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C - Chemistry, Metallurgy

08

F

402/173, 88/38

C08F 218/16 (2006.01) C08F 218/00 (2006.01) G02C 7/02 (2006.01)

Patent

CA 1187243

ABSTRACT OF THE DISCLOSURE A plastic lens of a stepped segment having an excellent surface hardness can be obtained at high molding efficiency from cast polymerization of a 95- 50% by weight diethylene glycol bisallyl carbonate and 5-50% by weight of a monomer selected from methyl, ethyl, cyclohexyl, glycidyl acrylates and diacrylates, and 0.1 to 25% by weight of a second monomer selected from diacrylates and dimethacrylates of diethylene glycol, triethylene glycol and tetraethylene glycol. The % by weight are based on the weight of diethylene glycol bisallyl carbonate and the first monomer.

405636

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