Patent ID: 7202311

Claim:
A polyhydroxy mixture for co-crosslinking an epoxy resin and imparting flame resistance comprising, (a) a mixture of phosphine oxides including hydroxyaryl phosphine oxides of the formulae: (i) 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 (ii) a bis(hydroxyaryl)phosphine oxide of the formula: wherein R 1 and R 2 are defined as above; and (iii) a tris(hydroxyaryl)phosphine oxide of the formula: wherein R 1 is defined as above; and (iv) optionally containing minor amounts of a pentavalent phosphine oxide of the formula: wherein R 2 is defined as above; and (b) a phenolic co-crosslinking composition comprising a phenolic component having a hydroxy functionality of two or more.