A method for dispersing a pigment comprises dispersing 100 parts by weight of a pigment, from 0.1 to 30 parts by weight of a pigment dispersing agent of formula (I) and from 5 to 300 parts by weight of a water-based resin in from 100 to 2000 parts by weight of an aqueous medium having a water-soluble organic solvent concentration of from 4 to 15% by weight,
wherein P is an organic dyestuff residue or a heterocyclic ring residue; X is a direct bond or a divalent binding group consisting of a chemically rational combination of 1 to 50 atoms selected from S, C, N, O and H, Y is a direct bond, -N (R4)-R3 or -O-R3, in which R3 is an optionally substituted alkylene group having 1 to 10 carbon atoms or an optionally substituted pheneylene group and R4 is H, an alkyl group having 1 to 18 carbon atoms or -R3-N(R1)R2 wherein each of R1 and R2 is independently an optionally substituted alkyl group having 1 to 18 carbon atoms or is a heterocyclic ring which may contain N, O or S; Z is a hydroxyl group, an alkoxy group having 1 to 4 carbon atoms or Y-N(R1)R2 wherein Y, R1 and R2 are as defined above; and n is an integer of 1 to 3.
分散
颜料的方法包括将 100 份(重量)
颜料、0.1 至 30 份(重量)式(I)
颜料分散剂和 5 至 300 份(重量)
水基
树脂分散在 100 至 2000 份(重量)
水介质中,
水介质的
水溶性有机溶剂浓度为 4 至 15%(重量)、
其中 P 是有机
染料残留物或杂环残留物;X 是直接键或二价结合基团,二价结合基团由选自 S、C、N、O 和 H 的 1 至 50 个原子的
化学合理组合组成,Y 是直接键、-N (R4)-R3 或 -O-R3,其中 R3 是具有 1 至 10 个碳原子的任选取代的亚烷基或任选取代的亚苯基,R4 是 H、具有 1 至 18 个碳原子的烷基或-R3-N(R1)R2,其中 R1 和 R2 各自独立地是具有 1 至 18 个碳原子的任选取代的烷基或杂环,可包含 N、O 或 S;Z 是羟基、具有 1 至 4 个碳原子的烷氧基或 Y-N(R1)R2,其中 Y、R1 和 R2 如上所定义;以及 n 是 1 至 3 的整数。