Patent ID: 8066808
Filing Date: 2011-11-29
Classification: C09D

Abstract:
1. An ink set for ink-jet recording comprising a plurality of color inks, wherein the following formulae (a) to (d) are satisfied: where, in the formulae (a) to (d), “A” is an OD value before a light fastness test performed for a first single-color patch; “B” is an OD value after a light fastness test performed for a first single-color patch; “C” is an OD value before an ozone resistance test performed for a second single-color patch; “D” is an OD value after an ozone resistance test performed for a second single-color patch; “Zmax” is a maximum of all the total OD reduction rates (Z); “Zmin” is a minimum of all the total OD reduction rates (Z); a first single-color patch and a second single-color patch are prepared separately by conducting printing on ink jet recording paper by use of each of all the color inks under the same printing conditions; the light fastness test is performed by irradiating the first single-color patch at an illuminance of 93 klx with light, emitted from a xenon lamp, for 40 hours at a temperature of 25° C. and a relative humidity of 50%; and the ozone resistance test is performed by exposing the second single-color patch to an atmosphere with an ozone concentration of 2 ppm for 40 hours at a temperature of 24° C. and a relative humidity of 60%.