[C:1]([O:5][CH:6]1[CH2:11][CH2:10][CH2:9][CH2:8][O:7]1)(=[O:4])[CH:2]=[CH2:3].[C:12]([O:17][CH3:18])(=[O:16])[C:13]([CH3:15])=[CH2:14].N(C(C)(C)C#N)=NC(C)(C)C#N.O>COCC(O)C>[C:1]([O:5][CH:6]1[CH2:11][CH2:10][CH2:9][CH2:8][O:7]1)(=[O:4])[CH:2]=[CH2:3].[C:12]([O:17][CH3:18])(=[O:16])[C:13]([CH3:15])=[CH2:14]In 80 g of propylene glycol monomethyl ether were dissolved 78 g (0.5 mole) of tetrahydropyranyl acrylate and 42 g (0.5 mole) of methyl methacrylate, and 3 g of azobisisobutyronitrile was added thereto, after which they were subjected to polymerization for 10 hours under a nitrogen atmosphere while the reaction temperature was kept at 80° C. After the polymerization, the reaction mixture was dropped into a large amount of water to coagulate a resin. The resin was recovered and dried in a vacuum drier kept at 50° C. overnight to obtain 96 g of a white fine powder of tetrahydropyranyl acrylate/methyl methacrylate copolymer resin.
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