Patent ID: 8809577

Claim:
A process to prepare fluorinated sulfobetaine compounds of formula (I) wherein R f is C 2 to C 10 fluoroalkyl optionally interrupted by one or more of O, CH 2 , CHF, or combinations thereof; R 1 is C 1 to C 10 alkylene or a chemical bond; R 2 is C 1 to C 6 alkylene; R 3 is H or CH 3 ; R 4 is C 1 to C 6 alkylene containing at least one hydroxyl group; R 5 is H or CH 3 ; and R 6 is H or CH 3 ; comprising contacting a fluorinated sulfonamide amine of formula (II) wherein R f , R 1 , R 2 , R 3 , R 5 and R 6 are each defined as in Formula (I); with an aliphatic chlorosulfonic acid or salt thereof of formula (III) wherein R 4 is C 1 to C 6 alkylene containing at least one hydroxyl group; X is chlorine; and M is Na, K, Li, or Ca; in the presence of water and at least one alkylene glycol, and optionally at least one alkyl carbonate, wherein the ratio of water to the total amount of alkylene glycol and optional alkyl carbonate is from about 1:19 to about 1:3.