Prepn. of alkylation deriv. of starch - by dry reaction with sodium hydroxide mono:hydrate followed by alkylation

Starch derivs. are prepd. by (a) allowing NaOH, H2O, with grain size 0.3-0.01 mm., to act on native starch with a natural or slightly reduced water content, in a dry and finely divided state, for 1-20 mins. at 5-80 degrees C., followed by (b) alkylation. Use of large amts. of water or organic solven...

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Bibliographic Details
Main Authors GARDENIER,KARL-JOSEF, HEIMBUERGER,WOLFGANG
Format Patent
LanguageEnglish
German
Published 17.07.1980
Edition3
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
DERIVATIVES THEREOF
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
POLYSACCHARIDES
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:Starch derivs. are prepd. by (a) allowing NaOH, H2O, with grain size 0.3-0.01 mm., to act on native starch with a natural or slightly reduced water content, in a dry and finely divided state, for 1-20 mins. at 5-80 degrees C., followed by (b) alkylation. Use of large amts. of water or organic solvent is avoided. The starch does not become pasty. Starch derivs. are obtd. directly in powder form. The prods. are used as thickeners and bonding agents for aq. systems, in pharmaceutical prepns., as textile aids, and as paper size.
Bibliography:Application Number: DE19792900073