Ink for ink jet recording apparatuses and image forming method
AssigneeKYOCERA Document Solutions Inc.
InventorNoriaki OZAWA
Life of this patent
Estimating the term…
Abstract
An ink for ink jet recording apparatuses contains water and a pigment dispersion containing a resin and carbon black. The ink additionally contains a surfactant including a compound expressed by the general formula (I) below, and the mass average molecular weight of the resin, the DBP oil absorption of the carbon black, the content of the resin with respect to the content of the carbon black in the pigment dispersion, and the dried-by-evaporation viscosity V40, which is the viscosity of the ink at the dryness of 40% by mass, are all within the respective predetermined ranges.
Claims6
An ink for inkjet recording apparatuses, comprising:
- water;
- a pigment dispersion;
- and a surfactant including a compound expressed by the general formula (I) below,
- wherein the pigment dispersion includes a resin and carbon black,
- a mass average molecular weight of the resin is from 10,000 to 40,000,
- a DBP oil absorption of the carbon black is from 40 g/100 g to 80 g/100 g,
- a content of the resin in the pigment dispersion is from 30% by mass to 60% by mass with respect to a content of the carbon black,
- a dried-by-evaporation viscosity of the ink is 50 mPa·s or less, the dried-by-evaporation viscosity defining a viscosity of the ink at a dryness of 40% by mass,
- wherein in the general formula (I),
- R1 represents CAH2A+1,
- R2 represents C1-BH2B+1,
- A and B each represent an integer 1 or larger,
- A+B represents an integer from 6 to 10,
- -E-O— represents —CH2CH2—O—,
- —P—O— represents —CH2CH(CH3)—O—,
- n and m each represents a positive number,
- n+m represents a number from 5 to 11,
- n>m is satisfied, and
- a repetitive sequence of (-E-O—) and (—P—O—) is either a random sequence or a block sequence.
Dependencies are inferred from the claim text.