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US 3,996,192 AGranted
Spin-dyeing of acrylonitrile homopolymers and copolymers
AssigneeHoechst Aktiengesellschaft
InventorsManfred Hahnke, Theodor Papenfuhs
Life of this patent
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Abstract
Sparingly soluble to insoluble salts of dyestuff bases having one or more arylamino groups are useful for the spin-dyeing of acid-modified polymers containing acrylonitrile units.
Claims14
In a process for the spin-dyeing of acid-modified polymers containing acrylonitrile units with basic dyestuffs the improvement comprising adding to the spinning solution a salt of a dyestuff containing at least one arylamino group which salt is sparingly soluble or insoluble in water.
Dependencies are inferred from the claim text.