Novel dye salts of cationic dyes, having thiocyanatometallate or cyanatometallate complex anions for spin dyeing acid modified polyacrylonitrile

Abstract

Dye salts of a mono- or polycationic dye where the anion conforms to a general formula (1) or (2) [Me (XCN).sub.4 ].sup.2(-) (1) [Me (SCN).sub.6 ].sup.n(-) (2) in which Me in the formula (1) is the divalent zinc cation, the divalent iron cation, the divalent cobalt cation, the divalent tin cation or the divalent copper cation, and Me in the formula (2) stands for the divalent iron cation, the divalent nickel cation or the trivalent iron cation, X stands for an oxygen or sulfur atom and n depending on the valency of the corresponding metal cation, denotes the number 4 or 3. The novel dye salts can be obtained for example from aqueous solution or suspension by reacting the corresponding cationic dye which has a customary anion with a metal cation Me donor compound and an alkali metal thiocyanate or cyanate, alkaline earth metal thiocyanate or cyanate or ammonium thiocyanate or cyanate. They are used in particular in the spin-dyeing of acid-modified polyacrylonitrile and copolymers thereof.

Dependencies are inferred from the claim text.