Patent US4100342A successfully refreshed from Google Patents.
US4100342A
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Process of producing dextrin carboxylates
Assignee: FMC Corp
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Filing: 1976-08-09
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Granted: 1978-07-11
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Expires: 1996-08-09
Abstract
Abstract Dextrin carboxylates having about 20 to 100 anhydroglucose units of which from about 2.2 to about 3.0 average OH groups per unit are esterified through one of the carboxyls of a non-aromatic polycarboxylic acid of 2-4 carboxyls containing 2 to 10 carbon atoms, are prepared by (1) reacting the dextrin with at least about 2.8 moles of the anhydride of the polycarboxylic acid in acetic acid in the presence of a tertiary amine catalyst and (2) adding the reaction mixture to a solvent which precipitates the dextrin carboxylate and (3) isolating the so-produced dextrin carboxylate.
Inventors
- 👤 Joseph H. Finley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:58
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/22; C11D3/222; C11D3/226; C08; C08B; C08B31/00; C08B31/02; C08B31/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
In the process of producing a dextrin carboxylate having about 20 to 100 anhydroglucose units of which from about 2.2 to about 3.0 average OH groups per unit are esterified through one of the carboxyls of a non-aromatic polycarboxylic acid of 2-4 carboxyls containing 2 to 10 carbon atoms by reacting the dextrin with at least about 2.8 moles of the anhydride of the polycarboxylic acid, the improvement comprising carrying out the reaction in acetic acid in the presence of a tertiary amine catalyst.
Claim 2
Dependent Claim
84 words
In the process of producing a dextrin carboxylate having about 20 to 100 anhydroglucose units of which from about 2.2 to about 3.0 average OH groups per unit are esterified through one of the carboxyls of a non-aromatic polycarboxylic acid of 2-4 carboxyls containing 2 to 10 carbon atoms by reacting the dextrin with at least about 2.8 moles of the anhydride of the polycarboxylic acid, the improvement comprising carrying out the reaction in acetic acid in the presence of a tertiary amine catalyst.
Claim 3
Dependent Claim
13 words
The process according to claim 1 wherein the tertiary amine catalyst is pyridine.
Claim 4
Dependent Claim
12 words
The process according to claim 1 wherein the anhydride is succinic anhydride.
Claim 5
Dependent Claim
19 words
The process according to claim 1 wherein the reaction temperature is from about 120° C to about 140° C.
References Cited (Backward Citations)
US3720663A
Cited
US3919107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |