Patent ID: 7163982

Claim:
A process for preparing a fluorine-containing polymer (B1) having a protective group by using a fluorine-containing polymer (A1) having OH group which has a moiety represented by the formula (1): wherein Rf is a fluorine-containing alkyl group having 1 to 5 carbon atoms, and converting the moiety of the formula (1) to a moiety represented by the formula (2): wherein Rf is as defined in said formula (1), R is a hydrocarbon group having 1 to 30 carbon atoms, in which a part or the whole of hydrogen atoms may be substituted with fluorine atoms, said process for preparing the fluorine-containing polymer (B1) having the moiety of the formula (2) is characterized in that at least one base selected from ammonia and organic amines and a compound of the formula (3): X—CH 2 OR (3) wherein X is Cl, Br or I; R is as defined in the formula (2), are reacted with the fluorine-containing polymer (A1) having OH group in a solvent which can uniformly dissolve a mixture of the fluorine-containing polymer (A1) having OH group and ammonia or organic amines.