Low dust additives for joint compounds and joint compounds thereof
View Patent ↗The present invention relates generally to wall repair compounds such as joint compounds, spackling compounds, and the like used to repair imperfections in walls or fill joints between adjacent wallboard panels. Particularly, the present invention relates to such a wall repair compound comprising a dust reduction additive that reduces the quantity of airborne dust generated when the hardened compound is sanded and also exhibits improved adhesive properties. The dust reduction additive also imparts adhesion to the wall repair compounds to which it is added, for example to a joint compound. The dust reduction additive comprises micro-crystalline wax or micro-crystalline wax emulsion.
1. A low-dust joint compound composition comprising:
(i) a dust reduction additive comprising micro-crystalline wax; and
(ii) optionally, a first water, wherein the weight of said dust reduction additive is in the range of from about 0.1% to about 10% by weight of said low-dust joint compound composition and the composition further comprises at least one component selected from the group consisting of a silicone, a siliconate, a fluorinated compound, a stearate, or a combination thereof, wherein the silicone, siliconate, fluorinated compound, or stearate is selected form the group consisting of metal siliconate salts, potassium siliconate, poly hydrogen methyl siloxane, polydimethyl siloxane, stearate-based salts, and combinations thereof.
2. The low-dust joint compound composition as recited in claim 1 , wherein the composition further comprises at least one component selected from the group consisting of a filler; a binder; a thickener; a non-leveling agent; a preservative; a rheology modifier; and a surfactant.
3. The low-dust joint compound composition as recited in claim 2 , wherein:
said filler is selected from the group consisting of calcium carbonate (CaCO 3 ), calcium sulfate dihydrate (CaSO 4 2H 2 O), calcium sulfate hemihydrate (CaSO 4 -1/2H 2 O), glass micro bubbles, mica, perlite, talc, limestone, pyrophyllite, silica, diatomaceous earth, cristobalite, a micro-roughened filler, clay, and combinations thereof;
said binder is selected from the group consisting of polyvinyl acetate, polyvinyl alcohol, ethylene vinyl acetate co-polymer, vinylacrylic copolymer, styrene-buta-diene, polyacrylamide, acrylic polymers, latex, natural starch, synthetic starch, casein, and combinations thereof;
said thickener is selected from the group consisting of methyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, hydroxyethyl methyl cellulose, hydroxyethyl hydroxypropyl cellulose, ethylhydroxyethyl cellulose, sodium carboxymethyl cellulose, and combinations thereof; and
said non-leveling agent is selected from the group consisting of attapulgite clay, bentonite, illite, kaolin, sepiolite, clays mixed with starches, and combinations thereof.
4. The low-dust joint compound composition as recited in claim 1 , wherein the weight of said dust reduction additive is in the range of from about 0.1% to about 10% by weight of said low-dust joint compound composition.
5. The low-dust joint compound composition as recited in claim 1 , wherein the peak air-borne dust generation of said low-dust joint compound composition is less than 100 mg/m 3 .