| 摘要 |
PROBLEM TO BE SOLVED: To obtain an optical transparent material having excellent weather resistance and low water absorption properties without impairing excellent mechanical characteristics and optical characteristics of a methyl methacrylate-styrene copolymer. SOLUTION: The optical transparent material comprises an alkyl methacrylate-aromatic vinyl alternating copolymer that has the molar ratio of an alkyl methacrylate-based monomer unit such as MMA etc., and an aromatic vinyl-based monomer unit such as styrene etc., of 45:55-55:45, a number-average molecular weight of 5,000-3,000,000 and the chain of the alkyl methacrylate-aromatic vinyl of≥90%. COPYRIGHT: (C)2009,JPO&INPIT
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