Perlite-free, lightweight setting-type joint compound compositions
AssigneeUnited States Gypsum Company
InventorsAlexander J. DONOVAN, Naveen PUNATI
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Abstract
Perlite-free, lightweight setting-type joint compounds which comprise calcium sulfate hemihydrate with a dry density of less than 50 lb/ft3, a foaming agent having a HLB value of at least 10 and preferably comprising an alkylbenzene sulfonic acid having a linear alkyl chain containing 8 to 14 carbons and/or a salt thereof, and a combination of rheology modifiers. Methods for building wallboard assemblies and methods for wall patch and repair projects that include applying the perlite-free, lightweight setting-type joint compounds to a substrate.
Claims20
A composition for perlite-free, lightweight setting-type joint compound, wherein the composition comprises:
- calcium sulfate hemihydrate with a dry density of less than 50 lb/ft3 and water consistency of at least 50 cc of water per 100 grams of calcium sulfate hemihydrate;
- a foaming agent having a hydrophilic-lipophilic balance (HLB) value of at least 10, the foaming agent preferably comprising an alkylbenzene sulfonic acid having a linear alkyl chain containing 8 to 14 carbons and/or a salt thereof;
- optionally, a co-surfactant, wherein the co-surfactant includes a betaine, alkanolamide, alkylpolyglucoside, alkyl ethoxylate, or any combination thereof;
- a rheology modifier including one or more of the following:
- modified cellulose, starch, and/or attapulgite clay;
- and
- wherein the composition does not comprise perlite.
A method for decreasing a wet density of a joint compound which does not comprise perlite, the method comprising:
- mixing calcium sulfate hemihydrate having a dry density of less than 50 lb/pcf and water consistency of at least 50 cc of water per 100 grams of calcium sulfate hemihydrate with one or more anionic surfactants having a hydrophilic-lipophilic balance (HLB) value of at least 10, and producing a joint compound paste weighing about 10 to about 12 lbs/gal when mixed with water.
Dependencies are inferred from the claim text.