US4219646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing cross-linked starches using STMP
Assignee: Ingredion Inc
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Filing: 1979-03-19
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Granted: 1980-08-26
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Expires: 1999-03-19
Abstract
Abstract The invention discloses a dual derivatizing process for the preparation of cold water swelling starches and foodstuffs thickened therewith. The starch base is first subjected to a primary crosslinking reaction using sodium trimetaphosphate (STMP) according to conventional techniques, then reslurried, treated with additional STMP and drum dried to effect a secondary crosslinking reaction in situ.
Inventors
- 👤 Roger W. Rubens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:32
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/003
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
84 words
A dual derivatizing process for the preparation of cold water swelling starches comprising the steps of: 1. reacting a granular starch base in a primary crosslinking step with sodium trimetaphosphate in an amount of 0.01 to 0.6%, based on the dry weight of the starch, in an aqueous slurry at a pH of 10-12 and a temperature sufficiently low to maintain the starch in an unswollen granular state; 2. neutralizing the slurry to a pH of 5-6.5; 3. recovering the primary crosslinked granular starch;
Claim 2
Dependent Claim
84 words
A dual derivatizing process for the preparation of cold water swelling starches comprising the steps of: 1. reacting a granular starch base in a primary crosslinking step with sodium trimetaphosphate in an amount of 0.01 to 0.6%, based on the dry weight of the starch, in an aqueous slurry at a pH of 10-12 and a temperature sufficiently low to maintain the starch in an unswollen granular state; 2. neutralizing the slurry to a pH of 5-6.5; 3. recovering the primary crosslinked granular starch;
Claim 3
Dependent Claim
56 words
reslurrying the resultant starch in water at a pH of at least 7.5 and adding thereto additional sodium trimetaphosphate in an amount of 0.01-0.6%, based on the dry weight of the starch; 5. drum drying the resultant slurry to effect a secondary crosslinking reaction in situ; and 6. recovering the dried cold water swelling starch product.
Claim 4
Dependent Claim
56 words
reslurrying the resultant starch in water at a pH of at least 7.5 and adding thereto additional sodium trimetaphosphate in an amount of 0.01-0.6%, based on the dry weight of the starch; 5. drum drying the resultant slurry to effect a secondary crosslinking reaction in situ; and 6. recovering the dried cold water swelling starch product.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the starch base is corn, waxy maize or tapioca.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the primary crosslinking reaction is performed at a pH of 11 to 11.5.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein the primary crosslinking reaction is performed at a temperature of 30° to 50° C.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein the granular crosslinked starch resulting from the primary reaction is reslurried in water at a pH of 7.8-8.1.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the drum drying step is carried out at a temperature of 135°-175° C.
Claim 10
Dependent Claim
25 words
The process of claim 1 wherein the total sodium ion concentration in both crosslinking reactions is maintained at about 0.4 mole per liter of slurry.
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) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |