KR101119701B1 - Continued color changeable security thread comprising micro optical structure and a method of preparing the same - Google Patents

Abstract

PURPOSE: A continued color changeable security thread is provided to have continuous two or more color change to constant direction according to predetermined movement. CONSTITUTION: A continued color changeable security thread comprises a step of forming an optical micro lens on one side of a base material; a step of forming an intermediate layer having an intaglio groove on the other side of the base material; a step of filling ink including multi-layered pigment having a magnetic layer, and a binder; a step of arranging the multi-layer pigment by magnetic field for displaying predetermined color; and a step of hardening fluid including the multi-layered pigment and the binder.

Description

Continual color changeable security thread comprising micro optical structure and a method of preparing the same}

The present invention relates to a hidden line including a micro-optical structure having two or more color changes continuous in a predetermined direction as a movement, and a method of manufacturing the same.

In general, when manufacturing securities such as banknotes, checks, and securities, a method of manufacturing silver wire by inserting a film to prevent forgery inside the paper is used. Usually, the silver wire is inserted into a paper after being deposited on a plastic transparent film based on a metal material such as aluminum, but is visible in the transmitted light but is not well reflected in the reflected light, and thus is used as a method of forgery or tampering. In addition, black or colored letters or patterns may be printed on transparent plastic films or transparent lines such as transparent letters hidden lines or fluorescent treatments, electric conductivity, magnetic wavelengths, etc. .

The silver line has various visual properties or mechanical properties by including various properties in the film or fiber. For example, the silver line forms a specific micro-pattern, a partial metal layer, and the fluorescence characteristics in response to the character, the insertion of the pattern, and the specific wavelength. Through the use of the material, the optical properties, the use of electromagnetic properties, and the like, the user may imply various levels of security, ranging from sensory functions and identification by devices. The hidden line is a security element used by the user as a tool for determining the authenticity of the security product.

Specifically, the time varying hidden line has a characteristic that the color changes according to the viewing angle. This is a very useful technique and can improve the user's visual judgment in authenticity determination.

Where a large amount of money is handled, such mechanical characteristics are required, and these characteristics may provide more reliable discriminating power by using magnetic, electrical conductivity, and fluorescent characteristics.

In addition, the motion silver line by the micro-optical system is used as a highly secure element as a hidden line providing motion in a direction perpendicular to the viewing direction. The micro-optical system provides a composite optical imaging system comprising an array of focusing elements and an imaging system comprising or formed from a pattern or array of image icon elements. In this case, the image is provided in a single color, which is a problem that lacks the visual variety of security products.

Accordingly, in the present invention, as a result of extensive research in order to solve the above-described needs and the above-mentioned problems, an advanced film which induces two or more color changes according to the movement, can be inserted into a paper and provided as a hidden line. The present invention has been completed based on this.

Hidden lines having two or more continuous color changes including the micro-optical structure according to the present invention for achieving the above object are as follows.

According to one embodiment of the present invention, it may be a hidden line including a micro-optical structure having two or more color changes continuous in a constant direction according to the movement.

According to one embodiment of the invention, forming a micro optical lens layer on one surface of the base substrate; Forming an intermediate layer having an intaglio groove on another surface of the base substrate; Filling an ink including a pigment and a binder having a multi-layer structure having a magnetic layer in a groove of the intermediate layer; Aligning the multilayered pigment by a magnetic field so that a desired color is obtained for the multilayered pigment having the formed magnetic layer; And hardening a fluid including a multilayered structure pigment and a binder having the magnetic layer, thereby producing a hidden line including a micro-optical structure having two or more color changes continuously in a predetermined direction as the movement occurs.

According to one embodiment of the invention, forming a micro optical lens layer on one surface of the base substrate; Forming an intermediate layer on the other surface of the base substrate to match the focal length of the micro optical lens; Printing an ink including a multilayered pigment having a magnetic layer; Aligning the multilayered pigment by a magnetic field so that a desired color is obtained for the multilayered pigment having the formed magnetic layer; And hardening a fluid containing a multilayer structure pigment and a binder having the magnetic layer to produce a hidden line including a micro-optical structure having two or more color changes continuously in a constant direction as the movement is performed.

According to one embodiment of the invention, forming a micro optical lens layer on one surface of the base substrate; Printing an ink including a multilayered pigment having a magnetic layer on the other side of the base substrate; Aligning the multilayered pigment by a magnetic field so that a desired color is obtained for the multilayered pigment having the formed magnetic layer; And hardening a fluid containing a multilayer structure pigment and a binder having the magnetic layer to produce a hidden line including a micro-optical structure having two or more color changes continuously in a constant direction as the movement is performed.

According to one embodiment of the present invention, the ink may include a UV-curable compound, a compound cured through an electron beam, and a compound capable of polymerizing radically or cationicly.

According to one embodiment of the present invention, the size of the multilayer structure pigment having the magnetic layer may be 10 nanometers or more and 2 micrometers or less.

According to one embodiment of the present invention, the multilayer structure pigment having the magnetic layer may be at least one selected from the group consisting of nonmetal inorganic flakes, metal inorganic flakes, and organic flakes.

According to one embodiment of the present invention, the multilayer structure pigment having the magnetic layer may be a plate-like pigment or a capsule pigment.

According to one embodiment of the invention, the binder is an acrylate containing one or more functional groups selected from urethane groups, epoxy groups, glycol groups, hydroxyl groups, polyester groups, ethoxylate groups and propoxylate groups or Methacrylate may be included.

According to an embodiment of the present invention, the ink including the multilayered pigment having the magnetic layer maintains a viscosity of 10 Pa · s or more and less than 100 Pa · s, and has a viscosity of 80% while remaining in a region to which a magnetic field is applied. It may be as decreasing.

According to one embodiment of the present invention, after curing the fluid may further comprise the step of applying a fluorescent material having a fluorescent characteristic.

According to one embodiment of the present invention, it is possible to provide a hidden line including a micro-optical structure having two or more color changes continuous in a constant direction according to the movement made according to the present invention.

The terms or words used in this specification and claims are not to be construed in a conventional, dictionary sense, but the principle that the inventors may appropriately define the concept of terms in order to best describe their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

The silver line manufactured according to the present invention is observed by the enlarged fine image formed in the film by the optical effect of the microlens array structure, and the fine image is moved left and right when the enlarged image is interlocked by moving the hidden line. Two or more colors can be changed continuously while moving, improving the user's visual judgment in authenticity determination.

In addition, this can recognize the movement of the enlarged image more effectively than the effect provided by the optical system by the conventional microlens array structure, and also verify the authenticity in the security product and the product to which the effect is improved. It is more useful than and has the advantage of being rich in color due to color change.

1 is a view showing a black hidden line according to the conventional prior art.
2 is a view showing a blue hidden line according to the conventional prior art.
3 is a view showing a hidden line in which the color is changed to blue and yellow in the width direction of the hidden line according to an embodiment of the present invention.
4 is a view illustrating a hidden line in which the color gradually changes from a red color to a violet color in a longitudinal direction according to an embodiment of the present invention.
FIG. 5 is a view illustrating a hidden line in which color is changed to red and green in the width direction of the hidden line according to one embodiment of the present invention.
6 is a view showing a film on a magnetic field according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 and 2 show that when moving a hidden line with a hidden line provided by the prior art, the image in the hidden line is moved vertically in the direction of the movement of the hidden line, i.e., tilted up and down, left and right, and tilted left and right, the image is moved up and down. These are provided in monochrome.

Therefore, in the present invention, in order to produce a silver line having two or more color changes continuous in a predetermined direction as a movement, an ink including a multilayered pigment and a binder is used.

That is, in the present invention, a micro-optical lens layer is formed on one surface of the base substrate, an intermediate layer having negative grooves is formed on the other surface of the base substrate, and then a pigment and a binder having a multilayer structure having a magnetic layer in the groove of the intermediate layer. Charge the ink containing. Then, the multilayered pigment having the magnetic layer formed may be aligned by the magnetic field so that a desired color appears, and the fluid solution including the multilayered pigment and the binder having the magnetic layer may be cured to prepare a silver wire.

According to another embodiment of the present invention, the present invention is to form a micro-optical lens layer on one surface of the base substrate, in order to produce a silver line having two or more color changes continuous in a predetermined direction as the movement, On the other side of the intermediate layer is formed to match the focal length of the micro-optical lens, and after printing an ink containing a multi-layered pigment having a magnetic layer, the multi-layered pigment having a magnetic layer formed by the magnetic field to produce a desired color The silver wire may be prepared by aligning the multilayered pigment and then curing the fluid containing the multilayered pigment and the binder having the magnetic layer.

In addition, the present invention is to form a micro-optical lens layer on one surface of the base base material, to print an ink containing a multi-layered pigment having a magnetic layer on the other side of the base base material, the desired multilayered pigment having a magnetic layer formed After aligning the multi-layered pigment by a magnetic field so that color appears, the silver liquid may be prepared by curing the fluid containing the multi-layered pigment and the binder having the magnetic layer.

According to one preferred embodiment of the present invention, the ink may include a UV-curing compound, a compound which cures through an electron beam, a polymerization initiator, a monomer, a prepolymer, a monomer and a prepolymer, a radical or cationic polymerizable polymer. have.

According to a preferred embodiment of the present invention, the micro optical lens layer may be a film by an optical system with a microlens array structure. The film may use a regular two dimensional array of lenses to form a composite enlarged image of a fine image, referred to as an icon, through the integrated capabilities of multiple individual lens / icon image systems. For example, the thickness of the film may vary depending on the focal length of the individual lens. Specifically, when the focal length of the microlens is short, the curvature of the lens becomes large, and when the focal length becomes long, the curvature of the lens becomes small. The longer the focal length, the thicker the film, in which case it can be easily distorted or broken when bent or folded in application for the security product and visual improvement effect of the present invention, and the microscopic image must be within the range of the micro lens. Therefore, the size of the fine image should be several tens of nanometers or less, and to form the fine image of this size, photo-lithography, electron beam lithography technique, etching and lift-off method, and nanoimprint lithography may be manufactured.

According to a preferred embodiment of the present invention, the ink that can be applied to the micro-image may be a fluid containing a binder that can induce the orientation of the pigment by providing fluidity with the multilayer structure pigment having a magnetic layer.

According to a preferred embodiment of the present invention, the multilayer structure pigment having a magnetic layer that can be applied to the fine image may be a plate-like pigment or a capsule pigment, the particle size of the magnetic layer may be 10 nanometers or more and 2 micrometers or less. In this case, when the size is less than 10 nanometers, workability is inferior, and when it exceeds 2 micrometers, it is difficult to fill the grooves of the intermediate layer or to make printing difficult.

According to a preferred embodiment of the present invention, the multilayer structure pigment having the magnetic layer may be at least one selected from the group consisting of nonmetal inorganic flakes, metal inorganic flakes, and organic flakes.

According to one embodiment of the present invention, the multilayer structure pigment having the magnetic layer is characterized in that it comprises a material selected from the group consisting of nickel, cobalt, iron, gadolinium, terbium, dysprosium, erbium, and alloys or oxides thereof. Pigment flakes having at least one reflective layer on both the front and back surfaces of the magnetic layer, the reflective layer being aluminum, silver, copper, gold, platinum, tin, titanium, palladium, nickel, cobalt, rhodium, niobium, chromium, and their It may be a color conversion pigment comprising a reflective material selected from the group consisting of combinations or alloys. In addition, the multilayer structure pigment having the magnetic layer may be magnetic particles.

According to one embodiment of the present invention, the binder which can induce the orientation of the pigment by providing the fluidity is a pigment of a multilayer structure having a magnetic layer at the same time having a fluidity that the pigment of a multilayer structure having a magnetic layer can be fully oriented under a magnetic field It should be able to cure rapidly after the orientation of and to fix the pigment. As the curing method, UV curing method, hot air drying, infrared irradiation, radio frequency induction, etc. may be used. More specifically, the UV curing method lowers the viscosity of the fluid by irradiating with light having a wavelength in the range of 200 nm to 420 nm. A composition comprising a photoinitiator, which refers to a non-vinyl compound capable of initiating the polymerization of a compound containing at least one vinyl group by inducing crosslinking of the functional groups of the fluid, and comprising urethane, epoxy, glycol, hydroxyl, polyester Acrylate or methacrylate containing one or more functional groups selected from ethoxylates and propoxylates.

According to one embodiment of the present invention, the ink including the multi-layered pigment having the magnetic layer is required to maintain the proper viscosity in order to facilitate the flow of the pigment, for example, in the temperature range of 18-30 ℃ 100Pa? S It is desirable to maintain a viscosity of less than, less than 10-100 Pa.s, less than 10-90 Pa.s, or less than 20-80 Pa.s. The higher the viscosity, the less sufficient the orientation of the pigment, Because aesthetics can be weakened. In addition, the viscosity of the ink should be reduced when the orientation of the multilayered pigment having the magnetic layer is made, and it is desirable to reduce it by about 80% while staying in the region where the magnetic field is applied, and then finally adhere completely to the film substrate.

According to one embodiment of the present invention, in order to orient the ink composition formed by the fine image by the magnetic field, the design of the bar of the magnetic field is important, which can be applied simultaneously in the horizontal direction, vertical direction, or horizontal direction. For example, some fine images on the film may stand up with a multilayered pigment having a magnetic layer along the magnetic field lines of the magnetic field, while in other fine images the pigment may lie flat, or some flakes may lean flat It may be inclined at varying angles between the lying and standing flakes. This schematic shape is shown in FIG. 6.

According to one embodiment of the present invention, the device for forming a magnetic field may be any device capable of forming a magnetic field, such as a permanent magnet, an electromagnet, the method and means for orienting are all magnetic field formation and An orientation method can be used.

According to one embodiment of the present invention, fluorescence and phosphorescent properties may be additionally applied for additional security. This may be realized through a pigment or dye having the property of being excited by a specific wavelength such as ultraviolet light, visible light, infrared light and emitted at another wavelength. This property may be applied to the ink manufacturing process of the second process or may be formed in a separate layer, but preferably implemented in a separate layer may obtain a more distinct color change. The separate layer can be applied by a printing or coating method. As a specific material of the fluorescent and phosphorescent properties, a material having a characteristic of being excited by an electromagnetic wave having a wavelength of 0.1 nm to 2000 nm and emitted at a wavelength of 200 nm to 2000 nm may be used. Examples of materials having such properties include Honeywell Lumilux® Green RGS-4, Red RGS-4, PHOSPHOR TECHNOLOGY UKL63, UKL65, and the like.

In addition, honeywell Lumilux® CD128, CD116, CD139, PHOSPHOR TECHNOLOGY PTB460, PTG505, PTR625, and Uksung Chemical PANAK 245 include materials that are excited at wavelengths of 200 nm to 400 nm and are emitted at wavelengths of 400 nm to 700 nm.

In addition, a material having a characteristic of being excited at a wavelength of 200 nm to 400 nm and emitted at a wavelength of 700 nm to 1500 nm includes Honeywell Lumilux® CD142, and has an upconversion (antistok) fluorescence characteristic of 700 nm to 1600 nm. Materials that are excited at wavelengths and emitted at wavelengths of 400 nm to 700 nm include Honeywell Lumilux® RED UC-6, PHOSPHOR TECHNOLOGY PTIR475 / F, PTIR545,550 / F, and Uksung Chemical UPC-300.

According to one embodiment of the present invention, the film implemented through this process can be applied as a security element as the film itself, can be used as a hidden line by inserting in the paper, can be applied to a plastic card, passport and the like. In addition, it may be applied after applying the adhesive treatment to the outermost surface of the film in order to adhere to other materials. The adhesive treatment may use solvent-based acrylic and rubber adhesives, hot melt adhesives, and all the adhesion methods that meet the adhesive force requirements of the structure of the present invention.

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

The silver wire applied to the security product used polyester film 15㎛ as the base material, and arranged the microlens structure on one surface, the diameter of the microlenses was 30㎛, and the spacing between the microlenses was 35㎛, which is phenylthioethyl It was prepared using acrylate (PTEA) resin. On the other side, an intermediate layer having a thickness of 10 μm was formed, and a butterfly-shaped pattern was engraved in the middle layer, and the average depth of the formed pattern was 6 μm in relief, and phenylthioethyl acrylate (PTEA) Made of resin. 3 mm of NdFeB magnet 40 MOe of width 50 mm x height 40 mm x length 500 mm after application of an ink containing 20% by weight of a multilayer structure pigment having nickel of about 1 micrometer in the formed relief was applied. After the pigments were oriented in the direction of the magnetic field guided by the magnetic fields installed at intervals, the ink was fixed by using an ultraviolet curing device equipped with a 3000W metal halide lamp and a high pressure mercury lamp. Red and green were repeatedly observed in the width direction of the produced film. In addition, in the enlarged composite image by the microlens array structure, it was observed that the film was changed from red to green as the film was tilted from side to side, which is shown in FIG. 5.

On the other hand, one embodiment of the present invention is not limited to the described embodiments, it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

Claims (11)

Forming a micro optical lens layer on one surface of the base substrate;
Forming an intermediate layer having an intaglio groove on another surface of the base substrate;
Filling an ink including a pigment and a binder having a multi-layer structure having a magnetic layer in a groove of the intermediate layer;
Aligning the multilayered pigment by a magnetic field so that a desired color is obtained for the multilayered pigment having the formed magnetic layer; And
The method for producing a silver wire comprising the step of curing the fluid containing the multilayer structure pigment and the binder having the magnetic layer. Forming a micro optical lens layer on one surface of the base substrate;
Printing an ink including a multilayered pigment having a magnetic layer on the other side of the base substrate;
Aligning the multilayered pigment by a magnetic field so that a desired color is obtained for the multilayered pigment having the formed magnetic layer; And
The method for producing a silver wire comprising the step of curing the fluid containing the multilayer structure pigment and the binder having the magnetic layer. The method according to claim 2,
The method further comprises the step of forming an intermediate layer for adjusting the focal length of the micro-optical lens prior to printing the ink including the multilayered pigment having the magnetic layer. The method according to any one of claims 1 to 3,
The ink is a manufacturing method, characterized in that it further comprises a UV-curing compound, a compound which is cured through an electron beam, a radically polymerizable compound, or a cationic polymerizable compound. The method according to any one of claims 1 to 3,
The multilayered pigment having a magnetic layer has a size of 10 nanometers or more and 2 micrometers or less. The method according to any one of claims 1 to 3,
The multilayered pigment having the magnetic layer is a production method, characterized in that at least one selected from the group consisting of non-metal inorganic flakes, metal inorganic flakes, organic flakes. The method according to any one of claims 1 to 3,
The multilayer structure pigment having the magnetic layer is a manufacturing method, characterized in that the plate-like pigment or capsule pigment. The method according to any one of claims 1 to 3,
The binder comprises an acrylate or methacrylate containing at least one functional group selected from urethane groups, epoxy groups, glycol groups, hydroxyl groups, polyester groups, ethoxylate groups and propoxylate groups. Manufacturing method. The method according to any one of claims 1 to 3,
The ink containing the multilayered pigment having the magnetic layer maintains a viscosity of 10 Pa · s or more and less than 100 Pa · s, and the viscosity decreases by 80% while staying in the region where the magnetic field is applied. . The method according to any one of claims 1 to 3,
The method further comprises the step of applying a fluorescent material having a fluorescent characteristic after the curing step. Hidden line comprising a micro-optical structure having two or more color changes continuous in a constant direction according to the movement made by the method of any one of claims 1 to 3.

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