2-Hydroxy-5-[(2-methoxyphenyl)azo]benzoic acid

Preparation

O-Anisidine diazotized, coupled with 2-Hydroxybenzoic acid.

Properties and Applications

brilliant yellow. Soluble in boiling water for yellow. In concentrated sulfuric acid for yellow brown, dilution after yellow red, then become yellow solution, and accompanied by yellow precipitation. Dye aqueous solution to join hydrochloric acid have yellow precipitation, solution into colloidal; With sodium hydroxide as titian solution and precipitation. Non-crystalline state product melting point 200 ℃. Used for alcohol, esters solvent, grease, paraffin wax, alcohol soluble paint color.

Standard	Light Fastness	Heat-resistant(℃)		water	Sodium Carbonate(5%)	Hydrochloric acid(5%)
		Melting point	Stable
ISO	Good		150	Well	Well	No change