Patent ID: 9221234
Filing Date: 2015-12-29
Classification: B32B,C08J,E04B,Y10T

Abstract:
1. A construction board comprising: (a) a polyurethane or polyisocyanurate cellular structure having a density greater than 2.5 pounds per cubic foot and less than 6 pounds per cubic foot, where said cellular structure includes an interconnected network of solid struts or plates that form the edges and faces of cells, and where said cells include an alkane or cycloalkane therein, where the cellular structure includes first and second planar surfaces; and (b) coated glass fiber mats affixed to said first and second planar surfaces, where said interconnected network includes at least 5.0 weight percent flame retardant to enable the board to meet the requirements of UL-790 for flame spread using 45 mil EPDM, said cellular structure having an ISO index that will enable the board to have a compressive strength of at least 89.8 psi, a flexural strength in the machine direction of at least 383 psi, and a flexural strength in the cross-machine direction of at least 218 psi.