Patent ID: 7196226

Claim:
Mixtures comprising compounds of the formula (I), where R 1 and R 2 are each, independently of one another, C 1 –C 12 -alkyl, C 1 –C 12 -fluoroalkyl, C 4 –C 15 -aryl, C 5 –C 16 -arylalkyl, or [(C 2 –C 12 -alkylene)-O] n (C 1 –C 12 -alkyl)] where n=1 to 5 or are together part of a cyclic radical having a total of from 3 to 24 carbon atoms and R 3 and R 4 are each, independently of one another, C 1 –C 12 -alkyl, C 4 –C 15 -arylalkyl or C 5 –C 16 -aryl or the moiety NR 3 R 4 is a cyclic amino radical having a total of from 3 to 18 carbon atoms or R 1 and/or R 2 and R 3 and/or R 4 are together part of a cyclic radical having a total of from 4 to 18 carbon atoms, at least one aprotic, tertiary amine which has no fluorine atoms in the α-position relative to the nitrogen and/or at least one N-heteroaromatic compound and hydrogen fluoride.