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US 4,115,404 AGranted
Benzodifuran dyestuffs
AssigneeImperial Chemical Industries PLC
InventorsColin William Greenhalgh, John Laurence Carey, David Francis Newton
Life of this patent
Estimating the term…
Abstract
Substituted 2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b.sup.1 ]difurans or -dipyrroles and processes for their manufacture. The compounds are dyestuffs which are particularly useful in the form of aqueous dispersions for application to polyester textile materials.
Claims1
A dyestuff which contains a chromophoric system of the formula:
- ##STR16## wherein each Z is oxygen;
- R.sup.1 and R.sup.2 each independently represent a radical selected from the class consisting of naphthyl, unsubstituted phenyl and phenyl having at least one substituent selected from the class consisting of sulphonic acid, sulphonyl chloride, phenylaminosulphonyl, nitro, lower alkyl, lower alkoxy, halogeno, lower alkoxyphenyl, lower alkoxycarbonyl, amino, lower alkylamino and acetylamino;
- and
- X.sup.1 and X.sup.2 each independently represent a hydrogen atom or a substituent selected from the class consisting of chlorine and bromine atoms and lower alkyl groups.
1 more element
Dependencies are inferred from the claim text.