Patent ID: 6353080
Filing Date: 2002-03-05
Classification: C08G

Abstract:
A flame retardant epoxy resin composition containing no more than 10 percent by weight of halogen, comprisinga) an epoxy resin, b) a phosphonic acid ester in an amount such as to provide from 0.2 to 5 weight percent phosphorus in the composition, c) a nitrogen-containing cross-linking agent having an amine functionality of at least 2, in an amount of from 10 to 80 percent of the stoichiometric amount needed to cure the epoxy resin such that the composition contains a stoichiometric excess of epoxy resin over the nitrogen-containing cross-linking agent, d) from 0.1 to 3 weight percent of a catalyst capable of promoting the reaction of the phosphonic acid ester with the epoxy resin and promoting the curing of the epoxy resin with the cross-linker and, optionally e) a Lewis acid in an amount of up to 2 moles per mole of catalyst.