Patent ID: 7834070

Claim:
A halogen-free and thermal resistant composition, comprising: a mixture comprising a bismaleimide and a maleimide, wherein the bismaleimide and the maleimide have a molar ratio of 99:1 to 50:50; a barbituric acid, wherein the mixture and the barbituric acid have a molar ratio of 93:7 to 80:20; and an epoxy resin, wherein the mixture with the barbituric acid and the epoxy resin have a weight ratio of 5:95 to 50:50; wherein the mixture is polymerized by the barbituric acid in the epoxy resin to form a polymer; wherein the epoxy resin consists of glycidyl ether of novolac, tetraglycedylmethylenedianiline, diglycidyl ortho-phthalate, diglycidyl ether of bisphenol A, or epoxy cresol novloc; the polymer and the epoxy resin interpenetrate to each other to form the halogen-free and thermal resistant composition; and the halogen-free and thermal resistant composition is free of a solvent other than the epoxy resin.