Process for drying solid photographic addenda

Details Process for drying solid photographic addenda Process for drying solid photographic addenda

1990-01-23

1990-08-07

Shah, Mukund J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

564153, 430543, 430554, 430556, C07D23122, C07C23500, C07C23538

Patent

active

049469657

ABSTRACT:
Solid photographic addenda, such as photographic color couplers or sensitizing dyes, which are wet with occluded organic liquid, after being subjected, for example, to processes such as crystallization or washing, are contacted with an extractant composed of carbon dioxide in liquid form or in the form of a supercritical fluid to remove the organic liquid. The process is capable of use with any solid photographic addendum which is insoluble in the extractant and any organic liquid which is soluble in the extractant. It can be completed much more quickly than conventional processes in which such solids are dried with the aid of heat and/or vacuum, while effectively avoiding problems of clumping and thermal degradation which commonly occur in dryers. It provides a product that is capable of meeting the demanding requirements of the photographic art with respect to both physical and chemical characteristics.

REFERENCES:
patent: 3966981 (1976-03-01), Schultz
patent: 3969196 (1976-05-01), Zosel
patent: 4250331 (1981-07-01), Shimshick
patent: 4308200 (1981-11-01), Fremont
patent: 4632837 (1986-08-01), Schutz

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