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US 4,266,940 AGranted
Method for dyeing acrylonitrile polymer and copolymer fibres
AssigneeYorkshire Chemicals Limited
InventorsDavid Blackburn, Malcolm S. Wild
Life of this patent
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Abstract
There is disclosed a process for the coloration of wet spun acrylic and modacrylic fibres in the gel form which comprises using a cationic dye, or its dye bases, which are substantially insoluble in water but soluble or partly soluble in organic solvents. There are also disclosed acrylic fibres so colored.
Claims9
A process for the colouration of wet spun acrylic or modacrylic fibres in gel form, said process comprising
- dyeing said fibres at 20.degree.-110.degree. C. from a bath in which a cationic dye or dye base is dissolved, wherein said bath contains a highly polar organic solvent in which acrylonitrile polymer and copolymer of said fibers are soluble and in which said dye and dye base are soluble or partly soluble;
- removing said fibres after colouration from said bath;
- and
- rinsing said coloured fibres with an aqueous medium without substantially removing said dye from said fibres;
- wherein said dye has the formula
- D.sup.+ X.sup.-
- where D represents a cationic dye radical containing a chromophoric group and X represents an anion that renders the dye substantially insoluble in water;
- and
- wherein said highly polar organic solvent is selected from the group consisting of dimethylformamide, dimethylacetamide, dimethylsulphoxide, ethylene glycol carbonate and mixtures thereof.
6 more elements
Dependencies are inferred from the claim text.