| abstract |
Stable microdispersed polyanhydroglucuronic acid and salts thereof contain in their polymeric chain from 8 to 30 percent by weight of carboxyl groups, at least 80 percent by weight of these groups being of the uronic type, at most 5 percent by weight of carbonyl groups including intra- and inter-molecular 2,6 and 3,6 hemiacetals, 2,4-hemialdals and C2 and C3 aldehydes. The molecular mass of the polymeric chain is from 1×10 3 to 3×10 5 Daltons. The microdispersed products are prepared by subjecting a polyanhydroglucuronic acid-containing material to partial or complete hydrolysis and neutralisation in an oxidative environment. |