccharide aldehyde derivatives having maximum effective aldehyde content comprising oxidizing polysaccharide in an aqueous solution with an oxidant having an equivalent oxidizing power of up to 14.18 g of active chlorine per mole of polysaccharide anhydrosugar unit (â€œASUâ€ ) and an effective mediating amount of nitroxyl radical, the reaction being carried out at a temperature of at or less than about 15Â° C. and a pH of from about 8.0 to 10.5, the resulting product having up to 15 mole % of C-6 aldehyde groups per mole of polysaccharide ASU and aldehyde to carboxylic acid ratios of greater than or equal to 0.5 based on moles of polysaccharide ASU of each functionality.