Flame retardant, production method therefor, and flame retardant thermoplastic resin composition comprising the same

Abstract

The aim is to provide a flame retardant for thermoplastic resins that has a high flame-retardant imparting effect, and that produces a thermoplastic resin composition with superior moldability and workability that does not easily bleed out and a molded body with superior resistance to heat-moisture and chemicals; and a flame retardant for thermoplastic resins that has a high flame-retardant imparting effect, and that produces a flame retardant with a heat resistance to working temperatures of 300° C. or higher and a molded body with superior resistance to reflow heat and chemicals. Disclosed is a flame retardant, which is a specific flame retardant for thermoplastic resins comprising the reaction product of a nitrogen-containing compound and a phosphorous-containing compound, that is insoluble in toluene and comprises in the range of 5 to 10 wt % of phosphorus atoms. The aforementioned flame retardant may have a weight average molecular weight (Mw) in the range of 2,000 to 10,000, or may have a ratio of at least 1 wt % of crosslinking components within the flame retardant components.