Bayer Aktiengesellschaft

Manfred Reichardt

Alfred Nogaj

Martin Wandel

Christian Pieper

Helmut Engelhard

Eckhard Gartner

Geert Christoph

Surinder S Sandhu

Ernst Gutschik

High-strength filaments of dry-spun polyacrylonitrile are obtained by a process in which tension-reduced spun filaments are continuously stretched hydrothermally in one or more stages: where it involves several stages, stretching is carried out at a temperature of the stretching medium gradually increasing from stage to stage up to .theta.=.theta..sub.n and, in the final (n-th) stage, to a degree of at least 50% of the maximum degree of stretching; where it is carried out in a single stage, stretching is carried out at the optimal stretching temperature .theta..sub.n, after which the material is further treated in the conventional way, optionally with fixing of the stretched material to a pre-determined extent.

Process for the production of high-strength filaments from dry-spun

The invention relates to fibre or filament mixtures consisting of high shrinkage side-by-side bifilar (mod)acrylic fibres or filaments separately containing TiO.sub.2 and carbon black and of normal fibres or filaments of polyamide, polyester, polyalkylene, poly(mod)acrylic, wool or cotton.

Fibre and filament mixtures containing high-shrinkage bifilar

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Dormagen, Germany

Manfred Reichardt