Benzoic acid, 2-hydroxy-5-[(4'-hydroxy[1,1'-biphenyl]-4-yl)azo]-, monosodium salt

Preparation

4-(4-Aminophenyl)benzenamine diazotization, and 2-Hydroxybenzoic acid?coupling, and then and dilute sulphuric acid common boiling, make the remnants of diazo into alcohol.

Properties and Applications

green yellow. Moderate soluble in water for green light yellow, slightly soluble in Etanol and Cellosolve and Acetone, insoluble in other organic solvent. In concentrated sulfuric acid to red light purple, dilution after light yellow, green brown precipitation.?Dye solution was added concentrated hydrochloric acid to light brown light olive; adding concentrated sodium hydroxide solution was orange.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	5	4-5	4	2	4-5	4	5
AATCC	3-4	4-5	4		5	4	4-5