Process for preparing radiation sensitive materials

Abstract

Abstract A DISPERSION OF A RADIATION SENSITIVE SILVER HALIDE WITH A HEAVY METAL SALT OF A FATTY ACID IN A LIQUID MEDIUM IS PREPARED BY (A) PROVIDING AN OLEOPHILIC PRECIPITATE CONTAINING A RADIATION SENSITIVE SILVER HALIDE AND A SURFACTANT WHICH HAS THE PROPERTY OF MAKING THE SILVER HALIDE OLEOPHILIC, (B) DISPERSING THE OLEOPHILIC PRECIPITATE IN A SOLUTION OF AN ALKALI METAL OR AMMONIUM SALT OF A FATTY ACID AT LEAST AT A TEMPERATURE AT WHICH THE FATTY ACID SALT IS MAINTAINED IN SOLUTION, THEN (C) LOWERING THE TEMPERATURE AND PH OF THE PRODUCT OF (B) UNTIL SUBSTANTIALLY ALL OF THE FATTY ACID COMPOUND IS PRESENT IN THE SOLUTION AS A SOLID PHASE, AND THEN (D) CONVERTING AT LEAST PART OF THE FATTY ACID COMPOUND TO A HEAVY METAL SALT BY ADMIXING A SOURCE OF HEAVY METAL IONS WITH THE PRODUCT OF (C). THIS METHOD IS CONVENIENTLY CARRIED OUT BY MIXING A RADIATION SENSITIVE SILVER HALIDE GELATINO EMULSION WITH THE SURFACTANT IN (A). (A) AND (B) CAN BE CARRIED OUT BY PRECIPITATING THE RADIATION SENSITIVE SILVER HALIDE IN A SOLUTION OF THE ALKALI METAL OR AMMONIUM SALT OF THE FATTY ACID. THIS PROCESS ELIMINATES THE NEED FOR BALL MILLING AND PERMITS PREPARATION OF A PARTICULATE SOLID SUITABLE FOR MIXING THE COMPONENTS OF PHOTOSENSITIVE MATERIALS FOR PROCESSING WITH HEAT.

Inventors

• 👤 W Miller
• 👤 R Baxendale

Bibliographic Details