Patent ID: 9580902
Date: 2017-02-28
CPC Classifications: B32B,D06N,E04B,E04D,Y10T

Claim:
1. A method of producing a fire resistant material comprising the steps of: (a) continuously advancing an indefinite length of a core sheet having a top surface and a bottom surface and a sheet of conductive material selected from the group consisting of aluminum wire mesh, copper wire mesh, steel wire mesh, and nonwoven mats of metal wire, having a first surface and a second surface, (b) coextensively bonding the first surface of the sheet of conductive material to a first predetermined surface of the core sheet, (c) forming a first predetermined bituminous layer by applying a first polymer-modified bituminous material having fire-resistant properties to the second surface of the sheet of conductive material and forming a second predetermined bituminous layer by applying a second polymer-modified bituminous material having non-fire-resistant properties and a higher oil content than the first polymer-modified bituminous material to a second predetermined surface of the core sheet, the first bituminous layer and the second bituminous layer providing a top bituminous layer and a bottom bituminous layer, and (d) embedding granules in at least a portion of the top bituminous layer.