Staerkephosphate, Verfahren zu deren Herstellung und deren Verwendung

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