Abstract
Recently the azoic coupling components containing polycyclic nucleus have become very important because of their production of characteristic shades and of their very high substantivity for cotton.
In regard to these properties we prepared a number of coupling components containing fluorene ring in their molecule and examined their dyeing character on cotton.
These components consist of two series. One of which contains arylides of 3-hydroxyfluorene-2-carboxylic acid, i. e. anilide, o-, m-toluidide and o-, p-anisidide. Although the solubility of these compounds in alkaline grounding bath was not enough, and they developed fully only when pH of the developing bath was adjusted at near 7, they gave very valuable khaki or olive shade on cotton. The light-fastness of their dyeing was fair or good and wash fastness was excellent.
Another series of the coupling components prepared contains fluoreneamides of 2-hydroxy-3-naph-thoic acid. Their solubility in alkaline grounding bath was poor except 3-methoxyl-2-fluorenea-mide. 3-Fluoreneamide and 3-methoxy-2-fluoreneamide dyed cotton very effectively compared with 2-fluoreneamide or 7-methxoxy-2-fluoreneamide. Light-fastness of these dyeings was good, especially 3-methoxy-2-fluoreneamide gave cxcellent. Wash-fastness was equally excellent.
