Patent ID: 6482256
Filing Date: 2002-11-19
Classification: C09D

Abstract:
An ink set comprising first and second magenta ink compositions different from each other in color density, wherein the first magenta ink composition has a higher color density than the second magenta ink composition which has a lower color density,said first magenta ink composition with higher color density containing as a colorant a compound represented by formula (III) wherein&agr; represents a C1-C4 alkyl or alkoxy group or an OHâ€”, SO3Hâ€”, or COOM-substituted phenyl or naphthyl group; &bgr; represents a hydrogen atom or a group represented by formula â€ƒwherein R1 represents a hydrogen atom or an OHâ€” or COOH-substituted C1-C4 alkyl group, R2 represents an OHâ€”, OCH3â€”, OC2H5â€”, SO3Mâ€”, or COOM-substituted C1-C4 alkyl or phenyl group, and R3 represents an OH, COOH, or NHR4 wherein R4 represents an SO3Mâ€” or COOH-substituted C1-C4 alkyl group; and M represents a hydrogen atom, lithium, sodium, potassium, ammonium or an organic amine, said second magenta ink composition with lower color density containing as a colorant a compound represented by formula (IV): whereinM represents a hydrogen atom, lithium, sodium, potassium, ammonium, or an organic amine; R5 represents a hydrogen atom, a chlorine atom or a group represented by formula â€ƒwherein X represents an anilino group substituted by at least one SO3M and Y represents OH, a chlorine atom, or a morpholino group; and R6 represents a hydrogen atom, a chlorine atom, SO3M, or a C1-C4 alkyl group.