Polybutylene terephthalate resin composition and molded article

1. A polybutylene terephthalate resin composition comprising a 50 to 80 mass parts of a polybutylene terephthalate resin (A) and 20 to 50 mass parts of a polycarbonate resin (B) per 100 mass parts of the total of (A) and (B), and further comprising, per 100 mass parts of the total of (A) and (B), 5 to 20 mass parts of an elastomer (C), 5 to 40 mass parts of a flame retardant (D), 1 to 15 mass parts of an antimony compound (E), and 0.5 to 10 mass pans of a titanium oxide (F) that has been subjected to a surface treatment with an alumina compound and an organosiloxane compound, wherein the elastomer (C) is an acrylic core/shell graft copolymer in which both the core and shell are an acrylate ester.

2. The polybutylene terephthalate resin composition according to claim 1 , wherein the polycarbonate resin (B) has a viscosity-average molecular weight of more than 28,000.

3. The polybutylene terephthalate resin composition according to claim 1 , wherein the elastomer (C) is an acrylic core/shell graft copolymer having a polybutyl acrylate core and a polymethyl methacrylate shell.

4. The polybutylene terephthalate resin composition according to claim 1 , wherein the average particle diameter of the elastomer (C) is 1 μm or less.

5. The polybutylene terephthalate resin composition according to claim 1 , wherein the flame retardant (D) is a brominated polycarbonate flame retardant.

6. The polybutylene terephthalate resin composition according to claim 1 , wherein the antimony compound (E) is incorporated as a masterbatch with the polybutylene terephthalate resin (A).

7. The polybutylene terephthalate resin composition according to claim 1 , further comprising a polyolefinic release agent (G) at 0.01 to 3 mass parts per 100 mass parts of the total of (A) and (B).

8. The polybutylene terephthalate resin composition according to claim 7 , wherein a drop point of the polyolefinic release agent (G) is not more than 100° C.

9. The polybutylene terephthalate resin composition according to claim 1 , further comprising 0.001 to 1 mass parts, per 100 mass parts of the total of (A) and (B), of a metal salt (H) of an organophosphate ester compound represented by any of the following formulas (1) to (4):

wherein in formula (1), R 1 to R 4 are each independently an alkyl group having 1 to 30 carbons or an aryl group having 6 to 30 carbons and M is an alkaline-earth metal or zinc,

in formula (2), R 5 is an alkyl group having 1 to 30 carbons or an aryl group having 6 to 30 carbons and M is an alkaline-earth metal or zinc,

in formula (3), R 6 to R 11 are each independently an alkyl group having 1 to 30 carbons or an aryl group having 6 to 30 carbons and M′ is a metal atom to form a trivalent metal ion, and

in formula (4), R 12 to R 14 are each independently an alkyl group having 1 to 30 carbons or an aryl group having 6 to 30 carbons; M′ is a metal atom to form a trivalent metal ion; and two M′ may be the same or may differ from one another.

10. A molded article formed by molding the polybutylene terephthalate resin composition according to claim 1 .

11. The molded article according to claim 10 , having a morphology in which in a core portion of the molded article, the polybutylene terephthalate resin (A) and the polycarbonate resin (B) form co-continuous phases and the elastomer (C) is present in the polycarbonate resin (B) phase.

12. The molded article according to claim 10 , wherein in a core portion of the molded article, at least 80% of the antimony compound (E) is present in the polybutylene terephthalate resin (A) phase.

13. The molded article according to claim 10 , wherein in a surface layer portion of the molded article, the elastomer (C) phase extends in a resin flow direction and a ratio between a long diameter and a short diameter (long diameter/short diameter) thereof is from 3 to 20.

14. The molded article according to claim 10 , wherein the flame retardant (D) is present in the polycarbonate resin (B) phase.

15. The molded article according to claim 10 , which is at least one selected from the group consisting of a charger connector for an electric automobile, a battery capacitor holder, a housing for a battery capacitor, or a housing for a charging stand for an electric automobile.