Sulfonated disazo dyestuffs containing an ether group
AssigneeCiba-Geigy Corporation
InventorAlfred Fasciati
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Abstract
Disazo compounds of the formula ##SPC1## In which R.sub.1 represents a sulphobenzene or sulphonaphthalene radical, B.sub.1, B.sub.2, E.sub.1 and E.sub.2 each represents a hydrogen atom, a low molecular alkyl or alkoxy radical, R.sub.2 represents a low molecular alkylene radical, X represents a functional radical, and --OR.sub.2 --X is in the ortho- or para-position to the azo bridge, and process for the preparation of these dyestuffs. These dyestuffs provide natural and synthetic polyamides, e.g. wool and nylon, with dyeings of excellent general fastness properties.
Claims10
A disazo compound of the formula ##SPC8## in which R.sub.1 is mono- or disulfonated phenyl or naphthyl which, in addition to said sulfo groups is further unsubstituted or substituted by chlorine, lower alkyl or lower alkoxy,
- B.sub.1, b.sub.2, e.sub.1 and E.sub.2 each is hydrogen, lower alkyl or lower alkoxy,
- R.sub.2 is low molecular alkylene, vinylene or propylene,
- X is chloro hydroxyl cyano, lower alkoxy, phenoxy, carboxyl, lower alkanoyl, lower alkoxycarbonyl, benzoyl benzoyl, or 1,2 epoxyethyl or 2,3-epoxypropyl, and -OR.sub.2 -X is in the ortho- or para-position to the azo bridge.
Dependencies are inferred from the claim text.