Patent EP0181998A2 successfully refreshed from Google Patents.
EP0181998A2
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EP
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Acrylic fiber having excellent durability and dyeability and process for preparation thereof
Assignee: OFFERTA DI LICENZA AL PUBBLICO;AL PUBBLICO
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Filing: 1985-04-26
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Granted: —
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Expires: 2005-04-26
Abstract
Abstract Disclosed in an acrylic fiber composed of an acrylonitrile homopolymer or copolymer whose surface consists of particulate and/or microfibrillar structures having a width of 0.01 to 0.5 µm and a length of 0.05 to 10 µm and fibrillar structures formed by aggregation of the particulate and/or microfibrillar structures and having a width of 0.1 to 10 µm and a length of at least 50 um. The fiber is prepared by spinning a dope of an acrylonitrile homopolymer or copolymer in a solvent at a draft ratio of at least 5 into a coagulating bath comprising a solvent and a coagulant and having a composition such that a skin layer is not formed on the coagulated fiber: taking up the coagulated fiber from the coagulating bath so that the retention time in the coagulating bath is within 60 seconds; and then drawing the fiber in a drawing bath comprising a solvent and a coagulant and having a coagulating property to the dope and a composition such that a skin layer is not formed on the fiber.
Inventors
- 👤 Kenji Kamide
- 👤 Yutaka Honda
- 👤 Shuji Kajita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 07:33
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2978; Y10T428/298
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
68 words
An acrylic fiber composed of an acrylonitrile homopolymer or acrylonitrile copolymer, the surface of said acrylic fiber consisting of particulate and/or microfibrillar structures having a width of 0.01 to 0.5 µm and a length of 0.05 to 10 µm and fibrillar structures formed by aggregation of said particulate and/or microfibrillar structures and having a width of 0.1 to 10 µm and a length of at least 50 µm.
Claim 2
Dependent Claim
68 words
An acrylic fiber composed of an acrylonitrile homopolymer or acrylonitrile copolymer, the surface of said acrylic fiber consisting of particulate and/or microfibrillar structures having a width of 0.01 to 0.5 µm and a length of 0.05 to 10 µm and fibrillar structures formed by aggregation of said particulate and/or microfibrillar structures and having a width of 0.1 to 10 µm and a length of at least 50 µm.
Claim 3
Dependent Claim
40 words
An acrylic fiber according to claim 1 wherein said particulate and/or microfibrillar structures have a width of 0.05 to 0.3 µm and a length of 0.5 to 10 µm, whose long axes extend in the direction of the fiber axis.
Claim 4
Dependent Claim
32 words
An acrylic fiber according to claim 1 or 2 wherein said fibrillar structures extend substantially in parallel to the direction of the fiber axis over a length of at least 100 µm.
Claim 5
Dependent Claim
124 words
A process for preparing an acrylic fiber according to a wet spinning method using a dope of an acrylonitrile homopolymer or acrylonitrile copolymer in a solvent, which comprises spinning said dope at a draft ratio of at least 5 into a coagulating bath comprising a solvent and a coagulant and having a composition such that a skin layer is not formed on the coagulated fiber, taking up the coagulated fiber from the coagulating bath so that the retention time in the coagulating bath is within 60 seconds, and then drawing the fiber in a drawing bath comprising a solvent and a coagulant and having a coagulating property to said dope and a composition such that a skin layer is not formed on the fiber.
Claim 6
Dependent Claim
124 words
A process for preparing an acrylic fiber according to a wet spinning method using a dope of an acrylonitrile homopolymer or acrylonitrile copolymer in a solvent, which comprises spinning said dope at a draft ratio of at least 5 into a coagulating bath comprising a solvent and a coagulant and having a composition such that a skin layer is not formed on the coagulated fiber, taking up the coagulated fiber from the coagulating bath so that the retention time in the coagulating bath is within 60 seconds, and then drawing the fiber in a drawing bath comprising a solvent and a coagulant and having a coagulating property to said dope and a composition such that a skin layer is not formed on the fiber.
Claim 7
Dependent Claim
89 words
A process according to claim 4 wherein said solvents for the coagulating bath and the drawing bath are selected from the group consisting of concentrated aqueous solutions of inorganic salts, concentrated aqueous solutions of inorganic acids, amide compounds, nitrile compounds, sulfone and sulfoxide compounds, thiocyanate compounds, nitro compounds, amino compounds, phosphorus compound, and carbonate compounds; and said coagulants for the coagulating bath and the drawing bath are selected from the group consisting of water, methanol, ethanol, acetone, acetic acid, ethylene glycol, carbon tetrachloride, xylene and benzene and mixtures thereof.
Claim 8
Dependent Claim
36 words
A process according to claim 4 wherein said coagulants for the coagulating bath and the drawing bath are water, and said solvents for the coagulating bath and the drawing bath are the same as each other.
Claim 9
Dependent Claim
73 words
A process according to claim 4 wherein the coagulating bath and the drawing bath are comprised of an aqueous solution selected from the group consisting of an aqueous nitric acid solution having a concentration of 38% to 50% by weight, an aqueous dimethylformamide, dimethylacetamide or dimethylsulfoxide solution having a concentration of 65 to 90% by weight, and an aqueous rhodanate or zinc chloride solution having concentration of a 20% to 40% by weight.
Claim 10
Dependent Claim
23 words
A process according to any of claims 4 through 7 wherein the draft ratio is in the range of from 5 to 100.
Claim 11
Dependent Claim
31 words
A process according to any of claims 4 through 7 wherein the retention time of the fiber in the coagulating bath is in the range of from 0.5 to 30 seconds.
Claim 12
Dependent Claim
44 words
A process according to any of claims 4 through 7 wherein the draft ratio is in the range of from 5 to 100 and the retention time of the fiber in the coagulating bath is in the range of from 0.5 to 30 seconds.
Claim 13
Dependent Claim
23 words
A process according to any of claims 4 through 7 wherein the fiber is drawn at a draw ratio of 2 to 20.
Claim 14
Dependent Claim
36 words
A process according to any of claims 4 through 7 wherein the draft ratio is in the range of from 5 to 100, and the fiber is drawn at a draw ratio of 2 to 20.
Claim 15
Dependent Claim
44 words
A process according to any of claims 4 through 7 wherein the retention time ot the fiber in the coagulating bath is in the range of from 0.5 to 30 seconds, and the fiber is drawn at a draw ratio of 2 to 20.
Claim 16
Dependent Claim
56 words
A process according to any of claims 4 through 7 wherein the draft ratio is in the range of from 5 to 100, the retention time of the fiber in the coagulating bath is in the range of from 0.5 to 30 seconds, and the fiber is drawn at a draw ratio of 2 to 20.
References Cited (Backward Citations)
No citation records indexed.
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