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Ink, ink accommodation container, image formation method, and image formation device

A technology for storing containers and inks, applied in the directions of printing devices, inks, coatings, etc., can solve the problems of rapid instability, and achieve the effect of improving image density

Active Publication Date: 2019-09-03
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent Document 1 discloses a polymer having a set index value, which forms a stable dispersion when taken into an inkjet ink composition as a colorant, and rapidly becomes unstable when it comes into contact with paper.

Method used

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  • Ink, ink accommodation container, image formation method, and image formation device
  • Ink, ink accommodation container, image formation method, and image formation device
  • Ink, ink accommodation container, image formation method, and image formation device

Examples

Experimental program
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Effect test

Embodiment

[0141] Hereinafter, examples are shown, and the present invention will be described more specifically, but the present invention is not limited to these examples. "Parts" and "%" in examples are "parts by mass" and "% by mass" unless otherwise specified. The molecular weight of the copolymer obtained in embodiment and comparative example is measured as follows:

[0142]

[0143] Using GPC (Gel Permeation Chromatography), determine the molecular weight under the following conditions:

[0144] Device: HLC-8320GPC (manufactured by TOSOH Corporation)

[0145] Column: TSK G2000HXL and G4000HXL (manufactured by TOSOH Corporation)

[0146] Temperature: 40℃

[0147] Solvent: THF (tetrahydrofuran)

[0148] Flow rate: 0.6mL / min

[0149] 1 mL of a copolymer having a concentration of 0.5% by mass was injected, and then, from the molecular weight distribution of the obtained copolymer measured under the above-mentioned conditions, the weight average of the copolymer was calculated u...

Synthetic example 1

[0150] [Synthesis Example 1: Synthesis of Copolymer 1]

[0151] After slowly adding 20.0 g of biphenyl-3-carboxylic acid (manufactured by Tokyo Chemical Industry Co., Ltd.) to 33.0 g of diethylene glycol (manufactured by Tokyo Chemical Industry Co., Ltd.) heated to 80° C., 1.0 g of sulfuric acid was added and heated to 115° C. , stirred for 4 hours. After cooling to 40° C., 8.5 g of an aqueous solution of sodium bicarbonate dissolved in 50 mL of water was added, followed by stirring for 15 minutes. To the obtained mixture, 50 mL of toluene was added to isolate the organic phase, and then the toluene was distilled off. Using a dichloromethane / methanol (volume ratio 98 / 2) mixed solvent as an eluent, the residue was purified by silica gel column chromatography to obtain 22.5 g of intermediate (1).

[0152] Intermediates (1)

[0153]

[0154] 5.23 g of methacrylic acid chloride (Methacrylic acid chloride, produced by Tokyo Chemical Industry Co., Ltd.), 14.3 g of intermediate...

Synthetic example 2

[0158] [Synthesis Example 2: Synthesis of Copolymer 2]

[0159] After slowly adding 20.0 g of biphenyl-3-carboxylic acid (manufactured by Tokyo Chemical Industry Co., Ltd.) to 90.0 g of hexaethylene glycol heated to 80° C., 1.0 g of sulfuric acid was added, heated to 115° C., and stirred for 4 hours. After cooling to 40° C., 8.5 g of an aqueous solution of sodium bicarbonate dissolved in 50 mL of water was added, followed by stirring for 15 minutes. To the obtained mixture, 50 mL of toluene was added to isolate the organic phase, and then the toluene was distilled off. Using a dichloromethane / methanol (volume ratio 98 / 2) mixed solvent as an eluent, the residue was purified by silica gel column chromatography to obtain 40.1 g of intermediate (2).

[0160] Intermediates (2)

[0161]

[0162] 5.23 g of methacrylic acid chloride (Methacrylic acid chloride, produced by Tokyo Chemical Industry Co., Ltd.), 23.1 g of intermediate (2), and 5.32 g of triethylamine (manufactured by ...

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Abstract

The invention relates to an ink, an ink accommodation container, an image formation method and an image formation device. To overcome a situation that there are each proposals for improving one of image concentration, storage stability and beading, but image concentration, storage stability and beading cannot be improved by each proposals. The ink contains water, a coloring material and a copolymer, in which the copolymer has a constitutional unit of styrene and a constitutional unit having a naphthyl group or a biphenyl group.

Description

technical field [0001] The present invention relates to ink, an ink storage container, an image forming method, and an image forming apparatus. Background technique [0002] Compared with other recording methods, the inkjet recording method has the advantages of simple process, easy full color, and high-resolution images can be obtained even with a simple device configuration. and other uses have been popularized. As inks for inkjet recording, dye inks containing water-soluble dyes have been mainly used in the past, but in recent years, the development of pigment inks containing water-insoluble pigments that are excellent in water resistance and light resistance has also progressed. [0003] When recording by inkjet recording method for office use, etc., it is required to use a water-absorbing recording medium such as plain paper as a recording medium to form an image with high image density. However, if pigment ink is used to record on plain paper, the pigment may not sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/30C09D11/324
CPCC09D11/30C09D11/324C09D11/106C09D11/322C09D11/326C09D125/04B41J2/17509B41J2/17513B41J2/17553B41J29/02B41J29/13C09D11/107C08F212/08C08F220/303C08F220/307C08F222/102C09D11/38C09D11/40
Inventor 原田成之山崎拓哉
Owner RICOH KK
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