FLAME RETARDANT AGENT FOR RESINS, FLAME-RETARDANT RESIN COMPOSITION CONTAINING SAME, AND METHOD FOR PRODUCING ORGANOPHOSPHORUS COMPOUND.

摘要

A flame retardant agent for resins, which comprises an organophosphorus compound represented by general formula (I) (wherein R1, R2, R3 and R4 independently represent an alkyl or haloalkyl group having 1 to 8 carbon atoms; Z1 and Z2 independently represent a hydrogen atom, a methyl group or an ethyl group; and n represents 0 to 10), wherein the content of a compound represented by general formula (I) wherein n is 0 is 0.1 to 3.0% by area when the organophosphorus compound is measured by gel permeation chromatography (GPC) and the average condensation degree (N) is 1.5 to 3.5 which is calculated from the contents of compounds respectively represented by general formula (I) wherein n is 0 to 10.