Disazo pigment mixtures

摘要

A mixture of azo pigments of formulae


in which R1 is C1-4alkyl and R2 is optionally substituted 1,4-phenylene; substituted 4,4'-diphenylene; or 1,4- or 1,5-naphthylene, the mixture containing from 8 to 20% mole of benzoic acid ester residues and from 92 to 80% mole of terephthalic acid ester residues, are useful for pigmenting in the mass synthetic polymers or resins.