| 摘要 |
PURPOSE:To obtain an optical material having low hygroscopicity, low dispersion, a high refractive index and low shrinkage during cast polymerization, by incorporating a radical polymer containing specified bromine-containing cyclopentadiene derivatives as principal monomer components. CONSTITUTION:An optical material containing a radical polymer containing compounds of formulas I and II as principal monomer components. In the formulas, R1 is H or methyl, R2 is H or a 1-3C alkyl, n is 1-2, m is 1-4, R3 is a 1-5C alkylene, or alkylene oxide, n is 1-2, and m is 1-4. The compound of formulas I or II can be easily obtained by brominating a hydroxy compound obtained by reacting dicyclopentadiene or tricyclopentadiene with water or a diol in the presence of an acid catalyst and esterifying the brominated hydroxy compound with (meth)acrylic acid. Examples of the compounds of formulas I and IIinclude compounds of formulas III and IV.
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