Method of making a positive photosensitive lithographic printing plate
A positive photosensitive lithographic printing plate which is capable of being operated under white light containing ultraviolet light, said printing plate comprising on a support a positive photosensitive composition which shows, upon scanning exposure to light in the wavelength range from 650 to...
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Main Authors | , |
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Format | Patent |
Language | English French German |
Published |
17.05.2017
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Subjects | |
Online Access | Get full text |
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Summary: | A positive photosensitive lithographic printing plate which is capable of being operated under white light containing ultraviolet light, said printing plate comprising on a support a positive photosensitive composition which shows, upon scanning exposure to light in the wavelength range from 650 to 1300 nm, by a change other than a chemical change, a difference in solubility in an alkali developer between an exposed portion and a non-exposed portion, characterized in that said composition comprises
(i) a dye which absorbs said light,
(ii) an alkali-soluble resin and
(iii) a solubility-surpressing agent which is capable of lowering
the dissolution in an alkaline developer of a blend comprising the dye and the alkali-soluble resin,
with the proviso that the solubility-surpressing agent is not selected from the group consisting of a quinolinium compound, a benzothiazolium compound, a pyridinium compound and an imidazoline compound. |
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Bibliography: | Application Number: EP20040016020 |