MAGENTA RECORDING INK COMPOSITION, INKJET RECORDING METHOD, AND INK RECORDED MATTER

• US 20100285287A1
• Filed: 01/20/2009
• Published: 11/11/2010
• Est. Priority Date: 01/22/2008
• Status: Active Grant

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Natori, Yuji, Matsuyama, Akihiko
• Granted Patent: US 8,523,992 B2
• Time in Patent Office: Days
• US Class Current: 428/207
• CPC Class Codes: C09B 67/0033 Blends of pigments; Mixtured crystals; Solid solutions
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: Y10T 428/24901 including coloring matter

Abstract

The present invention provides a magenta recording ink composition including at least a solid solution pigment (A) containing quinacridone, a lake pigment (B) having a xanthene structure, an aqueous solvent, and water, wherein the solid solution pigment (A) has visible light absorption peaks at wavelength ranges of from 510 nm to 530 nm and from 540 nm to 560 nm, and a mass ratio (B/A) of the lake pigment (B) to the solid solution pigment (A) falls within the range of 0.1 to 5.

Claims

1. A magenta recording ink composition comprising:

a solid solution pigment (A) comprising quinacridone;

a lake pigment (B) having a xanthene structure;

an aqueous solvent; and

water,

wherein the solid solution pigment (A) has visible light absorption peaks at wavelength ranges of from 510 nm to 530 nm and from 540 nm to 560 nm, and a mass ratio (B/A) of the lake pigment (B) to the solid solution pigment (A) falls within the range of 0.1 to 5.

2. The magenta recording ink composition according to claim 1, wherein the solid solution pigment (A) is

a solid solution (a) comprising an unsubstituted quinacridone and a dimethylquinacridone,

a solid solution (b) an unsubstituted quinacridone and a dichloroquinacridone, or

a mixture of (a) and (b), and

the lake pigment (B) is C.I. Pigment Violet 1 and/or C.I. Pigment Violet 2.

3. The magenta recording ink composition according to claim 1, wherein the aqueous solvent comprises at least one selected from the group consisting of glycerin, 1,3-butandiol, 3-methyl-1,3-butandiol, hexylene glycol, polyethylene glycol, polypropylene glycol, 1,5-pentanediol, 1,6-hexanediol, propylene glycol, dipropylene glycol, and trimethylolpropane.

4. The magenta recording ink composition according to claim 1, wherein each of the solid solution pigment (A) and the lake pigment (B) is dispersed with a dispersant represented by formula (1) or (2),

A1-O—

(CH₂CH₂O)_k—

SO₃M1 

 

(1)

wherein A1 is a branched or linear alkyl group comprising 8 to 12 carbon atoms, a benzyl group, a styrenated phenol group, a distyrenated phenol group, or a β

-naphthyl group;

k is an integer from 5 to 30; and

M1 is an alkali metal, ammonium, phosphonium, or alkanol amine;

A1-O—

(CH₂CH₂O)_i—

H 

 

(2)

wherein A1 is a branched or linear alkyl group comprising 8 to 12 carbon atoms, a benzyl group, a styrenated phenol group, a distyrenated phenol group or a β

-naphthyl group; and

i is an integer from 20 to 60.

5. The magenta recording ink composition according to claim 4, further comprising a water-soluble polymer having a weight average molecular mass of 2,000 to 50,000.

6. The magenta recording ink composition according to claim 1, further comprising polymer microparticles having a volume average particle diameter of 20 nm to 150 nm and/or a polymer emulsion comprising the microparticles.

7. The magenta recording ink composition according to claim 1, further comprising a polyol comprising 8 or more carbon atoms, or glycol ether comprising 8 or more carbon atoms.

8. The magenta recording ink composition according to claim 1, having

a viscosity of 5 mPa·

s to 30 mPa·

s at 25°

C.;

a surface tension of 20 mN/m to 35 mN/m; and

a pH of 7 to 11.

13. The magenta recording ink composition according to claim 2, wherein the aqueous solvent comprises at least one selected from the group consisting of glycerin, 1,3-butandiol, 3-methyl-1,3-butandiol, hexylene glycol, polyethylene glycol, polypropylene glycol, 1,5-pentanediol, 1,6-hexanediol, propylene glycol, dipropylene glycol, and trimethylolpropane.

14. The magenta recording ink composition according to claim 2, wherein each of the solid solution pigment (A) and the lake pigment (B) is dispersed with a dispersant represented by formula (1) or (2),

A1-O—

(CH₂CH₂O)_k—

SO₃M1 

 

(1)

wherein A1 is a branched or linear alkyl group comprising 8 to 12 carbon atoms, a benzyl group, a styrenated phenol group, a distyrenated phenol group, or a β

-naphthyl group;

k is an integer from 5 to 30; and

M1 is an alkali metal, ammonium, phosphonium, or alkanol amine;

A1-O—

(CH₂CH₂O)_i—

H 

 

(2)

wherein A1 is a branched or linear alkyl group comprising 8 to 12 carbon atoms, a benzyl group, a styrenated phenol group, a distyrenated phenol group, or a β

-naphthyl group; and

i is an integer from 20 to 60.

15. The magenta recording ink composition according to claim 3, wherein each of the solid solution pigment (A) and the lake pigment (B) is dispersed with a dispersant represented by formula (1) or (2),

A1-O—

(CH₂CH₂O)_k—

SO₃M1 

 

(1)

wherein A1 is a branched or linear alkyl group comprising 8 to 12 carbon atoms, a benzyl group, a styrenated phenol group, a distyrenated phenol group, or a β

-naphthyl group;

k is an integer from 5 to 30; and

M1 is an alkali metal, ammonium, phosphonium, or alkanol amine;

A1-O—

(CH₂CH₂O)_i—

H 

 

(2)

wherein A1 is a branched or linear alkyl group comprising 8 to 12 carbon atoms, a benzyl group, a styrenated phenol group, a distyrenated phenol group, or a β

-naphthyl group; and

i is an integer from 20 to 60.

16. The magenta recording ink composition according to claim 14, further comprising a water-soluble polymer having a weight average molecular mass of 2,000 to 50,000.

17. The magenta recording ink composition according to claim 15, further comprising a water-soluble polymer having a weight average molecular mass of 2,000 to 50,000.

18. The magenta recording ink composition according to claim 2, further comprising polymer microparticles having a volume average particle diameter of 20 nm to 150 nm and/or a polymer emulsion comprising the microparticles.

19. The magenta recording ink composition according to claim 3, further comprising polymer microparticles having a volume average particle diameter of 20 nm to 150 nm and/or a polymer emulsion comprising the microparticles.

20. The magenta recording ink composition according to claim 4, further comprising polymer microparticles having a volume average particle diameter of 20 nm to 150 nm and/or a polymer emulsion comprising the microparticles.

9. An inkjet recording method comprising:

printing an ink on a recording medium by making a magenta recording ink composition adhere on the recording medium,

wherein the magenta recording ink composition comprises a solid solution pigment (A) comprising quinacridone, a lake pigment (B) having a xanthene structure;

an aqueous solvent; and

water,

wherein the solid solution pigment (A) has visible light absorption peaks at wavelength ranges of from 510 nm to 530 nm to 560 nm, and a mass ratio (B/A) of the lake pigment (B) to the solid solution pigment (A) falls within the range of 0.1 to 5.

10. The inkjet recording method according to claim 9, wherein the printing is performed such that the ink is ejected by the action of thermal energy applied to the ink.

11. The inkjet recording method according to claim 9, wherein the printing is performed such that the ink is ejected by the action of mechanical energy transmitted to the ink.

12. A recorded matter comprising:

an image formed by an inkjet recording method,

wherein the inkjet recording method comprises printing an ink on a recording medium by making a magenta recording ink composition adhere on the recording medium,

wherein the magenta recording ink composition comprises;

a solid solution pigment (A) comprising quinacridone, a lake pigment (B) having a xanthene structure;

an aqueous solvent; and

water,

wherein the solid solution pigment (A) has visible light absorption peaks at wavelength ranges of from 510 nm to 530 nm and from 540 nm to 560 nm, and a mass ratio (B/A) of the lake pigment (B) to the solid solution pigment (A) falls within the range of 0.1 to 5.