Patent ID: 8684509
Filing Date: 2014-04-01
Classification: C09D

Abstract:
1. An ink jet ink, comprising: a polyurethane polymer and a pigment, the polyurethane polymer having units derived from a polyisocyanate, a polyether polyol having no acid group, and a diol having an acid group, the pigment being dispersed using a polymer other than the polyurethane polymer, wherein the polyether polyol having no acid group contains at least one selected from poly(ethylene glycol), poly(propylene glycol), poly(1,2-butylene glycol), and poly(1,3-butylene glycol) and has a number-average molecular weight of 450 or more and 4,000 or less, the ratio of the percentage (% by mole) of urethane bonds in the polyurethane polymer to the percentage (% by mole) of urea bonds in the polyurethane polymer is 85.0/15.0 or more and 98.5/1.5 or less, the diol having an acid group is at least one selected from dimethylolpropionic acid and dimethylolbutanoic acid, the percentage (% by mole) constituted by the units derived from the diol having an acid group at the terminal of the polyurethane polymer with respect to all the units derived from the diol having an acid group is 10% by mole or more and 60% by mole or less, and the acid value of the polyurethane polymer resulting from the unit(s) derived from the diol having an acid group is 40 mgKOH/g or more and 140 mgKOH/g or less.