Patent ID: 7439289

Claim:
A flame retardant having the formula: wherein each of Z 1 and Z 2 is independently a phosphate ester group; each of X 1 , X 2 , X 3 , X 4 and X 5 is independently hydrogen, halogen, nitro, cyano, acyl, alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, or heterocycloalkyl, or X 1 and X 2 , X 2 and X 3 , X 3 and X 4 , or X 4 and X 5 form a benzo group; each of alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl or benzo is substituted or unsubstituted; and the phosphate ester group has formula (II): wherein each of R 1 and R 2 is independently alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, or heterocycloalkyl; and each of alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, and heterocycloalkyl, is substituted or unsubstituted.