| (19) |
 |
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(11) |
EP 0 329 128 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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13.03.1991 Bulletin 1991/11 |
| (43) |
Date of publication A2: |
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23.08.1989 Bulletin 1989/34 |
| (22) |
Date of filing: 16.02.1989 |
|
| (51) |
International Patent Classification (IPC)4: D01F 9/22 |
|
| (84) |
Designated Contracting States: |
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AT BE CH DE ES FR GB IT LI LU SE |
| (30) |
Priority: |
16.02.1988 US 156389
|
| (71) |
Applicant: HERCULES INCORPORATED |
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Wilmington
Delaware 19894 (US) |
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| (72) |
Inventor: |
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- Paul, James Toner, Jr.
Wilmington
Delaware 19808 (US)
|
| (74) |
Representative: Lederer, Franz, Dr. et al |
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Lederer, Keller & Riederer
Patentanwälte
Prinzregentenstrasse 16
80538 München
80538 München (DE) |
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| |
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| (54) |
Novel method of manufacturing carbon fiber using preliminary stretch |
(57) Process of carbon fiber manufacture wherein the polyacrylonitrile precursor is stretched
prior to oxidation in limited temperature range. Process permits greater throughput
in precursor manufacture and reduces flaws in the precursor because significant stretching
is at lower line speeds typically used for oxidation and carbonization in making carbon
fiber.