POSITIVE-WORKING, INFRARED-SENSITIVE LITHOGRAPHIC PRINTING PLATE AND METHOD OF IMAGING

A positive-working, infrared imageable coating and a lithographic printing plate or other element with the coating are described. The coating is a phenolic resin containing an o-diazonaphthoquinone derivative which couples or reacts with the resin to partially insolubilize the coating and an infrare...

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Bibliographic Details
Main Authors FROMSON, HOWARD, A, GRACIA, ROBERT, F, ROZELL, WILLIAM, J, REN, YIJIN
Format Patent
LanguageEnglish
French
German
Published 22.12.2004
Edition7
Subjects
APPARATUS SPECIALLY ADAPTED THEREFOR
CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHY
LINING MACHINES
MATERIALS THEREFOR
ORIGINALS THEREFOR
PERFORMING OPERATIONS
PHOTOGRAPHY
PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES
PHYSICS
PRINTING
PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTINGSURFACES
STAMPS
TRANSPORTING
TYPEWRITERS
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Summary:A positive-working, infrared imageable coating and a lithographic printing plate or other element with the coating are described. The coating is a phenolic resin containing an o-diazonaphthoquinone derivative which couples or reacts with the resin to partially insolubilize the coating and an infrared absorbing dye or pigment which further insolubilizes the coating and which renders the coating imageable by infrared radiation. The coating contains only that quantity of infrared radiation absorber necessary to be imageable and only that small quantity of o-diazonaphthoquinone derivative necessary to supplement the insolubilizing function of the absorber. Specifically, the absorber is from 1 to 10 weight percent of the total dry weight of the coating and the dry weight ratio of the absorber to the diazonaphthoquinone moiety is greater than 1:5 and preferably 1:2 or greater. By replacing a portion of expensive dye with some less expensive o-diazonaphthoquinone derivative to obtain the necessary degree of insolubility, the cost of the coating is greatly reduced.
Bibliography:Application Number: EP20010924444