| 摘要 |
PURPOSE: A dispersant composition used for manufacturing aqueous pigmented ink for ink jet is provided, which can exhibit stable atomizing rate for an extended time even at a fine atomizing nozzles without any clogging phenomena even using a cheap compound of starting material and is very useful for manufacturing aqueous pigmented ink for ink jet that is not coagulated by pigmented powder. CONSTITUTION: The dispersant composition is characterized in that it contains 10 to 70 wt.% of random polymer (formula I) with an average molecular weight of 3,000 to 50,000; 15 to 85 wt.% of random polymer (formula II) with an average molecular weight of 3,000 to 25,000; and 0.5 to 20 wt.% of polymer (formula III) with an average molecular weight of 10,000 to 150,000. In the formula I and II, y and y' are respectively in the range of 0.1 to 3, with the proviso that x and x' are respectively 1. The dispersant composition further comprises at least one compounds selected from formulae IV, wherein y and y' are respectively in the range of 0.1 to 3, with the proviso that x and x' are respectively 1; W represents Li, Na, K or NH4.
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