Method of preparing dispersions of photographically useful compounds
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United States of America Patent
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May 19, 1998
Grant Date -
N/A
app pub date -
Jul 17, 1996
filing date -
Jul 24, 1995
priority date (Note) -
Expired
status (Latency Note)
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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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