A new method of dyeing polyacrylonitrile fibres at high temperatures, in the presence of hydroxyl‐amine sulphate, is described in detail. The hydroxylamine salt seems to modify the nitrile groups into new functions containing amino groups, which confer on the fibre affinity for soluble and insoluble dyes of different classes— acid, direct, metal‐complex, phthalocyanine, etc.
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Khachoyan et al. (1958) studied this question.
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