Patent ID: 8043704

Claim:
A clear, layered thermoplastic material for use in transparent, flame-resistant components, the layered material consisting of: a relatively thick inner polymeric layer having a first and a second side, said inner polymeric material having excellent transparency but relatively poor heat release properties, said relatively thick inner polymeric layer being a polycarbonate material having a melt temperature between about 270 and 300 degrees Celsius; and a first thin, transparent outer polymeric layer in direct and intimate contact with a first side of said transparent inner polymeric layer, and a second thin transparent outer polymeric layer in direct and intimate contact with said second side of said transparent inner polymeric layer, said first and second outer polymeric layers being a film material selected from the group consisting of clear, uncolored polyetherketoneketone and polyetheretherketone, having relatively superior heat release and flame resistance properties, and having good transparency when used in film form, but relatively poor transparency properties when used in thicker sections; wherein the thickness of the first and second outer polymeric film layers does not exceed about 5 mils and wherein the combined thickness of the relatively thick inner polymer layer and the thin, transparent out polymeric film layers is between about 0.03 inches and 0.200 inches.