Patent ID: 6955851

Claim:
A flame retardant epoxy composition derived from a mixture of hydroxyarylphosphine oxides by way of reacting said mixture of hydroxyarylphosphine oxides with an epoxy resin composition, said mixture of hydroxyarylphosphine oxides comprising: (a) a mono(hydroxyaryl)phosphine oxide of the formula: wherein R 1 is a divalent, substituted or unsubstituted arylene moiety and R 2 is a monovalent, substituted or unsubstituted aryl moiety or is an alkyl moiety or is an aralkyl moiety; and (b) a bis(hydroxyaryl)phosphine oxide of the formula: wherein R 1 , R 2 are defined as above; and (c) a tris(hydroxyaryl)phosphine oxide of the formula: wherein R 1 , is defined as above; and (d) optionally containing minor amounts of a pentavalent phosphine oxide of the formula: wherein R 2 is defined as above.