| 摘要 |
An ink jet ink containing a coloring material and a polymer particle, wherein the polymer particle has a core portion and a shell portion, the shell portion contains a copolymer A having a unit derived from a compound (a1) represented by a general formula (1) of R1-(C2H4O)n-R2 where R1 is at least one selected from a vinyl group, an allyl group, an acryloyl group and a methacryloyl group, R2 is a hydrogen atom or an alkyl group, and n is 30-100, and a unit derived from an alpha,beta-unsaturated hydrophobic compound (a2), a proportion of the unit derived from the compound (a1) to the copolymer A is 50-90% by mass or less, a proportion of the unit derived from the compound (a2) to the copolymer A is 10-50% by mass or less, and the core portion contains a polymer of an alpha,beta-unsaturated hydrophobic compound (b).
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