Sulphur dye compositions and their production

Details Sulphur dye compositions and their production Sulphur dye compositions and their production

C - Chemistry, Metallurgy

09

B

C09B 67/28 (2006.01) C09B 67/30 (2006.01) D06P 1/30 (2006.01)

Patent

CA 2095347

2095347 9307221 PCTABS00021 A starting sulphur dye is treated in an aqueous reducing medium, preferably an aqueous mixture of alkali and reducing sugar, to form a solution which is then oxidized to form a slurry of dye particles having improved characteristics and which may be processed to fine sulphur dye dispersions of controlled narrow range particle size.

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