Patent US5011644A successfully refreshed from Google Patents.
US5011644A
Expired / Lapsed
US
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Process for producing gel fiber
Assignee: Canon Inc
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Filing: 1989-04-24
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Granted: 1991-04-30
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Expires: 2009-04-24
Abstract
Abstract A process for producing a gel fiber comprises a step (N) of spinning a solution containing at least one polymer having at least one monomer unit as a constituent component for a gel to solidify the solution into a fiber, and step (M) of effecting crosslinking of the fiber to form a gel which can be swelled or shrunk reversibly by a thermal action in the presence of a liquid.
Inventors
- 👤 Masahiro Haruta
- 👤 Hirohide Munakata
- 👤 Satoshi Yuasa
- 👤 Yoko Yoshinaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:37
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/38; D01F; D01F11/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A process for producing a gel fiber, comprising a step (N) of spinning a solution containing as a constituent component for a gel at least one polymer having at least one monomer unit selected from the group consisting of N-n-propylacrylamide, N-n-propylmethacrylamide, N-iso-propylacrylamide, N-isopropylmethacrylamide, N-cyclopropylacrylamide, N-cyclopropylmethacrylamide, N,N-ethylmethylacrylamide, N,N-diethylacrylamide, N-acrylpyrrolidine, N-acrylpiperidine, to solidify the solution into a fiber, and the step (M) of effecting crosslinking of the fiber to form a gel which can be swelled or shrunk reversibly by a thermal action in the presence of a liquid.
Claim 2
Dependent Claim
87 words
A process for producing a gel fiber, comprising a step (N) of spinning a solution containing as a constituent component for a gel at least one polymer having at least one monomer unit selected from the group consisting of N-n-propylacrylamide, N-n-propylmethacrylamide, N-iso-propylacrylamide, N-isopropylmethacrylamide, N-cyclopropylacrylamide, N-cyclopropylmethacrylamide, N,N-ethylmethylacrylamide, N,N-diethylacrylamide, N-acrylpyrrolidine, N-acrylpiperidine, to solidify the solution into a fiber, and the step (M) of effecting crosslinking of the fiber to form a gel which can be swelled or shrunk reversibly by a thermal action in the presence of a liquid.
Claim 3
Dependent Claim
32 words
A process according to claim 1, wherein said solution contains at least one solvent selected from the group consisting of water, alcohols, ketones, hydrocarbons, halogenated hydrocarbons, esters, ethers, amides, and sulfur-containing solvents.
Claim 4
Dependent Claim
17 words
A process according to claim 1, wherein the wet spinning method is applied in said step (N).
Claim 5
Dependent Claim
17 words
A process according to claim 1, wherein the dry spinning method is applied in said step (N).
Claim 6
Dependent Claim
18 words
A process according to claim 4, wherein the solution contains 5 to 30% by weight of a polymer.
Claim 7
Dependent Claim
18 words
A process according to claim 3, wherein the solution contains 1 to 15% by weight of a polymer.
Claim 8
Dependent Claim
13 words
A process according to claim 1, wherein said solution contains a crosslinkable polymer.
Claim 9
Dependent Claim
16 words
A process according to claim 1, wherein said solution contains a polymer and a crosslinking agent.
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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) | 1994-04-29 | 1994-10-29 | 1995-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-29 | 1998-10-29 | 1999-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-29 | 2002-10-29 | 2003-04-30 | $7700.00 | Window Closed / Lapsed |