KR101073375B1 - Offset printing ink for security printing with machine readable features - Google Patents

Abstract

The present invention relates to a flat printing ink for security printing, including device sensing elements used in various security printing products such as banknotes, securities, identification cards.

In more detail, a double-sided multi-color printing has a device sensing element, including a pigment having an optical characteristic that is excited by electromagnetic waves (infrared rays and ultraviolet rays) in a specific wavelength range and emits visible light to prevent forgery and tampering of the product. It is possible, and relates to a flatbed ink for secure printing including a device sensing element capable of a high-speed flatbed printing machine.

Flatbed ink for secure printing including the device sensing element manufactured in accordance with the present invention is excellent in printability, it is possible to print through a high-speed flatbed printing machine, ultraviolet (230 ~ 380nm) or near infrared (920 ~ 1100nm) Is excited by electromagnetic waves and emits light in the visible region. Therefore, the security printing flat plate ink including the device sensing element according to the present invention can be usefully used for various security printing products such as banknotes, securities, identification cards.

Ink, Security, Forgery, Modulation, Infrared (UV), Ultraviolet (IR), Visible, Fluorescent

Description

Offset printing ink for security printing with machine readable features

The present invention relates to a flat printing ink for security printing, including device sensing elements used in various security printing products such as banknotes, securities, identification cards.

In more detail, a double-sided multi-color printing has a device sensing element, including a pigment having an optical characteristic that is excited by electromagnetic waves (infrared rays and ultraviolet rays) in a specific wavelength range and emits visible light to prevent forgery and tampering of the product. It is possible, and relates to a flatbed ink for secure printing including a device sensing element capable of a high-speed flatbed printing machine.

There are various security methods to prevent forgery of various IDs, bank notes, and securities, etc., but the most widely used are security printing inks which are irradiated with a specific range of wavelengths and are excited thereby to emit visible light.

Until now, flat ink for printing security products, including banknotes, has been given only one function to one type of ink, and generally has a characteristic of emitting visible light when irradiated with ultraviolet rays.

However, better anti-forgery effect can be obtained by applying not only ultraviolet excitation but also excitation from infrared rays or excitation by light of different wavelengths to display different emission colors.

In addition, it is possible to have excellent printability and printing effect in an indirect printing method of dry flat printing in which ink is buried in the line of the plate through the ink transfer rollers in the ink collection, and the ink transferred from the plate to the blanket is printed on the printed object. Maintain physical properties.

In the related art, forgery-inhibiting dichroic fluorescent ink using the fluorescent material of the present applicant filed No. 10-2004-0060395, and infrared fluorescent ink composition of the publication number 10-2003-0058350 are proposed. In addition, various technologies such as ultraviolet light emitting ink of Patent Registration No. 0744351 and a security device using the same have been proposed.

The above-mentioned dichroic fluorescent ink for preventing forgery and alteration using the fluorescent material of Publication No. 10-2004-0060395 covers the contents of fluorescent inks showing two emission colors (dual emission) by ultraviolet rays of different wavelengths. The composition has a disadvantage in that it is excited in the infrared region and does not have a function of emitting visible light, and has a limitation in the input ratio of two materials having different excitation wavelengths.

The infrared fluorescent ink composition of Publication No. 2003-0058350 covers a fluorescent ink composition that emits visible light by infrared rays, but this is different from the present invention because it is not a suitable technology for flat printing.

The UV-emitting ink of No. 0744351 and the security device using the same relate to an ink which emits visible light by ultraviolet rays, and is composed of a binder, a quantum dot, and a dispersant, which is transparent in natural light and emits light in a specific range of ultraviolet rays. The elements differ from the present invention.

The present invention solves the limitations and problems of the prior art and proposes a new security printing flat ink which emits light in response to a specific wavelength range of electromagnetic waves as a device sensing element for preventing forgery and alteration.

Accordingly, an object of the present invention is to provide a fluorescent ink composition for printing a flat plate having not only excellent printability but also improved anti-falsification function.

That is, to provide a fluorescent ink that is excited by the energy of the ultraviolet wavelength to emit energy of the visible wavelength, an ink that is excited by the infrared wavelength to emit energy of the visible wavelength, and a fluorescent ink having all of these characteristics.

In order to achieve the above object, the security printing plate ink including the device detecting element of the present invention is a high-speed dry flat printing ink capable of double-sided or sequential multicolor printing, and is excited by infrared rays in the range of 920 to 1000 nm to emit visible light. 60-75 weight% of varnish which is rosin modified phenol resin, 10-20 weight% of coloring agents, 5-20 weight% of IR fluorescent substance, 7-15 weight% of high boiling point aliphatic solvent, and 2-4 weight% of surfactant It consists of 0.2-2 weight% of viscosity, a talc regulator, and 0.2-1 weight% of a drying agent.

Or 60-75 weight% of varnishes which are rosin modified phenol resins to be excited by ultraviolet-ray of 230-380 nm wavelength range, infrared rays of 920-1000 nm wavelength range, and emit visible light, 10-20 weight% of coloring agents, and UV 10 to 25% by weight of the mixed fluorescent material mixed with the fluorescent material and the IR fluorescent material, 7 to 15% by weight of the high boiling point aliphatic solvent, 2 to 4% by weight of the surfactant, 0.2 to 2% by weight of the viscosity and talc regulator, It consists of 0.2-1 weight% of a desiccant.

Or 60-75 weight% of varnishes which are rosin modified phenol resins, 10-20 weight% of coloring agents, 5-20 weight% of UV fluorescent materials, and high ratio so that they may be excited by ultraviolet-ray of 230-380 nm wavelength range, and emit visible light It consists of 7-15 weight% of viscous aliphatic solvents, 2-4 weight% of surfactants, 0.2-2 weight% of a viscosity and a tack regulator, and 0.2-1 weight% of a drying agent.

The IR fluorescent substance is an invisible rare earth metal compound containing any one or two of yttrium, erbium and ytterbium,

The UV fluorescent substance consists of any one or two of rare earth complexes, benzoxazinone derivatives, salicylic acid derivatives, and oxynates.

The flat printing ink for the security printing including the device sensing element of the present invention made of the various as described above can apply a fluorescent ink that emits visible light by ultraviolet and infrared to various security prints, including banknotes and securities, the printability of the It is suitable for high-speed flatbed printing that enables simultaneous double-sided or sequential multicolor printing.

It will be described in detail a preferred embodiment of the present invention. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Accordingly, the embodiments and configurations described herein are only exemplary embodiments of the present invention, and do not represent all of the technical ideas of the present invention, and various equivalents and modifications that may substitute them at the time of the present application may be made. It should be understood that there may be examples.

The present invention is a flat plate capable of emitting visible light by electromagnetic energy in the ultraviolet region or the infrared region, capable of simultaneously printing on both sides or sequential multicolor printing, and having a printability applicable to a high speed flatbed printing machine capable of printing 9,000 to 10,000 sheets per hour. It relates to printing ink.

Conventional flat printing ink compositions are basically from 63 to 85% by weight of varnish, 4 to 25% by weight of colorant, 5 to 15% by weight of high boiling point aliphatic solvent, 0.2 to 2% by weight of viscosity and talc regulator, 0.2 to 1% by weight of desiccant, It consists of 2-4 weight% of surfactant.

The present invention is to add a fluorescent material in order to add a security function by emitting visible light by electromagnetic energy of the characteristic ultraviolet region or infrared region, security printing ink containing the fluorescent material 60 to 75% by weight varnish, 10 ~ 20 wt%, 5-25 wt% fluorescent substance, 7-15 wt% high boiling point aliphatic solvent, 0.2-2 wt% viscosity and talc regulator, 0.2-1 wt% desiccant, 2-4 wt% surfactant.

The varnish generally uses a rosin-modified phenolic resin, preferably 60 to 75% by weight.

When the content of the varnish is insufficient, fluidity and transferability are lowered, and when the content is excessive, the printability is reduced. Therefore, high viscosity varnishes with different viscosity ranges and low viscosity varnishes with 600-1000 poise can be used in combination (mixing) in order to properly adjust the fluidity of ink for the purpose of proper ink transfer, fine line reproduction, and prevention of brim on the printing press. It is possible to use, and at the same time apply a talc regulator based on aluminum stearate.

The colorant is mainly a colored organic pigment is used in consideration of the concentration of the printed matter, the fluidity of the ink, etc. 10 to 20% by weight level is suitable.

When the colorant is less than 10% by weight, problems such as a decrease in concentration of the printed matter and bleeding due to excessive fluidity of the ink may occur, and when the colorant exceeds 20% by weight, the printability may deteriorate due to excessive absorption of the pigment.

In the case of the fluorescent material, the content should be determined in consideration of the area of the printing portion, the thickness of the ink layer, and the resulting luminous intensity and durability.

When the content of the fluorescent material is 5% by weight or less, the luminous efficiency is not good, and thus the function to be pursued is not performed, and when 20% by weight or more, the fluidity and printability of the ink are adversely affected.

The fluorescent material may be used by mixing or mixing UV (ultraviolet) fluorescent materials and IR (infrared) fluorescent materials, respectively.

That is, UV fluorescent materials are used to emit visible light only in a specific range of ultraviolet light, IR fluorescent materials are used to emit visible light only in a specific range of infrared light, or visible light is emitted in a specific range of UV light and infrared light. UV fluorescent material and IR fluorescent material should be mixed to use.

The surfactant is to increase the color development and dispersibility of the pigment and to improve the fluidity of the ink, and a polymer dispersant is usually used.

The desiccant uses a mixture of metal salts such as cobalt, manganese and zirconium and a petroleum solvent, and an aliphatic solvent having a boiling point range of 290 to 340 ° C.

In the case of flat-panel inks for high-speed flatbed printers that emit visible light by ultraviolet (UV) irradiation, the printed matter of the ink is visually visible on visible light (natural light) by mixing with colored pigment (pigment) or by using a fluorescent material alone. It can not be checked, but can be used as a forgery prevention element that can be visually identified or detected by the device through fluorescence emission by ultraviolet rays.

In addition, by mixing a fluorescent material excited in a short wavelength ultraviolet (230 ~ 280nm) and a fluorescent material excited in a long wavelength ultraviolet (340 ~ 380nm) it can be prepared a fluorescent ink in which the emission color is different in the long wavelength ultraviolet and short wavelength ultraviolet light respectively. .

Fluorescent materials that can be used are representative of Honeywell's fluorescent pigment family such as rare earth complexes, benzoxazinone derivatives, salicylic acid derivatives, and oxynates.

Selecting and using them can produce flat ink having excitation in the ultraviolet region (230 to 380 nm) and having a light emission wavelength of 500 to 550 nm or a light emission wavelength of 600 to 650 nm.

In particular, dual emitting fluorescent inks having different emission wavelengths may be manufactured by dividing the excitation wavelength under long-wavelength ultraviolet rays and short-wavelength ultraviolet rays by mixing fluorescent materials having a maximum excitation wavelength of 80 to 100 nm or more. .

At this time, the content of the fluorescent material is 5 to 20% by weight is suitable as described above, and the mixing ratio of the two fluorescent materials and the respective light emission intensity shows a result that there is no particular restriction on the mixing ratio.

In the case of a flat plate ink for a high-speed flatbed printer that emits visible light by infrared irradiation, it is not possible to check whether a print of the ink has fluorescence property in visible light (natural light) by visually mixing the colored colorant or using a fluorescent material alone. It can be used as a forgery prevention element that can be visually identified or device detected through fluorescence emission by light.

Materials usable for this include metal compounds (typically from Honeywell) including yttrium, erbium, ytterbium and the like.

By using this, a flat plate ink having an emission wavelength of 520 to 580 nm is excited by the infrared region (920 to 1000 nm).

At this time, the content of the fluorescent material is 5 to 20% by weight is suitable as described above, and 10 to 15% by weight is advantageous for more effective emission signal detection and printability.

The differentiation of the excitation wavelength through the mixing of infrared (IR) excited fluorescent materials and ultraviolet (UV) excited fluorescent materials is also possible.

For example,

First, when the flat ink composition is prepared by mixing a rare earth metal compound excited by infrared light (IR) and a UV fluorescent material (pigment) that is excited by ultraviolet light (UV) and has a light emission wavelength of 500 to 550 nm. By the ultraviolet (UV) and infrared (IR) irradiation of the range it becomes the characteristic that emits green light,

Second, when the flat ink composition is prepared by mixing a rare earth metal compound excited by infrared light (IR) and a fluorescent pigment excited with ultraviolet light (UV) and having a light emission wavelength of 600 to 650 nm, the ultraviolet light of a specific wavelength range ( UV) exhibits the property of emitting red light and emitting green light by infrared irradiation in a specific wavelength range (920 to 1000 nm).

In this manner, in addition to the fluorescence characteristics of ultraviolet light excitation, visible light emission characteristics by infrared excitation can be added to enable more effective and powerful anti-counterfeiting element and device sensing element.

Hereinafter, according to the present invention as in the embodiment, a security printing plate ink including a device sensing element was manufactured.

Example 1

Among the varnishes, which are rosin-modified phenolic resins, 21 wt% of high-viscosity varnishes (using Dongyang Ink DV-116), 46 wt% of low-viscosity varnishes (using Dongyang Ink DV-130), and excitation in the infrared range are visible light in the 520-580 nm wavelength range. 8% by weight of a rare earth metal compound (using Honeywell's LUMILUX Green UC2 (rare earth oxysulfide)) and 13% by weight of a colored pigment (coloring agent) are mixed and stirred,

On a three-roll mill (3rd mill), 8% by weight of the high boiling point aliphatic solvent, 3% by weight of the dispersant, 0.9% by weight of the tack regulator, and 0.1% by weight of the cobalt desiccant were further mixed and ground for 5 times to remove the visible light. A flat printing ink for security printing including a device sensing element having color and emitting green light under infrared light was prepared.

The ink thus prepared is a talc of 170 to 280 (TU, measuring temperature 25 ° C., roller speed 100 m / min) and a viscosity of 20 to 45 (Pa · s, measuring temperature 25 ° C., shear strain 400 s ⁻¹ ), 25 to 50 It has a drying time of time.

[Example 2]

Among the varnishes, which are rosin-modified phenolic resins, 18% by weight of high-viscosity varnish (using Dongyang Ink DV-116) and 44% by weight of low-viscosity varnish (using Dongyang Ink DV-130), and rare earth metal compounds which are excited in the infrared region to emit visible light ( 6% by weight of Honeywell's LUMILUX Green UC2 (rare earth oxysulfide), 7% by weight of a fluorescent material (using Honeywell's LUMILUX CD740) having a light emission wavelength of 600-650 nm excited in the ultraviolet region, and a colored pigment (coloring material) 13% by weight of the mixture is stirred and

On a 3-roll mill (3rd mill), 8.3 wt% of the high-boiling aliphatic solvent, 3 wt% of the dispersant, 0.6 wt% of the tack regulator, and 0.1 wt% of the cobalt desiccant were further mixed and ground for 5 times, followed by visible light. A flat printing ink for security printing containing a device sensing element having color and red light emission under ultraviolet light and green light emission under infrared light was prepared.

The ink thus prepared is a talc of 170 to 280 (TU, measuring temperature 25 ° C., roller speed 100 m / min) and a viscosity of 20 to 45 (Pa · s, measuring temperature 25 ° C., shear strain 400 s ⁻¹ ), 25 to 50 It has a drying time of time.

Example 3

Among the varnishes, which are rosin-modified phenolic resins, organic compounds having a light emission wavelength of 600 to 650 nm by being excited in the ultraviolet region to 19 weight% of high viscosity varnish (using Dongyang Ink DV-116) and 45 weight% of low viscosity varnish (using Dongyang Ink DV-130). 6 wt% of a fluorescent material (using Honeywell's LUMILUX CD761), 6 wt% of a fluorescent material (using Honeywell's LUMILUX CD702), and 12% by weight of a colored pigment were mixed and stirred,

7.9% by weight of the high-boiling aliphatic solvent, 3% by weight of the dispersant, 1% by weight of the tack regulator, and 0.1% by weight of the cobalt desiccant were further mixed on a 3-roll mill (mild machine), and ground five times. A flat printing ink for security printing containing a device sensing element having color and emitting green light under long wavelength ultraviolet light and red light under short wavelength ultraviolet light was prepared.

The ink thus prepared is a talc of 170 to 280 (TU, measuring temperature 25 ° C., roller speed 100 m / min) and a viscosity of 20 to 45 (Pa · s, measuring temperature 25 ° C., shear strain 400 s ⁻¹ ), 25 to 50 It has a drying time of time.

Example 4

Among the rosin-modified phenolic resin varnishes, 20 wt% of high viscosity varnish (using Dongyang Ink DV-116) and 45 wt% of low viscosity varnish (using Dongyang Ink DV-130) are fluorescent materials having a light emission wavelength of 500-550 nm (Honeywell) 9% by weight of LUMILUX CD394) and 14% by weight of colored pigment are mixed and stirred,

On a three-roll mill (3rd mill), 8 wt% of the high boiling point aliphatic solvent, 3.2 wt% of the dispersant, 0.7 wt% of the tack regulator, and 0.1 wt% of the cobalt desiccant were further mixed and ground for 5 times, and then, under visible light. A flat printing ink for security printing containing a device sensing element having color and emitting green light under ultraviolet rays was prepared.

The ink thus prepared is a talc of 170 to 280 (TU, measuring temperature 25 ° C., roller speed 100 m / min) and a viscosity of 20 to 45 (Pa · s, measuring temperature 25 ° C., shear strain 400 s ⁻¹ ), 25 to 50 It has a drying time of time.

Example 5

Fluorescence having a light emission wavelength of 600 to 650 nm by excitation in the ultraviolet region to 19% by weight of high viscosity varnish (using Dongyang Ink DV-116) and 45% by weight of low viscosity varnish (using Dongyang Ink DV-130) among varnishes, which are rosin-modified phenolic resins. 12% by weight of the substance (using Honeywell's LUMILUX CD777) and 12% by weight of the colored pigment are mixed and stirred,

On a 3-roll mill, a 9-wt% high-boiling aliphatic solvent, 3.1 wt% dispersant, 0.8 wt% talc regulator and 0.1 wt% cobalt desiccant were further blended and ground for 5 times to remove the visible light. A flat printing ink for security printing containing a device sensing element having color and emitting red light under ultraviolet rays was prepared.

The ink thus prepared is a talc of 170 to 280 (TU, measuring temperature 25 ° C., roller speed 100 m / min) and a viscosity of 20 to 45 (Pa · s, measuring temperature 25 ° C., shear strain 400 s ⁻¹ ), 25 to It has a drying time of 50 hours.

Example 6

Rare earth metal compound (Honeywell) that excites in the infrared region to 18% by weight of high viscosity varnish (using Dongyang Ink DV-116) and 43% by weight of low viscosity varnish (using Dongyang Ink DV-130) among varnishes that are rosin-modified phenolic resins (Honeywell 6% by weight of LUMILUX Green UC2), 9% by weight of a fluorescent material (using Honeywell's LUMILUX CD777) having an emission wavelength of 600 to 650 nm excited in the ultraviolet region, and a fluorescent water having a light emission wavelength of 500 to 550 nm (Honeywell) 4% by weight of LUMILUX CD702 and 10% by weight of colored pigment are mixed and stirred,

On a 3-roll mill (grinder), 7% by weight of the high-boiling aliphatic solvent, 2% by weight of the dispersant, 0.9% by weight of the tack regulator, and 0.1% by weight of the cobalt desiccant were further ground for 5 times, and then under visible light. A flat printing ink for security printing including a device sensing element having color and emitting green and red light according to ultraviolet irradiation wavelength and emitting green light under infrared light was prepared.

The ink thus prepared is a talc of 170 to 280 (TU, measuring temperature 25 ° C., roller speed 100 m / min) and a viscosity of 20 to 45 (Pa · s, measuring temperature 25 ° C., shear strain 400 s ⁻¹ ), 25 to 50 It has a drying time of time.

Claims (10)

In the flat printing ink, It is made by mixing high viscosity varnish of 1400 ~ 2000poise and low viscosity varnish of 600 ~ 1000poise, but it is 60 ~ 72% by weight of varnish which is rosin modified phenol resin composed of 3 high viscosity varnish to low viscosity varnish 7, and 10 ~ 20% by weight of coloring material. 10 to 22% by weight of the mixed fluorescent material mixed with the UV fluorescent material and the IR fluorescent material, 7 to 15% by weight of the high-boiling aliphatic solvent, 0.2 to 2% by weight of the viscosity and talc adjusting agent, and 0.2 to 1% by weight of the drying agent. Consists of, The IR fluorescent material is an invisible rare earth metal compound containing any one or two or more of yttrium, erbium, and ytterbium, and the UV fluorescent material is a mixture of two rare earth complexes, benzoxazinone derivatives, and salicylic acid derivatives. It is excited by ultraviolet rays in the wavelength range of ㎚ and infrared rays in the range of 920 ~ 1000nm to emit visible light, A flatbed ink for secure printing, comprising a machine sensing element, capable of double-sided or sequential multicolor printing and for high speed dry flat printing capable of printing 9,000 to 10,000 sheets per hour. In the flat printing ink, It consists of a mixture of high viscosity varnish of 1400 ~ 2000poise and low viscosity varnish of 600 ~ 1000poise, but it is 60 ~ 75% by weight of varnish which is rosin modified phenol resin composed of 3 high viscosity varnish to low viscosity varnish 7, and 10 ~ 20% by weight of coloring material. And, 5 to 20% by weight of UV fluorescent substance, 7 to 15% by weight of high boiling point aliphatic solvent, 0.2 to 2% by weight of viscosity and talc adjusting agent, and 0.2 to 1% by weight of drying agent, The UV fluorescent material is mixed with two of the rare earth complex, benzoxazinone derivatives, salicylic acid derivatives are excited by ultraviolet light in the wavelength range of 230 ~ 380nm when irradiated with ultraviolet light, to emit visible light, A flatbed ink for secure printing, comprising a machine sensing element, capable of double-sided or sequential multicolor printing and for high speed dry flat printing capable of printing 9,000 to 10,000 sheets per hour. delete delete delete delete delete delete delete delete