Process for production of positive images using sulfonic acid precursors
AssigneeCiba-Geigy Corporation
InventorsChristopher G. Demmer, Edward Irving
Life of this patent
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Abstract
Positive images are produced by (i) exposing to actinic radiation in a predetermined pattern a composition supported on a substrate, which composition comprises a film-forming organic material and a substance which releases a sulphonic acid on exposure to actinic radiation, thereby rendering the composition more soluble in the developer in the exposed areas than the unexposed areas, and (ii) treating the composition with the aqueous base developer to remove the unexposed areas. The image-forming process may be used in the production of printing plates and electrical circuits.
Claims20
A process for the production of an image comprising
- (i) forming a composition which comprises
- (A) a film-forming organic material consisting essentially of an aqueous base-soluble material having a phenolic hydroxyl group or a carboxylic, sulfonic, phosphonic or phosphoric acid group, and
- (B) a substance which releases a sulfonic acid on exposure to actinic radiation, thereby effecting a reduction of the dissolution rate of said film-forming material in aqueous base, and
- (ii) exposing said composition to actinic radiation in a predetermined pattern, thereby nullifying said dissolution rate reduction to render the composition more soluble in an aqueous base developer in exposed areas than in unexposed areas, and
- (iii) removing the composition in the exposed areas by treatment with the aqueous base developer.
Dependencies are inferred from the claim text.