Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2009-11-12
2010-10-12
Marcantoni, Paul (Department: 1793)
Stock material or miscellaneous articles
Composite
Of inorganic material
C442S386000, C052S309170, C106S772000, C106S778000
Reexamination Certificate
active
07811685
ABSTRACT:
Polymerization of siloxane is improved using a gypsum-based slurry that includes stucco, Class C fly ash, magnesium oxide and an emulsion of siloxane and water. This slurry is used in a method of making water-resistant gypsum articles that includes making an emulsion of siloxane and water, then combining the slurry with a dry mixture of stucco, magnesium oxide and Class C fly ash. The slurry is then shaped as desired and the stucco is allowed to set and the siloxane polymerizes.The resulting product is useful for making a water-resistant gypsum panel having a core that includes interwoven matrices of calcium sulfate dihydrate crystals and a silicone resin, where the interwoven matrices have dispersed throughout them a catalyst comprising magnesium oxide and components from a Class C fly ash.
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Liu Qingxia
Reed Paul
Wang Xuming
Yu Qiang
Greer Burns & Crain Ltd.
Janci, Esq. David F.
Marcantoni Paul
Petti, Esq. Philip T.
United States Gypsum Company
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