C(OC)(=O)C(C)=C.C(OCC1(CC)COC1)(=O)C(C)=C.C(OCC1CCC2OC2C1)(=O)C=C.[C:34]1(=[O:39])[O:38][CH2:37][CH2:36][O:35]1.[C:40](=[O:47])([O:44][CH2:45][CH3:46])[O:41][CH2:42][CH3:43]>>[C:34]1(=[O:39])[O:38][CH2:37][CH2:36][O:35]1.[C:40](=[O:47])([O:44][CH2:45][CH3:46])[O:41][CH2:42][CH3:43]60.0 g of methyl methacrylate, 16.0 g of 3-ethyl-3-oxetanylmethyl methacrylate, 4.0 g of 3,4-epoxycyclohexylmethyl acrylate, 226.6 g of ethylene carbonate and 0.15 g of N,N′-azobisisobutyronitrile were placed in a three-necked flask equipped with a reflux condenser, and mixed for 30 minutes under stirring while introducing nitrogen gas. Temperature was elevated to 70° C. to conduct radical polymerization for 8 hours. The reaction mixture thus obtained was cooled to 40° C. 226.6 g of diethyl carbonate and 0.15 g of N,N′-azobisisobutyronitrile were added to the reaction mixture, and the resulting mixture was again heated to 70° C. to further conduct radical polymerization for 8 hours. The reaction mixture thus obtained was cooled to 40° C. to obtain an ethylene carbonate/diethyl carbonate mixed solvent solution (concentration: 15% by weight) of the crosslinkable polymer B.
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