abstract |
The invention relates to a process for mass dyeing of polyacrylonitrile, wherein there is incorporated into a solution of acrylonitrile polymer or copolymer a pigment preparation which comprisesn 10 to 60% by weight of a pigment, 15 to 85% by weight of a glycol-based solvent, 5 to 25% by weight of a surfactant, and 0 to 10% by weight of customary additives, the percentages being based on the total weight of the pigment preparation. |