Process for the production of hydrophilic filaments and...

Details Process for the production of hydrophilic filaments and... Process for the production of hydrophilic filaments and...

D - Textiles, Paper

01

D

18/584, 18/603

D01D 5/247 (2006.01) D01F 6/18 (2006.01) D01F 8/04 (2006.01) D01F 8/08 (2006.01)

Patent

CA 1117265

ABSTRACT OF THE DISCLOSURE The invention relates to a process for the production of hydrophilic filaments or fibres having a sheath/core structure, a porosity of at least 10 % and a water retention capacity of at least 10 % and having a fibre swelling factor which is lower than the water retention capacity. The process is carried out by spinning a solution of a fibre forming synthetic polymer, especially an acrylonitrile polymer by the dry jet wet-spinning method wherein immediately on leaving the spinning jet and prior to coagulation in the precipitation bath the filaments or fibres are contacted with steam or with the vapor of another coagulation initiating liquid which initiates coagulation of the as yet unsolidified filaments, the filaments then being fully coagulated in a precipitation bath. The dry jet wet spinning process provides an highly porous and hydrophilic fibre by means of the steam or vapor of another liquid which is used as a first precipitation medium.

308941

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