Fast drying gypsum products

Details Fast drying gypsum products Fast drying gypsum products

2005-06-14

2009-08-11

Marcantoni, Paul (Department: 1793)

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

C106S778000, C106S823000, C524S005000

Reexamination Certificate

active

07572328

ABSTRACT:
A slurry is made including water, at least 50% by weight calcium sulfate hemihydrate, and a specific polycarboxylate dispersant prepared using at least three repeating units. A first repeating unit is a vinyl ether-type repeating unit. A second repeating unit includes a maleic acid-type repeating unit. A third repeating unit includes an acrylic acid-type repeating unit. The polymer dispersant has a molecular weight of from about 20,000 to about 80,000 Daltons. The slurry made from this composition can be made at reduced water levels to speed drying and reduce drying costs.

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