JP3555794B2 - Material for fluorescent printing, method for producing fluorescent printed matter, and fluorescent printed matter - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluorescent printing material, a method for producing a fluorescent printed matter, and a fluorescent printed matter. More specifically, when an ink containing a fluorescent dye or the like is used, for example, when a fluorescent bar code or the like is printed, a fluorescent printing material capable of providing high and stable fluorescent light emission, and a light emission intensity The present invention relates to a fluorescent printed matter that emits high and stable fluorescent light and a method for manufacturing the same.
[0002]
[Prior art]
The fluorescent printed matter has a fluorescent printed layer that emits light by being irradiated with light of a specific wavelength such as ultraviolet light to be readable.
For example, when the fluorescent printing layer is a barcode, barcode information can be read and confirmed as needed. Invisible (invisible) barcodes, which are one of such fluorescent printing layers, are considered to be effective as, for example, counterfeiting prevention means for securities printed matter, traffic coupons, commuter passes, and the like.
An invisible printing layer such as an invisible barcode is also useful as a means for recording necessary information without impairing the appearance of a certain printing layer. For example, by providing an invisible printing layer on the surface of a CD-ROM or LD, it is possible to provide information for retrieval without impairing the appearance.
[0003]
[Problems to be solved by the invention]
By the way, in a fluorescent printed matter, in order to read information without error, it is necessary to stably obtain a fluorescence emission intensity of a certain intensity or more. However, when a fluorescent print layer is formed on a substrate having a print layer of characters, patterns, etc., the luminous intensity varies depending on the color and color material of the background print layer, and a readable luminous intensity can be obtained in some places. There was no problem.
It has been proposed to provide an ultraviolet absorbing layer as a back coat layer directly below the fluorescent printing layer for the purpose of maintaining the intensity of the fluorescent emission from the fluorescent printing at a certain level or higher [WO92 / 20748]. When there is a color having a high absorptivity, such as black, on the base, the amount of ultraviolet light that reflects from the base and hits the fluorescent ink (dye) decreases, while the fluorescent light emitted from the fluorescent ink is emitted toward the base and reflected. The amount of fluorescent light that comes back is also reduced. By providing the ultraviolet absorbing layer, such a problem is solved to some extent.
[0004]
However, according to the study of the present inventors, even when an ultraviolet absorbing layer is provided as a back coat layer, fluorescence having a sufficient luminous intensity may not be obtained depending on the color and coloring material of the ink in the printing layer. Was.
In order to investigate the cause, printing (black letters, magic letters, etc.) was performed on the base material using a black ink, an ultraviolet absorbing layer was provided thereon, and a fluorescent printing layer was further formed thereon. Then, when the state of the black ink and the fluorescent ink was observed, it was found that the black ink penetrated the ultraviolet absorbing layer, while the fluorescent ink also penetrated the ultraviolet absorbing layer, and in some cases, these were mixed in the ultraviolet absorbing layer. As a result, it was found that the emission of fluorescence emitted from the fluorescent ink was absorbed by the black ink, and the emission intensity was reduced.
[0005]
In addition, even in the case where the back coat layer is not provided, in the case where the base material is a coarse paper such as high quality paper that easily penetrates, both the printing ink and the fluorescent ink penetrate into the base material and are mixed with each other. It was also found that the same decrease in fluorescence intensity was caused.
It is conceivable to prevent such a decrease in the emission intensity of the fluorescence due to the printing ink such as the black ink by increasing the thickness of the back coat layer such as the ultraviolet absorbing layer. However, when the thickness of the back coat layer is large, there are problems such as difficulty in drying and an unnecessary glossiness. There is also a problem that the cost is increased.
[0006]
Therefore, an object of the present invention is to provide a fluorescent printing material that can stably obtain a light emission intensity of a certain level or more when a fluorescent printing layer is formed, regardless of the color and coloring material of the printing layer on the base material. It is in.
Another object of the present invention is to provide a method for producing a fluorescent printed matter that can stably obtain a light emission intensity of a certain level or more irrespective of the color and color material of a printing layer on a substrate.
Still another object of the present invention is to provide a fluorescent printed matter which can stably obtain a light emission intensity of a certain level or more irrespective of the color and coloring material of a printing layer on a substrate.
[0007]
[Means for Solving the Problems]
The present invention is a material for printing using an ink containing a fluorescent material, and at least on the printing layer on a substrate having a printing layer.To prevent crossing of ink between the printing layer and the fluorescent printing layer formed by the ink.The present invention relates to a fluorescent printing material having a water-repellent layer. The present invention also relates to a method for producing a fluorescent printed matter, characterized by printing an ink containing a fluorescent material on the fluorescent printing material of the present invention. Furthermore, the present invention relates to a fluorescent printed matter having a fluorescent printing layer containing a fluorescent material on the fluorescent printing material of the present invention.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail.
The fluorescent printing material of the present invention has a water-repellent layer on a substrate having a printing layer.
There is no particular limitation on the printing layer applied on the substrate, and the printing layer is used for ordinary printing. For example, the printing layer is composed of at least a coloring material and a vehicle. The coloring material may be either a pigment or a dye. Further, there is no limitation on the color of the coloring material, and it may be black which is difficult to obtain fluorescent light emission. Further, the printing layer can be provided on the entire surface or a part of the base material, and can be characters, figures, patterns, and the like.
[0009]
Examples of the substrate include a resin film and paper. Examples of the resin film include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyethylene oxide, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyether, polyester, polyethylene terephthalate, nylon, cellulose acetate, ethyl cellulose, and cellulose nitrate. And a film made of a resin such as propylcellulose. Paper includes high-grade printing paper, middle-grade printing paper, lower-grade printing paper, coated paper, lightweight coated paper, cast coated paper (mirror coated paper), embossed paper, art post paper, art paper, thin paper printing paper, and finely coated printing. Examples include paper, whitening agent-containing paper, paraffin paper, resin-impregnated paper, synthetic paper, fancy coated paper, pure white roll coated paper, high-quality paper, fluorescent paper, and special printing paper (such as postcards made by government).
[0010]
The fluorescent printing material of the present invention has a water-repellent layer on at least the printing layer from the viewpoint of preventing the ink from intersecting between the printing layer and the fluorescent printing layer. However, it is of course possible to form a water-repellent layer on the entire surface of the substrate, including the portion without the print layer.
The water-repellent layer is, for example, a layer containing a water-repellent or a water- and oil-repellent in a resin.
As the water repellent or water repellent, those usually used as a water repellent or water repellent or those used for other purposes are used as water repellents or water repellents. Can be used. For example, the following can be used: FS-antifoam 013B (manufactured by Toray Silicone Dow Corning); a fluorine-based surfactant such as Megafac F142-D (manufactured by Dainippon Ink and Chemicals, Inc.); For example, BYK-307 / 335 (manufactured by BYK Chemie); an emulsion type silicone antifoaming agent, that is, an oil-in-water emulsion obtained by emulsifying a silicone compound with various emulsifiers, for example, SH5503 (manufactured by Toray Silicone), SH5510 (manufactured by Toray Silicone) Silicone), SM5513 (Toray Silicone), SH5561 (Toray Silicone), SH5504 (Toray Silicone), SH5507 (Toray Silicone), SM5514 (Toray Silicone), SH8730 (Toray Silicone) ), SH5501 (manufactured by Toray Silicone), SH5505 (manufactured by Toray Silicone), SM5511 (manufactured by Toray Silicone), SM5512 (manufactured by Toray Silicone), SM5515 (manufactured by Toray Silicone), SM5517 (manufactured by Toray Silicone), SM5571 (manufactured by Toray Silicone Co., Ltd.), SM5572 (manufactured by Toray Silicone Co., Ltd.), SM5572F (manufactured by Toray Silicone Co., Ltd.) and SM5573 (manufactured by Toray Silicone Co., Ltd.); silicone emulsions such as LE-45 (manufactured by NUC SILICONES), LE-46 ( LE-48 (manufactured by NUC SILICONES), LE450 (manufactured by NUC SILICONES), LE-460 (manufactured by NUC SILICONES), LE463 (manufactured by NUC SILICONES) SILICONES), LE3430 (NUC SILICONES), Formasil-45 (NUC SILICONES), LE9300 (NUC SILICONES), FZ-315 (NUC SILICONES); Emulsion type water / oil repellent, for example, Dick Guard F-52S (manufactured by Dainippon Ink), Dickguard F-70 (manufactured by Dainippon Ink), Dickguard F-18 (manufactured by Dainippon Ink), Dickguard F-90 (manufactured by Dainippon Ink) Dickguard F-90N (Dainippon Ink), Dickguard FS-90H (Dainippon Ink), Dickguard FS-1 (Dainippon Ink), Dickguard F-400 (Dainippon Ink) Made).
[0011]
As a resin serving as a vehicle component forming the water-repellent layer, a resin that is substantially transparent to visible light can be used. Examples of such a resin include polyethylene [polyethylene (PE), ethylene-vinyl acetate copolymer (EVA), vinyl chloride-vinyl acetate copolymer], polypropylene (PP), and vinyl [polyvinyl chloride ( PVC), polyvinyl butyral (PVB), polyvinyl alcohol (PVA), polyvinylidene chloride (PVdC), polyvinyl acetate (PVAc), polyvinyl formal (PVF)], polystyrene [polystyrene (PS), styrene-acrylonitrile copolymer (AS), ABS], acrylic (polymethyl methacrylate (PMMA), MMA-styrene copolymer), polycarbonate (PC), cellulose (ethyl cellulose (EC), cellulose acetate (CA), propyl cellulose (CP), Cellulose acetate / butyrate (CAB), cellulose nitrate (CN)], fluorine-based [polychlorofluoroethylene (PCTFE), polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoroethylene copolymer (FEP), polyvinylidene fluoride ( PVdF)], urethane type (PU), nylon type [type 6, type 66, type 610, type 11], polyester type [polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexane terephthalate (PCT)], A thermoplastic resin such as polyvinylpyrrolidone (PVP) can be used.
[0012]
Further, these resins can be emulsions for waterborne paints. Examples of emulsions for water-based paints include vinyl acetate (homo) emulsion, vinyl acetate-acrylate copolymer resin emulsion, vinyl acetate-ethylene copolymer resin emulsion (EVA emulsion), and vinyl acetate-vinyl versateton copolymer. Resin emulsion, vinyl acetate-polyvinyl alcohol copolymer resin emulsion, vinyl acetate-vinyl chloride copolymer resin emulsion, acrylic emulsion, acrylic silicone emulsion, styrene-acryl copolymer resin emulsion, polystyrene emulsion, urethane emulsion, chlorinated polyolefin emulsion, epoxy Acrylic dispersion, SBR latex and the like can be mentioned.
[0013]
The water-repellent layer prevents the crossing of the ink between the print layer and the fluorescent print layer, regardless of the presence of the background print layer, from the viewpoint of obtaining a fluorescence emission intensity with less variation, the water-repellent agent, The type and content of the water / oil repellent, the thickness of the layer, and the like are appropriately determined. Also, the compatibility of the resin with the water repellent or the water / oil repellent is taken into consideration. However, the thickness of the water-repellent layer is suitably in the range of, for example, 0.1 to 5 μm, and preferably in the range of 0.5 to 1 μm in consideration of ease of drying, glossiness, cost, and the like. is there.
The fluorescent printing material of the present invention may have an ultraviolet absorbing layer at least on the water repellent layer or at least between the printing layer and the water repellent layer.
[0014]
The ultraviolet absorbing layer is, for example, a layer containing an ultraviolet absorbing agent in a resin or the like.
Examples of the ultraviolet absorber include benzophenone-based, benzotriazole-based, acrylate-based, and salicylate-based ultraviolet absorbers. Further, as the benzophenone-based ultraviolet absorber, for example, 2-hydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2,4-dihydroxybenzophenone, resorcinol Monobenzoate, 2,4-di-t-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate, 2-hydroxy-4-n-octylbenzophenone and the like can be mentioned.
[0015]
Examples of the benzotriazole-based ultraviolet absorber include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole (Tinuvin P, manufactured by Ciba Geigy), 2- (2′-hydroxy-3′-t-butyl) -5'-methylphenyl) -5-chlorobenzotriazole (Tinuvin 326, manufactured by Ciba Geigy), 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl)] phenyl] -2H-benzotriazole (Tinuvin 234, manufactured by Ciba Geigy) and the like.
[0016]
Examples of the acrylate-based ultraviolet absorber include 2-ethylhexyl-2-cyano-3,3-diphenyl acrylate and ethyl-2-cyano-3,3-diphenyl acrylate.
Examples of the salicylate-based ultraviolet absorber include phenyl salicylate, 4-t-butylphenyl salicylate, p-octylphenyl salicylate and the like.
[0017]
The resin serving as the vehicle component forming the ultraviolet absorbing layer may be the resin described as the vehicle component forming the water-repellent layer.
The UV absorber is preferably substantially fixed in the UV absorbing layer. Further, the ultraviolet absorbing layer is substantially transparent to visible light. The fixing of the ultraviolet absorbent to the ultraviolet absorbing layer means that the ultraviolet absorbent does not substantially move to the fluorescent printing layer even if the fluorescent printing layer is formed directly on the ultraviolet absorbing layer. For example, by selecting the ultraviolet absorber from the group consisting of particles having an ultraviolet absorbing ability or a resin having an ultraviolet absorbing functional group, an ultraviolet absorbing layer in which the ultraviolet absorber is substantially fixed can be formed.
The particulate matter having an ultraviolet absorbing ability is, for example, an ultraviolet absorbing inorganic pigment, and examples of the ultraviolet absorbing inorganic pigment include zinc oxide and titanium oxide. From the viewpoint that these particles are substantially transparent to visible light and do not substantially move to the fluorescent printing layer, the particle diameter is suitably in the range of 0.01 to 1 μm.
[0018]
The resin having an ultraviolet absorbing functional group can be, for example, a resin in which an ultraviolet absorbent such as tinuvin is chemically bonded to the resin. Examples of such resins include, for example, emulsion tinuvin (manufactured by Ciba-Geigy).
It is appropriate to select the thickness of the ultraviolet absorbing layer so that the reflectance from the ultraviolet absorbing layer becomes substantially 0 (zero). For example, when the ultraviolet absorber is emulsion tinuvin and the wavelength of the light source is 254 nm, the thickness of the ultraviolet absorbing layer is sufficient to be 1 μm or less, for example, suitably in the range of 0.1 to 1 μm. When the wavelength of the light source is 350 nm, the thickness of the ultraviolet absorbing layer is suitably, for example, in the range of 3 to 5 μm.
[0019]
In the fluorescent printing material of the present invention, the water-repellent layer may have an ultraviolet absorbing ability. The water-repellent layer having an ultraviolet absorbing ability can be formed by including an ultraviolet absorber together with the water-repellent or the water- and oil-repellent. As the ultraviolet absorber, those described above can be used. The type and content of the water repellent or water repellent or ultraviolet absorbent of the water repellent layer having ultraviolet absorbing ability, the thickness of the layer, etc. are determined in consideration of the water repellency and ultraviolet absorbing ability required for the layer. It can be determined appropriately. However, in consideration of the ease of drying, glossiness, Kotos, etc., the thickness is suitably in the range of, for example, 0.1 to 5 μm, and preferably in the range of 0.5 to 1 μm.
[0020]
In the fluorescent printing material of the present invention, a protective layer may be further provided on the uppermost layer.
The protective layer is optically substantially impermeable to the fluorescent dye in the fluorescent ink and the ultraviolet absorber in the ultraviolet absorbing layer, and is substantially transparent to ultraviolet light and visible light. Anything is acceptable. Further, the protective layer is preferably a resin on which the fluorescent ink is applied, that is, a resin which is dissolved by a solvent constituting the fluorescent dye ink and in which the fluorescent dye or the resin containing the fluorescent dye is easily fixed in the protective layer resin. Appropriate.
The thickness of the protective layer is suitably determined in consideration of the viewpoint that the mixing of the ultraviolet absorbent and the fluorescent dye can be effectively prevented. For example, it is appropriate that the thickness is in the range of 0.2 to 5 μm.
The fluorescent printing material of the present invention is suitable for use in printing using an ink containing a fluorescent material, and the fluorescent material may be a fluorescent dye. The fluorescent material may be a transparent fluorescent material, and a transparent fluorescent print layer can be formed by using an ink containing the transparent fluorescent material.
[0021]
Next, a method for producing the fluorescent printing material of the present invention will be described.
The fluorescent printing material of the present invention can be manufactured by forming a water-repellent layer on a substrate having a printing layer using a bar coater, an ink jet printer, a spray coater, a laminator, or the like.
Further, when the fluorescent printing material of the present invention also has an ultraviolet absorbing layer, on the substrate having a printing layer, a water-repellent layer and an ultraviolet-absorbing layer or an ultraviolet-absorbing layer and a water-repellent layer, sequentially bar coater, inkjet printer, It can be manufactured by forming using a spray coater or the like.
[0022]
Each layer is formed by a spray coater by discharging ink from a narrow-mouth nozzle by a pump pressure to form a uniform thin film. The film thickness can be adjusted by changing the viscosity of the ink, the nozzle diameter, the air or pump pressure, and the speed at which the substrate is carried out.
When a spray coater is used, a uniform and thin coating film can be formed.
The formation of each layer by the ink jet printer is performed by discharging ink from nozzles using a vibration pressure of a piezo element by a pulse signal to form a dot pattern.
The use of an ink jet printer enables a uniform and thin coating film to be formed.
[0023]
Next, the method for producing a fluorescent print of the present invention will be described.
The method for producing a fluorescent print of the present invention is characterized in that an ink containing a fluorescent material is printed on the fluorescent printing material of the present invention.
The fluorescent material includes a fluorescent dye and a fluorescent pigment. Fluorescent dyes have the feature of high emission intensity, and fluorescent pigments have the advantage that they have low light emission intensity but are excellent in light resistance as compared with fluorescent dyes. It can be used appropriately according to the application.
The above-mentioned fluorescent dye may be any dye that generates fluorescence when irradiated with excitation light, and may be colored or colorless. As colorless fluorescent dyes, EB-501 (manufactured by Mitsui Toatsu Dye Co., emission color: blue), EG-302 (manufactured by Mitsui Toatsu Dye Co., emission color: yellowish green), EG-307 (Mitsui Toatsu Dye) Ubitec called ER-120 (Mitsui Toatsu Dye Co., Ltd., emission color: red), ER-122 (Mitsui Toatsu Dye Co., Ltd., emission color: red), or fluorescent brightener OB (manufactured by Ciba Geigy, emission color: blue) and the like.
[0024]
Colored fluorescent dyes have the property of emitting light in the same color as coloring, for example, basic dyes such as cationic brilliant flavin (yellow), cationic brilliant red (red), cationic brilliant pink (peach), and spiron yellow (Yellow), Spiron red (red), sot pink (peach) (manufactured by Hodogaya Chemical Co., Ltd.), basic yellow, rhodamine B, and the like.
Examples of the fluorescent pigment include Lomicol 100 (manufactured by Nippon Fluorochemicals).
[0025]
In the method for producing a fluorescent printed material of the present invention, the fluorescent material contained in the ink containing the fluorescent material may be a transparent fluorescent material. Layers can be formed.
The fluorescent printing layer can be formed using a bar coater, an ink jet printer, or a spray coater, and may be formed by the same method as that for forming the water-repellent layer or the ultraviolet absorbing layer, or by a different method.
For example, the water-repellent layer and the ultraviolet-absorbing layer or the ultraviolet-absorbing / water-repellent layer can be formed by using a spray coater, and the fluorescent printing layer can be formed by an inkjet printer.
[0026]
In the method for producing a fluorescent print of the present invention, the ink containing the fluorescent dye is preferably printed by an inkjet method.
The ink jet method uses a vibration pressure of a piezo element generated by a pulse signal to eject ink from a nozzle to form a dot pattern, or to apply an electric field to a low-viscosity high-speed ink flow containing an electrolyte. There is a method of forming a dot pattern by separating minute droplets of ink by applying the ink.
The use of the inkjet method has an advantage that high-speed printing is possible particularly when printing a barcode.
An inkjet ink containing a fluorescent dye can contain the above fluorescent dye, a vehicle, water and an aqueous organic solvent.
As the vehicle, for example, the resin exemplified as the resin serving as the vehicle component constituting the water-repellent layer in the first embodiment can be used. The water may have a purity higher than that of ion-exchanged water.
[0027]
The water-soluble organic solvent is used for the purpose of preventing drying of the ink and imparting permeability. For example, polyhydric alcohols such as ethylene glycol, diethylene glycol, polyethylene glycol, and glycerin: N-alkylpyrrolidones: esters such as ethyl acetate and amyl acetate Classes: Lower alcohols such as methanol, ethanol, propanol, and butanol: Glycol ethers such as ethylene oxide or propylene oxide adducts of methanol, butanol, and phenol. These water-soluble organic solvents are not limited to the above solvent examples, and may be used alone or in combination as appropriate, taking into account the solvent's hygroscopicity, moisture retention, dye solubility and permeability, ink viscosity and freezing point, and the like. Used in. The use amount of these water-soluble organic solvents is preferably in the range of 0.1 to 70% by weight of the ink.
[0028]
In order to satisfy various conditions required for the system of the inkjet recording apparatus, it is possible to add an additive conventionally known as a component of the ink, if necessary. These additives include alcohol amines and ammonium salts as pH adjusters, and metal hydroxides: organic salts and inorganic salts as resistivity adjusters: antioxidants: preservatives: antifungal agents: sequestering agents. And a chelating agent. In addition to the above composition, water-soluble resins such as polyvinyl alcohol, polyvinyl vilolidone, carboxymethyl cellulose, styrene acrylic acid resin, and styrene maleic acid resin are used to such an extent that clogging of the injection nozzle portion and change in the ink ejection direction do not occur. Can also be added.
[0029]
The fluorescent print of the present invention is a print having a fluorescent print layer containing a fluorescent material on the water-repellent layer of the fluorescent print material of the present invention. Referring to FIG. 1, it is a printed material having a fluorescent print layer 3 containing a fluorescent dye on a water-repellent layer 2 on a substrate 1 having a print layer.
A fluorescent printed matter according to another aspect of the present invention is a printed matter having a fluorescent printing layer containing a fluorescent dye on the ultraviolet absorbing layer of the fluorescent printing material of the present invention having the ultraviolet absorbing layer. Referring to FIG. 2, the printed matter has an ultraviolet absorbing layer 4 on a water-repellent layer 2 on a substrate 1 having a printing layer, and a fluorescent printing layer 3 containing a fluorescent dye thereon. The water-repellent layer 2 can be a water-repellent layer having an ultraviolet absorbing ability.
A fluorescent printed material according to another aspect of the present invention is a printed material having a fluorescent printing layer containing a fluorescent dye on a water-repellent layer of the fluorescent printing material of the present invention having the ultraviolet absorbing layer. Referring to FIG. 3, the printed matter has a water repellent layer 2 on an ultraviolet absorbing layer 4 on a substrate 1 having a printed layer, and a fluorescent printed layer 3 containing a fluorescent dye thereon.
The base material, printing layer, water repellent layer, ultraviolet absorbing layer and ultraviolet absorbing / water repellent layer are each those described above for the fluorescent printing material. The fluorescent printing layer can be formed by the printing method described in the method for manufacturing a fluorescent printed material.
By forming the fluorescent printing layer using an ink containing a transparent fluorescent material, a printing layer that cannot be identified by the naked eye can be obtained.
[0030]
【Example】
Hereinafter, the present invention will be further described based on examples.
Example 1
A high-quality paper (180 kg) on which black ink was printed on the entire surface was used as a base material, and a water-repellent layer having a thickness of 1 μm was formed thereon with a bar coater using an ink having the following composition.
Ink composition for forming water-repellent layer
PVP resin (K-90, manufactured by IS Japan Co., Ltd.) 4.0 parts by weight
48.0 parts by weight of water
48.0 parts by weight of isopropyl alcohol
Megafax F142-D 3.0 parts by weight
(Dai Nippon Ink Chemical Industry Co., Ltd.)
A 0.1 μm-thick fluorescent print layer was formed on the water-repellent layer by an inkjet printer using the fluorescent print layer forming ink (1) having the following composition.
Ink composition for forming fluorescent print layer
80.0 parts by weight of fluorescent dye
15.0 parts by weight of water
Acrylic resin (AW-36H, manufactured by Seiko Chemical Co., Ltd.) 5.0 parts by weight
The fluorescent dye is a dye that is transparent to visible light and emits red light having a wavelength of 611 nm by ultraviolet light having a wavelength of 350 nm.
[0031]
Comparative Example 1
A fluorescent print was produced in the same manner as in Example 1, except that the ink for forming the water-repellent layer was changed to the ink having the following composition.
PVP resin (K-90, manufactured by IS Japan Co., Ltd.) 4.0 parts by weight
48.0 parts by weight of water
48.0 parts by weight of isopropyl alcohol
[0032]
Test example 1
The fluorescence emission of the fluorescent printed matter prepared in Example 1 and Comparative Example 1 was measured using 350 nm ultraviolet light as a light source. As shown in the chart of FIG. 4, the fluorescent printed matter produced in Example 1 showed fluorescence emission, but the fluorescent printed matter produced in Comparative Example 1 did not emit fluorescent light.
[0033]
Example 2
A fluorescent print was prepared in the same manner as in Example 1, except that the ink having the following composition was used as the water-repellent layer forming ink.
Ink composition for forming water-repellent layer
PVP resin (K-90, manufactured by IS Japan Co., Ltd.) 4.0 parts by weight
48.0 parts by weight of water
48.0 parts by weight of isopropyl alcohol
FS-antifoam 013B 3.0 parts by weight
(Toray Silicon Dow Corning)
The fluorescent emission of the obtained fluorescent printed matter was measured using ultraviolet light of 350 nm as a light source. As shown in the chart of FIG. 5, fluorescence emission was observed.
[0034]
【The invention's effect】
When a fluorescent printed matter is produced using the fluorescent printing material of the present invention, stable fluorescent light emission having high emission intensity can be obtained irrespective of the color and coloring material of the printing layer.
[Brief description of the drawings]
FIG. 1 is an explanatory sectional view of a fluorescent printed matter of the present invention.
FIG. 2 is an explanatory sectional view of a fluorescent printed matter of the present invention.
FIG. 3 is an explanatory sectional view of a fluorescent printed matter of the present invention.
FIG. 4 is a graph showing the fluorescence emission intensity of the fluorescent printed matter of Example 1.
FIG. 5 is a graph showing the fluorescence emission intensity of the fluorescent printed matter of Example 2.

Claims (12)

A material for printing using an ink containing a fluorescent material, at least on the printing layer on a substrate having a printing layer, the ink between the printing layer and the fluorescent printing layer formed by the ink A fluorescent printing material having a water-repellent layer for preventing crossing . The fluorescent printing material according to claim 1, further comprising an ultraviolet absorbing layer on at least the water repellent layer. The fluorescent printing material according to claim 1, further comprising an ultraviolet absorbing layer between at least the printing layer and the water-repellent layer. The fluorescent printing material according to claim 1, wherein the water-repellent layer also has an ultraviolet absorbing ability. The fluorescent printing material according to any one of claims 1 to 4, wherein the fluorescent material is a fluorescent dye. The fluorescent printing material according to any one of claims 1 to 5, wherein the fluorescent material is a transparent fluorescent material. A method for producing a fluorescent printed matter, comprising printing an ink containing a fluorescent material on the fluorescent printing material according to any one of claims 1 to 6. The method according to claim 7, wherein the fluorescent material is a fluorescent dye. 9. The method according to claim 7, wherein the fluorescent material is a transparent fluorescent material. A fluorescent printed matter having a fluorescent printing layer containing a fluorescent dye on the fluorescent printing material according to any one of claims 1 to 6. The fluorescent printed matter according to claim 10, wherein the fluorescent printed layer is a printed layer formed of an ink containing a fluorescent dye. The fluorescent printed matter according to claim 10 or 11, wherein the fluorescent printed layer is a printed layer formed of an ink containing a transparent fluorescent material.

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