[Cl:1][C:2](=[CH2:17])[C:3]([O:5][CH:6]([C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)[C:7]([F:10])([F:9])[F:8])=[O:4].[C:18](#[N:22])[C:19]([CH3:21])=[CH2:20].N(C(C)(C)C#N)=NC(C)(C)C#N>C1C=CC=CC=1>[Cl:1][C:2](=[CH2:17])[C:3]([O:5][CH:6]([C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)[C:7]([F:9])([F:10])[F:8])=[O:4].[C:18](#[N:22])[C:19]([CH3:21])=[CH2:20]1.26 g of 1-phenyl-2,2,2-trifluoroethyl α-chloroacrylate, 0.74 g of methacrylnitrile, 0.52 ml of a benzene solution containing 0.1 wt% of azobisisobutyronitrile and 1.75 ml of benzene were introduced into a flask, and the flask was evacuated by vacuuming in a usual manner. The mixture in the flask was stirred at 70° C. for 20 hours, and then the reaction product was poured into methanol. The polymer was permitted to precipitate, then subjected to filtration and dried to obtain a 1-phenyl-2,2,2-trifluoroethyl α-chloroacrylate/methacrylnitrile copolymer. The copolymerization ratio was found to be 50/50 by molar ratio as a result of the elemental analysis. The weight average molecular weight was found to be 4.0×105 as calculated as polystyrene, as a result of the GPC measurement.
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