PROCESS FOR CONTINUOUSLY DYEING FILAMENTS OR SLIVERS OF WET-SPUN ACRYLONITRILE COPOLYMERS

摘要

1483311 Dyeing wet-spun acrylonitrile copolymer filaments BAYER AG 16 Jan 1975 [16 Jan 1974] 1914/75 Heading DIB A wet-spun acrylonitrile copolymer sliver or filament is dyed by a continuous process comprising washing the unstretched sliver or filament at up to 70‹C; squeezing out and then drying by heat to a residual liquid content of at most 10% and a residual solvent content of at most 4% of the residual liquid content; dyeing in a dye bath over a period up to 60 sees at 20-100‹C; stretching the dyed filament or sliver to 2.5 to 6.5 times its original length; then aftertreating the stretched and dyed filament or sliver. The stretching may be carried out in the dye bath and the washing is preferably at room temperature. The acrylonitrile copolymer preferably contains up to 15% of at least one other ethylenically unsaturated monomer and at least 85% acrylonitrile. The copolymer preferably contains at least 150 milliequivalents of acid groups/kg of polymer.