JP2000326623A - Ink jet recording medium and method for recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording medium for accurately proof reading by a simple operation in a short time. SOLUTION: In the ink jet recording medium comprising an ink receptive layer provided on a support, the layer contains a coloring agent in such a manner that conditions that its surface has a lightness index L* according to JIS Z 8730 of 85 to 96, color coordinates a* of -1.0 to 2.0, b* of -3.0 to 2.0 (except a range that a* is 0±0.15 and b* is 0±0.15) are satisfied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording medium and an ink jet recording method which are excellent in ink absorbency and image reproducibility, and have the function as color proofing paper of general high quality paper and coated paper. About.

[0002]

2. Description of the Related Art The proofreading of color pages of a publication is performed by performing test printing, collating with a manuscript, correcting errors and improper points, and examining the color tone of the printed matter and the effect of color printing. It is to check that the required quality has been achieved. However, actually perform offset printing etc. for proofreading,
If printing is performed after adjusting the color tone after obtaining the information on the color misregistration of the image, it takes time and consumes a large amount of printing paper.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a method for performing accurate calibration with a simple operation in a short time. For this purpose, multi-color recording is performed in advance by a recording method that can easily perform multi-color recording,
It is conceivable to obtain information on color misregistration and calibrate printing based on this, but ordinary inkjet recording media for color recording, thermal transfer recording media, etc., to obtain high-quality color images, whiteness, The glossiness of the color image obtained by using these materials is slightly different from the color tone of a color image obtained by offset printing or the like on ordinary high-quality paper or printing paper, and correct calibration cannot be performed.

That is, even if calibration is performed using a commercially available ink jet recording medium and the color tone and printing effect of the printed matter are adjusted optimally, the offset printing is actually performed on ordinary high-quality paper or coated paper. The quality such as color tone and printing effect is different, and the intended color tone is not obtained. In addition, when general high-quality paper or coated paper is used as an ink jet recording medium, these papers have a small ink absorption capacity, and when a color image is recorded, ink overflows and color mixing occurs, so that a good color image cannot be recorded.

The inventors of the present invention have studied the solution of the above problem, and as a result, have found that by using an ink jet recording medium containing a colorant in the ink receiving layer and adjusting to a specific lightness index and color coordinates, It can be used as a calibration paper for color pages of general high-quality paper and coated paper.

Incidentally, an ink jet recording medium containing a colorant in the ink receiving layer is disclosed in, for example, JP-A-8-207422,
JP-A-10-235993 and JP-A-10-297080 describe the recording media described therein, in which the decorativeness is enhanced by coloring. In addition, JP-A-7-314880 also contains a colorant in the ink receiving layer, which is also colored to such an extent that coloring is easily recognized from the appearance,
Further, the colorant in the receiving layer is reacted with the dye in the ink for ink jet recording to obtain a recorded image with less bleeding. These ink jet recording media are colored to such an extent that it is easily recognized that they are colored, and if they are subjected to multicolor recording, the color tone will be remarkably shifted, so that they cannot be used for calibration at all.

[0007]

The present invention includes the following aspects. (1) In an ink jet recording medium provided with an ink receiving layer on a support, the ink receiving layer contains a colorant, and the surface thereof has a lightness index L * according to JIS Z8730 of 85 or more,
And the color coordinate a * is -1.0 or more, 2.0 or less,
b * is −3.0 or more and 2.0 or less (however, a * is 0 ± 0.1
5 excluding the region where b * is 0 ± 0.15). (2) The ink jet recording medium according to (1), wherein the colorant is at least one selected from a fluorescent dye, a cationic dye, a direct dye or a pigment dye. (3) An ink jet recording method using the ink jet recording medium according to (1) or (2) as a color tone calibration sheet for performing multicolor printing on printing paper which is a high quality paper or a pigment coated paper. An ink jet recording method in which an image to be subjected to color printing is previously recorded on the ink jet recording medium by an ink jet recording method, and information for correcting a color tone shift is obtained from the obtained recording.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The ink jet recording medium of the present invention has an ink receiving layer provided on a support, and the ink receiving layer contains a colorant. As the colorant, both a dye colorant and a pigment colorant can be used. As the colorant to be added, various types of dyes such as fluorescent dyes, cationic dyes, direct dyes, acid dyes, basic dyes, and reactive dyes can be used as dye-based colorants. Use direct dyes. There are various types of fluorescent dyes such as coumarin-based, triazole-based, benzoxazole-based, pyrazoline-based, naphthalimide-based, and still-based.

The cationic dye is generally water-soluble and forms a salt composed of a cationic portion of the dye itself having an onium group and a counter anion such as chloride and sulfate, and is water-soluble and is a methine dye, an azomethine dye, an azo dye or triphenyl. There are various types such as methane dyes and anthraquinone dyes. Direct dyes include polyazo dyes, diallyl urea derivatives, cyanuric chloride derivatives, stilbene derivatives, thiazole derivatives, and metal complex salts. Insoluble azo pigments, azo lake pigments,
There are various types such as phthalocyanine pigments, vat dye pigments, quinacridone pigments, and dioxazine pigments.

[0010] These colorants can be used alone or in combination of two or more. These colorants may be used in any ratio. The colorant is preferably selected from a fluorescent dye, a cationic dye, a direct dye or a pigment dye. These colorants are easy to dye and relatively resistant to sunlight (excellent lightfastness).

In the present invention, the lightness index L * and the color coordinates a * and b * are measured on the surface of the ink receiving layer by the method described in JIS Z8730. The surface of the ink receiving layer has a lightness index L * of 8 according to JIS Z8730.
5 or more and 96 or less, and the color coordinate a * is -1.0 or more,
Adjusted to satisfy the following conditions: 2.0 or less, b * is -3.0 or more and 2.0 or less (excluding the area where a * is 0 ± 0.15 and b * is 0 ± 0.15) I do. a * is 0 ± 0.15 and b * is 0 ±
The area of 0.15 is different from the color tone of high-quality paper used for printing or the printing paper provided with the pigment coating layer, and differs from the color tone obtained by normal printing such as offset printing. The color coordinates a * are -1.0 or more and 2.0 or less, and b * are -3.0 or more.
Outside the range of 0 or less, the coloring is too strong, and the color tone also shifts. In the above, preferably, the color coordinate b ^* is-
It is 2.5 or more and 2.0 or less (excluding a region where b * is 0 ± 0.15).

The ink receiving layer according to the present invention contains a pigment and an adhesive as main components. The pigment preferably contains a pigment that is porous, has high ink absorbency, and enables clear color development. Examples of such pigments include fine particle synthetic silica, zeolite, calcium carbonate, calcium silicate, aluminum hydroxide, calcined clay, kaolin, clay, talc, white carbon, organic pigments (plastic pigments), and generally used in paper coating. Examples of such pigments include, but it is particularly preferable to use fine-particle synthetic silica.

The proportion of the pigment used is not limited, but is 50 to 90% by weight of the solid content of the receiving layer. If it is less than 50%, the ink absorbency becomes insufficient, and if it exceeds 90%, the strength of the ink receiving layer may be reduced. Examples of the adhesive used in the ink receiving layer of the present invention include polyvinyl alcohol and polyvinyl alcohol derivatives such as cation-modified polyvinyl alcohol and silyl-modified polyvinyl alcohol, proteins such as polyvinylpyrrolidone and casein, starch and its derivatives, and styrene-butadiene copolymer. Conjugated diene-based polymer latex such as a copolymer, methyl methacrylate butadiene copolymer, an acrylic polymer latex such as a polymer or a copolymer of an acrylate ester and a methacrylate ester, an ethylene-vinyl acetate copolymer,
Aqueous adhesion of vinyl polymer latex such as ethylene-vinyl chloride copolymer or modified polymer latex containing functional groups such as carboxyl group and cationic group of these various polymers, synthetic resin such as melamine resin and urea resin Polymers such as adhesives, maleic anhydride copolymer resin type, polyacrylamide type, polymethyl methacrylate type, polyurethane resin type, unsaturated polyester resin type, polyvinyl butyral type, alkyd resin type etc. Alternatively, it is preferably used because it has good adhesiveness to the base material and good affinity with the aqueous ink, thereby improving the liquid absorbing property.

The proportion of the adhesive used in the ink receiving layer is about 10 to 50% by weight of the solid content of the receiving layer, preferably 10 to 40% by weight.
% By weight. If it is less than 10%, the adhesive strength becomes insufficient, and the strength of the receiving layer may be reduced. On the other hand, if it exceeds 50%, the adhesive strength increases, but the use ratio of the pigment decreases, and as described above, a problem may occur in the ink absorbency.

In order to improve the water resistance of a printed image with an aqueous ink, a polydiallyldimethylammonium resin, a polyethyleneimine resin, a polyamine resin,
Cationic polymer compounds such as polyamide resins, polyamide epichlorohydrin resins, polyamine epichlorohydrin resins, polyamide polyamine epichlorohydrin resins, polydiallylamine resins, and dicyandiamide condensates can be suitably used. As the support, paper such as acidic paper and neutral paper, synthetic paper, resin film, etc. can be used. For pulp, LBKP, NBKP
Chemical pulp, mechanical pulp, waste paper, etc. can be used.

Further, if necessary, a pigment dispersant, a thickener,
Antifoaming agents, foam inhibitors, foaming agents, mold release agents, penetrants, wetting agents, thermal gelling agents, lubricants, and various other auxiliaries known in the art can be used.

[0017]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. Further, (parts) and (%) shown in the examples represent parts by weight of solid content and weight% of solid content unless otherwise specified. However, the amount of the coloring agent added was shown in the state of a commercial product (for example, in the case of a solution, the number of parts by weight of the solution).

Example 1 The support had a basis weight of 72 g / m ² , L * 94.0, a * −0.67, b * 0.84, ISO
High quality paper with BR of 84.6 was used. The ink receiving layer was applied on the surface of the support. The coating composition of the ink receiving layer was composed of 30 parts of silanol-modified polyvinyl alcohol (R-1130, Kuraray Co., Ltd.), 100 parts of amorphous synthetic silica (Fine Seal X-30, Tokuyama), a cationic agent, polydiallyldimethyl. Ammonium chloride (Unisense CP-1
03, Senka Co., Ltd.) and 20 parts of fluorescent dye (Whitetex BPS-H,
0.10 parts, Sumitomo Chemical, cationic dye (Kayacel Red CB Li
quid, Nippon Kayaku) 0.10 parts, cationic dye (Kayacel Yellow
(CG Liquid, Nippon Kayaku) 0.15 parts, and these were adjusted to a solid content concentration of 15%. This coating solution was applied to a support by a bar coater so that the dry coating amount was 12 g / m ² . Further, the sheet was treated with a super calender to obtain an ink jet recording sheet.

Example 2 The dye composition of Example 1 was changed to a fluorescent dye (Whytex BPS-H,
0.10 parts, Sumitomo Chemical, cationic dye (Kayacel Red CB Li
Inkjet recording paper was prepared in the same manner as in Example 1, except that 0.10 parts of quid, Nippon Kayaku) and 0.05 parts of pigment dye (DC Blue XB, Dainichi Seika) were used.

Example 3 The dye composition of Example 1 was changed to a fluorescent dye (Whytex BPS-H,
(Sumitomo Chemical) 0.10 parts, pigment dye (DC Blue XB, Dainichi Seika) 0.0
An ink jet recording sheet was prepared in the same manner as in Example 1 except that the number of parts was changed to three. Example 4 The dye composition of Example 1 was changed to a fluorescent dye (Whytex BPS-H,
0.10 parts, Sumitomo Chemical, cationic dye (Kayacel Red CB L
iquid, Nippon Kayaku) 0.01 parts, cationic dye (KayacelYellow
(CG Liquid, Nippon Kayaku) An ink jet recording paper was prepared in the same manner as in Example 1 except that the amount was changed to 0.06 parts.

Example 5 The dye composition of Example 1 was replaced with a fluorescent dye (Whytex BPS-H,
Sumitomo Chemical) 0.10 part, pigment dye (TB910 Yellow FR, Dainichisei) 0.07 part, except that the pigment dye (TB520 Blue 2B, Dainichisei) 0.02 part, was changed to the inkjet recording paper in the same manner as in Example 1. Created. Example 6 The dye composition of Example 1 was changed to a fluorescent dye (Whytex BPS-H,
Sumitomo Chemical) 0.33 parts, pigment dye (TB910 Yellow FR, Dainichisei) 0.04 parts, except that the pigment dye (TB400 Red 2R, Dainichisei) 0.01 parts was changed, the inkjet recording paper in the same manner as in Example 1 Created.

Example 7 The dye composition of Example 1 was replaced with a fluorescent dye (Whytex BPS-H,
Sumitomo Chemical Co., Ltd.) 0.10 parts, pigment dye (TB910 Yellow FR, Dainichisei) 0.04 parts, pigment dye (TB400 Red 2R, Dainichisei) 0.02 parts Created.

Example 8 The support had a basis weight of 67 g / m ² , L * 88.7, a * -0.87, b * 3.50, ISO
BR used 70.2 medium quality paper. The dye composition of Example 1 was changed to a fluorescent dye (Whytex BPS-H,
Sumitomo Chemical) 0.10 parts, pigment dye (TB910 Yellow FR, Dainichisei) 0.04 part, pigment dye (TB400 Red 2R, Dainichisei) 0.02 parts, except that the inkjet recording paper was changed in the same manner as in Example 1. Created.

Example 9 The dye composition of Example 8 was replaced with a direct dye (Kayafect Red B Liq
uid, Nippon Kayaku) 0.15 parts, direct dye (Kayafect Blue FL)
iquid 400) An ink jet recording paper was prepared in the same manner as in Example 8, except that the amount was changed to 0.12 part.

Comparative Example 1 The dye composition of Example 1 was changed to a fluorescent dye (Whitetex BPS-H,
0.10 parts, Sumitomo Chemical, cationic dye (Kayacel Red CB Li
quid, Nippon Kayaku) 0.15 parts, cationic dye (Kayacel Yellow
(CG Liquid, Nippon Kayaku) Example 1 except for changing to 0.12 parts
In the same manner as above, an ink jet recording paper was prepared.

Comparative Example 2 The dye composition of Example 1 was changed to a fluorescent dye (Whytex BPS-H,
(Sumitomo Chemical) 0.10 parts, pigment dye (DC Blue XB, Dainichi Seika) 0.0
An ink jet recording paper was prepared in the same manner as in Example 1, except that 1 part was changed to 0.10 part of a cationic dye (Kayacel Yellow CG Liquid, Nippon Kayaku). Comparative Example 3 The dye composition of Example 1 was changed to a fluorescent dye (Whitetex BPS-H,
(Sumitomo Chemical) 0.10 parts, pigment dye (DC Blue XB, Dainichi Seika) 0.0
Ink jet recording paper was prepared in the same manner as in Example 1, except that the amount was changed to 7 parts and to 0.06 part of a cationic dye (Kayacel Red CB Liquid, Nippon Kayaku).

Comparative Example 4 The dye composition of Example 1 was replaced with a fluorescent dye (Whytex BPS-H,
Sumitomo Chemical) 0.10 parts, pigment dye (TB 520 Blue 2B, Dainichisei) 0.03 parts, pigment dye (TB910 Yellow FR, Dainichi Seisen) 0.10
Inkjet recording paper was prepared in the same manner as in Example 1 except that the number of parts was changed to parts. Comparative Example 5 The dye composition of Example 1 was changed to a fluorescent dye (Whitetex BPS-H,
(Sumitomo Chemical) 0.10 parts, pigment dye (DC Blue XB, Dainichi Seika) 0.0
An ink jet recording paper was prepared in the same manner as in Example 1, except that the amount was changed to 7 parts and to 0.01 part of a cationic dye (Kayacel Red CB Liquid, Nippon Kayaku).

Comparative Example 6 In the dye composition of Example 1, except that no dye was added.
In the same manner as in Example 1, an ink jet recording paper was prepared. Comparative Example 7 A commercially available Epson ink jet recording medium (Superfine paper) was used. Comparative Example 8 A commercially available inkjet recording medium (Premium IJ paper) manufactured by Hewlett-Packard Company (HP) was used.

Examples 1 to 9 and Comparative Examples 1 to 8 were evaluated by the following methods, and the results are shown in Table 1.

The evaluation as a color proof paper was made using an inkjet plotter (Design Jet 2500cp: Hewlett
High-definition color digital standard image data (ISO / JI) issued by the Japan Standards Association using UV ink (Hewlett-Packard pigment ink)
(S-SCID) image sample N1 (portrait) was printed, and color shift information was obtained using this image. Next, based on that information, offset printing was performed on commercially available lightly coated paper, visually observed, and the ink jet recording medium, which was an excellent proof paper, was adjusted to a color tone that was almost satisfactory5. 4, a slight color misregistration is recognized, but there is no practical problem 3,
A sample having a marked color shift was evaluated as 1.

The lightness index L * and the color coordinates a * and b * are JIS
It was measured by the method described in Z8730. The print density was printed using the above-described ink jet plotter and UV ink, and the optical density of the 100% black print portion was measured with a Macbeth densitometer (Macbeth, RD-914). ISO BR (whiteness) is ISO 3
The surface of the ink receiving layer was measured according to the method described in 688 (measured with a spectral whiteness colorimeter of Suga Test Machine). About 70 to 91 is preferable.

[0032]

[Table 1]

[0033]

According to the present invention, there is provided a method for performing accurate calibration by printing an ink jet system with a simple operation in a short time when printing high quality paper or coated paper. Further, the ink jet recording medium used therein was excellent in recording suitability.

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Claims (3)

[Claims] 1. In an ink jet recording medium having an ink receiving layer provided on a support, said ink receiving layer contains a colorant, and the surface thereof has a lightness index L * according to JIS Z8730 of 85 or more and 96 or less, and 1. color coordinate a * is -1.0 or more;
0 or less, b * is −3.0 or more and 2.0 or less (provided that a * is 0 ±
0.15 excluding the region where b * is 0 ± 0.15). 2. The ink jet recording medium according to claim 1, wherein the colorant is at least one selected from a fluorescent dye, a cationic dye, a direct dye or a pigment dye. 3. An ink-jet recording method using the ink-jet recording medium according to claim 1 or 2 as color tone calibration paper for performing multi-color printing on printing paper which is high quality paper or pigment coated paper. An ink jet recording method in which an image to be subjected to color printing is recorded in advance on the ink jet recording medium by an ink jet recording method, and information for correcting a color shift is obtained from the obtained recording.