CONDENSED TYPE PHOSPHONITE MONOESTER BASED FLAME RETARDANT, PROCESS FOR PREPARATION THEREOF, AND THE FLAME RESISTANT POLYSTYRENE RESIN CONTAINING THE SAME

摘要

A condensed phosphate reactive flame retardant, a method for preparing the condensed phosphate reactive flame retardant, and a flame retardant polyester resin using the flame retardant are provided to improve flame retardancy and to prevent the generation of toxic gas by containing no halogen atom. A condensed phosphate reactive flame retardant is represented by the formula 1, wherein Ar is a phenyl group; and R is -NH-C(=O)-NH- or -NH-CH2-CH2-NH. The condensed phosphate reactive flame retardant is prepared by heating POCl3 in the presence of a metal halogen catalyst at 90-110 deg.C to melt it and adding phenol drop by drop for esterification at 80-130 deg.C; cooling it and adding urea or ethylenediamine to obtain a viscous liquid; adding to it to obtain a crystal; and neutralizing and drying the crystal.