Method of imaging and developing negative-working elements

An imaging and component technology, used in photography, printing technology, photosensitive material processing, etc.

Inactive Publication Date: 2010-01-20
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Or develop UV-imaged negative working elements with organic solvent-based developers tha...

Method used

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  • Method of imaging and developing negative-working elements
  • Method of imaging and developing negative-working elements
  • Method of imaging and developing negative-working elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0182] By adding polymer A (1.2g), oligomer A (0.83g), IR dye (0.094g), 1035 (0.50g, 5% concentration in MEK), SR-399 (1.28g), Pigment 951 (0.34g), PEGDA (0.28g), Phosmer PE (0.038g), 307 (0.32 g), and Initiator A (0.22 g) were dissolved in PGME (29.9 g) and MEK (15.0 g) to make an imageable layer formulation. Electrochemically grained and sulfuric acid anodized aluminum substrates post-treated with polyvinylphosphoric acid were coated with this formulation at a dry coating weight of approximately 1.3 g / m 2 .

[0183] Place the resulting imageable element in A Trendsetter 3244x imagesetter (Creo, Burnaby, British Columbia, Canada, a subsidiary of Eastman Kodak Company) was used and exposed with an 830 nm IR laser at 4.5 W power and varying drum speed (250-60 RPM). The imaged elements were then developed in a pan at 25°C with a 955 Developer. The minimum energy to obtain a stable solid density image and a clear background is about 120mJ / cm 2. After the resulting print...

Embodiment 2

[0185] By adding polymer B (1.2g), oligomer A (0.83g), IR dye (0.094g), 1035 (0.50g, 5% concentration in MEK), SR-399 (1.28g), Pigment 951 (0.34g), PEGDA (0.28g), Phosmer PE (0.038g), 307 (0.32 g), and Initiator A (0.22 g) were dissolved in PGME (29.9 g) and MEK (15.0 g) to make an imageable layer formulation. Electrochemically grained and sulfuric acid anodized aluminum substrates post-treated with polyvinylphosphoric acid were coated with this formulation and had a dry coating weight of approximately 1.3 g when properly dried on a rotating drum at 77°C for approximately 2 minutes / m 2

[0186] The resulting imageable elements were then imaged and processed as described in Example 1. The minimum ability to obtain a stable solid density image and a clear background is about 130mJ / cm 2 . After the resulting printing plate was kept at a constant temperature of 48°C or 38°C / 80% humidity for 5 days, it showed similar digit speed and clear background.

Embodiment 3

[0188] An imageable layer formulation was prepared as described in Example 1 and coated onto an electrochemically grained and sulfuric acid anodized aluminum substrate post-treated with polyvinylphosphoric acid, when suitably placed on a rotating drum at 77°C. After drying for about 2 minutes, the dry coating weight is about 1.3g / m 2 .

[0189] A topcoat formulation containing Airvol 203 polyvinyl alcohol (67.9 g of a 9.7% aqueous solution), polyvinylimidazole (5.8 g of a 20% aqueous solution), 2-propanol (20.7 g) and Water (405.6g). After coating the topcoat formulation in a similar manner to the imageable layer formulation, the imageable element was dried on a rotating drum at 77°C for about 2 minutes to provide about 0.35 g / m 2 dry top coat.

[0190] The resulting imageable elements were imaged and processed as described in Example 1 (except that the imaging power was 2.5W). The minimum energy required to obtain a stable solid density image and a clear background is app...

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Abstract

Negative-working imageable elements can be imaged and then developed using a lower pH organic-based single-phase developer that is less toxic and corrosive and that can be more readily disposed of after use. This developer has a pH less than 12 and comprises a) an amphoteric surfactant comprising a nitrogen-containing heterocycle, b) an amphoteric surfactant having two or more nitrogen atoms, or c) an amphoteric surfactant of a) and an amphoteric surfactant of b).

Description

technical field [0001] The present invention relates to a method for imaging and developing negative-working elements using an environmentally friendly developer. Background technique [0002] Radiation sensitive compositions are commonly used in the preparation of imageable materials including lithographic printing plate precursors. Such compositions typically include a radiation-sensitive component, a radiation-polymerizable component, an initiator system, and a binder. Each of these ingredients has been the focus of research to provide various improvements in physical properties, imaging performance and image characteristics. [0003] Recent developments in the field of printing plate precursors have focused on the use of radiation-sensitive compositions imageable by lasers or laser diodes, more particularly radiation-sensitive compositions imageable and / or developed on-press. Since the laser can be directly controlled by a computer, laser exposure does not require trad...

Claims

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Application Information

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IPC IPC(8): G03F7/32B41C1/10
CPCB41N3/06B41C1/1008G03F7/322B41C2210/04B41C2210/06B41C2210/10B41C2210/22B41C2210/24
Inventor T·陶K·B·雷S·A·贝克利P·R·韦斯特
Owner EASTMAN KODAK CO
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