Modified starch

Claim 1

A PROCESS WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF 40% TAPIOCA STACH; TREATING SAID SLURRY WITH HYDROCHLORIDE ACID TO PROVIDE A PEAK VISCOSITY OF 500 B.U.; INCORPORATING 5% SODIUM SULFATE AND A 5% SODIUM HYDROXIDE SOLUTION INTO SAID ACID-TREATED SLURRY TO FORM A PH OF 10.5; REACTING THE STARCH IN SAID SLURRY WITH 8% PROPYLENE OXIDE; REACTING SAID PROPYLENE OXIDE-REACTED STARCH WITH 0.03% PHOSPHORUS OXUCHLORIDE; AND RECOVERING AN UNGELATINIZED MODIFIED STARCH THEREFROM BY NEUTRALIZING WITH HYDROCHLORIDE ACID TO A PH OF 5.0, DILUTING WITH WATER, DECANTING, CENTRIFUGING AND DRYING; SAID RECOVERED UNGELATINIZED MODIFIED STARCH HAVING A VISCOSITY OF 1070 B.U. BY VARYING THE AMOUNT OF ACID OF PROPYLENE THE ACID TREATMENT, BY VARYING THE AMOUNT OF PROPYLENE OXIDE EMPLOYED DURING THE PROPYLENE OXIDE REACTION AND BY VARYING THE AMOUNT OF PHOSPHORUS OXYCHLORIDE DURING THE PHOSPHROUS OXYCHLORIDE REACTION AND HAVING ACID STABILITY, HEATING STABILITY, FREEZE-THAW STABILITY AND LACK OF RETROGRADATION.