| 摘要 |
PURPOSE:To realize stable delivery of a recording fluid even under variable drive conditions or during long-term service, by dispersing a pigment wherein pigment particles of at least a specified diameter account for at most a specified proportion of the total pigment in a liquid medium consisting mainly of water. CONSTITUTION:In a recording fluid comprising a dispersion of a pigment in a liquid medium consisting mainly of water, pigment particles having a diameter of 0.6mum or more account for 10vol.% or less of the total pigment. If a larger amount of coarse particles are present in an ink, a change occurs in the ink dispersion when thermal energy is applied to the ink with a heating head, so that a foreign substance will deposit on the heated surface. An ink containing a large amount of fine pigment particles produces a dispersion stable even when thermal energy is applied, so that it hardly causes deposition. Accordingly, the use of an ink containing a pigment having the above-mentioned particle diameter can realize stable delivery even under variable drive conditions or during long-term service. |
