PROCESS FOR THE OXIDATION OF CATIONIC STARCHES; AMPHOTERIC CARBOXYLIC AND CATIONIC STARCHES THUS PRODUCED

摘要

This process consists in reacting, in aqueous solution, a cationic starch with hydrogen peroxide and hydrogen bromide or bromine, so as to selectively oxidizing the hemiacetal groups of the cationic starch and optionally the hemiacetal groups of its products of acid hydrolysis, to carboxylic groups. The carboxylic and cationic amphoteric starch thus obtained is characterized in that its carboxylic groups originate from the selective oxidation of the hemiacetal groups of the cationic starch and possibly of hemiacetal groups of its products of acid hydrolysis.