US4283229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation and use of stable cellulose ether suspensions
Assignee: Hoechst AG
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Filing: 1979-02-09
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Granted: 1981-08-11
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Expires: 1999-02-09
Abstract
Abstract This invention relates to an improvement in the process for the preparation of a stable aqueous electrolyte-containing cellulose ether suspension, wherein an inherently water-soluble cellulose ether is added, in the form of solid particles, to an aqueous solution of an electrolyte and uniformly distributed therein, the improvement comprising using a non-ionogenic cellulose ether and adding alumina to the suspension.
Inventors
- 👤 Friedrich Girg
- 👤 Volker Knittel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:02
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C08; C08L; C08L1/00; C08L1/08; C08L1/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
In the process for the preparation of a stable aqueous electrolyte-containing cellulose ether suspension, wherein an inherently water-soluble cellulose ether is added, in the form of solid particles, to an aqueous solution of an electrolyte and uniformly distributed therein, the improvement comprising using a non-ionogenic cellulose ether and adding alumina to the suspension, and wherein the amounts of the components of said suspension are about 0.5 to 40 percent by weight of said non-ionogenic cellulose ether, about 4 to 12 percent by weight of electrolyte and about 0.1 to 10 percent by weight of alumina, calculated on the weight of the electrolyte solution.
Claim 2
Dependent Claim
103 words
In the process for the preparation of a stable aqueous electrolyte-containing cellulose ether suspension, wherein an inherently water-soluble cellulose ether is added, in the form of solid particles, to an aqueous solution of an electrolyte and uniformly distributed therein, the improvement comprising using a non-ionogenic cellulose ether and adding alumina to the suspension, and wherein the amounts of the components of said suspension are about 0.5 to 40 percent by weight of said non-ionogenic cellulose ether, about 4 to 12 percent by weight of electrolyte and about 0.1 to 10 percent by weight of alumina, calculated on the weight of the electrolyte solution.
Claim 3
Dependent Claim
69 words
A process according to claim 1 including adding, in an amount of about 0.05 to 20 percent by weight calculated on the weight of the electrolyte solution, and in addition to alumina, an organic substance selected from the group consisting of glycols, long-chain monohydric alcohols, hydroxyethylated alcohols, hydroxyethylated amines, hydroxyethylated fatty acids, propylene oxide/ethylene oxide adducts, and long-chain fatty acids, which stabilizes the suspension and reduces the viscosity thereof.
Claim 4
Dependent Claim
25 words
A process according to claim 1 in which a methyl cellulose, an alkyl hydroxyalkyl cellulose, or a hydroxyalkyl cellulose is used as the cellulose ether.
Claim 5
Dependent Claim
24 words
A process according to claim 1 in which alkali carbonates, alkali sulfates, alkaline earth sulfates, or earth metal sulfates are used as the electrolyte.
Claim 6
Dependent Claim
15 words
A process according to claim 1 in which the electrolyte used is an alkali carbonate.
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) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |