Bisazo dyestuffs based on hydroxynaphthalene carboxylic acid

Details Bisazo dyestuffs based on hydroxynaphthalene carboxylic acid Bisazo dyestuffs based on hydroxynaphthalene carboxylic acid

2005-08-23

2005-08-23

Powers, Fiona T. (Department: 1626)

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

Organic compounds

Azo

C534S830000, C008S437000, C008S654000, C008S687000, C008S916000, C008S918000, C008S919000, C008S920000

Reexamination Certificate

active

06933371

ABSTRACT:
Disclosed are bisazo compounds of the formula Ia or IbwhereR1is hydrogen or methyl,the X groups are independently —CH2CH2— or —CH2CH2CH2—,R2, R3, and R4are independently hydrogen or methyl,A is an anion andn corresponds to the valency of A.Also disclosed are the use of the bisazo compounds for dyeing, especially paper, and colorants containing said bisazo compounds.

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