Thermoplastic resin composition having improved flowability

1. A thermoplastic resin composition comprising:

(A) about 1 to about 98% by weight of a functional group-containing vinyl copolymer resin reactive with polyester;

(B) about 1 to about 98% by weight of an aromatic vinyl graft copolymer resin;

(C) about 1 to about 98% by weight of a polyester resin; and

(D) about 0.5 to about 30 parts by weight of a bromodiphenyl ethane mixture, based on about 100 parts by weight of a base resin comprising (A), (B) and (C), wherein said bromodiphenyl ethane mixture (D) comprises about 55 to about 85% by weight of hexabromodiphenyl ethane and about 1 to about 25% by weight of a bromodiphenyl ethane compound having an odd number of bromine substituents, based on the total weight of the bromodiphenyl ethane mixture.

2. The thermoplastic resin composition of claim 1 , further comprising about 0.5 to about 30 parts by weight of a bromine-containing flame retardant (E), based on about 100 parts by weight of a base resin comprising (A), (B) and (C).

3. The thermoplastic resin composition of claim 1 , wherein the functional group-containing vinyl copolymer resin reactive with polyester (A) is prepared by polymerizing about 0.01 to about 5 mol % of an unsaturated compound containing a functional group reactive with polyester (a1), and about 95 to about 99.99 mol % of a vinyl compound (a2).

4. The thermoplastic resin composition of claim 1 , wherein said aromatic vinyl graft copolymer resin (B) comprises about 10 to about 100% by weight of a graft copolymer resin (b1) and about 0 to about 90% by weight of a copolymer resin (b2).

5. The thermoplastic resin composition of claim 1 , wherein said polyester resin (C) comprises polyethylene terephthalate, polybutylene terephthalate, or a combination thereof.

6. The thermoplastic resin composition of claim 1 , wherein said bromodiphenyl ethane mixture (D) comprises about 5 to about 85% by weight of hexabromodiphenyl ethane and about 0.01 to about 30% by weight of heptabromodiphenyl ethane, based on the total weight of the bromodiphenyl ethane mixture.

7. The thermoplastic resin composition of claim 1 , further comprising a bromine-containing flame retardant (E) containing bromine in an amount of about 40 to about 87% by weight.

8. The thermoplastic resin composition of claim 1 , further comprising one or more additives comprising a heat stabilizer, dye, pigment, lubricant, releasing agent, dispersant, anti-dripping agent, weather stabilizer, inorganic filler, inorganic fiber or a combination thereof.

9. The thermoplastic resin composition of claim 3 , wherein said functional group-containing unsaturated compound reactive with polyester (a1) is represented by the following chemical formula 1:

wherein:

R 3 , R 4 , and R 5 are each independently hydrogen, saturated or unsaturated C 1 -C 12 alkyl, C 6 -C 14 aryl, or saturated or unsaturated C 1 -C 12 alkyl-substituted C 6 -C 14 aryl;

Y is an ether group (—O—), carboxyl group (—O—[C═O]—, —[O═C]—O—), C 1 -C 12 alkylene, C 6 -C 14 arylene, or saturated or unsaturated C 1 -C 12 alkyl-substituted C 6 -C 14 arylene;

with the proviso that when Y is an ether group (—O—) or carboxyl group (—O—[C═O]—, —[O═C]—O—), R 1 and R 2 are each independently C 1 -C 12 alkylene, C 6 -C 14 arylene or saturated or unsaturated C 1 -C 12 alkyl-substituted C 6 -C 14 arylene; and when Y is C 1 -C 12 alkylene, C 6 -C 14 arylene or saturated or unsaturated C 1 -C 12 alkyl-substituted C 6 -C 14 arylene, Y represents a (R1-Y—R2) structure;

x=0 or 1; and

Z is an epoxy group, carboxyl group, isocyanate group, oxadiazole group, amine group, or hydroxyl group.

10. The thermoplastic resin composition of claim 3 , wherein said functional group-containing unsaturated compound reactive with polyester (a1) comprises epoxy alkyl acrylate, allyl glycidyl ester, aryl glycidyl ester, glycidyl methacrylate, glycidyl acrylate, butadiene monooxide, vinyl glycidyl ether, glycidyl itaconate or a combination thereof.

11. The thermoplastic resin composition of claim 3 , wherein said vinyl compound (a2) comprises about 50 to about 99% by weight of an aromatic vinyl monomer and about 1 to about 50% by weight of an unsaturated nitrile monomer.

12. The thermoplastic resin composition of claim 4 , wherein said graft copolymer resin (b1) is prepared by graft-polymerizing about 5 to about 65% by weight of a rubbery polymer, about 34 to about 94% by weight of an aromatic vinyl monomer, and about 1 to about 30% by weight of an unsaturated nitrile monomer.

13. The thermoplastic resin composition of claim 4 , wherein said graft copolymer resin (b2) is prepared by graft-polymerizing about 70 to about 95% by weight of an aromatic vinyl monomer and about 5 to about 30% by weight of an unsaturated nitrile monomer.

14. The thermoplastic resin composition of claim 7 , wherein said bromine-containing flame retardant (E) comprises tetrabromobisphenol A, decabromodiphenyloxide, decabromodiphenyl ethane, 1,2-bis(tribromophenyl)ethane, brominated epoxy oligomer having a molecular weight of about 600 to about 8,000, octabromotrimethylphenyl indane, bis(2,3-dibromopropyl ether), tris(tribromophenyl)triazine, brominated aliphatic or aromatic hydrocarbon, or a combination thereof.