Chemistry: physical processes – Physical processes – Crystallization
Patent
1991-12-20
1997-04-29
Straub, Gary P.
Chemistry: physical processes
Physical processes
Crystallization
252351, 430546, 430552, 430558, G03C 100
Patent
active
056244673
ABSTRACT:
A process is provided for preparing microprecipitated dispersions of filter dyes by preparing a concentrated slurry in aqueous medium of a filter dye having ionizable acid sites on the dye molecule, adding sufficient aqueous hydroxide to dissolve the filter dye, acidifying the solution with a stoichiometric amount of acidic protons to reprotonate up to 100% of the total ionizable acid sites on the dye molecule and provide a microprecipitated dispersion of the filter dye that is insoluble in aqueous media at pH values less than 3 but soluble in aqueous media at pH greater than 10.
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Gutoff et al, "Dispersions of Spherical Dye Particles by Continuous Precipitation", The American Institute of Chemical Engineers Symposium Series, No. 193, vol. 76, pp. 43-51, 1980 (no month).
Flow Vincent J.
Texter John
Travis William B.
Eastman Kodak Company
Gerlach Robert A.
Ruoff Carl F.
Straub Gary P.
Vanoy Timothy C.
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