Carbon fiber sheet and process for production thereof
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United States of America Patent
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Nov 2, 2004
Grant Date -
Feb 6, 2003
app pub date -
Jul 24, 2002
filing date -
Nov 24, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for producing a carbon fiber sheet, which comprises allowing, as necessary, an oxidized polyacrylonitrile fiber sheet to contain 0.2 to 5% by mass of a resin, then subjecting the resin-containing oxidized polyacrylonitrile fiber sheet to a compression treatment in the thickness direction under the conditions of 150 to 300.degree. C. and 5 to 100 MPa (10 to 100 MPa when no resin treatment is made) to obtain a compressed, oxidized fiber sheet having a bulk density of 0.40 to 0.80 g/cm.sup.3 and a compression ratio of 40 to 75%, and thereafter subjecting the compressed, oxidized fiber sheet to a carbonizing treatment, which carbon fiber sheet has a thickness of 0.15 to 1.0 mm, a bulk density of 0.15 to 0.45 g/cm.sup.3, a carbon fiber content of 95% by mass or more, a compression deformation ratio of 10 to 35%, an electric resistance of 6 m.OMEGA. or less and a feeling of 5 to 70 g.
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