PHOSPHORUS FLAME RETARDANT, FLAME-RETARDANT RESIN COMPOSITION CONTAINING SAME, AND MOLDED BODY

摘要

Disclosed is a phosphorus flame retardant composition which is characterized by containing an aromatic diphosphate represented by general formula (I). (In general formula (I), R1 and R2 may be the same or different and each represents a lower alkyl group; R3 and R4 may be the same or different and each represents a hydrogen atom or a lower alkyl group; Y represents a bonding hand, a -CH2- group, a -C(CH3)2- group, an -S- group, an -SO2- group, an -O- group, a -CO- group or an -N=N- group; k represents 0 or 1; and m represents an integer of 0-4.) The phosphorus flame retardant composition is also characterized in that the content of phosphorus compounds, which have a hydroxyphenyl group, are represented by general formula (II) (wherein R1, R2, R3, R4, Y, k and m are as defined in general formula (I)) and are contained as impurities, is not more than 1% by area as determined by gel permeation chromatography (GPC).