JPH107956A - Penetrating fluorescent ink and print produced by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a penetrating fluorescent ink used to give prints prevented from undergoing injustice and having the advantages (e.g. quick drying properties) of an ultraviolet-curing ink and prints produced by using the same. SOLUTION: Character, figure of like information 2 to be prevented from undergoing injustice such as falcication are printed on paper 1 by using a penetrating fluorescent ink dispersed in a vehicle containing at least an ultraviolet- curing resin component and a bleed accelerating solution. As a result, the fluorescent dye bleeds around the character figure or like information 2. Therefore, they can be prevented from undergoing injustice such as falcification.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent penetrating ink which can be used in the manufacture of printed matter such as securities to prevent tampering of printed characters and numerical information and the like and forgery of printed matter. And printed matter produced using the same.

[0002]

2. Description of the Related Art Heretofore, there has been a printed matter in which characters and numerical information, which are to be protected from tampering or the like formed on paper, are printed using a permeable ink in which a coloring agent and a fluorescent pigment or dye are dispersed in a vehicle. .

When the printed matter is irradiated with ultraviolet rays, a light emission slightly larger than that of the characters, numerals and the like is generated around the characters and numerals. This is because the fluorescent pigment or dye contained in the permeable ink is more likely to cause bleeding (penetration and bleeding) than the coloring agent serving as character and numerical information. It should be noted that if such a printed matter has been tampered with, such as falsification of characters, no light emission occurs around that portion, so that tampering can be detected.

A conventional permeable ink is an oxidative polymerization type ink which uses a drying oil (linseed oil and its modified oil) or an alkyd resin as a vehicle and oxidizes and polymerizes with air in the air to dry (cur). It is. Therefore, it takes time to dry the ink. Further, the ink contains a solvent. Further, there is a disadvantage that the colorant in the ink also bleeds, and characters and numerical information are likely to be unclear.

[0005] The inventors of the present invention have made a trial production of an ink prepared by mixing a fluorescent dye into an ultraviolet curable ink which is cured by reaction polymerization with ultraviolet light and evaluated. However, no light emission could be confirmed around the characters, numeric information, etc. of the printed matter using this. This is probably because the fluorescent dye hardly bleeds because the vehicle is instantaneously and firmly cured by the irradiation of ultraviolet rays during drying.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of such problems, and has as its object the advantage of using an ultraviolet curable ink, such as quick drying, while preventing illegal use. An object of the present invention is to provide a penetrable fluorescent ink and printed matter that can be prevented.

[0007]

According to a first aspect of the present invention, there is provided a penetrating fluorescent ink in which a colorant and a fluorescent dye are dispersed in a vehicle containing at least a resin component curable by irradiation with ultraviolet rays and a bleed accelerating liquid. It is a feature.

Hereinafter, the permeable fluorescent ink according to the present invention will be described in detail. Coloring agents, after printing, various colored pigments to be included for visually displaying characters, numerical information, and the like,
It is a coloring material such as a dye. It is necessary that the coloring material is less bleeding than the fluorescent dye described below.

Examples of the colorant of the present invention include azo pigments such as carbon black, titanium white, soluble azo pigment, insoluble azo pigment and condensed azo pigment, phthalocyanine pigments such as phthalocyanine blue pigment and phthalocyanine green pigment, and quinacridone pigments. Isoindolinone pigments, perylene / perinone pigments, dioxazine pigments,
There are inorganic pigments and organic pigments such as anthraquinone pigments, anthanthrone pigments, and indanthrone pigments.

[0010] After printing, the fluorescent dye causes bleeding around characters, numerical information, and the like, and is recognized by irradiation of ultraviolet rays. Further, it is preferable that the color is colorless or similar to that of the paper so that the paper itself is not visually observed.

The fluorescent dyes of the present invention include stilbene compounds such as diaminostilbenesulfonic acid and distilbene, diaminodiphenyl compounds such as benzidine, benzidinesulfonic acid and diaminofluorine, imidazole compounds such as imidazolone and triazole, thiazole compounds and oxazole compounds. And fluorescent dyes such as coumarin-based, carbostyril-based, naphthalimide-based, pyrazolone-based, and dihydropyridine-based dyes.

Next, the resin component which is cured by irradiation with ultraviolet rays includes acrylic acid ester of polyhydric alcohol, epoxy acrylate, urethane acrylate, polyester acrylate, polyether acrylate, acrylate alkyd, Polymerization reactive resin (oligomer or prepolymer) such as melamine acrylate, cut monomer such as monoacrylate, diacrylate, triacrylate, etc., and mixture of photopolymerization initiator such as benzoin ethers and benzophenone or sensitizer, etc. No.

A bleed accelerating liquid is a liquid that inhibits the complete curing of the vehicle by ultraviolet irradiation and consequently promotes the bleeding of the fluorescent dye. Further, it is more preferable that the coloring agent hardly dissolves the coloring agent and dissolves the fluorescent dye.

[0014] Specific examples of such a bleed accelerating liquid include polypropylene glycol, higher alcohols and ethers. Among them, polypropylene glycol, in which bleeding easily occurs, is particularly preferable.

That is, a permeable fluorescent ink according to a second aspect is based on the premise of the first aspect, characterized in that the bleed accelerating liquid is polypropylene glycol.

Then, the resin component and the bleed accelerating liquid which are cured by the irradiation of the ultraviolet rays are used as a vehicle, and the colorant and the fluorescent dye are dispersed.

The permeable fluorescent ink thus obtained is subjected to offset printing or letterpress printing of character information 2 on high quality paper 1 by using various printing methods to produce a printed material (see FIG. 1). .

That is, in the printed matter according to the third aspect, a character component and a numerical information component to be prevented from being tampered with, such as tampering, on a paper, a coloring agent and a fluorescent dye, at least a resin component which cures by irradiation of ultraviolet rays, and a bleed. The printing is carried out using a permeable fluorescent ink dispersed in a vehicle containing an accelerating liquid.

When this printed matter is irradiated with ultraviolet light,
Since the fluorescent dye bleed 3 around the character information 2, a light emission slightly larger than that of the character and numeral information was generated (see FIG. 2).

[0020]

According to the first aspect of the present invention, since the bleed accelerating liquid inhibits the complete curing of the vehicle, bleeding is likely to occur.

According to the permeable fluorescent ink according to the second aspect of the present invention, bleeding is particularly likely to occur in polypropylene glycol.

According to the printed matter according to the third aspect of the present invention, the fluorescent dye bleeds around characters, numeral information, and the like, which are to be protected from tampering or the like on paper.

[0023]

An embodiment of the present invention will be described below in detail with reference to the drawings.

Example The following composition was kneaded with a three-roll mill to produce a permeable fluorescent ink.

(Permeable Fluorescent Ink Composition) Colorant Carbon Black 12 parts Fluorescent Dye KaylightB (manufactured by Nippon Kayaku) 0.5 part Acrylic oligomer EB-3700 (manufactured by Daicel UCB) 35 parts DPHA (Nippon Kayaku Co., Ltd.) 15 parts OTA-480 (manufactured by Daicel UCB) 20 parts Photosensitizer Benzophenone 10 parts 4,4'bisdiethylaminobenzophenone 3 parts Bleed accelerating liquid polypropylene glycol 1 part Additive Hydroquinone 0.5 parts Polyethylene wax 3 parts

Next, after the letter "T" was printed on high quality paper by offset printing using the above permeable fluorescent ink, the permeable fluorescent ink was cured by irradiating ultraviolet rays to obtain a printed product. When the printed matter was irradiated with ultraviolet light, blue fluorescent light emission due to bleeding of a fluorescent dye was observed around the letter "T". It should be noted that the presence of bleed could not be confirmed without irradiating the printed matter with ultraviolet rays.

Comparative Example An ink containing no bleed accelerating liquid was prepared from the above permeable fluorescent ink composition, and a printed material similar to that of the example was obtained. When the printed matter was irradiated with ultraviolet light, almost no fluorescence was emitted around the letter "T" due to the bleeding of the fluorescent dye.

[0028]

According to the permeable fluorescent ink according to the first aspect of the present invention, the colorant and the fluorescent dye are dispersed in a vehicle containing at least a resin component curable by irradiation with ultraviolet rays and a bleed accelerating liquid. In addition, since the bleed accelerating liquid hinders complete curing of the vehicle, bleeding is likely to occur. Therefore, it is possible to prevent illegality while having the advantage of the ultraviolet curable ink such as quick drying.

According to the second aspect of the present invention, since the bleed accelerating liquid is polypropylene glycol, bleeding easily occurs. Therefore, it is easy to recognize the bleeding fluorescent dye on the paper under ultraviolet rays.

According to the printed matter according to the third aspect of the present invention, a resin that cures a colorant and a fluorescent dye at least by irradiating ultraviolet rays with characters and numeric information to be prevented from being tampered with or the like formed on paper. Since printing was performed using a permeable fluorescent ink dispersed in a vehicle containing the components and the bleed accelerating liquid, a fluorescent dye bleeds around characters and numeric information, etc., on which it is desired to prevent tampering and the like on paper. Therefore, it is possible to prevent fraud such as falsification of character and numerical information.

[0031]

[Brief description of the drawings]

FIG. 1 is a plan view showing a printed material manufactured using a permeable fluorescent ink.

FIG. 2 is a plan view showing a bleed state of a printed matter manufactured using a permeable fluorescent ink.

[Explanation of symbols]

 1 paper 2 character information 3 bleed

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G03G 21/00 560 G03G 21/00 560

Claims (3)

[Claims] 1. A penetrating fluorescent ink comprising a colorant and a fluorescent dye dispersed in a vehicle containing at least a resin component curable by irradiation with ultraviolet light and a bleed accelerating liquid. 2. The fluorescent penetrating ink according to claim 1, wherein the bleed accelerating liquid is polypropylene glycol. 3. A character and numeral information to be prevented from being tampered with and formed on paper are dispersed in a vehicle containing at least a resin component curable by irradiation with ultraviolet rays and a bleed accelerating liquid. Printed matter characterized by being printed using the permeable fluorescent ink.