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US 4,265,811 AGranted
Novel azo dyes
AssigneePolaroid Corporation
InventorElbert M. Idelson
Life of this patent
Estimating the term…
Abstract
There are described novel compounds which are chrome-complexed dyes and which include an ortho, ortho' dihydroxyazo dye moiety, an onium salt and a ligand which is a radical of an iminodiacetic acid.
Claims8
A compound which is represented by the structural formula:
- ##STR7## wherein A is a radical of benzene or naphthalene, B is a radical of benzene or naphthalene or a nitrogen containing heterocyclic radical, X is a cation, R.sub.1 and R.sub.2 may be H or when taken together may represent the carbon atoms necessary to complete a five or six member heterocyclic moiety and R.sub.3 may be H or alkyl having from 1 to 6 carbon atoms.
Dependencies are inferred from the claim text.