| 摘要 |
A copolymer of an acrylic acid derivative and an other copolymerizable monomer, the acrylic acid derivative being a compound represented by the formula (1) <IMAGE> (1) wherein Rf and Rf' are respectively perfluoroalkyl group having 3 to 21 carbon atoms, a is an integer of 2 to 10, b is an integer of 1 to 10.
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