Monoazo blue disperse dye compounds and methods for dyeing or printing hydrophobic fiber materials using the same

A monoazo compound represented by the following formula (I):

• ##STR18## wherein R.sub.1 represents a hydrogen atom or a chlorine atom;
• R.sub.2 represents a phenyl group or a straight chain or branched chain alkyl group which is unsubstituted or substituted;
• R.sub.3 is a hydrogen atom or C.sub.1 -C.sub.4 alkoxy;
• and R.sub.4 and R.sub.5, which are same or different, represent a hydrogen atom, an allyl group, a tetrahydrofurfuryl group, or a straight chain or branched chain C.sub.1 -C.sub.6 alkyl group which is unsubstituted or substituted by one or two substituents selected from a chlorine atom, a bromine atom, a cyano group, an alkoxy group, a phenoxyalkoxy group, a phenoxy group, a phenyl group, a benzyloxy group, an alkoxycarbonyl group, an alkoxycarbonyloxy group, an alkanoyloxy group, a benzoyloxy group, a phenoxycarbonyloxy group, an alkanoyl group, an alkoxyalkoxycarbonyl group, a tetrahydrofurfuryloxy carbonyl group and an alkoxyalkoxy group;
• provided that R.sub.4 and R.sub.5 are not simultaneously hydrogen atoms, and that R.sub.4 and R.sub.5 are not simultaneously straight chain or branched chain C.sub.1 -C.sub.6 alkyl groups which are substituted by one or two substituents selected from a phenoxyalkoxy group, a phenoxy group, a phenyl group, a benzyloxy group, a benzoyloxy group, a phenoxycarbonyloxy group, an alkoxycarbonyl group, an alkoxycarbonyloxy group, and alkanoyloxy group, an alkoxyalkoxycarbonyl group, a tetrahydrofurfuryloxycarbonyl group and a cyano group.