METHOD OF DYEING POLYACRYLONITRILE FIBRES IN BULK

摘要

The novel improved process of the invention for spin-dyeing of acid-modified polymers or copolymers of acrylonitrile with basic dyestuffs wherein the spinning solutions of the polymers contain the basic dyestuffs in form of their free dyestuff bases as anhydro or carbinol bases is conducted with completely transparent spinning solutions avoiding clogging and mechanical abrasion of the spinning nozzles and yields filaments and fibers which do not show matting effects but have a high tinctorial strength and good and improved fastnesses to rubbing, to light and to wet-processing.