Patent ID: 8822614
Filing Date: 2014-09-02
Classification: C08F,C08J,G02B

Abstract:
1. An acrylic thermoplastic resin comprising: 50 to 95% by mass of a repeating unit (X) derived from a methacrylate monomer represented by the following Chemical Formula (1); 0.1 to 20% by mass of a repeating unit (Y1) derived from an N-substituted maleimide monomer (a) represented by the following Chemical Formula (2); and 0.1 to 49.9% by mass of a repeating unit (Y2) derived from an N-substituted maleimide monomer (b) represented by the following Chemical Formula (3) regarding the total amount of the repeating unit (X), the repeating unit (Y1), and the repeating unit (Y2) as 100% by mass: where R where R where R wherein: the absolute value of a photoelastic coefficient (C) is not greater than 3.0×10 the halogen atom content is less than 0.47% by mass with reference to the mass of the acrylic thermoplastic resin and the acrylic thermoplastic resin satisfies the following optical property (i): (i) the absolute value of retardation (Re) in an in-plane direction is not greater than 30 nm, where the retardation is a value obtained by converting a value measured from a film of the acrylic thermoplastic resin into a value in terms of a 100 μm thickness.