Patent ID: 9181132
Filing Date: 2015-11-10
Classification: B32B,C04B,Y10T

Abstract:
1. A gypsum board comprising a cover sheet and a gypsum layer disposed on said cover sheet, said gypsum layer defining a plurality of bubbles dispersed therein and comprising the reaction product of: calcined gypsum; and water; wherein an exothermic reaction occurs between said calcined gypsum and water, with said reaction product having a temperature ranging from an initial temperature (T in the presence of a foaming agent comprising a surfactant for creating a foam to impart a plurality of bubbles in said reaction product; and a coalescing agent comprising an ethylene oxide-propylene oxide (EO/PO) block copolymer and/or a reverse EO/PO block copolymer, with said coalescing agent having a cloud point (T