JP2008308664A5 - - Google Patents

Claims (16)

An ink set having a plurality of inks,
The ink set includes at least a pigment ink and a dye ink;
The pigment ink contains at least water, a surfactant, a self-dispersing pigment, and a poor solvent and / or salt for the self-dispersing pigment, the surfactant is a polyoxyethylene alkyl ether, and The dynamic surface tension of the pigment ink at a lifetime of 50 milliseconds is higher than 47 mN / m,
The ink set, wherein the dye ink contains at least water, a surfactant, and a dye. The ink set according to claim 1, wherein the pigment ink has a dynamic surface tension of 53 mN / m or less at a lifetime of 50 milliseconds. The ink set according to claim 1 or 2, wherein the pigment ink has a dynamic surface tension of 28 mN / m or more and 40 mN / m or less at a lifetime of 5000 msec. The content (% by mass) of the surfactant in the pigment ink is 0.10% by mass or more and 0.75% by mass or less based on the total mass of the pigment ink. The ink set described in 1. Evaporation when the self-dispersing pigment is prepared by preparing a liquid containing a minimum amount of sodium chloride that changes the average particle diameter of the self-dispersing pigment using the pigment ink, and evaporating the liquid in the rate of 30%, the increase rate a ₁ of the average particle diameter determined by the following equation (1) is according to any one of claims 1 to 4, which is a satisfying self-dispersion pigment of a ₁ ≧ 15 Ink set.
Self having the condition that the increase rate A ₂ of the average particle diameter obtained by the following formula (2) at the evaporation rate of 50% when the liquid is evaporated satisfies the condition of A ₂ > (5/3) × A ₁ The ink set according to claim 5 , wherein the ink set is a dispersed pigment.
The ink set according to any one of claims 1 to 6 , wherein a dynamic surface tension of the dye ink at a lifetime of 50 milliseconds is 42 mN / m or more and less than 49 mN / m. The ink according to any one of claims 1 to 7 , wherein a difference between a dynamic surface tension at a lifetime of 50 milliseconds and a dynamic surface tension at a lifetime of 500 milliseconds of the dye ink is 7 mN / m or more. set. The ink set according to any one of claims 1 to 8, wherein the surfactant in the dye ink is polyoxyethylene alkyl ether. The content (% by mass) of the surfactant in the dye ink is 0.10% by mass or more and 2.0% by mass or less based on the total mass of the dye ink. The ink set described in 1. The ink set according to claim 1, wherein the ink set is for inkjet. The inkjet recording method which discharges an ink with an inkjet method, The said ink is the pigment ink and dye ink which comprise the ink set of any one of Claims 1 thru | or 11 , The inkjet recording method characterized by the above-mentioned. The inkjet recording method according to claim 12 , wherein the inkjet method is an inkjet recording method in which ink is ejected from a recording head by the action of thermal energy. The ink cartridge provided with the ink storage part which stores an ink WHEREIN: The ink stored in the said ink storage part is the pigment ink and the dye ink which comprise the ink set of any one of Claim 1 thru | or 11. An ink cartridge characterized by that. An ink storage portion for storing ink, a recording unit and a recording head for ejecting ink, ink contained in the ink containing portion, the ink set according to any one of claims 1 to 11 A recording unit comprising a pigment ink and a dye ink. The ink set according to any one of claims 1 to 11 , wherein the ink stored in the ink storage unit is an ink jet recording apparatus including an ink storage unit that stores ink and a recording head that discharges ink. An ink jet recording apparatus comprising: a pigment ink and a dye ink constituting the ink.