Patent ID: 7201957

Claim:
A resin-impregnated composite comprising a reinforcing component and a flame retardant epoxy composition comprising: (a) an epoxy resin; (b) a co-crosslinking polyhydroxy mixture including: (i) a mixture of phosphine oxides including hydroxyaryl phosphine oxides of the formulae: (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 and R 2 are defined as above, and (C) a tris(hydroxyareyl)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; and (ii) a phenolic co-crosslinking composition comprising a phenolic component having a hydroxy functionality of two or more, at least partially cured.