US4040862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a thermal converting starch by modification of oxidized starch with aluminum salts
Assignee: Anheuser Busch Companies LLC
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Filing: 1976-07-02
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Granted: 1977-08-09
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Expires: 1996-07-02
Abstract
Abstract Process for preparing a thermal converting starch by reacting an alkaline hypochlorite oxidized starch with a water soluble aluminum salt. The treatment provides a starch product which when pasted at high temperatures will degrade to give a low viscosity material. The process includes the steps of slurrying oxidized starch in water and treating the oxidized starch with a water soluble aluminum salt.
Inventors
- 👤 John E. Voigt
- 👤 Edward M. Bovier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:52
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/18; C08B31/185; D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/54
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A process for preparing starch for use in paper coating compositions comprising the steps of: a. forming an aqueous slurry of an unmodified starch, b. oxidizing said starch to a degree equivalent to that obtained by oxidizing with about 1.0 to about 2.0% available chlorine, c. adding a water-soluble aluminum salt to said oxidized starch, and d. adjusting the pH to about 6 to about 7.
Claim 2
Dependent Claim
66 words
A process for preparing starch for use in paper coating compositions comprising the steps of: a. forming an aqueous slurry of an unmodified starch, b. oxidizing said starch to a degree equivalent to that obtained by oxidizing with about 1.0 to about 2.0% available chlorine, c. adding a water-soluble aluminum salt to said oxidized starch, and d. adjusting the pH to about 6 to about 7.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the water-soluble aluminum salt is selected from the group consisting of aluminum chloride, aluminum sulfate, and the alums.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein about 0.1% to about 1.0% (w/w) water-soluble aluminum salt, based on the weight of dry starch, is added.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the starch oxidizing agent is selected from the group consisting of sodium hypochlorite and calcium hypochlorite.
Claim 6
Dependent Claim
86 words
A process for preparing starch for use in paper coating compositions comprising the steps of: a. forming an aqueous slurry containing about 20 to about 43% by weight of an unmodified starch, b. oxidizing said starch to a degree equivalent to that obtained by oxidizing with about 1.0 to about 2.0% available chlorine, c. adding about 0.1 to about 1.0% (w/w) water-soluble aluminum salt, based on the weight of dry starch, to said oxidized starch, and d. adjusting the pH to about 6.0 to about 7.0.
Claim 7
Dependent Claim
86 words
A process for preparing starch for use in paper coating compositions comprising the steps of: a. forming an aqueous slurry containing about 20 to about 43% by weight of an unmodified starch, b. oxidizing said starch to a degree equivalent to that obtained by oxidizing with about 1.0 to about 2.0% available chlorine, c. adding about 0.1 to about 1.0% (w/w) water-soluble aluminum salt, based on the weight of dry starch, to said oxidized starch, and d. adjusting the pH to about 6.0 to about 7.0.
Claim 8
Dependent Claim
23 words
The process of claim 5 including the step of pasting the starch after the pH has been adjusted to between 6.0 and 7.0.
Claim 9
Dependent Claim
32 words
The process of claim 6 wherein the aluminum treated oxidized starch is dewatered after the pH has been adjusted to between 6.0 and 7.0, and then reslurried in water prior to pasting.
Claim 10
Dependent Claim
75 words
A process for preparing starch for use in paper coating compositions comprising the steps of: a. forming an aqueous slurry of an unmodified starch, b. oxidizing said starch to a degree equivalent to that obtained by oxidizing with about 1.0 to about 2.0% available chlorine, c. washing, filtering, drying said oxidized starch, d. dry blending a water-soluble aluminum salt with said dried oxidized starch, and e. adjusting the pH to about 6 to about 7.
Claim 11
Dependent Claim
75 words
A process for preparing starch for use in paper coating compositions comprising the steps of: a. forming an aqueous slurry of an unmodified starch, b. oxidizing said starch to a degree equivalent to that obtained by oxidizing with about 1.0 to about 2.0% available chlorine, c. washing, filtering, drying said oxidized starch, d. dry blending a water-soluble aluminum salt with said dried oxidized starch, and e. adjusting the pH to about 6 to about 7.
Claim 12
Dependent Claim
24 words
The process of claim 1 wherein the aqueous slurry of unmodified starch contains about 20 to about 43% by weight of the unmodified starch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |