# US 9,039,831 B2 · Non-aqueous rapid setting drywall compound and method of use > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,831 B2 - Document ID: US9039831B2 - Status: Granted - Kind: B2 - Application number: 13/668,765 - Filed: 2012-11-05 - Published: 2014-05-08 - Granted: 2015-05-26 - Earliest claimed: 2012-11-05 - Applicants: Walter Trudeau - Inventors: Walter Trudeau - Web page: https://patentgrep.com/patent/US9039831B2 ## CPC - C04B 28/14: containing calcium sulfate cements {(gypsum-paper plates E04C)} - C04B 26/06: Acrylates - E04G 23/02: Repairing, e.g. filling cracks; Restoring; Altering; Enlarging {(compositions of filling material C04B; strengthening, widening, repairing of bridges E01D22/00; drying damp layers by temporary mechanical ventilation E04B1/7092)} - C04B 2103/10: Accelerators; Activators - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - E04G: SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS ## Abstract A non-aqueous drywall compound being the combination of a first component mixture of acetone, a non-aqueous liquid adhesive containing ethyl cyanoacrylate, and a powder containing calcium sulfate hemihydrate (plaster of Paris), the mixture being a pliable putty capable of adhering to gypsum wallboard or similar work surfaces. The second component of the drywall compound is an accelerator or activator containing acetone and toluene. The first component is applied to a defect in a work surface using a spreading tool and the second component is then applied to the exposed surface of the first component, such as by spraying or brushing, whereupon the drywall compound cures, hardens or sets within less than ten minutes to a state capable of being sanded into a smooth, hard surface and painted. ## Claims ### Claim 1 A non-aqueous drywall compound comprising the combination of a first component and a second component; said first component comprising the non-aqueous mixture of (a) acetone, (b) a liquid primarily comprising ethyl cyanoacrylate, and (c) a powder primarily comprising calcium sulfate hemihydrate, the mixture being a pliable putty capable of adhering to a surface; said second component comprising a non-aqueous accelerator primarily comprising acetone and further comprising toluene; whereby the combination of said first component and said second cures in less than ten minutes. ### Claim 2 (depends on 1) The drywall compound of claim 1, wherein said liquid primarily comprising ethyl cyanoacrylate further comprises poly-methyl-methacrylate and hydroquinone; and wherein said powder primarily comprising calcium sulfate hemihydrate further comprises one or more of the group of compositions consisting of limestone, dolomite, expanded perlite, mica, a vinyl alcohol polymer, attapulgite and crystalline silica. ### Claim 3 (depends on 2) The drywall compound of claim 2, wherein said liquid primarily comprising ethyl cyanoacrylate and further comprising poly-methyl-methacrylate and hydroquinone comprises approximately 90-95 wt % ethyl cyanoacrylate, approximately 5-10 wt % poly-methyl-methacrylate and approximately 0.1-0.5 wt % hydroquinone; wherein said powder primarily comprising calcium sulfate hemihydrate further comprises one or more of the group of compositions consisting of limestone, dolomite, expanded perlite, mica, a vinyl alcohol polymer, attapulgite and crystalline silica comprises approximately 60-70 wt % calcium sulfate hemihydrate, less than 10 wt % limestone or dolomite, less than 10 wt % expanded perlite, less than 10 wt % mica, less than 5 wt % of a vinyl alcohol polymer, less than 5 wt % attapulgite and less than 5 wt % crystalline; and wherein said second component of said non-aqueous drywall compound comprises approximately 90-95 wt % acetone and approximately 5-50 wt % modified toluene polymer. ### Claim 4 (depends on 1) The drywall compound of claim 1, wherein said first component is present in said combination at greater than 99 wt % of said drywall compound and said second component is present in said combination at less than 1.0 wt % of the said drywall compound. ### Claim 5 (depends on 1) The drywall compound of claim 1, wherein said acetone is present at approximately 32-45 wt % of said first component, said liquid primarily comprising ethyl cyanoacrylate is present at approximately 3-10 wt % of said first component, and said powder primarily comprising calcium sulfate hemihydrate is present at approximately 45-65 wt % of said first component. ### Claim 6 (depends on 1) The drywall compound of claim 1, wherein said acetone is present at approximately 32-41 wt % of said first component, said liquid primarily comprising ethyl cyanoacrylate is present at approximately 3-4 wt % of said first component, and said powder primarily comprising calcium sulfate hemihydrate is present at approximately 55-65 wt % of said first component. ### Claim 7 (depends on 1) The drywall compound of claim 1, wherein said acetone is present at approximately 32 wt % of said first component, said liquid primarily comprising ethyl cyanoacrylate is present at approximately 3 wt % of said first component, and said powder primarily comprising calcium sulfate hemihydrate is present at approximately 65 wt % of said first component. ### Claim 8 (depends on 3) The drywall compound of claim 3, wherein said first component is present in said combination at greater than 99 wt % of said drywall compound and said second component is present in said combination at less than 1.0 wt % of the said drywall compound. ### Claim 9 (depends on 3) The drywall compound of claim 3, wherein said acetone is present at approximately 32-45 wt % of said first component, said liquid primarily comprising ethyl cyanoacrylate is present at approximately 3-10 wt % of said first component, and said powder primarily comprising calcium sulfate hemihydrate is present at approximately 45-65 wt % of said first component. ### Claim 10 (depends on 3) The drywall compound of claim 3, wherein said acetone is present at approximately 32-41 wt % of said first component, said liquid primarily comprising ethyl cyanoacrylate is present at approximately 3-4 wt % of said first component, and said powder primarily comprising calcium sulfate hemihydrate is present at approximately 55-65 wt % of said first component. ### Claim 11 (depends on 3) The drywall compound of claim 3, wherein said acetone is present at approximately 32 wt % of said first component, said liquid primarily comprising ethyl cyanoacrylate is present at approximately 3 wt % of said first component, and said powder primarily comprising calcium sulfate hemihydrate is present at approximately 65 wt % of said first component. ### Claim 12 (depends on 4) The drywall compound of claim 4, wherein said first component is present in said combination at greater than 99 wt % of said drywall compound and said second component is present in said combination at less than 1.0 wt % of the said drywall compound. ### Claim 13 (depends on 4) The drywall compound of claim 4, wherein said acetone is present at approximately 32-45 wt % of said first component, said liquid primarily comprising ethyl cyanoacrylate is present at approximately 3-10 wt % of said first component, and said powder primarily comprising calcium sulfate hemihydrate is present at approximately 45-65 wt % of said first component. ### Claim 14 (depends on 4) The drywall compound of claim 4, wherein said acetone is present at approximately 32-41 wt % of said first component, said liquid primarily comprising ethyl cyanoacrylate is present at approximately 3-4 wt % of said first component, and said powder primarily comprising calcium sulfate hemihydrate is present at approximately 55-65 wt % of said first component. ### Claim 15 (depends on 4) The drywall compound of claim 4, wherein said acetone is present at approximately 32 wt % of said first component, said liquid primarily comprising ethyl cyanoacrylate is present at approximately 3 wt % of said first component, and said powder primarily comprising calcium sulfate hemihydrate is present at approximately 65 wt % of said first component. ### Claim 16 A method of repairing a defect in a work surface comprising the steps of: (a) providing a non-aqueous drywall compound comprising the combination of a first component and a second component; said first component comprising the non-aqueous mixture of acetone, a liquid primarily comprising ethyl cyanoacrylate, and a powder primarily comprising calcium sulfate hemihydrate, the mixture being a pliable putty capable of adhering to a surface; said second component comprising a non-aqueous accelerator primarily comprising acetone and further comprising toluene; whereby the combination of said first component and said second cures in less than ten minutes; (b) mixing said acetone, said liquid primarily comprising ethyl cyanoacrylate, and said powder primarily comprising calcium sulfate hemihydrate whereby said first component is a spreadable putty; (c) applying said first component to said defect such that an exposed surface is formed on said first component; (d) applying said second component to said exposed surface of said first component to form said drywall compound; (e) allowing said drywall compound to cure; and (f) sanding said drywall compound. ### Claim 17 (depends on 16) The method of claim 16, wherein said step (f) is performed within ten minutes of step (d). ### Claim 18 (depends on 16) The method of claim 16, further comprising the steps of: (g) applying said first component to said drywall compound such that an exposed surface is formed on said first component; (h) applying said second component to said exposed surface of said first component applied to said drywall compound in step (g) to form an additional layer of said drywall compound; (i) allowing said additional layer of said drywall compound to cure; and (j) sanding said additional layer of said drywall compound; and (k) repeating steps (g) through (j) as needed to completely fill or cover said defect. ### Claim 19 (depends on 18) The method of claim 18, wherein step (f) is performed within ten minutes of step (d) and step (j) is performed within ten minutes of step (h). ### Claim 20 A non-aqueous drywall compound comprising the combination of a first component and a second component; said first component comprising the mixture of (a) acetone, (b) a liquid primarily comprising ethyl cyanoacrylate, and (c) a powder primarily comprising calcium sulfate hemihydrate, said mixture not including water, the mixture being a pliable putty capable of adhering to a surface; said second component comprising a non-aqueous accelerator primarily comprising acetone and further comprising toluene; whereby the combination of said first component and said second cures in less than ten minutes.