Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C1/00—Forme preparation
  • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
  • B41C1/1091—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by physical transfer from a donor sheet having an uniform coating of lithographic material using thermal means as provided by a thermal head or a laser; by mechanical pressure, e.g. from a typewriter by electrical recording ribbon therefor

Definitions

• information is transferred to an offset printing plate, for example by means of photofrthographic methods.
• a suitable mask must be created from the previous day, e.g. by photographic means.
• a light-sensitive coated printing plate can be imagewise differentiated into hydrophobic and hydrophilic areas by exposure through this mask.
• Another possibility of transferring information to a printing plate suitable for offset printing is the electrophotographic method.
• the invention was based on the object of providing a method for producing offset printing plates in which electrically stored information, such as texts or images, is direct, i.e. without an intermediate optical image, such as e.g. in the photographic mode of operation is necessary, can be transferred to a printing plate suitable for offset printing.
• the previously hydrophilic plate surface is made hydrophobic by (I) at the transfer sites
• the evaporable and / or meltable substances of the formula (I) applied to the support adhere very well to the aluminum surface of the offset plate and make the surface hydrophobic at the coated areas.
• the adhesiveness of the transferred substances can optionally be further improved by heat treatment of the coated plate.
• An offset printing plate produced in this way can be used directly for printing.
• SH, -NH 2 , -NHAlkyi, -NHOH, C NOH, pyridinyl, quinolinyl, pyrimidinyl, pyrazinyl, imidazolyl and imidazolinyl may be mentioned, it being possible for the heterocyclic systems to be further substituted.
• radicals X can be the same or different.
• Suitable hydrophobic radicals, on which the substituents X are, are those which are derived from aromatic, from heteroaromatic, from partially saturated or fully saturated heterocyclic or cycloaliphatic ring systems.
• the hydrophobic residue A derives e.g. B. from benzene, naphthalene, anthracene, naphthoquinone, anthraquinone, benzophenone, indane, azastilbene or azo compounds based on benzene, naphthalene, pyridine, quinoline and / or thiophene.
• (I) has 1 to 6, preferably 2 to 5, in particular 2, 3 or 4, hydrophilic substituents X.
• a thin heat-resistant carrier for use in accordance with the method of the invention (I) is applied to a thin heat-resistant carrier, optionally together with a binder.
• Thin heat-resistant films made of polyester, polycarbonate with layer thicknesses between 1 and 20, preferably between 2 and 10 ⁇ m are preferably considered as supports.
• the back of the supports can be coated, eg. B. with aluminum or tin or with other temperature-resistant substances such as SiO 2 , Al 2 O 3 or Zn0 to prevent sticking to the thermal head.
• the coating of the film with the vaporizable substance (I) can, for. B. by spinning, knife coating, spin coating or vapor deposition.
• the layer thickness is generally 0.05 ⁇ m to 10 ⁇ m, preferably 0.1 ⁇ m to 5 ⁇ m.
• a 4 .mu.m thick PES film is vapor-coated on the back with tin (layer thickness: 200 nm) in a vacuum apparatus.
• the plate is annealed at 80 ° C (duration: 10 min). The plate is then ready for printing.
• Example 1a A PES film (5 .mu.m) vapor-coated on the back with a temperature-resistant substance was vaporized as in Example 1a) with the compounds indicated in the table.
• the vapor-deposited temperature-resistant substance and its layer thickness are given in columns 2 and 3 of the table.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Optics & Photonics (AREA)
• Manufacturing & Machinery (AREA)
• Printing Plates And Materials Therefor (AREA)
• Photosensitive Polymer And Photoresist Processing (AREA)
• Manufacture Or Reproduction Of Printing Formes (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)
• Printing Methods (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6264016

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (3)

Family Cites Families (2)

• 1985
  • 1985-03-02 DE DE19853507418 patent/DE3507418A1/de not_active Withdrawn
• 1986
  • 1986-02-28 AT AT86102624T patent/ATE52216T1/de not_active IP Right Cessation
  • 1986-02-28 DE DE8686102624T patent/DE3670595D1/de not_active Expired - Lifetime
  • 1986-02-28 EP EP86102624A patent/EP0194526B1/fr not_active Expired - Lifetime

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