KR100344078B1 - Intaglio ink formulations having infrared reflection property and method for using the same - Google Patents

Abstract

The present invention relates to an infrared reflective intaglio ink composition and a method of using the same, and more particularly to an infrared reflective blue pigment composed of a mixture of a metal oxide of Co.Al or Co.Al.Cr, and / or Co.Zn. 5-25 wt% of colored pigments including infrared reflective green pigments consisting of a mixture of Ni, Ti, Co, Zn, Cr, Ti metal oxides, 20-25 wt% of fillers, 30-35 wt% of varnishes, and 15 to 15 The present invention relates to an infrared reflective intaglio ink composition composed of 25 wt% and having reflection characteristics in the infrared region of 700 nm to 950 nm, and a method of using the composition in banknotes or various securities. Since the composition of the present invention has an infrared reflecting property, it is possible to identify and stomach by instrument reading, anti-tamper effect and automatic inspection, and have excellent characteristics of alkali solution indentation and printability in intaglio printing.

Description

Intaglio ink formulations having infrared reflection property and method for using the same

The present invention relates to an infrared reflective intaglio ink composition and a method of using the same. More specifically, one side of a printing surface is divided into two parts, and one side is a conventional infrared absorption ink (hereinafter referred to as "A ink"), and On the other hand, when printed in the same color using the infrared reflecting ink of the present invention (hereinafter referred to as "R ink"), the same color is visible in the visible region, but using the infrared spectrophotometer A ink in the infrared region of 700 ~ 950nm Is black because it has infrared absorption characteristics, and the R ink relates to an infrared reflective intaglio ink composition and a method of using the same, which are colorless due to infrared reflection characteristics.

In general, colored pigments have infrared absorption in the order of black, green, blue, and brown in the infrared region, and red and yellow have the characteristic of reflecting infrared rays. Therefore, when preparing two kinds of inks of the same color A and R, infrared absorbing ink should use infrared absorbing pigment or infrared absorbing agent, black pigment, and metal powder to make infrared absorbing ability, and infrared reflecting ink should use infrared reflecting pigment. do.

Many types of infrared absorbers have been developed, Japanese Patent Laid-Open No. 8-209110, Japanese Patent Laid-Open No. 8-349460, Japanese Patent Laid-Open No. 8-263658, Japanese Patent Laid-Open No. 7-164729, Japanese Patent Laid-Open No. 7- 53945, Japanese Patent Laid-Open No. 8-73792, and the like are generally used as offset printing inks with low ink volume.

On the other hand, intaglio ink consumes a lot of ink, so the amount of infrared absorber used in ink production is high, the cost of the absorbent is high, and there are disadvantages such as compatibility with ink manufacturing resins, problems with light resistance, heat resistance, and inorganic infrared absorber with specific gravity. It is large and has problems in practical use due to problems such as ink manufacturing aptitude and printing aptitude, and the blue and brown inks of US Patent 534,403 have insufficient infrared reflectance in the infrared region of 700 to 950 nm, and the sulfurization of Japanese Patent Laid-Open No. 8-34946. Infrared reflecting ink using bismuth as a black pigment has good reflectivity in the infrared region above 930nm, but has low reflectance in the infrared region below 930nm, and infrared absorption ink with metal powder has the disadvantage of poor color clarity and oxidation of metal powder. Carbon black has excellent infrared absorption and mixed color ink It is for.

Therefore, the present invention appears to be the same color in the visible region, but when using an infrared spectrophotometer appears to be colorless due to the infrared reflection characteristics in the infrared region of 700 ~ 950nm, the banking and various securities, etc. An object of the present invention is to provide an infrared reflective intaglio ink composition which can be applied to a product having an authenticity identification function and an automatic inspection element function.

Another object of the present invention is to provide a method for using the composition in banknotes and various securities.

In order to achieve the above object, the infrared reflective intaglio ink composition of the present invention is an infrared reflective blue pigment composed of a mixture of metal oxides of Co · Al or Co · Al · Cr, and / or Co · Zn · Ni · Ti or Co · It consists of 5-25 wt% of colored pigments, infrared ray reflecting green pigments composed of a mixture of metal oxides of Zn Cr Cr, 20-25 wt% of fillers, 30-35 wt% of varnishes, and 15-25 wt% of other auxiliaries. .

In order to achieve the above another object, the use method of the present invention consists of using the ink composition having the infrared reflecting ability together with the ink composition having the infrared absorbing ability in a portion of banknotes and various securities.

Figure 1 (a) is a schematic state diagram in the visible area when printed with a conventional green infrared absorption ink (A) and the green infrared reflective ink (R) according to the present invention on the printing surface; , (B) is a schematic diagram showing a state where the printed portion of the infrared absorption ink (A) appears black and the printed portion of the infrared reflection ink (R) does not show any color when the printed matter is viewed on an infrared spectrophotometer.

Looking at the present invention in more detail as follows.

The infrared reflective intaglio ink composition according to the present invention is an infrared reflective blue pigment composed of a mixture of metal oxides of Co · Al or Co · Al · Cr, and / or Co · Zn · Ni · Ti or Co · Zn · Cr · Ti It comprises 5-25 wt% of colored pigments containing an infrared reflecting green pigment composed of a mixture of metal oxides. The blue pigment has infrared reflectivity in the infrared region of 700 to 950 nm, and has good chemical resistance, weather resistance, ink manufacturing aptitude, and printability, and commercially available products include cobalt blue 1024, 1094, 1201, or 1040. Pigments also have infrared reflectivity in the infrared region of 700 to 950 nm, and have good chemical resistance, weather resistance, ink manufacturing aptitude, and printability, and include chrome green 2500, 2040, or 2024. The pigments may exhibit a desired color by including a small amount of pigments such as red and yellow, which absorb infrared rays, in addition to a blue pigment or a green pigment. Therefore, the blue pigment or the green pigment is preferably contained at least 50% by weight or more in the color pigments in terms of infrared reflection characteristics. In addition, the amount of the color pigments is preferably 5 to 25wt% with respect to the total ink composition, but less than 5wt% is insufficient reflection characteristics, when it exceeds 25wt% there is a tendency that the printability is poor but printability is insufficient. .

As other components used in the present invention, fillers include calcium carbonate, barium sulfate, talc, silicon dioxide, and the like, and the amount thereof is preferably 20 to 25 wt%. At this time, if it is less than 20wt%, the corrosiveness is insufficient, and if it exceeds 25wt%, the color concentration is lowered and the transferability is insufficient.

The varnishes include a hydrofluoric intaglio varnish or a hydrofluoric gel varnish, and the amount thereof is preferably 30 to 35 wt%. If the amount of the varnish is less than 30 wt%, there is a lack of incorrosion, transferability, etc., and if the amount of the varnish is more than 35 wt%, there is a tendency that the dryness of the ink is delayed, resulting in the lack of incoherence.

As other auxiliaries, an aliphatic hydrocarbon solvent, a dispersant, and / or a drying agent may be used, and the amount thereof is preferably 15 to 25 wt%. At this time, if less than 15wt%, the fluidity of the ink is small and the tack is high, so that the transferability is insufficient, and if it exceeds 25wt%, the fluidity is increased and the sharpness and the indifference are lacking.

The raw materials thus prepared are mixed and ground four to five times in a three roll mill to adjust the physical properties of the ink suitable for intaglio printing.

On the other hand, when printed in the same color using a conventional infrared absorbing ink and the infrared reflecting ink of the present invention on at least a portion of at least one surface of banknotes or various securities, the visible color is the same color, but the infrared light of 700 to 950 nm Absorption ink has infrared absorption characteristics and reflection ink has infrared reflection characteristics in the area), so that it is possible to identify the authenticity and gastric status by device reading, anti-tamper effect and automatic inspection, and eliminate alkali solution during intaglio printing. And excellent printability.

For example, FIG. 1 is divided into two sides of a printing surface, and the left side is visible when printing with a normal green infrared absorption ink (A) and the right side with a green infrared reflection ink (R) according to the present invention. Both areas appear in the area, but the part printed with the infrared absorption ink (A) appears black while the part printed with the infrared reflection ink (R) shows no color when the print is viewed on an infrared spectrophotometer. It is shown schematically.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the scope of the present invention is not limited to the following Examples.

Example 1

Preparation of Green Ink

In general, an infrared absorbing green pigment and an infrared reflecting green pigment according to the present invention were mixed with the ingredients and amounts shown in Table 1, and then, four to five times were prepared in a meat tender to prepare two kinds of ink compositions suitable for intaglio printing suitability. . In this case, blue pigments (infrared reflections) may be used instead of green pigments (infrared reflections) or may be mixed.

Unit wt% ingredient Infrared Absorption Ink (A) Infrared Reflective Ink (R) Blue Pigment (Cyanineburu BN) 1.5 - Red Pigment (White Thread 1040) 0.5 1.0 Yellow pigment (Disazo el GRNF) 3.0 3.0 Black Pigment (RAVEN 1255) 1.3 - Green Pigment (Infrared Ray Reflection) (Chrome Green 2500) - 20.0 Fillers (calcium carbonate: precipitated barium sulfate: talc: silicon dioxide # 308 = 8: 2: 2: 1) 33.7 22 Varnish (KR-H-V: KR-HO-Gv = 2: 1) 35 32 Other auxiliary agents (aliphatic hydrocarbon solvents AHBC: Oleic acid: G-3300: Estel wax: Cobalt octoate = 10: 2: 2: 2: 4: 1) 25 22 system 100.00 100.00

Example 2

Preparation of Black Ink

In general, the infrared absorbing black pigment and the infrared reflecting black pigment according to the present invention were mixed with the components and amounts shown in Table 2, and then, four to five times were prepared in a meat grinder to prepare two kinds of ink compositions suitable for intaglio printability. . The same components as in Example 1 were used except for the red line reflective blue pigment. In this case, green pigments (infrared reflections) may be replaced or mixed with blue pigments (infrared reflections).

Unit wt% ingredient Infrared Absorption Ink (A) Infrared Reflective Ink (R) Red Pigment - 1.5 Yellow Pigment - 3.0 Black Pigment 7.0 - Blue pigment (infrared reflection) (cobalt blue 1024) - 20.0 Filler 43 22.5 Varnish 36 33 Other Supplements 24 20 system 100.00 100.00

Example 3

Preparation of Dark Blue Ink

In general, the infrared absorption deep blue pigment according to the present invention and the infrared reflecting deep blue pigment according to the present invention were mixed with the ingredients and amounts shown in Table 3, and then, the mixture was ground 4 to 5 times in a meat grinder to prepare two kinds of ink compositions suitable for intaglio printing suitability. . The same components as in Example 1 were used except for the red line reflective blue pigment. In this case, green pigments (infrared reflections) may be replaced or mixed with blue pigments (infrared reflections).

Unit wt% ingredient Infrared Absorption Ink (A) Infrared Reflective Ink (R) Blue Pigment 2.5 - Red Pigment 2.5 1.0 Black Pigment 1.0 - Blue pigment (infrared reflection) (cobalt blue 1024) - 25.0 Filler 44 21 Varnish 33 32 Other Supplements 17 21 system 100.00 100.00

Example 4

Preparation of Brown Ink

In general, the infrared absorbing brown pigment and the infrared reflecting brown pigment according to the present invention were mixed with the ingredients and amounts shown in Table 4, and then, four to five times were prepared in the meat grinder to prepare two kinds of ink compositions suitable for intaglio printing suitability. . The same components as in Example 1 were used except for the red line reflective blue pigment. In this case, green pigments (infrared reflections) may be replaced or mixed with blue pigments (infrared reflections).

Unit wt% ingredient Infrared Absorption Ink (A) Infrared Reflective Ink (R) Red Pigment 2.7 1.0 Yellow Pigment 2.7 6.0 Black Pigment 2.0 - Blue pigment (infrared reflection) (cobalt blue 1024) - 20.0 Filler 42.6 22 Varnish 34 31 Other Supplements 16 20 system 100.00 100.00

A test piece is prepared using an RI tester so that the thickness of each of the inks A and R prepared in Examples 1 to 4 is constant. The colors of these specimens (green, black, dark blue, brown) appear to be the same color in the visible region, but the absorbing ink becomes black when the specimens are visually checked in the infrared region of 780nm and 830nm using a video spectrometer (Projectina, Projectina). The reflection ink is transparent and shows infrared absorption characteristics and reflection characteristics. Also, by measuring the infrared reflection spectral characteristics with a UV / VIS / NIR spectrophotometer (Perkinelmer Co., Ltd.), the result is comparable with that of a video spectrometer. By using this characteristic, it has characteristics that can be utilized as stomach, tamper-evident effect and authenticity identification and equipment sensing application.

In addition, as a result of printing test of the ink prepared as described above in Super Orlof Intaglio, the printability is good and the printed matter can be obtained in video spectrometer and UV / VIS / NIR spectrophotometer.

As described above, the infrared reflective intaglio ink according to the present invention has the same color in the visible region but excellent infrared reflection characteristics in the infrared region, thereby maximizing the authenticity identification, stomach, and anti-tamper effect by device reading, and as an automatic correcting function element. It can be utilized, color can be diversified, and it has excellent features of intaglio ink manufacturing and printability.

Claims (6)

Infrared reflective blue pigment consisting of a mixture of metal oxides of Co, Al, or Co, Al Cr; and / or infrared reflective green pigment consisting of a mixture of metal oxides of Co, Zn, Ni, Ti, or Co, Zn, Cr, Ti. Infrared reflection comprising 5-25 wt% of colored pigments, 20-25 wt% of filler, 30-35 wt% of varnishes, 15-25 wt% of other auxiliaries, and reflecting characteristics in the infrared region of 700 nm to 950 nm. Type intaglio ink composition. The infrared reflective intaglio ink composition according to claim 1, wherein the colored pigments further comprise red and yellow pigments reflecting infrared rays. The infrared reflective intaglio ink composition according to claim 1, wherein the blue pigment and / or the green pigment are included in at least 50% by weight or more of the whole pigments. The infrared reflective intaglio ink composition according to claim 1, wherein the filler is calcium carbonate, barium sulfate, talc, or silicon dioxide. The infrared reflective intaglio ink composition according to claim 1, wherein the varnish is a hydrophobic intaglio varnish or a hydrophobic gel varnish. A method according to any one of claims 1 to 5, wherein the ink composition having an infrared reflecting ability is used for a part of banknotes, various securities and other intaglio printing products together with an ink composition having an infrared absorbing capability.