KR20020031874A - secret ink composition and color former composition thereof - Google Patents
secret ink composition and color former composition thereof Download PDFInfo
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- KR20020031874A KR20020031874A KR1020000062636A KR20000062636A KR20020031874A KR 20020031874 A KR20020031874 A KR 20020031874A KR 1020000062636 A KR1020000062636 A KR 1020000062636A KR 20000062636 A KR20000062636 A KR 20000062636A KR 20020031874 A KR20020031874 A KR 20020031874A
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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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- 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
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
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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
- C09D11/033—Printing inks characterised by features other than the chemical nature of the binder characterised by the solvent
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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
- C09D11/10—Printing inks based on artificial resins
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Abstract
Description
본 발명은, 비밀잉크 조성물 및 그 발색 조성물에 관한 것으로, 더 상세하게는 위조방지, 보안, 인증을 위해 적용되기에 적합하도록 인쇄시 보이지 아니하는 비밀잉크 조성물과, 그 비밀잉크로 인쇄된 기호, 문자, 도형 등을 발색되도록 하는 그 비밀잉크의 발색 조성물에 관한 것이다.The present invention relates to a secret ink composition and a color developing composition, and more particularly, a secret ink composition which is invisible in printing so as to be suitable for application for anti-counterfeiting, security, and authentication, symbols printed with the secret ink, It relates to a color composition of the secret ink for color development of letters, figures, and the like.
종래, 지폐, 수표, 상품권 등에 위조를 방지하기 위해 다양한 기술이 개발되어 있다. 그 예를 들면, 복사가 잘 안되도록 기호, 문자, 도형 등을 표시하거나, 편광물질을 이용하여 인쇄하는 것도 개발되어 있다. 또한, 별도의 위조방지 코팅을 하거나, 자기기록매체로 기호, 문자, 도형 등을 표시하여 위조여부를 판별하기도 한다.Conventionally, various techniques have been developed to prevent forgery in bills, checks, gift certificates, and the like. For example, it has been developed to display a symbol, a character, a figure, etc., or to print using a polarizing material so that copying is difficult. In addition, a separate anti-counterfeiting coating may be applied, or a symbol, character, or figure may be displayed on a magnetic recording medium to determine whether the forgery is performed.
또, 특허출원 제1996-045650호(특허출원공개번호 제1998-027003호)로 출원되어 공개된 비가시 발광물질 및 그 제조 방법에 의하면, 이트륨(Yttrium)화합물, 실리콘(Silicon) 화합물 및 바나듐(Vanadium) 화합물의 산화물을 매트릭스로 하고, 이에 활성화제로서 Nd2O3과 Er2O3을 첨가하여 균일 혼합하고, 1단계 반응으로 산화성분위기에서 600-700℃로 3-5시간 소성 시킨 후 직경이 5-15㎛ 정도가 되게 분쇄하며, 2단계 반응으로 이 분쇄물을 1000-1200℃로 3-5시간 소성시킨후 직경 2-4㎛ 정도의 크기로 분쇄하고, 3단계 반응으로 2단계 반응물을 500-700℃에서 1-3시간 정도 소성하고 약 1㎛정도로 분쇄하여 제조하는, 분자식이 Y2SiV2O10:Nd+3, Er+3인 비가시 발광물질과 그 제조방법이 제안되고 있으며, UV광 및 가시광을조사할 경우 적외선광을 발광케 하므로서, 위조방지 효과를 얻을 수 있게 하며, 은행권 등의 기계적 자동처리를 위한 기계인식기능을 부여할 수 있게 하고 천연색 복사기에 의한 복사를 방지할 수 있게 하는 효과를 지니는 것이다.In addition, according to the invisible light emitting material and the method of manufacturing the patent application No. 1996-045650 (Patent Application No. 1998-027003) disclosed and disclosed, the yttrium compound, silicon compound and vanadium ( Vanadium) oxide as a matrix, Nd 2 O 3 and Er 2 O 3 as an activator to the homogeneous mixing, it is calcined at 600-700 ℃ in an oxidizing atmosphere for 3-5 hours in a one-step reaction diameter The powder is pulverized to about 5-15 μm, the pulverized product is calcined at 1000-1200 ° C. for 3-5 hours in a two-step reaction, and then pulverized to a size of about 2-4 μm in diameter, and the two-step reactant is reacted in a three-step reaction. Is prepared by firing at 500-700 ° C. for 1-3 hours and pulverizing to about 1 μm. The invisible light emitting material having a molecular formula of Y 2 SiV 2 O 10 : Nd + 3 and Er + 3 and a method of manufacturing the same are proposed. In addition, when irradiated with UV light and visible light, it emits infrared light, thereby obtaining an anti-counterfeiting effect. It is possible to give the machine recognition function for the automatic mechanical processing of banknotes, etc., and to have the effect of preventing the copying by the color copier.
그러나, 이러한 방법들은 제조공정이 복잡하고 비용이 과다하게 소요되기 때문에 일반인이 사용하기 어렵다는 등의 문제가 있다.However, these methods have a problem such that it is difficult for the public to use because the manufacturing process is complicated and excessively expensive.
또한, 자기기록매체에 의한 경우, 그 자기기록매체의 자성이 소멸할 경우, 자칫 위조된 것으로 오해할 수 있으며, 위조판별 장치를 별도로 갖추어야 하기 때문에 일반인이 사용하기 어렵다는 등의 문제가 있다.In addition, in the case of the magnetic recording medium, when the magnetism of the magnetic recording medium disappears, it may be misunderstood as being forged, and there is a problem that it is difficult for the general public to use the counterfeit discrimination device separately.
따라서, 본 발명은 이러한 문제를 해결하기 위한 것으로, 지폐, 수표, 상품권 등의 유가증권과 보안문서 등의 위조방지, 보안, 인증을 위해 적용되기에 적합하고, 위조된 때에 쉽게 판별할 수 있는 무색의 비밀잉크 조성물 및 그 발색 조성물을 제공하는 데에 그 목적이 있다.Accordingly, the present invention is intended to solve such a problem, and is suitable for application for anti-counterfeiting, security, and authentication of securities such as banknotes, checks, gift certificates, and security documents, and colorless which can be easily distinguished when forged. It is an object to provide a secret ink composition and a color development composition thereof.
이러한 목적을 달성하기 위해 본 발명의 일실시예에 따른 비밀잉크 조성물은, EC(EC: 2-에톡시에탄올(2-ETHOXYETHANOL; 분자식: C4H10O2))에 MT(메칠알콜)를 40∼20% 혼합하여 A용액 1ℓ를 마련하고, 그 A용액에 푸에노르 후타랜 및 뿌지랄 수지 또는 CKR 수지를 10 ∼ 20g 및 130 ∼ 170g을 혼합시키며, 180-220℃로 가열한 OX(오리엔산: C17H23CO2H)을 15 내지 25cc 혼합하고 Si을 0.01 ∼ 0.001g 혼합하여 만들어지는 것을 특징으로 한다.Secret ink composition according to an embodiment of the present invention to achieve this object, EC (EC: 2- ethoxyethanol (2-ETHOXYETHANOL; Molecular Formula: C 4 H 10 O 2 )) MT (methyl alcohol) in the 40 to 20% of the solution was prepared to prepare 1 L of A solution, and 10 to 20 g and 130 to 170 g of Funor Futaran and Pujiral resin or CKR resin were mixed with the A solution, and heated to 180-220 ° C. Orenoic acid: 15 to 25 cc of C 17 H 23 CO 2 H) is mixed and 0.01 to 0.001 g of Si, characterized in that it is made by mixing.
또한, 본 발명은, 상기 비밀잉크로 인쇄한 때에 이를 발색시키기 위한 것으로, H2O 1000cc에 Ca(OH)2, KOH 등의 알카리 수용액으로서 PH 8.5 ∼ 10으로 하고, 20∼40%의 에틸알콜을 첨가한 것을 특징으로 하는 비밀잉크의 발색 조성물을 제공한다.In addition, the present invention is to develop a color when printed in the above secret ink, and to pH 8.5-10 as alkaline aqueous solution such as Ca (OH) 2 , KOH in H 2 O 1000cc, 20 to 40% ethyl alcohol It provides a coloring composition of the secret ink, characterized in that the addition.
이하, 본 발명의 바람직한 실시예를 통해 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to preferred embodiments of the present invention.
먼저, 본 발명은, 유성용액에 잘 용해되는 적정수지를 정량 배합함으로 이루어진 유성수지 용액, 즉 안료 등의 색소를 제외한 무색 유성 잉크의 원액을 작성한 후 상기 원액에 푸에노르 후타랜(C20H1404)을 정량 참가하여 이루어진 조성물(무색의 비밀잉크)을 인쇄 내지 프린트하기 위한 잉크로 사용한다.First, the present invention prepares a stock solution of a colorless oil ink excluding pigments such as pigments, that is, an oil-based resin solution made by quantitatively blending a suitable resin that is well dissolved in an oil-based solution, and then the puerto-futaran (C 20 H) 14 0 4 ) is used as an ink for printing or printing a composition (colorless secret ink) formed by quantitative participation.
이와 같은 무색 비밀잉크를 유색 즉, 적색으로 발색시키기 위해 그 무색 비밀잉크를 표기한 지면에 반응액으로서 알칼성 수용액(알콜 함유)으로 도포하면, 도포 즉시 유색인 적색으로 명확,선명하게 나타나게 되며, 또한, 장기간 소멸되지 않는다.When such a colorless secret ink is colored, that is, red, the colorless secret ink is applied to the surface marked with the colorless secret ink as an aqueous alkaline solution (containing alcohol), and immediately after application, the color appears clearly and vividly. It does not disappear for a long time.
상술한 본 발명의 비밀잉크의 성분은, 다양한 실시예에 따른 결과, 다음과 같다.The components of the secret ink of the present invention described above are as follows as a result of various embodiments.
① A용액 : EC에 MT를 40∼20% 함유한 것을 말하며, 다음 성분들은 이 A용액 1ℓ를 기준으로 하는 함량이다.① Solution A: 40 ~ 20% of MT is contained in EC. The following components are based on 1L of this solution.
② 후타랜 : 10 ∼ 20g② Futaran: 10-20g
③ 뿌지랄 수지 또는 CKR 수지 : 130 내지 170g(바람직한 것은, 150g)③ Pujiral resin or CKR resin: 130 to 170g (preferably 150g)
④ OX(오리엔산: C17H23CO2H을 180-220℃로 가열한 것): 15 내지 25cc(바람직한 것은 20cc)(4) OX (orientic acid: C 17 H 23 CO 2 H heated to 180-220 ° C.): 15 to 25 cc (preferably 20 cc)
⑤ Si: 0.01 ∼ 0.001g⑤ Si: 0.01 ~ 0.001g
③,④의 양은 약간 변할 수 있음The amount of ③, ④ may change slightly
위에서 EC는, 2-에톡시에탄올(2-ETHOXYETHANOL; 분자식: C4H10O2)이고, MT는 메칠알콜이며, OX는 오리엔산(C17H23CO2H)을 말하고, CKR 수지는 강남화성주식회사제의 Phenolite TD-773 즉, Mgo 반응성 Alkyl Phenol 수지를 말한다.In the above EC is 2-ethoxyethanol (2-ETHOXYETHANOL; molecular formula: C 4 H 10 O 2 ), MT is methyl alcohol, OX refers to orenoic acid (C 17 H 23 CO 2 H), CKR resin Phenolite TD-773 manufactured by Gangnam Hwasung Co., Ltd., namely Mgo-reactive Alkyl Phenol resin.
상기 OX는, 관용명/상품명으로 에탄올, 2-에톡시-(ETHANOL,2-ETHOXY-):셀로솔브(CELLOSOLVE); 도완올 EE(DOWANOL EE); 엑타솔브 EE(EKTASOLVE EE); 베타-에톡시에탄올(BETA-ETHOXYETHANOL); 2-에톡시에틸 알코올(2-ETHOXYETHYL ALCOHOL); 에틸 셀로솔브(ETHYL CELLOSOLVE); 에틸렌 글리콜 에틸 에테르(ETHYLENE GLYCOL ETHYL ETHER); 에틸렌 글리콜 모노에틸 에테르(ETHYLENE GLYCOL MONOETHYL ETHER); 글리콜 모노에틸 에테르(GLYCOL MONOETHYL ETHER); 폴리-솔브 EE(POLY-SOLV EE);The OX is a common name / brand name ethanol, 2-ethoxy- (ETHANOL, 2-ETHOXY-): cellosolve (CELLOSOLVE); Dowanol EE; Etasolve EE (EKTASOLVE EE); Beta-ethoxyethanol (BETA-ETHOXYETHANOL); 2-ethoxyethyl alcohol (2-ETHOXYETHYL ALCOHOL); Ethyl cellosolve (ETHYL CELLOSOLVE); Ethylene glycol ethyl ether (ETHYLENE GLYCOL ETHYL ETHER); Ethylene glycol monoethyl ether (ETHYLENE GLYCOL MONOETHYL ETHER); Glycol monoethyl ether (GLYCOL MONOETHYL ETHER); Poly-solve EE (POLY-SOLV EE);
이-180(E-180); 우레솔브 HG(디아나로이 주식회사)(URESOLVE HG(DYANALOY INC.)); KT1 2-EL(KT1 화학주식회사) (KT1 2-EL(KT1 CHEMICALS INC.)) 등을 포함한다.E-180 (E-180); Uresolve HG (DANAROY INC.) (URESOLVE HG (DYANALOY INC.)); KT1 2-EL (KT1 CHEMICALS INC.) And the like.
위의 CKR수지는 클로로프린 세멘트(Chloroprene Cement) 배합용으로서 특별히 개발된 Mgo 반응성 알킬 페놀(Alkyl Phenol) 수지로서 상술한 페놀라이트(Phenolite) TD-773의 성질은, 그 외관이 담황색 부명내지 반투명 괴상이며, 융점이 85 - 95이고, 점도(G#)가 F-K (60% Toluol)이며, 색상(G#)이 7max(60% Toluol)이고, MgO 흡수율이 5 - 7%이다. 그 CKR수지를 배합한 클로로프린계 접착제는 다음과같은 각종의 특징을 나타낸다.Above CKR resin is Mgo reactive alkyl phenol (Alkyl Phenol) resin specially developed for the mixing of Chloroprene Cement. Melting point is 85-95, viscosity (G # ) is FK (60% Toluol), color (G # ) is 7max (60% Toluol), MgO absorption is 5-7%. The chloroprene adhesive compounding the CKR resin exhibits various characteristics as follows.
1) 금속, 유희 등 비다공칠의 견고한 물질에 우수한 접착력을 나타낸다.1) It shows excellent adhesion to non-porous solid materials such as metal and play.
2) 조기접착력이 크고 건조가 빠르다.2) Early adhesion and fast drying.
3) 특히 내열성이 우수하다.3) Especially good heat resistance.
4) 내상분리성이 우수하다.4) Excellent phase separation resistance.
5) 점착보지시간은 비교적 짧다.5) The adhesion holding time is relatively short.
결정화속도가 느린 클로로프린을 병용하면 TD-773을 사용해도 점착보지시간을 어느 정도까지 연장하는 것이 가능합니다. 특히 강접착성이 필요한 경우는 SB-1001을 사용하면 됩니다. 상기 각 항목중 내열성과 상분리성과는 본래 양립이 어려운 것으로 되어 있으나, 페놀라이트 TD-773은 우수한 내열성을 나타내면서도 상분리가 어려우며 TD-773을 이용하는 것에 따라 한층 안정한 내열성 클로로프린계 접착제(Chloroprene Cement)를 제조하는 것이 가능하게 된다. 특히, 스프레이 세멘트(spray cement)를 제조할 때는 이 특징이 최대로 발휘된다.By using chloroprine with a slow crystallization rate, it is possible to extend the adhesion retention time to some extent using TD-773. In particular, if strong adhesion is required, use SB-1001. Although it is inherently difficult to be compatible with heat resistance and phase separation properties among the above items, phenolite TD-773 exhibits excellent heat resistance and is difficult to phase separate, and is more stable by using TD-773. It becomes possible to manufacture. In particular, this feature is maximized when producing spray cement.
본 발명의 비밀잉크의 구체적인 제조방법은, EC에 MT를 40∼20% 혼합하여 A용액 1ℓ를 마련하고, 그 A용액에 푸에노르 후타랜 및 뿌지랄 수지 또는 CKR 수지를 각각 10 ∼ 20g 및 130 ∼ 170g을 혼합시키며, 그 혼합액에 180-220℃로 가열한 OX를 15 내지 25cc 혼합하고 Si을 0.01 ∼ 0.001g 혼합하여 만들어진다.In the method for producing a secret ink according to the present invention, 40 to 20% of MT is mixed with EC to prepare 1 L of A solution, and 10 to 20 g of Fueno Futaran and fusiral resin or CKR resin, respectively, to the A solution. 130-170g are mixed, 15-25cc of OX heated at 180-220 degreeC is mixed with this liquid mixture, and 0.01-0.001g of Si are mixed.
이와 같이 하여 얻어진 비밀잉크는, 무색으로서 지폐, 수표, 상품권 등의 유가증권에 인쇄 내지 프린트하더라도 보이지 아니하여 복사 등의 수단으로 위조할 수 없게 된다. 또한, 유가증권, 보안문서 등에 본 발명의 비밀잉크로 인쇄함으로써 위조방지뿐만 아니라, 보안이 유지될 수 있게 된다.The secret ink thus obtained is colorless and invisible even if printed or printed on securities such as banknotes, checks, gift certificates, etc., and cannot be forged by means of copying or the like. In addition, by printing with the secret ink of the present invention, such as securities, security documents, security as well as forgery prevention can be maintained.
한편, 상술한 본 발명의 비밀잉크로 인쇄한 지면을 발색시키기 위한 발색조성물의 구성 및 제조방법은 다음과 같다.On the other hand, the configuration and manufacturing method of the color composition for coloring the surface printed with the secret ink of the present invention described above are as follows.
먼저, 물(H2O) 1000cc에 Ca(OH)2, KOH 등의 알칼리용액을 혼합하여 PH 8.5 ∼ 10의 알카리 수용액을 만든다. 그 뒤, 휘발성을 부여하기 위해 20∼40%의 에틸알콜을 첨가하여 혼합함으로써 본 발명의 비밀잉크의 발색 조성물이 얻어진다.First, alkaline solutions such as Ca (OH) 2 and KOH are mixed with 1000 cc of water (H 2 O) to form an alkaline aqueous solution having a pH of 8.5 to 10. Then, in order to impart volatility, 20-40% of ethyl alcohol is added and mixed to obtain a color ink composition of the secret ink of the present invention.
이와 같이 하여 얻어진 발색 조성물을 상술한 바와 같이 비밀잉크로 인쇄된 지면에 도포함으로써 즉시, 유색인 적색으로 선명하게 발색하게 된다. 이에 따라, 쉽게 위조여부를 판별할 수 있게 된다.The color development composition thus obtained is applied to the surface printed with the secret ink as described above, and immediately color is vividly colored red. Accordingly, it is possible to easily determine whether the forgery.
또한, 상술한 바와 같이 비밀잉크가 지면에서 발색된 후에는 그 기호, 문자, 도형 등을 표시한 비밀잉크가 소멸하지 아니하게 되어 영구적으로 보관할 수 있게 된다.In addition, as described above, after the secret ink is developed on the ground, the secret ink displaying the symbols, characters, figures, and the like does not disappear and can be stored permanently.
따라서, 위조방지, 인증, 보안 등이 필요한 경우, 본 발명의 비밀잉크가 사용될 수 있으며, 최종적으로 이를 확인하여 영구적으로 보관함으로써 증거력을 지니게 되어 유가증권이나 보안문서 등의 인증에 적용될 수 있게 된다.Therefore, when anti-counterfeiting, authentication, security, etc. is required, the secret ink of the present invention can be used, and finally, it is confirmed and permanently retained to have evidence to be applied to authentication of securities or security documents.
또한, 유가증권이나 보안문서 등에 비밀잉크로 인쇄하여 유통 내지는 전달한 후, 발색시킴으로써 그 유가증권이나 보안문서 등의 유효성을 상실시킬 수 있게 되고, 이에 따라 상품권 등의 유가증권을 거래한 후, 온 라인으로 그 상품권 등의 유가증권에 대해 현금화시킬 때, 최종 회수처에서 발색시켜 인증을 받고 온라인으로 현금화시킬 수 있게 되고, 그 뒤로는 발색된 것은 유효성이 상실된 것으로 표기하고 취급함으로써 상품권 등의 거래와 유통이 거래의 안전을 보장할 수 있게 되어 현실적으로 활발하게 거래 내지 유통될 수 있게 된다.In addition, after printing or distributing a secret ink to a security or security document and distributing or delivering it, it is possible to lose the validity of the security or security document by developing a color. Accordingly, after trading securities such as gift certificates, In the case of cashing securities such as gift certificates, they can be developed at the final collection point, certified, and cashed online. It is possible to ensure the safety of the transaction can be realistically actively traded or distributed.
이상에서 설명한 본 발명의 실시예에 따른 비밀잉크 조성물 및 그 발색 조성물의 구성과 작용에 의하면, 본 발명의 비밀잉크로 기호, 문자, 도형 등을 인쇄하거나, 프린트함으로써 빛에 의해 판별이 어려워 그 위조가 불가능하며, 또한, 위조여부를 판별하기 위해서는 본 발명의 발색 조성물을 도포함으로써 용이하고도 간단하게 기호, 문자, 도형 등을 확인할 수 있어 진위 판별이 매우 쉬울 뿐만 아니라, 유가증권과 보안문서 등의 보안, 인증 등의 효과가 있다.According to the constitution and operation of the secret ink composition and the coloring composition according to the embodiment of the present invention described above, it is difficult to distinguish by light by printing or printing symbols, characters, figures, etc. with the secret ink of the present invention. In addition, in order to determine whether the forgery by applying the color composition of the present invention can be easily and simply check the sign, characters, figures, etc. It is very easy to determine the authenticity, such as securities and security documents Security and authentication are effective.
Claims (2)
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| KR1020000062636A KR20020031874A (en) | 2000-10-24 | 2000-10-24 | secret ink composition and color former composition thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020065961A (en) * | 2001-02-08 | 2002-08-14 | 이철수 | counterfeit and forgery-proof security paper and its coloring apparatus |
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