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
  • B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
• • 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
  • B41M5/36—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties
  • B41M5/368—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties involving the creation of a soluble/insoluble or hydrophilic/hydrophobic permeability pattern; Peel development
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
  • B41C2210/02—Positive working, i.e. the exposed (imaged) areas are removed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
  • B41C2210/06—Developable by an alkaline solution
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
  • B41C2210/22—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by organic non-macromolecular additives, e.g. dyes, UV-absorbers, plasticisers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
  • B41C2210/24—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions involving carbon-to-carbon unsaturated bonds, e.g. acrylics, vinyl polymers

Definitions

• cyclic compound examples include benzotriazoles, 5-phenyl-1 H-tetrazole and
• a radiation-to-heat converting compound(C) capable of absorbing incident radiation, preferably infrared radiation, and converting it to heat, is preferably incorporated in the coating composition.
• the radiation-to-heat converting compounds suitable for the invented heat-sensitive compositions may be chosen from a wide range of organic and inorganic pigments such as carbon blacks, phthalocyanines or metal oxides.
• Acetalization of the polyvinyl alcohols takes place according to known standard methods as described, for example, in U.S. Pat. No. 4,665,124; U.S. 4,940,646; U.S. 5,169,898; U.S. 5,700,619; U.S. 5,792,823; JP 09,328,519 etc.
• Levanon et al. provide detailed synthesis examples for the acetal polymers used in the present invention.
• a coating was made with the composition:
• Two plates were cast manually, one with the above solution containing Zelec 8172 as a development-enhancer and one with the reference solution in Example 28 without development-enhancer.
• the plates had a coating weight of 1.7-1.8 g/m 2 .
• the plates were dried at 125°C, 2min and imaged with 12 W an energy series between 80- 300mJ/cm 2 .
• the plates were developed in 60% Goldstar at 23°C, 30 s.
• the clearing point and % weight loss in developer were 140 mJ/cm 2 and ⁇ 50, respectively for the plate containing Zelec 8172 while the reference plate without developability-enhancing compound did not clear up to 300 mJ/cm 2 .
• the coating solution in this example and the reference coating (as in Example 28) were made in acetone: Dowanol PM, 75:25 at 10% solids.
• the solutions were cast with a rod on anodized aluminum substrate.
• the resulting plates were baked at 130°C for 3 min.
• the coating weight was 1.7 g/m 2 .
• the plates were exposed to a 830 nm IR laser radiation at a power of 8W and an energy density series of 90-400 mJ/cm 2 .
• the plates were developed in a DuPont-Howson processor in a developer containing 7% sodium metasilicate of conductivity 71 mS/cm in the following conditions: 23°C and 30 s residence time.
• the plate with resorcinol developability-enhancing compound had a clearing point of 15QmJ/em 2 and a non-irradiated % coating weight loss of ⁇ 50 as compared to 350 rnJ/cm 2 and a non-irradiated % coating weight loss of ⁇ 50 for the reference plate.

Landscapes

• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Thermal Sciences (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Materials For Photolithography (AREA)
• Photosensitive Polymer And Photoresist Processing (AREA)
• Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)

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• 2004
  • 2004-03-12 EP EP04719888A patent/EP1603749A2/de not_active Withdrawn
  • 2004-03-12 JP JP2006504077A patent/JP4473262B2/ja not_active Expired - Fee Related
  • 2004-03-12 WO PCT/CA2004/000381 patent/WO2004081662A2/en active Application Filing
• 2010
  • 2010-01-06 JP JP2010000879A patent/JP2010146013A/ja active Pending

Patent Citations (4)

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