KR100568610B1 - Thermochromic ink comprising functional materials and the use thereof - Google Patents

Abstract

The present invention relates to a thermochromic ink using a functional material and a method of using the same, and more particularly, a thermochromic ink containing a thermochromic material, an invisible fluorescent substance, and a benzophenone substance, and securities, ID, and security thereof. The present invention relates to a method used to prevent forgery and alteration of a secret document, for example. Products manufactured according to the present invention, the thermal color change ink application pattern is changed from red to colorless in printed matter, red to yellow light emitted by ultraviolet irradiation, the color of the thermal color change ink application pattern in the color output does not discolor, fluorescent Since the intrinsic color does not emit light, the fact of forgery and alteration can be easily confirmed by visual identification or device identification.

Functional substance, thermochromic substance, thermochromic ink, invisible fluorescent substance, benzophenone substance, anti-falsification, varnish, supplement

Description

Thermochromic inks using functional materials and methods of using the same

    1 is a process flowchart showing a method of manufacturing a thermochromic ink using a functional material according to the present invention.

    2 is a cross-sectional view showing a mixed state of a thermochromic material, an invisible fluorescent substance, a benzophenone substance and a varnish as a functional substance according to the present invention.

    3 is a cross-sectional view illustrating a functional thermochromic ink prepared by adding an auxiliary agent to the thermochromic ink of FIG. 2.

    * Description of the symbols for the main parts of the drawings *

     10: thermochromic material 20: invisible fluorescent material

     30: benzophenone substance 40 (a): varnish

     40 (b): Varnish containing auxiliaries (petroleum high boiling point solvent, desiccant)

The present invention relates to a thermochromic ink using a functional material and a method of using the same, and more particularly, a thermochromic ink containing a thermochromic material, a benzophenone material and an optionally invisible fluorescent material, and a securities, ID card, The present invention relates to a method used to prevent forgery and forgery in secret documents for security purposes.

Conventionally, various special elements have been used to prevent forgery and alteration of securities, IDs, and secret documents that require security.However, securities, ID cards, secret documents, etc. can be used as color printers (copiers, printers, etc.). By copying forgery using), it is difficult for an expert to identify the authenticity.

Various methods have been researched and developed to prevent such forgery and alteration. For example, a pattern other than latent images and latent images such as " invalid " Prints by dividing the print into large dots and small dots, so that the large dots are reproduced at the time of copying by using the difference between them, but the small dots are lost. There is a technology that can distinguish prints and copies by the appearance of wave patterns caused by light interference. Such anti-counterfeiting technologies such as flatbed latent image and optical interference technology have been known to use various special elements as a way to prevent forgery and forgery in securities, ID cards, secret documents, and the like.

In addition, Korean Patent No. 104762 describes a method of manufacturing anti-counterfeiting paper by latent image display, but recently, the security effect is improved by using computer graphics when applied to securities and security papers as the reproducibility of computer peripherals is improved. There is a problem in that the copy counterfeit prevention function is insufficient by adjusting the output so that it does not appear.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to visually distinguish the thermochromic material having color development by heat as a countermeasure method of forgery and modulation, or to make the invisible fluorescent material and benzophenone material The present invention provides a thermochromic ink which can be distinguished by an ultraviolet light source, and which is easy to identify forgery and alteration.

Another object of the present invention is to provide a forgery and forgery prevention paper such as securities, identification cards, and special documents for security purposes manufactured using the above-described thermochromic ink.

In order to achieve the above object, in the first aspect, the present invention provides 20 to 30% by weight of thermochromic material, 3 to 7% by weight of invisible fluorescent material, 5 to 10% by weight of benzophenone material, 40 to 60% by weight of varnish, and petroleum. An infectious discoloration ink containing 3 to 7% by weight of a high boiling point solvent and 0.2 to 1% by weight of a desiccant is provided.

In a second aspect, the present invention provides 20 to 30% by weight of thermochromic material, 5 to 10% by weight of benzophenone material, 40 to 60% by weight of varnish, 3 to 7% by weight of petroleum high boiling point solvent and 0.2 to 1% by weight of desiccant. It provides a thermochromic ink containing.

In such embodiments, the thermochromic ink of the present invention is colorless when the specific color of the thermochromic material is heated (40 ° C.) and is visually distinguishable, and the fluorescent material emits light differently when irradiated with ultraviolet light. It is a thermochromic ink that can be identified by an ultraviolet light source, and does not appear to be discolored by heat when radiated by a color output device (copier, printer), and does not emit a specific color when irradiated with ultraviolet light. It is easy to identify the authenticity.

That is, the thermochromic material used herein refers to a material that changes color from color to color when heat is applied. Thermochromic materials that can be used in the present invention include, but are not limited to, chameleon-T black, green, violet, blue, red, orange, and the like, which can be adjusted in a temperature range of 7 ° C to 65 ° C.

Another functional material, an invisible fluorescent material, refers to any material that emits light at a specific wavelength of ultraviolet rays (long wave 365 nm, short wave 235 nm). Specific examples are selected from the group consisting of LUMILUX CD 702, 704, but are not limited thereto.

On the other hand, thermochromic ink should be used selectively according to the purpose. In other words, when using non-fluorescent paper such as securities, thermochromic ink with fluorescent function should be selected. On the other hand, secret white paper for security purposes is used as plain white paper, so the fluorescent color is applied to the paper itself. The addition of the fluorescence function to the ink does not produce a fluorescence effect, so it should be selected selectively.

As the sunscreen, a benzophenone material for improving the light resistance of the thermochromic material may be manufactured by a person skilled in the art or commercially available products such as Ciba TINUVIN-P, TINUVIN-5411, and the like. It is not.

The thermochromic material, invisible fluorescent material and benzophenone material have the following functions depending on the mixing ratio.

When using less than 20% by weight of chameleon-T orange, which is a thermochromic material, to produce a flat or sliding ink, there is a problem in that the thermal discoloration effect due to heat is insufficient. In this case, there is a problem in that the flatness printability is insufficient.

In addition, in the case of using less than 3% by weight of Lumilux CD702, which is an invisible fluorescent material, there is a problem in that the green light emitting effect is insufficient when irradiated with ultraviolet rays, and in the case of more than 7% by weight, plate printability is insufficient. there is a problem.

In addition, when using Ciba TINUVIN-P as the benzophenone material in less than 5% by weight, there is a problem in that the light resistance of the thermochromic material is insufficient, and when it exceeds 10% by weight, the luminous effect of the fluorescent material There is a problem in that deterioration and plate printability effects are insufficient.

The thermochromic ink manufactured by the thermochromic material, the invisible fluorescent material and the benzophenone material added in this way is applied to the securities, ID card, security document, etc. in a specific pattern. It does not appear to be discolored by the color, and the specific color does not emit light when irradiated with ultraviolet light, it is possible to prevent forgery and alteration caused by the visible and the device in advance.

1 is a process flow diagram showing the step of producing a thermochromic ink using a functional material according to the present invention.

As shown in FIG. 1, the thermal discoloration ink according to the present invention has a ratio of emitting light at a special wavelength (long wave, short wave) of the thermochromic material 10 and ultraviolet light, in which a specific color is colorless as shown in FIG. 2 when heat (40 ° C.) is applied. When the benzophenone substance 30 which improves light resistance to the fluorescent substance 20 is mixed with the varnish 40a or the varnish 40b in which a petroleum-based high boiling point solvent and a cobalt dryer are mixed as shown in FIG. Are manufactured.

The varnishes, petroleum-based high boiling point solvents, and drying agents to be mixed when preparing the thermochromic ink will be briefly described.

Looking at the conventional method for producing varnishes, in particular flat varnishes for producing flat ink used in the present invention, an initial condensation product of a phenol resin is obtained from, but not limited to, P-alkyl phenol resin or bisphenol A and formaldehyde. After reacting with the rosin, the methylol group of the phenol resin is reacted with the double bond portion of the rosin, and then the carboxyl group of this resin is esterified in a polyol such as glycerin or pentaerythritol to prepare a rosin-modified phenolic resin. It is prepared by dissolving in alkyd resin, hydrocarbon solvent and the like. When the content of the varnish is less than 40% by weight, the print ink manufacturing aptitude is insufficient, and when the content of the varnish exceeds 60% by weight, the printability is insufficient.

When less than 3% by weight of petroleum-based high boiling point solvent is added, ink transferability is insufficient when printing, and when the amount is higher than 7% by weight, ink sticks to the non-flammable part of the printing plate, bleeding lines on the printed matter, and ink fluffing. This will occur.

In addition, the desiccant used in the present invention includes a cobalt dryer, when the addition of less than 0.2% by weight is a late drying occurs during printing, and the addition of more than 1% by weight drying the ink during printing Is quickly dried and the printing area is not printed accurately.

In a second aspect, the present invention provides a method for producing a thermochromic ink comprising mixing and dispersing a varnish, a petroleum-based high boiling point solvent, and a drying agent in the above-described thermochromic material, invisible fluorescent material, and benzophenone material. do.

In a third aspect, the present invention provides a photochromic ink according to the present invention, manufactured by such a method, under the naked eye or an ultraviolet light source, which is applied to securities, identification cards, security papers for security purposes, etc. using a flat printing plate. Provides forgery and forgery identification paper that can be easily identified.

The final products thus obtained do not have the function of discoloration by heat when they are copied by color output devices (copiers, printers), and the fluorescent material does not emit light when irradiated with UV light, making it easy to visually check forgery or forgery through the device. have.

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

Example 1

<Step 1>

In the presence of 20 to 30 g of zinc chloride, a mixture of 10 to 35 g of benzonitrile and 20 to 30 g of resorcinool is dissolved in an ether solvent and 100 g of water is added to a product obtained by passing the raw material through a dry hydrogen chloride gas, followed by hydrolysis. A type benzophenone material was prepared. At this time, the reaction is shown in Scheme 1 below.

<Step 2>

20-30 g of P-alkyl phenol resin and 40-70 g of formaldehyde are mixed to prepare an initial condensate of phenol resin, which is reacted with 20-40 g of rosin, and then esterified in glycerin to produce rosin-modified phenolic resin. It was dissolved in linseed oil to prepare a varnish for flat and slab.

<Step 3>

5% by weight of benzophenone material prepared in the first step, 58% by weight of varnish for flat and slab prepared in the second step, 26% by weight of chamoleon-T orange, thermoluminescent substance, 4% by weight of Lumilux CD 702, high aliphatic point 6.8 wt% of solvent and 0.2 wt% of cobalt dryer were mixed to disperse and grind 5-6 times with a 3 roll mill to prepare a thermochromic ink. The physical properties of the ink thus prepared are as follows.

* Flow rate φ㎝ (25 ℃, 1min): 7.5 ~ 9.0 (*** For flow rate measurement, connect the constant temperature water tank using Toyoseiki's Spread-O-meter and compare the flow of printing ink at 25 ℃ ***)

* Tack (Tack, 32 ℃, 50m / min): 4.5 ~ 6.0 (*** Tack-o-Scope was used at 32 ℃ and the ink amount was precisely 0.5cc with ink pipette, so the rotation speed was 50m. measured at / min ***)

* Drying time: 40 ~ 50 hours

<Step 4>

The thermal discoloration ink prepared above is applied to securities, ID cards, and secret documents for security purposes by using a flat printing system. The final products thus obtained do not have the function of discoloration by heat when they are copied by color output devices (copiers, printers), and the fluorescent material does not emit light when irradiated with UV light, making it easy to visually check forgery or forgery through the device. there was.

Example 2

<Step 1>

In the presence of 20 to 30 g of zinc chloride, a mixture of 10 to 35 g of benzonitrile and 20 to 30 g of resorcinool is dissolved in an ether solvent and 100 g of water is added to the product obtained by passing the raw material through dry hydrogen chloride gas to give oxidation. A type benzophenone material was prepared. At this time, the reaction is shown in Scheme 1 below.

Scheme 1

<Step 2>

20-30 g of P-alkyl phenol resin and 40-70 g of formaldehyde are mixed to prepare an initial condensate of phenol resin, which is reacted with 20-40 g of rosin, and then esterified in glycerin to produce rosin-modified phenolic resin. It was dissolved in linseed oil to prepare a varnish for flat and slab.

<Step 3>

5% by weight of benzophenone substance prepared in the first step, 60% by weight of varnish for flat and slab prepared in the second process, 28% by weight of thermochromic substance chameleon-T orange, 6.8% by weight of aliphatic high boiling point solvent, cobalt dryer 0.2 Mixing the weight percent by weight 5-6 times in a three roll mill (3 Roll Mill) to produce a thermochromic ink. The physical properties of the ink thus prepared are as follows.

* Flow rate φ㎝ (25 ℃, 1min): 7.5∼9.0 (*** Flow rate measurement is connected to constant temperature water tank using Toyoseiki's Spread-O-meter. Comparative measurement ***.

* Tack (Tack, 32 ℃, 50m / min): 4.5 ~ 6.0 (*** Tack-o-Scope was used at 32 ℃ and the ink amount was precisely 0.5cc with ink pipette, so the rotation speed was 50m. measured at / min ***)

* Drying time: 40 ~ 50 hours

<Step 4>

The thermal discoloration ink prepared above is applied to securities, ID cards, and secret documents for security purposes by using a flat printing system. The final products thus obtained did not show the function of discoloration due to heat when copying by color printers (copiers, printers), making it easy to visually check forgery and forgery.

As can be seen through the above embodiment, when the thermochromic ink according to the present invention is applied, a function of discoloring by heat (40 ° C.) is observed when a color output device (copier, printer) is used for forgery and modulation. In addition, since the fluorescent material does not emit light when irradiated with ultraviolet light, whether or not forgery can be easily confirmed through visual or device. In addition, it is easy to check forgery and alteration by improving light resistance and flat plate printability.

Claims (7)

20-30 wt% of thermochromic material, 3-7 wt% of invisible fluorescent substance, 5-10 wt% of benzophenone substance, 40-60 wt% of varnish, 3-7 wt% of petroleum high boiling point solvent and 0.2-1 of desiccant A thermochromic ink comprising a weight percent. 20 to 30% by weight of thermochromic material, 5 to 10% by weight of benzophenone material, 40 to 60% by weight of varnish, 3 to 7% by weight of petroleum high boiling point solvent and 0.2 to 1% by weight of drying agent Discoloration ink. The thermochromic ink according to claim 1, wherein the invisible fluorescent material is selected from the group consisting of LUMILUX CD 702 and 704. The thermochromic ink according to claim 1 or 2, wherein the thermochromic material is selected from the group consisting of Chameleon-T black, green, violet, blue, red and orange. 20 to 30% by weight of thermochromic material, 3 to 7% by weight of invisible fluorescent material, 5 to 10% by weight of benzophenone material, 40 to 60% by weight of varnish, 3 to 7% by weight of petroleum high boiling point solvent and 0.2 to 2% of drying agent Method for producing a thermochromic ink comprising mixing and dispersing 1% by weight. 20-30% by weight of thermochromic substance, 5-10% by weight of benzophenone substance, 40-60% by weight of varnish, 3-7% by weight of petroleum high boiling point solvent and 0.2-1% by weight of drying agent Method for producing a thermochromic ink containing. The forgery and alteration that can be easily identified under the naked eye or ultraviolet light source by applying the thermochromic ink according to claim 1 or 2 to a security paper for securities, identification card, security, etc. Identification paper.

Images