Polymer resin composition and molded article thereof

1. A polymer resin composition comprising:

one or more copolymer selected from the group consisting of an unsaturated nitrile-diene-based rubber-aromatic vinyl graft copolymer, an alkyl methacrylate-diene-based rubber-aromatic vinyl graft copolymer, and an alkyl methacrylate-silicone/alkyl acrylate graft copolymer;

one or more compatibilizers selected from the group consisting of an unsaturated nitrile-aromatic vinyl-glycidyl methacrylate-based compatibilizer, an unsaturated nitrile-aromatic vinyl-maleic anhydride acid-based compatibilizer, and a saturated ethylene-alkyl acrylate-glycidyl methacrylate-based compatibilizer;

a hindered phenol-based antioxidant;

a phosphite-based antioxidant according to a chemical formula selected from the group consisting of Chemical Formula 3, Chemical Formula 4, and Chemical Formula 5;

a polyester resin;

a polycarbonate resin; and

a block copolymer including two or more alkylene-based repeating units having 2 to 10 carbon atoms and an aromatic vinyl-based repeating unit,

wherein, in Chemical Formula 3, R 1 and R 2 are each independently selected from the group consisting of a substituted alkyl group having 1 to 40 carbon atoms, an unsubstituted alkyl group having 1 to 40 carbon atoms, a substituted aryl group having 6 to 40 carbon atoms, and an unsubstituted aryl group having 6 to 40 carbon atoms,

wherein, in Chemical Formula 4, n is an integer greater than or equal to 1 and R 1 and R 2 are each independently selected from the group consisting of a substituted alkyl group having 1 to 40 carbon atoms, an unsubstituted alkyl group having 1 to 40 carbon atoms, a substituted aryl group having 6 to 40 carbon atoms, and an unsubstituted aryl group having 6 to 40 carbon atoms, and

wherein, in Chemical Formula 5, R 1 , R 2 , R 3 , and R 4 are each independently selected from the group consisting of a substituted alkyl group having 1 to 40 carbon atoms, an unsubstituted alkyl group having 1 to 40 carbon atoms, a substituted aryl group having 6 to 40 carbon atoms, and an unsubstituted aryl group having 6 to 40 carbon atoms

2. The polymer resin composition of claim 1 , wherein

the polymer resin composition has a tensile strength loss rate represented by the following General Formula 1 is 0.5% to 10%:

Tensile strength loss rate (%)=[(tensile strength before test−tensile strength after test/tensile strength before test]×100,  [General Formula 1]

wherein the tensile strength after test are measured as follows:

a pellet prepared by uniformly extruding the polymer resin composition is injected at an injection temperature of 250° C.; the injected tensile strength specimen is conditioned at 23±2° C. under a condition of relative humidities of 50±5% for 24 hours; and then the tensile strength before test is measured,

and a chemical resistant test fixture is manufactured at a critical deformation of 2.2%; the specimen is fixed by the test fixture; an aromatic/aliphatic chemical blend product or a UV blocker is applied on the specimen for 1 minute; the specimen is left at 23±2° C. for 72 hours; and then the tensile strength after test is measured,

with a proviso that the aromatic/aliphatic chemical blend product includes 10 to 90 wt % of ethanol, and as a detailed component, further includes one or more selected from the group consisting of aliphatic and aromatic alcohols, aliphatic and aromatic esters, aromatic aldehydes, unsaturated hydrocarbons, saturated hydrocarbons, aliphatic amines, aliphatic diamines, and terpene.

3. The polymer resin composition of claim 1 , wherein

the one or more copolymers selected from the group consisting of an unsaturated nitrile-diene-based rubber-aromatic vinyl graft copolymer, an alkyl methacrylate-diene-based rubber-aromatic vinyl graft copolymer, and an alkyl methacrylate-silicone/alkyl acrylate graft copolymer are comprised at 1 wt % to 50 wt %, the polyester resin is comprised at 1 wt % to 50 wt %, the polycarbonate resin is comprised at 20 wt % to 90 wt %, and the block copolymer including two or more alkylene-based repeating units having 2 to 10 carbon atoms and an aromatic vinyl-based repeating unit is comprised at 1 wt % to 20 wt %.

4. The polymer resin composition of claim 1 , wherein

a weight ratio between the one or more copolymers selected from the group consisting of an unsaturated nitrile-diene-based rubber-aromatic vinyl graft copolymer, an alkyl methacrylate-diene-based rubber-aromatic vinyl graft copolymer, and an alkyl methacrylate-silicone/alkyl acrylate graft copolymer, and the block copolymer including two or more alkylene-based repeating units having 2 to 10 carbon atoms and an aromatic vinyl-based repeating unit is 2:1 to 10:1.

5. The polymer resin composition of claim 1 , wherein

the block copolymer including two or more alkylene-based repeating units having 2 to 10 carbon atoms and an aromatic vinyl-based repeating unit includes a block copolymer including an aromatic vinyl-based repeating unit, an alkylene-based repeating unit having 2 to 3 carbon atoms, and an alkylene-based repeating unit having 4 to 10 carbon atoms.

6. The polymer resin composition of claim 5 , wherein

the block copolymer including an aromatic vinyl-based repeating unit, an alkylene-based repeating unit having 2 to 3 carbon atoms, and an alkylene-based repeating unit having 4 to 10 carbon atoms includes 10 wt % to 30 wt % of the aromatic vinyl-based repeating unit.

7. The polymer resin composition of claim 5 , wherein

the block copolymer including an aromatic vinyl-based repeating unit, an alkylene-based repeating unit having 2 to 3 carbon atoms, and an alkylene-based repeating unit having 4 to 10 carbon atoms has a melt flow rate (MFR) of 8 g/10 min to 20 g/10 min under a condition of a temperature of 230° C. and a load of 2.16 kg.

8. The polymer resin composition of claim 5 , wherein

the block copolymer including an aromatic vinyl-based repeating unit, an alkylene-based repeating unit having 2 to 3 carbon atoms, and an alkylene-based repeating unit having 4 to 10 carbon atoms has a density of 0.78 g/cm 3 to 0.98 g/cm 3 .

9. The polymer resin composition of claim 5 , wherein

the block copolymer including an aromatic vinyl-based repeating unit, an alkylene-based repeating unit having 2 to 3 carbon atoms, and an alkylene-based repeating unit having 4 to 10 carbon atoms includes a styrene-ethylene-butylene-styrene block copolymer.

10. The polymer resin composition of claim 1 , wherein

the unsaturated nitrile-diene-based rubber-aromatic vinyl graft copolymer has a structure of a core having an average particle diameter of 0.01 μm to 5 and a glass transition temperature of −20° C. or less; and a shell having a glass transition temperature of 20° C. or more.

11. The polymer resin composition of claim 1 , wherein

the polyester resin includes polytrimethylene terephthalate.

12. The polymer resin composition of claim 11 , wherein

the polytrimethylene terephthalate has a weight average molecular weight of 10,000 to 150,000.

13. The polymer resin composition of claim 1 , wherein

the polycarbonate resin has a glass transition temperature of 50° C. to 200° C., and a weight average molecular weight of 10,000 to 200,000.

14. The polymer resin composition of claim 1 , further comprising

a carbodiimide-based anti-hydrolysis agent.

15. The polymer resin composition of claim 1 , further comprising:

one or more additives selected from the group consisting of a lubricant, a photostabilizer, a photoabsorbent, a transesterification inhibitor, and an anti-hydrolysis agent.

16. A polymer resin molded article comprising the polymer resin composition of claim 1 .

17. The polymer resin molded article of claim 16 , wherein

the polymer resin molded article has one or more uses selected from the group consisting of automotive parts, parts for electrical and electronic equipment, parts for home appliances, parts for office equipment, and parts for household goods.