Moisture-resistant gypsum boards and methods of making them
AssigneeCertainTeed Gypsum, Inc.
InventorsDahlia AMATO, Patrick R. McGINLEY, Cassandra TUBBS, Serge ADJOUA, Remi LESPIAT
Life of this patent
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Abstract
A gypsum-based construction material can include gypsum core including a stucco component, a siloxane component at a content of not greater than about 2.0 wt. % relative to a content of the stucco component, and a calcium hydroxide catalyst at a content of at least about 0.01 wt. % and not greater than about 0.1 wt. % relative to the content of the stucco component. The gypsum-based construction material can have a pH of at least about 7.5 and not greater than about 10.
Claims20
A gypsum-based slurry composition comprising:
- a precursor stucco component,
- a precursor siloxane component at a content of not greater than about 2.0 wt. % relative to a content of the precursor stucco component, and
- a precursor calcium hydroxide catalyst at a content of at least about 0.01 wt. % and not greater than about 0.1 wt. % relative to the content of the precursor stucco component,
- wherein the gypsum-based slurry composition has a pH of at least about 7.5 and not greater than about 10.
A gypsum-based construction material comprising a gypsum core, wherein the gypsum core comprises:
- a stucco component,
- a siloxane component at a content of not greater than about 2.0 wt. % relative to a content of the stucco component, and
- a calcium hydroxide catalyst at a content of at least about 0.01 wt. % and not greater than about 0.1 wt. % relative to the content of the stucco component,
- wherein the gypsum-based construction material has a pH of at least about 7.5 and not greater than about 10.
A method of forming a gypsum-based construction material, wherein the method comprises
- providing a gypsum-based slurry composition comprising:
- a precursor stucco component,
- a precursor siloxane component at a content of not greater than about 2.0 wt. % relative to a content of the precursor stucco component, and
- a precursor calcium hydroxide catalyst at a content of at least about 0.01 wt. % and not greater than about 0.1 wt. % relative to the content of the precursor stucco component,
- wherein the gypsum-based slurry composition has a pH of at least about 7.5 and not greater than about 10,
- depositing the slurry composition to form a gypsum preform of the gypsum-based construction material preform, and
- firing the gypsum preform of the gypsum-based construction material to form a gypsum core.
Dependencies are inferred from the claim text.