EP0381206A2
Expired / Lapsed
EP
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Fiber, rovings and mats from lyotropic liquid crystalline polymers
Assignee: EIDP Inc
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Filing: 1990-02-01
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Granted: —
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Expires: 2010-02-01
Abstract
Abstract Novel process for preparing subdenier fiber and structures thereof from lyotropic liquid crystalline polymers.
Inventors
- 👤 Steven Robert Allen
- 👤 Aziz Ahmed Mian
- 👤 Sam Louis Samuels
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 05:24
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01F6/605; D01D; D01D5/00; D01D5/08; D01D5/098; D01D5/0985; D01D5/11; D01F2/00; D01F2/24; D01F2/28; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
A process for preparing subdenier fiber from lyotropic liquid crystalline polymers comprising 1) extruding a stream of an optically anisotropic solution of a polymer through a spinneret orifice into a chamber, 2) introducing a pressurized gas into said chamber, 3) directing the gas in the flow direction of and in surrounding contact with said stream within the chamber, 4) passing both the gas and stream through an aperture into a zone of lower pressure at a velocity sufficient to attenuate the stream and fragment it into fibers, and 5) contacting the fragmented stream in said zone with a coagulating fluid.
Claim 2
Dependent Claim
100 words
A process for preparing subdenier fiber from lyotropic liquid crystalline polymers comprising 1) extruding a stream of an optically anisotropic solution of a polymer through a spinneret orifice into a chamber, 2) introducing a pressurized gas into said chamber, 3) directing the gas in the flow direction of and in surrounding contact with said stream within the chamber, 4) passing both the gas and stream through an aperture into a zone of lower pressure at a velocity sufficient to attenuate the stream and fragment it into fibers, and 5) contacting the fragmented stream in said zone with a coagulating fluid.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein the optically anisotropic polymer solution is a solution of poly(p-phenyleneterephthalamide) in concentrated sulfuric acid.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein the polymer in solution is cellulose triacetate.
Claim 5
Dependent Claim
14 words
A process according to claim 1 wherein the polymer in solution is chitosan acetate.
Claim 6
Dependent Claim
19 words
A process according to claim 1 wherein the polymer in solution is a mixture of poly(p-phenyleneterephthalamide) and nylon 6/6.
Claim 7
Dependent Claim
32 words
A process according to claim 1 wherein the polymer in solution is a mixture of poly(p-phenyleneterephthalamide) and an amorphous polyamide from a mixture of terephthalic and isophthalic acids, bis(p-aminocyclohexyl)methane and hexamethylene diamine.
Claim 8
Dependent Claim
27 words
A process according to claim 1 wherein the polymer in solution is a mixture of poly(p-phenylene terephthalamide) and a copolymer prepared from 3,4′-diaminodiphenyl ether and isophthaloyl bis(caprolactam).
Claim 9
Dependent Claim
17 words
A process according to claim 1 wherein the zone of lower pressure is air at atmospheric pressure.
Claim 10
Dependent Claim
19 words
A process according to claim 1 wherein the gas in contact with the extrudate in the chamber is air.
Claim 11
Dependent Claim
21 words
A process according to claim 1 wherein the subdenier fiber is collected in the form of fibers, rovings or nonwoven mats.
Claim 12
Dependent Claim
12 words
A process according to claim 2 wherein the coagulating fluid is water.
Claim 13
Dependent Claim
11 words
A product produced by the process of claim 1 or 10.
References Cited (Backward Citations)
No citation records indexed.
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