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Ink, ink container, Liquid Discharging Device, and Image Forming Method and apparatus thereof

An ink and organic solvent technology, which is applied in the field of liquid discharge devices, can solve the problems of beading (beading, insufficient ink absorption, transfer of the image part to the side of the joint paper, etc.), and achieves the effect of good image fixability and discharge stability.

Active Publication Date: 2018-02-09
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the above-mentioned water-based pigment ink is used to record on glossy paper for commercial printing or publishing and printing, there is a problem of insufficient ink absorption and beading.
[0004] Furthermore, after the printing process, the image recorded on the glossy paper for printing still has the problem that the image part is transferred to the side of the paper in the roll state of the winding process.

Method used

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  • Ink, ink container, Liquid Discharging Device, and Image Forming Method and apparatus thereof
  • Ink, ink container, Liquid Discharging Device, and Image Forming Method and apparatus thereof
  • Ink, ink container, Liquid Discharging Device, and Image Forming Method and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0532] -Preparation of Surface Modified Black Pigment Dispersion (1)-

[0533] BlackPearls (registered trademark) 1000 (having a BET specific surface area of ​​150m) manufactured by Cabot Corporation 2 / g and DBPA 105mL / 100g carbon black) 100g, sulfanilic acid 100mmol, and ion-exchange high-purity water 1L were mixed with a Silverson mixer (6000rpm) at room temperature.

[0534] When the pH value of the obtained slurry was higher than 4, 100 mmol of nitric acid was added to the slurry. Thirty minutes later, sodium nitrite (100 mmol) dissolved in a small amount of ion-exchanged high-purity water was gradually added to the above mixture. Furthermore, the product was heated to 60 degreeC with stirring, and it was made to react for 1 hour.

[0535] Subsequently, the pH of the resultant was adjusted to 9 with a 10% by mass tetrabutylammonium hydroxide solution (methanol solution), thereby obtaining a modified pigment dispersion containing at least one sulfanilic acid after 30 min...

preparation example 2

[0539] -Preparation of Surface Modified Black Pigment Dispersion (2)-

[0540] In the ProcessALL 4HV mixer (4L), BlackPearls (registered trademark) 880 (having a BET specific surface area of ​​220m 2 / g and DBPA 105mL / 100g of carbon black) 500g, to which 1L of ion-exchange high-purity water and 1mol of 4-aminobenzoic acid were added. Next, the resulting mixture was vigorously mixed at 300 rpm for 10 minutes and heated to 60 °C. A 20% by mass sodium nitrite aqueous solution [1 mol equivalent of 4-aminobenzoic acid] was added thereto over 15 minutes. The resulting mixture was mixed and stirred for 3 hours, and heated to 60°C. The above reactant was taken out while being diluted with 750 mL of ion-exchanged high-purity water.

[0541] Subsequently, the pH of the resultant was adjusted to 9 with a 10% by mass tetrabutylammonium hydroxide solution (methanol solution) to obtain a modified pigment dispersion containing at least one aminobenzene Formate- or tetraethylammonium-amin...

preparation example 3

[0545] -Preparation of Surface Modified Black Pigment Dispersion (3)-

[0546] In the ProcessALL 4HV mixer (4L), BlackPearls (registered trademark) 880 (having a BET specific surface area of ​​220m 2 / g and DBPA 105mL / 100g of carbon black) 500g, to which 1L of ion-exchanged high-purity water and 175mmol of 4-aminobenzoic acid were added. Next, the resulting mixture was vigorously mixed at 300 rpm for 10 minutes and heated to 60 °C. A 20% by mass sodium nitrite aqueous solution [175 mmol equivalent of 4-aminobenzoic acid] was added thereto over 15 minutes. The resulting mixture was mixed and stirred for 3 hours, and heated to 60°C. The above reactant was taken out while being diluted with 750 mL of ion-exchanged high-purity water.

[0547] Subsequently, the pH of the resultant was adjusted to 9 with a 10% by mass tetraethylammonium hydroxide solution to obtain a modified pigment dispersion comprising at least one aminobenzoic acid group after 30 minutes. or tetraethylammoni...

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Abstract

The invention relates to ink, an ink container, a liquid discharging device, and an image forming method and apparatus thereof. An ink includes a coloring material, one or more organic solvents, a resin particle including a structure unit having a carboxyl group and a structure unit having an alkoxysilyl group, and water. The one or more organic solvents includes at least one organic solvent having a solubility parameter of 8.96 to less than 11.8. The ink has a dynamic surface tension A of 34.0 mN / m or less for a surface life of 15 msec at 25 degrees C. according to maximum bubble pressure technique. The dynamic surface tension A and a static surface tension B of the ink at 25 degrees C. satisfy the following relation: 10.0 percent<=[(A-B) / (A+B)x100<=19.0 percent.

Description

technical field [0001] The present invention relates to ink, an ink container, an image forming method, an image forming device, an image formed object, and a liquid discharge device. Background technique [0002] In recent years, an image forming method by an inkjet method has been rapidly popularized because it can easily record a color image and has low operating costs. [0003] With regard to inks used in the above-mentioned image forming method, water-based pigment inks in which pigments are made into fine particles and dispersed in water are attracting attention. Compared with the color materials used in general commercial printing inks, the above-mentioned pigments have similar components, and it is expected that the touch of the printed matter will be close to that of commercial printing. However, if the above-mentioned water-based pigment ink is used to record on glossy paper for commercial printing or publishing and printing, there is a problem of insufficient ink...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/36C09D11/38C09D11/322B41M5/00
CPCB41M5/00C09D11/322C09D11/36C09D11/38C09D11/106B41J2/01C09D11/00C09D11/03C09D11/033C09D11/037C09D11/107C09D11/324
Inventor 后藤宽石川正彦
Owner RICOH KK