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US4458068A
Expired / Lapsed
US
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Water-soluble, ternary cellulose ethers
Assignee: Dow Chemical Co
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Filing: 1983-03-25
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Granted: 1984-07-03
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Expires: 2003-03-25
Abstract
Abstract Novel ternary hydroxyethylhydroxypropylmethylcellulose ethers are disclosed. These ethers have lower cloud points than most cellulose ethers having hydroxyethoxyl substitution and exhibit return cloud points which are approximately the same as their cloud points.
Inventors
- 👤 Patricia A. Warner
- 👤 George K. Greminger
- 👤 Clark W. Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:01
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/193
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
A ternary hydroxyethylhydroxypropylmethylcellulose ether having a methoxyl degree of substitution of about 0.9 to about 2.1, a hydroxyethoxyl molar substitution of about 0.2 to about 0.5, and a hydroxypropoxyl molar substitution of about 0.08 to about 0.4.
Claim 2
Dependent Claim
37 words
A ternary hydroxyethylhydroxypropylmethylcellulose ether having a methoxyl degree of substitution of about 0.9 to about 2.1, a hydroxyethoxyl molar substitution of about 0.2 to about 0.5, and a hydroxypropoxyl molar substitution of about 0.08 to about 0.4.
Claim 3
Dependent Claim
32 words
The ternary cellulose ether of claim 1 wherein the methoxyl degree of substitution is from about 1.25 to about 2 and the hydroxypropoxyl molar substitution is from about 0.1 to about 0.3.
Claim 4
Dependent Claim
17 words
The ternary cellulose ether of claim 1 which has a cloud point of 70° C. or less.
Claim 5
Dependent Claim
25 words
The ternary cellulose ether of claim 1 having a return cloud point which is no more than 10° C. lower than the cloud point thereof.
Claim 6
Dependent Claim
25 words
The ternary cellulose ether of claim 4 having a return cloud point which is no more than 5° C. lower than the cloud point thereof.
Claim 7
Dependent Claim
27 words
The ternary cellulose ether of claim 5 having a viscosity at 20° C. as a 2 weight percent solution in the range from 10 to 100,000 cps.
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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |