Patent ID: 7999086
Filing Date: 2011-08-16
Classification: C09B

Abstract:
1. A method of conditioning an azo pigment containing carboxylic ester groups, comprising the step of subjecting a crude azo pigment, wherein the crude azo pigment contains carboxylic ester groups, to a treatment with glycol monoalkyl ethers or with mixtures of glycols and glycol dialkyl ethers and, optionally, glycol monoalkyl ethers and wherein the crude azo pigment containing carboxylic ester groups is a pigment selected from the group consisting of C.I. Pigment Yellow, 182, C.I. Pigment Red 119, 139, 175, 188, 208, 220, 221, 248, a diazo pigment of the general formula (1) where R R R and at least one radical from R where R R R R and at least one radical from R A is a fused heterocyclic ring in 3,4- or 4,5- or 5,6-position and is constructed from the groups of the general formula (3), (4), (5) or (6): where R