Patent US4603083A successfully refreshed from Google Patents.
US4603083A
Expired / Lapsed
US
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Ultra-high-tenacity polyvinyl alcohol fiber and process for producing same
Assignee: Toray Industries Inc
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Filing: 1984-12-12
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Granted: 1986-07-29
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Expires: 2004-12-12
Abstract
Abstract An ultra-high-tenacity multifilament fiber of polyvinyl alcohol having a degree of polymerization of at least 1500, said filament having a tensile strength of at least 12 g/d and an initial modulus greater than 280 g/d, which is produced by a process for producing an ultra-high-tenacity polyvinyl alcohol fiber which comprises the steps of dissolving polyvinyl alcohol having a degree of polymerization of at least 1500 in a solvent, dry-spinning the resulting polymer solution through a spinneret into an environment of air or inert gas, introducing the dry-spun filaments into a coagulating bath, and drawing the coagulated filaments at a total effective draw ratio of at least 20 times.
Inventors
- 👤 Hiroyoshi Tanaka
- 👤 Mitsuo Suzuki
- 👤 Fujio Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:25
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
45 words
An ultra-high tenacity filament of polyvinyl alcohol having a degree of polymerization of at least 1500, a fineness lower than 10 deniers, a residual elongation lower than 5%, a tensile strength of at least 12 g/d and an initial modulus of at least 280 g/d.
Claim 2
Dependent Claim
45 words
An ultra-high tenacity filament of polyvinyl alcohol having a degree of polymerization of at least 1500, a fineness lower than 10 deniers, a residual elongation lower than 5%, a tensile strength of at least 12 g/d and an initial modulus of at least 280 g/d.
Claim 3
Dependent Claim
19 words
An ultra-high-tenacity polyvinyl alcohol filament as claimed in claim 1, which is produced by the dry-jet wet spinning process.
Claim 4
Dependent Claim
28 words
An ultra-high-tenacity polyvinyl alcohol filament as claimed in claim 1, which has a tensile strength of at least 15 and an initial modulus of at least 300 g/d.
Claim 5
Dependent Claim
44 words
An ultra-high-tenacity polyvinyl alcohol filament as claimed in claim 1, which is produced from polyvinyl alcohol having a degree of polymerization of at least 2500 and has a tensile strength of at least 17.5 g/d and an initial modulus of at least 350 g/d.
Claim 6
Dependent Claim
28 words
An ultra-high-tenacity polyvinyl alcohol filament as claimed in claim 1, which has birefringence of at least 50×10 -3 and has no long-period patterns arising from small-angle X-ray scattering.
Claim 7
Dependent Claim
17 words
An ultra-high-tenacity polyvinyl alcohol filament as claimed in claim 1, having a fineness lower than 5 deniers.
Claim 8
Dependent Claim
23 words
An ultra-high-tenacity polyvinyl alcohol filament as claimed in claim 1, having a fineness lower than 3 deniers and a round or oval cross-section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |