Abstract: The invention relates to a composition comprising a mixture of compounds according to formula (I) wherein IC1 and IC2 independently of one another and of each occurrence represent a hydrocarbyl group, AM independently of each occurrence represents N a hydrocarbyl group, m is the average number of repeating units from 0 to 20, RP1 and RP2 independently of one another and of each occurrence represent an organic group selected from RP3, RP4, RP5, wherein RP3 represents a hydrocarbyl group, RP4 represents an t7 organic group according to formula (II) RP41-(AO)n- wherein RP41 represents a hydrocarbyl group having 1 to 24 carbon atoms, AO represents an alkylene oxide repeating unit and n is the average number of repeating units from 6 to 30, RP5 represents an organic group N according to formula (III) RP51-(AO)p- wherein RP51 represents a hydrocarbyl group having 1 to 24 carbon atoms, AO represents an CN alkylene oxide repeating unit and p is the average number of repeating units from 1 to 5, wherein the mixture co