Joint compounds and plasters with a complexometric dye and methods
AssigneeUnited States Gypsum Company
InventorsAlexander Donovan, Joseph Schlude
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Abstract
A building construction product comprising an ionochromic dye, wherein the building construction product has a first color when the product comprises water, wherein the first color is dependent on the presence of metal ions in solution in the product; and wherein the product has a second color when the product has solidified. Methods of monitoring setting and drying reactions of building construction products, including setting-type and drying-type joint compounds and plasters.
Claims7
A building construction product comprising calconcarboxylic acid and/or a salt of calconcarboxylic acid, wherein the product is a gypsum slurry, plaster or a setting-type joint compound comprising a non-calcium bearing phosphate, and wherein the building construction product sets by a setting reaction in which calcium sulfate hemihydrate hydrates to gypsum, and
- wherein the calconcarboxylic acid and/or the salt of calconcarboxylic acid is present in the building construction product in an amount sufficient for producing a visibly detectable color change in the building construction product which has set and hardened, and wherein the visibly detectable color change is indicative of the building construction product being set and hardened.
Dependencies are inferred from the claim text.