GB189809435A - A Process for Preparing Diazotisable and Non-diazotisable Compounds by Means of Primary Aromatic Monamines and Aromatic Diamines, and the Manufacture of Colouring Matters derived therefrom. - Google Patents

Abstract

9435. Prud'homme, M. April 23. Amines. - (1) Aromatic primary monamines, such as aniline and alpha-naphthylamine, are converted into new compounds, which are soluble in alkalies and not diazotizable, but capable of combining with diazo compounds, by heating their hydrochlorides in water to 70‹ or 75‹ C. and then adding formaldehyde and sodium bisulphite. After cooling, the product is filtered off and washed. (2) Aromatic primary diamines, such as m- or p-phenylenediamine, benzidine, tolidine, azoxyaniline, azoxytoluidine, dianisidine, ethoxy- or methoxy-benzidine, or the like, when similarly treated, yield products which are soluble in alkalies and are diazotizable to half the extent of the parent compound. These compounds appear to be sulphonated or sulphinated. Dyes, artificial, which are very soluble in water and difficult to precipitate by common salt, and are capable of dyeing wool in an acid bath and cotton in a neutral or alkaline bath, are produced by diazotizing the above-described derivatives of aromatic diamines and combining these diazo compounds with phenols, naphthols, amidophenols, amidonaphthols, primary, secondary, or tertiary aromatic amines, or sulphonic or carboxylic acids thereof, or with the above-described derivatives of aromatic primary monamines or diamines. Examples are given in which violet, orange, blue, yellowish garnet, black, greenish yellow, poppyred, &c. shades are obtained by the use of R-salt, Piria's naphthionic acid, Schaeffer's salt, G-salt, amidonaphthol-G, H-salt, chromotrope acid, salicylic acid, &c.