US3644082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of diethylaminoethyl cotton using nonaqueous solvents
Assignee: United States Department of Agriculture
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Filing: 1970-06-24
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Granted: 1972-02-22
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Expires: 1990-06-24
Abstract
Abstract Fibrous cellulosic material was impregnated with a swelling agent, solvent exchanged to remove any water present, and reacted with a solution containing sodium methoxide. This product was rinsed, then reacted with a solution containing 2chloroethyldiethylamine and washed. The finished product was a partial cellulose ether having anion exchange properties with a wide range of ion exchange capacities. By converting the finished product to the acid salt form in situ catalytic sites for crosslinking reactions are provided. In addition, the diethylaminoethylated product may be converted to the quaternary form by refluxing with methyl iodide.
Inventors
- 👤 Ralph J Berni
- 👤 Ruth R Benerito
- 👤 John B Mckelvey
- 👤 Truman L Ward
- 👤 Donald M Soignet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:18
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/325; D06M13/328; D06M13/33; D06M13/10; D06M13/144
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
The process of claim 1 wherein the swelling agent is dimethylformamide.
Claim 2
Dependent Claim
11 words
The process of claim 1 wherein the swelling agent is dimethylsulfoxide.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the swelling agent is aqueous 15-23 percent sodium hydroxide.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the swelling agent is zinc chloride.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the swelling agent is zinc bromide.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the swelling agent is tetrabutylammonium hydroxide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |