Process for the oxidation of cationic starches and amphoteric st

Details Process for the oxidation of cationic starches and amphoteric st Process for the oxidation of cationic starches and amphoteric st

1993-03-22

1995-01-24

Green, Anthony

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

106213, 106214, 426661, 536105, C08B 3118

Patent

active

053839641

ABSTRACT:
This process consists in reacting a cationic starch in aqueous solution with hydrogen peroxide and hydrobromic acid or bromine, so as to oxidize selectively the hemiacetal groups of the cationic starch and, where appropriate, the hemiacetal groups of its products of acid hydrolysis, to give carboxyl groups. The amphoteric starch containing carboxyl and cationic groups, thus obtained, is characterized in that its carboxyl groups originate from the selective oxidation of the hemiacetal groups of the cationic starch and possibly of the hemiacetal groups of its products of acid hydrolysis.

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Copy of French Search Report, dated Dec. 02, 1992.

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