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Inkjet ink and printing method using the same

a technology of inkjet ink and printing method, which is applied in the field of inkjet ink, can solve the problems of inability to print with clear edges, inkjet ink is repelled by or bleeds on the coating surface, and the offset coated media that is suitable for offset printing is not suited for printing using aqueous inkjet ink, so as to improve the drying property, increase the permeability into the coating, and improve the drying

Inactive Publication Date: 2010-05-06
GENERAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention relates to an inkjet ink for printing on hydrophobic media, such as offset coated media. The invention includes a pigment, water, a surfactant, and a polar aprotic solvent having a molecular weight of (40 to 130). The polar aprotic solvent helps to improve the printing performance of the ink on the surface of the media by preventing bleeding and repulsion of the ink. The invention also provides a method for printing on hydrophobic media using the inkjet ink. The technical effects of the invention include improved printing performance and better quality prints on hydrophobic media."

Problems solved by technology

However, offset coated media that are suitable for offset printing are not suited for printing using an aqueous inkjet ink, because a substrate surface is coated with a smooth, hydrophobic, and non-porous coating.
Even if printing using an aqueous inkjet ink is performed, because the coating does not absorb the aqueous inkjet ink, the inkjet ink is repelled by or bleeds on the coating surface and a clear print with sharp edges cannot be obtained.
Further, because the print is poor in drying property and inadequate in fixing property even upon drying, bleeding occurs readily when the print is rubbed.

Method used

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  • Inkjet ink and printing method using the same
  • Inkjet ink and printing method using the same
  • Inkjet ink and printing method using the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Manufacture of the Inkjet Ink

[0099]A carbon black dispersion [Cabojet 300, manufactured by Cabot Corporation, carboxylic group modified, aqueous dispersion, 15 weight % of solids] was used as the pigment, and 1,3-dimethyl-2-imidazolidinone [molecular weight: 114.2, boiling point: 225.5° C.] was used as the polar aprotic solvent. A silicone-based surfactant [Olfine PD-501, manufactured by Nissin Chemical Industry Co., Ltd., dynamic contact angle at 23° C.: 16.1°] was used as the surfactant, and an ethylene oxide adduct of sodium citrate with which the p in the Formula (4) is 6 and all of M1 to M3 are sodium was used as the ethylene oxide adduct of organic acid.

[0100]As the binder resin, an alkali-soluble acrylic resin [NeoCryl B-817, manufactured by Avecia Limited, weight average molecular weight Mw: 23,000] was used, and as the basic substance for dissolving the binder resin in the inkjet ink, 2-amino-2-methyl-1-propanol was used. As the polyoxyethylene phenyl ether, the compound ex...

examples 2 to 8

[0102]In place of 1,3-dimethyl-2-imidazolidinone, except using the same amounts of N-methyl-2-pyrrolidone [molecular weight: 99.1, boiling point: 202° C.] (Example 2), 2-pyrrolidone [molecular weight: 85.1, boiling point: 245° C.] (Example 3), formamide [molecular weight: 45.0, boiling point: 210° C.] (Example 4), N-methylformamide [molecular weight: 59.1, boiling point: 197° C.] (Example 5), N,N-dimethylformamide [molecular weight: 73.1, boiling point: 153° C.] (Example 6), N,N-diethylpropionamide [molecular weight: 129.2, boiling point: 195° C.] (Example 7), and γ-butyrolactone [molecular weight: 86.1, boiling point: 204° C.] (Example 8) as the polar aprotic solvents, inkjet inks were manufactured in the same manner as in Example 1.

example 9

[0103]Except setting the amount of the 1,3-dimethyl-2-imidazolidinone as the polar aprotic solvent to 40 parts by weight, the amount of the silicone-based surfactant to 0.7 parts by weight, the ratio P / S of the two components to 57 / 1, and the amount of the ion-exchanged water to 38.4 parts by weight, an inkjet ink was manufactured in the same manner as in Example 1.

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Abstract

A inkjet ink and a method for printing on hydrophobic media such as offset coated media using the inkjet ink. An inkjet contains a pigment, water, a surfactant and 40 to 75 weight % of a polar non-protic solvent with a molecular weight of 40 to 130 which has permeability to a hydrophobic surface such as the coating of an offset coated medium.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a first division of copending application Ser. No. 11 / 631,346, filed Jul. 17, 2007, which is a U.S. national stage application of PCT application serial number PCT / JP2005 / 021206, filed Jun. 30, 2005.TECHNICAL FIELD[0002]The present invention relates in particular to an inkjet ink suitable for printing on hydrophobic media, such as offset coated media, and a method for printing on hydrophobic media using the inkjet ink.BACKGROUND ART[0003]Generally with a conventional inkjet printing method using an aqueous inkjet ink, printing is performed on a bond paper or other normal type of paper or on a specialized paper, typically designed to have a high ink absorbing property, etc. However, offset coated media that are suitable for offset printing are not suited for printing using an aqueous inkjet ink, because a substrate surface is coated with a smooth, hydrophobic, and non-porous coating.[0004]Even if printing using an aqueou...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B41J29/38C09D11/02C09D11/30B41J2/01B41M5/00C09D11/00C09D11/322C09D11/326C09D11/38
CPCC09D11/30C09D11/38B41J2/01B41M5/00
Inventor ISOBE, KOZO
Owner GENERAL CO LTD
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