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AssigneeAgfa-Gevaert
InventorsJoan Vermeersch, Dirk Kokkelenberg
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The present invention provides a method for obtaining a lithographic printing plate comprising the steps of (i) image-wise exposing an imaging element comprising on a hydrophilic surface of a support a light sensitive layer containing a diazo resin or a diazonium salt and a dispersed water-insoluble polymer with a melting point or glass transition temperature above 40.degree. C. and capable of coagulating when heated at or above its melting point or glass transition temperature, and (ii) subsequently removing the light sensitive layer in the non-exposed or insufficiently exposed areas of said imaging element by means of rinsing or washing said imaging element with plain water, characterized in that afterwards said developed image-wise exposed imaging element is heat-treated at a temperature at least equal to the glass transition temperature or melting point of said dispersed water-insoluble polymer.
A method for obtaining a lithographic printing plate comprising the steps of (i) image-wise exposing an imaging element comprising on a hydrophilic surface of a support a light sensitive layer containing a diazo resin and a dispersed water-insoluble polymer or a diazonium salt and a dispersed water-insoluble polymer, said dispersed water-insoluble polymer having a melting point or glass transition temperature above 40.degree. C. and capable of coagulation when heated at or above its melting point or glass transition temperature, and (ii) subsequently removing the light sensitive layer in the non-exposed or insufficiently exposed areas of said imaging element by means of rinsing or washing said imaging element with plain water, and thereafter said developed image-wise exposed imaging element being heat-treated at a temperature at least equal to the glass transition temperature or melting point of said dispersed water-insoluble polymer.
Dependencies are inferred from the claim text.