Patent ID: 8557756

Claim:
A composition comprising: (a) a first surfactant of formula I: wherein R is linear or branched C 2 -C 22 alkyl; R 1 , R 2 , and R 3 are independently H or linear or branched C 1 -C 18 alkyl; Y is SO 3 − or N + R 4 R 5 R 6 ; R 4 , R 5 , and R 6 are independently C 1 -C 4 alkyl, aryl-C 1 -C 4 alkyl, or R 4 and R 5 , together with the nitrogen to which they are attached, form a ring containing 3-9 carbon atoms; X is a monovalent or divalent ion; n is an integer such that the total ionic charge provided by X n is 2; and (b) a second surfactant that is oppositely charged to the first surfactant.