Patent ID: 6632509
Filing Date: 2003-10-14
Classification: C08L,E04D,Y10T

Abstract:
A fire retardant roof sheeting membrane for sloped roofs having an incline of at least 1 inch per linear foot, formed from a composition comprising:a base polymer containing at least one ethylene-propylene-diene terpolymer, said base polymer having up to about 2 percent by weight crystallinity; from about 85 to about 175 parts by weight of at least one non-combustible mineral filler per 100 parts of said base polymer; from about 30 to about 50 parts by weight of a processing material, per 100 parts of said base polymer; from about 50 to about 80 parts by weight of at least one fire retardant additive, per 100 parts of said base polymer, wherein said fire retardant additive includes at least a bromine-containing additive and antimony trioxide (Sb2O3); and from about 1.5 to about 10 parts by weight of a cure package per 100 parts of said base polymer, the sheeting membrane composition containing at least 40 percent non-combustible materials, being calenderable for use on a roof, having a limiting oxygen index (LOI) of at least 40 percent oxygen when tested in accordance with ASTM D2863-91, and capable of passing the UL-790 Test for Fire Resistance of Roof Covering Materials for sloped roofs having an incline of at least 1 inch per linear foot.