US4400502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Readily dispersible anionic, water-soluble cellulose derivatives and a method for their preparation
Assignee: Aqualon Co
•
Filing: 1982-04-27
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Granted: 1983-08-23
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Expires: 2002-04-27
Abstract
Abstract Anionic, water-soluble cellulose ethers which are treated with a mixture of glyoxal and a sodium borate, preferably borax, readily disperse in aqueous solutions without clumping or agglomerating. These treated compounds can be formed by contacting an organic slurry of an anionic, water-soluble cellulose ether with an aqueous solution of glyoxal and a sodium borate, recovering the product and then drying it.
Inventors
- 👤 Thomas G. Majewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:10
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
46 words
A method for making a dispersible, anionic, water-soluble cellulose ether comprising: (a) contacting a particulate anionic water-soluble cellulose ether with an aqueous medium prepared from water, glyoxal, and a sodium borate to form a product; (b) recovering the resulting product; and (c) drying the recovered product.
Claim 2
Independent Claim
46 words
A method for making a dispersible, anionic, water-soluble cellulose ether comprising: (a) contacting a particulate anionic water-soluble cellulose ether with an aqueous medium prepared from water, glyoxal, and a sodium borate to form a product; (b) recovering the resulting product; and (c) drying the recovered product.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the aqueous sodium borate-glyoxal solution contains sufficient sodium borate to complex substantially all the glyoxal.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the sodium borate is borax.
Claim 5
Dependent Claim
21 words
The method of claim 3 wherein the borax to glyoxal ratio is from about 0.5:1 to about 5:1, based on weight.
Claim 6
Dependent Claim
21 words
The method of claim 3 wherein the borax to glyoxal ratio is from about 1:1 to about 2:1, based on weight.
Claim 7
Dependent Claim
28 words
The method of claim 1 wherein the aqueous sodium borate-glyoxal solution contains from about 0.1 to 1.0 wt% glyoxal based on the weight of anionic water-soluble cellulose ether.
Claim 8
Dependent Claim
29 words
The method of claim 1 wherein the aqueous sodium borate-glyoxal solution contains from about 0.2 to about 0.5 wt% glyoxal based on the weight of anionic water-soluble cellulose ether.
Claim 9
Dependent Claim
12 words
The method of claim 1 wherein the cellulose ether is carboxymethyl cellulose.
Claim 10
Dependent Claim
13 words
The method of claim 1 wherein the cellulose ether is carboxymethyl hydroxyethyl cellulose.
Claim 11
Dependent Claim
27 words
A particulate anionic water-soluble cellulose ether which has been treated with an aqueous medium prepared from water and the reaction product of glyoxal and a sodium borate.
Claim 12
Dependent Claim
27 words
A particulate anionic water-soluble cellulose ether which has been treated with an aqueous medium prepared from water and the reaction product of glyoxal and a sodium borate.
Claim 13
Dependent Claim
15 words
The particulate anionic water-soluble cellulose ether of claim 10 wherein the sodium borate is borax.
References Cited (Backward Citations)
US3072635A
Cited
US3297583A
Cited
US3356519A
Cited
US4309535A
Cited
US4298728A
Cited
US4306061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |