Patent US4356642A successfully refreshed from Google Patents.
EP0054437A2
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EP
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Carbonaceous pitch with dormant anisotropic components, process for preparation thereof, and use thereof to make carbon fibres
Assignee: Fuji Standard Research Inc
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Filing: 1981-12-15
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Granted: —
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Expires: 2001-12-15
Abstract
Abstract A novel carbonaceous pitch is provided which is optically isotropic in nature and which is converted into optically anisotropic when shear forces are applied thereto. The carbonaceous pitch may be obtained by hydrogenating the mesophase of a mesophase pitch to the extent that the mesophase is rendered soluble in quinoline. The novel carbonaceous pitch is useful as a binder, an impregnator or, especially, as a precursor material for the production of highly oriented, high-strength and high-modulus carbon fibers, needle coke or like carbonaceous materials.
Inventors
- 👤 Sugio Otani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 13:00
CPC Classifications
C; C10; C10C; C10C3/00; D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
52 words
A carbonaceous pitch comprising dormant anisotropic components which are substantially soluble in quinoline and which are partially hydrogenated materials derived from the mesophase of a mesophase pitch, said carbonaceous pitch being optically isotropic in nature but being capable of being oriented in one direction when subjected to shear forces in said direction.
Claim 2
Dependent Claim
52 words
A carbonaceous pitch comprising dormant anisotropic components which are substantially soluble in quinoline and which are partially hydrogenated materials derived from the mesophase of a mesophase pitch, said carbonaceous pitch being optically isotropic in nature but being capable of being oriented in one direction when subjected to shear forces in said direction.
Claim 3
Dependent Claim
18 words
A carbonaceous pitch as claimed in claim 1, and having a H/C atomic ratio of 0.55 to 1.2.
Claim 4
Dependent Claim
33 words
A carbonaceous pitch as claimed in claim 1 or claim 2., wherein said mesophase pitch from which said carbonaceous pitch is derived has a mesophase content of from 1 to 90 wt %.
Claim 5
Dependent Claim
22 words
A carbonaceous pitch as claimed in claim 3, wherein said mesophase pitch has a mesophase content of 5 to 70 wt %.
Claim 6
Dependent Claim
20 words
A carbonaceous pitch as claimed in any preceding claim and being a homogeneous liquid when heated above its melting point.
Claim 7
Dependent Claim
18 words
A carbonaceous pitch as claimed in any preceding claim, and having a melting point of 150 to 300°C.
Claim 8
Dependent Claim
23 words
A carbonaceous pitch as claimed in any preceding claim and exhibiting a viscosity of about 100 poises when heated to 200 to 300°C.
Claim 9
Dependent Claim
25 words
A process for the preparation of a carbonaceous pitch, comprising hydrogenating the mesophase of a mesophase pitch so that mesophase is rendered soluble in quinoline.
Claim 10
Dependent Claim
25 words
A process for the preparation of a carbonaceous pitch, comprising hydrogenating the mesophase of a mesophase pitch so that mesophase is rendered soluble in quinoline.
Claim 11
Dependent Claim
29 words
A process as claimed in claim 8, wherein said mesophase pitch is subjected to hydrogenating conditions so that substantially all the mesophase contained therein is rendered soluble in quinoline.
Claim 12
Dependent Claim
26 words
A process as claimed in claim 8 or claim 9, wherein said hydrogenation is conducted so that said mesophase pitch is rendered optically isotropic in nature.
Claim 13
Dependent Claim
33 words
A process as claimed in claim 10, wherein said hydrogenation is conducted so that the product of the hydrogenation, when subjected to shear forces in one direction, may be oriented in said direction.
Claim 14
Dependent Claim
23 words
A process as claimed in any one of claims 8-11, wherein said mesophase pitch has a H/C atomic ratio of 0.43 to 0.75.
Claim 15
Dependent Claim
20 words
A process as claimed in claim 12, wherein said mesophase pitch has a H/C atomic ratio of 0.45 to 0.65.
Claim 16
Dependent Claim
35 words
A process as claimed in any one of claims 8-13, wherein the product of said hydrogenation is heated above its melting point for a period of time sufficient to remove low boiling point components therefrom.
Claim 17
Dependent Claim
22 words
A process as claimed in claim 14, wherein the product of said hydrogenation is heated to a temperature of 450°C or less.
Claim 18
Dependent Claim
22 words
A process as claimed in claim 15, wherein the product of said hydrogenation is heated to a temperature of 280 to 430°C.
Claim 19
Dependent Claim
24 words
A process as claimed in any one of claims 8-16, wherein said mesophase pitch has a mesophase content of 1 to 90 wt %.
Claim 20
Dependent Claim
21 words
A process as claimed in claim 17, wherein said mesophase pitch has a mesophase content of 5 to 70 wt %.
Claim 21
Dependent Claim
69 words
A process for the production of a carbon fiber comprising the steps of: providing a carbonaceous pitch as claimed in any one of claims 1-7; heating said carbonaceous pitch above its melting point; spinning a carbonaceous fiber from said molten pitch; exposing said spi l n fiber in an oxygen-containing atmosphere so that said spun fiber is rendered infusible; and heat- treating said infusible fiber at temperatures above 800°C.
References Cited (Backward Citations)
No citation records indexed.
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