Levelling agent and process for the even dyeing of materials made of synthetic fibers

摘要

Disclosed is a polycondensate of (a) water soluble or dispersible polyester having a molecular weight of 600-5000 prepared by reacting a carboxylic acid and a diol or polyol wherein 5-40 moles percent of the acid or hydroxy compounds contain sulfo substituents and (b) a compound of the formula R-O-(CH2CH2O)m-CH2CH2OH wherein m is a number from 5 to 50 and R is selected from the group consisting of alkyl of 6-22 carbon atoms, alkenyl of 6-22 carbon atoms, alkanoyl of 6-22 carbon atoms, aryl of 6-22 carbon atoms, aralkyl of 6-22 carbon atoms, castor oil radical and <IMAGE> wherein R' is alkyl or alkenyl each having 6-22 carbon atoms. The polycondensate is useful as a modifier for aminoplast resins and as a leveller in dyeing.