| 摘要 |
An aqueous pigment dispersion containing as the dispersing agent a phosphate ester salt having the general formula: <IMG> wherein: R and R' are the same or different linear or branched alkyl groups of 2 to 12 carbon atoms; k and 1 are the same or different integers having 2 value of 1 or 2; x and y are the same or different integers having values of greater than 1 but less than 13; and, M is a cation selected from the group consisting of potassium, sodium and ammonium. The dispersing agent is especially useful to disperse azo type pigments. The resulting pigment dispersion exhibits improved stability.
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