Polyester-polycarbonate copolymer and method for producing same

A polycarbonate block copolymer consisting of, as repeating units, (A) a polyester block having a structure represented by the following chemical formula 1;

• and (B) a polycarbonate block derived from a polycarbonate oligomer prepared from a dihydric phenol compound and phosgene:
• wherein, in the above chemical formula 1,
• R1 independently represents hydrogen atom;
• X independently represents oxygen or NR2, where R2 independently represents hydrogen atom or aryl;
• R3 independently represents aryl;
• and
• m is independently an integer of 5 to 11,
• wherein the dihydric phenol compound is a compound of the following chemical formula 3:
• wherein, in the above chemical formula 3, L is a linear, branched or cyclic alkylene group having 1 to 10 carbons;
• each of R4 and R5 independently represents halogen atom, or linear, branched or cyclic alkyl group;
• and m and n independently represent an integer of 0 to 4;
• wherein the amount of the polyester block (A) having a structure represented by chemical formula 1 is 0.5 to 50 mol %, based on the total moles of the monomer compounds constituting the copolymer as 100 mol %,
• wherein the polycarbonate block copolymer has a viscosity average molecular weight (Mv) of 21,000 to 71,000, wherein the polycarbonate block copolymer has an impact strength of 71-80 Kgf cm/cm2, and wherein the polycarbonate block copolymer has a glass transition temperature of above 185° C. and up to 229° C. and
• wherein the polycarbonate block copolymer has a glass transition temperature of above 152° C. and up to 211° C.