US4455347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic fibers having irregular-form section and process for producing the same
Assignee: Mitsubishi Chemical Corp
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Filing: 1982-04-05
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Granted: 1984-06-19
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Expires: 2002-04-05
Abstract
Abstract An acrylic fiber having an irregular form section and a ramie-like feeling, wherein the section of the fiber has unmethodical surface unevenness and has at least two concave parts which has a ratio of the length l of a perpendicular from a tangental line between adjacent convex parts of said unevenness to the deepest part of the concave part to the diameter D1 of a circumscribed circle: l/D1 of 0.05 or more, and the surface of said fiber is covered with many discontinuous creases having an average width of 1 mu or more provided along the lengthwise direction of the fiber, and process for producing the same.
Inventors
- 👤 Mitsutoshi Ochi
- 👤 Yoshinobu Kotera
- 👤 Masaki Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:58
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/253; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2973; Y10T428/2975; Y10T428/2978
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
An acrylic fiber having an irregular form section and a ramie-like feeling produced by throwing a spinning solution composed of an acrylonitrile copolymer and an organic solvent, the viscosity of which is 120 poises or less at 50° C., into a coagulating bath using a jet having a triangular orifice, and thereafter drawing, washing and drying said fiber, and, wherein the section of the fiber has unmethodical surface unevenness and has at least two concave parts which has a ratio of the length l of a perpendicular from a tangental line between adjacent convex parts of said unevenness to the deepest part of the concave part to the diameter D 1 of a circumscribed circle, wherein the ratio l/D 1 is 0.05 or more, and the surface of said fiber is covered with a plurality of discontinuous creases having an average width of 1μ or more and extending in the lengthwise direction of the fiber.
Claim 2
Dependent Claim
155 words
An acrylic fiber having an irregular form section and a ramie-like feeling produced by throwing a spinning solution composed of an acrylonitrile copolymer and an organic solvent, the viscosity of which is 120 poises or less at 50° C., into a coagulating bath using a jet having a triangular orifice, and thereafter drawing, washing and drying said fiber, and, wherein the section of the fiber has unmethodical surface unevenness and has at least two concave parts which has a ratio of the length l of a perpendicular from a tangental line between adjacent convex parts of said unevenness to the deepest part of the concave part to the diameter D 1 of a circumscribed circle, wherein the ratio l/D 1 is 0.05 or more, and the surface of said fiber is covered with a plurality of discontinuous creases having an average width of 1μ or more and extending in the lengthwise direction of the fiber.
Claim 3
Dependent Claim
31 words
The acrylic fiber of claim 1, which comprises a blend of 90 to 50% by weight of substantive acrylic fibers and 10 to 50% by weight of fibers containing capillary voids.
Claim 4
Dependent Claim
15 words
The acrylic fiber of claim 1, wherein the jet stretch ratio is 2.0 or less.
Claim 5
Dependent Claim
41 words
The acrylic fiber of claim 1, wherein the jet stretch ratio is 0.5 to 1.5, and the fiber comprises a blend of 90 to 50% by weight of substantive fiber and 10 to 50% by weight of fiber containing capillary voids.
Claim 6
Dependent Claim
24 words
The acrylic fiber of claim 3 or 4, wherein the drying temperature of the fiber is in a range of 105° to 160° C.
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) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |