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Black water-based ink composition

  • US 20050126435A1
  • Filed: 11/22/2004
  • Published: 06/16/2005
  • Est. Priority Date: 11/25/2003
  • Status: Active Grant
First Claim
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1. A black water-based ink composition, containing:

  • at least one type of black dye selected from the group consisting of compounds expressed by the following formula (1) and salts thereof;

    embedded image(in the formula (1), R1 is a phenyl group having a substituent or a naphthyl group having a substituent, R2 is a phenylene group having a substituent or a naphthylene group having a substituent, R3 is a 5- to 7-member heterocyclic group having a substituent and at least one double bond, and the substituents in R1 to R3 are independently selected from the group consisting of OH, SO3H, PO3H2, CO2H, NO2, C1 to C4 alkyl groups, alkyl groups having a substituent, C1 to C4 alkoxy groups, alkoxy groups having a substituent, amino groups having a substituent, and phenyl groups having a substituent), and at least one type of dye other than said black dye, wherein the hue is adjusted by adding the dye other than the black dye.

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