US3719503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing cmc gels
Assignee: Hercules LLC
•
Filing: 1970-11-25
•
Granted: 1973-03-06
•
Expires: 1990-11-25
Abstract
Abstract CMC gels are prepared at controlled duration of gelation by mixing together (a) a water solution of certain chelated aluminum salts adjusted to a pH of 4.5 - 9.0, and (b) a water solution of CMC, the pH of the final mixture being about 4.5 - 7.0. Preferred aluminum salts are aluminum sulfate, sodium, potassium or ammonium alum. Citric acid and its sodium, potassium and other water soluble salts are preferred as chelants.
Inventors
- 👤 T Podlas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:05
CPC Classifications
A; A23; A23L; A23L29/00; A23L29/20; A23L29/206; A23L29/262
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
189 words
Process of preparing a gel which comprises mixing the following ingredients, the gelling action being controlled so as to be effected at any time desired over a substantial period of time after said ingredieNts are mixed: (a) a first water solution comprising (1) aqueous aluminum sulfate, or an aqueous sodium, potassium or ammonium alum, the aluminum concentration being about 0.1 - 5 percent by weight of (a), (2) an aluminum chelant, the chelant/aluminum molar ratio being about 0.2 - 0.9, and (3) a base in an amount sufficient to adjust the pH of said first water solution to 4.5 - 9.0, and (b) a second water solution comprising aqueous carboxymethylcellulose having a concentration of about 0.25 -7.0 percent by weight of (b), the relative proportions of (a) and (b) employed being such as to provide in the final mixture thereof a molar ratio of aluminum atoms to anionic functional groups in the carboxymethylcellulose of about 0.05 - 1.2, and a carboxymethylcellulose content of about 0.2 - 5.0 percent by weight of the total water present, and then adjusting the final mixture to a pH of about 4.5 - 7.0.
Claim 2
Dependent Claim
189 words
Process of preparing a gel which comprises mixing the following ingredients, the gelling action being controlled so as to be effected at any time desired over a substantial period of time after said ingredieNts are mixed: (a) a first water solution comprising (1) aqueous aluminum sulfate, or an aqueous sodium, potassium or ammonium alum, the aluminum concentration being about 0.1 - 5 percent by weight of (a), (2) an aluminum chelant, the chelant/aluminum molar ratio being about 0.2 - 0.9, and (3) a base in an amount sufficient to adjust the pH of said first water solution to 4.5 - 9.0, and (b) a second water solution comprising aqueous carboxymethylcellulose having a concentration of about 0.25 -7.0 percent by weight of (b), the relative proportions of (a) and (b) employed being such as to provide in the final mixture thereof a molar ratio of aluminum atoms to anionic functional groups in the carboxymethylcellulose of about 0.05 - 1.2, and a carboxymethylcellulose content of about 0.2 - 5.0 percent by weight of the total water present, and then adjusting the final mixture to a pH of about 4.5 - 7.0.
Claim 3
Dependent Claim
207 words
Process of preparing a gel which comprises mixing the following ingredients, the gelling action being controlled so as to be effected at any time desired over a substantial period of time after said ingredients are mixed: (a) a first water solution comprising (1) aqueous aluminum sulfate, or an aqueous sodium, potassium or ammonium alum, the aluminum concentration being about 0.1 - 5 percent by weight of (a), (2) an aluminum chelant, the chelant/aluminum molar ratio being about 0.2 - 0.9, and (3) a base in an amount sufficient to adjust the pH of said first water solution to 4.5 - 9.0, and (b) a second water solution comprising (1) aqueous carboxymethylcellulose having a concentration of about 0.25 -7.0 percent by weight of (b), and (2) a base or acid in an amount sufficient to adjust the pH of said second water solution to about 4.0 - 7.5, the relative proportions of (a) and (b) employed being such as to provide in the final mixture thereof a molar ratio of aluminum atoms to anionic functional groups in the carboxymethylcellulose of about 0.05 - 1.2, a carboxymethylcellulose content of about 0.2 - 5.0 percent by weight of the total water present, and a pH of about 4.5 - 7.0.
Claim 4
Dependent Claim
207 words
Process of preparing a gel which comprises mixing the following ingredients, the gelling action being controlled so as to be effected at any time desired over a substantial period of time after said ingredients are mixed: (a) a first water solution comprising (1) aqueous aluminum sulfate, or an aqueous sodium, potassium or ammonium alum, the aluminum concentration being about 0.1 - 5 percent by weight of (a), (2) an aluminum chelant, the chelant/aluminum molar ratio being about 0.2 - 0.9, and (3) a base in an amount sufficient to adjust the pH of said first water solution to 4.5 - 9.0, and (b) a second water solution comprising (1) aqueous carboxymethylcellulose having a concentration of about 0.25 -7.0 percent by weight of (b), and (2) a base or acid in an amount sufficient to adjust the pH of said second water solution to about 4.0 - 7.5, the relative proportions of (a) and (b) employed being such as to provide in the final mixture thereof a molar ratio of aluminum atoms to anionic functional groups in the carboxymethylcellulose of about 0.05 - 1.2, a carboxymethylcellulose content of about 0.2 - 5.0 percent by weight of the total water present, and a pH of about 4.5 - 7.0.
References Cited (Backward Citations)
US2733156A
Cited
US3049433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |