Patent ID: 7699919
Filing Date: 2010-04-20
Classification: C09D

Abstract:
1. An ink composition comprising at least a coloring agent and a medium, wherein the ink composition has a dynamic surface tension, measured by a maximum bubble pressure method at a temperature of 24 to 26° C., and a static surface tension measured at a temperature of 24 to 26° C. which satisfy the following relation (1): said composition further comprising a surfactant which is present at least in an amount of a critical micelle concentration, wherein a bubble frequency, at which the dynamic surface tension is measured, is within a range from 0.5 to 35 Hz, and wherein the surfactant is a compound represented by any one of following general formulas (III), (IV) and (V) wherein, in the general formula (III), h represents an integer or a fractional number from 0 to 11, i represents an integer or a fractional number from 0 to 11, i represents an integer or a fraction number from 3 to 50, and a sum of h and i (h+i) represents an integer or a fractional number from 9 to 11, in the general formula (IV), w represents an integer or a fractional number from 0 to 11, x represents an integer or a fractional number from 5 to 9, y represents an integer or a fraction number from 2.5 to 5, z represents an integer or a fractional number from 0 to 9; and a sum of w and z (w+z) represents an integer or a fractional number from 9 to 11, and in the general formula (V), p represents an integer or a fractional number from 0 to 78, q represents an integer or a fractional number from 2 to 15, and r represents an integer or a fraction number from 0 to 18.