Aqueous ink, ink set, image forming method and image forming apparatus

A water-based ink and image technology, applied in reproduction/marking methods, ink, printing, etc., can solve the problems of high surface tension, reduced image fixing ability, low permeability of recording medium, etc., and achieve high image density and excellent ejection stability. Effect

Inactive Publication Date: 2008-11-12
CANON KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has been found that when a pigment ink and a color ink containing the dispersant are used so as to overlap each other, since the surface tension of such color ink is high, there occurs a problem that the fixing ability of an image formed using the pigment ink decreases, Thus its permeability into the recording medium is low

Method used

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  • Aqueous ink, ink set, image forming method and image forming apparatus
  • Aqueous ink, ink set, image forming method and image forming apparatus
  • Aqueous ink, ink set, image forming method and image forming apparatus

Examples

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Embodiment

[0143] Hereinafter, the present invention will be described more specifically by the following Examples and Comparative Examples. However, the present invention is not limited to these Examples unless exceeding the gist of the present invention. Incidentally, "%" used below is based on mass unless otherwise specified.

[0144]

[0145] (preparation of pigment dispersion solution A)

[0146] will have 10 copies with 210m 2 carbon black having a specific surface area and a DBP oil absorption value of 74 mL / 100 g, 20 parts of a polymer obtained by using a styrene-acrylic acid copolymer having an acid value of 200 and a weight-average molecular weight of 10,000 obtained in a 10 mass % sodium hydroxide aqueous solution Mix with 70 parts of water. The mixture was subjected to dispersion treatment by sand milling for 1 hour, then centrifuged to remove coarse particles, and the mixture thus treated was filtered under pressure through a microfilter (product of Fuji Photo Film Co. ...

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PUM

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Abstract

An aqueous ink to be used together with a pigment ink containing a pigment and a polymer, wherein the aqueous ink contains a reactive component for destabilizing the dispersion state of the pigment, the dynamic surface tension of the aqueous ink at a lifetime of 30 milliseconds is 41 mN / m or more, and the dynamic surface tension of the aqueous ink at a lifetime of 500 milliseconds is from 28 mN / m or more to 38 mN / m or less as determined by a maximum bubble pressure method.

Description

technical field [0001] The present invention relates to an aqueous ink particularly suitable for an inkjet recording method, and an ink set, an image forming method, and an image forming apparatus using the same. Background technique [0002] The inkjet recording method is widely used in various fields due to features that recording can be performed with low noise, and high-resolution images can be obtained at high speed by using a recording head having high-density multi-ejection ports. [0003] Heretofore, inks (pigment inks) containing pigments (pigment inks) which are recording product coloring materials capable of obtaining high image density and excellent fastness have been used as inks used in the inkjet recording method. Regarding the pigment ink, there have been proposed methods containing a dispersant such as a polymer based on the purpose of stably dispersing a pigment in the ink, improving scratch resistance and highlighter resistance of an image, and forming a s...

Claims

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Application Information

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IPC IPC(8): C09D11/10B41J2/01B41M5/00C09D11/00C09D11/322C09D11/324C09D11/326C09D11/38C09D11/40
Inventor 西野勇辉宅原浩幸真田干雄冈村大二森部镰志工藤智
Owner CANON KK
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