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Method of imaging and developing positive-working imageable elements

An imaging element and imaging technology, used in photography, nuclear engineering, printing technology and other directions, can solve the problems of undesired reaction of toxic waste liquid, etc., and achieve the effect of mild development conditions and simplified processing

Inactive Publication Date: 2011-04-27
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While such developers are effective at removing imaged portions of the imageable layer, they can undesirably react with the aluminum substrate and generate toxic waste, creating discharge issues
In addition, silicates may accumulate in piping and other parts of processing plants

Method used

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  • Method of imaging and developing positive-working imageable elements
  • Method of imaging and developing positive-working imageable elements
  • Method of imaging and developing positive-working imageable elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0196] Imageable elements of the present invention were prepared using the following positive working infrared radiation sensitive composition formulations in the following manner:

[0197] Polymer A 0.9020g

[0198] LB 9900 (49% in PM) 0.1220g

[0199] S 0094IR dye 0.0300g

[0200] Crystal Violet 0.0240g

[0201] Sudan Black B 0.0240g

[0202] DMABA0.1560g

[0203] Polyfox PF 652 (10% in PM) 0.0360g

[0204] MEK 4.83g

[0205] PM 8.88g

[0206] The formulations were filtered, applied by the usual method on electrochemically roughened and anodized aluminum substrates which had been treated with an aqueous sodium phosphate / sodium fluoride solution, and dried in a Glunz & Jensen "Unigraph Quartz" oven at 100°C. The imaging layer was coated for 30 seconds. The dry coverage of the imageable layer is about 1.5 g / m 2 . The single imageable layer is the outermost layer of the imageable element. The imageable elements were conditioned with paper inserts for two days at 60...

Embodiment 2

[0209] The imageable elements were prepared, imaged and processed using the same general method as described above for Inventive Example 1, this time the imaged elements were processed for 60 seconds, and the following infrared radiation sensitive composition formulation was used:

[0210] Polymer A 0.7460g

[0211] LB 9900 (49% in PM) 0.0490g

[0212] S0094 IR dye 0.0240g

[0213] Crystal Violet 0.0190g

[0214] Sudan Black B 0.0190g

[0215] DMABA0.1250g

[0216] Polyfox PF 652 (10% in PM) 0.0290g

[0217] MEK 3.86g

[0218] PM 7.13g

[0219] The results obtained for Inventive Example 2 are shown in Table I below.

Embodiment 3

[0221] The imageable elements were prepared, imaged and processed using the same general method as Inventive Example 1 above, but this time the imaged and processed elements were dried at 60°C for 1 minute. Twenty hours later, the lithographic printing plates were assembled on a Heidelberg GTO-52 press, washed with water, and used for 150,000 high quality impressions (200 lpi).

[0222] Table I

[0223]

[0224] The results in Table I demonstrate that positive-working infrared radiation-sensitive imageable elements prepared using formulations containing Polymer A can be processed (developed) using the carbonate-containing M-1 single processing solution of the present invention to reveal a latent image. The results of Inventive Example 3 demonstrate that the printed side of the imaged and treated element (lithographic printing plate) was protected by a single treatment solution and was successfully used to print multiple high quality impressions.

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Abstract

A method of making imaged elements such as lithographic printing plates is achieved by imagewise exposing an infrared radiation-sensitive positive-working imageable element to provide exposed and non-exposed regions. The imaged element is developed using a single processing solution having a pH of from 9 to 11.5 and containing carbonate ion and at least 1 weight % of one or more anionic surfactants, to remove predominantly only the exposed regions to provide an image and to provide a protective coating on the imaged surface. The imageable element comprises a substrate and a radiation absorbing compound, and has an imageable layer on the substrate that comprises a developability-enhancing compound and a poly(vinyl acetal) in which at least 25 mol % of its recurring units comprise pendant nitro-substituted phenolic groups.

Description

technical field [0001] The present invention relates to a method of preparing imaged elements, such as lithographic printing plates, from positive-working imageable elements containing a unique poly(vinyl acetal) binder using a single carbonate treatment solution containing an anionic surfactant. Background technique [0002] In lithography, ink-receptive areas called image areas are created on a hydrophilic surface. When the surface is wetted with water and ink is applied, the hydrophilic areas retain the water and repel the ink, and the ink receptive areas accept the ink and repel the water. The ink is then transferred to a suitable material surface on which the image will be reproduced. In some cases, the ink may be first transferred to an intermediate backing layer, which in turn is used to transfer the ink to the surface of the material on which the image will be reproduced. [0003] Imageable elements useful in preparing lithographic (or flexographic) printing plates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/10B41M5/36G03F7/039G03F7/32
CPCG03F7/322B41C1/1008B41C2210/02B41C2210/06B41C2210/20B41C2210/22B41C2210/24B41C2210/262Y10S430/145
Inventor M·勒瓦农M·纳卡什
Owner EASTMAN KODAK CO