Abstract: A thermoplastic resin composition for an optical material is provided. The thermoplastic resin composition contains a compounding agent represented by general formula (1). (In general formula (1), R1 to R5 independently represent a hydrogen atom, or an alkyl group having 1 to 20 carbon atoms in total which may have a substituent; R6 to R9 independently represent a hydrogen atom, or an alkyl group having 1 to 20 carbon atoms in total which may have a substituent; and R10 represents a hydrogen atom, or an alkyl group having 1 to carbon atoms in total.

Abstract: The present invention is able to provide a stretched multilayer thermoplastic resin film which comprises layers containing a thermoplastic resin (B) on both surfaces of a layer that contains a thermoplastic resin (A) and elastic particles, and wherein: respective intrinsic birefringences of the thermoplastic resin (A) and the thermoplastic resin (B) are within the range of from ?0.005 to 0.005; the content ratio of the elastic particles in the whole layer containing the thermoplastic resin (A) and the elastic particles is 5-40% by weight; the glass transition temperature of the thermoplastic resin (B) is 110° C. or higher and the saturation water absorption of the thermoplastic resin (B) is less than 1.1 wt %.

Abstract: The method for producing a polyester resin containing a dicarboxylic acid structural unit and a diol structural unit having a cyclic acetal skeleton, wherein the method includes mixing and reacting an ester compound (A) having a cyclic acetal skeleton and an ester compound (B) having no cyclic acetal skeleton, and satisfies the following conditions: (1) the ester compound (A) contains a dicarboxylic acid structural unit, and a diol structural unit having a cyclic acetal skeleton, and has an intrinsic viscosity of 0.1 to 1.5 dl/g as measured at 25° C. in a mixed solution of phenol and 1,1,2,2-tetrachloroethane having a mass ratio of 6:4; and (2) the ester compound (B) comprises a dicarboxylic acid structural unit having no cyclic acetal skeleton and a diol structural unit having no cyclic acetal skeleton, and has an acid value of 1 micro equivalent/g or higher and lower than 150 micro equivalents/g.