US5290626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microfibers-generating fibers and a woven or non-woven fabric of microfibers
Assignee: RESEARCH Corp TECHNOLOGIES Inc A NOT-FOR-PROFIT NON-STOCK CORP OF DE
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Filing: 1992-02-07
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Granted: 1994-03-01
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Expires: 2012-02-07
Abstract
Abstract A web or a fibers consisting of microfibers having a fineness of 0.01 denier or less is provided, which web or fibers is obtained by spinning conjugate fibers consisting of microfibers-generating fibers of island-in-sea type, according to melt blown process, the sea component being a thermoplastic resin (polyvinyl alcohol) capable of being removed with a solvent (water) and the island component being a thermoplastic resin (polypropylene) insoluble in the solvent used for the sea component, followed by collecting the spun conjugate fibers in the form of a web or a tow; the resulting composite fibers being thinner than those obtained according to conventional conjugate spinning and the microfibers obtained by removing the sea component also being thinner than fibers obtained from conventional conjugate fibers of island-in-sea type.
Inventors
- 👤 Hiroaki Nishioi
- 👤 Satoshi Ogata
- 👤 Yoshimi Tsujiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:12
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/14; D04H3/147; B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/36; D01F; D01F8/00; D01F8/04; D01F8/06; D01F8/10; D04H1/00; D04H1/40; D04H1/54; D04H1/56; D04H3/16; B01D2239/00; B01D2239/06; B01D2239/0604; B01D2239/0618; B01D2239/0622; B01D2239/12; B01D2239/1233; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T442/00; Y10T442/30; Y10T442/3146; Y10T442/3163; Y10T442/60; Y10T442/637; Y10T442/64
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
Microfibers-generating fibers consisting essentially of island-in-sea type conjugate fibers spun according to a melt blown process, the sea part of said conjugate fibers being composed of a thermoplastic polymer capable of being removed with a solvent and the island part thereof being composed of a thermoplastic polymer insoluble in said solvent and forming microfibers having a fineness of a single fiber of 0.01 denier or less.
Claim 2
Dependent Claim
66 words
Microfibers-generating fibers consisting essentially of island-in-sea type conjugate fibers spun according to a melt blown process, the sea part of said conjugate fibers being composed of a thermoplastic polymer capable of being removed with a solvent and the island part thereof being composed of a thermoplastic polymer insoluble in said solvent and forming microfibers having a fineness of a single fiber of 0.01 denier or less.
Claim 3
Dependent Claim
36 words
Microfibers-generating fibers according to claim 1, wherein said solvent is water, said thermoplastic polymer capable of being removed with said solvent is a polyvinyl alcohol and said thermoplastic polymer insoluble in said solvent is a polypropylene.
Claim 4
Dependent Claim
17 words
Microfibers obtained by removing the sea part of said microfibers-generating fibers as set forth in claim 1.
Claim 5
Dependent Claim
47 words
A woven or non-woven fabric having microfibers obtained by removing, from a woven or non-woven fabric prepared by using microfibers-generating fibers as set forth in claim 1, the sea part contained in said fibers at the time of or after preparation of said woven or non-woven fabric.
Claim 6
Dependent Claim
39 words
A woven or non-woven fabric according to claim 4, wherein said solvent is water, said thermoplastic polymer capable of being removed with said solvent is a polyvinyl alcohol and said thermoplastic polymer insoluble in said solvent is a polypropylene.
Claim 7
Dependent Claim
37 words
A woven or non-woven fabric having microfibers obtained by removing the sea part in microfibers-generating fibers as set forth in claim 1 to obtain microfibers, and preparing a woven or non-woven fabric by using the resulting microfibers.
Claim 8
Dependent Claim
39 words
A woven or non-woven fabric according to claim 6, wherein said solvent is water, said thermoplastic polymer capable of being removed with said solvent is a polyvinyl alcohol, and said thermoplastic polymer insoluble in said solvent is a polypropylene.
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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) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |