US4200558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing hydrophilic articles of water-insoluble polymers
Assignee: Hoechst AG
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Filing: 1978-05-08
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Granted: 1980-04-29
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Expires: 1998-05-08
Abstract
Abstract Hydrophilic films, fibers and spongy articles of a water-insoluble polymer selected from the group consisting of regenerated cellulose, cellulose ether, cellulose ester and polyalkylene, and capable of forming fibers and films, are produced by distributing in a mass of the polymer up to 50% of pulverulent or granular amorphous particles of an originally water-soluble cellulose ether prepared from natural cellulose and rendered by chemical modification at least partly water-insoluble while remaining water-absorbent. The resulting mixture is then processed by conventional methods into the desired article.
Inventors
- 👤 Arno Holst
- 👤 Michael Kostrzewa
- 👤 Helmut Lask
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:41
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/10; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; B01D69/00; B01D69/14; B01D69/141; B01J; B01J47/00; B01J47/12; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2212; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/056; C08J9/00; C08J9/28; C08L; C08L1/00; C08L1/08; D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/24; D01F2/28; D06; D06M; D06M15/00; D06M15/01; D06M15/03; D06M15/05; D06M15/09; C08J2301/00; C08J2301/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
96 words
A process for the production of a hydrophilic film, fiber or spongy product of a water-insoluble polymer selected from the group consisting of regenerated cellulose, cellulose ether, cellulose ester, and polyalkylene, and capable of forming fibers and films, which comprises uniformly distributing in a mass of said polymer, up to 50% by weight of the total weight of said product of pulverulent or granular amorphous particles of an originally water-soluble cellulose ether prepared from natural cellulose and rendered by chemical cross-linking more than 50% by weight water-insoluble while remaining water absorbent, and shaping the resulting mixture.
Claim 2
Dependent Claim
96 words
A process for the production of a hydrophilic film, fiber or spongy product of a water-insoluble polymer selected from the group consisting of regenerated cellulose, cellulose ether, cellulose ester, and polyalkylene, and capable of forming fibers and films, which comprises uniformly distributing in a mass of said polymer, up to 50% by weight of the total weight of said product of pulverulent or granular amorphous particles of an originally water-soluble cellulose ether prepared from natural cellulose and rendered by chemical cross-linking more than 50% by weight water-insoluble while remaining water absorbent, and shaping the resulting mixture.
Claim 3
Dependent Claim
35 words
A process according to claim 1 in which the cellulose ether is cross-linked with a cross-linking agent selected from the group consisting of dimethylolmethylene-bis-acrylamide, methylene-bis-acrylamide, trichloro-pyrimidine, tetrachloro-pyrimidine, cyanuric chloride, epichlorohydrin, dichloroacetic acid, diepoxides and di-α-halogenohydrins.
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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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |