Process for the precipitation of stable colloidal dispersions of

Details Process for the precipitation of stable colloidal dispersions of Process for the precipitation of stable colloidal dispersions of

1988-09-26

1990-06-12

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified radiation sensitive composition with color...

430556, 430557, 430957, G03C 726, G03C 732

Patent

active

049332708

ABSTRACT:
The invention provides a method of forming a dispersion of base degradable hydrophobic component for a photographic system. The invention is accomplished by mixing the component, solvent, and surfactant, at an elevated temperature if necessary, metering the mixture of solvent, surfactant, and hydrophobic component to an excess of water with agitation so as to precipitate from the water solvent solution small particles of the hydrophobic component. The small particles then form a stable dispersion, after washing by dialysis or diafiltration, that will not agglomerate during storage prior to use. The preferred photographic component for use in the system of the invention is an ester terminated photographic coupler that would decompose if subjected to the high pH treatment of prior art procedures.

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Research Disclosure 16468 12/77.
Research Disclosure 19532 7/80.
Chem. Abstracts vol. 95, No. 15925R, Lev, et al.

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