Method for the preparation of highly substituted granular starches
AssigneeNational Starch and Chemical Corporation
InventorsMorton W. Rutenberg, Wadym Jarowenko, Martin M. Tessler
Life of this patent
Estimating the term…
Abstract
Highly substituted granular starches are prepared by reacting the starch in an aqueous system with a reagent capable of producing an acetal cross-linkage; reacting the resultant acetal cross-linked starch with a mono-functional esterifying or etherifying reagent under aqueous alkaline conditions and removing the acetal cross-linkages by treating under acid conditions. The highly substituted starches are particularly useful in operations, such as papermaking, wherein the cross-linkages can be removed and the starch readily dispersed during a relatively low pH starch cooking process.
Claims9
A process for the production of highly substituted granular starch products comprising the steps of:
- a. reacting the starch in an aqueous system with from 0.5 to 15% by dry weight of the starch of a reagent capable of producing an acetal cross-linkage;
- b. reacting said acetal cross-linked starch in an aqueous alkaline system with a mono-functional esterifying or etherifying reagent;
- and
- c. removing said acetal cross-linkages by treating under acidic conditions.
Dependencies are inferred from the claim text.