Patent ID: 8562873

Claim:
A flame retardant composition which comprises: (A) at least one compound selected from the group consisting of (A-1) a metal oxide represented by the formula M x O y (in the formula, M is at least one element selected from the elements of Groups 5, 8, 10 and 11 of the Periodic Table, and x and y are numerals satisfying 0<x≦5 and 0<y≦5, respectively) and (A-2) a trivalent phosphorus compound; and (B) at least one phosphazene compound containing 80% by weight or more of cyclic trimers, and which is selected from a cyclic phosphazene compound represented by the following formula (2) and a chain phosphazene compound represented by the following formula (3), wherein n is an integer of 3-25, m is an integer of 3-10000, the substituents X are independently an alkyl group of 1-6 carbon atoms, an aryl group of 6-11 carbon atoms, a fluorine atom, an aryloxy group having a substituent represented by the formula (4) (in the formula, R 1 , R 2 R 3 , R 4 and R 5 independently represent a substituent selected from the group consisting of hydrogen atom, fluorine atom, an alkyl group of 1-5 carbon atoms, an alkoxy group of 1-5 carbon atoms, and a phenyl group), a naphthyloxy group, an alkoxy group of 1-6 carbon atoms, or an alkoxy-substituted alkoxy group (a part or all of hydrogen atoms on the substituents may be substituted with fluorine), Y in the formula represents —N=P(O)(X) or —N=P(X) 3 and Z represents —P(X) 4 or -P(O)(X) 2 wherein 90% or more of the total amount of the substituents on the phosphorous atom of said at least one phosphazene compound comprises unsubstituted or substituted phenoxy group; wherein the flame retardant composition contains 0.1-60 parts by weight of the component (A) and 99.9-40 parts by weight of the component (B) in 100 parts by weight of the component (A) and the component (B) in total, and wherein said at least one phosphazene compound has a difference of 40-100° C. between the temperature at which weight reduction is 50% by weight and the temperature at which the weight reduction is 5% by weight when it is heated from room temperature to 600° C. at a heating rate of 10° C/min in an inert gas atmosphere according to TGA.