The present invention relates to an alkaline detergency azo dyes having a detergency in a weak alkaline condition and then dyeing it with a phthalimide structure side chemical structural diazo component polyester fiber materials. ; Alkaline detergency azo dyes of the present invention is characterized by the structural formula azobenzene-based monoazo compound having a (I) below. ; (I) ; Wherein X is hydrogen, methyl or ethyl group, Y 1 and Y 2 is hydrogen, methyl, and methoxy or acetylamino group, R 1 and R 2 is a substituted alkyl group or not respectively substituted. ; Using the dyes of the present invention when reducing the cleaning process the alkali washing in step can be replaced with, as well as to alleviate the high pH and BOD problem of the dye that was caused by the use of a reduced washing liquid waste, polyester / cotton blend fabric also in the dyeing of the material is possible is efficient and economical method 1 dye bath. ; Disperse Dyes, phthalimide group, dyeing, one yokbeop, azo
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