Patent EP0199567A2 successfully refreshed from Google Patents.
EP0199567A2
Expired / Lapsed
EP
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Carbonaceous fibers with spring-like reversible deflection and method of manufacture
Assignee: Dow Chemical Co
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Filing: 1986-04-18
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Granted: —
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Expires: 2006-04-18
Abstract
Abstract e A unique partially carbonized or substantially completely carbonized, resilient, fiber, yarn or fiber tow having a spring-like structural configuration and a reversible deflection of greater than 1.2:1 is prepared from a carbonaceous precurser materials which is stabilized and then heat treated to a temperature sufficient to impart a spring-like structural configuration to the fiber. Such fibers, yarn or fiber tow is optionally knitted or woven into a cloth which can then be deknitted and carded, garnetted or otherwise defibrilated to produce a resilient web-like fluff or wool-like material having the spring-like structural configuration. Electrical conductivity and a fused benzoidal structural configuration to the surface of the fiber, can optionally be obtained by carbonization of the fibers at a temperature of up to 3000°C at any stage after the spring-like structural configuration is set in the fiber.
Inventors
- 👤 Francis Patrick Mccullough, Jr.
- 👤 David Michael Hall
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 18:33
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/22; D01F9/145; D01F9/15; D01F9/155; D01F9/24
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
42 words
An article derived from a stabilized, carbonaceous precursor material, said article comprising a partially carbonized or substantially completely carbonized fiber and being characterised in that the fiber has a spring-like structural configuration with a reversible deflection ratio of greater than about 1.2:1.
Claim 2
Dependent Claim
42 words
An article derived from a stabilized, carbonaceous precursor material, said article comprising a partially carbonized or substantially completely carbonized fiber and being characterised in that the fiber has a spring-like structural configuration with a reversible deflection ratio of greater than about 1.2:1.
Claim 3
Dependent Claim
19 words
An article as claimed in Claim 1, wherein the fiber has a diameter of from 4 to 20 micrometers.
Claim 4
Dependent Claim
16 words
An article as claimed in Claim 1, wherein said reversible deflection ratio is greater than 2:1.
Claim 5
Dependent Claim
25 words
An article as claimed in any one of the preceding claims, wherein said fiber has a specific electrical resistivity of less than 10 10 ohm-cm.
Claim 6
Dependent Claim
35 words
An article as claimed in any one of the preceding claims, wherein said fiber has a density of less than 2.5 gm/cm 3 , and/or a Young's modulus of from 7 GPa to 380 GPa.
Claim 7
Dependent Claim
26 words
An article as claimed in any one of the preceding claims, wherein said fiber has a surface area of from 0.5 to 1600 m 2 /gm.
Claim 8
Dependent Claim
21 words
An article as claimed in Claim 6, wherein said fiber has a surface area of less than 15 m 2 /gm.
Claim 9
Dependent Claim
50 words
A wool-like fluff comprising a multiplicity of fibers as claimed in any one of the preceding claims, said fibers having a specific resistivity of less than 10 10 ohm-cm and a resistance of less than 75 ohms at a probe distance of 60 cm when measured across the wool-like fluff.
Claim 10
Independent Claim
91 words
A method of forming a fiber with reversible deflection from a stabilized, carbonaceous precursor material, comprising the steps of imparting a spring-like shape to the stabilized fiber, heating the fiber having said spring-like shape in a relaxed state under non-oxidizing conditions and at a temperature sufficient to impart a temporary setting of a spring-like structural configuration to the fiber, and/or heating the fiber having said spring-like shape in a relaxed state under non-oxidizing conditions to a temperature sufficient to impart a permanent setting of a spring-like structural configuration to the fiber.
Claim 11
Independent Claim
91 words
A method of forming a fiber with reversible deflection from a stabilized, carbonaceous precursor material, comprising the steps of imparting a spring-like shape to the stabilized fiber, heating the fiber having said spring-like shape in a relaxed state under non-oxidizing conditions and at a temperature sufficient to impart a temporary setting of a spring-like structural configuration to the fiber, and/or heating the fiber having said spring-like shape in a relaxed state under non-oxidizing conditions to a temperature sufficient to impart a permanent setting of a spring-like structural configuration to the fiber.
Claim 12
Dependent Claim
34 words
A method as claimed in Claim 9, wherein said stabilized fiber is heated to a temperature of from 150°C to 550°C to impart said temporary setting of a spring-like structural configuration to the fiber.
Claim 13
Dependent Claim
47 words
A method as claimed in Claim 9 or Claim 10, wherein said stabilized fiber is heated to a temperature of from 550°C to 1550°C to impart said permanent setting of a spring-like structural configuration to the fiber and wherein said fiber, upon deflection, conforms to Hooke's law.
Claim 14
Independent Claim
65 words
A method as claimed in any one of Claims 9, 10 and 11, including the step of assembling the stabilized fiber into a fiber tow, imparting said spring-like structural configuration to the fiber tow, and heating the fiber tow in said relaxed condition to a temperature of from 550° to 1550°C to impart said permanent setting of a spring-like structural configuration to the fiber tow.
Claim 15
Dependent Claim
35 words
A method as claimed in Claim 11 or Claim 12, including the step of heating the permanently set fiber in a non-oxidizing atmosphere at a temperature up to 3000°C to render the fiber electrically conductive.
Claim 16
Independent Claim
105 words
A method as claimed in any one of Claims 11 to 13, including the step of imparting said spring-like structural configuration to a stabilized fiber tow by winding the tow around a cylindrical rod or mandrel, heating the wound fiber tow to a temperature of from 150°C. to 300°C in a non-oxidizing atmosphere, unwinding the fiber tow from the cylindrical rod or mandrel, and heating the fiber tow, in a relaxed condition, and in an inert atmosphere, to said temperature of from 550° to 1550°C to form a partially carbonized or substantia-lly completely carbonized fiber tow having a reversible deflection ratio of greater than 1.2:1.
Claim 17
Independent Claim
88 words
A method as claimed in any one of Claims 11 to 13, including the step of imparting said spring-like shape to a stabilized fiber tow by knitting the tow into a cloth, heating the cloth to a temperature of from 150°C to 550°C to impart said temporary set to the fibers in the cloth, deknitting the cloth, and heating the fiber tows from the deknitted cloth to a temperature of from 550°C to 1000°C to impart a permanent setting of a spring-like structural configuration to the fiber tows.
Claim 18
Dependent Claim
53 words
A method as claimed in Claim 10, including the step of imparting said spring-like shape to the stabilized fiber tow by knitting the tow into a cloth, heating the cloth to a temperature of from 150°C to 550°C, deknitting the cloth and mechanically treating the deknitted fiber tow to form a wool-like fluff.
Claim 19
Dependent Claim
31 words
A method as claimed in Claim 16, including the step of heating the wool-like fluff at a temperature of less than 1000°C to render the fibers in the fluff electrically conductive.
Claim 20
Dependent Claim
46 words
A method as claimed in Claim 16 or Claim 17, including the step of heating the electrically conductive fiber tow to a temperature of greater than 1000°C to render the fibers more highly electrically conductive, and incorporating the electrically conductive fibers into a synthetic resinous material.
Claim 21
Independent Claim
31 words
A method as claimed in any one of Claims 9 to 18, wherein the carbonaceous precurser material, on heating, forms fused benzenoid or equivalent skeletal orientation at or near the surface.
References Cited (Backward Citations)
No citation records indexed.
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