(19)
(11) EP 0 372 622 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.04.1991 Bulletin 1991/15

(43) Date of publication A2:
13.06.1990 Bulletin 1990/24

(21) Application number: 89203017.2

(22) Date of filing: 28.11.1989
(51) International Patent Classification (IPC)5: D01F 6/18, D01D 5/06, D01F 9/22, D01F 6/38
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR LI LU NL SE

(30) Priority: 02.12.1988 IT 2283688

(71) Applicant: ENICHEM FIBRE S.p.A.
I-90139 Palermo (IT)

(72) Inventors:
  • Tasselli, Franco
    I-75023 Montalbano Ionico, Matera (IT)
  • Cognigni,Franco
    I-20097 San Donato Milanese, Milan (IT)
  • Di Bonito, Renato
    I-80121 Naples (IT)
  • Mariano, Armando
    I-75100 Matera (IT)

(74) Representative: Fusina, Gerolamo et al
Ing. Barzanò & Zanardo Milano S.p.A, Via Borgonuovo, 10
I-20121 Milano
I-20121 Milano (IT)


(56) References cited: : 
   
       


    (54) Acrylic precursor for carbon fibres and method for its preparation


    (57) A method for preparing acrylic precursors with improved characteristics suitable for transformation into carbon fibres of superior mechanical characteristics comprises wet-spinning an acrylic polymer dissolved in dimethylacetamide followed by coagulation in a solvent-non solvent binary mixture bath of rigorously controlled composition and temperature, and a series of controlled-condition stretching operations with interposed washing stages, followed by yarn drying before its final collection.
    The method is characterised essentially by its coagulation stage, which is conducted under such rigorously controlled bath temperature and composition conditions as to obtain at the end of the process an acrylic yarn which has a perfectly compact structure practically free of flaws (voids), a perfectly circular cross-section and mechanical characteristics which are distinctly better than those of acrylic yarns of identical composition obtained by spinning processes of the known art.
    The specific destination of the acrylic yarn is the production of high-performance carbon fibres.







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