US4243802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surfactant-soluble cellulose derivatives
Assignee: Aqualon Co
•
Filing: 1979-06-06
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Granted: 1981-01-06
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Expires: 1999-06-06
Abstract
Abstract Cellulose ethers containing an amount of hydroxypropyl, hydroxyethyl, or methyl radicals such that they are normally water soluble are further modified with C12 to C24 hydrocarbon radicals to a level at which they are water insoluble. These modified ethers are soluble in surfactants and effect substantial viscosity increases in solutions of surfactants. They also are highly effective emulsifiers in aqueous systems.
Inventors
- 👤 Leo M. Landoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:30
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/193
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
A cellulose ether having a sufficient degree of nonionic substitution selected from the class consisting of methyl, hydroxyethyl, and hydroxypropyl radicals to cause it to be normally soluble in water and which is further substituted with a long chain alkyl radical having 10 to 24 carbon atoms in an amount between that which renders said ether water-insoluble and about 8% by weight based on the total weight of the modified cellulose ether.
Claim 2
Dependent Claim
72 words
A cellulose ether having a sufficient degree of nonionic substitution selected from the class consisting of methyl, hydroxyethyl, and hydroxypropyl radicals to cause it to be normally soluble in water and which is further substituted with a long chain alkyl radical having 10 to 24 carbon atoms in an amount between that which renders said ether water-insoluble and about 8% by weight based on the total weight of the modified cellulose ether.
Claim 3
Dependent Claim
24 words
A water-insoluble cellulose ether of claim 1 wherein the normally soluble cellulose ether prior to modification has a D.P. of about 75 to 1800.
Claim 4
Dependent Claim
16 words
A cellulose ether of claim 2 wherein the nonionic substitution is comprised of the hydroxyethyl radical.
Claim 5
Dependent Claim
16 words
A cellulose ether of claim 2 wherein the nonionic substitution is comprised of the hydroxypropyl radical.
Claim 6
Dependent Claim
16 words
A cellulose ether of claim 2 wherein the nonionic substitution is comprised of the methyl radical.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |