Patent ID: 8476435

Claim:
A method for producing a fluorine-containing polyether carboxylic acid amide represented by the formula: C n F 2n+1 O(C 3 F 6 O) m RfCONHAr [I] wherein Rf is a fluorocarbon group of 1 to 2 carbon atoms, Ar is a nitrogen-containing heterocyclic group, n is an integer of 1 to 3, and m is an integer of 10 to 30, the method comprising reacting a fluorine-containing polyether carboxylic acid fluoride represented by the formula: C n F 2n+1 O(C 3 F 6 O) m RfCOF [II] wherein Rf, n, and m are as defined above, with a nitrogen-containing heterocyclic amine compound represented by the formula: ArNH 2 [III] wherein Ar is as defined above; wherein the reaction is carried out while a reaction temperature is first increased to 80 to 100° C., and then increased at a temperature increase rate that produces a temperature difference of 3 to 5° C. after 48 hours.