US4486335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxymethyl hydroxyethyl cellulose composition
Assignee: Aqualon Co
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Filing: 1982-08-30
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Granted: 1984-12-04
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Expires: 2002-08-30
Abstract
Abstract A water-soluble carboxymethyl hydroxyethyl cellulose having a carboxymethyl degree of substitution of about 0.1 to about 0.25, preferably of about 0.15 to about 0.20, and having a hydroxyethyl molar substitution of greater than about 1.0 possesses unexpected qualities. When this composition is crosslinked with a suitable aluminum ion in an aqueous solution it forms a gel which exhibits no significant thinning at temperatures less than about 200° F.
Inventors
- 👤 Thomas G. Majewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:46
CPC Classifications
C; C08; C08B; C08B15/00; C08B15/005; Y; Y10; Y10S; Y10S507/00; Y10S507/903; Y10S507/922
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
51 words
A crosslinkable carboxymethyl hydroxyethyl cellulose composition containing essentially of (a) a carboxymethyl hydroxyethyl cellulose having a carboxymethyl degree of substitution from about 0.1 to 0.19 and a hydroxyethyl molar substitution of greater than about 1.0, and (b) an ionic agent containing an aluminum ion in the form of an aluminum salt.
Claim 2
Dependent Claim
51 words
A crosslinkable carboxymethyl hydroxyethyl cellulose composition containing essentially of (a) a carboxymethyl hydroxyethyl cellulose having a carboxymethyl degree of substitution from about 0.1 to 0.19 and a hydroxyethyl molar substitution of greater than about 1.0, and (b) an ionic agent containing an aluminum ion in the form of an aluminum salt.
Claim 3
Dependent Claim
21 words
The composition of claim 1 wherein the aluminum salt is selected from the group consisting of aluminum acetate and aluminum sulphate.
Claim 4
Dependent Claim
22 words
The composition of claim 1 wherein the carboxymethyl hydroxyethyl cellulose has a carboxymethyl degree of substitution of from about 0.15 to 0.19.
Claim 5
Dependent Claim
17 words
The composition of claim 1 wherein the hydroxyethyl molar substitution is from about 2.0 to about 2.5.
Claim 6
Dependent Claim
14 words
The composition of claim 1 wherein the hydroxyethyl molar substitution is less than 3.5.
Claim 7
Dependent Claim
12 words
The composition of claim 1 wherein the aluminum salt is aluminum acetate.
Claim 8
Dependent Claim
28 words
The composition of claim 6 wherein the aluminum acetate is present in an amount from about 1% to about 5%, by weight of the uncrosslinked carboxymethyl hydroxyethyl cellulose.
Claim 9
Dependent Claim
28 words
The composition of claim 6 wherein the aluminum acetate is present in an amount from about 2% to about 4%, by weight of the uncrosslinked carboxymethyl hydroxyethyl cellulose.
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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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |