High density polyurethane and polyisocyanurate construction boards and composite boards

摘要

A construction board comprising a cellular body including at least one planar surface, where the cellular body includes a polyurethane or polyisocyanurate cellular structure, where the cellular structure has a density greater than about 2.5 pounds per cubic foot, an ISO index of at least 270, and where the cellular body includes at least 5.0% by weight flame retardant based on the weight of the cellular body.

主权项

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.