US 12,448,334 B2
High temperature sag resistant gypsum panel
Mark K. Hemphill, Hawthorn Woods, IL (US); Qinghua Li, Rolling Meadows, IL (US); and Aaron D. Johnson, Antioch, IL (US)
Assigned to KNAUF GIPS KG, Iphofen (DE)
Filed by KNAUF GIPS KG, Iphofen (DE)
Filed on Jul. 15, 2022, as Appl. No. 17/865,747.
Claims priority of provisional application 63/225,252, filed on Jul. 23, 2021.
Prior Publication US 2023/0045576 A1, Feb. 9, 2023
Int. Cl. C04B 28/14 (2006.01); B28B 19/00 (2006.01); B32B 5/18 (2006.01); C04B 14/46 (2006.01); B32B 17/06 (2006.01); B32B 29/00 (2006.01); C04B 111/00 (2006.01); C04B 111/28 (2006.01); C04B 111/34 (2006.01)
CPC C04B 28/14 (2013.01) [B28B 19/0092 (2013.01); B32B 5/18 (2013.01); C04B 14/46 (2013.01); B32B 17/066 (2013.01); B32B 29/007 (2013.01); B32B 2266/053 (2016.11); B32B 2307/3065 (2013.01); B32B 2307/72 (2013.01); B32B 2315/08 (2013.01); B32B 2315/18 (2013.01); B32B 2607/00 (2013.01); C04B 2111/0062 (2013.01); C04B 2111/28 (2013.01); C04B 2111/34 (2013.01); C04B 2201/20 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A fire-resistant gypsum panel comprising:
a gypsum core layer comprising set gypsum and mineral wool in an amount of between greater than 0.9% and less than or equal to and 3.0% by weight of stucco, wherein the mineral wool includes spun or drawn mineral rock material, and wherein the gypsum panel at a temperature of 1600° F. has a sag reduction of at least 10% compared to a gypsum panel that includes glass fiber in place of the mineral wool but is otherwise likewise configured.
 
9. A set gypsum core for a gypsum panel comprising:
a. set gypsum; and
b. a mineral wool in an amount greater than 0.9% and less than or equal to 3.0% by weight of the stucco, wherein the mineral wool includes spun or drawn mineral rock material,
wherein the gypsum panel at a temperature of 1600° F. has a sag reduction of at least 10% compared to a gypsum panel that includes glass fiber in place of the mineral wool but is otherwise likewise configured.
 
13. A composition for forming a gypsum core for a gypsum panel comprising:
a. water;
b. stucco; and
c. mineral wool in an amount greater than 0.9% and less than or equal to and 3.0% by weight of the stucco, wherein the mineral wool includes spun or drawn mineral rock material;
wherein the gypsum panel at a temperature at 1600° F. has a sag reduction of at least 10% compared to a gypsum panel that includes glass fiber in place of the mineral wool but is otherwise likewise configured.