Preparation of solutions for use in photography
AssigneeEastman Kodak Company
InventorsDavid R. Bendle, David G. N. English, Jeremy S. Foster
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Abstract
The present invention is a process for continuous preparation of solutions of water-immiscible or water-insoluble organic compounds in substantially non-aqueous organic solvents. Particularly, a process for the continuous preparation of colour forming coupler solutions for use in the photographic industry is described. The process uses a twin screw extruder wherein the compound to be dissolved is introduced into a first section of the extruder. The compound passes along the extruder interior to a section where organic solvent is introduced to form the required solution.
Claims10
A process for the continuous preparation of solutions of water-immiscible or water-insoluble organic compounds in substantially non-aqueous organic solvents characterised in that a compound to be dissolved is introduced into a first section of a twin screw extruder and passes along the extruder interior in the direction of flow to a second section of the extruder into which an organic solvent is introduced to form the required solution, the temperature in the extruder interior being maintained at appropriate levels along its length.
Dependencies are inferred from the claim text.