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US 4,146,576 AGranted
Manufacture of carbon fibres
AssigneeCoal Industry (Patents) Limited
InventorWalter F. Wyss
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AssigneeCoal Industry (Patents) Limited
InventorWalter F. Wyss
Estimating the term…
The invention relates to an improvement in a process for the production of carbon fibres (also filaments and films) from organic material consisting mainly of hydrocarbons (e.g., pitch, tars, solutions or extracts of coal). The organic material is spun or extruded to form a fibre, oxidized to stabilize it to heat treatment and subsequently carbonized. The invention comprises employing in place of, or as, the organic material consisting mainly of hydrocarbons a modified organic material formed by reacting an aromatic hydrocarbon material having at least two fused rings (which may be such an organic material consisting mainly of hydrocarbons) with a cross-linking agent, the cross-linking agent having at least two groups selected from groups that react with and substitute onto aromatic hydrocarbon rings. Suitable groups include acyl chloride, alkyl chloride, carboxylic acid anhydride, olefin, and alcoholic hydroxyl groups.
A process for the production of fibres, filaments and films consisting essentially of carbon comprising mixing a solution or extract of coal with 1% by weight of benzenedisulphonylchloride, heating said mixture to 300.degree. C. in an oxygen-free atmosphere for a period of four hours, cooling said mixture, extruding said mixture at a temperature of 250.degree. C., heating said extruded product in oxygen to 270.degree. C. at a rate of 10.degree. C./minute and heating the resultant product in nitrogen at a rate of 850.degree. C./hr to 1000.degree. C.
Dependencies are inferred from the claim text.