US4228277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified nonionic cellulose ethers
Assignee: Aqualon Co
•
Filing: 1979-02-12
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Granted: 1980-10-14
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Expires: 1999-02-12
Abstract
Abstract Cellulose ethers are disclosed which have sufficient nonionic substitution to render them water soluble and which are further modified with a C10 to C24 long chain alkyl group in an amount between about 0.2% by weight and the amount which makes them less than 1% soluble in water. Hydroxyethyl cellulose is a preferred water-soluble cellulose ether for modification according to the invention. These products exhibit substantially improved viscosifying effect compared to their unmodified cellulose ether counterparts and also exhibit some surface activity.
Inventors
- 👤 Leo M. Landoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:52
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/193
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A nonionic cellulose ether having a sufficient degree of nonionic substitution selected from the class consisting of methyl, hydroxyethyl and hydroxypropyl to cause it to be water-soluble and being further substituted with a long chain alkyl radical having 10 to 24 carbon atoms in an amount between about 0.2 weight percent and the amount which renders said cellulose ether less than 1% by weight soluble in water.
Claim 2
Dependent Claim
67 words
A nonionic cellulose ether having a sufficient degree of nonionic substitution selected from the class consisting of methyl, hydroxyethyl and hydroxypropyl to cause it to be water-soluble and being further substituted with a long chain alkyl radical having 10 to 24 carbon atoms in an amount between about 0.2 weight percent and the amount which renders said cellulose ether less than 1% by weight soluble in water.
Claim 3
Dependent Claim
19 words
The nonionic cellulose ether of claim 1 wherein the long chain alkyl radical is attached via an ether linkage.
Claim 4
Dependent Claim
40 words
Water-soluble hydroxypropyl cellulose substituted with a long chain alkyl radical having 10 to 24 carbon atoms in an amount between about 0.2 weight percent and the amount which renders the hydroxypropyl cellulose less than 1% by weight soluble in water.
Claim 5
Dependent Claim
40 words
Water-soluble hydroxypropyl cellulose substituted with a long chain alkyl radical having 10 to 24 carbon atoms in an amount between about 0.2 weight percent and the amount which renders the hydroxypropyl cellulose less than 1% by weight soluble in water.
Claim 6
Dependent Claim
40 words
Water-soluble hydroxyethyl cellulose substituted with a long chain alkyl radical having 10 to 24 carbon atoms in an amount between about 0.2 weight percent and the amount which renders the hydroxyethyl cellulose less than 1% by weight soluble in water.
Claim 7
Dependent Claim
40 words
Water-soluble hydroxyethyl cellulose substituted with a long chain alkyl radical having 10 to 24 carbon atoms in an amount between about 0.2 weight percent and the amount which renders the hydroxyethyl cellulose less than 1% by weight soluble in water.
Claim 8
Dependent Claim
27 words
The product of claim 3 wherein the hydroxyethyl cellulose prior to substitution with the long chain alkyl group has a molecular weight of about 50,000 to 400,000.
Claim 9
Dependent Claim
17 words
The product of claim 5 wherein the long chain alkyl group is attached via an ether linkage.
References Cited (Backward Citations)
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US3435027A
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |