KR100407253B1 - Ink having the metachrosis and changing the color by oxidation and the use thereof - Google Patents
Ink having the metachrosis and changing the color by oxidation and the use thereof Download PDFInfo
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- KR100407253B1 KR100407253B1 KR10-2000-0084955A KR20000084955A KR100407253B1 KR 100407253 B1 KR100407253 B1 KR 100407253B1 KR 20000084955 A KR20000084955 A KR 20000084955A KR 100407253 B1 KR100407253 B1 KR 100407253B1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/50—Sympathetic, colour changing or similar inks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/07—Aldehydes; Ketones
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
- C09D11/037—Printing inks characterised by features other than the chemical nature of the binder characterised by the pigment
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Abstract
본 발명은 산화 발색형 변색 잉크 및 이의 사용방법에 관한 것으로, 좀 더 상세하게는 산화 발색형 안료와 비가시 형광물질을 함유하는 산화 발색형 변색 잉크 및 이를 유가증권류의 액면, 여권의 신원정보 및 사증란, 특수문서 등에 위·변조 방지를 위해 사용하는 방법에 관한 것이다. 본 발명에 따라 제조된 제품은 위·변조를 위해 잉크 지우개 또는 표백액을 사용할 경우에, 제품이 무색에서 황갈색으로 변색되고, 자외선 조사시에는 변조된 부위가 형광고유의 색상이 발광하지 않기 때문에, 육안 또는 기기에 의해 위·변조 사실을 쉽게 확인할 수 있다.The present invention relates to an oxidative color fading ink and a method of using the same, and more particularly, to an oxidative color fading ink containing an oxidative color pigment and an invisible fluorescent substance, and the face value of securities, and identification information of a passport. And a visa relates to a method used for preventing forgery and alteration in a special document or the like. When the product manufactured according to the present invention uses an ink eraser or bleach solution for forgery and alteration, the product discolors from colorless to yellowish brown, and when the UV light is irradiated, the modulated portion does not emit a unique fluorescence color. It is easy to check the forgery and alteration by the naked eye or the device.
Description
본 발명은 산화 발색형 변색 잉크 및 이의 사용방법에 관한 것으로, 좀 더 상세하게는 산화 발색형 안료와 비가시 형광물질을 함유하는 산화 발색형 변색 잉크 및 이를 유가증권류의 액면, 여권의 신원정보 및 사증란, 특수문서 등에 위·변조 방지를 위해 사용하는 방법에 관한 것이다.The present invention relates to an oxidative color fading ink and a method of using the same, and more particularly, to an oxidative color fading ink containing an oxidative color pigment and an invisible fluorescent substance, and the face value of securities, and identification information of a passport. And a visa relates to a method used for preventing forgery and alteration in a special document or the like.
종래부터 유가증권류, 여권 신원정보 및 사증란, 특수문서 등의 위·변조를 방지하기 위한 방안으로 여러가지 특수요소들이 사용되어 오고 있으나, 유가증권류의 액면기재 또는 여권 신원정보 및 사증란, 특수문서 등의 중요 부위의 기재사항 등을 잉크 지우개 또는 표백액을 사용하여 변조함으로써 전문가도 진위를 식별하기가 어려운 실정이다. 또한, 첨단기술의 발달로 복사, 스캐너 등에 의해 복사 위조도 심각해지고 있는 실정이다.Conventionally, various special elements have been used to prevent forgery and alteration of securities, passport identity information and visa columns, and special documents.However, the face value of securities or passport identity information and visa columns, special documents, etc. It is difficult for an expert to identify the authenticity by modifying the description of important parts of the ink using an ink eraser or bleach solution. In addition, due to the development of high technology, copying and forgery by the copying, scanner, etc. are also serious.
이러한 위·변조를 방지하기 위해 다양한 방법들이 연구 개발되고 있고, 예를 들어, 마찰이나 열에 의해 50∼70℃정도로 가열되면 잉크의 색상이 순간적으로 소멸되고 열원이 제거되면 원래의 색상으로 복원되는 특징을 갖는 잉크 등이 개발되었다. 이러한 감열 변색 효과를 나타내는 재료로서, 액정, 유무기계 물질 등이 제조되어 산업용 도료 또는 팜플렛, 스티커 등에 일부 사용되고 있음은 이미 알려져 있다.Various methods have been researched and developed to prevent such forgery and alteration. For example, when heated to about 50 ~ 70 ℃ by friction or heat, the color of ink disappears instantaneously, and the original color is restored when the heat source is removed. Inks and the like have been developed. As a material exhibiting such a thermochromic effect, it is already known that liquid crystals, organic and non-mechanical materials, and the like are used and partially used in industrial paints, pamphlets, stickers and the like.
아울러, 한국 특허공고 제91-9220호에는, 유가증권용 평판 및 활판용 감열 가역 변색형 잉크의 제조방법이 기재되어 있으나, 유가증권류의 액면, 신분증의 신원정보 및 사증란의 중요부분 등의 변조시에는 변색되지 않아 진위식별용으로 적합하지 않은 문제점이 있다.In addition, Korean Patent Publication No. 91-9220 describes a method for producing a flat plate and a type of thermally reversible discoloration ink for securities, but it modifies the face value of the securities, identification information of an identification card, and important parts of a visa column. There is a problem that is not suitable for authenticity since it does not discolor when poems.
또한, 이러한 문제점을 해결하기 위하여 한국 특허공고 제94-6148호에서 알 수 있는 바와 같이, 화공약품의 지시약을 이용하여 발색 수성 인쇄용 잉크 조성물을 개발하였으나, 내약품성(산, 알카리), 내용제성(에틸알콜, 아세톤, 벤젠, 1,1,1-트리클로로에탄), 내석검성(5% 비누물, 80℃ 가열) 및 내광성 등의 내구성이 미흡하여 유가증권류, 여권의 신원정보 및 사증란, 특수문서 등에서 그 기능이 미흡한 문제점이 있었다.In addition, in order to solve such a problem, as disclosed in Korean Patent Publication No. 94-6148, a color printing aqueous ink composition was developed using an indicator of a chemical agent, but chemical resistance (acid, alkali), solvent resistance ( Insufficient durability such as ethyl alcohol, acetone, benzene, 1,1,1-trichloroethane), stone gum resistance (5% soap, 80 ℃ heating), and light resistance, etc. There was a problem that the function is insufficient in the document.
한편, 자외선 안정제 또는 흡수제로 통상적으로 사용되는 벤조페논은 자외선 흡수효과가 매우 우수하여 플라스틱, 접착제, 코팅제, 페인트, 화장품 등에 첨가제로서 널리 이용되고 있는데, 예를 들어, 한국 특허공고 제95-5379호에는 염화아연 및 폴리인산의 촉매하에서 옥시염화인을 용매로 사용하고 벤조산과 레조르시노올(resorcinol)을 반응시켜 벤조페논 유도체를 제조하는 방법이 기재되어 있다. 이러한 벤조페논을 이용하여 광변색성 잉크 조성물을 제조하는 방법이 한국 공개특허 제95-14245호에 기재되어 있는데, 상기 잉크 조성물은 스피로계 화합물을 에폭시 수지에 용해시키고 여기에 부틸셀루솔부를 더욱 적가하면서 용해시키며, 자외선 안정제로서 소량의 시아솔브, 타누빈, 벤조페논, 또는 아민계 화합물들을 더욱 첨가하여 제조하였다. 그러나, 이러한 조성물은 유가증권류, 신분증 등의 위·변조에 사용하기에 적합하지 않았다.On the other hand, benzophenones commonly used as UV stabilizers or absorbers have excellent UV absorption effects and are widely used as additives in plastics, adhesives, coatings, paints, and cosmetics. For example, Korean Patent Publication No. 95-5379 Described is a process for preparing benzophenone derivatives by using phosphorus oxychloride as a solvent and reacting benzoic acid with resorcinol under a catalyst of zinc chloride and polyphosphoric acid. A method of manufacturing a photochromic ink composition using such benzophenone is described in Korean Patent Application Laid-Open No. 95-14245, which dissolves a spiro-based compound in an epoxy resin and further adds a butylcellulose unit to the butyl cellulose unit. It was dissolved while dissolving, and was prepared by further adding a small amount of cyasorb, tanuvin, benzophenone, or an amine compound as an ultraviolet light stabilizer. However, these compositions are not suitable for use in forgery and alteration of securities, identification cards and the like.
따라서, 본 발명의 목적은 전술한 종래기술의 문제점을 해결하고, 새로운 위·변조의 대응방법으로서 산화에 의한 발색성을 갖는 벤조페논계 안료를 포함하고, 비가시 형광물질을 포함하는 산화 발색형 변색잉크를 제공하는데 있다.Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and as a countermeasure for novel forgery and alteration, an oxidative color change type including a benzophenone-based pigment having color development by oxidation and including an invisible fluorescent substance. To provide ink.
본 발명의 다른 목적은, 상기 산화 발색형 변색잉크를 사용하는 방법을 제공하는데 있다.It is another object of the present invention to provide a method of using the chromophoric color changing ink.
상기 목적을 달성하기 위한 본 발명의 산화 발색형 변색잉크는 벤조페논계 안료 25∼50중량%, 비가시 형광물질 2∼15중량%, 바니시 30∼55중량% 및 건조제 1∼8중량%로 이루어진다.The oxidative color changing ink of the present invention for achieving the above object consists of 25 to 50% by weight of benzophenone-based pigment, 2 to 15% by weight of invisible fluorescent substance, 30 to 55% by weight of varnish and 1 to 8% by weight of desiccant. .
또한 본 발명의 다른 목적을 달성하기 위해 전술한 산화 발색형 변색잉크를 유가증권류의 액면, 여권의 신원정보 및 사증란, 특수문서 등의 위·변조 방지를 위해 사용하는 것을 특징으로 한다.In addition, in order to achieve the other object of the present invention, the above-described chromophoric color change ink is used for preventing forgery and alteration of the face value of securities, identity information and visa column of a passport, and special documents.
이하, 본 발명을 좀 더 구체적으로 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail.
전술한 바와 같이, 본 발명에 따른 잉크는 벤조페논계 안료, 비가시 형광물질, 바니시 및 건조제를 포함한다.As mentioned above, the ink according to the invention comprises a benzophenone-based pigment, an invisible phosphor, a varnish and a desiccant.
상기 벤조페논계 안료는 산화 발색성 안료로서, 염화아연의 촉매하에서 벤조니트릴(benzonitrile) 10∼35중량% 및 레조르시노올 5∼20중량%를 에테르에 용해시키고 건조 염화수소 가스를 통과시켜 얻어진 생성물에 물을 첨가하여 가수분해시킴으로써 얻을 수 있다. 사용하는 벤조니트릴의 함량이 10중량% 미만이면 잉크지우개 또는 표백액 사용시 변색효과가 미흡하게 되며, 35중량%를 초과하면 벤조페논계 안료 제조상 문제점이 발생하게 된다. 이렇게 제조된 벤조페논계 안료는 특유의 자외선 흡수효과로 인해 산화 발색성을 갖는다. 또한, 본 발명에 따른 벤조페논계 안료는 25∼50중량%로 사용하는 것이 바람직한데, 벤조페논계 안료를 25중량% 미만으로 사용하게 되면 잉크지우개 또는 표백액 사용 변조시 변색효과가 미흡하게 되고, 50중량%를 초과하여 사용하게 되면 변색 잉크제조시 인쇄적성이 미흡하게 된다.The benzophenone pigments are oxidatively chromogenic pigments, in which 10 to 35% by weight of benzonitrile and 5 to 20% by weight of resorcinool are dissolved in ether and passed through a dry hydrogen chloride gas under a catalyst of zinc chloride. It can be obtained by adding water to hydrolysis. If the content of the benzonitrile to be used is less than 10% by weight, the discoloration effect is insufficient when the ink eraser or bleach solution is used, and when it exceeds 35% by weight, problems in manufacturing the benzophenone-based pigment are generated. The benzophenone-based pigments thus prepared have oxidative color development due to the unique ultraviolet absorption effect. In addition, the benzophenone pigment according to the present invention is preferably used at 25 to 50% by weight. When the benzophenone pigment is used at less than 25% by weight, the discoloration effect is insufficient when the ink eraser or the bleach is used. If it is used in excess of 50% by weight, printability is insufficient when manufacturing discolored ink.
본 발명에서 사용할 수 있는 비가시 형광물질은 벤족사지논 유도체이며, 하니웰(Honeywell)사의 루미룩스(lumilux CD 402, 702 및 704)로 이루어진 군으로부터 선택되지만, 이에 한정되는 것은 아니다. 상기 비가시 형광물질을 2중량% 미만으로 사용하는 경우에는 자외선 조사시 형광물질의 발광 효과가 미흡하게 나타나는 문제가 있으며, 15중량%를 초과하는 경우에는 인쇄시 잉크 퇴적 현상이 발생하는 문제가 있다. 이렇게 첨가되는 형광물질에 의해 본 발명에 따른 잉크에 자외선을 조사하면 형광특성이 발현됨으로써 위·변조를 예방할 수 있다.The invisible fluorescent substance that can be used in the present invention is a benzoxazinone derivative, and is selected from the group consisting of honeywell (lumilux CD 402, 702 and 704), but is not limited thereto. When the invisible fluorescent substance is used at less than 2% by weight, there is a problem in that the luminous effect of the fluorescent substance is insufficient when irradiated with ultraviolet rays, and when it exceeds 15% by weight, there is a problem that ink deposition occurs during printing. . When the ink according to the present invention is irradiated with ultraviolet rays by the fluorescent material added as described above, fluorescence characteristics are expressed, thereby preventing forgery and alteration.
또한, 본 발명에 사용되는 바니시(varnish), 특히 평판 잉크제조용 바니시의 통상적인 제조방법을 살펴보면, 이에 한정되는 것은 아니지만 P-알킬 페놀수지 또는 비스페놀 A와 포름알데히드로부터 페놀수지의 초기 축합물을 얻고, 이것을 송진과 반응시켜 페놀수지의 메틸롤기를 송진의 이중 결합부분과 반응시킨 다음, 이 수지의 카르복실기를 글리세린 또는 펜타에리스리톨과 같은 폴리올에서 에스테르화하여 로진 변성 페놀수지로 제조하고, 이를 아마인유, 아주까리유, 알키드수지, 탄화수소용제 등에 용해시켜서 제조하게 된다. 상기 바니시의 함량이 30중량% 미만이면 인쇄 잉크제조 적성이 미흡하며, 55중량%를 초과하면 인쇄적성이 미흡한 문제가 있다.In addition, when looking at the conventional varnish (varnish) used in the present invention, in particular, the varnish for preparing flat ink, but not limited to this to obtain the initial condensation of the phenol resin from P-alkyl phenol resin or bisphenol A and formaldehyde This is reacted with rosin to react the methylol group of the phenol resin with the double bond portion of the rosin, and then the carboxyl group of the resin is esterified in a polyol such as glycerin or pentaerythritol to prepare a rosin-modified phenolic resin. It is prepared by dissolving in castor oil, alkyd resin, and hydrocarbon solvent. When the content of the varnish is less than 30% by weight, the printing ink manufacturing aptitude is insufficient, and when the content of the varnish exceeds 55% by weight, the printability is insufficient.
또한, 본 발명에 사용되는 건조제로는 망간, 코발트 드라이어를 들 수 있으며, 1중량% 미만으로 첨가하면 인쇄시 건조가 늦어 뒤묻음 현상이 발생하게 되며, 8중량%를 초과하여 첨가하면 인쇄시 잉크의 건조가 빨라서 인쇄부위가 정확하게 인쇄되지 않는 현상이 발생하게 된다.In addition, the desiccant used in the present invention include manganese, cobalt dryers, when less than 1% by weight of the drying occurs late printing during printing, the addition of more than 8% by weight ink when printing Due to the fast drying, the printing area may not be printed correctly.
전술한 방법에 의해 제조된 본 발명에 따른 산화 발색형 변색잉크를 유가증권류의 액면, 여권 등의 신분증의 신원정보 및 사증란, 위변조 확인이 요구되는 진위식별이 가능한 특수문서 등에 평활판 인쇄방식을 이용하여 적용한다. 이렇게 얻어진 최종 제품들은 변조를 위해 잉크 지우개 또는 표백액을 사용할 경우, 색상이 무색에서 황갈색으로 변색되고 또한 변조한 부분은 자외선 조사시 형광효과가 소실됨으로써, 위·변조 여부를 육안 또는 기기를 통해 쉽게 확인할 수 있다.The oxidation-colored discoloration ink according to the present invention manufactured by the above-described method is used for the flat printing method for the identification information of the identity card such as the face value of the securities, the passport and the like, and the special document capable of authenticity identification requiring forgery verification. To apply. The final products thus obtained are colorless to yellowish brown when the ink eraser or bleach solution is used for modulation, and the modulated portion loses the fluorescence effect when irradiated with ultraviolet light, making it easy to visually and forgery the human eye. You can check it.
이하 실시예를 통해 본 발명을 좀 더 구체적으로 살펴보지만, 하기 예에 본 발명의 범주가 한정되는 것은 아니다.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.
실시예Example
<제1공정><Step 1>
염화아연 30g의 존재하에서 벤조니트릴 30g 및 레조르시노올 30g의 혼합물을 에테르 용매에 용해시키고 상기 원료를 건조 염화수소 가스에 통과시켜 얻어진 생성물에 물 100g을 가하여 가수분해시켜 산화 발색형 벤조페논계 안료를 제조하였다. 이 때 반응은 하기 반응식 1과 같다.In the presence of 30 g of zinc chloride, a mixture of 30 g of benzonitrile and 30 g of resorcinool was dissolved in an ether solvent, and 100 g of water was added to the product obtained by passing the raw material through dry hydrogen chloride gas to hydrolyze the chromophore type benzophenone pigment. Prepared. At this time, the reaction is shown in Scheme 1 below.
<제2공정><Step 2>
P-알킬 페놀수지 30g와 포름알데히드 50g을 혼합하여 페놀수지의 초기 축합물을 만들고, 이것을 송진 40g과 반응시킨 후, 글리세린에서 에스테르화시켜 로진 변성페놀수지를 제조하고, 이를 아마인유에 용해시켜 평판용 바니시를 제조하였다.30g of P-alkyl phenolic resin and 50g of formaldehyde are mixed to make an initial condensate of phenolic resin, which is then reacted with 40g of rosin, and then esterified in glycerin to produce rosin-modified phenolic resin, which is dissolved in linseed oil and plated. A varnish was prepared.
<제3공정><Step 3>
제1공정에서 제조된 산화발색형 안료 44중량%, 하니웰(Honeywell)사의 루미룩스(lumilux) CD 702 6중량%, 제2공정에 의해 제조된 바니시 47중량%, 코발트 드라이어 3중량%를 혼합하여 3롤 밀(3 Roll Mill)로 4∼5회 분산 연육하여 산화 발색형 변색잉크를 제조하였다. 이와 같이 제조된 잉크의 물성은 하기와 같다.44 wt% of the oxidative pigment prepared in the first step, 6 wt% of Lumilux CD 702 from Honeywell, 47 wt% of the varnish prepared by the second step, and 3 wt% of the cobalt dryer Oxidative chromophoric discoloration ink was prepared by dispersing and grinding four to five times with a three roll mill. The physical properties of the ink thus prepared are as follows.
* 유동도 Ф㎝(25℃, 1분): 3.00∼3.30* Flow rate Ф㎝ (25 ℃, 1min): 3.00 ~ 3.30
-> 토요세끼(Toyoseiki)사 스프레드-o-미터(Spread-o-meter)를 이용하여 항온수조를 연결하고 온도는 25℃에서 인쇄잉크의 흐름을 비교측정함.-> Toyooseiki Co., Ltd. Spread-o-meter was used to connect a constant temperature water bath and the temperature was measured at 25 ℃ to compare the flow of printing ink.
* 택크(Tack, 32℃, 50m/분): 80∼100* Tack (Tack, 32 ℃, 50m / min): 80-100
-> 32℃에서 택크-o-스코프(Tack-o-Scope)를 사용하고 잉크피펫으로 정확하게 0.5cc의 잉크를 취하여 로라회전속도 50m/min에서 측정함.-> Use a Tack-o-Scope at 32 ℃ and take an accurate 0.5cc of ink with an ink pipette and measure it at a roller rotation speed of 50m / min.
* 건조시간 : 30∼40시간* Drying time: 30 ~ 40 hours
<제4공정><Step 4>
앞에서 제조된 산화 발색형 잉크를 평·활판인쇄방식을 이용하여 유가증권류의 액면에 적용하였다. 본 발명에 따라 제조된 유가증권에서 변색잉크의 적용부위를 변조하기 위하여 잉크지우개 및 표백액으로 기재 내용을 지운 결과, 색상이 무색에서 황갈색으로 변색되면서 형광효과가 소실되어 위·변조 여부를 쉽게 육안으로 확인할 수 있었고, 변조한 부분을 자외선으로 조사한 결과 동일하게 형광효과가 소실되었음을 확인할 수 있었다.The oxidative color ink prepared above was applied to the liquid level of the securities using the flat printing system. In the securities manufactured according to the present invention, as a result of erasing the contents of the ink with an eraser and a bleach solution in order to modulate the application area of the discoloration ink, the fluorescent effect is lost while the color is changed from colorless to yellowish brown, so that it is easy to visually check whether or not forgery and alteration. As a result of irradiating the modulated portion with ultraviolet rays, it could be confirmed that the same fluorescence effect was lost.
상기 실시예를 통해 알 수 있는 바와 같이, 본 발명에 따른 산화 발색형 변색잉크를 적용하면, 위·변조를 위해 잉크 지우개 또는 표백액을 사용할 경우, 제품이 무색에서 황갈색으로 변색되고 형광색을 잃을 뿐만 아니라, 자외선 조사시에도 변조된 부위는 형광고유의 색상이 발광되지 않기 때문에, 육안 또는 기기에 의한 위·변조 확인이 용이하다.As can be seen through the above embodiment, when the oxidative color fading ink according to the present invention is applied, when the ink eraser or bleach solution is used for forgery and alteration, the product discolors from colorless to yellowish brown and loses fluorescent color. In addition, since the fluorescence-specific color does not emit light in the modulated portion even when irradiated with ultraviolet rays, it is easy to check forgery and alteration by the naked eye or a device.
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| KR101073375B1 (en) * | 2008-12-23 | 2011-10-17 | 한국조폐공사 | Offset printing ink for security printing with machine readable features |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04219266A (en) * | 1990-11-30 | 1992-08-10 | Oji Paper Co Ltd | Ink jet recording paper |
| JPH06166264A (en) * | 1992-11-30 | 1994-06-14 | New Oji Paper Co Ltd | Recording sheet |
| JPH1158929A (en) * | 1997-08-25 | 1999-03-02 | Dainichiseika Color & Chem Mfg Co Ltd | Duplication preventive recording method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04219266A (en) * | 1990-11-30 | 1992-08-10 | Oji Paper Co Ltd | Ink jet recording paper |
| JPH06166264A (en) * | 1992-11-30 | 1994-06-14 | New Oji Paper Co Ltd | Recording sheet |
| JPH1158929A (en) * | 1997-08-25 | 1999-03-02 | Dainichiseika Color & Chem Mfg Co Ltd | Duplication preventive recording method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101073375B1 (en) * | 2008-12-23 | 2011-10-17 | 한국조폐공사 | Offset printing ink for security printing with machine readable features |
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