Patent ID: 8067528

Claim:
A 2-acyloxycarboxylic acid derivative which is represented by the general formula (I): wherein Rf 1 and Rf 2 are the same or different and each represents H, F, a fluoroalkyl group containing 1 to 20 carbon atoms or an ether oxygen-containing fluoroalkyl group containing 1 to 20 carbon atoms, Rf represents a fluoroalkyl group containing 1 to 20 carbon atoms or an ether oxygen-containing fluoroalkyl group containing 1 to 20 carbon atoms, M represents H, NH 4 , Li, Na or K, a and b each represents an integer of 0 to 2 and d represents an integer of 1 to 3 provided that a, b and d satisfy the relation a+b+d=3; Rf 1 , Rf 2 and Rf are the same or different.