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Ink, ink cartridge, and inkjet recording apparatus

a technology of inkjet recording and ink cartridge, which is applied in the direction of inks, printing, transportation and packaging, etc., can solve the problems of poor settling property and re-dispersibility, difficult to obtain visible prints, and poor susceptibility to colorant settling, so as to achieve easy redistribution

Inactive Publication Date: 2015-07-02
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about an ink that contains inorganic pigment as a colorant. The invention aims to prevent the inorganic pigment from settling and make it easy to redisperse if it does settle. The technical effect of this invention is that it solves the conventional problem of the inorganic pigment settling and makes it easier to use in ink.

Problems solved by technology

When such inks are printed on a transparent base material or a base material having a low luminosity, a visible print is difficult to obtain because a contrast or a clear color development performance may not be obtained.
Because such inorganic pigments generally have a specific gravity greater than that of organic pigments, their problem is susceptibility to colorant settling.
However, titanium dioxide is not used as a colorant; titanium dioxide particles suppress agglutination with an electrolytic effect.
However, the resin having an anionic group in this proposal is a water-soluble polymer (a water-soluble styrene acrylic-based resin is used in an Example), and not present in the ink in the form of resin particles, leading to a problem that a settling property and re-dispersibility are poor.

Method used

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  • Ink, ink cartridge, and inkjet recording apparatus
  • Ink, ink cartridge, and inkjet recording apparatus
  • Ink, ink cartridge, and inkjet recording apparatus

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

of Inorganic Pigment having Surface Hydrophobicity

[0139]—Preparation of Titanium Dioxide Surface-Treated with Silicone—

[0140]Titanium dioxide (CR-50 manufactured by Ishihara Sangyo Kaisha, Ltd.) (10 parts by mass) that had been dried with a reduced-pressure dryer at 110° C. for 2 days was added in a 200 mL flask equipped with an isobaric pressure funnel, which was then purged with a nitrogen gas. A solution obtained by diluting a reactive silicone oil (KF-99 manufactured by Shin-Etsu Chemical Co., Ltd.) (2 parts by mass) with a dehydrated toluene (40 parts by mass) was added gradually thereto through the dropping funnel, and they were stirred. After the dropping was completed, they were heated in an oil bath to distill toluene away, and then reacted at 150° C. for 3 hours. After the reaction was completed, a solid content was recovered, washed sufficiently with toluene and then with methanol, and after this, dried at reduced pressure at 60° C. for 1 day, to thereby obtain titanium d...

preparation example 2

of Inorganic Pigment having Surface Hydrophobicity

[0141]—Preparation of Titanium Dioxide Surface-Treated with Alkyl—

[0142]A 5 mM octadecyltrimethoxysilane toluene solution (50 parts by mass), titanium dioxide (CR-50 manufactured by Ishihara Sangyo Kaisha, Ltd.) (10 parts by mass) that had been dried with a reduced-pressure dryer at 110° C. for 2 days, and zirconia beads having a diameter of 4 mm (200 parts by mass) were added and sealed in a glass bottle purged with a nitrogen gas, and after this, reacted for 2 days while being rotated with a mix rotor. After this, the beads were separated therefrom through a sieve, and then a solid content was filtered and recovered. After this, the solid content was washed sufficiently with toluene and then with methanol. After this, the solid content was dried at reduced pressure at 60° C. for 1 day, to thereby obtain titanium dioxide surface-treated with alkyl.

preparation example 3

of Inorganic Pigment having Surface Hydrophobicity

[0143]—Preparation of Silicon Dioxide Surface-Treated with Silicone—

[0144]Silicon dioxide surface-treated with silicone was obtained in the same manner as in Preparation Example 1 of the inorganic pigment having a surface hydrophobicity, except that spherical silica having a particle diameter of 0.4 μm (manufactured by Sakai Chemical Industry Co., Ltd.) was used.

[0145]In the evaluation of surface hydrophobicity, pure water (10 g) and an inorganic pigment (2 g) were added in a 30 mL sample bottle (SV-30 manufactured by Nichidenrika-Glass Co., Ltd.) in which a stirring bar was put, stirred and mixed at 400 rpm for 10 minutes with a stirrer (MS-2T manufactured by Ishii Laboratory Works Co., Ltd.), and then kept stationary for 30 minutes. In this case, when the inorganic pigment was wholly floating without having settled, it was judged to have a “surface hydrophobicity”. When the inorganic pigment had settled even partially, it was judge...

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Abstract

Provided is an ink containing at least: an inorganic pigment having a surface hydrophobicity; resin particles; and water.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an ink, an ink cartridge, and an inkjet recording apparatus.[0003]2. Description of the Related Art[0004]Most ordinary inkjet recording inks are highly transparent inks intended for being printed on white recording media. When such inks are printed on a transparent base material or a base material having a low luminosity, a visible print is difficult to obtain because a contrast or a clear color development performance may not be obtained. Hence, attempts are being made to use white inks having a high hiding power.[0005]As such white inks, inks containing a white inorganic pigment as a colorant are used. Because such inorganic pigments generally have a specific gravity greater than that of organic pigments, their problem is susceptibility to colorant settling. For example, ink cartridges housing an ink containing a commercially available inorganic pigment as a colorant (containing titani...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D11/322C09D11/102C09C1/36C09D11/107
CPCC09D11/322C09D11/107C09D11/102C08K9/02C09C1/3653C08K9/04C09C1/3669C01P2004/62C01P2006/22C08K9/06C09C1/30C09C1/3684Y10T428/24901B41J2/17503B41J2/2114B41M5/50C09D11/36
Inventor OKADA, TAKASHIINOUE, TOMOHIROHABASHI, HISASHIKOYANO, MASAYUKI
Owner RICOH KK
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