WO2016036223A1 - Security film - Google Patents

Security film Download PDF

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Publication number
WO2016036223A1
WO2016036223A1 PCT/KR2015/009426 KR2015009426W WO2016036223A1 WO 2016036223 A1 WO2016036223 A1 WO 2016036223A1 KR 2015009426 W KR2015009426 W KR 2015009426W WO 2016036223 A1 WO2016036223 A1 WO 2016036223A1
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WO
WIPO (PCT)
Prior art keywords
film
layer
pattern
security
line
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PCT/KR2015/009426
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French (fr)
Korean (ko)
Inventor
남시욱
김경종
김진영
김종원
Original Assignee
코오롱인더스트리 주식회사
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Application filed by 코오롱인더스트리 주식회사 filed Critical 코오롱인더스트리 주식회사
Priority to EP15837349.8A priority Critical patent/EP3196681A4/en
Priority to US15/505,956 priority patent/US20180217308A1/en
Priority to CN201580047453.2A priority patent/CN106796316A/en
Priority to JP2017512299A priority patent/JP2017529568A/en
Priority claimed from KR1020150126299A external-priority patent/KR20160029722A/en
Publication of WO2016036223A1 publication Critical patent/WO2016036223A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • the present invention relates to a security film having enhanced security, and more particularly, to a security film for high-dimensional applications in which nano patterning technology showing polarization and transmission effects is applied to an information identification layer including various security elements.
  • the polarizing plate which is currently mainly used includes a polarizing plate and a wire grid polarizing plate using an absorption type polarizing film.
  • the wire grid polarizer refers to an array of metal wires arranged in parallel, and transmits or reflects only a specific polarization of electromagnetic waves.
  • Polarizing plate using absorption type polarizing film transmits only 50% of the incident light, while WGP reflects polarization component parallel to the metal wire, transmits the vertical polarization component, and reuses the reflected light. It is characterized by its excellent transmittance and wide viewing angle. WGP having such characteristics is mainly applied to a backlight unit of a display requiring excellent optical characteristics, and is usefully applied to an optical pickup device or a semiconductor.
  • WGP forms an ultraviolet curable resin film or a thermosetting resin film on a film or glass substrate, and then forms a pattern on the resin film using a flexible mold, deposits a metal layer on the resin pattern, and etches to form a curable resin and a metal layer. It may be manufactured by a coexisting structure, or by forming a line lattice pattern and forming a pattern layer made of metal directly on the substrate through an etching process such as dry etching.
  • WGP has a high polarization extinction ratio when the period (pitch) of the metal wire is considerably shorter than the wavelength of incident light.
  • the shorter the period of the metal wire the more difficult it is to manufacture.
  • wire grid polarizers have been used mainly in the microwave or infrared region.
  • the manufacture of fine patterns enables the production of nanowire grid polarizers operating in visible light.
  • WGP is applied to store or protect information at a high level by integrating various security elements as a security device.
  • the present invention is to provide a security film that can not be replicated by storing the nanowire grid polarization technology to the information identification layer including various security elements, and can store a variety of information in higher dimensions.
  • One preferred embodiment according to the present invention is a substrate layer; A nanowire grid polarizing layer comprising a line grid pattern; And at least one information identification layer, wherein the information identification layer is located at at least one of an outer side contacting the base layer, an inner side surface between the base layer and the nanowire grid polarization layer, and an outer side surface contacting the nanowire grid polarization layer.
  • the base layer, the nanowire grid polarization layer and the information identification layer is a security film laminated so that one or more present.
  • the line lattice pattern of the nanowire grid polarization layer is (a) the height of the line lattice: 25 to 300nm; (b) line width of line lattice: 5-75 nm; (c) Aspect (height / line width of line grid) ratio: 0.1 to 3.0; And (d) a pitch of the line grating: 50 to 150 nm.
  • the line grid pattern according to the embodiment may include any one metal particles selected from the group comprising aluminum, copper, chromium, platinum, gold, silver, nickel and alloys thereof.
  • the line grid pattern is the line grid pattern is a pattern formed of metal particles alone; A pattern formed of a curable resin including metal particles therein; And it may be a pattern having a structure of any one of the pattern formed by stacking the metal particles to a height of 10 to 300 nm on the lower skeleton formed of a curable resin.
  • the curable resin is at least one member selected from the group consisting of acrylic resins, methacryl resins, polyvinyl resins, polyester resins, styrene resins, alkyd resins, amino resins, polyurethane resins and silicone resins. It is preferable.
  • the base layer according to the embodiment is a polyethylene terephthalate film, polycarbonate film, polypropylene film, polyethylene film, polystyrene film, polyepoxy film, cyclic olefin polymer (COP) film, cyclic olefin copolymer (COC) It is any one transparent film selected from the group containing a film, a copolymer film of a polycarbonate resin and a cyclic olefin polymer, and a copolymer film of a polycarbonate resin and a cyclic olefin copolymer, or is a glass film Can be.
  • the present invention by incorporating WGP manufactured by sophisticated and technology-intensive nanoimprinting methods into various security elements as well as dealing with nano-level molds, it is possible to provide an information storage medium to the next level and thus illegal forgery and duplication.
  • Security can be enhanced. In particular, it can be easily applied to various printed matters or security documents such as banknotes, securities, identification cards, passports that require security.
  • FIG. 1 is a cross-sectional view showing an example of the security film of the present invention in which the information identification layer is laminated on the outer surface in contact with the base layer.
  • Figure 2 is a cross-sectional view showing an example of the security film of the present invention in which the information identification layer is laminated on the outer surface in contact with the nanowire grid polarization layer.
  • FIG 3 is a cross-sectional view illustrating an example of a security film of the present invention in which an information identification layer is stacked between a base layer and a nanowire grid polarization layer.
  • Figure 4 is a cross-sectional view showing an example of the security film of the present invention in which the information identification layer is laminated on the outer surface and the base layer and the nanowire grid polarization layer in contact with the base layer, respectively.
  • FIG. 5 is a cross-sectional view illustrating an example of a security film of the present invention in which an information identification layer is laminated on an outer surface in contact with a base layer and an outer surface in contact with a nanowire grid polarizing layer.
  • Figure 6 is a cross-sectional view showing an example of the security film of the present invention in which two information identification layers are laminated on the outer surface in contact with the base layer.
  • Figure 7 is a cross-sectional view showing an enlarged structure of the nanowire grid pattern of the nanowire grid polarization layer of the present invention.
  • FIG. 8 is a photograph showing a reflection mode and a transmission mode of the security film manufactured according to an embodiment of the present invention.
  • base layer 101 nano wire grid polarizing layer
  • the present invention is a substrate layer; A nanowire grid polarizing layer comprising a line grid pattern; And at least one information identification layer, wherein the information identification layer is located at at least one of an outer side contacting the base layer, an inner side surface between the base layer and the nanowire grid polarization layer, and an outer side surface contacting the nanowire grid polarization layer. It provides a security film in which the base layer, the nanowire grid polarization layer and the information identification layer is laminated so that at least one exists.
  • the security film of the present invention can be produced in a variety of laminated structure as can be seen through Figures 1 to 6. That is, for example, after the information identification layer is laminated on one surface of the base layer, a nanowire grid polarization (hereinafter referred to as NWGP) layer is formed on the other side so that the information identification layer and the NWGP layer are separated from each other with the base layer interposed therebetween. (See FIG. 1).
  • NWGP nanowire grid polarization
  • the order of formation of the information identification layer and the NWGP layer is not necessarily limited thereto, and the information identification layer may be formed after the NWGP layer is first formed, and the information identification layer may additionally be formed between the base layer and the nanowire grid polarizer (FIG. 4) or an outer surface (see FIG. 5) in contact with the nanowire grid polarizer.
  • the information identification layer may be laminated on the NWGP layer to manufacture a security film having a cross-sectional structure as shown in FIG. 2, or the information identification layer may be formed on one surface of the substrate layer.
  • the NWGP layer may be formed on the upper surface of the information identification layer to manufacture a security film having a cross-sectional structure as shown in FIG. 3.
  • the information identification layer need not be limited to any one layer, and may be formed in a single layer even when only one layer is formed, and two or more sheets are laminated or coated (see FIG. 6). May be applied.
  • it may be more advantageous in that the NWGP layer is formed between the base layer and the information identification layer as shown in FIGS. 2 and 5 in order to minimize the damage of the line pattern of the NWGP.
  • the NWGP layer may be formed by an embossing process of transferring a pattern by pressing a pattern with heat and pressure when laminating a security film, but more preferably by a roll-to-roll coating process of transferring a pattern simultaneously with curing.
  • the imprinting method can be applied, and the lamination method of the information identification layer can be used without limitation as long as it is a lamination method applicable in the art as a method of coating, printing, embossing, and the like.
  • the security element of the information identification layer that is not observed as the light transmits in a specific direction (see the right photo of FIG. 8) is a film. It can be observed by rotating the direction of or by the use of another polarizing film (see the left photo of Figure 8).
  • the security elements observed according to the direction may be changed to further improve the security function, and the pitch of the line pattern of the WGP is highly precise in order to maximize the reflection and transmission modes. , Height, line width, etc. are controlled, so forgery and alteration cannot be made easily.
  • the base layer may be a transparent film or a glass film, specifically, the transparent film is a polyethylene terephthalate film; Polycarbonate film; Polypropylene film; Polyethylene film; Polystyrene film; Polyepoxy film; Cyclic olefin polymer (COP) film; Cyclic olefin copolymer (COC) films; Copolymer films of polycarbonate resins and cyclic olefin polymers; And it may be selected from the film selected from the group consisting of a copolymer film of the polycarbonate resin and the cyclic olefin copolymer.
  • the transparent film is a polyethylene terephthalate film; Polycarbonate film; Polypropylene film; Polyethylene film; Polystyrene film; Polyepoxy film; Cyclic olefin polymer (COP) film; Cyclic olefin copolymer (COC) films; Copolymer films of polycarbonate resins and cyclic
  • the base layer serves to support the pattern layer and the information identification layer, and the thickness may be 5 ⁇ m to 100 ⁇ m, and more preferably 10 ⁇ m to 50 ⁇ m, to favor mechanical strength and flexibility.
  • the thickness exceeds 100 ⁇ m.
  • the security film according to the present invention is required to have a security function rather than physical properties under severe conditions, a thin film having a thickness of 5 ⁇ m to 100 ⁇ m may be manufactured to expand the scope of application.
  • the line lattice pattern included in the nanowire grid polarization layer is a pattern formed by arranging lines having a constant thickness in parallel with a constant width, and when viewed from the side, the cross section has a flat peak and valleys. It shows the form to become.
  • the height of the line grid pattern of the present invention that is, the height of the mountain is 25 to 300nm
  • the width of the concave (gol) that is, the line width, which is the interval from the end of one convex (mountain) to the start of the adjacent convex portion is 5 To 75 nm
  • aspect (height / line width) ratio is preferably 0.1 to 3.0 in terms of further maximizing polarization efficiency.
  • the pitch value in the line lattice pattern is preferably 50 to 150 nm.
  • the pitch refers to the measured distance from the start of any mountain (convex) to the start point of the next mountain, that is, the period of the convex forming the line grid pattern.
  • the nano-polarizing film becomes a polarization phenomenon when the pitch has a value of about half of the visible light wavelength, and the smaller the pitch value is ideal to expect better polarization characteristics (extinction ratio).
  • the pitch of the line pattern is preferably formed to be 50 nm or more in consideration of the difficulty of the etching process and the reduction of the production efficiency, in particular, in the present invention, the reflection mode in which the security element of the information identification layer must be clearly seen.
  • the pitch should be controlled to 150 nm or less, because the difference between the transmission mode and the security element should be transparent.
  • the pitch is controlled to a value within the above range, the characteristics of the polarization (reflection mode) and transmission mode are clearly seen, so that the function as a security element can be further enhanced.
  • the line grid pattern included in the nanowire grid polarizing layer is any one metal selected from the group consisting of aluminum, copper, chromium, platinum, gold, silver, nickel and alloys thereof. It may include particles. In this case, when the particle diameter of the metal particles is too large, a problem may occur in the patterning property, so that the particle size does not exceed 100 nm, and more preferably, the particle diameter may be 1 to 100 nm.
  • the line lattice pattern of the nanowire grid polarization layer may be a pattern formed by metal particles alone, or may be a pattern formed by additionally including a curable resin in the metal particles.
  • the pattern is formed in a state in which the metal particles are contained in the curable resin, or the lower frame of the line grid pattern is formed of the curable resin, and then the skeleton Metal particles may be stacked on top of each other to form a pattern with a height of 10 to 300 nm.
  • a metal lattice when the line lattice pattern is formed by the metal particles alone, a metal lattice may be deposited on the base layer to a predetermined thickness, and the line lattice may be formed through an etching process such as dry etching after forming the pattern.
  • the curable resin alone or a mixture of the curable resin and metal particles is applied to one surface of the base layer, then transferred to a stamp or pattern mold having a line lattice shape, and the resin The pattern may be formed by hardening.
  • the stamp may be made of nickel electroplating, and the master pattern mold may be patterned by a line lattice pattern on an fused silica or silicon wafer by an interference lithography method.
  • the method of forming the line grid pattern in the present invention is not necessarily limited thereto.
  • the metal nanoparticles when the line lattice pattern is formed in a state in which the curable resin and the metal particles are mixed, the metal nanoparticles may be dispersed in the curable resin, or may be melted and mixed with the curable resin.
  • the mixture may include 10 wt% to 90 wt% of the metal nanoparticles based on the total weight of the mixture.
  • the content of the metal nanoparticles is preferably 10% by weight or more in consideration of improving polarization and reflection efficiency, but it is preferable not to exceed 90% by weight in order to prevent the dispersibility or the patterning property from deteriorating due to the aggregation of particles.
  • the step of laminating the metal particles on the convex portions of the pattern lower skeleton formed by the curable resin should be subsequently performed.
  • laminating metal particles first, a metal layer is formed on the curable resin, and an etching process is performed so that the metal layer remains selectively on the convex portion.
  • the convex portion of the formed line grating pattern is as high as possible, and it is more advantageous to satisfy at least 50 nm.
  • the method of stacking the metal particles on the curable resin may be formed using a method such as sputtering, thermal deposition, electron beam deposition, or a dry etching method of simultaneously etching a polymer and a metal to form a metal layer, but is not limited thereto. .
  • a method such as sputtering, thermal deposition, electron beam deposition, or a dry etching method of simultaneously etching a polymer and a metal to form a metal layer, but is not limited thereto.
  • the thickness of the final laminated metal layer after the etching is controlled to be 50 nm or more, In order to prevent the film from falling in flexibility, it is desirable that the thickness thereof does not exceed 300 nm.
  • the curable resin may be a resin of a type capable of forming a pattern by UV curing reaction, acrylic resin, methacrylic resin, polyvinyl resin, polyester resin, styrene resin It is preferable that it is 1 or more types chosen from the group containing alkyd resin, amino resin, polyurethane resin, and silicone resin.
  • curable resins include unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, and hydride.
  • the information identification layer may include one or more security elements selected from the group consisting of holograms, color conversion inks, fluorescent materials, nano-optical lenses and micro-letters.
  • the security element constituting the information identification layer may be manufactured according to a conventional method, it may be a multi-layer structure including a plurality of security elements at the same time according to the use.
  • the hologram is, for example, the embossed hologram disc (shim) and impart a hologram effect, and then a reflective holographic metal layer deposited on aluminum metal about 20 to 100 nm and polyester, PMMA on the reflective holographic metal layer
  • a protective layer formed of a material selected from polymethylmethacrylate, polyamide, polycarbonate, cellulose ester, polyacetal resin, and the like may include a basic structure having a thickness of 2 to 6 ⁇ m.
  • a release layer made of wax, silicon wax, fluorocarbon resin, silicone resin, etc. on the protective layer and polyester, polyacrylate, polycarbonate, cellulose ester, polyacetal, polyamide, etc., on the release layer.
  • One or more carrier film layers selected from may be further laminated, and at least one adhesive layer selected from acrylic resin, epoxy resin, vinyl resin, polyimide, polyester resin, and urethane resin may be formed under the reflective holographic metal layer. Can be.
  • the polyester resin when applying the color conversion ink as a security element of the information identification layer, by mixing a pearl pigment, for example, Iriodin Red, Blue, Green, etc. manufactured by MERCK as a color conversion material to the polyester resin to form a thin film Can be used.
  • the polyester resin preferably has a molecular weight of 21,000 to 26,000 in order to prevent cracking and maximize the color conversion effect, the color conversion material is 5 to 25 ⁇ m average particle diameter in consideration of the gloss and smoothness of the surface of the resin layer Is preferably.
  • the security element of the information identification layer it is also possible to select and apply a so-called fluorescent material that is transparent under visible light (380 to 780 nm) but expresses a specific color at a wavelength of invisible light.
  • Organic phosphors may be selected as a preferable phosphor, and the phosphor may be mixed with a resin such as polyester and printed on a transparent deposition layer, and then dried by hot air to form a phosphor printing unit to be used as an information identification layer. have.
  • the dotted pattern or dotted dots in the background pattern to form a screen tone having the same concentration of 14 to 18%, fine characters of 0.25 to 0.30 mm horizontal, 0.25 to 0.30 mm vertically and 0.20 to 0.29 mm spacing.
  • the identifiable security element can be applied only when confirmed by the magnifying glass.
  • the concentration of the fine text is only 2 to 3% thicker than the density of the screen tone may be impossible to reproduce through copying or output, the screen density and the size of the fine text is not necessarily limited thereto.
  • the security element of the present invention is not limited to the above-described elements, a silver coin that is a security element made to see the pattern or characters in the transmitted light (transmitted light) by inserting a pattern or a character on a specific part in the manufacturing process of the paper It is a thin linear film inserted in watermark and paper, and it is hard to see in reflected light, but security thread, which is clearly visible in transmitted light, can also be applied.
  • special inks such as Intaglio Ink, Magnetic Ink, Infrared Ink, Color-Shifting Ink (CSI), and Metameric Ink Pair are also applied. It can be a target, and nano-optic lenses such as Seegram® can be applied.
  • the hologram of the Kolon mark on one surface of the PET film was imprinted with a UV curing resin to form a hologram pattern to prepare a control group.
  • Example 1 Security film with hologram as information identification layer
  • the hologram pattern was formed by imprinting the hologram of the Kolon mark on one surface of the PET film with a UV curing resin in the same manner as the control group, and then using a UV curing resin on the other side of the PET film on which the hologram pattern was not formed.
  • the lattice pattern was formed by imprinting a pattern having a line width of 50 nm and a height of 100 nm. Finally, 50 nm of aluminum was deposited on the lattice pattern to form a WGP layer having a cross-sectional structure as shown in FIG. 1.
  • Example 2 Security film with hologram and fine character as information identification layer
  • Example 2 was prepared by further laminating a film printed with fine characters on one surface of the security film prepared in the same manner as in Example 1.
  • Example 3 Security Film Having Hologram and Nano Optical Lens as Information Identification Layer
  • Example 3 was prepared by further laminating Seegram® (Rentec Korea) on one surface of the security film manufactured in the same manner as in Example 1.
  • Example 2 Example 3 Transmission mode Observe only hologram Hologram not observed Fine character observation Nano Optical Lens Observation Reflection mode Hologram observation Observe both fine text and hologram Observe both nano-optical lens and hologram
  • the security film of the present invention can be diversified and variable through a single film, so that the security function is superior to the general security element.

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Abstract

The present invention relates to a security film comprising: a substrate layer; a nano-wire grid polarization layer comprising a linear grid pattern; and at least one information identifying layer, wherein the substrate layer, the nano-wire grid polarization layer and the information identifying layer are stacked so that the at least one information identifying layer is located in at least one position from among an outer side surface contacting the substrate layer, an inner side surface between the substrate layer and the nano-wire grid polarization layer, and an outer side surface contacting the nano-wire grid polarization layer. The present invention can provide a high-level information storage medium by combining a nano-wire grid polarization film produced by a nano imprinting method with various security elements, so that it is possible to enhance security against illegal counterfeiting and copying.

Description

보안 필름Security film
본 발명은 보안성이 강화된 보안 필름에 관한 것으로서, 보다 구체적으로는 다양한 보안요소를 포함하는 정보 식별층에 편광 및 투과 효과를 나타내는 나노 패터닝 기술이 접목된 고차원적인 용도의 보안필름에 관한 것이다.The present invention relates to a security film having enhanced security, and more particularly, to a security film for high-dimensional applications in which nano patterning technology showing polarization and transmission effects is applied to an information identification layer including various security elements.
최근 불법적인 위조, 복사, 복제 및 무단도용 등의 기술마저 고도화되고, 각종 분야에서 철저한 보안이 요구되는 시대가 초래함에 따라 단순한 식별장치를 이용한 1차원적인 보안기술로는 불법 행위를 방지하거나 근절할 수 없는 상황이 되었다. 이에 따라 보안기술은 더 이상 단독으로 사용되지 않고 2가지 이상의 식별장치가 접목되어 사용되고 있으며, 홀로그램, 색변환 잉크, 워터마크, 형광물질, 미세문자, RFID태그, 액정성 화합물 등의 식별장치들이 서로 접목되어 보안이 더욱 강화된 형태로서 개발되고 있는 상황이다.Recently, technology such as illegal counterfeiting, copying, duplication, and unauthorized use has been advanced, and a thorough security is required in various fields, and a one-dimensional security technology using a simple identification device can prevent or eradicate illegal activities. It became impossible situation. Accordingly, security technology is no longer used alone, but two or more identification devices are combined and used, and identification devices such as holograms, color conversion inks, watermarks, fluorescent materials, microcharacters, RFID tags, and liquid crystal compounds The situation is being developed as a security enhanced form.
그 가운데에서도 특히 홀로그램은 복잡한 과정을 거쳐 제작되기 때문에 동일한 정보를 복제하는 것이 곤란하므로 은행이나 신용카드에 위조 방지를 위해 채용되고 있으며 각종 서적 및 테이프에도 불법 복제를 방지하기 위한 수단으로 이용되고 있다. 또한, 대한민국 등록특허 제0736481호 "디지털 워터마크 이미지가 포함된 위·변조방지용 홀로그램박막필름 및 이의 제조방법", 대한민국 공개특허 제2012-0077845호 "알에프아이디가 결합된 제품형 증착필름 및 이를 이용한 보안시스템" 및 일본 등록특허 제05380007호 "위조방지 매체" 등에서 볼 수 있듯이, 홀로그램 기술을 기반으로 하여 여러 가지 보안요소들을 접목한 기술이 가장 활발히 개발되고 있는 추세이다.In particular, since holograms are produced through a complicated process, it is difficult to duplicate the same information. Therefore, holograms are used to prevent counterfeiting in banks and credit cards, and various books and tapes are also used as a means of preventing illegal copying. In addition, the Republic of Korea Patent No. 0764481 "Forgery and alteration prevention holographic thin film containing a digital watermark image and its manufacturing method", Republic of Korea Patent Publication No. 2012-0077845 "RFID combined product type film and using the same Security system "and Japanese Patent No. 05380007" Anti-counterfeiting medium "and the like, technology that combines various security elements based on hologram technology is the most active development.
한편, 현재 주로 사용되고 있는 편광판에는 흡수형 편광 필름을 이용한 편광판과 와이어 그리드 편광판이 있다. 여기서 와이어 그리드 편광판(Wire Grid Polarizer, WGP)은 금속 와이어가 평행하게 배열된 어레이를 말하며, 전자기파 중 특정 편광만을 투과시키거나 반사시키는 역할을 한다. 흡수형 편광 필름을 이용한 편광판은 입사 광선의 50%만 투과시키는 반면, WGP는 금속 와이어와 평행한 편광 성분은 반사하고 수직한 편광 성분은 투과시키며, 반사된 광을 재이용할 수 있다는 점에서 편광 효율이 우수하고 투과율이 높으며 시야각이 넓은 것이 특징이다. 이러한 특징의 WGP는 우수한 광학특성이 요구되는 디스플레이의 백라이트 유닛에 주로 적용되고, 광 픽업장치 또는 반도체에 유용하게 적용되고 있다.On the other hand, the polarizing plate which is currently mainly used includes a polarizing plate and a wire grid polarizing plate using an absorption type polarizing film. Here, the wire grid polarizer (WGP) refers to an array of metal wires arranged in parallel, and transmits or reflects only a specific polarization of electromagnetic waves. Polarizing plate using absorption type polarizing film transmits only 50% of the incident light, while WGP reflects polarization component parallel to the metal wire, transmits the vertical polarization component, and reuses the reflected light. It is characterized by its excellent transmittance and wide viewing angle. WGP having such characteristics is mainly applied to a backlight unit of a display requiring excellent optical characteristics, and is usefully applied to an optical pickup device or a semiconductor.
일반적으로 WGP는 필름 또는 유리기판 위에 자외선 경화성 수지막 또는 열경화성 수지막을 형성한 다음, 유연 몰드를 이용하여 상기 수지막에 패턴을 형성한 후 수지 패턴 위에 금속층을 증착하고, 식각하여 경화성 수지와 금속층이 공존하는 구조로 제조하거나, 또는 선 격자 패턴을 형성하고 드라이(dry)에칭과 같은 식각공정을 통해 기판위에 곧바로 금속으로만 이루어진 패턴층을 형성하는 방법으로 제조할 수 있다.In general, WGP forms an ultraviolet curable resin film or a thermosetting resin film on a film or glass substrate, and then forms a pattern on the resin film using a flexible mold, deposits a metal layer on the resin pattern, and etches to form a curable resin and a metal layer. It may be manufactured by a coexisting structure, or by forming a line lattice pattern and forming a pattern layer made of metal directly on the substrate through an etching process such as dry etching.
WGP는 금속 와이어의 주기(피치)가 입사광의 파장에 비하여 상당히 짧아야 편광 소멸비가 높아지는데, 금속 와이어의 주기가 짧을수록 제작이 어려워 지금까지의 와이어 그리드 편광판은 주로 마이크로파 또는 적외선 영역에서 사용되어 왔다. 그러나, 최근 반도체 제조 장비와 노광 기술의 발달로 미세 패턴의 제작이 가능해짐에 따라 가시광선에서 동작하는 나노 와이어 그리드 편광판의 제조가 가능해지고 있다. 다만, WGP의 제조 기술은 쉽게 도용하거나 따라할 수 없음에도 불구하고, WGP를 보안용 장치로서 여러 가지 보안 요소들과 접목하여 고차원적으로 정보를 저장하거나 보호할 수 있도록 적용한 사례는 전무한 실정이다. WGP has a high polarization extinction ratio when the period (pitch) of the metal wire is considerably shorter than the wavelength of incident light. However, the shorter the period of the metal wire, the more difficult it is to manufacture. Thus, wire grid polarizers have been used mainly in the microwave or infrared region. However, with the recent development of semiconductor manufacturing equipment and exposure technology, the manufacture of fine patterns enables the production of nanowire grid polarizers operating in visible light. However, despite the fact that the manufacturing technology of WGP cannot be easily stealed or followed, there has been no case where WGP is applied to store or protect information at a high level by integrating various security elements as a security device.
이에 본 발명은 다양한 보안요소를 포함하는 정보 식별층에 나노 와이어 그리드 편광 기술을 접목함으로써 복제가 불가능하고, 다양한 정보를 보다 고차원적으로 저장할 수 있는 보안필름을 제공하고자 한다.Accordingly, the present invention is to provide a security film that can not be replicated by storing the nanowire grid polarization technology to the information identification layer including various security elements, and can store a variety of information in higher dimensions.
본 발명에 따른 바람직한 일 구현예는 기재층; 선 격자 패턴을 포함하는 나노 와이어 그리드 편광층; 및 1 이상의 정보 식별층을 포함하되, 상기 기재층과 접하는 외측면, 기재층과 나노 와이어 그리드 편광층 사이의 내측면 및 나노 와이어 그리드 편광층과 접하는 외측면 중 적어도 하나의 위치에 정보 식별층이 1 이상 존재하도록 상기 기재층, 나노와이어 그리드 편광층 및 정보식별층이 적층된 보안필름이다.One preferred embodiment according to the present invention is a substrate layer; A nanowire grid polarizing layer comprising a line grid pattern; And at least one information identification layer, wherein the information identification layer is located at at least one of an outer side contacting the base layer, an inner side surface between the base layer and the nanowire grid polarization layer, and an outer side surface contacting the nanowire grid polarization layer. The base layer, the nanowire grid polarization layer and the information identification layer is a security film laminated so that one or more present.
상기 구현예에 의한 나노 와이어 그리드 편광층의 선 격자 패턴은 (a) 선 격자의 높이: 25 내지 300nm; (b) 선 격자의 선폭: 5 내지 75 nm; (c) Aspect(선 격자의 높이/선폭) ratio: 0.1 내지 3.0; 및 (d) 선 격자의 피치(pitch): 50 내지 150nm의 특징을 만족하는 것일 수 있다.The line lattice pattern of the nanowire grid polarization layer according to the embodiment is (a) the height of the line lattice: 25 to 300nm; (b) line width of line lattice: 5-75 nm; (c) Aspect (height / line width of line grid) ratio: 0.1 to 3.0; And (d) a pitch of the line grating: 50 to 150 nm.
상기 구현예에 의한 선 격자 패턴은 알루미늄, 구리, 크롬, 백금, 금, 은, 니켈 및 이들의 합금을 포함하는 그룹으로부터 선택된 어느 하나의 금속 입자를 포함할 수 있다.The line grid pattern according to the embodiment may include any one metal particles selected from the group comprising aluminum, copper, chromium, platinum, gold, silver, nickel and alloys thereof.
또한, 상기 선 격자 패턴은 상기 선 격자 패턴은 금속 입자 단독으로 형성된 패턴; 내부에 금속입자가 포함된 경화성 수지로 형성된 패턴; 및 경화성 수지로 형성된 하부 골격 상부에 금속 입자가 10 내지 300 nm의 높이로 적층되어 형성된 패턴 중 어느 하나의 구조를 갖는 패턴일 수 있다.In addition, the line grid pattern is the line grid pattern is a pattern formed of metal particles alone; A pattern formed of a curable resin including metal particles therein; And it may be a pattern having a structure of any one of the pattern formed by stacking the metal particles to a height of 10 to 300 nm on the lower skeleton formed of a curable resin.
이때, 상기 경화성 수지는 아크릴계 수지, 메타아크릴계 수지, 폴리비닐계 수지, 폴리에스테르계 수지, 스티렌계 수지, 알키드계 수지, 아미노계 수지, 폴리우레탄계 수지 및 실리콘계 수지를 포함하는 그룹으로부터 선택된 1종 이상인 것이 바람직하다.In this case, the curable resin is at least one member selected from the group consisting of acrylic resins, methacryl resins, polyvinyl resins, polyester resins, styrene resins, alkyd resins, amino resins, polyurethane resins and silicone resins. It is preferable.
상기 구현예에 의한 기재층은 폴리에틸렌테레프탈레이트 필름, 폴리카보네이트 필름, 폴리프로필렌 필름, 폴리에틸렌 필름, 폴리스티렌 필름, 폴리에폭시 필름, 고리형 올레핀계 중합체(COP) 필름, 고리형 올레핀계 공중합체(COC) 필름, 폴리카보네이트계 수지와 고리형 올레핀계 중합체의 공중합체 필름 및 폴리카보네이트계 수지와 고리형 올레핀계 공중합체의 공중합체 필름을 포함하는 그룹으로부터 선택된 어느 하나의 투명 필름이거나, 또는 유리 필름인 것일 수 있다.The base layer according to the embodiment is a polyethylene terephthalate film, polycarbonate film, polypropylene film, polyethylene film, polystyrene film, polyepoxy film, cyclic olefin polymer (COP) film, cyclic olefin copolymer (COC) It is any one transparent film selected from the group containing a film, a copolymer film of a polycarbonate resin and a cyclic olefin polymer, and a copolymer film of a polycarbonate resin and a cyclic olefin copolymer, or is a glass film Can be.
본 발명에 따르면 나노 레벨의 금형을 다루는 만큼 정교하고 기술 집약적인 나노임프린팅법으로 제조한 WGP를 다양한 보안요소에 접목함으로써 한 차원 더 우수한 정보저장 매체를 제공할 수 있으며, 이에 따라 불법 위조 및 복제에 대한 보안성을 강화 수 있다. 특히, 보안성이 요구되는 은행권, 유가증권류, 신분증, 여권 등 각종 인쇄물 또는 보안 문서에 용이하게 적용할 수 있다.According to the present invention, by incorporating WGP manufactured by sophisticated and technology-intensive nanoimprinting methods into various security elements as well as dealing with nano-level molds, it is possible to provide an information storage medium to the next level and thus illegal forgery and duplication. Security can be enhanced. In particular, it can be easily applied to various printed matters or security documents such as banknotes, securities, identification cards, passports that require security.
도 1은 기재층과 접하는 외측면에 정보 식별층이 적층된 본 발명의 보안필름의 일예를 나타낸 단면도이다.1 is a cross-sectional view showing an example of the security film of the present invention in which the information identification layer is laminated on the outer surface in contact with the base layer.
도 2은 나노 와이어 그리드 편광층과 접하는 외측면에 정보 식별층이 적층된 본 발명의 보안필름의 일예를 나타낸 단면도이다.Figure 2 is a cross-sectional view showing an example of the security film of the present invention in which the information identification layer is laminated on the outer surface in contact with the nanowire grid polarization layer.
도 3은 기재층과 나노 와이어 그리드 편광층 사이면에 정보 식별층이 적층된 본 발명의 보안필름의 일예를 나타낸 단면도이다.3 is a cross-sectional view illustrating an example of a security film of the present invention in which an information identification layer is stacked between a base layer and a nanowire grid polarization layer.
도 4는 기재층과 접하는 외측면 및 기재층과 나노 와이어 그리드 편광층 사이면에 각각 정보 식별층이 적층된 본 발명의 보안필름의 일예를 나타낸 단면도이다.Figure 4 is a cross-sectional view showing an example of the security film of the present invention in which the information identification layer is laminated on the outer surface and the base layer and the nanowire grid polarization layer in contact with the base layer, respectively.
도 5는 기재층과 접하는 외측면 및 나노 와이어 그리드 편광층과 접하는 외측면에 각각 정보 식별층이 적층된 본 발명의 보안필름의 일예를 나타낸 단면도이다.FIG. 5 is a cross-sectional view illustrating an example of a security film of the present invention in which an information identification layer is laminated on an outer surface in contact with a base layer and an outer surface in contact with a nanowire grid polarizing layer.
도 6은 기재층과 접하는 외측면에 2 가지의 정보 식별층이 적층된 본 발명의 보안필름의 일예를 나타낸 단면도이다.Figure 6 is a cross-sectional view showing an example of the security film of the present invention in which two information identification layers are laminated on the outer surface in contact with the base layer.
도 7은 본 발명의 나노 와이어 그리드 편광층의 나노 선 격자 패턴을 확대한 구조를 나타낸 단면도이다.Figure 7 is a cross-sectional view showing an enlarged structure of the nanowire grid pattern of the nanowire grid polarization layer of the present invention.
도 8은 본 발명의 바람직한 일 구현예에 따라 제조된 보안필름의 반사모드와 투과모드를 나타내는 사진이다.8 is a photograph showing a reflection mode and a transmission mode of the security film manufactured according to an embodiment of the present invention.
100: 기재층 101: 나노 와이어 그리드 편광층100: base layer 101: nano wire grid polarizing layer
102, 102(a), 102(b): 정보 식별층102, 102 (a) and 102 (b): information identification layer
201: 선 격자 패턴의 높이 202: 선 격자 패턴의 피치(Pitch)부201: Height of the line grid pattern 202: Pitch portion of the line grid pattern
203: 선 격자 패턴의 선폭203: line width of the line grid pattern
본 발명은 기재층; 선 격자 패턴을 포함하는 나노 와이어 그리드 편광층; 및 1 이상의 정보 식별층을 포함하되, 상기 기재층과 접하는 외측면, 기재층과 나노 와이어 그리드 편광층 사이의 내측면 및 나노 와이어 그리드 편광층과 접하는 외측면 중 적어도 하나의 위치에 정보 식별층이 1 이상 존재하도록 상기 기재층, 나노와이어 그리드 편광층 및 정보식별층이 적층된 보안필름을 제공한다.The present invention is a substrate layer; A nanowire grid polarizing layer comprising a line grid pattern; And at least one information identification layer, wherein the information identification layer is located at at least one of an outer side contacting the base layer, an inner side surface between the base layer and the nanowire grid polarization layer, and an outer side surface contacting the nanowire grid polarization layer. It provides a security film in which the base layer, the nanowire grid polarization layer and the information identification layer is laminated so that at least one exists.
먼저, 본 발명의 보안필름은 도 1 내지 6을 통해 확인할 수 있듯이 다양한 적층 구조로 제조가 가능하다. 즉, 일 예로 기재층의 일면에 정보 식별층을 적층한 후, 다른 일면에 나노 와이어 그리드 편광(이하, NWGP)층을 형성함으로써 기재층을 사이에 두고 정보 식별층과 NWGP층이 이격되어 있는 형태(도 1 참조)로 제조할 수 있다. 이때, 정보 식별층과 NWGP층의 형성순서는 반드시 이에 제한되지 않고, NWGP층을 먼저 형성한 후 정보 식별층을 형성하는 것도 가능하며, 정보 식별층은 추가적으로 기재층과 나노 와이어 그리드 편광판 사이(도 4 참조) 또는 나노와이어 그리드 편광판과 접하는 외측면(도 5 참조)에 추가로 형성할 수도 있다.First, the security film of the present invention can be produced in a variety of laminated structure as can be seen through Figures 1 to 6. That is, for example, after the information identification layer is laminated on one surface of the base layer, a nanowire grid polarization (hereinafter referred to as NWGP) layer is formed on the other side so that the information identification layer and the NWGP layer are separated from each other with the base layer interposed therebetween. (See FIG. 1). In this case, the order of formation of the information identification layer and the NWGP layer is not necessarily limited thereto, and the information identification layer may be formed after the NWGP layer is first formed, and the information identification layer may additionally be formed between the base layer and the nanowire grid polarizer (FIG. 4) or an outer surface (see FIG. 5) in contact with the nanowire grid polarizer.
또한, 기재층의 일면에 NWGP층을 형성한 후, NWGP층의 상부에 정보 식별층을 적층하여 도 2와 같은 단면 구조를 갖는 보안필름으로 제조할 수도 있고, 기재층의 일면에 정보 식별층을 먼저 형성한 후, 정보 식별층의 상면에 NWGP층을 형성하여 도 3과 같은 단면 구조를 갖는 보안필름으로 제조할 수도 있다. 이 경우 역시, 정보식별층은 어느 한 층에만 한정되어 형성될 필요는 없으며, 한 층에만 형성될 경우라도 단층 형태로 형성될 수도 있고, 2 장 이상이 합지 내지 코팅된 형태로 적층(도 6 참조)될 수도 있다. 다만, 도 2 및 도 5와 같이 NWGP 층이 기재층과 정보식별층 사이에 형성되는 것이 NWGP의 선 패턴이 손상되는 것을 최소화할 수 있다는 점에서 좀더 유리할 수는 있다.In addition, after the NWGP layer is formed on one surface of the substrate layer, the information identification layer may be laminated on the NWGP layer to manufacture a security film having a cross-sectional structure as shown in FIG. 2, or the information identification layer may be formed on one surface of the substrate layer. After forming first, the NWGP layer may be formed on the upper surface of the information identification layer to manufacture a security film having a cross-sectional structure as shown in FIG. 3. In this case, too, the information identification layer need not be limited to any one layer, and may be formed in a single layer even when only one layer is formed, and two or more sheets are laminated or coated (see FIG. 6). May be applied. However, it may be more advantageous in that the NWGP layer is formed between the base layer and the information identification layer as shown in FIGS. 2 and 5 in order to minimize the damage of the line pattern of the NWGP.
본 발명에서 보안 필름 적층시 상기 NWGP층의 경우, 열과 압력으로 패턴을 찍어 눌러 패턴을 전사하는 엠보싱 프로세스에 의해서도 형성할 수 있으나, 보다 바람직하게는 경화와 동시에 패턴을 전사하는 롤투롤 코팅 프로세스에 의한 임프린팅법을 적용할 수 있고, 정보 식별층의 적층 방법은 코팅, 인쇄, 엠보싱 등의 방법으로서 동일 기술분야에서 적용가능한 적층법이라면 제한되지 않고 사용될 수 있다.In the present invention, the NWGP layer may be formed by an embossing process of transferring a pattern by pressing a pattern with heat and pressure when laminating a security film, but more preferably by a roll-to-roll coating process of transferring a pattern simultaneously with curing. The imprinting method can be applied, and the lamination method of the information identification layer can be used without limitation as long as it is a lamination method applicable in the art as a method of coating, printing, embossing, and the like.
본 발명의 보안필름은 나노 와이어 그리드 편광층에 의한 빛의 투과와 반사 원리를 이용하는 것이므로, 특정 방향에서는 빛이 투과함에 따라 관찰되지 않던 정보 식별층의 보안요소(도 8의 오른쪽 사진 참조)가 필름의 방향을 틀어주거나 또 다른 편광필름 등의 사용에 의해 관찰될 수 있는 것(도 8의 왼쪽 사진 참조)이다. 또한, 여러 장의 정보 식별층을 동시에 포함할 경우, 방향에 따라 관찰되는 보안요소들이 변화하여 보안 기능이 더욱 향상될 수 있으며, 반사와 투과 모드를 극대화하기 위해서 매우 정밀한 공정으로 WGP의 선 패턴의 피치, 높이, 선폭 등을 제어하므로 위·변조가 용이하게 이루어질 수가 없다.Since the security film of the present invention uses the principle of light transmission and reflection by the nanowire grid polarization layer, the security element of the information identification layer that is not observed as the light transmits in a specific direction (see the right photo of FIG. 8) is a film. It can be observed by rotating the direction of or by the use of another polarizing film (see the left photo of Figure 8). In addition, when multiple layers of information identification are included at the same time, the security elements observed according to the direction may be changed to further improve the security function, and the pitch of the line pattern of the WGP is highly precise in order to maximize the reflection and transmission modes. , Height, line width, etc. are controlled, so forgery and alteration cannot be made easily.
이하, 본 발명의 보안필름을 구성하는 각의 층에 대하여 구체적으로 설명한다.Hereinafter, each layer constituting the security film of the present invention will be described in detail.
[기재층][Base layer]
본 발명의 바람직한 양태에 따르면, 상기 기재층은 투명 필름 또는 유리 필름일 수 있으며, 구체적으로, 상기 투명 필름은 폴리에틸렌테레프탈레이트 필름; 폴리카보네이트 필름; 폴리프로필렌 필름; 폴리에틸렌 필름; 폴리스티렌 필름; 폴리에폭시 필름; 고리형 올레핀계 중합체(COP) 필름; 고리형 올레핀계 공중합체(COC) 필름; 폴리카보네이트계 수지와 고리형 올레핀계 중합체의 공중합체 필름; 및 폴리카보네이트계 수지와 고리형 올레핀계 공중합체의 공중합체 필름으로 구성된 군에서 선택되는 필름에서 선택될 수 있다.According to a preferred embodiment of the present invention, the base layer may be a transparent film or a glass film, specifically, the transparent film is a polyethylene terephthalate film; Polycarbonate film; Polypropylene film; Polyethylene film; Polystyrene film; Polyepoxy film; Cyclic olefin polymer (COP) film; Cyclic olefin copolymer (COC) films; Copolymer films of polycarbonate resins and cyclic olefin polymers; And it may be selected from the film selected from the group consisting of a copolymer film of the polycarbonate resin and the cyclic olefin copolymer.
상기 기재층은 패턴층과 정보 식별층을 지지하는 역할을 하며 두께는 기계적 강도 및 유연성에 있어서 유리하도록 5㎛ 내지 100㎛일 수 있으며, 보다 바람직하게는 10㎛ 내지 50㎛일 수 있다. 통상적으로 디스플레이와 같이 가혹조건에 적용되는 편광필름의 경우 3장 이상의 필름을 합지시켜 기재층으로 사용하였으므로 두께가 100㎛를 초과한다. 이에 반해 본 발명에 따른 보안필름은 가혹 조건에서의 물성보다는 보안 기능이 요구되는 것이므로 5㎛ 내지 100㎛의 두께로 박막화하여 제조되어 적용범위가 보다 확대될 수 있다.The base layer serves to support the pattern layer and the information identification layer, and the thickness may be 5 μm to 100 μm, and more preferably 10 μm to 50 μm, to favor mechanical strength and flexibility. In general, in the case of a polarizing film applied to harsh conditions such as a display, since three or more films are laminated and used as a base layer, the thickness exceeds 100 μm. On the contrary, since the security film according to the present invention is required to have a security function rather than physical properties under severe conditions, a thin film having a thickness of 5 μm to 100 μm may be manufactured to expand the scope of application.
[패턴층][Pattern Layer]
본 발명의 바람직한 양태에 따르면, 나노 와이어 그리드 편광층에 포함된 선 격자 패턴은 일정한 두께를 갖는 라인이 일정한 폭으로 평행하게 배열되어 형성한 무늬로써, 측면에서 보았을 때 그 단면은 평탄한 산과 골이 반복되는 형태를 나타낸다. 이때, 본 발명의 선 격자 패턴의 높이 즉, 산의 높이는 25 내지 300nm 이고, 오목부(골)의 폭 즉, 하나의 볼록부(산) 끝지점에서 인접한 볼록부의 시작점까지의 간격인 선폭은 5 내지 75 nm이며, 특히 편광효율을 보다 극대화하는 측면에서 Aspect(높이/선폭) ratio는 0.1 내지 3.0을 만족하는 것이 바람직하다.According to a preferred embodiment of the present invention, the line lattice pattern included in the nanowire grid polarization layer is a pattern formed by arranging lines having a constant thickness in parallel with a constant width, and when viewed from the side, the cross section has a flat peak and valleys. It shows the form to become. At this time, the height of the line grid pattern of the present invention, that is, the height of the mountain is 25 to 300nm, the width of the concave (gol), that is, the line width, which is the interval from the end of one convex (mountain) to the start of the adjacent convex portion is 5 To 75 nm, and in particular, aspect (height / line width) ratio is preferably 0.1 to 3.0 in terms of further maximizing polarization efficiency.
또한, 본 발명의 바람직한 양태에 따르면, 상기 선 격자 패턴에서 피치(pitch)값은 50 내지 150nm인 것이 바람직하다. 여기서 피치(pitch)는 임의의 산(볼록부)이 형성된 시작 부분에서 다음 산이 형성되는 시작점까지의 측정한 거리, 즉, 상기 선 격자 패턴을 이루는 볼록부의 주기를 가리킨다. 일반적으로 나노 편광필름은 피치가 가시광 파장의 절반 가량의 값을 가질 때 편광현상이 뚜렷해지며 보다 우수한 편광특성(소광비, extinction ratio)을 기대하기 위해서는 피치 값은 작을수록 이상적이다.Further, according to a preferred embodiment of the present invention, the pitch value in the line lattice pattern is preferably 50 to 150 nm. Herein, the pitch refers to the measured distance from the start of any mountain (convex) to the start point of the next mountain, that is, the period of the convex forming the line grid pattern. In general, the nano-polarizing film becomes a polarization phenomenon when the pitch has a value of about half of the visible light wavelength, and the smaller the pitch value is ideal to expect better polarization characteristics (extinction ratio).
다만, 본 발명에서 상기 선 패턴의 피치는 식각공정의 곤란함과 생산효율 저하 방지를 고려하여 50nm 이상으로 형성하는 것이 바람직하며, 특히, 본 발명에서는 정보 식별층의 보안요소가 뚜렷이 보여야 하는 반사 모드와 보안요소가 투명하게 보여야하는 투과 모드의 차이가 뚜렷하게 나타나야 하므로 피치는 150nm 이하로 제어하는 것이 바람직하다. 피치가 상기 범위내의 값으로 제어될 경우, 편광(반사 모드)와 투과 모드의 특성이 뚜렷하게 나타나므로 보안 요소로서의 기능이 보다 강화될 수 있다.However, in the present invention, the pitch of the line pattern is preferably formed to be 50 nm or more in consideration of the difficulty of the etching process and the reduction of the production efficiency, in particular, in the present invention, the reflection mode in which the security element of the information identification layer must be clearly seen. The pitch should be controlled to 150 nm or less, because the difference between the transmission mode and the security element should be transparent. When the pitch is controlled to a value within the above range, the characteristics of the polarization (reflection mode) and transmission mode are clearly seen, so that the function as a security element can be further enhanced.
한편, 본 발명의 바람직한 양태에 따르면, 상기 나노 와이어 그리드 편광층에 포함된 선 격자 패턴은 알루미늄, 구리, 크롬, 백금, 금, 은, 니켈 및 이들의 합금을 포함하는 그룹으로부터 선택된 어느 하나의 금속 입자를 포함할 수 있다. 이때, 상기 금속 입자의 입경이 지나치게 클 경우 패터닝성에 문제가 발생할 수 있으므로 100nm를 넘지 않는 것이 바람직하며, 보다 바람직하게는 입경이 1 내지 100nm일 수 있다.Meanwhile, according to a preferred embodiment of the present invention, the line grid pattern included in the nanowire grid polarizing layer is any one metal selected from the group consisting of aluminum, copper, chromium, platinum, gold, silver, nickel and alloys thereof. It may include particles. In this case, when the particle diameter of the metal particles is too large, a problem may occur in the patterning property, so that the particle size does not exceed 100 nm, and more preferably, the particle diameter may be 1 to 100 nm.
상기 나노 와이어 그리드 편광층의 선 격자 패턴은 금속 입자 단독으로 형성된 패턴일 수 있으며, 금속입자에 경화성 수지를 추가적으로 포함하여 형성된 패턴일 수도 있다. 경화성 수지를 추가적으로 포함하여 상기 선 격자 패턴을 형성할 경우에는 보다 구체적으로, 경화성 수지 내부에 금속 입자가 포함된 상태로 패턴을 형성하거나, 경화성 수지로 선 격자 패턴의 하부 골격이 형성한 후, 골격 상부에 금속입자를 10 내지 300 nm의 높이로 적층하여 패턴을 형성할 수 있다.The line lattice pattern of the nanowire grid polarization layer may be a pattern formed by metal particles alone, or may be a pattern formed by additionally including a curable resin in the metal particles. In the case of forming the line grid pattern by additionally including a curable resin, more specifically, the pattern is formed in a state in which the metal particles are contained in the curable resin, or the lower frame of the line grid pattern is formed of the curable resin, and then the skeleton Metal particles may be stacked on top of each other to form a pattern with a height of 10 to 300 nm.
본 발명에서 상기 선 격자 패턴을 금속 입자 단독으로 형성할 경우, 기재층에 금속을 일정 두께로 증착하고, 패턴을 형성한 후 드라이(dry)에칭과 같은 식각공정을 통해 선 격자를 형성시킬 수 있다. 또한, 경화성 수지를 더 포함하여 패턴을 형성할 경우, 경화성 수지 단독 또는 경화성 수지와 금속입자의 혼합물을 기재층의 일면에 도포한 후, 선 격자 모양이 형성되어 있는 스탬프 또는 패턴 몰드로 전사하고 수지를 경화시키는 단계로 패턴을 형성할 수 있다. 이때, 스탬프는 니켈 전주 도금으로 제작된 것일 수 있고, 마스터 패턴 몰드는 용융 실리카 혹은 실리콘 웨이퍼 위에 간섭 리쏘그래피 법으로 선 격자 모양이 패턴화된 것일 수 있다. 다만, 본 발명에서 선 격자 패턴을 형성하는 방법이 반드시 이에 제한되는 것은 아니다.In the present invention, when the line lattice pattern is formed by the metal particles alone, a metal lattice may be deposited on the base layer to a predetermined thickness, and the line lattice may be formed through an etching process such as dry etching after forming the pattern. . In addition, in the case of forming a pattern by further including a curable resin, the curable resin alone or a mixture of the curable resin and metal particles is applied to one surface of the base layer, then transferred to a stamp or pattern mold having a line lattice shape, and the resin The pattern may be formed by hardening. In this case, the stamp may be made of nickel electroplating, and the master pattern mold may be patterned by a line lattice pattern on an fused silica or silicon wafer by an interference lithography method. However, the method of forming the line grid pattern in the present invention is not necessarily limited thereto.
본 발명에서 경화성 수지와 금속입자를 혼합한 상태로 선 격자 패턴을 형성할 경우, 상기 금속 나노입자는 경화성 수지 내에 분산되어 있거나, 용융되어 경화성 수지와 혼합되어 있는 것일 수 있으며, 이 때, 분산물 또는 혼합물은 금속 나노입자를 전체 혼합물 중량대비 10 내지 90중량% 포함할 수 있다. 상기 금속 나노입자의 함량은 편광 및 반사효율 향상을 고려하여 10중량% 이상인 것이 바람직하나 다만 입자의 뭉침에 의한 분산성 또는 패터닝성의 저하를 방지하기 위해서는 90중량%를 초과하지 않도록 하는 것이 바람직하다.In the present invention, when the line lattice pattern is formed in a state in which the curable resin and the metal particles are mixed, the metal nanoparticles may be dispersed in the curable resin, or may be melted and mixed with the curable resin. Alternatively, the mixture may include 10 wt% to 90 wt% of the metal nanoparticles based on the total weight of the mixture. The content of the metal nanoparticles is preferably 10% by weight or more in consideration of improving polarization and reflection efficiency, but it is preferable not to exceed 90% by weight in order to prevent the dispersibility or the patterning property from deteriorating due to the aggregation of particles.
반면, 경화성 수지를 단독으로 사용하여 하부 골격을 형성한 경우라면, 경화성 수지에 의해 형성된 패턴 하부 골격의 볼록부에 금속입자를 적층시키는 단계가 후속적으로 수행되어야 한다. 금속입자를 적층시킬 때는, 우선 경화성 수지 상부에 금속층을 형성하고, 볼록부에만 선택적으로 금속층이 남아 있게 하기 위해 에칭공정을 진행하게 되는데, 금속층을 형성 후 에칭공정을 원활하게 하기 위해서는 경화성 수지에 의해 형성된 선 격자 패턴의 볼록부가 가능한 높은 것이 바람직하며, 최소 50nm는 만족하는 것이 보다 유리하다.On the other hand, when the lower skeleton is formed by using the curable resin alone, the step of laminating the metal particles on the convex portions of the pattern lower skeleton formed by the curable resin should be subsequently performed. When laminating metal particles, first, a metal layer is formed on the curable resin, and an etching process is performed so that the metal layer remains selectively on the convex portion. In order to smooth the etching process after forming the metal layer, It is preferable that the convex portion of the formed line grating pattern is as high as possible, and it is more advantageous to satisfy at least 50 nm.
경화성 수지 상부에 금속입자를 적층시키는 방법은 스퍼터링, 열증착, 전자선 증착, 또는 고분자와 금속을 동시에 식각하여 금속층을 형성하는 건식 에칭방법 등의 방법을 이용하여 형성할 수 있으나, 이에 제한되지는 않는다. 다만, 에칭 공정시 선 격자 패턴의 볼록부에만 선택적으로 금속을 형성시키기 용이하고, 충분한 편광 및 반사 효율을 나타내기 위해 에칭 후 최종 적층된 금속층의 두께는 50nm 이상이 되도록 제어하되, 금속의 산화나 필름의 유연성 저하 방지를 위하여 그 두께는 300nm를 초과하지 않도록 하는 것이 바람직하다. The method of stacking the metal particles on the curable resin may be formed using a method such as sputtering, thermal deposition, electron beam deposition, or a dry etching method of simultaneously etching a polymer and a metal to form a metal layer, but is not limited thereto. . However, in the etching process, it is easy to selectively form a metal only in the convex portion of the line lattice pattern, and in order to exhibit sufficient polarization and reflection efficiency, the thickness of the final laminated metal layer after the etching is controlled to be 50 nm or more, In order to prevent the film from falling in flexibility, it is desirable that the thickness thereof does not exceed 300 nm.
본 발명의 바람직한 양태에 따르면, 상기 경화성 수지는 UV 경화 반응에 의해 패턴을 형성할 수 있는 종류의 수지를 사용할 수 있으며 아크릴계 수지, 메타아크릴계 수지, 폴리비닐계 수지, 폴리에스테르계 수지, 스티렌계 수지, 알키드계 수지, 아미노계 수지, 폴리우레탄계 수지 및 실리콘계 수지를 포함하는 그룹으로부터 선택된 1종 이상인 것이 바람직하다. According to a preferred embodiment of the present invention, the curable resin may be a resin of a type capable of forming a pattern by UV curing reaction, acrylic resin, methacrylic resin, polyvinyl resin, polyester resin, styrene resin It is preferable that it is 1 or more types chosen from the group containing alkyd resin, amino resin, polyurethane resin, and silicone resin.
이때, 보다 구체적인 경화성 수지의 종류로는 불포화폴리에스테르, 메틸메타크릴레이트, 에틸메타크릴레이트, 이소부틸메타크릴레이트, 노말부틸메타크릴레이트, 노말부틸메틸메타크릴레이트, 아크릴산, 메타크릴산, 히드록시에틸메타크릴레이트, 히드록시프로필메타크릴레이트, 히드록시에틸아크릴레이트, 아크릴아미드, 메티롤아크릴아미드, 글리시딜메타크릴레이트, 에틸아크릴레이트, 이소부틸아크릴레이트, 노말부틸아크릴레이트, 2-에틸헥실아크릴레이트의 단독중합체, 이들의 공중합체 또는 삼원 공중합체 등이 있을 수 있다.At this time, more specific types of curable resins include unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, and hydride. Hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2- Homopolymers of ethylhexyl acrylate, copolymers or terpolymers thereof, and the like.
[정보식별층] [Information identification layer]
본 발명의 바람직한 양태에 따르면, 상기 정보식별층은 홀로그램, 색변환 잉크, 형광물질, 나노 광학렌즈 및 미세문자를 포함하는 그룹으로부터 선택된 1종 이상의 보안요소를 포함하는 것일 수 있다. 본 발명에서 상기 정보 식별층을 구성하는 보안요소는 통상적인 방법에 따라 제조된 것일 수 있으며, 사용되는 용도에 따라 복수의 보안요소를 동시에 포함한 다층구조일 수 있다.According to a preferred embodiment of the present invention, the information identification layer may include one or more security elements selected from the group consisting of holograms, color conversion inks, fluorescent materials, nano-optical lenses and micro-letters. In the present invention, the security element constituting the information identification layer may be manufactured according to a conventional method, it may be a multi-layer structure including a plurality of security elements at the same time according to the use.
본 발명에서 상기 홀로그램은 일예로, 홀로그램 원판(shim)을 엠보싱하여 홀로그램 효과를 부과한 후 알루미늄 금속을 약 20 내지 100㎚ 정도로 증착시킨 반사형 홀로그램 금속층 및 상기 반사형 홀로그램 금속층 상부에 폴리에스테르, PMMA(Polymethylmethacrylate), 폴리아미드, 폴리카보네이트, 셀룰로오스계 에스테르 및 폴리아세탈 수지 등으로부터 선택된 소재로 형성된 보호층이 2 내지 6㎛ 두께로 적층된 기본 구조를 포함할 수 있다.In the present invention, the hologram is, for example, the embossed hologram disc (shim) and impart a hologram effect, and then a reflective holographic metal layer deposited on aluminum metal about 20 to 100 nm and polyester, PMMA on the reflective holographic metal layer A protective layer formed of a material selected from polymethylmethacrylate, polyamide, polycarbonate, cellulose ester, polyacetal resin, and the like may include a basic structure having a thickness of 2 to 6 μm.
또한, 상기 보호층 상부에 왁스, 실리콘 왁스, 불화탄소 수지, 실리콘 수지 등으로 이루어진 이형층과 상기 이형층 상부에 폴리에스테르, 폴리아크릴레이트, 폴리카보네이트, 셀루로오스 에스테르, 폴리아세탈 및 폴리아미드 등으로부터 선택된 1종 이상의 캐리어 필름층이 추가적으로 적층 될 수 있으며, 상기 반사형 홀로그램 금속층 하부에는 아크릴수지, 에폭시 수지, 비닐수지, 폴리이미드, 폴리에스터 수지, 우레탄 수지 중에서 선택된 1 종 이상의 접착제 층이 형성될 수 있다.In addition, a release layer made of wax, silicon wax, fluorocarbon resin, silicone resin, etc. on the protective layer and polyester, polyacrylate, polycarbonate, cellulose ester, polyacetal, polyamide, etc., on the release layer. One or more carrier film layers selected from may be further laminated, and at least one adhesive layer selected from acrylic resin, epoxy resin, vinyl resin, polyimide, polyester resin, and urethane resin may be formed under the reflective holographic metal layer. Can be.
본 발명에서 상기 정보 식별층의 보안요소로 색변환 잉크를 적용할 경우, 폴리에스터 수지에 색변환 물질로서 펄안료 가령, MERCK사 제품인 Iriodin Red, Blue, Green 등을 혼합하여 박막의 필름을 형성하여 사용할 수 있다. 이때, 상기 폴리에스터 수지는 크랙현상을 방지하고 색변환 효과를 극대화하기 위하여 분자량이 21,000 내지 26,000인 것이 바람직하며, 색변환 물질은 수지층 표면의 광택도와 평활도를 고려하여 평균 입경이 5 내지 25㎛ 인 것이 바람직하다.In the present invention, when applying the color conversion ink as a security element of the information identification layer, by mixing a pearl pigment, for example, Iriodin Red, Blue, Green, etc. manufactured by MERCK as a color conversion material to the polyester resin to form a thin film Can be used. In this case, the polyester resin preferably has a molecular weight of 21,000 to 26,000 in order to prevent cracking and maximize the color conversion effect, the color conversion material is 5 to 25㎛ average particle diameter in consideration of the gloss and smoothness of the surface of the resin layer Is preferably.
한편, 본 발명에서는 상기 정보 식별층의 보안요소로서, 가시광선(380 내지 780nm)하에서는 투명하되 비가시광선의 파장에서는 특정 색상을 발현하는 이른바 형광물질을 선택하여 적용하는 것도 가능하다. 바람직한 형광물질로는 유기 황화물(organic phosphors)을 선택할 수 있으며 형광물질을 폴리에스테르 등의 수지와 혼합하여 투명 증착층 위에 인쇄한 후, 열풍 등에 의해 건조함으로써 형광체 인쇄부를 형성하여 정보 식별층으로 사용할 수 있다.In the present invention, as the security element of the information identification layer, it is also possible to select and apply a so-called fluorescent material that is transparent under visible light (380 to 780 nm) but expresses a specific color at a wavelength of invisible light. Organic phosphors may be selected as a preferable phosphor, and the phosphor may be mixed with a resin such as polyester and printed on a transparent deposition layer, and then dried by hot air to form a phosphor printing unit to be used as an information identification layer. have.
나아가, 배경패턴에 점선 또는 망점을 밀집시킨 형태로 배치하여 14 내지 18%의 농도를 같는 스크린 톤을 형성하고, 가로 0.25 내지 0.30㎜, 세로 0.25 내지 0.30㎜ 및 간격 0.20 내지 0.29㎜의 미세문자를 삽입함으로써 현혹효과로 인해 확대경으로 확인시에만 식별가능한 보안요소를 적용할 수도 있다. 이때, 상기 미세문자의 농도는 스크린 톤의 농도보다 2 내지 3%정도로만 진하게 하는 것이 복사나 출력을 통해 재현이 불가능하게 할 수 있으나, 상기 스크린 농도 및 미세문자의 크기는 반드시 이에 한정되는 것은 아니다.Further, by arranging the dotted pattern or dotted dots in the background pattern to form a screen tone having the same concentration of 14 to 18%, fine characters of 0.25 to 0.30 mm horizontal, 0.25 to 0.30 mm vertically and 0.20 to 0.29 mm spacing. By inserting the dazzle effect, the identifiable security element can be applied only when confirmed by the magnifying glass. At this time, the concentration of the fine text is only 2 to 3% thicker than the density of the screen tone may be impossible to reproduce through copying or output, the screen density and the size of the fine text is not necessarily limited thereto.
이 밖에도 본 발명의 상기 보안요소는 상술한 요소들에 제한되지 않고, 용지의 제조과정에서 특정부위에 문양이나 문자를 넣어 투과광(transmitted light)에서 동 문양이나 문자를 볼 수 있도록 만든 보안요소인 은화(Watermark) 및　용지에 삽입한 얇은 선형 필름으로 반사광에서는 잘 볼 수 없으나 투과광에서는 선명하게 식별할 수 있는 보안요소인 은선(Security thread)도 적용할 수 있다. 또한, 요판 잉크(Intaglio Ink), 자성 잉크(Magnetic Ink), 적외선 잉크(Infrared Ink), 색변환 잉크(CSI: Color-Shifting Ink) 및 메타메릭 잉크 쌍(Metameric Ink Pair) 등의 특수 잉크도 적용 대상이 될 수 있으며, Seegram®(㈜렌텍코리아)과 같은 나노광학렌즈 등을 적용할 수도 있다.In addition, the security element of the present invention is not limited to the above-described elements, a silver coin that is a security element made to see the pattern or characters in the transmitted light (transmitted light) by inserting a pattern or a character on a specific part in the manufacturing process of the paper It is a thin linear film inserted in watermark and paper, and it is hard to see in reflected light, but security thread, which is clearly visible in transmitted light, can also be applied. In addition, special inks such as Intaglio Ink, Magnetic Ink, Infrared Ink, Color-Shifting Ink (CSI), and Metameric Ink Pair are also applied. It can be a target, and nano-optic lenses such as Seegram® can be applied.
이하, 실시예를 통하여 본 발명을 더욱 상세히 설명하고자 한다. 이들 실시예는 오로지 본 발명을 보다 구체적으로 설명하기 위한 것으로서, 이에 의해 본 발명이 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention more specifically, and the present invention is not limited thereto.
대조군. 일반 홀로그램 필름 Control. Plain hologram film
PET 필름의 일면에 코오롱 마크의 홀로그램을 UV경화 수지로 임프린팅하여 홀로그램 패턴을 형성하여 대조군을 준비하였다.The hologram of the Kolon mark on one surface of the PET film was imprinted with a UV curing resin to form a hologram pattern to prepare a control group.
실시예 1. 홀로그램을 정보식별층으로 갖는 보안필름 Example 1. Security film with hologram as information identification layer
상기 대조군과 동일한 방법으로 PET 필름의 일면에 코오롱 마크의 홀로그램을 UV경화 수지로 임프린팅하여 홀로그램 패턴을 형성한 다음, 홀로그램 패턴이 형성되지 않은 PET 필름의 다른 일면에 UV경화 수지를 이용하여 피치 100nm, 선폭 50nm, 높이 100nm의 패턴을 임프린팅하여 격자 패턴을 형성하였다. 마지막으로 알루미늄을 상기 격자패턴에 50nm 증착을 하여 도 1과 같은 단면구조를 갖는 WGP 층을 형성하였다. The hologram pattern was formed by imprinting the hologram of the Kolon mark on one surface of the PET film with a UV curing resin in the same manner as the control group, and then using a UV curing resin on the other side of the PET film on which the hologram pattern was not formed. The lattice pattern was formed by imprinting a pattern having a line width of 50 nm and a height of 100 nm. Finally, 50 nm of aluminum was deposited on the lattice pattern to form a WGP layer having a cross-sectional structure as shown in FIG. 1.
실시예 2. 홀로그램과 미세문자를 정보식별층으로 갖는 보안필름 Example 2. Security film with hologram and fine character as information identification layer
상기 실시예 1과 동일한 방법으로 제조한 보안필름의 일면에 미세문자를 프린트한 필름을 한층 더 적층시켜 실시예 2를 제조하였다.Example 2 was prepared by further laminating a film printed with fine characters on one surface of the security film prepared in the same manner as in Example 1.
실시예 3. 홀로그램과 나노광학렌즈를 정보식별층으로 갖는 보안필름 Example 3 Security Film Having Hologram and Nano Optical Lens as Information Identification Layer
상기 실시예 1과 동일한 방법으로 제조한 보안필름의 일면에 Seegram®(㈜렌텍코리아)을 한층 더 적층시켜 실시예 3을 제조하였다.Example 3 was prepared by further laminating Seegram® (Rentec Korea) on one surface of the security film manufactured in the same manner as in Example 1.
상기 제조한 대조군 및 실시예 1 내지 3을 A4용지 위에 두고, 각도를 변화 시켜가며 보안요소들이 관찰되는지를 평가하여 하기 표 1에 나타내었다.The prepared control and Examples 1 to 3 were placed on A 4 paper, and evaluated by changing the angle to observe the security factors are shown in Table 1 below.
표 1
대조군 실시예 1 실시예 2 실시예 3
투과모드 홀로그램만 관찰 홀로그램 관찰되지 않음 미세문자 관찰 나노광학렌즈 관찰
반사모드 홀로그램 관찰 미세문자, 홀로그램 모두 관찰 나노광학렌즈, 홀로그램 모두 관찰
Table 1
Control Example 1 Example 2 Example 3
Transmission mode Observe only hologram Hologram not observed Fine character observation Nano Optical Lens Observation
Reflection mode Hologram observation Observe both fine text and hologram Observe both nano-optical lens and hologram
표 1에 반영된 결과와 같이 나노 와이어 그리드 편광층이 형성된 실시예 1 내지 3의 경우, 필름의 각도에 따라 투과 모드와 반사 모드가 설정됨에 따라 도 8에 나타난 것처럼 홀로그램이 사라졌다 나타나고, 또다시 사라졌다 하는 것을 관찰할 수 있었다. 이와 같이 본 발명의 보안필름은 하나의 필름을 통해서 보안요소가 다채로워지고 가변화될 수 있어 일반적인 보안 요소에 비해 보안기능이 월등히 우수한 것으로 판단되었다. In Examples 1 to 3 in which the nanowire grid polarization layer was formed as shown in Table 1, the hologram disappeared and disappeared again as shown in FIG. 8 as the transmission mode and the reflection mode were set according to the angle of the film. I could observe that I lost. As described above, the security film of the present invention can be diversified and variable through a single film, so that the security function is superior to the general security element.

Claims (6)

  1. 기재층;Base layer;
    선 격자 패턴을 포함하는 나노 와이어 그리드 편광층; 및A nanowire grid polarizing layer comprising a line grid pattern; And
    1 이상의 정보 식별층을 포함하되,Include at least one information identification layer,
    상기 기재층과 접하는 외측면, 기재층과 나노 와이어 그리드 편광층 사이의 내측면 및 나노 와이어 그리드 편광층과 접하는 외측면 중 적어도 하나의 위치에 정보 식별층이 1 이상 존재하도록 상기 기재층, 나노와이어 그리드 편광층 및 정보식별층이 적층된 보안필름.The base layer and the nanowire so that at least one information identification layer is present at at least one of an outer side contacting the base layer, an inner side surface between the base layer and the nanowire grid polarization layer, and an outer side surface contacting the nanowire grid polarization layer. Security film with lamination of grid polarization layer and information identification layer.
  2. 제 1 항에 있어서, 상기 나노 와이어 그리드 편광층의 선 격자 패턴은 하기 특성을 만족하는 것을 특징으로 하는 보안필름:The security film of claim 1, wherein the line grid pattern of the nanowire grid polarization layer satisfies the following characteristics:
    (a) 선 격자의 높이: 25 내지 300nm;(a) line grating height: 25-300 nm;
    (b) 선 격자의 선폭: 5 내지 75 nm;(b) line width of line lattice: 5-75 nm;
    (c) Aspect(선 격자의 높이/선폭) ratio: 0.1 내지 3.0; 및(c) Aspect (height / line width of line grid) ratio: 0.1 to 3.0; And
    (d) 선 격자의 피치(pitch): 50 내지 150nm.(d) Pitch of line lattice: 50-150 nm.
  3. 제 1 항에 있어서, 상기 선 격자 패턴은 알루미늄, 구리, 크롬, 백금, 금, 은, 니켈 및 이들의 합금을 포함하는 그룹으로부터 선택된 어느 하나의 금속 입자를 포함하는 것을 특징으로 하는 보안필름.The security film of claim 1, wherein the line lattice pattern comprises any one of metal particles selected from the group consisting of aluminum, copper, chromium, platinum, gold, silver, nickel, and alloys thereof.
  4. 제 1 항에 있어서, 상기 선 격자 패턴은 금속 입자 단독으로 형성된 패턴; 내부에 금속입자가 포함된 경화성 수지로 형성된 패턴; 및 경화성 수지로 형성된 하부 골격 상부에 금속 입자가 10 내지 300 nm의 높이로 적층되어 형성된 패턴 중 어느 하나의 구조를 갖는 패턴임을 특징으로 하는 보안필름.According to claim 1, wherein the line grid pattern is a pattern formed of metal particles alone; A pattern formed of a curable resin including metal particles therein; And a pattern having a structure of any one of patterns formed by stacking metal particles at a height of 10 to 300 nm on an upper portion of a lower skeleton formed of a curable resin.
  5. 제 4 항에 있어서, 상기 경화성 수지는 아크릴계 수지, 메타아크릴계 수지, 폴리비닐계 수지, 폴리에스테르계 수지, 스티렌계 수지, 알키드계 수지, 아미노계 수지, 폴리우레탄계 수지 및 실리콘계 수지를 포함하는 그룹으로부터 선택된 1종 이상인 것임을 특징으로 하는 보안필름.The method of claim 4, wherein the curable resin is selected from the group consisting of acrylic resins, methacryl resins, polyvinyl resins, polyester resins, styrene resins, alkyd resins, amino resins, polyurethane resins and silicone resins. Security film, characterized in that at least one selected.
  6. 제 1 항에 있어서, 상기 기재층은 폴리에틸렌테레프탈레이트 필름, 폴리카보네이트 필름, 폴리프로필렌 필름, 폴리에틸렌 필름, 폴리스티렌 필름, 폴리에폭시 필름, 고리형 올레핀계 중합체(COP) 필름, 고리형 올레핀계 공중합체(COC) 필름, 폴리카보네이트계 수지와 고리형 올레핀계 중합체의 공중합체 필름 및 폴리카보네이트계 수지와 고리형 올레핀계 공중합체의 공중합체 필름을 포함하는 그룹으로부터 선택된 어느 하나의 투명 필름이거나, 또는 유리 필름인 것을 특징으로 하는 보안필름.The method of claim 1, wherein the substrate layer is polyethylene terephthalate film, polycarbonate film, polypropylene film, polyethylene film, polystyrene film, polyepoxy film, cyclic olefin polymer (COP) film, cyclic olefin copolymer ( COC) film, a copolymer film of a polycarbonate resin and a cyclic olefin polymer and a transparent film selected from the group comprising a copolymer film of a polycarbonate resin and a cyclic olefin copolymer, or a glass film Security film characterized in that the.
PCT/KR2015/009426 2014-09-05 2015-09-07 Security film WO2016036223A1 (en)

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US15/505,956 US20180217308A1 (en) 2014-09-05 2015-09-07 Security film
CN201580047453.2A CN106796316A (en) 2014-09-05 2015-09-07 Safety diaphragm
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CN111484643B (en) * 2020-03-20 2022-04-26 江苏大学 Self-supporting MnO2Nanowire imprinted membrane and preparation method and application thereof

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