Patent ID: 7166305

Claim:
A starch-polyvalent metal derivative comprising starch granules selected from the group consisting of wheat, waxy wheat, corn, waxy corn, high amylose corn, oat, rice, tapioca, mung bean, and potato starches and mixtures thereof which are prepared by initially expanding starch granules in water, reacting the expanded granules first with a cross-linking agent selected from the group consisting of sodium trimetaphosphate, sodium tripolyphosphate, phosphoryl chloride, eplchiorohydrin and mixtures thereof, and then with an agent to bond or attach hydrophobic moieties to the surface of the granules, said moieties derived from hydrophobic acids and acid anhydrides, and thereafter reacting the reacted granules with a polyvalent metal, selected from the group consisting of Groups 2–13, inclusive, of the Periodic Table, said starch derivative being rapidly dispersible in both hot and cold water.