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Patent US4096325A successfully refreshed from Google Patents.
US4096325A
Expired / Lapsed
US
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Methyl hydroxypropyl cellulose ethers
Assignee: Anheuser Busch Companies LLC
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Filing: 1976-02-20
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Granted: 1978-06-20
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Expires: 1996-02-20
Abstract
Abstract This disclosure relates to the production of methyl hydroxypropyl cellulose ethers having a degree of molar substitution (M.S.) of greater than 2. The methyl hydroxypropyl cellulose ethers are prepared at low cost under mild conditions and are particularly useful in gelling organic solvents having a solubility parameter of 8 - 16. They also have compatibility for mixtures of organic solvents and water and are helpful in gelling such solutions when the percentage of water in such mixtures is up to about 60%.
Inventors
- 👤 James Teng
- 👤 Frank Dai
- 👤 Marcella C. Stubits
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:41
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/193; B; B01; B01J; B01J19/00; B01J19/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
The process which comprises treating an alkali cellulose with propylene oxide in an amount of from 1 to 8 parts by weight propylene oxide per part of cellulose at a temperature not in excess of 110° C until the propylene oxide is substantially fully reacted, and subsequently treating said cellulose with from 1 to 9 parts by weight methylating material selected from the group of methyl halides and methyl salts per part of cellulose at a temperature from 40° C to 75° C until the etherification is substantially complete, to produce a methyl hydroxypropyl cellulose ether with a degree of molar substitution of hydroxypropyl groups of 2.5 to 8 and degree of substitution of methyl groups of 1.0 to 2.4 which is able to gel an organic solvent having a solubility parameter from about 8 to about 16 or an organic solvent-water mixture in which the organic solvent has a solubility parameter from about 8 to about 16, said mixture containing less than about 60% water.
Claim 2
Dependent Claim
166 words
The process which comprises treating an alkali cellulose with propylene oxide in an amount of from 1 to 8 parts by weight propylene oxide per part of cellulose at a temperature not in excess of 110° C until the propylene oxide is substantially fully reacted, and subsequently treating said cellulose with from 1 to 9 parts by weight methylating material selected from the group of methyl halides and methyl salts per part of cellulose at a temperature from 40° C to 75° C until the etherification is substantially complete, to produce a methyl hydroxypropyl cellulose ether with a degree of molar substitution of hydroxypropyl groups of 2.5 to 8 and degree of substitution of methyl groups of 1.0 to 2.4 which is able to gel an organic solvent having a solubility parameter from about 8 to about 16 or an organic solvent-water mixture in which the organic solvent has a solubility parameter from about 8 to about 16, said mixture containing less than about 60% water.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the methylating material is methyl chloride.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the methylating material is methyl bromide.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the methylating material is dimethyl sulfate.
Claim 6
Dependent Claim
59 words
A cellulose ether having a degree of molar substitution of hydroxypropyl groups of 2.5 to 8 and a degree of substitution of methyl groups of 1.0 to 2.4 which can gel an organic solvent-water mixture in which the organic solvent has a solubility parameter from about 8 to about 16 and said mixture contains less than about 60% water.
Claim 7
Dependent Claim
59 words
A cellulose ether having a degree of molar substitution of hydroxypropyl groups of 2.5 to 8 and a degree of substitution of methyl groups of 1.0 to 2.4 which can gel an organic solvent-water mixture in which the organic solvent has a solubility parameter from about 8 to about 16 and said mixture contains less than about 60% water.
References Cited (Backward Citations)
US2265913A
Cited
US2306451A
Cited
US2831852A
Cited
DE1222030B
Cited
US3251824A
Cited
US3278521A
Cited
US3453261A
Cited
US3388082A
Cited
US3709876A
Cited
US3839319A
Cited
US3926951A
Cited
US3940384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |