Patent ID: 7253138

Claim:
A compound of the formula (1) where R 1 is selected from the group consisting of C 1 - to C 22 -alkyl, C 2 - to C 22 -alkenyl, C 6 - to C 30 -aryl, C 7 - to C 30 -alkylaryl, —CHR 5 —COO − , and —O −, R 2 is hydrogen, —OH 3 or —OH, R 3 , R 4 are each independently C 1 - to C 22 -alkyl, C 2 - to C 22 -alkenyl, C 6 - to C 30 -aryl or C 7 - to C 30 -alkylaryl, R 5 is hydrogen, C 1 - to C 22 -alkyl or C 2 - to C 22 -alkenyl, A is a C 2 - to C 4 -alkylene group, D is a C 2 - to C 5 -alkylene group, m is a number from 1 to 30, n is a number from 1 to 18.