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Sensitizer/initiator combination for negative-working thermal-sensitive compositions usable for lithographic plates

A technology of composition and sensitizer, applied in lithographic printing equipment, printing process, printing, etc.

Inactive Publication Date: 2011-01-26
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, it is desirable to further increase the digital imaging rate of printing plates and extend the printing cycle without any reduction in shelf life

Method used

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  • Sensitizer/initiator combination for negative-working thermal-sensitive compositions usable for lithographic plates
  • Sensitizer/initiator combination for negative-working thermal-sensitive compositions usable for lithographic plates
  • Sensitizer/initiator combination for negative-working thermal-sensitive compositions usable for lithographic plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 7 and comparative example 1 to 8

[0278] Use polyvinyl phosphoric acid aqueous solution to have 3g / m 2 Electrochemical surface graining of oxide weight and post-treatment of anodized aluminum foil. The average roughness of the surface was 0.55 μm. After filtration, the coating compositions corresponding to Table 1 were applied to the substrates with a wire-wound bar applicator. The coating was dried at 90°C for 4 minutes. Coating weight is 1.4g / m 2 .

[0279] Table 1 Radiation Sensitive Compositions

[0280]

[0281] The obtained sample was overcoated with an aqueous solution of poly(vinyl alcohol) (Celvol 203, purchased from Air Products, having a degree of hydrolysis of 88%) with a wire-wound bar coater, and dried at 90° C. for 4 minutes to obtain a printing plate precursor. The coat weight of the polyvinyl alcohol top coat is 1g / m 2 .

[0282] The plates of the Examples and Comparative Examples were imaged using a Trendsetter 3244 (830 nm) from Kodak using UGRA / FOGRA Appendix Article Version 2.0 ...

Embodiment 7

[0288] A comparison of Example 7 and Comparative Example 3 demonstrates that replacing the tetraarylborate anion in the initiator with another anion results in reduced sensitivity and shorter print cycles.

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Abstract

The radiation-sensitive composition and the negative working imageable element include a cationic IR absorber with tetraarylborate counteranion and an onium initiator with tetraarylborate counteranion. The use of these components provides high imaging sensitivity, good shelflife and high print run length.

Description

technical field [0001] The present invention relates to negative-working IR-sensitive compositions and imageable elements, such as negative-working lithographic printing plate precursors, which have increased sens-speed, longer lithographic cycle times, and good shelf life. The invention also relates to methods of producing these imageable elements and to the imaged elements obtained therefrom. Background technique [0002] Negative working 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 free-radically polymerizable component, an initiator system, and optionally a binder, each of which has been the focus of research to provide various combinations of physical properties, imaging properties, and image characteristics. Improve. [0003] Recent developments in the field of printing plate precursors involve the u...

Claims

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Application Information

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IPC IPC(8): B41C1/10B41M5/36C08F2/46C09B69/06G03F7/029B41M5/46
CPCC09B69/06B41M5/465C09B5/60C09B1/51G03F7/029B41M5/368C08F2/50B41C1/1008B41C1/1016B41C2201/02B41C2201/14B41C2210/04B41C2210/06B41C2210/22B41C2210/24Y10T428/24802
Inventor C·辛普森H·鲍曼B·施特勒默尔
Owner EASTMAN KODAK CO
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