Method of preparing dispersions of photographically useful compo

Details Method of preparing dispersions of photographically useful compo Method of preparing dispersions of photographically useful compo

1996-07-17

1998-05-19

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Use of sound or nondigital compressive force

430449, 430517, 430522, 430546, 430566, 430631, 430935, 2523635, 241 16, 23295R, G03C 1015, G03C 1025, G03C 138, G03C 7388

Patent

active

057533903

ABSTRACT:
A method is described for preparing a concentrated dispersion of a photographically useful compound ready-for-use in coating solutions of hydrophilic colloid layers of a silver halide photographic material, wherein said compound has at least one ionisable acid site on its molecule, the said method comprising the steps of deprotonising and solubilising the said compound in alkaline medium; microprecipitating the said compound and milling the microprecipitated compound obtained, coating the said dispersion of a photographically useful compound in non-light-sensitive and/or light-sensitive hydrophilic layers of a silver halide photographic material, wherein milling proceeds during and/or after the microprecipitating step.

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