GB613836A - Manufacture of vat dyestuffs - Google Patents

Abstract

(1) 5 - Amino - 1 - (Bz.1 - benzanthronyl) amino-anthraquinone or (2) its alkaline condensation product is heated with an acylating agent which introduces the residue of an o-halogen-benzene monocarboxylic acid, and the product of (1) is then treated with an alkaline condensing agent which contains no hydroxyl group or only a small quantity of admixtures containing hydroxyl groups in order to prevent saponification of the acylamino groups. The products may be halogenated. The acylating agents may be anhydrides or chlorides of o-halogenbenzene monocarboxylic acids, e.g. 2-chloro and 2-bromo-benzoyl chloride and 24-dichlorobenzoyl chloride. A solvent such as nitrobenzene, naphthalene, or dichlorobenzene may be employed. The products dye or print wool, silk, cotton, linen, regenerated cellulose and nylon olive shades. Examples describe: (1) the acylation of the alkaline condensation product with 2-chlorbenzoyl chloride, and also the chlorination of the product with sulphuryl chloride and its bromination in glacial acetic acid; (2) the acylation of the alkaline condensation product with 2.4-dichlorobenzoyl chloride; (3) the acylation of 5-amino-5 - amino - 1 - (Bz.1 - benzanthronyl) - 1 - aminoanthraquinone with 2-chlorbenzoyl chloride, followed by condensation with sodium alcoholate in p aniline. Specifications 339,396, [Class 2 (iii)], 423,450 and 431,654 are referred to.