Copolycarbonate and composition containing the same

A copolycarbonate comprising:

• an aromatic polycarbonate-based first repeating unit;
• and
• one or more aromatic polycarbonate-based second repeating units having siloxane bonds,
• wherein the copolycarbonate has a YI (yellow index) of 2 to 6.5 as measured in accordance with ASTM D1925, and an impact strength at low-temperature of 600 to 1000 J/m as measured at −30° C. in accordance with ASTM D256 (⅛ inch, Notched Izod), and
• wherein the second repeating unit comprises a repeating unit represented by Chemical Formula 2 and a repeating unit represented by Chemical Formula 3:
• in Chemical Formula 2,
• each of X1 is independently C1-10 alkylene,
• each of R5 is independently hydrogen;
• C1-15 alkyl unsubstituted or substituted with oxiranyl, oxiranyl-substituted C1-10 alkoxy, or C6-20 aryl;
• halogen;
• C1-10 alkoxy;
• allyl;
• C1-10 haloalkyl;
• or C6-20 aryl, and
• n is an integer of 10 to 200,
• in Chemical Formula 3,
• each of X2 is independently C1-10 alkylene,
• each of Y1 is independently hydrogen, C1-6 alkyl, halogen, hydroxy, C1-6 alkoxy or C6-20 aryl,
• each of R6 is independently hydrogen;
• or C1-15 alkyl unsubstituted or substituted with oxiranyl, oxiranyl-substituted C1-10 alkoxy, or C6-20 aryl;
• halogen;
• C1-10 alkoxy;
• allyl;
• C1-10 haloalkyl;
• or C6-20 aryl, and
• m is an integer of 10 to 200.