New anthrapyridone pigments

The invention comprises anthrapyridone pigments of the formula wherein R is H, alkyl, or cycloalkyl, X is H, acetyl or carboalkoxy and an optionally substituted g -quinolone residue is attached to the anthrapyridone ring in the 5:6- or 8:9-positions, the N of the quinolone being attached in the 6- or 8-position. The pigments may be prepared by ring-closing an anthrapyridone of the formula wherein one of A1 and A11 is H, the other an optionally substituted 2-carboxy-anilino group, e.g. by treating with chlorosulphonic acid optionally in the presence of H2SO4, or the -COOH group may be converted to -COCl and the acid chloride heated in o-dichlorobenzene or, again, by heating with benzoyl chloride in o-dichlorobenzene. The alkyl group R and the alkoxy of X preferably contain 1-4 C atoms. The substituents in the quinolone residue may be halogen atoms or carboxylic acid groups. The pigments may be employed as dry powders to colour rubber, synthetic textiles of polyvinyl chloride, polyethylene or cellulose acetate, paints or printing inks, for the mass-coloration of textile materials of viscose, cellulose acetate, polyacrylonitrile, polyamides, polyesters and polyolefins and as aqueous dispersions for emulsion paints, wallpaper and flushing into paint and lithographic vehicles. Examples are given.