Red acid dyes for injet printing and paper dyeing

摘要

The present invention provides water-soluble acid dyes of the formula (1) ;in which;R¹ is AXCOOM, AXSO₃M, OR⁴ or NR⁵R⁶,;A is NR⁷ or S,;X is a (C₁-C₁₆)-alkylene or arylene radical optionally substituted with hydroxyl-, carboxyl- or amino-groups;;R⁴, R⁵ and R⁶ independently of one another are hydrogen or (C₁-C₄)-alkyl or substituted (C₁-C₄)-alkyl;R⁷ is hydrogen, methyl or ethyl;;M is a cation and;n is 0 or 1.;which are suitable for printing natural and synthetic fiber materials for recording liquids, especially for the inkjet process, and for pulp-dyeing paper.