Dyestuffs derived from triphenylmethane, their preparation and use

Abstract

Dyestuffs of the formula: ##STR1## in which R.sub.2 and R.sub.4 which are the same or different each represent a hydrogen atom or an alkyl, hydroxyalkyl or cyanethyl group, one of the substituents R.sub.1 and R.sub.3 represents the 2,2,2-trifluoroethyl group and the other substituent represents an alkyl group or the 2,2,2-trifluoroethyl group, the ring A is unsubstituted by or substituted by one or 2 chlorine atoms or an alkoxy or alkyl group, the rings B.sub.1 and B.sub.2 are each unsubstituted or substituted by at least one alkyl or alkoxy group and X represents a colorless monovalent anion; process for the preparation of such dyestuffs; process for the coloration with such dyestuffs based on a polymer or copolymer of acrylic nitrile or on polyamides or polyesters which have been modified by anionic groups; and fibres based on a polymer or copolymer of acrylic nitrile or on polyamides or polyesters which have been modified by anionic groups colored by means of such dyestuffs.

Dependencies are inferred from the claim text.