Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
  • B41M5/286—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating using compounds undergoing unimolecular fragmentation to obtain colour shift, e.g. bleachable dyes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
  • Y10S430/165—Thermal imaging composition

Definitions

• thermographic copying wherein a copy of a differentially radiation-absorptive original is made on a heat-sensitive copy-sheet product held in'heat-conductive contact therewith by briefly exposing the original to intense infra-red radiation.
• the invention relates to novel heat-sensitive copy-sheet products.
• the invention relates to copy-sheet products useful in making negative color projection transparencies.
• the present invention employs a different class of color bodies and a different reaction system, and provides a heat-sensitive copy-sheet product which when locally heated, as in the thermographic copying process, is converted from a highly colored to a substantially colorless, and preferably a clear and transparent, form at the heated image areas without release of volatile decomposition products.
• the heat-sensitive copy-sheet products of the present invention contain p-quinoneimine color bodies which undergo decolorization when heated at thermographically induced temperatures in reactive association with a mild reducing agent.
• the color body is supplied in a matrix of film-forming binder as a coating on a paper, transparent film or other carrier or as a self-supporting film.
• the reducing agent may be incorporated in the same matrix, or in an adjacent stratum supported on the carrier or on a separate carrier.
• a particularly useful structure comprises a transparent flexible film carrier coated with a first stratum of p-quinoneimine color body in a transparent binder and overcoated with a mild reducing agent in a separate binder. Brief heating of the film product causes migration of at least one of the reactants and results in a decolorization of the color body at the heated area.
• Reducible p-quinoneimine color bodies which are useful in the preparation of heat-sensitive copy-sheets of the invention include those having thestructural formula.
• Ar is an aromatic radical and the R, R, R"
• R' substituent radicals may be hydrogen, halogen, alkyl, alkoxy or amido, or wherein substituent radicals on adjacent carbon atoms may complete a fused polycyclic or heterocyclic ring, all as exemplified by 2 2-chloro-2'-methyl-N,N-diethylindoaniline 2-chloro-N(p-diethylamino-2-methylphenyl)-pbenzoquinoneimine 2-acetamido-N,N,-diethylindoaniline 3-methoxy-2'-methyl-N,N-diethylindoaniline N-( l-naphthyl )-p-benzoquinoneimine N-(2-naphthyl)-p-benzoquinoneimine N-(p-acetylphenyl)-p-benzoquinoneimine 2,6-dichloroindophenol sodium salt 2,3',6-trichloroindophenol sodium salt 2,6
• quinolinoquinoneimine N-(2,4-diamino-5-methylphenyl)-pbenzoquinoneimine trihydrate indoferron N-(p-diethylamino-2-methylphenyl)-2-carboxylic-l 4-naphthoquinoneimine N-(p-dimethylaminophenyl l ,4-
• Binder systems may include such polymeric materials as polystyrene, styrene-acrylonitrile or sytrene-acrylate copolymers, styrene-butadiene-acrylonitrile terpolymers, polyvinylchloride, vinyl chloride-vinyl acetate copolymers, vinylidene chloride-acrylonitrile or vinylidene chloride-vinyl acetate copolymers, polyacrylates, polyvinyltoluene. These polymers are moistureresistant, being incapable of absorbing more than about one percent of water, and are preferred as contributing to the stability of the sheet materials during prolonged storage both before and after imaging.
• the concentration of color body in the color stratum must be sufficient to impart a distinctive color but excessive amounts require undesirably large quantities of reducing agent, or excessive heating, or may reduce the transparency of the stratum and accordingly are to be avoided.
• the amount of reducing agent available per unit area should be sufficient to react with all of the color body but need not be greatly in excess of that amount and, at least for single sheet projection transparencies, should be well within the range of full compatibility with the binder so that the stratum remains clear and non-light-diffusing.
• EXAMPLE 1 A carrier film of 2 mil (0.05 mm.) ethylene glycol terephthalate polyester film primed with a trace coating of terpolymer primer is supplied with first and second reactant strata, with intermediate and final drying, as follows:
• EXAMPLE 2 A solution containing 2-chloro-2'-mcthyl-N,N-dimethylindoaniline 0.6 polyvinyl chloride-acetate (VYNS" resin) l2.() methylethyl ketone 96 toluene 12 is applied to thin polyester film and dried in an oven at F. The dried coating is a deep blue in color and weighs 4.7 g./sq. m.
• a solution containing tertiary butyl hydroquinone l h sec. nitrocellulose l polyamidc (Elvamidc 8061" resin) l methanol 97 is applied over the first coating at approximately the same wet coating thickness and is promptly dried in the 150F. oven.
• the resulting film is imaged in a thermographic copying machine to provide a negative color projection transparency as in Example 1.
• EXAMPLE 10 EXAMPLE 7 Coated over first coat at 2 mils (0.05 mm.) and dried.
• the initial magenta color gradually fading during stor- The solutions are coated on separate sheets of thin age. Some improvement in performance may be polyester film, and the two sheets are combined and achieved by increasing the proportion of binder but processed, as in Example 6, with similar results. these sheets are generally less permanent and hence As an alternate structure a second sheet is prepared less desirable than those in which the 'tWO reactants are from a solution of ten parts of t-butyl hydroquinone in separate strata.
• Second coat stannous chloride 1 vinyl acrylate latex (Ucar 360) (55% NVM) O Simple contact heating with heated type or stylus is also effective and permits more accurate determination of temperature if desired for comparison or test purposes.
• Colored sheet material capable of undergoing localized loss of color when thermographically heated in presence of a reducing agent and containing a pquinoneimine color body in a film-forming binder, wherein said color body has the structure wherein Ar is an aromatic radical and the R, R, R and R' substituent radicals may be hydrogen, halogen, alkyl, alkoxy or amido, or wherein adjacent substituent radicals may constitute a fused polycyclic or heterocyclic ring.
• Sheet material of claim 1 disposed in face-to-face relationship with a second sheet containing said reducing agent.
• Sheet material of claim 3 wherein said reducing agent is a hydroquinone, catechol, resorcinol or trihydroxy-aromatic mild reducing agent.
• Sheet material of claim 6 wherein said strata are supported on a thin flexible transparent film carrier.

Landscapes

• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Heat Sensitive Colour Forming Recording (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Priority Applications (7)

Applications Claiming Priority (1)

Publications (1)

Family

ID=23221008

Family Applications (1)

Country Status (7)

Cited By (13)

Families Citing this family (2)

Citations (7)

• 1972
  • 1972-12-13 US US00314687A patent/US3852093A/en not_active Expired - Lifetime
• 1973
  • 1973-11-14 CA CA185,752A patent/CA981453A/en not_active Expired
  • 1973-12-12 GB GB5759873A patent/GB1399958A/en not_active Expired
  • 1973-12-12 DE DE2362377A patent/DE2362377B2/de active Granted
  • 1973-12-12 JP JP48139269A patent/JPS4991239A/ja active Pending
  • 1973-12-12 FR FR7344295A patent/FR2330260A5/fr not_active Expired
  • 1973-12-12 IT IT7354272A patent/IT1000446B/it active

Patent Citations (7)

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