Azo pigment composition, useful for the pigmentation of high molecular natural or synthetic organic compounds and for the preparation of printing ink, comprises 4,4'-diamino-dicyclohexyl-methane with specified content of trans, trans-isomer

摘要

Azo pigment composition (I) comprises 4,4'-diamino-dicyclohexyl-methane, comprising at least 25% of its trans, trans-isomer. Independent claims are included for: (1) the preparation of the composition comprising adding 4,4'-diamino-dicyclohexyl-methane containing at least 25% of trans, trans portion during or after azo-coupling, but before the isolation of azo pigment; and (2) a printing ink comprising (I).