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Polymeric dyes, overcoat compositions and thermal lithographic printing plates

a technology of polymeric dyes and compositions, applied in printing, printing, ball sports, etc., can solve the problems of increased costs, inability to handle or process plates under natural light, and severe background staining

Inactive Publication Date: 2009-02-05
AMERICAN DYE SOURCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]It is an object of the present invention to provide an overcoat composition for thermal lithographic offset printing plates allowing the production an overcoat layer for these plates so that they can be handled and processed in a white light environment and do not require interleaving papers for packaging and transporting.

Problems solved by technology

In fact, these initiators react with white light and cause many problems such as (often severe) background staining.
This means that the plates cannot be handled or processed under natural light.
Another problem with prior art printing plates arises from the fact that they are usually stacked on top of each other during shipping and storage.
This is disadvantageous because the interleaving papers increase costs and must be removed manually prior to imaging (which further add to costs).
If the papers are not removed, they will cause paper jams in the automatic plate loading plate-setters used to load the plate in the printing machines.

Method used

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  • Polymeric dyes, overcoat compositions and thermal lithographic printing plates
  • Polymeric dyes, overcoat compositions and thermal lithographic printing plates
  • Polymeric dyes, overcoat compositions and thermal lithographic printing plates

Examples

Experimental program
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Effect test

example 1

[0116]Water-soluble polymeric dye, PD1-01 was synthesized by adding 84.7 grams (0.9 moles) of 1-vinylimidazole and 3.68 grams (0.1 moles) of Disperse Red 1 Acrylate into 700 ml of de-ionized water in a three neck flask. The solution was heated at 80° C. under nitrogen atmosphere for 30 minutes. Under constant stirring, 10 grams of 2,2′-azobis(2-methylpropionamidine) dihydrochloride (which acts as a free radical initiator) suspension in water were added and the solution was refluxed for 1 hour. Subsequently, 5 grams of 2,2′-azobis(2-methylpropionamidine) dihydrochloride were added and the solution was again refluxed for one hour. Finally, 5 grams of 2,2′-azobis(2-methylpropionamidine) dihydrochloride were added and the solution was heated at 80° C. for 10 hours.

[0117]A reddish solution of polymeric dye was obtained and the solid content was adjusted to 10% with de-ionized water. The maximum absorption band of the obtained polymeric dye was observed at around 503 nm. The obtained prod...

example 2

[0118]Water-soluble polymeric dye, PD1-02 was synthesized by adding 100.0 grams (0.9 moles) of 1-vinyl-2-pyrrolidone and 4.0 grams (0.1 moles) of Disperse Red 13 Acrylate into 700 ml of de-ionized water in a three neck flask. The solution was heated at 80° C. under nitrogen atmosphere for 30 minutes. Under constant stirring, 10 grams of 2,2′-azobis(2-methylpropionamidine) dihydrochloride suspension in water were added and the solution was refluxed for 1 hour. Subsequently, 5 grams of 2,2′-azobis(2-methylpropionamidine) dihydrochloride were added and the solution was again refluxed for one hour. Finally, 5 grams of 2,2′-azobis(2-methylpropionamidine) dihydrochloride were added and the solution was heated at 80° C. for 10 hours.

[0119]A reddish solution of polymeric dye was obtained and the solid content was adjusted to 10% with de-ionized water. The maximum absorption band of the obtained polymeric dye was observed at around 503 nm. The obtained product was ready for use in the prepar...

example 3

[0120]Water-soluble polymeric dye, PD1-03, was synthesized by adding 64.8 grams (0.95 moles) of acrylic acid and 4.2 grams (0.05 moles) of Direct Red 81 Methacrylate into 700 ml of de-ionized water in a three neck flask. The solution was heated at 80° C. under nitrogen atmosphere for 30 minutes. Under constant stirring, 10 grams of 2,2′-azobis(2-methylpropionamidine) dihydrochloride suspension in water were added and the solution was refluxed for 1 hour. Subsequently, 5 grams of 2,2′-azobis(2-methylpropionamidine) dihydrochloride were added and the solution was again refluxed for one hour. Finally, 5 grams of 2,2′-azobis(2-methylpropionamidine) dihydrochloride were added and the solution was heated at 80° C. for 10 hours.

[0121]A reddish solution of polymeric dye was obtained and the solid content was adjusted to 10% with de-ionized water. The maximum absorption band of the obtained polymeric dye was observed at around 503 nm. The obtained product was ready for use in the preparation...

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Abstract

A thermal lithographic printing plate overcoat composition comprising (a) a water-soluble polymeric dye having an absorption band between about 300 and about 600 nm; and (b) micro-particles or nano-particles is provided. A negative-working thermal lithographic printing plate comprising (a) a hydrophilic substrate; (b) a near infrared imaging layer disposed on the hydrophilic substrate; and (c) an overcoat layer disposed on the imaging layer, said overcoat layer comprising a water-soluble polymeric dye having an absorption band between about 300 and about 600 nm; and micro-particles or nano-particles is also provided. Finally, a water-soluble polymeric dye having an absorption band between about 300 and about 600 nm is provided.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority, under 35 U.S.C. § 119(e), of U.S. provisional application Ser. No. 60 / 952,963, filed on Jul. 31, 2007. All documents above are incorporated herein in their entirety by reference.FIELD OF THE INVENTION[0002]The present invention relates to polymeric dyes, overcoat compositions and to thermal lithographic printing plates. More specifically, the present invention is concerned with polymeric dyes and overcoat compositions containing these dyes for protecting the imaging layer of thermal lithographic printing plates. The present invention is also related to thermal lithographic printing plates comprising these overcoat compositions.BACKGROUND OF THE INVENTION[0003]Thermal lithographic offset printing plates are known in the prior art. For examples, U.S. Pat. Nos. 6,124,425 and 6,177,182 taught to prepare positive and negative working printing plates comprising a radiation sensitive layer that can be imaged wit...

Claims

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Application Information

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IPC IPC(8): G03F7/11G03F7/004C08G73/00C08G63/00C08K3/34C08K3/22C08F8/00
CPCB41C1/1016Y10T428/25C08F290/061C08L33/12C08L2205/22C09B69/106C09B69/109C09D5/024C09D139/04C08F290/06B41C2210/24B41C2201/02B41C2201/10B41C2201/14B41C2210/04B41C2210/08B41C2210/22C08L2666/04Y10T428/31504Y10T428/31935
Inventor NGUYEN, MY T.LOCAS, MARC-ANDRE
Owner AMERICAN DYE SOURCE
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