Copolycarbonate and polycarbonate composition comprising the same

A copolycarbonate, comprising repeat units of the following Chemical Formula 1 and repeat units of the following Chemical Formula 2:

• Chemical Formula 1
• wherein in Chemical Formula 1:
• R1 to R4 are each independently hydrogen, C1-10 alkyl, C1-10 alkoxy, or halogen;
• and
• Z is C1-10 alkylene that is unsubstituted or substituted with phenyl, C3-15 cycloalkylene that is unsubstituted or substituted with C1-10 alkyl, O, S, SO, SO2, or CO,
• Chemical Formula 2
• wherein in Chemical Formula 2:
• R5, R6, R7, R8 and R9 are each independently hydrogen;
• halogen;
• allyl;
• C1-15 alkyl that is unsubstituted or substituted with one or more selected from the group consisting of halogen, C1-10 alkoxy and C6-20 aryl;
• C1-10 alkoxy that is unsubstituted or substituted with one or more selected from the group consisting of halogen, C1-10 alkoxy and C6-20 aryl;
• or C6-20 aryl that is unsubstituted or substituted with one or more selected from the group consisting of halogen, C1-15 alkyl and C1-10 alkoxy;
• R10 is hydrogen, C1-6 alkyl, halogen, hydroxy, C1-6 alkoxy, or C6-20 aryl;
• each X is independently C1-10 alkylene, —(OCO)—(C1-10 alkylene)-, or —(COO)—(C1-10 alkylene)-;
• each Y is independently hydrogen, C1-6 alkyl, halogen, hydroxy, C1-6 alkoxy, or C6-20 aryl;
• L is C3-10 alkylene;
• Ar1, Ar2 and Ar3 are each independently C6-20 arylene that is unsubstituted or substituted with one or more selected from the group consisting of halogen, C1-15 alkyl and C1-10 alkoxy;
• and
• n and m are each independently an integer from 1 to 999, and 1 is an integer from 0 to 999.