Compositions: coating or plastic – Coating or plastic compositions – Carbohydrate or derivative containing
Patent
1994-06-21
1995-05-23
Green, Anthony
Compositions: coating or plastic
Coating or plastic compositions
Carbohydrate or derivative containing
106213, 106214, 536105, C08L 302
Patent
active
054177553
ABSTRACT:
An amphoteric starch containing carboxyl and cationic groups 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. The process for producing the amphoteric starch 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.
REFERENCES:
patent: 3598623 (1971-08-01), Powers et al.
patent: 3649624 (1972-03-01), Powers et al.
patent: 3654263 (1972-04-01), Cescato
patent: 3706584 (1972-12-01), Cescato
K. M. Reeve and K. M. Dear, "Oxidation With Hydrogen Peroxide and Hydrogen Peroxide", Indus. Chem Lib. vol. 3, pp. 127-134 (1991) [No Month].
"Benzene, Its Derivatives, and Condensed Benzenoid Compounds", Chem. Abtracts, vol. 116, No. 11, Mar. 16, 1992, p. 25.
Copy of French Search Report, dated Dec. 2, 1992.
Defaye Jacques
Gadelle Andree
Kervennal Jacques
Suc Sophie
Elf Atochem S.A.
Green Anthony
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