WO2002066261A1 - Procede d'impression a l'aide d'un colorant - Google Patents

Procede d'impression a l'aide d'un colorant Download PDF

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Publication number
WO2002066261A1
WO2002066261A1 PCT/JP2002/001401 JP0201401W WO02066261A1 WO 2002066261 A1 WO2002066261 A1 WO 2002066261A1 JP 0201401 W JP0201401 W JP 0201401W WO 02066261 A1 WO02066261 A1 WO 02066261A1
Authority
WO
WIPO (PCT)
Prior art keywords
dye
aggregate
size
crystal
crystals
Prior art date
Application number
PCT/JP2002/001401
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Saijo
Original Assignee
Kansai Technology Licensing Organization Co., Ltd
General Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kansai Technology Licensing Organization Co., Ltd, General Co., Ltd. filed Critical Kansai Technology Licensing Organization Co., Ltd
Publication of WO2002066261A1 publication Critical patent/WO2002066261A1/fr

Links

Classifications

    • 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
    • B41M3/142—Security printing using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes

Definitions

  • the present invention belongs to a recording method using a dye, and can be suitably used for preventing forgery of securities and the like.
  • Certain dyes such as cyanine dyes, aggregate dozens to hundreds of monomer dye molecules and arrange them in a head-10-1a ⁇ structure, which behaves optically as if they were a single molecule. Form an aggregate. When a J-aggregate is formed, it exhibits an extremely steep light absorption peak and exhibits an excellent effect as an optical recording material, so that it is widely used in optical fields such as photo-sensitive materials.
  • the light absorption peak of the J-aggregate is remarkably sharper than that of the monomer, it is not a single wavelength but has a broader tail with a width of several tens nm. Traditionally, this broadening of the tail was considered to be the scattering of light by several nanometers of ultrafine crystals.
  • the inventor of the present invention has found, in the process of observing the J-aggregate with an electron microscope, that the above-mentioned spread of the tail does not depend on light scattering but shows a distribution of J-aggregate microcrystals for each size. In other words, even J-aggregates made of the same chemical species have different spectral colors due to the difference in size.
  • an object of the present invention is to provide a forgery or forgery based on the above-mentioned finding that the broadening of the light absorption peak of the J-aggregate shows a distribution for each crystal size. To provide a difficult and difficult information recording method. Disclosure of the invention
  • a first information recording method of the present invention is:
  • the dye is characterized in that the peak wavelength and half width of the light absorption spectrum are controlled based on the size of the J-aggregate crystals.
  • a dye obtained by selectively collecting only J-aggregate crystals of a predetermined size by, for example, electrophoresis, ultracentrifugation, or molecular sieve is used.
  • the dye is characterized by being composed of a single chemical species and having a plurality of peak wavelengths that can be distinguished from each other in a light absorption spectrum.
  • the first information recording method even if the peak wavelength is shifted based on the crystal size and the recording is performed with a dye having a reduced half-width, for example, the dye having the same peak wavelength and half-value width happens irrespective of the crystal size. Recorded in Indistinguishable from information.
  • the dye is composed of a single chemical species
  • the dye is composed of a plurality of crystal groups each having a peak wavelength that can be distinguished from each other. It cannot be obtained unless the peak wavelength and half width are controlled, and there is no chance of coincidence. Also, as the number of crystal groups that can be combined increases, the combination of peak wavelengths increases exponentially and becomes enormous, so that imitation and duplication become increasingly impossible.
  • FIG. 1 is a graph showing the size distribution of J-aggregate crystal particles for each emission color.
  • FIG. 2 shows the spectral waveform of a certain dye obtained by a known method in the upper part, and the spectral waveform of the dye whose wavelength is controlled based on the size of the J-aggregate crystal particles in the lower part.
  • FIG. 3 is a plan view showing a bill on which information is recorded by the recording method of the embodiment.
  • FIG. 4 is a plan view showing an ID card on which information is recorded by the recording method of the embodiment.
  • Any applicable dye may be used as long as it can form a J-aggregate. Can be
  • the crystal size distribution of the J-aggregate can be determined, for example, as follows. First, J-aggregate crystals produced according to the usual method are observed with a force source luminescence (hereinafter, “CL”) electron microscope. Reproduce. And Then, the colors of the J-aggregates are classified into, for example, green, light green, and yellow-green, and the crystal size of the J-aggregates is calculated for each classification from the number of pixels on the reproduced image and the magnification. The number of each size is determined by counting on the photograph. From this result, the relationship between the emission color and the size of the J-aggregate can be determined.
  • CL force source luminescence
  • Fig. 1 shows the size distribution of the oxacarposocyanin J aggregate for each emission color.
  • a certain J-aggregate obtained by a known production method has the spectrum waveform in the upper part of FIG.
  • the horizontal axis is the wavelength and corresponds to the crystal size of the J-aggregate
  • the vertical axis is the light absorption and the J-aggregate crystal particles of a specific size.
  • J-aggregate crystals having the size indicated by arrow A are selected by a molecular sieve.
  • the sorted group of J-aggregate crystals had an extremely narrow peak wavelength and shifted spectrum waveform. Is a specialized pigment.
  • this characteristic dye is printed in a dot shape as a code (2) of a banknote (1) as shown in FIG. 3, for example.
  • FIG. 4 is a plan view showing an embodiment in which the information recording method of the present invention is applied to an ID card.
  • the code is printed below the ID number with a dye consisting of J-aggregate crystals of a specific size.
  • a certain J-aggregate obtained by a known production method has the spectrum waveform in the upper part of FIG.
  • a J-aggregate crystal having a size indicated by an arrow B and a J-aggregate crystal having a size indicated by an arrow C are respectively selected by electrophoresis, ultracentrifugation, molecular sieve, or the like.
  • the spectral waveform of the specialized dye obtained by mixing these two types of J-aggregate crystals was obtained by combining the two spectra as shown in the lower part of Fig. 5. Things.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)

Abstract

L'invention se rapporte à un procédé permettant d'imprimer des informations sur un support d'impression tel que du papier destiné à un billet ou une carte, et ce au moyen d'un colorant capable de former un agrégat-J, ce qui permet d'empêcher la fabrication de faux et les contrefaçons. Ledit procédé se caractérise en ce que la demi-longueur d'onde et longueur d'onde de crête d'un spectre d'absorption de la lumière du colorant sont régulées en fonction de la taille du cristal de l'agrégat-J.
PCT/JP2002/001401 2001-02-20 2002-02-19 Procede d'impression a l'aide d'un colorant WO2002066261A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001044080A JP2004338091A (ja) 2001-02-20 2001-02-20 色素による記録方法
JP2001-44080 2001-02-20

Publications (1)

Publication Number Publication Date
WO2002066261A1 true WO2002066261A1 (fr) 2002-08-29

Family

ID=18906133

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/001401 WO2002066261A1 (fr) 2001-02-20 2002-02-19 Procede d'impression a l'aide d'un colorant

Country Status (2)

Country Link
JP (1) JP2004338091A (fr)
WO (1) WO2002066261A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8330122B2 (en) 2007-11-30 2012-12-11 Honeywell International Inc Authenticatable mark, systems for preparing and authenticating the mark

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737427A (en) * 1985-03-06 1988-04-12 Matsushita Electric Industrial Co., Ltd. Optical high density recording mediums, method for making same and method for recording optical information in the medium
JP2000119575A (ja) * 1998-10-20 2000-04-25 Mitsubishi Chemicals Corp インクジェット用インク

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737427A (en) * 1985-03-06 1988-04-12 Matsushita Electric Industrial Co., Ltd. Optical high density recording mediums, method for making same and method for recording optical information in the medium
JP2000119575A (ja) * 1998-10-20 2000-04-25 Mitsubishi Chemicals Corp インクジェット用インク

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8330122B2 (en) 2007-11-30 2012-12-11 Honeywell International Inc Authenticatable mark, systems for preparing and authenticating the mark

Also Published As

Publication number Publication date
JP2004338091A (ja) 2004-12-02

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