WO2020142273A1 - Compositions et procédés pour éliminer des revêtements de surfaces - Google Patents

Compositions et procédés pour éliminer des revêtements de surfaces Download PDF

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Publication number
WO2020142273A1
WO2020142273A1 PCT/US2019/067900 US2019067900W WO2020142273A1 WO 2020142273 A1 WO2020142273 A1 WO 2020142273A1 US 2019067900 W US2019067900 W US 2019067900W WO 2020142273 A1 WO2020142273 A1 WO 2020142273A1
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Prior art keywords
composition
composition according
compositions
coating
minutes
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PCT/US2019/067900
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English (en)
Inventor
Bart ENGENDAHL
Abigail GIARROSSO
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Fourth Principle, Llc
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Publication of WO2020142273A1 publication Critical patent/WO2020142273A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/26—Organic compounds containing oxygen
    • C11D7/263—Ethers
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/26—Organic compounds containing oxygen
    • C11D7/266—Esters or carbonates

Definitions

  • Disclosed herein are methods of removing at least a portion of a coating from a surface the methods including contacting the surface with a composition, the composition having a set of Hansen Solubility Parameters of: 14 ⁇ 5D ⁇ 18; 4 ⁇ 5P ⁇ 7, and 8 ⁇ dH ⁇ 9.5; and removing at least a portion of the coating from the surface.
  • compositions having a set of Hansen Solubility Parameters of: 14 ⁇ d ⁇ ⁇ 18, 4 ⁇ dR ⁇ 7 and 8 ⁇ dH ⁇ 9.5.
  • Figure 1 A shows a photograph of the gasket containing Example 1 after 20 minutes but prior to scraping, after 20minutes after scraping (Figure IB), after 40 minutes after scraping (Figure 1C) and after 60 minutes after scraping ( Figure ID).
  • Figure 2A shows a photograph of the gasket containing Example 2 after 20 minutes, 40 minutes (Figure 2B) and 60 minutes after scraping (Figure 2C).
  • Figure 3 A shows a photograph of the gasket containing Example 3 after 20 minutes prior to scraping, after 20minutes after scraping (Figure 3B), and after 40 minutes after scraping ( Figure 3C).
  • Figure 4A shows a photograph of the gasket containing Example 4 after 20 minutes, 40 minutes ( Figure 4B) and 60 minutes after scraping ( Figure 4C).
  • Figure 5A shows a photograph of the gasket containing Example 5 after 20 minutes, 40 minutes (Figure 5B) and 60 minutes after scraping (Figure 5C).
  • compositions for removing coatings from surfaces have been available for many years. They typically operate using two standard principles: chemical action or solvent power. Compositions employing chemical action usually include acidic or basic compounds. Some such compositions are described in CIS Pat. Nos. 5,454,985 and 3,681,250. Compositions such as these can be undesirable since they can alter metal surfaces. They have also been known to discolor wood if extensive care is not taken to remove the composition in its entirety after application.
  • compositions that rely on the solvent power of the components can be broken down into four groups: halogenated organic compounds; N-methyl pyrrolidone; flammable compositions; and dibasic esters. Each of these types of compositions have their own drawbacks.
  • compositions to remove coatings from surfaces that include halogenated organic compounds such as methylene chloride for example can be exemplified by US Pat. No. 2,507,983. Such compositions are undesirable because halogenated hydrocarbons are known carcinogens and have multiple adverse health effects. While it would be beneficial for compositions that remove coatings to be substantially free of halogenated hydrocarbons, the use of methylene chloride is often used in this manner due its fast-acting performance.
  • compositions for removing coatings from surfaces include N-methyl
  • N-methyl pyrrolidone based compositions have been developed as a“safe” alternative to methylene chloride based compositions since they can be classified as fast-acting compositions. While such compositions are not known carcinogens, they are a reproductive toxin and can have long-lasting negative effects on the central nervous system.
  • Flammable compositions for removing coatings from surfaces are exemplified by WO2018/039415A1. Such compositions are not desirable due to the inherent risk of fire associated therewith.
  • a final class of compositions for removing coatings from surfaces include dibasic esters.
  • compositions including dibasic esters are generally considered safe, because they are substantially free of halogenated organic compounds and reprotoxic compounds, and are non flammable.
  • An example of such compositions are described in US Pat. No. 4,927,556.
  • a significant drawback of these compositions, however, is that they exhibit a slow relative performance compared to the other solvent powered compositions described above.
  • compositions relying on solvent power can be characterized using Hansen Solubility parameters.
  • the Hansen Solubility parameters describe the miscibility of liquids and their ability to dissolve polymers.
  • the Hansen Solubility parameters augment the basic principle of“like dissolves like” (the solubility of polar and non polar solutes and solvents) with numerical quantifiable values derived from total cohesion energy and are thus based in the thermodynamic principles of liquid mixtures.
  • solubility parameters There are three solubility parameters: the dispersion solubility parameter 5D, the polar solubility parameter 5P, and the hydrogen bonding solubility parameter dH. They are derived from total cohesive energy as defined by Hansen as the sum of the dispersion cohesive energy (ED), poplar cohesive energy (Ep) and hydrogen bonding cohesive energy (EH) and the molecular volume of a compound.
  • compositions including N-methyl pyrrolidone compositions including benzyl alcohol
  • compositions including dimethyl adipate, dimethyl succinate and dimethyl glutarate
  • compositions including methylene chloride show a high efficacy in stripping paint but are highly toxic.
  • methylene chloride can cause acute and chronic effects on the central nervous system.
  • Compositions including methylene chloride have Hansen solubility parameters of d ⁇ 16.7 dR 8.1 dH 9.4.
  • compositions including N-methyl pyrrolidone show a good efficacy in stripping paint but are toxic.
  • N-methyl pyrrolidone is known to be a reproductive toxin.
  • Compositions including N-methyl pyrrolidone have Hansen solubility parameters of d ⁇ 17.1 dR 9.8 dH 7.8.
  • Compositions including benzyl alcohol exhibit a slow rate of removal of coatings from surfaces, yet they are generally considered safe.
  • Compositions inlcuding benzyl alcohol have Hansen solubility parameters of 5D 18.4 5P 6.3 dH 13.7.
  • compositions including dimethyl adipate, dimethyl succinate and dimethyl glutarate exhibit a slow rate of removal of coatings from surfaces yet they are generally considered safe.
  • compositions including dimethyl adipate, dimethyl succinate and dimethyl glutarate have Hansen solubility parameters of d ⁇ 17.1 dR 9.8 dH 7.8.
  • compositions for removing one or more coatings from a surface have a dispersion solubility parameter d ⁇ from 14 to 18; a polar solubility parameter dR from 4 to 7; and a hydrogen bonding solubility parameter dH from 8 to 9.5 (14 ⁇ d ⁇ ⁇ 18; 4 ⁇ dR ⁇ 7 and 8 ⁇ dH ⁇ 9.5).
  • disclosed compositions for removing one or more coatings from a surface have a dispersion solubility parameter d ⁇ from 16 to 17.5; a polar solubility parameter dR from 5 to 6.5; and a hydrogen bonding solubility parameter dH from 8 to 8.7(16 ⁇ d ⁇ ⁇ 17.5, 6.5 ⁇ dR > 5 and 8 ⁇ dH > 8.7).
  • disclosed compositions having Hansen solubility parameters such as those noted herein do not include acidic or basic compounds and are still desirably fast acting compositions.
  • Components of disclosed compositions can be described by the molecular volume thereof.
  • disclosed compositions have a relative sum of the molecular volume of the composition of not less than 90 mL/mol. In some embodiments, disclosed compositions have a relative sum of the molecular volume of the composition of not less than 1 lOmL/mol. In some embodiments, disclosed compositions have a relative sum of the molecular volume of the composition of not less than 130mL/mol.
  • compositions that can efficiently remove coatings from surfaces in a short amount of time have both a relative sum of the molecular volume of said compositions as well as their individual components that is smaller than 80 mL/mol.
  • compositions including relatively high molecular volume components e.g., benzyl alcohol (104 mL/mol) and dimethyl glutarate (152 mL/mol) have previously been slow acting.
  • disclosed compositions include components with high molecular volumes but are advantageously fast acting in removing coatings from surfaces.
  • compositions can include one or more compounds according to formula I, which can also be described as a high molecular volume component:
  • levulinic acid esters are methyl levulinate, ethyl levulinate, n-propyl levulinate, i-propyl levulinate, n-butyl levulinate, iso-butyl levulinate, sec-butyl levulinate, isoamyl levulinate, pentyl levulinate and hexyl levulinate.
  • acetoacetic acid esters are methyl acetoacetate, ethyl acetoacetate, n-propyl acetoacetate, i-propyl acetoacetate, n-butyl acetoacetate, i-butyl acetoacetate, sec-butyl acetoacetate, isoamyl acetoacetate, pentyl acetoacetates and hexyl acetoacetates.
  • disclosed compositions can have greater than 25 wt%, greater than 40 wt%, or greater than 45 wt% of one or more compounds of Formula I. In some embodiments, disclosed compositions can have less than 75 wt%, less than 60 wt%, or less than 55 wt% of one or more compounds of Formula I. In some embodiments, disclosed compositions can include 50 wt% of one or more compounds of Formula I.
  • compositions can include one or more compounds according to formula II, which can also be described as a high molecular volume component:
  • R is a C1-C6 alkyl
  • 1 to 5 are each independently H or a C1-C5 alkyl.
  • cinnamatic acid esters include methyl cinnamate, ethyl cinnamate, n-propyl cinnamate, i-propyl cinnamate, n-butyl cinnamate, iso butyl cinnamate, sec-butyl cinnamate, isoamyl cinnamate, pentyl cinnamate and hexyl cinnamate for example.
  • compositions can include one or more glycol ethers.
  • Glycol ethers are the condensation product of glycols with alcohols.
  • Illustrative glycol ethers include but are not limited to, Ethylene glycol monomethyl ether (2-methoxy ethanol), Ethylene glycol monoethyl ether (2-ethoxyethanol), Ethylene glycol monopropyl ether (2-propoxyethanol), Ethylene glycol monoisopropyl ether (2 -isopropoxy ethanol), Ethylene glycol monobutyl ether (2-butoxyethanol), Ethylene glycol monophenyl ether (2-phenoxyethanol), Ethylene glycol monobenzyl ether (2 -benzyloxy ethanol), Propylene glycol methyl ether, (l-methoxy-2- propanol), Propylene glycol mono butyl ether (l-butoxy-2-propalnol), Diethylene glycol monomethyl ether (2-(2-methoxy ethanol),
  • compositions can include one or more propylene glycol ethers.
  • propylene glycol ethers are Propylene glycol methyl ether, (1-m ethoxy -
  • compositions can include at least one glycol ether with a
  • compositions can include at least one glycol ether and at least one carboxylic acid ester. In some embodiments disclosed compositions can include at least two different carboxylic acid esters.
  • compositions may also include one or more auxiliary solvents.
  • Auxiliary solvents are preferably chosen from the group of alcohols, amines, carboxylic acid esters.
  • auxiliary solvents are ethanol, ethylene glycol, 2-propanol, 1,2-propanediol, propylene glycol, 1,2-butanediol, 1,3-butanediol, and glycerol, 1,2-Hexanediol, l,3-Dioxolan-2- one, 4-ethyl- 1 -(2 -Methoxy-l-methylethoxy)-2-propanol, 1-Dodecanol, l-Methoxy-2-propanol, l-Propoxy-2-propanol, 1-Undecanol, 2,2-dimethyl-l,3-Dioxolane-4-methanol, 2-Methyl-2,4- pentanediol, 3 -Methoxybutyl acetate, 3 -Methyl-3 -meth
  • Glycerol octanoate decanoate Isopropyl 3-hydroxybutyrate, Isopropyl myristate, Methyl laurate, Methyl oleate, 2-methyl-Pentanedioic acid, 1,5 -dimethyl ester, Pentylene glycol, 1 (or 2)-2- methoxymethyl ethoxy Propanol acetate, Propylacetate, Propylene carbonate, Propylene glycol methyl ether acetate, Propylene glycol n-butyl ether, Tetraethylene glycol, Tripropylene glycol, Tripropylene glycol n-butyl ether, White mineral oil, and petroleum.
  • composition could easily present a potential hazard that could cause fire or explosion.
  • compositions having a flashpoint below 38°C are considered flammable as defined by the Occupational Safety and Health Administration (OSHA) standards. In some embodiments, disclosed compositions have a flash point above 38°C and can therefore be considered non flammable.
  • OSHA Occupational Safety and Health Administration
  • Non-combustible compositions have a flash point above 66 °C according to the United States Consumer Products Safety Commission (US CPSC) and above 93 °C according to OSHA and Globally Harmonized System for Hazard Communication (GHS) standards.
  • US CPSC United States Consumer Products Safety Commission
  • GHS Globally Harmonized System for Hazard Communication
  • disclosed compositions have a flash point above 66°C and in some embodiments disclosed compositions have a flash point above 93 °C, for example.
  • compositions can optionally include one or more additives.
  • the additive(s) can be selected to achieve a desired property.
  • the additive(s) can also be selected to not significantly adversely affect a desired property of the composition.
  • the additive can be selected from thickeners, wetting agents, colorants, rinsing agents, evaporation inhibitors, activators, corrosion inhibitors, surfactants, fillers, combinations thereof, and the like. In some embodiments, the additive can be selected from thickeners, evaporation inhibitors, surfactants, fillers, and combinations thereof. Thickeners are generally used to increase the viscosity of the composition.
  • Illustrative thickeners can include, for example, cellulose ethers (e.g., hydroxypropyl cellulose, ethyl cellulose, ethyl hydroxyethyl cellulose, methyl cellulose, and other alkyl or hydroxyalkyl cellulose, and combinations thereof); silica including colloidal silica; clays (e.g., bentonite and montmorillonite starch); alumina including colloidal alumina; gum arabic; tragacanth; agar; sugar derivatives; high molecular weight polyethylene oxides; fatty acid salts; guar gum; xanthan gum; polyvinyl pyrrolidone and methyl vinyl ether/maleic anhydride copolymers; paraffinic waxes (e.g., polyethylene wax); and the like, or a combination thereof.
  • Evaporation inhibitors can be used to reduce evaporation of the composition, thus increasing the amount of contact time with a coating to be removed.
  • Illustrative evaporation inhibitors can include, for example, film forming resins, acrylic resins, hydrocarbon resins (such as polyethylene), waxes (such as paraffin wax and ester waxes), or a combination thereof.
  • Surfactants can be used to enhance wetting or penetration of the composition onto or into a coating.
  • Illustrative surfactants can be anionic, cationic, nonionic, or amphoteric, and can include, for example, polyoxyethylene derivatives of aromatic and aliphatic alcohols, (e.g., nonyl phenoxy polyoxyethylene ethanol), alkali metal salts of C8-22 aliphatic sulfates (e.g., sodium lauryl sulfate, and the like), alkali metal salts of alkyl aromatic sulfonates (e.g., sodium dodecyl benzene sulfonate, and the like), dialkyl sulfosuccinates (e.g., dioctyl sulfosuccinate, and the like), and the like, and combinations thereof.
  • polyoxyethylene derivatives of aromatic and aliphatic alcohols e.g., nonyl phenoxy polyoxyethylene ethanol
  • alkali metal salts of C8-22 aliphatic sulfates e.g.,
  • Illustrative fillers are generally used to increase the volume of the composition by not affecting its efficiency.
  • Illustrative fillers can include, for example, liquid fillers such as water, glycerol, 1,3-propylene glycol or vegetable oils such as Coconut oil, Corn Com oil, Olive oil, Palm oil, Soybean oil; solid fillers can include organic fillers sugars and sugar derivatives such as maltodextrins, Carrageenan, Sodium starch, Sorbitol, Com sugar syrup, D-Glucose, Dextrin, as well as inorganic fillers such as salts like sodium chloride, Calcium carbonate, Calcium chloride, Calcium silicate, Cellulose regenerated, Glass fibers, Limestone, Magnesium carbonate, Magnesium chloride, Magnesium sulfate, Maltodextrin, Perlite, Polyglycerol, Potassium bicarbonate, Potassium, Potassium chloride, Potassium silicate, Potassium sulfate,
  • optional additive(s) can be included in the composition in an amount greater than 0 to 90 weight percent, or 30 to 50 weight percent, based on the total weight of the composition.
  • optional additives can be chosen to create a composition that includes one or more phases. Multiple phases may be desirable to reduce the content of certain active compounds and replace them by certain non-active compounds.
  • compositions comprising multiple phases can be colloidal suspensions.
  • a colloid suspension is a mixture in which one substance of dispersed (e.g., microscopically dispersed) insoluble particles is suspended throughout another substance.
  • the dispersed-phase particles can have a diameter between approximately 1 and 1000 nanometers.
  • One type of colloidal suspension is called an emulsion.
  • An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable).
  • Emulsions are liquids comprised of at least two phases: a dispersed phase and a continuous phase. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
  • useful emulsions can include water in oil emulsions, oil in water emulsions, micro emulsions, nano emulsion, or Pickering emulsions for example.
  • a gel like composition can be advantageous in order to facilitate easy application of the composition to a surface.
  • a gel like composition can be described as having a viscosity of not less than 15,000cps, for example.
  • the viscosity of a fluid is the measure of its resistance to gradual deformation by shear stress or tensile stress.
  • Compositions having a viscosity less than 15,000cps can easily flow off vertical surfaces, thereby making them more difficult to use.
  • the composition to remove coatings from surfaces will not easily flow off vertical surfaces.
  • the viscosity of disclosed compositions increases, the diffusion of active compounds into the coating is limited and the speed at which a composition can act on the surface to be removed can be limited.
  • compositions can have a viscosity of not greater than 40,000cps.
  • the viscosity of disclosed compositions can be considered a compromise between a desirably higher viscosity so the composition can be maintained on a vertical surface and a desirably lower viscosity so the composition can still be relatively fast acting.
  • disclosed compositions can have a viscosity between 15,000cps and 40,000 cps, for example.
  • the composition can be substantially free of certain compounds.
  • the term “substantially free” means that the composition includes less than or equal to 10 volume percent, or less than or equal to 5 volume percent, or less than or equal to 1 volume percent, or less than or equal to 0.5 volume percent, or less than or equal to 0.1 volume percent of the recited solvent.
  • the composition is substantially free of chlorinated organic compounds such as methylene chloride.
  • the composition is substantially free of N-methylpyrrolidone.
  • compositions can be prepared, for example, by mixing components via blending using a mechanical mixer in a tank or other similar vessel, for example.
  • Additives can generally be added at any time during mixing of the components by slowly adding one or more additives to the solvent components while mixing. Alternatively, the solvent components and any additives can be added and mixed simultaneously
  • compositions For example, methods of removing coatings from surfaces.
  • Such method can include a step of contacting a surface having one or more coatings on at least a portion of the surface with a disclosed composition.
  • Such a step can include applying the composition to a surface where the coating is desired to be removed.
  • Optional steps can also include allowing the composition to act for a certain amount of time, and the removing the composition and at least part of the coating from the surface.
  • the coating can include more than one layer (e.g., the coating can be multilayered and - for instance - could consist of up to ten layers for example [e.g. - 2, 3, 4, 5, 6, 7, 8, 9, or 10 layers]).
  • Each layer can be the same or different and, in some cases, the coating (or coating layer(s) when more than one coating layer is present) may be comprised of epoxy, latex enamel paints, alkyd paints, oil-based paints, varnish, shellac, paint, lacquer, polyurethane, primers, basecoats, clearcoats, or a combination thereof.
  • disclosed compositions can be fast-acting when removing coatings from surfaces.
  • Fast-acting compositions can remove at least a portion of the coating within 90 minutes, in some embodiments within 60 minutes, or in some embodiments within 30 minutes.
  • the surface can include wood, metal (e.g., aluminum, steel, and the like), ceramic, brick, stone, concrete, glass, plastic, or a combination thereof.
  • disclosed compositions can be particularly useful for removing paints and coatings from furniture, automobiles, boats, trains, airplanes, military vehicles, paint guns, and the like.
  • a step of contacting a disclosed composition with a coated surface can be by, for example,
  • compositions with a coating disposed on a surface can often be accompanied by changes to the coating including penetration, softening, swelling, flaking, cracking, chemical reacting, dissolution of the coating, or a combination thereof.
  • separating the coating from the surface can be, for example, by scraping, brushing, sanding, washing, pressurized spraying of gases or liquids, abrasive particles, and the like, or a combination thereof.
  • contacting the composition with the coating to be removed can be done at ambient temperatures. In some embodiments, for example when shorter contact times are desired, the composition, the coated substrate, or both can be heated, for example to a temperature of 20 to 200°C.
  • the method comprises contacting the above described composition with the surface comprising a coating disposed on at least a portion of the surface allowing the composition to act for a certain amount of time and separating at least a portion of the coating from the surface.
  • disclosed methods remove at least 50% of one layer of coating.
  • At least 50% of the one layer can be removed following application of the composition to the surface allowing the composition to act for a certain amount of time and separating at least a portion of the coating from the surface.
  • the composition is allowed to act for no more than 90 minutes before at least 50% of at least one layer of coating is removed. In some embodiments of disclosed methods the composition is allowed to act for no more than 60 minutes before at least 50% of at least one layer of coating is removed. In some embodiments of disclosed methods the composition is allowed to act for no more than 30 minutes before at least 50% of at least one layer of coating is removed.
  • the composition is allowed to act for no more than 90 minutes before at least 50% of two layers of coating is removed. In some embodiments of disclosed methods the composition is allowed to act for no more than 90 minutes before at least 50% of at least three layers of coating is removed. In some embodiments of disclosed methods the composition is allowed to act for no more than 30 minutes before at least 50% of at two layers of coating is removed. In some embodiments disclosed methods remove at least 50% of multiple layers of coatings in 30 minutes.
  • the method can optionally include repeating the contacting and
  • the method can further comprise repeating the contacting and separating one, two, three or four times.
  • the term“or” is generally employed in its sense including“and/or” unless the content clearly dictates otherwise.
  • the term“and/or” means one or all of the listed elements or a combination of any two or more of the listed elements.
  • compositions that“comprises” silver may be a composition that“consists of’ silver or that“consists essentially of’ silver.
  • composition means that the components of the composition, apparatus, system, method or the like are limited to the enumerated components and any other components that do not materially affect the basic and novel characteristic(s) of the composition, apparatus, system, method or the like.
  • Paint coupons were prepared by sanding a 4-inch by 8-inch plywood panel with 180 grit
  • sandpaper The sanding dust was removed, and the panel was painted with a water-based primer (Zinser). After 24 hours of drying time, the primer was sanded with 180 grit sandpaper and wiped with a cloth wetted with isopropyl alcohol. A layer of blue exterior oil paint (Rust Oleum) was applied, allowed to dry for 24 hours before sanding with 180 grit sandpaper and wiping with a cloth wetted with isopropyl alcohol. A layer of white exterior/interior latex paint (Rust Oleum) was applied, allowed to dry for 24 hours before sanding with 180 grit sandpaper and wiping with a cloth wetted with isopropyl alcohol.
  • blue exterior oil paint (Rust Oleum) was applied, allowed to dry for 24 hours before sanding with 180 grit sandpaper and wiping with a cloth wetted with isopropyl alcohol.
  • a layer of red exterior/interior latex paint (Rust Oleum) was applied, allowed to dry for 24 hours before sanding with 180 grit sandpaper and wiping with a cloth wetted with isopropyl alcohol.
  • a layer of yellow exterior oil paint (Rust Oleum) was applied, allowed to dry for 24 hours before sanding with 180 grit sandpaper and wiping with a cloth wetted with isopropyl alcohol. The panel was allowed to dry for 72 hours upon which it was cured for 30 days at 60°C in an incubator.
  • compositions of Examples 1-5 were prepared by adding compounds according to Table 1 below into a glass beaker. The composition was mixed using a magnetic stirrer bar for 5 minutes.
  • Example 1 22.5g butyl levulinate, 5 g propylene glycol mono methyl ether, 5 g butanol, 12.5g methyl-9-decenoate, 2.5g isopropanol and 2.5g water.
  • Example 2 Butyl Levulinate 11.2 g, butyl butyrate 2.18 g, Propylene glycol mono methyl ether
  • Example 3 Propyl acetate 15 g, Isopropanol 10 g, Dimethyl-2-Methyl Glutarate 15 g, Methyl Cinnamate 10 g.
  • Example 4 Butyl levulinate 11.2 g, Butyl lactate 13.5 g, 1,3 propanediol 0.3 g.
  • Example 5 Butyl levulinate 15.5 g, propylene carbonate 7 g, Isopropylidene glycerol 23 g.
  • Figure 1 A shows a photograph of the gasket containing Example 1 after 20 minutes but prior to scraping, after 20minutes after scraping (Figure IB), after 40 minutes after scraping (Figure 1C) and after 60 minutes after scraping ( Figure ID).
  • Figure 2A shows a photograph of the gasket containing Example 2 after 20 minutes, 40 minutes (Figure 2B) and 60 minutes after scraping (Figure 2C).
  • Figure 3 A shows a photograph of the gasket containing Example 3 after 20 minutes prior to scraping, after 20minutes after scraping (Figure 3B), and after 40 minutes after scraping ( Figure 3C).
  • Figure 4A shows a photograph of the gasket containing Example 4 after 20 minutes, 40 minutes (Figure 4B) and 60 minutes after scraping ( Figure 4C).
  • Figure 5A shows a photograph of the gasket containing Example 5 after 20 minutes, 40 minutes (Figure 5B) and 60 minutes after scraping (Figure 5C).
  • compositions and methods for removing coatings from surfaces are provided.

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  • Health & Medical Sciences (AREA)
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Abstract

L'invention concerne des procédés d'élimination d'au moins une partie d'un revêtement présent sur une surface, les procédés comprenant la mise en contact de la surface avec une composition, la composition ayant un ensemble de paramètres de solubilité de Hansen : 14 < δD < 18; 4 < δP < 7, et 8 < δH < 9.5; et l'élimination d'au moins une partie du revêtement de la surface. L'invention concerne également des compositions ayant un ensemble de paramètres de solubilité de Hansen : 14< δD < 18, 4 < δP < 7 et 8 < δH < 9.5.
PCT/US2019/067900 2018-12-31 2019-12-20 Compositions et procédés pour éliminer des revêtements de surfaces WO2020142273A1 (fr)

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IT202100031733A1 (it) * 2021-12-20 2023-06-20 Liberty Chemicals S R L Composizione solvente
WO2023131530A1 (fr) * 2022-01-06 2023-07-13 Basf Coatings Gmbh Composition de nettoyage pour prétraitement de substrats métalliques et procédé de préparation associé et application correspondante

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EP4198096A1 (fr) * 2021-12-20 2023-06-21 Liberty Chemicals S.r.l. Composition de solvant
WO2023131530A1 (fr) * 2022-01-06 2023-07-13 Basf Coatings Gmbh Composition de nettoyage pour prétraitement de substrats métalliques et procédé de préparation associé et application correspondante

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