Process for making etching resists and photographic stripping film for use in such process

Abstract

Abstract AN ETCHING RESIST ON A METALLIC SURFACE TO BE ETCHED IS PRODUCED BY MEANS OF A PHOTOGRAPHIC STRIPPING FILM WHICH INCLUDES DIRECTLY ATTACHED TO THE FILM SUPPORT A LAYER ESSENTIALLY CONSISTING OF HYDROPHILIC COLLOID AND A SYNTHETIC POLYMERIC MATERIAL WHICH HAS BEEN MIXED AS A LATEX WITH THE HYDROPHILIC COLOID, WHICH LAYER IS AT LEAST WATERPERMEABLE, IF NOT WARM WATER SOLUBLE. AFTER THE FILM IS EXPOSED AND A HARDENED RELIEF IMAGE IS PRODUCED, THE METALLIC SURFACE IS WET WITH A LIQUID WHICH HAS A SWELLING ACTION FOR HYDROPHILIC COLLOIDS LESS THAN THAT OF PURE WATER. THE FILM IS APPLIED T THE WET METAL SURFACE, THE FILM SUPPORT IS REMOVED BY STRIPPING AND THE REMAINDER OF THE FILM IS DEVELOPED TO PRODUCE A HARDENED, WATER-INSOLUBLE RELIEF IMAGE WHICH IS THEN FINALLY DRIED. IN ONE EMBODIMENT AN UNHARDENED, LIGHT-SENSITIVE LAYER, SOLUBLE IN WARM WATER, IS PROVIDED ON A SEPARATE COLLOID-LATEX LAYER, THE LIGHT-SENSITIVE LAYER BEING ADAPTED TO FORM A HARDENED WATER-INSOLUBLE RELIEF IMAGE, THERE BEING NO ANCHOR REMAINING INSOLUBLE IN WARM WATER FORMED BETWEEN THE LIGHT-SENSITIVE LAYER WHEN IN HARDENED CONDITION AND THE COLLOID-LATEX LAYER, AT LEAST IF THE LATTER LAYER IS INSOLUBLE IN WARM WATER. IN ANOTHER EMBODIMENT, THE COLLOID-LATEX LAYER ITSELF CONSITUTES THE UNHARDENED, WARM WATER SOLUBLE LIGHT-SENSITIVE LAYER ADAPTED TO FORM A HARDENED, WATER-INSOLUBLE RELIEF IMAGE. PREFERABLY, THE RATIO OF THE SYNTHETIC POLYMERIC MATERIAL TO THE HYDROPHILIC COLLOID, IS BETWEEN ABOUT 1:1 AND 6:1.

Inventors

• 👤 Johan Lodewijk Verelst
• 👤 Albert August Reyniers

Bibliographic Details