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Image forming process and image forming apparatus and ink set therefor

An imaging method, technology of composition, applied in the direction of ink, copy/marking method, printing, etc., can solve the problems of high color development, blurred characters, increased viscosity, etc.

Inactive Publication Date: 2006-06-21
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem with the image recording method is that, by combining with the recording medium, blurring of characters (hereinafter referred to as fuzzing) occurs, thus deteriorating the image quality
However, the disadvantage of this method is that the colorant enters the recording medium, which causes a decrease in image density, or a large amount of recording composition passes through the back of the recording medium, which seriously affects duplex printing (printing on both sides of the sheet)
[0018] However, cationic polymers or oligomers mentioned as cationic compounds, when added to treatment compositions, cause impairment of storage stability and increased viscosity of the treatment composition
Compared with cationic polymers and oligomers, cationic surfactants lack the ability to fix colorants and thus show low and insufficient improvement effects for high color development, bleeding inhibition and water resistance of printed matter

Method used

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  • Image forming process and image forming apparatus and ink set therefor
  • Image forming process and image forming apparatus and ink set therefor
  • Image forming process and image forming apparatus and ink set therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0276] First, in order to measure the isoelectric point at different pHs and the particle size of simple substance particles, particle dispersions 1 to 14 having various pH values ​​set were prepared by the following composition.

[0277]

[0278] Cationic Colloidal Silica

[0279] (SNOW TEX AK; Nissan Chemical Industries, Ltd.) 1.4 parts

[0280] water balance

[0281]

[0282] Cationic Colloidal Silica

[0283] (SNOW TEX AK; Nissan Chemical Industries, Ltd.) 1.4 parts

[0284] LiOH 0.05 parts

[0285] water balance

[0286]

[0287] Cationic Colloidal Silica

[0288] (SNOW TEX AK; Nissan Chemical Industries, Ltd.) 1.4 parts

[0289] LiOH 0.08 parts

[0290] water balance

[0291]

[0292] Cationic Colloidal Silica

[0293] (SNOW TEX AK; Nissan Chemical Industries, Ltd.) 1.4 parts

[0294] 0.15 parts of LiOH

[0295] water balance

[0296]

[0297] Cationic Colloidal Silica

[0298] (SNOW TEX AK; Nissan Chemical Industries, Ltd.) 1.4 parts

[0299] 0.3...

Embodiment 2

[0350] In order to examine the relationship between the change in pH and the change in viscosity of the turbidity formed by mixing the treatment composition of the ink set of the present invention and the recording composition, treatment compositions a to f and treatment compositions A to J were prepared from the following formulations .

[0351] In addition, the fine particles having an isoelectric point are the same as those used in Example 1 for components active to the colorant contained in the treatment composition.

[0352]

[0353] Cationic colloidal silica (SNOW TEX AK; Nissan Chemical Industries, Ltd.) 14.0 parts

[0354] Glycerin 10.0 parts

[0355] Octanediol 1.0 parts

[0356] cationic surfactant

[0357] (Cation G 50; Sanyo Chemical Industries, Ltd.) 2.0 parts

[0358] Benzotriazole 1.0 parts

[0359] PROXEL LV(s) (Avecia Ltd.) 0.2 parts

[0360] 5.7 parts of acetic acid

[0361] water balance

[0362]

[0363] Cationic colloidal silica (SNOW TEX AK; N...

Embodiment 3

[0517] Embodiment 3 (experiments 1 to 6)

[0518] The treatment compositions a, d and f and the recording compositions A, E, H and J prepared in Example 2 were formulated as described in Table 2 below, whereby an ink set was prepared. Each ink set was put into an ink cartridge and loaded on an IpsioJet300: (Ricoh Co., Ltd.) printer. Printing was performed and the resulting prints were evaluated. Simultaneously, another printing was performed at a constant ratio and total amount of the treatment composition adsorption amount (Mj1) and the recording composition adsorption amount (Mj1). The components active on the colorants contained in the treatment compositions are the same and the colorants contained in the recording compositions are the same, but with different pH, as described in the formulations of the corresponding treatment compositions and the corresponding recording compositions. Therefore, the pH (γ) of the mixtures differed except for some cases described in Table ...

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Abstract

Disclosed are an ink set including a recording composition and a processing composition capable of producing high-quality images without fuzzing or bleeding on plain paper, an image forming method and an image forming apparatus using the same, and printed matter. The image can be formed by applying a recording composition containing a colorant and a treatment composition containing a component active to the colorant such that they are contacted and mixed on the recording medium, and adjusting the pH of the mixture. In imaging, this component has an isoelectric point where the zeta potential according to the pH change of the mixture is zero, and the recording composition is adjusted such that the change in the more acidic side from pH (c) depends on the pH change of the mixture When ζ is -2.5mV·l / mol, pH(c) satisfies a<γ and a<c.

Description

technical field [0001] The present invention relates to printing techniques in inkjet printers, and more particularly to an ink set including a recording composition and a treatment liquid composition for high image quality suppressing feathering and bleeding, an image forming method using the ink set and Imaging devices, and printed matter. Background technique [0002] The inkjet recording method of recording an image using droplets of a recording composition containing a colorant is advantageous in that its printing mechanism is simple and noiseless. [0003] The image recording method has a problem in that, by combining with a recording medium, blurring of characters (hereinafter referred to as fuzzing) occurs, thus impairing image quality. To solve this problem, attempts have been made to reduce fuzzing by suppressing the ink (recording composition). However, this method has a drawback in that when the printed matter is touched with hands after printing, hands are sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/00B41J2/01C09D11/30C09D11/32
Inventor 古川寿一安达浩
Owner RICOH KK
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