| abstract |
An optical recording medium is disclosed which comprises a substrate containing a polycarbonate resin and a recording layer. The substrate contains copolycarbonate resin having constitutional units represented by the formulae (x) and (y) <IMAGE> (x) <IMAGE> <IMAGE> (y) [wherein Z of the formula (x) is a direct bond, alkylidene, -O-, -S- or -SO2-; X is H, halogen, alkyl, aryl, aralkyl, alkoxy, aryloxy or aralkyloxy; R1 is H, alkyl or aralkyl; m is an integer of 1 to 3; Y of the formula (y) is alkylidene, aryl-substituted alkylene, aryl, -O-, -S-, -CO- or -SO2-; and each of R2, R3, R4 and R5 is H, halogen or alkyl]. |