US4136218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the improvement of the water-absorbing capacity and the absorptivity of textile materials
Assignee: Hoechst AG
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Filing: 1975-08-27
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Granted: 1979-01-23
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Expires: 1995-08-27
Abstract
Abstract Process for improving the water-absorbing capacity and absorptivity of fibrous materials consisting of, or containing, synthetic fibers or filaments, which comprises applying modified, highly absorbing cellulose ethers onto the fibrous materials and fixing these cellulose ethers on the fibrous material with the aid of finishing agents, resins or binders.
Inventors
- 👤 Ehrenfried Nischwitz
- 👤 Arno Holst
- 👤 Ottokar Smerz
- 👤 Michael Kostrzewa
- 👤 Helmut Lask
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:18
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/01; D06M15/03; D06M15/05; D06M15/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
Process for improving the water-absorbing capacity and absorptivity of fibrous materials containing synthetic fibers or filaments, which comprises applying modified, highly absorbing cellulose ethers onto the fibrous materials and fixing said cellulose ethers thereon with the aid of carbamate-based, linear or cyclic urea-formaldehyde reactants or acrylic acid ester- or vinylacetate-based copolymers containing reactive groups, said cellulose ethers being carboxymethyl cellulose, carboxymethyl-hydroxyethyl cellulose, methylhydroxyethyl cellulose or hydroxyethyl cellulose which are modified with a compound of the formula ##STR3## CH.sub.2 ═CH--SO.sub.2 --NH.sub.2, in which in the first formula R 1 is hydroxyl, alkanoylamino or alkoxycarbonylamino, R 2 is hydrogen or carboxy and R 3 is hydrogen or methyl.
Claim 2
Dependent Claim
106 words
Process for improving the water-absorbing capacity and absorptivity of fibrous materials containing synthetic fibers or filaments, which comprises applying modified, highly absorbing cellulose ethers onto the fibrous materials and fixing said cellulose ethers thereon with the aid of carbamate-based, linear or cyclic urea-formaldehyde reactants or acrylic acid ester- or vinylacetate-based copolymers containing reactive groups, said cellulose ethers being carboxymethyl cellulose, carboxymethyl-hydroxyethyl cellulose, methylhydroxyethyl cellulose or hydroxyethyl cellulose which are modified with a compound of the formula ##STR3## CH.sub.2 ═CH--SO.sub.2 --NH.sub.2, in which in the first formula R 1 is hydroxyl, alkanoylamino or alkoxycarbonylamino, R 2 is hydrogen or carboxy and R 3 is hydrogen or methyl.
Claim 3
Dependent Claim
27 words
A process as claimed in claim 1 wherein the cellulose ether used is one which is water-soluble to at least 95% by weight prior to said modification.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 1 wherein the amount of modified cellulose ether is from 0.05 to 5% by weight of the fibrous material.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1 wherein the cellulose ether is modified with N-methylol-acrylamide.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 1 wherein the cellulose ether is hydroxyethyl cellulose or carboxymethyl cellulose modified with N-methylolacrylamide.
References Cited (Backward Citations)
US1954751A
Cited
US2046944A
Cited
US2131882A
Cited
US2259847A
Cited
US3870542A
Cited
US3965091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |