Fluorine-containing polyether monomer, and polymer and surface treatment agent comprising the same

A method of producing a fluorine-containing polyether monomer, which comprises:

• reacting a fluorine-containing alkylene oxide of the formula:
• Rf—A2—Y (III)
• wherein Rf is a perfluoroalkyl group having 1 to 18 carbon atoms,
• A2 is a direct bond, or a divalent linear or branched aliphatic group having 1 to 10 carbon atoms which may have an ether linkage, and
• Y is a cyclic oxyalkylene group having 2 to 5 carbon atoms which may be optionally substituted,
• with a hydroxyl group containing (meth)acrylate of the formula:
• CH2═CR—COO—A1—OH (II)
• wherein R is hydrogen or a methyl group, and
• A1 is a divalent linear or branched aliphatic group having 1 to 20 carbon atoms, to give the fluorine-containing polyether monomer of the formula:
• 14
• wherein Rf is a perfluoroalkyl group having 1 to 18 carbon atoms,
• R is hydrogen or a methyl group,
• A1 is a divalent linear or branched aliphatic group having 1 to 20 carbon atoms,
• A2 is a direct bond, or a divalent linear or branched aliphatic group having 1 to 10 carbon atoms which may have an ether linkage,
• X is a trivalent linear or branched aliphatic group having 2 to 5 carbon atoms, and
• n is from2to 100.