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US4546158A
Expired / Lapsed
US
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Vinylidene fluoride resin fiber and process for producing the same
Assignee: Kureha Corp
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Filing: 1984-07-23
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Granted: 1985-10-08
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Expires: 2004-07-23
Abstract
Abstract A vinylidene fluoride resin fiber having an increased tensile strength is obtained by spinning by melt-extrusion of a vinylidene fluoride resin having a large polymerization degree under the conditions of a small extrusion rate and a large draft ratio into a small diameter of spun fiber. The thus obtained fiber is characterized by having no crystal melting point based on the vinylidene fluoride chains at a temperature below 178° C., and having a mean crystal length in the molecular chain direction of 200 A or longer and a birefringence of 30×10 -3 or larger.
Inventors
- 👤 Toshiya Mizuno
- 👤 Naohiro Murayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:20
CPC Classifications
G; G10; G10D; G10D3/00; G10D3/10; D; D01; D01F; D01F6/00; D01F6/02; D01F6/08; D01F6/12; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A vinylidene fluoride resin fiber, comprising a vinylidene fluoride resin having a number average polymerization degree of 600 or more, having no crystal melting point based on the vinylidene fluoride chains at a temperature below 178° C., and having a mean crystal length in the molecular chain direction of 200 Å or longer and a birefrigence of 30×10 -3 or larger.
Claim 2
Dependent Claim
61 words
A vinylidene fluoride resin fiber, comprising a vinylidene fluoride resin having a number average polymerization degree of 600 or more, having no crystal melting point based on the vinylidene fluoride chains at a temperature below 178° C., and having a mean crystal length in the molecular chain direction of 200 Å or longer and a birefrigence of 30×10 -3 or larger.
Claim 3
Dependent Claim
27 words
A vinylidene fluoride resin fiber according to claim 1, wherein said vinylidene fluoride resin has a ratio of weight-average molecular weight/number-average molecular weight of 10 or less.
Claim 4
Dependent Claim
19 words
A vinylidene fluoride resin fiber according to claim 1, wherein said vinylidene fluoride resin comprises homopolymer of vinylidene fluoride.
Claim 5
Dependent Claim
35 words
A vinylidene fluoride resin fiber according to claim 1, wherein said vinylidene fluoride resin comprises a copolymer of 70% or more of vinylidene fluoride and the remainder of a monomer copolymerizable with the vinylidene fluoride.
Claim 6
Dependent Claim
18 words
A vinylidene fluoride resin fiber according to claim 1, which has a diameter of 25 microns or smaller.
Claim 7
Dependent Claim
20 words
A vinylidene fluoride resin fiber according to claim 1, which has a tensile strength of 120 Kg/mm 2 or above.
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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |