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US 6,740,395 B2Granted
Substrate smoothed by coating with gypsum-containing composition and method of making
AssigneeUnited States Gypsum Company
InventorsJohn D. Halm, Aida L. Carbo, Michael R. Lynn, Richard B. Stevens, Charles J. Miller, Peter M. Attard, Therese A. Fults
Life of this patent
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Abstract
A rough-surfaced substrate, such as a fiberboard, is provided with a smoother surface by applying a coating comprising calcium sulfate hemihydrate which has been prevented from hydrating to gypsum by set preventer, and which sets when brought into contact with a set initiator, e.g. aluminum sulfate, preferably present on the surface of the substrate.
Claims11
A smooth-surfaced, gypsum-coated substrate prepared by the process comprising the steps of:
- (a) applying a coating composition to a rough-surfaced substrate, and
- (b) allowing the coating composition to set wherein said rough-surfaced substrate comprises a set initiator and said coating composition comprises calcium sulfate hemihydrate, and a set preventer capable of preventing the coating composition from setting until the coating composition comes into contact with the set initiator present in the rough-surfaced substrate.
Dependencies are inferred from the claim text.