Composition comprising at least one compound of formula and at least one compound of formula and further comprising an alcohol of formula, R 4 -OH where all R 1 and R 2 each independently stand for H or for linear or branched alkyl of 1 to 5 carbon atoms, preferably for CH 3 or C 2 H 5 or C 3 H 7, or for or for where m is a number from 4 to 8 and t is 0 or 1 and q is a number from 1 to 3, all R 3 each independently stand for H or for -CH 2 -O-R 2, X stands for O, R 4 stands for a linear or optionally branched alkyl of 1 to 18, preferably 1 to 4, carbon atoms, more preferably for CH 3 or C 2 H 5, R 5 stands for linear or branched alkyl or alkenyl of 4 to 18, preferably 8 to 18 carbon atoms, more preferably for branched alkyl of 13 carbon atoms, or for an aromatic moiety optionally substituted by one or more hydrocarbyl moieties, in particular for phenyl, tolyl or benzyl, one of R 6 and R 7 stands for H while the other stands for H or for CH 3, I stands for a number from 0 to 20, preferably from 2 to 20, more preferably from 2 to 8, in particular for 2 to 6, where in the presence of a compound of formula with I = 0 a compound of formula with I >= 2 must also be present, where R 12 stands for H or linear or optionally branched alkyl of 1 to 4 carbon atoms, preferably for CH 3 or t-C 4 H 9, more preferably for H, where R 13 stands for H or a linear or optionally branched alkyl of 1 to 4 carbon atoms, preferably for H or n-C 4 H 9, wherein the composition comprises a reaction product of one or more compounds of formulae with one or more compounds of formula and of formula wherein at least a compound of formula with I = 6-8 and t = 0 is present. and at least one compound of formula and further comprising an alcohol of formula, R 4 -OH where all R 1 and R 2 each independently stand for H or for linear or branched alkyl of 1 to 5 carbon atoms, preferably for CH 3 or C 2 H 5 or C 3 H 7, or for or for where m is a number from 4 to 8 and t is 0 or 1 and q is a number from 1 to 3, all R 3 each independently stand for H or for -CH 2 -O-R 2, X stands for O, R 4 stands for a linear or optionally branched alkyl of 1 to 18, preferably 1 to 4, carbon atoms, more preferably for CH 3 or C 2 H 5, R 5 stands for linear or branched alkyl or alkenyl of 4 to 18, preferably 8 to 18 carbon atoms, more preferably for branched alkyl of 13 carbon atoms, or for an aromatic moiety optionally substituted by one or more hydrocarbyl moieties, in particular for phenyl, tolyl or benzyl, one of R 6 and R 7 stands for H while the other stands for H or for CH 3, I stands for a number from 0 to 20, preferably from 2 to 20, more preferably from 2 to 8, in particular for 2 to 6, where in the presence of a compound of formula with I = 0 a compound of formula with I >= 2 must also be present, where R 12 stands for H or linear or optionally branched alkyl of 1 to 4 carbon atoms, preferably for CH 3 or t-C 4 H 9, more preferably for H, where R 13 stands for H or a linear or optionally branched alkyl of 1 to 4 carbon atoms, preferably for H or n-C 4 H 9, wherein the composition comprises a reaction product of one or more compounds of formulae with one or more compounds of formula and of formula wherein at least a compound of formula with I = 6-8 and t = 0 is present.