| 摘要 |
<p>Provided is an optical resin material having excellent heat resistance. According to an aspect of the present invention, an optical resin material includes a multiple component system that has a component number (z) of at least 3, said component number being defined under the condition that the original number (x) (x?2) of copolymers is included in the counting of the component number. The combination of components that constitute the multicomponent system is selected so that: at least one of the signs among the signs for the intrinsic orientational birefringence of each homopolymer corresponding to each monomer that constitues each component of the copolymer, and, the sign for the orientational birefringence shared by a low-molecular organic compound in each homopolymer, is a sign opposite to the others; and, among the photoelastic birefringence of each homopolymer, and, the photoelastic birefringence shared by the low-molecular organic compound in each homopolymer, at least one is a sign opposite to the others. The component ratio of the components that constitute the multiple component system is selected so that the orientational birefringence and the photoelastic birefringence, which are expressed by this non-birefringent optical resin, are cancelled out simultaneously using the opposite sign relation concerning the orientational birefringence and the opposite sign relation concerning the photoelastic birefringence. Also, at least one of the monomers that constitute the components of the copolymers is a tert-butyl methacrylate.</p> |
