[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[C:9](#[N:12])[CH:10]=[CH2:11].C(OS(C1C=CC=CC=1)(=O)=O)CCCCCCCCCCC.P([O-])([O-])([O-])=O.[Ca+2].P([O-])([O-])([O-])=O.[Ca+2].[Ca+2]>O>[CH2:11]=[CH:10][C:9]#[N:12].[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1A copolymer resin composed of styrene and acrylonitrile was prepared by suspension polymerization as follows. Two hundred parts by weight of water, 0.02 part by weight of dodecylbenzenesulfonate, and 1 part by weight of calcium phosphate were charged in an 8-L polymerization apparatus. After removal of oxygen by proper nitrogen substitution with stirring, the mixture was heated to 85° C. In the mixture was added 75 parts by weight of styrene, 25 parts by weight of acrylonitrile, and 0.8 part by weight of benzoyl peroxide at the same time, and the resulting mixture was stirred for five hours. To the resulting mixture was further added 0.8 part by weight of benzoyl peroxide, and the resulting mixture was stirred for five hours to terminate the reaction. A styrene-acrylonitrile copolymer resin was obtained by dehydration. The refraction index was 1.57.
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