Corrosion-resistant paint remover composition and method for removing paint from a substrate

Abstract

A paint remover composition and a method for removing paint from porous and non-porous substrates are disclosed. The paint remover composition is an emulsion comprising 5% to 80% benzyl alcohol, 30% to 70% water, terpene olefins, and an effective concentration of alcohol ethoxylated phosphate esters for emulsifying the composition and providing corrosion inhibition.

Description

Technical Field

[0001] This invention relates to the field of paint removers, and more specifically, to corrosion-resistant emulsion compositions for effectively and safely removing paint and coatings from porous and non-porous substrates. Prior Technology

[0002] Paint removers (often also called paint strippers) have been used to repair antique furniture or wooden products (doors, frames, trim, etc.) and more recently for custom metal drinking vessels. Many of these items have been painted and repainted multiple times. This results in items with multiple layers of paint containing different chemical types and varying degrees of difficulty in removal. Paint removers are also used in the automotive body repair industry to aid in vehicle restoration. When paint removers are stored in metal containers or used on metal substrates, the ingredients can cause corrosion. Generally, corrosion is defined as the destructive erosion of a metal caused by an electrochemical or chemical reaction between the metal and its environment. More specifically, electrochemical erosion of metal surfaces is the wear and undercut of the metal, which is accelerated after protective coatings (such as oxide films) are removed by corrosive media. Recently, it has been found that some alkaline activators commonly used in paint remover compositions can exacerbate corrosion on certain metal substrates and darken wood substrates. Summary of the Invention

[0003] To provide a paint remover capable of removing various types of paint from various substrates, a paint remover composition is disclosed. The paint remover composition described herein prevents corrosion of metal containers and / or metal substrates and prevents discoloration of porous substrates such as wood.

[0004] In one aspect, the paint remover composition for removing paint and coatings is an emulsion comprising (a) 15% to 70% by weight of benzyl alcohol as a primary solvent based on the total weight of the composition; (b) 10% to 70% by weight of water based on the total weight of the composition; (c) an auxiliary solvent; and (d) an effective concentration of alcohol ethoxylate phosphate ester for emulsifying the composition and providing corrosion inhibition.

[0005] In some respects, based on the total weight of the composition, the composition contains 30% to 65% by weight, preferably 45% to 55% by weight, of water.

[0006] In some respects, based on the total weight of the composition, the composition contains 30% to 65% by weight, most preferably 45% to 55% by weight, of benzyl alcohol.

[0007] In some respects, benzyl alcohol and water are present in the composition in a ratio of 1.5:1 to 1:1.5, more preferably 1:1.

[0008] In some respects, the composition also contains an acidic accelerator. The acidic accelerator may be phosphoric acid, formic acid, glycolic acid, or a combination thereof.

[0009] In some respects, auxiliary solvents include dipentene, toluene, turpentine, mineral oils, xylene, DMSO, and combinations thereof.

[0010] In some respects, the composition also contains a thickener.

[0011] In some respects, the composition also contains a propellant.

[0012] In some respects, the composition contains an auxiliary corrosion inhibitor.

[0013] In some respects, the hydrophilic-lipophilic balance of alcohol ethoxylated phosphates is 3 to 7. In some respects, alcohol ethoxylated phosphates include monophosphates, diphosphates, or combinations thereof. In some respects, the degree of ethoxylation of the alcohol ethoxylated phosphate is 2 to 10. In some respects, the degree of ethoxylation of the alcohol ethoxylated phosphate is 3 to 5. In some respects, the alcohol ethoxylated phosphate comprises an alcohol chain with a length of 16 to 22 carbon atoms. In some respects, the alcohol chain is an oleyl alcohol.

[0014] In some aspects, the composition removes at least three layers of latex-based paint after one hour. In some aspects, the composition removes at least five layers of oil-based paint after twenty-four hours. In some aspects, when the composition is applied to a wood substrate, it results in an L value greater than -2 for the treated wood compared to untreated wood.

[0015] In some respects, the flash point of the composition is 70°F or higher. In some respects, the volatile organic compound (VOC) content of the composition is 50% by weight or lower, based on the total weight of the composition.

[0016] In another aspect, a method for removing paint from a substrate is disclosed. The method includes: (a) applying a paint remover composition as described above to a painted substrate, (b) leaving the composition on the painted substrate for a period of time, and (c) removing the paint from the substrate.

[0017] In some respects, the method removes latex-based paint. In some respects, the method removes at least three layers of latex-based paint after one hour. In some respects, the method removes oil-based paint. In some respects, the method removes at least three layers of oil-based paint after twenty-four hours.

[0018] Embodiments of the present invention may include one or more of the features and configurations described above, or any combination thereof.

[0019] Other features, aspects, and advantages of the invention will be set forth in the following detailed description, and some of these features, aspects, and advantages will readily become apparent to those skilled in the art from the description, or will be recognized by practicing the invention as described herein. It should be understood that both the foregoing general description and the following detailed description present various embodiments of the invention and are intended to provide an overview or framework for understanding the nature and characteristics claimed in the invention. Drawings are included to provide a further understanding of the invention and are incorporated into and constitute a part of the specification.

[0020] These and other features, aspects, and advantages of the invention can be better understood when the following detailed description of the invention is read with reference to the accompanying drawings, wherein: Simple Explanation of the Diagram

[0021] Figure 1A illustrates the ability of the exemplary composition to remove latex paint from a painted substrate. Figure 1B illustrates the ability of the comparative composition to remove latex paint from a painted substrate. Figure 2A illustrates the wood darkening properties of the exemplary and comparative compositions on oak. Figure 2B illustrates the wood darkening properties of the exemplary and comparative compositions on birch. Figure 2C illustrates the wood darkening properties of the exemplary and comparative compositions on pine wood. Figure 2D illustrates the wood darkening properties of the exemplary and comparative compositions on cedar. Figure 2E illustrates the wood darkening properties of the exemplary and comparative compositions on maple. Figure 2F illustrates the wood darkening properties of the exemplary and comparative compositions on poplar. Figure 2G illustrates the wood darkening properties of the exemplary and comparative compositions on cedar wood. Figure 2H illustrates the wood darkening properties of the exemplary and comparative compositions on white oak. Figure 3A shows the vertical adhesion of the exemplary composition and the comparative composition to an aluminum substrate after being applied at a 90° angle. Figure 3B shows the vertical adhesion of the exemplary composition and the comparative composition to an aluminum substrate 5 minutes after application at a 90° angle. Figure 3C shows the vertical adhesion of the exemplary composition and the comparative composition to an aluminum substrate 15 minutes after application at a 90° angle. Figure 3D illustrates the vertical adhesion of the exemplary composition and the comparative composition to an aluminum substrate 1 hour after application at a 90° angle. Figure 3E shows the vertical adhesion of the exemplary composition and the comparative composition to an aluminum substrate 7 hours after application at a 90° angle. Figure 3F shows the vertical adhesion of the exemplary composition and the comparative composition to an aluminum substrate 72 hours after application at a 90° angle. Figure 4A shows the vertical adhesion of the exemplary composition and the comparative composition to a painted wood substrate after being applied at a 90° angle. Figure 4B shows the vertical adhesion of the exemplary composition and the comparative composition to a coated wood substrate 5 minutes after application at a 90° angle. Figure 4C shows the vertical adhesion of the exemplary composition and the comparative composition to a coated wood substrate 15 minutes after application at a 90° angle. Figure 4D illustrates vertical adhesion of the exemplary and comparative compositions to a coated wood substrate one hour after application at a 90° angle. Figure 4E shows the vertical adhesion of the exemplary composition and the comparative composition to a coated wood substrate 7 hours after application at a 90° angle. Figure 4F shows the vertical adhesion of the exemplary composition and the comparative composition to a coated wood substrate 72 hours after application at a 90° angle. Figure 5A illustrates the vertical adhesion of the exemplary composition and the comparative composition to an untreated wood substrate after being applied at a 90° angle. Figure 5B shows the vertical adhesion of the exemplary composition and the comparative composition to an untreated wood substrate 5 minutes after application at a 90° angle. Figure 5C shows the vertical adhesion of the exemplary composition and the comparative composition to an untreated wood substrate 15 minutes after application at a 90° angle. Figure 5D illustrates the vertical adhesion of the exemplary composition and the comparative composition to an untreated wood substrate 1 hour after application at a 90° angle. Figure 5E shows the vertical adhesion of the exemplary composition and the comparative composition to an untreated wood substrate 7 hours after application at a 90° angle. Figure 5F shows the vertical adhesion of the exemplary composition and the comparative composition to an untreated wood substrate 72 hours after application at a 90° angle. Figure 6A illustrates the vertical adhesion data of the exemplary composition and the comparative composition on a coated wood substrate. Figure 6B illustrates the vertical adhesion data of the exemplary composition and the comparative composition on an untreated wood substrate. Figure 6C illustrates the vertical adhesion data of the exemplary composition and the comparative composition on an aluminum substrate. Figure 7A shows the paint removal of the exemplary composition and the comparative composition after they were applied to a painted wood substrate at a 70° angle and left to stand overnight. Figure 7B shows the paint removal of the exemplary composition and the comparative composition after they were applied to a painted wood substrate at a 70º angle and left to stand overnight, and then scraped off with a paint scraper. Figure 7C shows the paint removal of the exemplary composition and the comparative composition after they were applied to a painted wood substrate at a 90° angle and left to stand overnight. Figure 7D shows the paint removal of the exemplary and comparative compositions after they were applied at a 90º angle to a painted wood substrate and left to stand overnight, followed by scraping with a paint scraper. Implementation

[0022] The invention will now be described more fully below with reference to illustrated exemplary embodiments thereof. However, the invention may be embodied in many different forms and should not be construed as limited to the representative embodiments described herein. The purpose of providing exemplary embodiments is to make this disclosure both comprehensive and complete, and to fully express the scope of the invention, enabling those skilled in the art to make, use, and practice the invention.

[0023] Furthermore, the term "or" as used in this disclosure and the appended claims is intended to mean an inclusive "or," not an exclusive "or." That is, unless otherwise stated or clearly indicated from the context, the phrase "X employs A or B" is intended to mean any natural inclusive arrangement. In other words, the phrase "X employs A or B" is valid in any of the following cases: X employs A; X employs B; or X employs both A and B. Additionally, the article "a / an" as used in this application and the appended claims should generally be interpreted as meaning "one or more," unless otherwise stated or clearly indicated from the context. Throughout the specification and claims, unless the context otherwise requires, the following terms will have at least the meaning explicitly relevant herein. The meanings indicated below are not necessarily limiting of these terms, but merely illustrative examples of them. Unless the context clearly indicates otherwise, "a / an" and "the" can include plural references, and "in" can include "in," "at," and / or "on." The phrase "in one implementation" as used herein does not necessarily refer to the same implementation, although it can.

[0024] Concentration, quantity, and other numerical data may be expressed or presented in the form of ranges herein. It should be understood that such ranges are used merely for convenience and brevity, and therefore should be flexibly interpreted to include not only the values ​​explicitly listed as the limits of the range, but also all individual values ​​or subranges contained within the range, as if each value and subrange were explicitly listed. For example, a numerical range of "about 1 to 5" should be interpreted to include not only the explicitly listed values ​​of about 1 to about 5, but also individual values ​​and subranges within the specified range. Thus, the numerical range includes individual values ​​such as 2, 3, and 4, and subranges such as 1 to 3, 2 to 4, and 3 to 5, as well as the individual values ​​1, 2, 3, 4, and 5. The same principle applies to ranges that list only one value as a minimum or maximum value. Furthermore, this interpretation should apply regardless of the width of the range or the characteristics described. The foregoing also applies to any scales and / or scale ranges disclosed herein, as well as predetermined time ranges.

[0025] Paint remover composition

[0026] This article provides a paint removal emulsion composition with corrosion-inhibiting properties. The paint remover composition is formulated to remove one or more layers of paint from porous and non-porous surfaces (e.g., metal and / or wood). The composition is capable of cleanly removing paint layers without significantly darkening the underlying wood or surface.

[0027] Paint remover compositions contain a variety of solvents for swelling and stripping dried paint. These solvents are designed to dissolve various portions of the dried paint matrix, whether it originates from latex paint or oil-based paint. In solvent systems, conventional paint removers may contain primary amine components that can potentially interact with wood or wood-based substrates. Wood components that can interact with primary amine structures are naturally occurring tannins in wood or tannins added to impart a specific hue or color to the wood. Other components that may be present include metal salts such as copper and cadmium. Wood manufacturers may introduce these metal salts as preservatives or from wood processing steps. Therefore, these metal components can darken the wood through interactions with the oxidation of some primary amine compounds or through metal-amine complexation.

[0028] The paint remover compositions disclosed herein contain 15% to 70% by weight of benzyl alcohol, more preferably 30% to 65% by weight of benzyl alcohol, and most preferably 45% to 55% by weight of benzyl alcohol.

[0029] In addition, the paint remover composition contains 10% to 70% by weight of water, more preferably 30% to 65% by weight of water, and most preferably 45% to 55% by weight of water.

[0030] Paint remover compositions may include auxiliary solvents to hold the emulsions together and to disperse / suspend water in the oil phase of the emulsion. Based on the total weight of the composition, the paint remover composition comprises 1% to 50% by weight, more preferably 2% to 30% by weight, and most preferably 3% to 15% by weight of an auxiliary solvent. The auxiliary solvent may be ethanol, propanol, butanol, methanol, dimethyl sulfoxide (DMSO), Aromatic 100 (composed primarily of C9-C10 dialkylbenzenes and trialkylbenzenes), or Aromatic... 200 (mainly composed of C11-C16 aromatic hydrocarbons), alkylbenzene derivatives, benzyl alcohol, 2-butoxyethanol, diethylene glycol monobutyl ether acetate, propylene carbonate, tetrahydrofuran (THF), ethylbenzene, mesitylene, benzoylbenzene, 2-pentylbenzene, n-butylbenzene, naphthalene, methylnaphthalene, dichloromethane, mineral oils, toluene, xylene or isomers and xylene-containing mixtures, N,N-dimethylformamide (DMF), terpenes, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, kerosene, turpentine, extract residue (petroleum) mineral oils, dipentene, (+ / -)-limonene, (+)-limonene, (-)-limonene, citral, geraniol, linalool and combinations thereof.

[0031] The paint remover composition comprises an alcohol ethoxylated phosphate ester. The alcohol ethoxylated phosphate ester acts as a corrosion inhibitor and emulsifier in the paint remover composition. Based on the total weight of the composition, the paint remover composition comprises 0.1% to 5% by weight, preferably 0.3% to 4% by weight, and most preferably 0.5% to 3% by weight of an ethoxylated alcohol phosphate ester, wherein the alcohol is an unsaturated alcohol. The alcohol ethoxylated phosphate ester may comprise an alcohol chain with a carbon length of 16 to 22. The alcohol ethoxylated phosphate ester may comprise an oleyl alcohol. The hydrophilic-lipophilic balance value of the alcohol ethoxylated phosphate ester may be 3 to 7. The alcohol ethoxylated phosphate ester may comprise monophosphate, diphosphate, or a combination thereof. The alcohol ethoxylated phosphate ester should be soluble in the oil phase of a water-in-oil emulsion. This allows the alcohol ethoxylated phosphate ester and its activity to be located on the surface of the composition. The degree of ethoxylation affects the water / oil solubility of the alcohol ethoxylated phosphate ester. The degree of ethoxylation of alcohol ethoxylated phosphate esters can be from 2 to 10, more preferably from 3 to 5.

[0032] Passivation corrosion inhibitors (such as the alcohol ethoxylated phosphate esters used in this paper) cause a significant anodic shift in corrosion potential, forcing the metal surface into the passivation range. Two types of passivation corrosion inhibitors exist: oxidizing anions (such as chromate, nitrite, and nitrate), which can passivate steel in the absence of oxygen, and non-oxidizing ions (such as phosphate, tungstate, and molybdate), which require the presence of oxygen to passivate steel.

[0033] Paint remover compositions may optionally contain auxiliary corrosion inhibitors configured to inhibit corrosion of yellow metals such as copper and brass. Auxiliary corrosion inhibitors include, but are not limited to: VANLUBE® 871 (2,5-dimercapto-1,3,4-thiadiazole, alkyl polycarboxylate), VANCHEM® NATD (2,5-dimercapto-1,3,4-thiadiazole disodium), NACAP® (sodium mercaptobenzothiazole), ELCO® 461 (alkyl mercaptothiazole), Irgamet 39 (N,N-bis-(2-ethylhexyl)-arylmethyl-1H-benzotriazole-1-methylamine), Irgamet TT50 (sodium tolyltriazole), Irgamet 42 (ethanol, 2,2-(methyl-1H-benzotriazole-1-yl)methyliminobis), other benzotriazole derivatives, and combinations thereof.

[0034] Based on the total weight of the composition, the paint remover composition may optionally include 0.5% to 30% by weight, preferably 1% to 20% by weight, and most preferably 3% to 10% by weight of an acidic activator. The activator in the paint remover increases the penetration of the solvent into the paint.

[0035] The acidic activator in the paint remover composition may include a strong organic reducing agent (such as formic acid) as the activator. Other organic acids that are soluble in aromatic hydrocarbon solvents without oxidation (e.g., acetic acid and oxalic acid) are expected to be used as alternatives in the compositions of the present invention. The acidic activator is particularly preferred for removing old, accumulated paint layers from wood or other surfaces where corrosion inhibition is not required.

[0036] Paint remover compositions may optionally contain auxiliary solvents or blends of auxiliary solvents. The auxiliary solvents may be present at concentrations of 3% to 70% by weight, preferably 5% to 20% by weight, and more preferably 5% to 10% by weight. Examples of auxiliary solvents include: ethanol, propanol, butanol, methanol, dimethyl sulfoxide (DMSO), toluene, xylene or isomers and xylene-containing mixtures of ethylbenzene, Aromatic 100 (consisting primarily of C9-C10 dialkylbenzenes and trialkylbenzenes), Aromatic... 200 (mainly composed of C11-C16 aromatics), alkylbenzene derivatives, benzyl alcohol, 2-butoxyethanol, diethylene glycol monobutyl ether acetate, propylene carbonate, tetrahydrofuran (THF), turpentine, mineral oil (also known as liquid petrolatum or liquid paraffin), ethylbenzene, mesitylene, benzoylbenzene, 2-pentylbenzene, n-butylbenzene, naphthalene, methylnaphthalene, dichloromethane, N,N-dimethylformamide (DMF), terpenes, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, kerosene, raffinate (petroleum), mineral oils, dipentene ((+ / -)-limonene), citral, geraniol, linalool and combinations thereof.

[0037] Paint remover compositions may also contain additives, including but not limited to surfactants (preferably nonionic surfactants), ether compounds (e.g., diethyl ethylene glycol monobutyl ether), dyes, fragrances, thickeners, waxes, other additives, or combinations thereof.

[0038] Non-limiting examples of thickeners include hydroxypropyl methylcellulose thickeners such as METHOCEL™ 311 (Dow Chemical Company) or TYLOSE® PSO 81001 (ShinEtsu Se TYLOSE® GmbH & Co. KG), and hydroxypropyl cellulose thickeners such as KLUCEL™ PR (Ashland) and METHOCEL™ J75MS (HPMC Dow).

[0039] The total volatile organic compounds (VOCs) content of the paint remover composition (as defined by the Environmental Protection Agency (EPA) in 40 CFR 51.100) may be 50 percent by weight (%) or less, wherein the weight percentage is based on the weight of the total composition.

[0040] The flash point of the paint remover composition can be room temperature or 70°F above room temperature.

[0041] Paint remover compositions can be combined with propellants and, in combination with other components, delivered in aerosol form. Non-limiting examples of propellants include propane, butane, pentane, carbon dioxide, nitrous oxide, nitrogen, any other inert gas, and combinations thereof.

[0042] The viscosity of the paint remover composition was measured using a Brookfield viscometer (RVT#6 @ 20 rpm). The viscosity of the paint remover composition is preferably between 20,000 cps and 40,000 cps. The paint remover composition should have a sufficiently high viscosity to achieve the desired vertical adhesion, thus maintaining prolonged contact with the substrate to remove paint, but not so high that it cannot uniformly coat the substrate.

[0043] Methods to remove paint

[0044] A method for removing paint is also disclosed, comprising (a) applying the paint remover composition disclosed herein to a painted substrate; (b) retaining the composition on the painted substrate for a period of time; and (c) removing the composition and paint from the substrate; wherein the substrate does not change color after step (c). As described above, the disclosed paint remover composition is suitable for chemically stripping various types of paint from various surfaces. These paints include, for example, automotive paints and / or wall paints having multiple layers (i.e., primer layer, base / pigment layer, and topcoat / clear coat layer). In some respects, the paint to be removed has been applied to, for example, porous surfaces (sheetrock / gypsum board) and / or non-porous surfaces (metal or glass substrates).

[0045] Working Example

[0046] The corrosion inhibition effects of various corrosion inhibitors on various metallic substrates (brass, copper, steel, and aluminum) were analyzed, and the data are shown in Table 1. Corrosion inhibition of steel and / or aluminum was achieved using COLA® Fax 3397 (a water-soluble and oil-soluble alcohol ethoxylated phosphate with a degree of 4.5 ethoxylation) and SP CRODAFOSTM O3A MBAL-LQ-(MH) (an oil-soluble alcohol ethoxylated phosphate with a degree of 3 ethoxylation). VANLUBE® 871 also showed corrosion inhibition on steel.

[0047] Table 1 Test with the following substances: Substrate inhibition [Corrosion Inhibitor] [CAS] [Number] [Formic acid] [Phosphoric acid] [copper] [brass] [Steel] [aluminum] VANLUBE®871 126104-53-8 yes no yes yes yes n / a VANCHEM®NATD 55906-42-8 yes no yes yes no n / a NACAP® 2492-26-4 yes no yes yes no n / a ELCO®461 (alkyl mercaptothiadiazole) N / A yes no yes yes no n / a Irgamet 39 94270-86-7 yes yes yes yes no n / a BIO-SOFT® TA-2 61791-26-2 yes yes n / a n / a no no Triethanolamine 102-71-6 yes no n / a n / a no n / a PRIMINETM 81-R amine 68955-53-3 yes no n / a n / a no n / a HALOX® 630 125078-60-6 yes no n / a n / a no n / a HALOX® 570 171054-89-0 yes no n / a n / a no n / a Oleic acid 112-80-1 yes no n / a n / a no n / a Sarkosyl O 110-25-8 yes no n / a n / a no n / a Irgacor L 190 80584-91-4 yes no n / a n / a no n / a COLA® Fax 3397 (Oleol, Ethoxylate, Phosphate) 39464-69-2 yes yes n / a n / a yes no COLA®lube 3404 (Alkyl Phosphate) 12645-31-7 yes no n / a n / a no n / a Sodium nitrite 7632-00-0 yes no n / a n / a no n / a CRODAZOLINE™ O-NV-LQ 21652-27-7 yes yes n / a n / a no n / a Irgamet TT50 64665-57-2 yes no yes yes no no Irgamet 42 88477-37-6 no yes yes yes no n / a THIATE® U 109-46-6 yes no no no no no COLA® Cor 100 (Short-chain imidazoline) 68815-55-4 yes no no no no n / a monoethanolamine 141-43-5 yes no n / a n / a n / a no Morpholine 110-91-8 yes no n / a n / a n / a no LUBRIZOL® 219 (organozinc phosphate complex) 68457-79-4 yes yes n / a n / a n / a no DAPRAPHOS® ASI 80 (Alkylphosphonic acid in water and alkyl diol) 4724-48-5 yes yes n / a n / a n / a no COLA® Cor 700 (a mixture of alkanolamine borate and ammonium phosphate) 14852-17-6 yes yes n / a n / a n / a no COLA® Teric HLA 14960-06-6 yes yes n / a n / a n / a no COLA® Mid OA 93-83-4 yes no n / a n / a n / a no COLA® Liquid DO 405160-18-1 no yes n / a n / a n / a no COLA®Carb O2C 227310-69-2 no yes n / a n / a n / a no COLA® Cor KAT (a mixture of water-soluble phosphate esters) N / A no yes n / a n / a n / a no LUBRIZOL® 2061 (Polyphosphate) N / A no yes n / a n / a n / a no LUBRIZOL® 2062H (Polyphosphate) N / A no yes n / a n / a n / a no LUBRIZOL® 2063 (Polyphosphate) N / A no yes n / a n / a n / a no POLARTECH® BA 30T (Boron-containing corrosion inhibitor) N / A no yes n / a n / a n / a no SP CRODAFOSTM O3A MBAL-LQ-(MH) (Polyoxyethylene oil-based ether phosphate) 39464-69-2 yes yes n / a n / a yes no

[0048] An exemplary paint remover composition (Example 1) was prepared (as shown in Table 2) and compared with comparative paint remover compositions (Comparative Example 1 and Comparative Example 2) (as shown in Tables 3 and 4, respectively).

[0049] Table 2 [Example] [1] [CAS] [Number] [Function] [Weight Percentage] benzyl alcohol 100-51-6 solvent 40 water 7732-18-5 solvent 43.611 Dipentene (terpene) 68956-56-9 solvent 7.5 Phosphoric acid (85% aqueous solution) 7664-38-2 Activator 5.88 Irgamet 39 N,N-bis-(2-ethylhexyl)-arylmethyl-1H-benzotriazole-1-methylamine 94270-86-7 Yellow metal corrosion inhibitor 0.625 COLA® Fax 3397 (Alcohol Ethoxylated Phosphate) 39464-69-2 Corrosion inhibitors 1.0 Hydroxypropyl methylcellulose 9004-65-3 Thickener 0.65 Benzalkonium chloride sepiolite and benzalkonium chloride montmorillonite n / a Thickener / Stabilizer 0.4 paraffin 64742-43-4 Thickener 0.3 Orange dye n / a dye 0.03 Denatonium benzoate 3734-33-6 Oral deterrent 0.004

[0050] Table 3 [Comparative Example] [1] [CAS] [Number] [Function] [Weight Percentage] benzyl alcohol 100-51-6 solvent 42.5 polysaccharides 9005-25-8 Thickener / Stabilizer 27.3 water 7732-18-5 solvent 12.5 2-Butoxyethanol 111-76-2 solvent 7.5 2-(2-Aminoethoxy)ethanol 929-06-6 Activator 4.7 Hydrogenated light fraction (petroleum) 64742-47-8 Thickener / Stabilizer 3.0 Alkyl quaternary ammonium bentonite n / a Thickener / Stabilizer 0.5 Hydroxypropyl methylcellulose 9004-65-3 Thickener / Stabilizer 0.5 Ethoxy alcohol 68439-46-3 surfactants 0.5 Turpentine oil, pure gum spirits 7785-26-4 and 8006-64-2 solvent 1.0

[0051] Table 4 [Comparative Example] [2] [CAS] [Number] [Function] [Weight Percentage] water 7732-18-5 solvent 44.91 benzyl alcohol 100-51-6 solvent 40.0 Turpentine oil, pure pine resin turpentine oil 7785-26-4 and 8006-64-2 solvent 5.75 Formic acid (85% to 95%) 64-18-6 Activator 4.7 p-Menthol-1,4(8)-diene 586-62-9 solvent 2.63 Hydroxypropyl cellulose 9004-64-2 Thickener 1.0 Benzalkonium chloride sepiolite and benzalkonium chloride montmorillonite n / a Thickener / Stabilizer 0.5 Refined paraffin wax 64742-43-4 Thickener 0.3 Polyoxyethylene sorbitan trioleate 9005-70-3 surfactants 0.5 Sorbitol trioleate 26266-58-0 surfactants 0.5 Orange dye n / a dye 0.05

[0052] [Paint Removal Time]

[0053] Each paint remover composition, along with comparative paint remover compositions, was evaluated on latex-based and oil-based paints. Each board was coated with five coats of paint of different colors, which had dried and aged for at least two years. Each composition (Example 1, Comparative Example 1, and Comparative Example 2) was applied to the boards. The ability of each composition to remove each coat of paint at 15 minutes, 30 minutes, 1 hour, and more than 2 hours is recorded in Tables 6 and 7.

[0054] Table 6 [Paint Type] [Board Number] [composition] [time] [Number of layers removed] Latex-based paint 1 Example 1 15 minutes 0 30 minutes 2 1 hour 5 2 hours+ 5 Comparative Example 2 15 minutes 0 30 minutes 2 1 hour 5 2 hours+ 5 Comparative Example 1 15 minutes 0 30 minutes 1 1 hour 4 2 hours+ 5 2 Example 1 15 minutes 1 30 minutes 4 1 hour 5 2 hours+ 5 Comparative Example 2 15 minutes 1 30 minutes 5 1 hour 5 2 hours+ 5 Comparative Example 1 15 minutes 1 30 minutes 2 1 hour 2 2 hours+ 5 3 Example 1 15 minutes 1 30 minutes 1 1 hour 3 2 hours+ 5 Comparative Example 2 15 minutes 1 30 minutes 2 1 hour 4 2 hours+ 5 Comparative Example 1 15 minutes 1 30 minutes 1 1 hour 3 2 hours+ 5 4 Example 1 15 minutes 1 30 minutes 2 1 hour 4 2 hours+ 5 Comparative Example 2 15 minutes 1 30 minutes 2 1 hour 5 2 hours+ 5 Comparative Example 1 15 minutes 0 30 minutes 1 1 hour 3 2 hours+ 5 7 Example 1 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5 Comparative Example 2 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5 Comparative Example 1 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5 8 Example 1 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5 Comparative Example 2 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5 Comparative Example 1 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5

[0055] The graphs in Figures 1A and 1B visually illustrate the latex paint removal data from Table 6. Comparing the slopes of each graph, it can be seen that the latex paint peeling time in Example 1 increased by 27% compared to Comparative Example 1.

[0056] Table 7 [Paint Type] [Board Number] [composition] [time] [Number of layers removed] Oil-based paint 5 Example 1 1 hour 0 2 hours 0 3 hours 0 4 hours 0 5 hours 0 6 hours 0 8 hours 0 16 hours 5 Comparative Example 2 1 hour 0 2 hours 0 3 hours 0 4 hours 0 5 hours 0 6 hours 0 8 hours 0 16 hours 5 Comparative Example 1 1 hour 0 2 hours 0 3 hours 0 4 hours 0 5 hours 0 6 hours 0 8 hours 0 16 hours 0 6 Example 1 1 hour 0 2 hours 0 3 hours 0 4 hours 0 5 hours 0 6 hours 0 8 hours 0 16 hours 5 Comparative Example 2 1 hour 0 2 hours 0 3 hours 0 4 hours 5 5 hours 0 6 hours 0 8 hours 5 16 hours 5 Comparative Example 1 1 hour 0 2 hours 0 3 hours 0 4 hours 0 5 hours 0 6 hours 0 8 hours 5 16 hours 5 7 Example 1 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5 Comparative Example 2 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5 Comparative Example 1 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5 8 Example 1 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5 Comparative Example 2 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5 Comparative Example 1 1 hour 5 2 hours 5 3 hours 5 4 hours 5 5 hours 5 6 hours 5 8 hours 5 16 hours 5

[0057] [Corrosion Inhibition]

[0058] The paint remover formulation (Example 1) was tested using the United Nations Manual of Tests and Criteria, Section 37, to determine its effect on the corrosion of aluminum and steel. The results are shown in Table 8. The composition showed increased corrosion on both aluminum and steel substrates.

[0059] Table 8 [Quality loss] [%] [aluminum] [steel] Submerged 2.51% 1.06% Half / Half 1.07% 0.50% Top space -0.01% 0.20%

[0060] [The wood has darkened]

[0061] Table 9 shows the wood darkening measured using a colorimeter (a precise color reader, model WR-10QC, manufactured by Shenzhen Wave Optoelectronics Technology Co., Ltd.). L values ​​were measured for various wood types before and after the application of different paint removers (Example 1 and Comparative Example 1). A negative L value indicates wood darkening. Comparative Example 1 showed negative L values ​​for every type of wood, thus demonstrating that it caused significant wood darkening. Example 1 showed negative L values ​​only for two types of wood (i.e., cedar and maple). Overall, compared to Comparative Example 1, Example 1 resulted in less wood darkening on each wood type, and the L values ​​were significantly improved. Figures 2A to 2H show the differences in wood darkening between Example 1 and Comparative Example 1 on various wood types compared to the untreated sample. Comparative Example 1 caused significant darkening on each wood type, while Example 1 caused slight wood darkening compared to Comparative Example 1.

[0062] Table 9 Wood type composition L at the top of the test area L in the middle part of the test area L at the bottom of the test area Average L Change in L value compared to "untreated" oak Unprocessed 67.71 68.52 65.95 67.39 Comparative Example 1 66.07 66.42 68.04 66.84 -0.55 Example 1 70.65 68.88 70.42 69.98 2.59 birch Unprocessed 80.15 79.42 78.28 79.28 Comparative Example 1 70.17 70.64 71.59 70.80 -8.48 Example 1 80.21 80.73 80.39 80.44 1.16 pine wood Unprocessed 79.49 80.88 77.19 79.19 Comparative Example 1 70.78 72.6 72.93 72.10 -7.08 Example 1 81.90 78.73 80.53 80.39 1.20 Chinese fir Unprocessed 82.08 81.30 80.66 81.35 Comparative Example 1 74.79 74.91 74.88 74.86 -6.49 Example 1 80.90 81.51 79.35 80.59 -0.76 maple Unprocessed 81.68 81.91 81.34 81.64 Comparative Example 1 76.98 75.71 77.00 76.56 -5.08 Example 1 80.42 80.05 79.72 80.06 -1.58 poplar Unprocessed 78.65 78.68 79.9 79.08 Comparative Example 1 75.96 77.32 77.41 76.90 -2.18 Example 1 82.03 79.74 80.67 80.81 1.74 cedar wood Unprocessed 54.86 52.96 60.98 56.27 Comparative Example 1 51.79 51.4 57.82 53.67 -2.60 Example 1 59.94 57.63 61.22 59.60 3.33

[0063] Figures 3A to 3F, 4A to 4F, and 5A to 5F illustrate the difference in effect between Comparative Example 1 (left) and Example 1 (right) on an aluminum substrate at 90 degrees. Figure 3A shows the direct results after each composition was applied to the aluminum substrate. Figures 3B (5 minutes), 3C (15 minutes), 3D (1 hour), 3E (7 hours), and 3F (72 hours) show the results after each composition was applied to the aluminum substrate for a period of time. The residence time or vertical adhesion of the composition increases the time the composition remains on the surface and removes the paint. Although there was no significant observable difference in viscosity between the two compositions, the residence time of Example 1 was significantly increased, as shown in Figures 3A to 3F, which show that after 72 hours on the aluminum substrate, the composition advanced only 3 inches, compared to nearly 10 inches in 72 hours for Comparative Example 1. The increased distance advanced caused the composition to dry prematurely and prevented further paint removal. Because Example 1 did not advance as far, it remained wet and was able to remove the paint. Figures 4A to 4F show the same studies conducted on coated wood substrates using Comparative Example 1 (left) and Example 1 (right). Comparative Example 1 advanced more than 7 inches, while Example 1 advanced about 3 inches, achieving similar results. Figures 5A to 5F show the same studies conducted on untreated wood substrates using Comparative Example 1 (left) and Example 1 (right). Comparative Example 1 advanced more than 7 inches, while Example 1 advanced about 2.5 inches, achieving similar results.

[0064] The research data shown in Figures 3A to 3F, 4A to 4F, and 5A to 5F are illustrated in Figures 6A to 6C. The vertical adhesion data for the coated wood substrate (Figure 6A) clearly shows that Example 1 has a longer vertical adhesion or residence time than Comparative Example 1. The vertical adhesion data for the untreated wood substrate (Figure 6B) clearly shows that Example 1 has a longer vertical adhesion or residence time than Comparative Example 1. The vertical adhesion data for the aluminum substrate (Figure 6C) clearly shows that Example 1 has a longer vertical adhesion or residence time than Comparative Example 1.

[0065] [Overall Effect]

[0066] Figures 7A and 7B show the difference in performance between Comparative Example 1 (left) and Example 1 (right) on an oil-based paint-coated substrate at a 70° angle. Both compositions were applied and left on the substrate overnight (16 to 18 hours). Figure 7A shows the paint removal effect before scratching, while Figure 7B shows the paint removal effect after scratching. Figures 7C and 7D show the difference in performance between Comparative Example 1 (left) and Example 1 (right) on an oil-based paint-coated substrate at a 90° angle. Both compositions were applied and left on the substrate overnight. Figure 7C shows the paint removal effect before scratching, while Figure 7D shows the paint removal effect after scratching. When observing Figures 7A to 7D, at both 70° and 90° angles, Example 1 (right) exhibits a higher paint removal effect / performance than Comparative Example 1 (left). The increased dwell time or vertical adhesion of Example 1 allows the composition to penetrate the paint layer and remove each layer of paint.

[0067] The foregoing description provides embodiments of the invention by way of example only. It is conceivable that other embodiments may perform similar functions and / or achieve similar results. Any and all such equivalent embodiments and examples are within the scope of the invention and are intended to be covered by the appended claims.

[0068] none

Claims

1. A paint remover composition comprising: a. 15% to 70% by weight of a primary solvent based on the total weight of the composition, wherein the primary solvent is benzyl alcohol; b. 10% to 70% by weight of water based on the total weight of the composition; c. an auxiliary solvent comprising dipentene, toluene, turpentine, mineral oil, xylene, DMSO, and combinations thereof; and d. an alcohol ethoxylated phosphate ester for emulsifying the composition and providing an effective concentration for corrosion inhibition, wherein the alcohol ethoxylated phosphate ester comprises an alcohol chain with a carbon length of 16 to 22; wherein the composition is a water-in-oil emulsion.

2. The paint remover composition as claimed in claim 1, wherein the composition further comprises an acid activator.

3. The paint remover composition as claimed in claim 1 or 2, wherein the acidic activator comprises phosphoric acid, formic acid, glycolic acid, or a combination thereof.

4. The paint remover composition as claimed in claim 1 or 2, wherein the composition further comprises a thickener.

5. The paint remover composition as claimed in claim 1 or 2, wherein the composition further comprises a propellant.

6. The paint remover composition as claimed in claim 1 or 2, wherein the composition further comprises an auxiliary corrosion inhibitor.

7. The paint remover composition as claimed in claim 1 or 2, wherein the benzyl alcohol and water are present in the composition in a ratio of 1.5:1 to 1:1.5 relative to each other.

8. The paint remover composition as claimed in claim 1 or 2, wherein the benzyl alcohol and water are present in the composition in a 1:1 ratio relative to each other.

9. The paint remover composition as claimed in claim 1 or 2, wherein the hydrophilic-lipophilic balance of the alcohol ethoxylated phosphate ester is 3 to 7.

10. The paint remover composition as claimed in claim 1 or 2, wherein the alcohol ethoxylated phosphate comprises a monophosphate, a diphosphate, or a combination thereof.

11. The paint remover composition as claimed in claim 1 or 2, wherein the degree of ethoxylation of the alcohol ethoxylated phosphate ester is 2 to 10.

12. The paint remover composition as claimed in claim 1 or 2, wherein the degree of ethoxylation of the alcohol ethoxylated phosphate ester is 3 to 5.

13. The paint remover composition as claimed in claim 1, wherein the alcohol chain is an oleyl alcohol.

14. The paint remover composition as claimed in claim 1 or 2, wherein the composition removes at least three layers of latex-based paint after one hour.

15. The paint remover composition as claimed in claim 1 or 2, wherein the composition removes at least five layers of oil-based paint after twenty-four hours.

16. The paint remover composition as claimed in claim 1 or 2, wherein when the composition is applied to wood, the treated wood results in an L value greater than -2 compared to untreated wood.

17. The paint remover composition as claimed in claim 1 or 2, wherein the flash point of the composition is 70℉ or higher.

18. The paint remover composition as claimed in claim 1 or 2, wherein the volatile organic compound (VOC) content of the composition is 50% by weight or less based on the total weight of the composition.

19. A method for removing paint from a substrate, the method comprising: a. Applying the composition as described in any one of claims 1 to 18 to a coated substrate; b. Leave the composition on the coated substrate for a period of time; c. Remove paint from the substrate.

20. The method of claim 19, wherein the substrate is metal or wood.

21. The method as described in claim 19 or 20, wherein the method removes at least three layers of latex-based paint after one hour.

22. The method as described in claim 19 or 20, wherein the method removes at least five layers of oil-based paint after twenty-four hours.

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