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Erasable liquid ink

An ink and liquid technology, applied in ink, printing, printing devices, etc., can solve problems such as clogged nozzle holes

Inactive Publication Date: 2012-07-04
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned decolorizable water-based ink is a pigment particle dispersion system (emulsion system) ink, and when it is applied to inkjet printing, there is a possibility that it will induce clogging of nozzle holes.

Method used

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  • Erasable liquid ink
  • Erasable liquid ink
  • Erasable liquid ink

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In a screw vial (20mL) with a magnetic stirring bar, add 50mg (0.12mmol) crystal violet lactone (Crystal Violet Lactone, hereinafter referred to as CVL) as a leucochrome, 546mg (2.7mmol) 2 , 4'-dihydroxydiphenylmethane (2,4'-dihydroxydiphenylmethane) as a developer, 3g of pure water, and 6g of propylene glycol monomethyl ether (propylene glycol monomethylether, hereinafter referred to as PGMME) as a water-soluble organic solvent, at room temperature Stir well for 1 hour. After filtering the resulting suspension, a colorless solution was obtained.

[0053] Then, inkjet printing was performed using this solution. As an inkjet printer, DeskJet112C (manufactured by Hewlett-Packard Co.) was used. No clogging occurred, and the inkjet discharge property was extremely stable.

[0054] The image density of the obtained image was calculated by the following method. The reflectance of the entire image was measured using a color difference meter (CR-300, manufactured by Konica ...

Embodiment 2

[0061] The same operation as in Example 1 was performed except that 500 mg (2.3 mmol) of 2,4-dihydroxybenzophenone (2,4-dihydroxybenzophenone) was used as a color developing agent. The resulting solution was light blue.

[0062] When inkjet printing was performed using this solution, clogging did not occur, and the inkjet discharge property was extremely stable. The resulting image density was high at 0.37 (including background density: 0.090).

[0063] In addition, as in Example 1, the color difference of the obtained afterimage with respect to the background color was calculated according to [Calculation Equation 3]. The resulting chromatic aberration was as small as 2.0, so that afterimages could not be visually recognized.

Embodiment 3～7

[0065] As the developer, 4-a-cumylphenol (4-a-cumylphenol), bisphenol (bisphenol) F, bisphenol (bisphenol) A, HDP-24, 3,5-dihydroxyacetophenone (3 , 5-dihydroxyacetophenone), carry out the same operation as in Example 1. The obtained liquid ink was as shown in Table 1, and both the color rendering property and the decolorization property were confirmed to have high values.

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PUM

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Abstract

A liquid ink giving an image which can be decolorized by heating or contacting thereof with a solvent. The liquid ink is characterized by comprising a leuco dye, a color developer, and a solvent, the color developer being general formula (1) or (2). The ink is further characterized in that the solvent comprises a water-soluble organic solvent and water.

Description

technical field [0001] The invention relates to a liquid ink whose image can be decolorized by heating or contacting with a solvent. Background technique [0002] An image forming material is proposed as an effective paper recycling technology, by adding a new decolorizer to a combination system containing a leuco pigment and a color developer, so that the color development state exists stably at a temperature around room temperature, And, by heat or solvent treatment, the decolorized state can be fixed for a long time at practical temperature. [0003] Such an image forming material has high stability in the color development and decolorization state of the image, and also has high material safety. It can be applied to electrophotographic toners, liquid inks, (ink) ribbons, and writing utensils, and has the advantage of being able to perform large-scale decolorization. [0004] Regarding the liquid ink, there is disclosed an erasable water-based ink having a small and uni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/00B41J2/01B41M5/00C09D11/328
CPCC09D11/38B41M2205/18C09D11/328
Inventor 关口裕实子佐野健二高山晓五反田武志
Owner KK TOSHIBA
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