| abstract |
PROBLEM TO BE SOLVED: To provide an optical disc substrate which is excellent in water absorption resistance, bending elastic modulus, fluidity, heat resistance, and formed of a specific polycarbonate resin having a small photoelastic constant and has small warpage and surface runout. SOLUTION: The aromatic polycarbonate resin is formed substantially from an aromatic polycarbonate resin in which at least 20 mol% of the total aromatic dihydroxy component is 9,9-bis (3-methyl-4-hydroxyphenyl) fluorene. A) The glass transition temperature is 120 ° C. to 180 ° C., and (B) the water absorption after immersion in water at 23 ° C. for 24 hours is 0.1%. 1% by weight or less, and (C) the flexural modulus is 280 An optical disk substrate formed of a resin satisfying 0 MPa to 4000 MPa. |