JPH11246810A - Ink for forming receiving layer and product using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject ink capable of imparting the receptivity for an ink jet ink and luminous effects, making the position known in the dark, definitely discriminating prints and aiming at a substrate for a compact disk, etc., by including a luminous pigment as a receptivity improver therein. SOLUTION: This ink is obtained by including a luminous pigment having preferably 5-35 μm, more preferably 8-25 μm average particle diameter such as an N selfluminous luminous pigment as a receptivity improver in an amount of preferably about 15-90 pts.wt. based on 100 pts.wt. of an ink vehicle. A hydrophilic polymer as a binder is preferably contained in the ink. The luminous pigment and a conventionally known water adsorbing or a water absorbing organic filler can be used in combination as the receptivity improver.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an ink for forming a receiving layer and a product using the same.

[0002]

2. Description of the Related Art Conventionally, when ink-jet printing is performed on a base material such as paper, film, board, etc., it has been practiced to print or coat a receiving layer on the base material in order to speed up ink absorption and reduce bleeding. Have been done. As the ink for forming a receiving layer, an ink obtained by dissolving a water-soluble polymer in an aqueous medium and further adding silica, alumina, aluminum hydroxide or the like as a filler is used.

As another alternative, there has been proposed an ink in which a water-adsorptive organic filler is added to a liquid water-soluble monomer and the filler is cured.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an ink for forming a receiving layer containing a novel receptivity improving agent. Moreover, it contains not only a simple acceptability improver such as conventional silica, alumina, aluminum hydroxide, and water-adsorbing organic substances, but also a novel acceptability enhancer having another function and performance of improving acceptability. An object of the present invention is to provide an ink for forming a receiving layer together with a product using the ink for forming a receiving layer. That is, the present invention provides an ink for forming a receiving layer containing a receptivity improver that simultaneously imparts luminous properties in addition to the ink jet ink receptivity, and a product using the same.

[0005]

According to the present invention, there is provided an ink for forming a receiving layer which forms a receiving layer of an ink-jet ink, comprising a phosphorescent pigment as a receptivity improver. . Further, the present invention provides an ink-jet ink receptive product obtained by printing or coating an ink for forming a receiving layer containing a luminous pigment as a receptivity improver on a substrate, and performing printing with the ink-jet ink on the receptive product. Provide printing products.

In the ink for forming a receiving layer of the present invention, as the phosphorescent pigment to be added as a receptivity improver, any phosphorescent pigment which is generally provided on the market, such as N phosphorescent phosphorescent pigment or S phosphorescent phosphorescent pigment, can be used.

The particle size of the luminous pigment is generally 0.5 to 50 μm.
m, preferably those having an average particle size of 5 to 35 μm, more preferably 8 to 25 μm. If the average particle size is too small, the effect of improving the receptivity of the inkjet ink tends to be small, and the luminous property tends to be small. On the other hand, if the average particle size is too large, the ink jet printed image will be coarse and the printed image quality will be reduced.

In the ink for forming a receiving layer of the present invention, the amount of the luminous pigment used is generally about 5 to 120 parts by weight based on 100 parts by weight of the ink vehicle.
It is preferably about 15 to 90 parts by weight.

Further, in the ink for forming a receiving layer of the present invention, a phosphorescent pigment and a conventionally known receptivity improving agent, that is, a water-absorbing organic substance, silica, alumina, aluminum hydroxide, etc. are used in combination as a receptivity improving agent. You can also. A combination of the luminous pigment and a water-adsorbing organic substance, such as protein powder, cellulose powder, and water-absorbing polymer powder, gives particularly favorable results.

The binder used in the ink for forming a receiving layer of the present invention is preferably a hydrophilic polymer. As the hydrophilic polymer, a water-soluble polymer can also be used, but a polymer having a hydrophilic group that makes it difficult to repel water even if it is insoluble in water can be used preferably. In a curable ink such as an ultraviolet curable ink, a water-soluble monomer can be used as a suitable binder, or one obtained by dissolving various oligomers or polymers in a water-soluble monomer can be used as a suitable binder.

Further, various additives used in general inks can be added as additives.

By printing or coating the ink for forming a receiving layer of the present invention on various substrates, an ink-jet ink receptive product can be obtained. As a printing or coating method in this case, any method such as screen printing, gravure printing, flexographic printing, letterpress printing, spray coating, and roll coating can be used. In the case of solvent-based ink, printing involves solvent drying, and in the case of ultraviolet-curable ink, etc., irradiation with ultraviolet light or the like is involved.

The thickness of the printed receiving layer is generally from 1 to 10
0 μm, preferably about 5 to 50 μm. Therefore, as a printing method for obtaining a receiving layer having a preferable thickness, a printing method such as screen printing can be suitably used.

As the substrate of the receptive product of the present invention, a substrate made of a synthetic resin is preferably used. Examples of synthetic resins include polycarbonate, polyvinyl chloride, polyester, polyolefin, ABS resin, acrylic resin,
There is a curable resin. In general, these resins are extremely poor in ink-jet ink receptivity, but by printing with the ink for forming a receiving layer of the present invention, a receptive product having both excellent ink-jet ink receptivity and luminous property is obtained. Obtainable.

If the synthetic resin base material used here is an information recording medium such as a compact disk, a particularly high value-added product can be obtained. In other words, the information recording medium such as the compact disk of the present invention has the ink jet ink which is non-plate-making printing in addition to the indication of the use and characteristics of the compact disk, in addition to the indication of the characteristics and the like of the compact disk in order to have both the ink receiving property and the luminous ability. This has the advantage that it can be recorded by printing and can be determined even in dark places.

[0016]

The characteristics of the receptive product of the present invention and the product of the comparative example were compared. Ink for forming a receiving layer of the present invention (Example 1) N luminous phosphorescent pigment (average particle diameter 15 μm): 15.0 parts by weight Water-adsorbable organic filler: 15.0 parts by weight Photoreactive acrylic oligomer: 20.0 parts by weight Part Photoreactive monomer: 43.0 parts by weight Photoinitiator: 5.0 parts by weight Auxiliary agent: 2.0 parts by weight Ink for forming receiving layer of the present invention (Example 2) N luminous phosphorescent pigment (average particle diameter 15 μm) ): 30.0 parts by weight Photoreactive acrylic oligomer: 20.0 parts by weight Photoreactive monomer: 43.0 parts by weight Photoinitiator: 5.0 parts by weight Auxiliary agent: 2.0 parts by weight Ink of comparative example ( Comparative Example) Photoreactive acrylic oligomer: 45.0 parts by weight Photoreactive monomer: 48.0 parts by weight Photoinitiator: 5.0 parts by weight Auxiliary agent: 2.0 parts by weight Examples 1 and 2 and Comparative Examples Ink on CD-R substrate
Screen printing was carried out with a 00 mesh and cured by ultraviolet rays to produce a product having a coating thickness of 15 μm. Next, printing was performed on the product of each of the examples and the product of the comparative example by an inkjet printer A (manufactured by Canon Inc.) and an inkjet printer B (manufactured by Epson Inc.). The printability of each of the examples and the comparative examples was observed, and at the same time, the appearance in a room where the night illumination was turned off was observed. As a result, the results shown in Table 1 below were obtained. The evaluations in Table 1 are as follows: ：: very good, ：: good, ×: bad.

[0017]

[Table 1] As can be seen from Table 1, in Example 1, the printability was very good, and the appearance in the room where the night illumination was turned off could be recognized by the location and the print could be discriminated. Further, in Example 2, the printability was good, and the appearance in a room where the night illumination was turned off was clear, and the print was clearly discriminated. However, in the comparative example, not only was the location unknown in the room where the night illumination was turned off and the printability could not be determined, but also the printability was poor.

[0018]

According to the present invention, it is possible to provide a light storage effect simultaneously with the acceptability of an ink-jet ink. It is also possible to improve the acceptability of the ink.

Claims (8)

[Claims] 1. An ink for forming a receiving layer, which forms a receiving layer of an ink-jet ink, comprising a luminous pigment as a receptivity improver. 2. The phosphorescent pigment has an average particle size of 5 to 35 μm.
The ink for forming a receiving layer according to claim 1, wherein 3. The ink for forming a receiving layer according to claim 1, further comprising a phosphorescent pigment and a water-absorbing or water-absorbing organic filler in combination as a receptivity improver. 4. The ink for forming a receiving layer according to claim 1, wherein the binder comprises a hydrophilic polymer. 5. An ink-jet ink receptive product obtained by printing or coating the ink for forming a receiving layer according to claim 1 on a substrate. 6. The ink-jet ink receptive product according to claim 5, wherein the substrate is a substrate made of a synthetic resin. 7. The ink-jet ink receptive product according to claim 6, wherein the synthetic resin substrate is an information recording medium such as a compact disk. 8. A printed product obtained by printing an ink-jet ink on the receptive product according to claim 5, 6, or 7.