Flame-retardant aromatic polycarbonate resin composition

1. A flame retardant aromatic polycarbonate resin composition comprising:

100 parts by weight of an aromatic polycarbonate (A),

0.01 to 0.5 part by weight of branched metal oxide particles (B), each independently being a branched metal oxide aggregate or a branched metal oxide agglomerate,

0.0001 to 0.2 part by weight of an alkali metal salt (C) of an organic sulfonic acid, and

0.01 to 0.5 part by weight of a fluoropolyrner (D),

said branched metal oxide particles (B) being dispersed in a mixture of said aromatic polycarbonate (A), said alkali metal salt (C) and said fluoropolymer (D),

wherein at least 70% of said branched metal oxide particles (B) have a diameter within the range of from 10 to 200 nm.

2. The composition according to claim 1 , wherein said branched metal oxide particles (B) are branched particles of at least one metal oxide selected from the group consisting of a silicon oxide, a titanium oxide and an aluminum oxide.

3. The composition according to claim 2 , wherein said branched metal oxide particles (B) are branched silicon oxide particles produced by the dry method.

4. The composition according to any one of claims 1 to 3 , wherein the surfaces of said branched metal oxide particles (B) are modified with a silicon compound.

5. The composition according to claim 1 , which further comprises 5 to 200 parts by weight of an additive (E) selected from the group consisting of a reinforcing agent and a filler.

6. The composition according to claim 5 , wherein said additive (B) is at least one substance selected ftom the group consisting of a glass fiber, a carbon fiber, glass flakes, glass beads, glass balloons, a quartz glass and silica.

7. The composition according to claim 1 , wherein said aromatic polycarbonate (A) is produced by a transesterification process.