Polycarbonate resin composition having good flame retardancy

1. A polycarbonate resin composition that can have excellent flame retardancy comprising:

a base resin comprising (A) about 30 to about 99% by weight of a polycarbonate resin; and (B) about 1 to about 70% by weight of a rubber modified aromatic vinyl based copolymer resin; and

(C) about 0.1 to about 40 parts by weight of a phosphorous compound including (C1) about 20 to about 80% by weight of a phosphate compound represented by Formula 2 and (C2) about 20 to about 80% by weight of a phosphonate compound represented by Formula 3, per 100 parts by weight of a base resin including (A) and (B):

wherein each R 1 is independently C 1 -C 10 alkyl, C 6 -C 20 aryl, C 1 -C 10 alkyl-substituted C 6 -C 20 aryl, or C 7 -C 20 aralkyl;

wherein each R 1 is independently C 1 -C 10 alkyl, C 6 -C 20 aryl, C 1 -C 10 alkyl- substituted C 6 -C 20 aryl, C 1 -C 10 alkoxy, C 1 -C 10 alkoxy-substituted C 6 -C 20 , or C 7 -C 20 aralkyl.

2. The polycarbonate resin composition of claim 1 , wherein each R 1 of Formula 2 is phenyl.

3. The polycarbonate resin composition of claim 1 , wherein each R 1 of Formula 2 is benzyl.

4. The polycarbonate resin composition of claim 1 , wherein each R 1 of Formula 3 is phenyl.

5. The polycarbonate resin composition of claim 1 , wherein each R 1 of Formula 3 is benzyl.

6. The polycarbonate resin composition of claim 1 , wherein each R 1 of Formula 3 is para-methoxyphenyl.

7. The polycarbonate resin composition of claim 1 , wherein each R 1 of Formula 2 is phenyl and each R 1 of Formula 3 is phenyl.

8. The polycarbonate resin composition of claim 1 , wherein each R 1 of Formula 2 is phenyl and each R 1 of Formula 3 is benzyl.

9. The polycarbonate resin composition of claim 1 , wherein each R 1 of Formula 2 is phenyl and each R 1 of Formula 3 is para-methoxyphenyl.

10. The polycarbonate resin composition of claim 1 , wherein the base resin comprises about 40 to about 90% by weight of the polycarbonate resin.

11. The polycarbonate resin composition of claim 10 , wherein the base resin comprises about 50 to about 80% by weight of the polycarbonate resin.

12. The polycarbonate resin composition of claim 11 , wherein the base resin comprises about 60 to about 77% by weight of the polycarbonate resin.

13. The polycarbonate resin composition of claim 1 , wherein the base resin comprises about 1 to about 50% by weight of the rubber modified aromatic vinyl based copolymer resin.

14. The polycarbonate resin composition of claim 3 , wherein the base resin comprises about 5 to about 40% by weight of the rubber modified aromatic vinyl based copolymer resin.

15. The polycarbonate resin composition of claim 1 , wherein the rubber modified aromatic vinyl based copolymer resin (B) comprises:

(B 1 ) about 10 to 100% by weight of a graft copolymer resin prepared by graft-copolymerizing about 5 to about 65% by weight of a rubbery polymer, about 34 to about 94% by weight of an aromatic vinyl monomer, about 1 to about 30% by weight of a monomer copolymerizable with said aromatic vinyl monomer, and about 0 to about 15% by weight of a monomer imparting processability and heat resistance; and

(B 2 ) about 0 to about 90% by weight of a copolymer resin prepared by copolymerizing about 60 to about 90% by weight of an aromatic vinyl monomer, about 10 to about 40% by weight of a monomer copolymerizable with said aromatic vinyl monomer, and about 0 to about 30% by weight of a monomer imparting processability and heat resistance.

16. The polycarbonate resin composition of claim 15 , wherein the rubber modified aromatic vinyl based copolymer resin (B) comprises:

(B 1 ) about 55 to about 90% by weight of the graft copolymer resin; and

(B 2 ) about 10 to about 45% by weight of the copolymer resin.

17. The polycarbonate resin composition of claim 15 , wherein the rubber modified aromatic vinyl based copolymer resin (B) comprises:

(B 1 ) about 15 to about 50% by weight of the graft copolymer resin; and

(B2) about 50 to about 85% by weight of the copolymer resin.

18. The polycarbonate resin composition of claim 15 , wherein:

said aromatic vinyl monomer comprises styrene, α-methylstyrene, β-methylstyrene, p-methylstyrene, para t-buthylstyrene, ethylstyrene, monochlorostyrene, dichlorostyrene, dibromostyrene or a combination thereof;

said monomer copolymerizable with said aromatic vinyl monomer comprises an unsaturated nitrile-containing compound; and

said monomer imparting processability and heat resistance comprises acrylic acid, methacrylic acid, maleic anhydride, N-substituted maleimide or a combination thereof.

19. The polycarbonate resin composition of claim 1 , comprising about 1 to about 30 parts by weight of said phosphorous compound (C).

20. The polycarbonate resin composition of claim 19 , comprising about 2 to about 20 parts by weight of said phosphorous compound (C).

21. The polycarbonate resin composition of claim 1 , wherein said resin composition further comprises one or more additives selected from the group consisting of flame retardants, flame retardant aids, plasticizers, heat stabilizers, anti-dripping agents, antioxidants, light stabilizers, dyes, pigments, inorganic fillers, weather stabilizers, lubricants, coupling agents, antistatic agents, release agents, dispersants, and combinations thereof.

22. A plastic article prepared by the resin composition of claim 1 .

23. The polycarbonate resin composition of claim 1 , comprising about 0.1 to about 8 parts by weight of a phosphorous compound (C).

24. The polycarbonate resin composition of claim 23 , wherein the composition has a flame retardancy of V-0 measured in accordance with UL-94 (⅛″ thickness).

25. The polycarbonate resin composition of claim 23 , wherein the composition does not include a halogenated flame retardant.