Abstract:
The present invention relates to a developer composition for radiation-sensitive positive-working and negative-working and reversible reprographic layers which apart from a radiation-sensitive compound or radiation-sensitive combination of compounds contain, as an essential constituent, a binder which is insoluble in water but soluble in aqueous-alkaline solutions, said developer composition being characterized in that it contains, as essential constituents,(a) O- carboxymethyl- or O,O'-biscarboxymethylethylene glycol or an appropriately substituted polyethylene glycol comprising 2 to about 500 ethylene glycol units,(b) at least one compound showing an alkaline reaction in water, selected from the group including alkali metal hydroxides, alkali metal silicates, alkali metal phosphates, alkali metal borates, ammonium hydroxides, ammonium silicates, ammonium phosphates and ammonium borates, and(c) water.The developer composition gives a very good yield, makes possible short developing times and does not cause any problems due to flaky deposits of layer constituents or foaming. A process for developing positive-working, negative-working and reversible reprographic layers with the developer composition is also disclosed.
Abstract:
The invention relates to a positive-working radiation-sensitive mixture and a copying material produced therefrom on a layer support. The mixture contains as essential constituents a 1,2-quinone diazide or a combination of:1) a compound forming strong acid when exposed to actinic radiation and2) a compound containing at least one acid-cleavable C--O--C bond,and a binder with repeating units of the general formula I ##STR1## wherein R.sub.1 denotes a hydrogen or halogen atom, or a cyanide or an alkyl group,R.sub.2, R.sub.3, R.sub.4 are identical or different and denote hydrogen, or alkyl or aryl groups,R.sub.5, R.sub.6 and optionally R.sub.7 are identical or different and denote hydrogen or halogen atoms, or alkyl, aryl or alkoxy groups, andX denotes the atoms necessary to complete a mononuclear or polynuclear carbocyclic aromatic ring system, andn is 1, 2 or 3.The mixture according to the invention yields lithographic printing plates with a high print run which can be thermally post-cured and have good resistance to chemicals, also photoresists with high heat resistance.