| abstract |
(57) [Abstract] [Purpose] No nozzle or orifice clogging, flight direction bending, ink drop amount change, or flight speed change resulting in printing defects even when used and stored for a long time. Good printing is possible. [Structure] After thoroughly mixing and stirring each ink material, Filter through a 8 μm membrane filter and filter the filtrate to 40 The mixture was heated to 0 ° C and left for 1 day. After that, the filtrate is further cooled to 5 ° C. and left for 1 day, and then refiltered with a 0.8 μm membrane filter while maintaining 5 ° C., and the content of fatty acid ester is 0.6% by weight or less. An aqueous ink was produced. |