Recording ink, ink/media set, ink cartridge, inkjet recording method and inkjet recording apparatus

Patent metadata

Field	Value
Publication number	US-8927623-B2
Application number	US-9112907-A
Country	US
Kind code	B2
Filing date	Aug 20, 2007
Priority date	Aug 22, 2006
Publication date	Jan 6, 2015
Grant date	Jan 6, 2015

Abstract

To provide a recording ink which contains at least a water-dispersible colorant, a water-dispersible resin, a wetting agent, a surfactant and water, wherein the content of the wetting agent in the recording ink is in the range of from 20% by mass to 35% by mass, the total solid content of the water-dispersible colorant and the water-dispersible resin in the recording ink is in the range of from 12% by mass to 40% by mass, the water-dispersible resin contains fluorine resin particulates, and the ratio A:B, where A is the solid content of the water-dispersible resin in the recording ink and B is the solid content of a pigment contained in the water-dispersible colorant in the recording ink, is in the range of 0.5 to 8.

First claim

The invention claimed is:

1. A recording ink, comprising:
a water-dispersible colorant,
a water-dispersible resin,
wetting agents, which are glycerin and any one of 1,3-butanediol, and 3-methyl-1,3-butanediol,
a surfactant, and
water,
wherein the content of the wetting agent in the recording ink is in the range of from 20% by mass to 35% by mass,
the total solid content of the water-dispersible colorant and the water-dispersible resin in the recording ink is in the range of from 20% by mass to 27% by mass,
the water-dispersible resin contains fluorine resin particulates, and
the ratio A:B, where A is the solid content of the water-dispersible resin in the recording ink and B is the solid content of a pigment contained in the water-dispersible colorant in the recording ink, is in the range of 0.5 to 8.

2. The recording ink according to claim 1 , wherein the water-dispersible colorant contains at least a hydrophilic group at its surface and is a pigment that is water-dispersible under the absence of a dispersant.

3. The recording ink according to claim 1 , wherein the water-dispersible colorant is a polymer emulsion that is composed of polymer particulates containing a water-insoluble and/or hardly-soluble coloring material.

4. The recording ink according to claim 1 , wherein
the water-dispersible colorant is a dispersed pigment containing a pigment, a pigment dispersant and a polymer dispersion stabilizer, and
the polymer dispersion stabilizer is any one of alpha-olefin/maleic anhydride copolymer represented by the following structural formula (1), styrene-(meth)acryl copolymers, water-soluble polyurethane resins and water-soluble polyester resins

Where R represents an alkyl group, and n represents an integer of 30 to 100.

5. The recording ink according to claim 4 , wherein
the polymer dispersion stabilizer has a weight average molecular weight of 20,000 or lower and an acid value of 40 mgKOH/g to 400 mgKOH/g, and is dissolved in any one of an alkali solution and alkali water-solution having an alkalinity value equivalent to or higher than the acid value to be used.

6. The recording ink according to claim 4 , wherein the pigment dispersant is an anion surfactant or a nonionic surfactant having an HLB value of 10 to 20.

7. The recording ink according to claim 6 , wherein the nonionic surfactant is any one of polyoxyethylene-3-naphthylether, polyoxyethylene laurylether and polyoxyethylene styrene phenylether.

8. The recording ink according to claim 1 , wherein the fluorine resin particulates contain a fluoroolefin unit and have a minimum film forming temperature of 30 EC or lower.

9. The recording ink according to claim 1 , wherein the surfactant comprises at least one selected from silicone surfactants and fluorine surfactants.

10. The recording ink according to claim 1 , wherein the viscosity thereof at 25 EC is in the range of from 5 mPaXs to 20 mPaXs, and the surface tension thereof is 35 mN/m or lower.

11. An ink/media set, comprising:
a recording ink, and a recording medium,
wherein the recording medium comprises a base and a coating layer which is provided on at least one surface of the base, and
the transfer amount of pure water to the recording medium, measured with a dynamic scanning absorptometer, is in the range of from 2 ml/m 2 to 35 ml/m 2 at a contacting time of 100 ms and in the range of from 3 ml/m 2 to 40 ml/m 2 when measured at a contacting time of 400 ms, and wherein the recording ink comprises a water-dispersible colorant, a water-dispersible resin, wetting agents, a surfactant, and water,
wherein the wetting agents are glycerin and any one of 1,3-butanediol, and 3-methyl-1,3-butanediol,
wherein the content of the wetting agent in the recording ink is in the range of from 20% by mass to 35% by mass,
the total solid content of the water-dispersible colorant and the water-dispersible resin in the recording ink is in the range of from 12% by mass to 40% by mass,
the water-dispersible resin contains fluorine resin particulates, and
the ratio A:B, where A is the solid content of the water-dispersible resin in the recording ink and B is the solid content of a pigment contained in the water-dispersible colorant in the recording ink, is in the range of 0.5 to 8.

12. An ink cartridge, comprising a container that comprises a recording ink, wherein the recording ink comprises a water-dispersible colorant, a water-dispersible resin, wetting agents, a surfactant, and water,
wherein the wetting agents are glycerin and any one of 1,3-butanediol, and 3-methyl-1,3-butanediol,
wherein the content of the wetting agent in the recording ink is in the range of from 20% by mass to 35% by mass,
the total solid content of the water-dispersible colorant and the water-dispersible resin in the recording ink is in the range of from 20% by mass to 27% by mass,
the water-dispersible resin contains fluorine resin particulates, and
the ratio A:B, where A is the solid content of the water-dispersible resin in the recording ink and B is the solid content of a pigment contained in the water-dispersible colorant in the recording ink, is in the range of 0.5 to 8.

13. An inkjet recording method, comprising ejecting drops of a recording ink by applying an impulse thereto to record an image,
wherein the recording ink comprises a water-dispersible colorant, a water-dispersible resin, wetting agents, a surfactant, and water,
wherein the wetting agents are glycerin and any one of 1,3-butanediol, and 3-methyl-1,3-butanediol,
wherein the content of the wetting agent in the recording ink is in the range of from 20% by mass to 35% by mass,
the total solid content of the water-dispersible colorant and the water-dispersible resin in the recording ink is in the range of from 20% by mass to 27% by mass,
the water-dispersible resin contains fluorine resin particulates, and
the ratio A:B, where A is the solid content of the water-dispersible resin in the recording ink and B is the solid content of a pigment contained in the water-dispersible colorant in the recording ink, is in the range of 0.5 to 8.

14. The inkjet recording method according to claim 13 , wherein the impulse is at least any one selected from heat, pressure, vibration and light.

15. An inkjet recording apparatus, comprising an ink jet unit comprising a recording ink, the ink jet unit configured to eject drops of the recording ink by applying an impulse thereto to record an image,
wherein the recording ink comprises a water-dispersible colorant, a water-dispersible resin, wetting agents, a surfactant, and water,
wherein the wetting agents are glycerin and any one of 1,3-butanediol, and 3-methyl-1,3-butanediol,
wherein the content of the wetting agent in the recording ink is in the range of from 20% by mass to 35% by mass,
the total solid content of the water-dispersible colorant and the water-dispersible resin in the recording ink is in the range of from 20% by mass to 27% by mass,
the water-dispersible resin contains fluorine resin particulates, and
the ratio A:B, where A is the solid content of the water-dispersible resin in the recording ink and B is the solid content of a pigment contained in the water-dispersible colorant in the recording ink, is in the range of 0.5 to 8.

16. The inkjet recording apparatus according to claim 15 , wherein the impulse is at least any one selected from heat, pressure, vibration and light.

17. An ink recorded matter, comprising:
a recording medium an

Assignees

• Goto Hiroshi
• Ricoh Co Ltd

Inventors

• Goto Hiroshi

Classifications

• C09D11/40 Primary

  Ink-sets specially adapted for multi-colour inkjet printing · CPC title

• C09D11/30 Primary

  Inkjet printing inks · CPC title

• B41J2/01

  Ink jet · CPC title

• B41M5/50

  Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording {(printing on organic plastics using a printer's form B41M1/30; printing on pre-treated paper with a printer's form B41M1/36)} · CPC title

• Y10T428/24802

  Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] · CPC title