Patent ID: 7411013

Claim:
A flame-retardant resin composition, which comprises a base resin (A), an organic phosphorus compound (B), and a flame-retardant auxiliary (C), wherein the organic phosphorus compound (B) comprises at least one member selected from the group consisting of compounds represented by the following formulae (3-1), (4-1) and (4-2): wherein Ar represents an aromatic hydrocarbon ring or a nitrogen-containing aromatic heterocycle; X 1 represents an oxygen atom or a sulfur atom; X 2 represents an oxygen atom or a sulfur atom; Y 3 represents a 5 to 10-membered ring which contains P and X 2 as ring-constituting atoms and may have a substituent, Y 4 and Y 5 are the same or different from each other and each represents a 4 to 10-membered ring which contains P as a ring-constituting atom and may have a substituent; Z 2 represents an alkylene group; R 1 represents an organic group; R 2 represents a hydrogen atom, an alkyl group, or a group represented by the following formulae (3a) or (4a): wherein X 1 , X 2 , Y 3 , Y 4 and Y 5 have the same meanings defined above; “b” denotes an integer of 1 to 6; “c” represents an integer of 0 to 9; and “e” represents 0 or 1.