Patent ID: 9499704
Filing Date: 2016-11-22
CPC Classification: B41J,C09D

Claim Text:
1. An aqueous ink for ink jet, comprising a urethane resin; wherein the urethane resin has a unit derived from a polyether polyol and a unit containing an acidic group, an acid value of the urethane resin is 40 mg KOH/g or more and 140 mg KOH/g or less, a molar ratio of a proportion in % by mole of a urethane bond in the urethane resin to a proportion in % by mole of a urea bond is 80.0/20.0 or more, and the acidic groups in the urethane resin are neutralized with an alkali metal ion and at least one ammonium type ion selected from ammonium ion and an organic ammonium ion, with a neutralization ratio of all acidic groups in the urethane resin being 80% or more and a neutralization ratio with the ammonium type ion being 1% or more and less than 45%.