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

Claim 18:
19. A gypsum panel having a core consisting of:
interwoven matrices of calcium sulfate dihydrate crystals and a silicone resin, wherein the silicon resin is formed from polymerization of siloxane, wherein the interwoven matrices have dispersed throughout them a siloxane polymerization catalyst consisting of:
(a) 55 wt % to 100 wt % calcium aluminate cement and/or calcium sulfoaluminate cement,
wherein the calcium aluminate cement is 30 to 80 wt % Al2O3, wherein at least one phase of calcium aluminate in the calcium aluminate cement is monocalcium aluminate, dodecacalcium hepta-aluminate and/or calcium dialuminate, wherein at least a portion of the calcium aluminate cement is at least one calcium silicate compound, wherein at least a portion of the calcium aluminate cement is at least one calcium ferrite compound,
wherein the calcium sulfoaluminate cement is 30 to 80 wt % anhydrous calcium sulfoaluminate having formula 4CaO•3Al2O3•CaSO4, wherein at least 30 to 75 wt % of the calcium sulfoaluminate cement is Ca4(AlO2)6SO4, wherein at least a portion of the calcium sulfoaluminate cement is at least one of dicalcium silicate (2CaO•SiO2), gypsum (CaSO4•2H2O), and aluminoferrite (4CaO•Al2O3•Fe2O3); and
(b) 0 wt % to 45 wt % and magnesium oxide;
wherein the weight ratio of the siloxane polymerization catalyst to the calcium sulfate dihydrate is 0.5-5:100, wherein the gypsum panel comprises at least 50 wt. % calcium sulfate dihydrate;
and at least one additive selected from the group consisting of: biocide, set retarder, set accelerator, starch, dispersant, foaming agent, filler, wax emulsion, thickener, fire retardant, latex binder, sugar, phosphates, phosphonates, borates and colorants.