Paint remover composition and method of making

Abstract

A composition for paint removal and methods of making and of using the composition are provided. The paint remover composition comprises a component selected from the group consisting of THF, toluene, acetone, DMSO, dioxalane, 1,2 trans dichloroethylene, and a combination thereof.

Claims

1. A composition comprising: tetrahydrofuran (THF), acetone, ammonia and a component selected from the group consisting of dye, paraffin wax, antioxidant, surfactant, thickener, fumed silica, corrosion inhibitor, peroxide inhibitor, and a combination thereof, wherein the component is present in a range of 0.01 weight % to 12.5 weight % based on the weight of the composition; and wherein the THF is present in a range of 4 weight % to 90 weight % based on the weight of the composition and the acetone is present in a range of 4 weight % to 90 weight % based on the weight of the composition.

2. The composition according to claim 1, wherein the composition further comprises toluene, dimethyl sulfoxide (DMSO), 1,2 trans dichloroethylene, or a combination thereof.

3. The composition according to claim 1, wherein the THF is present in a range of 4 weight % to 75 weight % and acetone is present in a range of 4 weight % to 75 weight %.

4. The composition according to claim 3, wherein the THF is present in a range of 4 weight % to 50 weight % and acetone is present in a range of 4 weight % to 50 weight %.

5. The composition according to claim 1, wherein the composition is in a form of a liquid or an aerosol.

6. A method of using the composition according to claim 1, the method comprising applying the composition to a paint for paint removal.

7. The composition according to claim 3, wherein the THF is present in a range of 29.5 weight % to 49.5%, and the acetone is present in a range of 40 weight percent to 46.95%.

8. The composition according to claim 2, wherein the composition further comprises DMSO, and wherein the DMSO is present at a range of 4 weight % to 90 weight %.

9. The composition according to claim 8, wherein the DMSO is present at a range of 20 weight % to 75 weight %.

10. The composition according to claim 8, wherein the DMSO is present at a range of 4 weight % to 45 weight %.

11. The composition according to claim 8, wherein the DMSO is present at 24.75 weight %.

Description

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(1) The following description of the embodiments of the present invention is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. The present invention has broad potential application and utility. The following description is provided herein solely by way of example for purposes of providing an enabling disclosure of the invention, but does not limit the scope or substance of the invention.

(2) In an embodiment of the invention, a paint remover composition comprising tetrahydrofuran (THF) is provided. Preferably, THF and at least one other solvent are used in combination.

(3) In an embodiment of the invention, THF and acetone are used in combination in the composition for paint removal. It has surprisingly been found that there is an unexpected synergy between THF and acetone in removing dried paint from a painted surface.

(4) In an embodiment of the invention, THF and acetone are preferably used in combination in a range of 4 weight % to 90 weight % THF and 4 weight % to 90 weight % acetone. THF and acetone can be used in a combination in a range of 4 weight % to 75 weight % of THF and 4 weight % to 75 weight % of acetone. THF and acetone can be used in a combination in a range of 4 weight % to 50 weight % of THF and 4 weight % to 50 weight % of acetone.

(5) Other components may be present in the formulation for paint removal. Non-limiting examples of other such components include, but are not limited to, dye, paraffin wax, antioxidant, surfactant, thickener, fumed silica, corrosion inhibitor, ammonia, peroxide inhibitor (including but not limited to butylated hydroxytoluene), or a combination thereof.

(6) Other components, alone or in combination, may be added in a range of 0 weight % to 25 weight %, more preferably 0.01 weight % to 12.5 weight %.

(7) In an embodiment of the invention, THF and dimethyl sulfoxide (DMSO) are used in combination in the composition for paint removal. It has surprisingly been found that there is an unexpected synergy between THF and DMSO solvents in removing dried paint from a painted surface. THF and DMSO may be used along with acetone. The paint remover composition of the present invention is suitable for chemically stripping paint of various kinds on various surfaces.

(8) In an embodiment of the invention, THF and DMSO are preferably used in combination in a range of 4 weight % to 90 weight % THF and 4 weight % to 90 weight % DMSO. THF and DMSO can be used in combination in a range of 20 weight % to 75 weight % of THF and 20 weight % to 75 weight % of DMSO. THF and DMSO can be used in combination in a range of 4 weight % to 45 weight % of THF and 4 weight % to 45 weight % of DMSO. The weight percentages are based on the total weight percentage of the composition.

(9) In an embodiment of the invention, a composition for paint removal is provided. The paint remover composition generally comprises: 4 weight % to 45 weight % DMSO, 4 weight % to 45 weight % THF or other solvent, 0.5 weight % to 2 weight % cellulose ether thickener, 40 weight % to 60 weight % acetone, 0.2 weight % to 1.0 weight % paraffin, 0 weight % to 2 weight % nonionic surfactant, and 0 weight % to 5 weight % of a primary, secondary or tertiary amine, wherein the weight percentages are based on the weight of the total composition.

(10) A solvent is a single solvent or a combination of solvents. Preferably, the solvent is selected from the group consisting of THF, toluene, DMSO, dioxalane, 1,2 trans dichloroethylene, and a combination thereof. More preferably, the solvent is a combination of THF and DMSO. THF and DMSO in combination have found to have a synergistic effect in a paint remover.

(11) Other solvent combinations demonstrating a synergistic effect in a paint remover include, but are not limited to, THF and DMSO; toluene and DMSO; Dioxalane and DMSO; 1,2 trans dichloroethylene and DMSO; and a combination thereof.

EXAMPLES

Example 1

(12) Paint stripping tests were conducted in accordance with the present invention. The paint stripping test used a proposed formula in accordance with the present invention in which a solvent was varied in the tests. Stripping ability was measured after 15 and 30 minutes by scraping layers of paint off a board using a plastic scraper. Scraping was made at a low angle from the board without using pressure that would dig into the paint. The purpose was to see how much paint would remove with ease in the test in order to more accurately evaluate the effect of the chemical solvent on the paint without agitation (other than to remove the loosened and softened paint layers and not layers beneath that have not reacted to the stripper in the time period allowed).

(13) The paint panel was prepared as follows using Rust Oleum's Oil based paints:

(14) First layer Blue

(15) Second layer White

(16) Third layer Green

(17) Fourth layer Yellow

(18) Fifth layer Red

(19) The fifth layer was the top layer, and there were five layers in total. Each layer set for one 24 hour period before the next layer. Each coat of paint was rolled on in a usual manner using a standard 6″ long paint roller with a ¼″ nap. After the last application of paint, the boards were placed at 50 C for 30 days in order to cure further.

(20) The stripper formulation tested is set forth in Table 1:

(21) TABLE-US-00001 TABLE 1 10.0 weight % toluene 0.8 weight % paraffin wax (127° F. melting point) 1.25 weight % cellulose ether thickener (Tylose PS0810001) 29.5 weight % solvent (varied for testing purposes) 46.95 weight % acetone 10.0 weight % methanol 0.5 weight % nonionic surfactant (Tomadol 900) 1.0 weight % Aqua Ammonia (26 Deg. Baume)
Note that weight percentages are based on the total weight of the formulation.

(22) The solvents tested were:

(23) (1) Dimethyl sulfoxide (DMSO), (2) toluene, (3) 1, 2 trans dichloroethylene, (4) Dioxalane, and (5) Tetrahydrofuran (THF).

(24) The order of performance, greater to lower, of these 5 solvents were as follows with THF being the greater and 1, 2 transdichloroethylene being the lower: THF Toluene Dioxalane DMSO 1, 2 transdichloroethylene

(25) Blends of the experimental solvents were also tested.

(26) The base blend for these experiments was:

(27) TABLE-US-00002 TABLE 2 24.75 weight % DMSO 24.75 weight % solvent (varied for testing purposes) 1.25 weight % cellulose ether thickener (Tylose) 46.95 weight % acetone 0.8 weight % paraffin 0.5 weight % nonionic surfactant (Tomadol 900) 1.0 weight % aqua ammonia

(28) Note that weight percentages are based on the total weight of the formulation

(29) The stripping test results were visually inspected after setting 15 and 30 minutes.

(30) All of the blends tested demonstrated synergy; however, the THF/DMSO combination was the best performing synergistic blend. The order of performance found, from greater to lesser, was with THF/DMSO blend being greater and 1,2 trans dichloroethylene/DMSO blend being lesser: THF/DMSO Toluene/DMSO Dioxalane/DMSO 1,2 trans dichloroethylene/DMSO

(31) THF and DMSO were tested in various ratios of THF/DMSO: 50/50, 100/0, 0/100, 75/25, 25/75, 90/10, 10/90, 82.5/17.5, and 17.5/82.5.

Example 2

(32) Paint stripper formulations were tested in accordance with the present invention and are set forth in Table 3. The formulations were in a form of a liquid or an aerosol.

(33) TABLE-US-00003 TABLE 3 Components Weight Percentage (%) THF 49.5 Dye 0.002 Paraffin Wax (refined) 0.25 BHT 0.025 Acetone 40 to 45 Surfactant 1 Fumed Silica 0 to 5 Thickener  0.1 to 1.25 Diglycolamine 0.5 Aqua Ammonia 5

(34) It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements, will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention. Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiments, adaptations, variations, modifications and equivalent arrangements.