Flame retardant thermoplastic resin composition and molded article produced from the same

1. A flame retardant thermoplastic resin composition comprising:

(A) about 60 wt % to about 90 wt % of a polycarbonate resin comprising a first polycarbonate having a weight average molecular weight from about 30,000 g/mol to about 50,000 g/mol and a second polycarbonate having a weight average molecular weight from about 5,000 g/mol to about 20,000 g/mol;

(B) about 10 wt % to about 40 wt % of an aromatic vinyl resin having a fogging index (FI) of about 0.8 or less as calculated by Equation 1;

(C) about 1 part by weight to about 20 parts by weight of an impact modifier based on about 100 parts by weight of (A)+(B); and

(D) about 5 parts by weight to about 30 parts by weight of a flame retardant based on about 100 parts by weight of (A)+(B):

Fogging index (FI)= W 1 /W 0×100  [Equation 1]

wherein W1 is a weight of unreacted monomers and oligomers deposited on a lid after placing about 10 g of an aromatic vinyl resin in a soda-lime petri dish having a diameter of about 55 mm, closing and sealing the lid, and reacting the aromatic vinyl resin at 250° C. for 20 minutes therein; and W0 is an initial weight of the aromatic vinyl resin.

2. The flame retardant thermoplastic resin composition according to claim 1 , wherein the polycarbonate resin (A) includes the first polycarbonate in an amount of about 10 wt % to about 90 wt % and the second polycarbonate in an amount of about 10 wt % to about 90 wt %.

3. The flame retardant thermoplastic resin composition according to claim 1 , wherein the (B) aromatic vinyl resin is a styrene-acrylonitrile copolymer.

4. The flame retardant thermoplastic resin composition according to claim 1 , wherein the (B) aromatic vinyl resin has a weight average molecular weight from about 30,000 g/mol to about 200,000 g/mol.

5. The flame retardant thermoplastic resin composition according to claim 1 , wherein the (D) flame retardant is a phosphorus flame retardant.

6. The flame retardant thermoplastic resin composition according to claim 1 , wherein the (D) flame retardant is a mixture of solid and liquid flame retardants.

7. The flame retardant thermoplastic resin composition according to claim 1 , wherein the flame retardant thermoplastic resin composition has a flame retardancy level of V-0 or higher as measured on an about 1.2 mm thick specimen in accordance with the UL-94 vertical test method, an Izod impact strength from about 10 kgf·cm/cm to about 60 kgf·cm/cm as measured on an about ⅛″ thick specimen in accordance with ASTM D256, and a melt flow index (MI) from about 10 g/10 min to about 50 g/10 min as measured at about 220° C. under a load of about 10 kg in accordance with ASTM D1238.

8. The flame retardant thermoplastic resin composition according to claim 1 , wherein the (C) impact modifier is a rubber-modified vinyl graft copolymer.

9. The flame retardant thermoplastic resin composition according to claim 8 , wherein the (C) rubber-modified vinyl graft copolymer has a structure in which an unsaturated monomer is grafted to a rubber core to form a shell, and the unsaturated monomer comprising an aromatic vinyl monomer and at least one monomer copolymerizable with the aromatic vinyl monomer.

10. The flame retardant thermoplastic resin composition according to claim 1 , further comprising (E) polyarylene ether.

11. The flame retardant thermoplastic resin composition according to claim 10 , comprising the (E) polyarylene ether in an amount of about 1 part by weight to about 15 parts by weight, based on about 100 parts by weight of (A)+(B).

12. A molded article produced from the flame retardant thermoplastic resin composition according to claim 1 .