Black ink composition for ink jet recording

• US 6,277,184 B1
• Filed: 09/02/1999
• Issued: 08/21/2001
• Est. Priority Date: 11/20/1998
• Status: Expired due to Fees

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Kato, Shinichi
• Primary Examiner(s): KLEMANSKI, HELENE G
• Application Number:
  US09/388,724
• Time in Patent Office: 719 Days
• Field of Search: 106/31.28, 106/31.52, 106/31.58
• US Class Current: 106/31.28
• CPC Class Codes: C09D 11/324 containing carbon black
• CPC Class Codes: C09D 11/328 characterised by dyes

Abstract

Disclosed is a black ink composition for ink jet recording, comprising at least carbon black, a black dye, a water-soluble organic solvent, and water, the black dye being a black dye represented by formula (I), C.I. Direct Black 154, or C.I. Direct Black 168:

wherein M represents a cation of a group selected from the group consisting of a hydrogen atom, an alkali metal, ammonia, and an organic amine; m is 1 or 2; and n is 0 or 1.

Claims

1. A black ink composition for ink jet recording, comprising at least carbon black, a dispersant for dispersing the carbon black, a black dye represented by formula (V) and/or formula (VI), triethylene glycol monobutyl ether, an acetylene glycol represented by formula (II), glycerin, an ammonium salt for a styrene-acrylic acid copolymer, and water:

wherein X represents CH₂—

CH₂—

O, R¹ and R² each represent an iso-butyl group, R² and R³ each represent a methyl group, and m+n is 0 to 30,

the weight ratio of the carbon black to the black dye represented by formula (V) and/or formula (VI) being in the range of 2.5;

1 to 7;

1,

the content of the triethylene glycol monobutyl ether being 2 to 12% by weight based on the ink composition,

the content of the acetylene glycol represented by formula (II) being 0.5 to 1.2% by weight based on the ink composition,

the content of glycerin being 2 to 20% by weight based on the ink composition,

the content of the ammonium salt of the styrene-acrylic acid copolymer being 0.5 to 4% by weight based on the ink composition.

2. The ink composition according to claim 1, which has a surface tension of 20 to 40 mN/m at a temperature of 0 to 50°

C.

3. An ink jet recording method utilizing the ink composition of claim 1 comprising the steps of:

ejecting a droplet of said ink composition; and

depositing the droplet onto a recording medium to perform printing.

4. A recording medium recorded by the ink jet recording method according to claim 3.