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|1. (WO2018062325) COPOLYESTER RESIN|
|Applicants:||MITSUBISHI GAS CHEMICAL COMPANY, INC.
A copolyester resin having units (A) represented by general formula (1), diol units (B), and derivative units (C) that form a dicarboxylic acid or an ester thereof, wherein the copolyester resin has 10-95 mol% of units (A) among the total units of the copolyester resin and satisfies (1)-(3) below. (1) The glass transition temperature of the copolyester resin is 90°C or higher. (2) The crystallization calorific value on cooling of the copolyester resin is 5 J/g or lower. (3) The absolute value of the photoelastic coefficient of the copolyester resin is 40 × 10-12 Pa-1 or lower. (In general formula (1), R1 is a hydrogen atom, CH3, or C2H5, R2 and R3 each independently are a hydrogen atom or CH3, and n is 0 or 1.)