Patent ID: 8080627

Claim:
A polycarbonate resin having a viscosity-average molecular weight of 12,000 to 100,000 which is composed mainly by a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2): wherein: R 1 to R 5 each independently represents a group selected from the group consisting of hydrogen, fluorine, chlorine, bromine, iodine, an alkyl group having 1 to 20 carbon atoms which may have substituents, an aryl group having 6 to 12 carbon atoms which may have substituents, an alkoxy group having 1 to 5 carbon atoms which may have substituents and an aralkyl group having 7 to 17 carbon atoms which may have substituents; R 6 represents an alkylene group having 1 to 20 carbon atoms which may have substituents; and Y represents a group selected from the following groups: wherein R 7 to R 20 each independently represents a group selected from the group consisting of hydrogen, fluorine, chlorine, bromine, iodine, an alkyl group having 1 to 20 carbon atoms which may have substituents, an aryl group having 6 to 12 carbon atoms which may have substituents, an alkoxy group having 1 to 5 carbon atoms which may have substituents and an aralkyl group having 7 to 17 carbon atoms which may have substituents; and “a”, “b”, and “c” each represents an integer of not less than 1; wherein: R 21 to R 24 each independently represents a group selected from the group consisting of hydrogen, fluorine, chlorine, bromine, iodine, an alkyl group having 1 to 20 carbon atoms which may have substituents, an aryl group having 6 to 12 carbon atoms which may have substituents, an alkenyl group having 2 to 12 carbon atoms which may have substituents, an alkoxy group having 1 to 5 carbon atoms which may have substituents and an aralkyl group having 7 to 17 carbon atoms which may have substituents; and X represents a group selected from the following groups: wherein: R 25 and R 26 each independently represents a group selected from the group consisting of hydrogen, fluorine, chlorine, bromine, iodine, an alkyl group having 1 to 20 carbon atoms which may have substituents, an alkoxy group having 1 to 5 carbon atoms which may have substituents, an aryl group having 6 to 12 carbon atoms which may have substituents, or R 25 and R 26 may be combined with each other to represent as a whole a group forming a carbon ring of 5 to 20 carbon atoms or a heterocyclic ring of 5 to 12 elements; R 27 and R 28 each independently represents a group selected from the group consisting of hydrogen, fluorine, chlorine, bromine, iodine, an alkyl group having 1 to 9 carbon atoms which may have substituents, an alkoxy group having 1 to 5 carbon atoms which may have substituents, an alkenyl group having 2 to 12 carbon atoms which may have substituents, and an aryl group having 6 to 12 carbon atoms which may have substituents; R 29 represents an alkylene group having 1 to 9 carbon atoms which may have substituents; “d” represents an integer of 0 to 20; and “e” represents an integer of 1 to 500.