Scratch-resistant flameproof thermoplastic resin composition
Disclosed herein is a flame retardant thermoplastic resin composition that has superior scratch resistance and mechanical properties, satisfying requirements for the appearance of housing materials resulting from a recent increase in volume of electrical and electronic products, and that contains a phosphorus-based flame-retarding agent, satisfying requirements for fire safety and prevention of environmental problems. The resin composition with scratch resistance comprises a base resin comprising (A) about 30 to about 90 parts by weight of a polycarbonate resin, (B) about 15 to about 50 parts by weight of a polymethylmethacrylate resin and (C) about 5 to about 50 parts by weight of a polyethylene terephthalate-based resin, and (D) about 5 to about 30 parts by weight of a phosphorus-based flame-retarding agent based on 100 parts by weight of the base resin. The composition may further comprise about 1 to about 30 parts by weight of an impact modifier based on 100 parts by weight of the base resin.
1. A flame retardant thermoplastic resin composition with scratch resistance, comprising:
a base resin comprising (A) about 30 to about 90 parts by weight of a polycarbonate resin, (B) about 15 to about 50 parts by weight of a polymethylmethacrylate resin, and (C) about 5 to about 50 parts by weight of a polyethylene terephthalate-based resin; and
(D) about 5 to about 30 parts by weight of a phosphorus-based flame-retarding agent based on 100 parts by weight of the base resin.
2. The resin composition according to claim 1 , wherein the (C) polyethylene terephthalate-based resin comprises an amorphous polyethylene terephthalate resin.
3. The resin composition according to claim 1 , wherein the (D) phosphorus-based flame-retarding agent comprises an aromatic phosphoric ester-based compound represented by the following Formula:
wherein R 1 , R 2 , R 4 , and R 5 are each independently a C 6 -C 20 aryl group or a C 1 -C 20 alkyl-substituted C 6 -C 20 aryl group, R 3 is derived from a dialcohol and the value of n ranges from 0 to 5.
4. The resin composition according to claim 1 , further comprising: about 1 to about 30 parts by weight of an impact modifier based on 100 parts by weight of the base resin.
5. The resin composition according to claim 4 , wherein the impact modifier is obtained by polymerizing at least one rubber monomer selected from the group consisting of diene-based rubbers, acrylate-based rubbers, silicone-based rubbers, and combinations thereof to form a rubber polymer, followed by grafting at least one monomer selected from the group consisting of graft-copolymerizable styrene, alpha-methyl styrene, alkyl-substituted styrene, acrylonitrile, methacrylonitrile, methylmethacrylate, maleic anhydride, alkyl or phenyl nucleus-substituted maleimide, and combinations thereof to the rubber polymer.
6. The resin composition according to claim 5 , wherein the impact modifier is a resin obtained by graft copolymerization of methylmethacrylate and styrene to a butadiene rubber (MBS resin).
7. The resin composition according to claim 1 , further comprising: at least one additive selected from the group consisting of anti-dripping agents, oxidation inhibitors, plasticizers, heat stabilizers, light stabilizers, compatibilizers, pigments, dyes, inorganic fillers, and combinations thereof.
8. A molded article formed of a flame retardant resin composition according to claim 1 .