Patent ID: 7695820

Claim:
A lubricant, comprising an aliphatic polyester, comprising: monomer units of formula III where R 11 , R 12 , R 13 , R 14 and R 15 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, e is 0 or 1, f is 0 or 1 when e is 0, and f is 1 when e is 1; where, when e is 1 and R 13 contains 2 or 3 carbon atoms, at least one of R 11 and R 14 contains from 2 to 10 carbon atoms; and monomer units of formula II where R 6 , R 7 , R 8 , R 9 and R 10 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, c is 0 or 1, d is 0 or 1 when c is 0, and d is 1 when c is 1, where the polyester further comprises monomer units of formula III′ where Q 11 and Q 14 are ethyl groups, Q 12 , Q 13 and Q 15 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, g is 0 or 1, h is 0 or 1 when g is 0, and h is 1 when g is 1.