PROCESSES FOR THE PREPARATION OF OLIGOMERIC PHOSPHATES ESTER COMPOSITIONS

摘要

Flame retardant oligomeric phosphate ester compositions having the structural formula: are prepared, wherein R is C1-C10 alkyl or haloalkyl, R<1> and R<2> can be the same or different and are hydrogen, C1-C10 alkyl or haloalkyl and n is an integer from zero to about 10. The method of preparing the compositions comprises reacting P2O5 with a trialkyl or tris(haloalkyl) phosphate in the presence of about 0.01% to about 5% of a phosphite at a temperature from about 0 DEG -200 DEG C. A polyphosphate ester having P-O-P bonds is formed which is then reacted with an epoxide to yield the oligomeric phosphate ester flame retardant compositions. Alternatively, a method of preparing similar compositions comprises reacting P2O5 with a trialkyl or tris(haloalkyl) phosphite at a temperature from about 0 DEG C. to about 200 DEG C. A mixed polyphosphate-polyphosphite ester having P-O-P bonds is formed which is then oxidised to yield a polyphosphate having P-O-P bonds; which is then reacted with an epoxide to yield the oligomeric phosphate ester flame retardant compositions.