Polycarbonate-based resin composition and molded article thereof

1. A polycarbonate-based resin composition comprising:

a polycarbonate resin including an aromatic polycarbonate-based first repeating unit,

a copolycarbonate resin including an aromatic polycarbonate-based first repeating unit, and an aromatic polycarbonate-based second repeating unit having one or more siloxane bonds,

an impact-reinforcing agent including a rubber-modified vinyl-based graft copolymer, and

a flow modifier including a thermoplastic polyester-based polymer or a phosphoric acid ester-based compound;

wherein the first repeating unit each independently includes a repeating unit represented by Chemical Formula 1 below, and;

the second repeating unit includes at least one repeating unit selected from the group consisting of Chemical Formula 3 below:

in Chemical Formula 1,

R 1 to R 4 are each independently hydrogen, C 1-10 alkyl, C 1-10 alkoxy, or halogen, and

Z is C 1-10 alkylene unsubstituted or substituted with phenyl, C 3-15 cycloalkylene unsubstituted or substituted with C 1-10 alkyl, O, S, SO, SO 2 , or CO;

in Chemical Formula 3,

X 2 is each independently C 1-10 alkylene,

Y 1 is each independently hydrogen, C 1-6 alkyl, halogen, hydroxy, C 1-6 alkoxy or C 6-20 aryl,

R 6 is each independently: hydrogen; C 1-15 alkyl unsubstituted or substituted with oxiranyl; oxiranyl-substituted C 1-10 alkoxy; halogen; C 1-10 alkoxy; allyl; C 1-10 haloalkyl; or C 6-20 aryl, and

n2 is an integer of 10 to 200.

2. The polycarbonate-based resin composition of claim 1 , wherein: the polycarbonate resin has a melt index (MI) of 5 g/10 min to 50 g/10 min at a temperature of 300° C. and under a load of 1.2 kg.

3. The polycarbonate-based resin composition of claim 1 , wherein: the second repeating unit further includes at least one repeating unit selected from the group consisting of Chemical Formula 2 below:

in Chemical Formula 2,

X 1 is each independently C 1-10 alkylene,

R 5 is each independently: hydrogen; C 1-15 alkyl unsubstituted or substituted with oxiranyl; oxiranyl-substituted C 1-10 alkoxy; halogen; C 1-10 alkoxy; allyl; C 1-10 haloalkyl; or C 6-20 aryl, and

n1 is an integer of 10 to 200.

4. The polycarbonate-based resin composition of claim 1 , wherein: the repeating unit represented by Chemical Formula 1 is represented by Chemical Formula 1-1:

5. The polycarbonate-based resin composition of claim 3 , wherein: the repeating unit represented by Chemical Formula 2 is represented by Chemical Formula 2-1:

in Chemical Formula 2-1,

R 5 and n1 are each the same as defined in Chemical Formula 2.

6. The polycarbonate-based resin composition of claim 1 , wherein: the repeating unit represented by Chemical Formula 3 is represented by Chemical Formula 3-1:

in Chemical Formula 3-1,

R6 and n2 are each the same as defined in Chemical Formula 3.

7. The polycarbonate-based resin composition of claim 1 , wherein: the copolycarbonate resin includes 90 to 99.999 wt % of the first repeating unit and 0.001 to 10 wt % of the second repeating unit.

8. The polycarbonate-based resin composition of claim 1 , wherein: the polycarbonate resin and the copolycarbonate resin each have a weight average molecular weight of 1,000 to 100,000 g/mol.

9. The polycarbonate-based resin composition of claim 1 , wherein: the rubber-modified vinyl-based graft copolymer is a graft copolymer having a core-shell structure in which a vinyl-based unsaturated monomer is grafted to a core structure to form a shell,

the core structure including at least one rubber selected from the group consisting of diene-based rubber, acrylate-based rubber, and silicone-based rubber.

10. The polycarbonate-based resin composition of claim 1 , wherein: the thermoplastic polyester-based polymer includes at least one polyester-based polymer selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, and polycyclohexane terephthalate modified with ethylene glycol.

11. The polycarbonate-based resin composition of claim 1 , wherein:

the phosphoric acid ester-based compound includes at least one compound selected from the group consisting of triphenyl phosphate, bisphenol A diphenyl phosphate, and resorcinol diphenyl phosphate.

12. The polycarbonate-based resin composition of claim 1 , wherein:

the polycarbonate-based resin composition includes:

40 to 90 wt % of the polycarbonate resin,

5 to 50 wt % of the copolycarbonate resin,

1 to 10 wt % of the impact-reinforcing agent, and

0.5 to 15 wt % of the flow modifier.

13. A molded article comprising the polycarbonate-based resin composition of claim 1 .