Preparation of rhodamine dyes in granule form by direct cooling

Details Preparation of rhodamine dyes in granule form by direct cooling Preparation of rhodamine dyes in granule form by direct cooling

1989-09-08

1990-12-11

Higel, Floyd D.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549225, 549226, C07D31182

Patent

active

049772783

ABSTRACT:
Salts of esterified rhodamine dyes are prepared in granular form by precipitating the rhodamine dyes with sodium chloride from an aqueous medium containing a water-miscible solvent by adding the sodium chloride at 80.degree.-100.degree. C., which precipitates the dyes in liquid form from the aqueous medium, then stirring the liquid dyes to convert them into a droplet form and then chilling the droplets by direct cooling to below 65.degree. C.

REFERENCES:
patent: 2576293 (1951-11-01), France et al.
patent: 3708499 (1973-01-01), Andree et al.
patent: 3767358 (1973-10-01), Stryker
patent: 3883529 (1975-05-01), Austin
patent: 4165434 (1979-08-01), Schafer et al.
patent: 4749796 (1988-06-01), Sensui et al.

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