US3839320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing starch esters
Assignee: Anheuser Busch Companies LLC
•
Filing: 1973-08-06
•
Granted: 1974-10-01
•
Expires: 1993-08-06
Abstract
Abstract This application covers an improved method for producing starch esters which have food and non-food uses, and particularly relates to the production of an acetylated starch useful as a thickener and texturizing ingredient in food products. Magnesium oxide or magnesium hydroxide additive is used to maintain the pH of the reaction mixture in a range favorable in the formation of starch esters. The entire amount of the alkaline additive may be added to the reaction vessel at one time to permit the controlled addition of an organic acid anhydride. This avoids loss of the anhydride and formation of excess acid as the anhydride reacts with the starch.
Inventors
- 👤 C Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:49
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/02; C08B31/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A PROCESS FOR MAKING A STARCH ESTER PRODUCT WHICH COMPRISES REACTING GRANULAR STARCH IN SLURRY FORM WITH FROM ABOUT 1 PERCENT TO ABOUT 12 PERCENT BY WEIGHT BASED ON DRY WEIGHT OF STARCH OF AN ESTERIFICATION REAGENT SELECTED FROM MONO OR DIBASIC ORGANIC ACID ANHYDRIDE IN THE PRESNCE OF ABOUT 0.5 PERCENT TO ABOUT 3 PERCENT BY WEIGHT BASED ON THE WEIGHT OF DRY STARCH OF AN ALKALINE ADDITIVE SELECTED FROM A GROUP CONSISTING OF MAGNESIUM OXIDE AND MAGNESIUM HYDROXIDE IN THE STARCH SLURRY DURING THE ESTERIFICATION REACTION TO CONTROL THE PH IN THE RANGE OF ABOUT PH 5 TO ABOUT PH 11.5 FAVORABLE FOR THE REACTION.
Claim 2
Dependent Claim
107 words
A PROCESS FOR MAKING A STARCH ESTER PRODUCT WHICH COMPRISES REACTING GRANULAR STARCH IN SLURRY FORM WITH FROM ABOUT 1 PERCENT TO ABOUT 12 PERCENT BY WEIGHT BASED ON DRY WEIGHT OF STARCH OF AN ESTERIFICATION REAGENT SELECTED FROM MONO OR DIBASIC ORGANIC ACID ANHYDRIDE IN THE PRESNCE OF ABOUT 0.5 PERCENT TO ABOUT 3 PERCENT BY WEIGHT BASED ON THE WEIGHT OF DRY STARCH OF AN ALKALINE ADDITIVE SELECTED FROM A GROUP CONSISTING OF MAGNESIUM OXIDE AND MAGNESIUM HYDROXIDE IN THE STARCH SLURRY DURING THE ESTERIFICATION REACTION TO CONTROL THE PH IN THE RANGE OF ABOUT PH 5 TO ABOUT PH 11.5 FAVORABLE FOR THE REACTION.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein all oF the alkaline additive is added at one time.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein the starch is cross-linked.
Claim 5
Dependent Claim
105 words
The method of claim 1 which includes in the preparation of starch for food uses the steps of suspending an ungelatinized starch in water, adding to said suspension about 0.05 percent to about 0.3 percent based on the dry weight of starch of a cross-linking reagent selected from a group consisting of cross-linking polyfunctional etherification and esterification reagents to produce a cross-linked starch, adding the alkaline additive in one portion to a reaction vessel containing the said cross-linked starch to maintain the pH of the reaction mass in the range favorable for esterification and then adding an anhydride of a monobasic or dibasic organic acid.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein the anhydride reagent is selected from the group consisting of acetic, propionic, octenylsuccinic, phthalic, maleic and succinic acid anhydrides, and mixtures thereof.
Claim 7
Dependent Claim
27 words
The method of claim 1 wherein the starch is selected from a group consisting of corn, potato, waxy maize, waxy sorghum, tapioca, wheat, rice and mixtures thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |