| 摘要 |
PURPOSE:To reduce color aberration, by using a copolymer of a specified monomer and a radically polymerizable monomer. CONSTITUTION:The copolymer to be used is made from the first monomer represented by the shown general formula in which X is H or CH3 and (n) is 0, 1, or 2 and the second radically polymerizable monomer being to have >=1.55 refractive index when it is homopolymerized. As said second monomer, a monomer having a sulfur atom, such as vinylthiophene or vinyl phenyl sulfide, is used. A preferable amt. of the second monomer to be used is 10-70wt%. |
