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Water-based ink for ink-jet printing

An inkjet recording, water-insoluble technology, applied in the field of water dispersions for inkjet recording, can solve problems such as adverse effects on printed image quality

Inactive Publication Date: 2007-09-12
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, with each of these inks there are concerns about adverse effects on printed image quality due to additives or changes in pigments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0161] Production Example 1 Production of water-insoluble polymer

[0162] To 120 parts (solid content: 100 parts) of a monomer mixture consisting of the following substances, add and mix 20 parts of an organic solvent (methyl ethyl ketone), 1 part of a polymer chain transfer agent (2-mercaptoethanol, Wako Pure Chemical Industries, Ltd. 10% of a mixture of a polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile), manufactured by Wako Pure Chemical Industries, Ltd., V-65) %, and carry out sufficient nitrogen replacement to obtain a mixed solution. Among them, the substances forming the above-mentioned monomer mixture are: 46 parts of benzyl methacrylate (manufactured by Wako Pure Chemical Industries, Ltd., reagent), 14 parts of methacrylic acid (manufactured by Wako Pure Chemical Industries, Ltd., reagent), 40 parts (20 parts of solid content) styrene macromonomer (manufactured by Toagosei Co., Ltd., trade name: AS-6S, number average molecular weight: 6000, 50% (soli...

Embodiment 1

[0165] 25 parts of the polymer obtained by drying the polymer solution obtained in Production Example 1 under reduced pressure were dissolved in 70 parts of methyl ethyl ketone, and then mixed with 83 parts of 30% silica sol (hydrophobic-treated silica; manufactured by Nissan Chemical Industries, Ltd., The trade name is MEK-ST) mixed, and 4.1 parts of neutralizing agent (5N sodium hydroxide aqueous solution) (neutralization degree is 75%) and 230 parts of ion-exchanged water are added to it to neutralize and form a salt base, and 50 parts of copper are further added Phthalocyanine pigments (pigment blue 15:3, with an average primary particle size of 70nm) were pre-dispersed in a disperser (デイスパー), and filled with zirconia beads (particle size: 50 μm) from Asada Iron Works Co., Ltd. The ratio is 80% (dispersion medium 80 / dispersion liquid 20), the temperature is 10°C), and the dispersion treatment is carried out for 1 hour at the rotation speed of the tip of the stirring blade a...

Embodiment 2

[0169] 25 parts of the polymer obtained by drying the polymer solution obtained in Production Example 1 under reduced pressure were dissolved in 70 parts of methyl ethyl ketone, and then mixed with 37.5 parts of 40% silica sol (hydrophobic-treated silica; the average particle diameter was 10 to 20 nm) (trade specification value), manufactured by Nissan Chemical Industry Co., Ltd., trade name TOL-ST) mixed, and 4.1 parts of neutralizing agent (5N sodium hydroxide aqueous solution) (neutralization degree is 75%) and 230 parts of ion exchange The water was neutralized to form a salt base, and 60 parts of copper phthalocyanine pigments (pigment blue 15:3, with an average primary particle size of 70nm) were added, and the dispersion treatment was carried out according to the same steps as in Example 1. The obtained mixture was subjected to dispersion treatment 10 times under a pressure of 200 MPa using MICROFLUIDIZER" (manufactured by Microfluidics, trade name).

[0170] Add 250 pa...

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Abstract

A water dispersion for inkjet printing which includes water-insoluble polymer particles. The water-insoluhle polymer particles contain silica particles and a pigment other than the silica particles. Awater-based ink containing the water dispersion is excellent in the storage stability and effectively reduces the bronze phenomenon of printed images.

Description

technical field [0001] The present invention relates to an aqueous dispersion for inkjet recording capable of reducing bronzing of printed matter, an aqueous ink, and a method for producing the same. Background technique [0002] The inkjet recording method is a recording method in which ink droplets are directly sprayed from very fine nozzles onto a recording member, and adhered to obtain characters or images. This method is very popular because it has many advantages such as easy full-color printing, low cost, ordinary paper can be used as a recording member, and non-contact with the printed matter. [0003] Among them, from the viewpoint of weather resistance and water resistance of printed matter, the use of pigment-based inks is becoming the mainstream, but when using pigments as colorants, depending on the viewing angle of printed matter, there may be a phenomenon of gold rubbing. It is observed that the reflected light shows a color different from the original color ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/10B41J2/01B41M5/00B82Y30/00C09D11/00C09D11/322C09D17/00
CPCC09D11/30C09D11/322
Inventor 平石笃司堤武弘
Owner KAO CORP