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US 4,115,377 AGranted
Rubine mixed strontium-cadmium salts of 3-chloro-4-methyl-6-sulfophenylazo-hydroxynaphthoic acid
AssigneeHercules Incorporated
InventorRichard Knight Putney
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Abstract
Mixed strontium-cadmium salts of the monoazo dyestuff ##STR1## having a gram atom ratio of strontium to cadmium from 1:1 to 5:1 are described. The mixed salts give red pigments which have excellent color and possess good lightfastness and heat stability.
Claims3
A water-insoluble strontium-cadmium salt of the azo dyestuff of the formula ##STR5## said salt having a gram atom ratio of strontium to cadmium ranging from 1:1 to 5:1.
Dependencies are inferred from the claim text.