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Ink, ink cartridge and ink jet recording method

An inkjet and pigment technology, applied in the direction of copying/marking methods, inks, fibrous fillers, etc., can solve the problem of image image density reduction, etc., and achieve the effects of high image density, excellent evaporation stability, and excellent image density

Active Publication Date: 2012-02-08
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, a recording medium with high ink permeability tends to lower the image density of the formed image

Method used

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  • Ink, ink cartridge and ink jet recording method
  • Ink, ink cartridge and ink jet recording method
  • Ink, ink cartridge and ink jet recording method

Examples

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Embodiment

[0065] Hereinafter, the present invention will be described in more detail by the following examples and comparative examples. However, the present invention is not limited by the following examples as long as the gist of the present invention is not exceeded. Incidentally, all representations of "parts" or "parts" and "%" used below are based on mass unless specifically stated.

[0066] Preparation of Pigment Dispersion:

[0067] The amount of functional groups introduced in the pigment:

[0068] First, a method for measuring the amount of functional groups introduced into the pigment will be described. Liquid A was prepared by diluting the pigment dispersion liquid with pure water so that the content of the pigment to be measured was about 0.03%. Under the conditions of 5°C, 80,000rpm and 15 hours, the pigment dispersion liquid was ultracentrifuged to collect the supernatant liquid from which the bisphosphonic acid type self-dispersible pigment was removed, and the liquid...

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PUM

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Abstract

Disclosed herein are an ink containing a self-dispersible pigment and a salt, wherein the self-dispersible pigment is a pigment to the surface of a particle of which a functional group containing at least a group having a hydrogen bonding property and two phosphonic acid groups is bonded, counter ions of the two phosphonic acid groups containing one of K + and NH 4 + ; the salt is constituted by combining at least one cation of K + and NH 4 + + with at least one anion selected from the group consisting of Cl - , Br - , I - , ClO - , ClO 2 - , ClO 3 - , ClO 4 - , NO 2 - , NO 3 - , SO 4 2- , CO 3 2- , HCO 3 - , HCOO - , (COO - ) 2 , COOH(COO - ), CH 3 COO - , C 2 H 4 (COO - ) 2 , C 6 H 5 COO - , C 6 H 4 (COO - ) 2 , PO 4 3- , HPO 4 2- and H 2 PO 4 - ; a cation concentration in the ink is 0.04 mol / L or more; and the viscosity of a liquid obtained by evaporating 15% by mass of the ink is less than 3.5 mPas at 25 DEG C.

Description

technical field [0001] The present invention relates to an ink, an ink cartridge and an inkjet recording method. Background technique [0002] In recent years, inks used in inkjet recording methods have been required to further improve the image density of recorded images. In recording media on which images are recorded, various plain papers differing in ink permeability are available, and the difference in ink permeability affects image characteristics. In particular, a recording medium with high ink permeability tends to lower the image density of a formed image. In recent years, inkjet recording methods have been widely used; therefore, images formed thereby have been required to achieve high image density regardless of the kind of recording media including such highly permeable recording media. [0003] In order to meet the above requirements, there are proposals to improve the quality of printed characters and image density by inks containing self-dispersible pigments...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/02B41J2/175B41J2/01B41M5/00C09C1/58C09C3/08C09D7/62C09D11/00C09D11/322C09D11/324C09D11/326C09D11/38
CPCC09D11/38C09C1/56C09D7/1225C09C3/08C09D11/324C01P2006/22C09D7/62
Inventor 合田惠吾小笠原干史渡边智成藤冈文章永井庄一安田亚希子
Owner CANON KK
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