| 摘要 |
<p>This invention provides an optical resin material, which has simultaneously reduced and substantially eliminated orientation birefringence and photoelastic birefringence, and an optical member comprising the material. The optical material comprises a multiple component system of three or more components containing a copolymerization system of a binary or higher system, and a combination of components constituting the multiple component system and the component ratio thereof are such that, in the optical material, both the orientation birefringence and photoelastic birefringence are simultaneously cancelled and are not more than 5.0 × 10<SUP>-5</SUP> at a degree of orientation of a copolymer main chain of 0.03 and a photoelastic constant of not more than 1.0 × 10<SUP>-12</SUP> (Pa<SUP>-1</SUP>). The multiple component system may contain an additive comprising a low-molecular organic compound, which is anisotropic in polarizability and can be aligned in a polymer. The multiple component system may comprise a ternary or higher copolymerization system. The optical member obtained by molding an optical resin exhibits substantially no birefringence even under the application of external force.</p> |
