| 摘要 |
PROBLEM TO BE SOLVED: To provide a transparent optical resin material having both very-small orientation birefringence and photoelastic birefringence, having very few foreign matter defects, and having excellent heat resistance and mechanical strength; and to provide an optical film.SOLUTION: An optical resin material includes a graft copolymer (C) obtained by polymerizing a vinyl monomer mixture (B) in the presence of a vinyl polymer (A) having at least one-layer crosslinked structure, and the orientation birefringence of the graft copolymer (C) is -15×10to 15×10, and the photoelastic constant thereof is -10×10to 10×10Pa. |
