Patent ID: 8349930

Claim:
A compound of the formula wherein R 1 is an alkyl, alkenyl or alkynyl group containing x carbon atoms, wherein x is from 1 to 10 wherein one of R 2 and R 3 is an alkyl, alkenyl or alkynyl group containing y carbon atoms, wherein y is from 1 to 10, wherein the other of R 2 and R 3 is a branched group of the formula wherein q is from 0 to 3, wherein each R 5 is independently selected from —OH and —O—C(O)—R 4 wherein n is from 10 to 20 and m is selected from 2n-q, 2n-2-q, 2n-4-q, and 2n-6-q, wherein each R 4 is independently selected from alkyl, alkenyl and alkynyl groups containing z carbon atoms, wherein z is from 7 to 21, wherein z is different to at least one of x and y.