(19)
(11) EP 0 436 377 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.02.1992 Bulletin 1992/08

(43) Date of publication A2:
10.07.1991 Bulletin 1991/28

(21) Application number: 90314224.8

(22) Date of filing: 24.12.1990
(51) International Patent Classification (IPC)5: D01F 11/14
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 29.12.1989 JP 340897/89

(71) Applicant: Tonen Corporation
Tokyo (JP)

(72) Inventors:
  • Saito, Makoto
    Iruma-gun, Saitama-ken (JP)
  • Miyazaki, Makoto
    Saitama-ken (JP)
  • Inoue, Hiroshi
    Iruma-gun, Saitama-ken (JP)

(74) Representative: Allam, Peter Clerk et al
LLOYD WISE, TREGEAR & CO., Commonwealth House, 1-19 New Oxford Street
London WC1A 1LW
London WC1A 1LW (GB)


(56) References cited: : 
   
       


    (54) Carbon fibers sized with a sizing agent


    (57) Petroleum pitch-derived carbon fibers coated with a sizing agent are disclosed. The sizing agent includes the following ingredients (a)-(c):

    (a) an epoxy resin having a number average molecular weight of 550-1600 wherein the content of epoxy resin components which are equivalent to polystyrenes having a molecular weight of 10000 or more with respect to retention time in gel permeation chromatography is less than 5 mol %,

    (b) at least one ether compound of the general formula:


            X - O - Y


    wherein X represents a polyoxyalkylene group and Y represents an aromatic group; and

    (c) an ester compound selected from unsaturated fatty acid esters of an aliphatic monohydric alcohol and aliphatic monocarboxylic acid esters of an unsaturated aliphatic monohydric alcohol, wherein the amounts of ingrdients (a)-(c) are 55-84 %, 15-35 % and 1-25 %, respectively, based on the total weight of ingredients (a)-(c).







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