Patent ID: 9221719
Filing Date: 2015-12-29
Classification: C04B

Abstract:
1. A gypsum slurry for making gypsum board, having a composition comprising: calcined gypsum; water, wherein the calcined gypsum reacts with the water; a foam comprising a foaming agent; and a first thickening agent comprising a polyacrylamide in solution having a bulk viscosity of about 12000 cps and a dilute viscosity of about 180 cps, the polyacrylamide having a molecular weight in a range from about 100,000 Daltons to about 1,000,000 Daltons, and wherein the first thickening agent is capable of initiating thickening of the gypsum slurry upon introduction and improving the cohesiveness of the slurry without adversely affecting the setting time of the slurry or the head of the slurry.