| 摘要 |
PURPOSE:An optical material having a low dispersion and a high refractive index and being low in shrinkage during casting and excellent in moisture absorption resistance, obtained by using a polymer obtained by radical-polymerizing an acrylate monomer containing a specified olefinic group, as a raw material. CONSTITUTION:A monomer mixture having a compound of formula I or II(wherein R1 is H or methyl, R2 is a 1-5C alkylene or alkylene oxide, R3 is H or a 1-3C alkyl, and n is 1 or 2) as the principal monomer component and, if necessary, containing other monomers (e.g., methyl methacrylate) is radical-polymerized. An optical material for spectacles, cameras, etc., is made by using the above obtained polymer as a raw material. Here, the compound of formula I or IIcan be obtained by esterifying a diol derivative of dicyclopentadiene or tricyclopentadiene with (meth)acrylic acid, and include compunds of formulas IIIand IV as example. |
