(19)
(11) EP 0 863 232 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.06.1999 Bulletin 1999/22

(43) Date of publication A2:
09.09.1998 Bulletin 1998/37

(21) Application number: 98103645.2

(22) Date of filing: 02.03.1998
(51) International Patent Classification (IPC)6: D01F 6/60
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 03.12.1997 JP 333344/97
04.03.1997 US 811282

(71) Applicant: Kansai Research Institute (KRI)
Osaka-shi, Osaka 541-0046 (JP)

(72) Inventor:
  • Kawai, Kigen
    Mino-shi, Osaka 562-0046 (JP)

(74) Representative: Blumbach, Kramer & Partner GbR 
Radeckestrasse 43
81245 München
81245 München (DE)

   


(54) Highly oriented polymer fiber and method for making the same


(57) The present invention provides a highly oriented aramid fiber with high tensile strength, high tensile modulus and low breakage elongation by spinning liquid crystal polymers such as aramids and drafting the polymer in or adjacent to a first coagulating bath. A polymer solution with concentration of 4-24 weight % is extruded as a stream (9) into a non-coagulating fluid (10), and the stream (9) is stretched in the non-coagulating fluid (10) and passed through a first coagulating bath (4) where it is drafted by using a drafting roller (3), so that the polymer concentration of the flue is increased sufficient to form fibers. As a result, a highly oriented aramid fiber with tensile strength of 1500-5000 MPa, tensile modulus of 200-500 GPa, and the % elongation of 0.8-1.4 is provided.






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