US3615786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simultaneously oxidizing starch with a hypohalite and air
Assignee: Unilever Bestfoods North America
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Filing: 1970-02-16
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Granted: 1971-10-26
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Expires: 1990-02-16
Abstract
Abstract Covers a method of oxidizing starch. Particularly covers a method of oxidizing starch by first forming a basic aqueous slurry of starch, and then oxidizing said starch in slurry form by treatment with dual oxidants comprising an alkali metal hypohalite, such as sodium hypochlorite, and a source of oxygen. In a preferred embodiment the oxidation is carried out by addition of an alkali metal hypohalite, such as sodium hypochlorite to the starch slurry and by bubbling in air through the alkali metal hypohalite-treated starch slurry during the oxidation reaction. The oxidized granular starch product can be recovered in dry form and is particularly useful as a binder in a paper-coating composition.
Inventors
- 👤 Jerry A Moskaluk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:02
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
A process as defined by claim 1 wherein simultaneous treating and bubbling is effected throughout the entire oxidation.
Claim 2
Dependent Claim
12 words
A process as defined by claim 1 wherein said gas is air.
Claim 3
Dependent Claim
13 words
A process as defined by claim 1 wherein said hypohalite is sodium hypochlorite.
Claim 4
Dependent Claim
10 words
The product prepared by the process defined by claim 1.
Claim 5
Dependent Claim
134 words
A process for preparing a granular oxidized starch that is useful as a pigment binder in a paper-coating composition comprising subjecting raw granular waxy milo starch, that is first suspended in an aqueous slurry containing from about 25 to about 35 percent by weight of starch solids, dry basis, at a pH in the range from about 8 to about 12, and a temperature in the range from about 100* to about 120* F. to the oxidizing action of from about 1 to about 8 percent by weight of sodium hypochlorite, based on starch solids, dry weight basis; simultaneously bubbling air through said slurry to complement the oxidizing action of the hypochlorite and to agitate said slurry; neutralizing the residual hypochlorite at the conclusion of the oxidation; and recovering a granular oxidized starch product.
References Cited (Backward Citations)
US2354838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |