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Inkjet ink set, and method for forming image using same

a technology of inkjet ink and image, which is applied in the direction of inks, coatings, applications, etc., can solve the problems of poor image quality of image forming methods using conventional ultraviolet-curable inkjet systems, and achieve high image quality and gloss. , the effect of high gloss

Active Publication Date: 2015-05-07
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]The color ink in the inkjet ink set according to one aspect of the present invention rarely causes combining of ink droplets after it is landed on a recording medium. Therefore, a high-resolution image can be formed. On the other hand, the clear ink in the inkjet ink set according to one aspect of the present invention can be easily levelled. Therefore, a highly glossy film can be formed. Specifically, the inkjet ink set according to one aspect of the present invention can form a printed image having both high image quality and glossiness.

Problems solved by technology

However, the image forming methods using the conventional UV-curable inkjet systems have the drawback of poor image quality due to failure to prevent combining of neighboring dots during high-speed recording such as single pass recoding using a line recording head or high speed serial recording.

Method used

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  • Inkjet ink set, and method for forming image using same
  • Inkjet ink set, and method for forming image using same
  • Inkjet ink set, and method for forming image using same

Examples

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examples

[0197]Hereinafter, the present invention will be described in more detailed with reference to Examples, but it is not understood that the scope of the present invention is limited to Examples.

[0198][Radical Polymerizable Inkjet Ink Set (Single Color)]

[0199]A radical polymerizable cyan ink and clear ink were prepared using the following components.

[0200]Gelling Agent

[0201]LUNAC BA (manufactured by Kao Corporation)

[0202]FATTY AMID T (manufactured by Kao Corporation)

[0203]Stearic acid amide

[0204]Kao wax T1 (manufactured by Kao Corporation)

[0205]Photocurable Compound (Monomer)

[0206]NK ester A-400 (polyethylene glycol #400 diacrylate, manufactured by Shin-Nakamura Chemical Co., Ltd.)

[0207]SR494 (4EO modified pentaerythritol tetraacrylate, manufactured by Sartomer Company)

[0208]SR499 (6EO modified trimethylolpropane triacylate, manufactured by Sartomer Company)

[0209]Photocurable Compound (Oligomer)

[0210]Bifunctional methane acrylate oligomer (average molecular weight: 1,400)

[0211]Photopol...

examples 1 to 10

[0279]In contrast to this, in the case where no clear ink was applied (Comparative Example 1), the letter quality was satisfactory but the glossiness and the relief feeling were poorly graded. Furthermore, the rub resistance was also low. This is presumably because fine irregularities, level differences, or the like occurred in the surface of the printed image.

[0280]In the case of the image formation conditions of Comparative Examples 6 and 7 where the viscosity of the clear ink was the same as or higher than that of the color ink, the letter quality was satisfactory but the glossiness or the relief feeling was poorly graded. Under these image formation conditions, the droplets of the color ink quickly underwent sol-gel phase transition after the droplets were landed on the recording medium and thus combining of color ink droplets was successfully prevented. On the other hand, presumably, leveling was insufficiently attained due to the high viscosity of the clear ink landed on the r...

examples 13 and 14

[0318]Images were formed in the same manner as that described in Example 1 except that yellow ink Y1, magenta ink M1, cyan ink Cy2, and black ink Bk1 were used as color inks and clear ink CL2 was used as a clear ink. Evaluation was performed in the same manner as that for the radical curable inkjet ink sets (single color). The results are shown in Table 8.

TABLE 8Image formationRecordingEvaluationColor inkClear inkOrder inLightRecordingmediumLetterReliefRubInkViscosityInkViscosityprintingexposuremediumtemperaturequalityGlossinessfeelingresistanceExample 13Y17.4 × 103CL22.1 × 103Color→CLAt onceOK TOP 45° C.AAAAM14.5 × 103COAT+Cy27.2 × 103Bk16.8 × 103Example 14Y17.4 × 103CL22.1 × 103Color→CLAt onceSA 45° C.AAAAM14.5 × 103KINFUJI+Cy27.2 × 103Bk16.8 × 103

[0319]As seen from Table 8 above, the ink set in which the viscosity of the clear ink was less than ½ of that of all the color inks was able to form an image with satisfactory letter quality, regardless of the type of the recording mediu...

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Abstract

An inkjet ink set comprising: a color ink including a photocurable compound, a photopolymerization initiator, a gelling agent, and a colorant, the color ink undergoing a sol-gel phase transition depending on the temperature; and a clear ink including a photocurable compound, a photopolymerization initiator, and a gelling agent, the clear ink undergoing a sol-gel phase transition depending on the temperature. The viscosity (η) (CL) of the clear ink at 25° C. is less than ½ the viscosity (η) (CO) of the color ink at 25° C., and the viscosity (η) (CL) of the clear ink is 1×103 mPa·s or greater. Provided is an inkjet ink set by which a printed image offering both high image quality and surface gloss can be formed.

Description

TECHNICAL FIELD[0001]The present invention relates to an inkjet ink set and an image forming method using the same.BACKGROUND ART[0002]From the viewpoint of simple and inexpensive image production, inkjet recording has been used in a variety of printing fields. As the inkjet recording method, there is an UV-curable inkjet method wherein droplets of inkjet ink are landed on a recording medium and then cured by irradiation with ultraviolet rays to form an image. Recently, the UV-curable inkjet method has been attracting attention for its capability of forming images having high rubfastness and adhesiveness even on recording media which lack ink absorbing properties.[0003]However, the image forming methods using the conventional UV-curable inkjet systems have the drawback of poor image quality due to failure to prevent combining of neighboring dots during high-speed recording such as single pass recoding using a line recording head or high speed serial recording. As one of methods for ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D11/40C09D163/00C09D133/14
CPCC09D11/40C09D163/00C09D133/14B41J2/2114B41M7/0081C09D11/101C09D11/322C09D11/34C09D11/38C09D11/54
Inventor IIJIMA, HIROTAKAMAEDA, AKIO
Owner KONICA MINOLTA INC
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