申请人:FUJIFILM Corporation
公开号:EP2130881A1
公开(公告)日:2009-12-09
The present invention provides a pigment dispersion containing at least a pigment at a concentration of from 2 to 50 mass% in the pigment dispersion, and a polymer having from 2 to 50 mass% of repeating units represented by the following formula (1) and from 2 to 40 mass% of repeating units represented by the following formula (2), and having a weight average molecular weight of 10,000 to 500,000. In formula (1), R1 represents a hydrogen atom or a methyl group, I represents -CO-, -COO-, etc., R2 represents an alkyl group having 1 to 4 carbon atoms. In formula (2), R4 represents a hydrogen atom or a methyl group, J represents -CO-, -COO-, etc., R5 represents a hydrogen atom, an alkyl group, an aryl group, etc., W represents a single bond or a bivalent linking group, and P represents a heterocyclic residue having a hetero ring contained in an organic pigment.
本发明提供了一种颜料分散体,其中至少含有一种颜料,其在颜料分散体中的浓度为 2 至 50 质量%,以及一种聚合物,该聚合物具有 2 至 50 质量%的下式 (1) 所代表的重复单元和 2 至 40 质量%的下式 (2) 所代表的重复单元,且其重量平均分子量为 10,000 至 500,000。在式 (1) 中,R1 代表氢原子或甲基,I 代表 -CO-、-COO- 等,R2 代表具有 1 至 4 个碳原子的烷基。在式 (2) 中,R4 代表氢原子或甲基,J 代表-CO-、-COO-等,R5 代表氢原子、烷基、芳基等,W 代表单键或二价连接基团,P 代表有机颜料中含有杂环的杂环残基。