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Staerkephosphate, Verfahren zu deren Herstellung und deren Verwendung

Preparation of highly substituted starch phosphates, useful e.g. as additive in cosmetic, comprises dissolving starch in urea-water mixture, removing water to give modified starch followed by thermally treating with phosphatizing agent
: Volkert, B.; Fischer, S.; Loth, F.; Langer, B.; Engelhardt, J.

Frontpage ()

DE 102005004600 A: 20050201
DE 2005-102005004600 A: 20050201
WO 2006-EP886 A: 20060201
DE 102005004600 B3: 20060831
Patent, Electronic Publication
Fraunhofer IAP ()

Die Erfindung betrifft ein Verfahren zur Herstellung von hochsubstituierten Staerkephosphaten mit geringem Carbamatgruppengehalt sowie ein Verfahren zu deren Herstellung. Der hohe Substitutionsgrad hinsichtlich der Phosphatgruppen bei gleichzeitig niedrigen Substitutionsgraden der Carbamatgruppen kann durch einen besonderen Vorbehandlungsschritt erreicht werden.


WO 2006082044 A1 UPAB: 20060914 NOVELTY - Preparation of a highly substituted starch phosphates comprises: dissolving the starch in a mixture of urea and water, in a pretreatment step; removing water from the obtained solution to give a modified starch; and thermally treating the modified starch with a phosphatizing agent in a solvent-free step to give starch phosphates, in a mixing unit. DETAILED DESCRIPTION - An INDEPEDNENT CLAIM is included for a starch phosphate with substitutions degree at phosphate groups of 0.01-2 and carbamate group concentration of smaller than or equal to 0.1. USE - The starch phosphate is useful as an additive: in mineral or dispersion-bound building material systems and pharmacy or cosmetic; as anionic component for polyelectrolyte complex; as carrier material, preferably in agriculture; and for binding water (claimed). ADVANTAGE - The process provides highly substituted starch phosphates (claimed), with less substituted degree of carbamate group. The process is economical and simple.