Highly shrinkable acrylic fibres or filaments

Details Highly shrinkable acrylic fibres or filaments Highly shrinkable acrylic fibres or filaments

D - Textiles, Paper

01

D

18/634

D01D 5/12 (2006.01) D01F 6/18 (2006.01) D02J 1/22 (2006.01)

Patent

CA 1079465

Abstract of the Disclosure The invention relates to highly shrinkable fibres or filaments of acrylonitrile polymers or copolymers which have a shrinkability of at least 35 % and a fibre strength of at least 2 p/dtex. The invention relates further to a process for the production of these fibres or filaments which comprises prestretching dry-spun polymer in a ratio of up to 1 : 3.0 at a temperature of from 60 to 100°C; after stretching in a ratio of up to 1 : 2.5 at a temperature of from 60 to 90°C, the total stretching ratio of the two stretching stages carried out in an aqueous medium amounting to at least 1 : 3.0; crimping the stretched and spun polymer while still wet at a temp- erature of up to 90°C; drying at a temperature of up to 70°C and, if fibres are required, converting filaments to fibres.

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