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Lithographic developer composition and method of use

a developer composition and composition technology, applied in the field of unique silicate-free developer compositions, can solve the problem of reducing the effectiveness of the actual protecting agent in the developer composition

Active Publication Date: 2017-03-09
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution ensures consistent and efficient removal of ink receptive layers in exposed regions while protecting non-exposed regions, maintaining development speed and stability over time, and maintaining the clarity and effectiveness of the developer composition.

Problems solved by technology

This upward shift will reduce the effectiveness of the actual protecting agent in the developer composition (thus, it drops below the optimal level) and the developer composition becomes more aggressive in removing the imageable layer coating in the non-exposed regions.

Method used

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  • Lithographic developer composition and method of use
  • Lithographic developer composition and method of use
  • Lithographic developer composition and method of use

Examples

Experimental program
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Effect test

invention example 1

[0195]Lithographic Printing Plate Precursor A was imagewise exposed using a Trendsetter Quantum 800 Plate setter (available from Eastman Kodak Company) and processed with the silicate-free developer composition (Developer 1) according to the present invention and having the formulation shown in the following TABLE I.

TABLE IComponentAmount (g)Deionized water89.26Calcium chloride 2x H2O0.03Bayhibit ® AM0.38Citric acid•H2O1.07Potassium hydroxide (45%8.01solution)PC1742 moderator for the1.20coating protecting agentCyphos ® IL 253 coating0.05protecting agent

[0196]The performance of the combination of Lithographic Printing Plate Precursor A and Developer 1 were evaluated using a number of tests, as described below and the results are shown below in TABLE II. For Invention Example 1, the good results were retained when the amount of PC1742 moderator for the coating protecting agent was reduced to 1.0, 0.8, and 0.6 weight % from 1.2 weight %.

invention example 2

[0197]Invention Example 1 was repeated except that PC1742 moderator for the coating protection agent in Developer 1 was replaced with 1 weight % Tamol® NH4501 moderator to form Developer 2. The test results for Invention Example 2 are shown below in TABLE II. The turbidity test was also carried out after Developer 2 had been stored at 60° C. and 40° C. for 24 hours. Some turbidity was observed after storage at such higher temperatures but not after storage at ambient temperature of about 25° C.

invention example 3

[0198]Invention Example 1 was repeated except that PC1742 moderator for the coating protection agent in Developer 1 was replaced with 1 weight % Tamol® NH7519 moderator and the amount of the coating protection agent Cyphos® IL253 was increased from 0.05 weight % to 0.1 weight % to form Developer 3 (the was balanced by adjusting the amount of water). The test results for Invention Example 3 are shown below in TABLE II. Developer 3 remained clear after storage at 60° C. for 24 hours.

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Abstract

Lithographic printing plates are formed by imagewise exposing a single-layer or dual-layer positive-working lithographic printing plate precursor. The precursor has an outermost ink receptive layer containing a phenolic resin. The exposed precursor can be processed using a silicate-free developer composition having a pH of at least 12.5. This composition also includes an alkali metal hydroxide; a coating protecting agent that is a quaternary ammonium salt or phosphonium salt, or a mixture thereof, and a moderator for the coating protecting agent that is represented by the following general formula (I):wherein m is at an integer of at least 1 and up to and including 10 and M represents one or more counterions sufficient to balance the negatively-charged sulfonate groups.

Description

FIELD OF THE INVENTION[0001]This invention relates to a unique silicate-free developer compositions that have relatively high pH that can be used in a method for providing lithographic printing plates from corresponding infrared radiation sensitive-exposed single-layer or dual-layer positive-working lithographic printing plate precursors.BACKGROUND OF THE INVENTION[0002]In conventional or “wet” lithographic printing, ink receptive regions, known as image areas, are generated on a hydrophilic surface. When the surface is moistened with water and ink is applied, the hydrophilic surface not covered by the image areas (known as hydrophilic regions or non-image areas) retain the water and repel the ink, and the ink receptive regions accept the ink and repel the water. The ink can be directly transferred to the surface of a material upon which the image is to be reproduced. Alternatively, the ink can be first transferred to an intermediate blanket that in turn is used to transfer the ink ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03F7/32G03F7/40B41C1/10G03F7/20
CPCG03F7/327B41C1/1041G03F7/40G03F7/20G03F7/322
Inventor HUANG, JIANBINGHAUCK, GERHARDSAVARIAR-HAUCK, CELINPAULS, ANDREAFRANK, DIETMARPIESTERT, OLIVER
Owner EASTMAN KODAK CO