Siloxane polymerization in wallboard

Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing

Reexamination Certificate

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Details

C106S778000, C106S801000, C106S806000

Reexamination Certificate

active

07815730

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.

REFERENCES:
patent: 4350533 (1982-09-01), Galer et al.
patent: 5683635 (1997-11-01), Sucech et al.
patent: 5817262 (1998-10-01), Englert et al.
patent: 2006/0035112 (2006-02-01), Veeramasuneni et al.

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