Patent ID: 7365113

Claim:
A flame retardant comprising at least a phosphate ester compound having the formula: wherein each of Z 1 , Z 2 , and Z 3 is independently —OH or a phosphate ester group and at least one of Z 1 , Z 2 , and Z 3 is a phosphate ester group; and each of R 1 , R 2 , R 3 , and R 4 is independently H, alkyl, alkenyl, alkynyl, aryl, cycloalkyl, furyl, thienyl, pyrrolyl, indolyl, indolizinyl, isoindolyl, pyrazolyl, imidazolyl, thiazolyl, thiadiazolyl, benzothiazolyl, 1, 2, 4-triazolyl, 1, 2,3-triazolyl, indazolyl, benzotriazolyl, benzimidazolyl, indazolyl carbazolyl, carbolinyl, benzofuranyl, isobenzofuranyl benzothiophenyl, dibenzofuranyl, dibenzothiophenyl, isothiazolyl, isoxazolyl, pyridyl, purinyl, pyridazinyl, pyrimidinyl, pyrazinyl, triazinyl, tetrazinyl, petazinyl, quinolinyl, isoquinolinyl, perimidinyl, cinnolinyl, phthalazinyl, quinazolinyl, quinoxalinyl, naphthyridinyl, acridinyl, phenanthridinyl, phenanthrolinyl, anthyridinyl, purinyl, pteridinyl, alloxazinyl, phenazinyl, phenothiazinyl, phenoxazinyl, phenoxathiinyl, dibenzo(1,4)dioxinyl, thianthrenyl, or an alkyl group where at least one of the methylene group is replaced by a heteroatom or a hetero-group.