Patent ID: 11945751
Assignee: KNAUF GIPS KG
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 12:
13. A method for producing the gypsum panel of claim 1, comprising:
making a siloxane emulsion with siloxane and water;
mixing a siloxane polymerization catalyst comprising (a) 55 wt % to 100 wt % calcium aluminate cement and/or calcium aluminate cement and (b) 0 wt % to 45 wt % and magnesium oxide with calcium sulfate hemihydrate to form a siloxane polymerization catalyst/calcium sulfate hemihydrate mixture, wherein the weight ratio of the siloxane polymerization catalyst to the calcium sulfate hemihydrate is 0.1-5:100;
combining the siloxane emulsion with the siloxane polymerization catalyst/calcium sulfate hemihydrate mixture to prepare an aqueous gypsum slurry comprising at least 50 wt. % calcium sulfate hemihydrate on a water free basis;
shaping the aqueous gypsum slurry and allowing the aqueous gypsum slurry to set to form a set core of the gypsum panel; and
allowing the siloxane polymerization catalyst to polymerize the siloxane partially or fully.