Patent US4169945A successfully refreshed from Google Patents.
US4169945A
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Process for production of polygalactomannan ethers
Assignee: Stein Hall and Co Inc
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Filing: 1978-01-05
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Granted: 1979-10-02
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Expires: 1998-01-05
Abstract
Abstract This invention provides an improved process for producing alkyl ethers of polygalactomannan gum by contacting polygalactomannan gum with alkyl halide in the presence of a metal hydroxide catalyst and a quaternary ammonium phase-transfer agent.
Inventors
- 👤 Andrea A. DeGuia
- 👤 Robert W. Stackman
- 👤 Anthony B. Conciatori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:03
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/006; C08B37/0087; C08B37/0093; C08B37/0096; Y; Y10; Y10S; Y10S507/00; Y10S507/922
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
In a process for preparing alkyl ethers of polygalactomannan gum by the reaction of polygalactomannan gum with alkyl halide, the improvement which comprises reacting polygalactomannan gum with an alkyl halide in the presence of (1) at least a stoichiometric quantity of a strongly basic metal hydroxide, based on the weight of alkyl halide, and (2) between about 0.05 and 5 weight percent of a non-reactive water-soluble quaternary ammonium halide phase-transfer agent, based on the weight of polygalactomannan gum; in an aqueous reaction medium at a temperature between about 10° C. and 100° C. for a reaction period sufficient to achieve a degree of substitution by alkyl ether groups between about 0.01 and 3.0.
Claim 2
Dependent Claim
113 words
In a process for preparing alkyl ethers of polygalactomannan gum by the reaction of polygalactomannan gum with alkyl halide, the improvement which comprises reacting polygalactomannan gum with an alkyl halide in the presence of (1) at least a stoichiometric quantity of a strongly basic metal hydroxide, based on the weight of alkyl halide, and (2) between about 0.05 and 5 weight percent of a non-reactive water-soluble quaternary ammonium halide phase-transfer agent, based on the weight of polygalactomannan gum; in an aqueous reaction medium at a temperature between about 10° C. and 100° C. for a reaction period sufficient to achieve a degree of substitution by alkyl ether groups between about 0.01 and 3.0.
Claim 3
Dependent Claim
14 words
A process in accordance with claim 1 wherein the polygalactomannan gum is guar gum.
Claim 4
Dependent Claim
15 words
A process in accordance with claim 1 wherein the polygalactomannan gum is locust bean gum.
Claim 5
Dependent Claim
18 words
A process in accordance with claim 1 wherein the polygalactomannan gum is in solid form during the process.
Claim 6
Dependent Claim
19 words
A process in accordance with claim 1 wherein the alkyl halide contains between one and about twenty carbon atoms.
Claim 7
Dependent Claim
18 words
A process in accordance with claim 1 wherein the strongly basic metal hydroxide is an alkali metal hydroxide.
Claim 8
Dependent Claim
18 words
A process in accordance with claim 1 wherein the quaternary ammonium halide phase transfer agent is tetramethylammonium chloride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |