| 摘要 |
[Problem] To provide an ionomer resin composition which has excellent transparency, heat resistance, flexibility and dimensional stability, and which is molded into a film that has small orientational birefringence and small photoelastic birefringence. To also provide: an optical film which contains the ionomer resin composition; and a polarizing plate and a liquid crystal display device, each of which is provided with the optical film. [Solution] An ionomer resin composition according to the present invention is obtained by reacting an acrylic thermoplastic resin (X) that contains a chain alkyl (meth)acrylate unit (a), an N-substituted maleimide unit (b) and an unsaturated acid and/or unsaturated acid anhydride unit (c) with a metal compound (Y). The acrylic thermoplastic resin (X) contains the chain alkyl (meth)acrylate unit (a), the N-substituted maleimide unit (b) and the unsaturated acid and/or unsaturated acid anhydride unit (c) in an amount of 80% by mass or more in total. Respective contents of the components (a), (b) and (c) relative to 100 parts by mass of the acrylic thermoplastic resin (X) excluding the unsaturated acid and/or unsaturated acid anhydride unit (c) are 70-85 parts by mass, 1-30 parts by mass and 0.1-5 parts by mass, respectively. |
