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US 6,933,371 B2Granted
Bisazo dyestuffs based on hydroxynaphthalene carboxylic acid
AssigneeBASF SE
InventorsGunter-Rudolf Schröder, Sophia Ebert, Karl-Heinz Etzbach, Rainer Tresch, Rüdiger Sens
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Abstract
Disclosed are bisazo compounds of the formula Ia or Ib where R1 is hydrogen or methyl, the X groups are independently —CH2CH2— or —CH2CH2CH2—, R2, R3, and R4 are independently hydrogen or methyl, A is an anion and n 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.
Claims4
Bisazo compounds of the formula Ia or Ib
- where
- R1 is hydrogen or methyl,
- the X groups are independently —CH2CH2— or —CH2CH2CH2—,
- R2, R3, and R4 are independently hydrogen or methyl,
- A is an anion and
- n corresponds to the valency of A.
3 more elements
Dependencies are inferred from the claim text.