Fire retardant compositions and corrosion inhibitor compositions containing a (phospho)silicate corrosion inhibitor

Abstract

The present invention relates to fire retardant compositions containing a metal-containing and silicate-based corrosion inhibitor (e.g., metal phosphosilicate corrosion inhibitors) that meet or exceed any or all corrosion requirements for firefighting compositions developed by the appropriate regulatory authorities, including U.S. Department of Agriculture, Forest Service (USFS), Specification Number 5100-304d, January 2020, including any and all amendments and updates to this Specification and / or any other regulations or requirements developed by the USFS. The present invention also relates to corrosion inhibitor compositions suitable for use in a variety of applications.

Description

Attorney Docket No. 18931B-000083-WO-POA FIRE RETARDANT COMPOSITIONS AND CORROSION INHIBITOR COMPOSITIONS CONTAINING A (PHOSPHO)SILICATE CORROSION INHIBITOR REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of and priority to U.S. Provisional Patent Application Serial No. 63 / 672,325, filed July 17, 2024, and U.S. Provisional Patent Application Serial No. 63 / 672,327, filed July 17, 2024. The entire contents of these applications are hereby incorporated by reference for all relevant purposes. FIELD OF THE INVENTION

[0002] The present invention relates to fire retardant compositions containing a metal-containing and silicate-based corrosion inhibitor (e.g., metal phosphosilicate corrosion inhibitors) that meet or exceed any or all corrosion requirements for firefighting compositions developed by the appropriate regulatory authorities, including U.S. Department of Agriculture, Forest Service (USFS), Specification Number 5100-304d, January 2020, including any and all amendments and updates to this Specification and / or any other regulations or requirements developed by the USFS. The present invention also relates to corrosion inhibitor compositions suitable for use in a variety of applications. BACKGROUND OF THE INVENTION

[0003] Often, large-scale wildfires occur in areas such as western regions of the United States, including densely populated areas, and may cause significant damage to both individuals and property. Such fires and damage may occur on an annual basis. The use of fire retardant chemicals has been known to be an effective way to prevent and combat wildfires for decades. Generally, fire retardant compositions are known to be effective for decreasing the flammability and / or combustibility of materials, including wildland vegetation such as forest and grassy materials, and for increasing the resistance of these materials to heat and flame damage. The United States Forest Service (USFS) has established standards for firefighting compositions including those containing fire retardants (e.g., long-term fire retardants), foam fire suppressants, and water enhancers. It is to be understood that use of the term “fire retardant” herein without the designation “long-term”Attorney Docket No. 18931B-000083-WO-POA does not indicate the retardant is not a long-term fire retardant as understood generally or in accordance with USFS standards.

[0004] In particular, the USFS has established that retardants, including long-term retardants should contain retardant chemicals that alter the way the fire burns, decrease the fire intensity, and / or slow the advance of the fire, even after the water they originally contained has evaporated. Different fire retardant chemicals have different properties, responses and / or reaction mechanisms in the presence of a heat or fire source. Accordingly, various fire retardant compositions have been explored to combat fire damage, including that from wildland vegetation.

[0005] Over the past decades, retardants, in particular long-term retardants have been focused on those chemicals which can convert the wildland vegetation from a substance that is flammable and, consequently, a fuel, to a chemically modified or converted substance with difficulty of igniting and providing fuel source when subjected to heat and beyond its ignition point for starting a fire. Ammonium phosphate based long-term retardants belong to this category, which perform under a condensed-phase fire retardant mechanism having a char formation model. This type of retardant undergoes thermal degradation at elevated temperature to generate pyrophosphoric acids, which can catalyze dehydration of carbohydrate materials to form an insulating char layer on the surface of the potential fuel source and reduce the release of volatile combustible gases.

[0006] Fire retardant concentrate compositions comprising mixtures of monoammonium phosphate, diammonium phosphate and / or ammonium polyphosphate for combating wildfire either directly onto flaming fuel or indirectly onto the fuel ahead of a potentially advancing fire front are known. Fire retardant compositions comprising ammonium phosphate mixtures as effective wildfire retardants with decreased corrosion to metals and decreased aquatic toxicity are also known. As indicated, various fire retardant compositions for combating wildfire are based on phosphate chemicals and have a fire retardant mechanism based on condensed-phase char formation. Such phosphate based compounds have been proven effective as fire retardant chemicals, making them useful in wildfire retardant formulations. Other fire retardant compositions are known as well, including magnesium chloride-based and magnesium sulfate-based retardants.Attorney Docket No. 18931B-000083-WO-POA

[0007] Effective fire retardants such as those described above are known. Improvements in metal corrosion for such fire retardants are being investigated. The present disclosure and inventions described there are directed to such improvements. BRIEF SUMMARY OF THE INVENTION

[0008] Briefly, therefore, the present invention is directed to fire retardant compositions comprising a fire retardant, a corrosion inhibitor component, and one or more additional components. The fire retardant is selected from the group consisting of phosphate-based retardants, carbonate salt retardants, magnesium chloride retardants, magnesium sulfate retardants, and combinations thereof; and a corrosion inhibitor component. The corrosion inhibitor component comprises a metal phosphosilicate corrosion inhibitor.

[0009] Various aspects of the present invention are directed to fire retardant compositions comprising a fire retardant comprising potassium carbonate; a corrosion inhibitor comprising a calcium sodium phosphosilicate; and one or more additional components. The fire retardant comprises from about 85 wt% to about 90 wt% of the fire retardant composition and the corrosion inhibitor comprises about 2 wt% to about 6 wt. % of the fire retardant composition.

[0010] Further aspects of the present invention are directed to corrosion inhibitor compositions described herein suitable for use in a variety of applications (e.g., protection of metal structures including through use in coating, sealing, and paint formulations).

[0011] Other objects and features will be in part apparent and in part pointed out hereinafter. DETAILED DESCRIPTION OF THE INVENTION

[0012] As noted, the compositions of the present disclosure generally contain a fire retardant component, a metal phosphosilicate corrosion inhibitor, and one or more additional components. Metal Phosphosilicate Corrosion Inhibitor

[0013] Compositions of the present invention typically include a corrosion inhibitor component that comprises, consists essentially of, or consists of a metal phosphosilicateAttorney Docket No. 18931B-000083-WO-POA corrosion inhibitor. That is, while other corrosion inhibitor components may be included in accordance with the discussion herein, in certain embodiments the metal phosphosilicate is the only corrosion inhibitor component included in the compositions of the present disclosure.

[0014] In various embodiments, the metal phosphosilicate corrosion inhibitor comprises one or more alkali metals selected from the group consisting of lithium, sodium, potassium, cesium, rubidium, and combinations thereof. In these and various other embodiments, the metal phosphosilicate corrosion inhibitor comprises an alkaline earth metal selected from the group consisting of calcium, barium, strontium, magnesium, and combinations thereof. In certain embodiments, the metal phosphosilicate corrosion inhibitor comprises a metal selected from the group consisting of aluminum, cerium, potassium, and combinations thereof.

[0015] In certain embodiments, the metal phosphosilicate corrosion inhibitor comprises calcium and sodium; calcium and cerium; calcium and aluminum; sodium and aluminum; or sodium, potassium, magnesium, and calcium.

[0016] The phosphosilicate component, or portion of the metal phosphosilicate corrosion inhibitor typically comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of at least about 1:1, at least about 2:1, at least about 3:1, at least about 4:1, at least about 5:1, at least about 6:1, at least about 7:1, at least about 8:1, at least about 9:1, or at least about 10:1. In these and various other embodiments, the phosphosilicate comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of from about 10:1 to about 1:10, from about 8:1 to about 1:8, from about 6:1 to about 1:6, or from about 4:1 to about 1:4.

[0017] In accordance with the foregoing, in various embodiments the phosphosilicate comprises from about 20 wt% to about 35 wt%, or about 25 wt% calcium oxide (CaO); from about 5 wt% to about 25 wt% sodium oxide (Na2O); from about 45 wt% to about 70 wt%, or from about 45 wt% to about 60 wt% silicon dioxide (SiO2); and from about 5 wt% to about 10 wt% phosphorus pentoxide (P2O5).

[0018] Further in accordance with the foregoing discussion, in various embodiments the metal phosphosilicate corrosion inhibitor comprises calcium silicate, calcium strontiumAttorney Docket No. 18931B-000083-WO-POA phosphosilicate, modified calcium phosphosilicate, sodium silicate, sodium metasilicate, sodium calcium phosphosilicate, potassium silicate, barium phosphosilicate, strontium phosphosilicate, zinc silicate, strontium zinc phosphosilicate, and zinc strontium calcium phosphosilicate., and combinations thereof. In certain preferred embodiments, the metal phosphosilicate corrosion inhibitor comprises sodium calcium phosphosilicate. Various such embodiments employ technical grade sodium calcium phosphosilicate as the corrosion inhibitor. Corrosion Inhibitors

[0019] Along with the metal phosphosilicate, the corrosion inhibitor component may include one or more additional corrosion inhibitors.

[0020] The corrosion inhibitor component may further comprise a molybdate corrosion inhibitor selected from anhydrous sodium molybdate, its dihydrate, or mixtures thereof, in a proportion of from about 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5% to any of about 0.05%, 0.1%, 0.2%, 0.3%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, or 2.0% by weight of the composition.

[0021] Other suitable corrosion inhibitors include azole corrosion inhibitors that may be present in a proportion of from any of about 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5% to any of about 0.05%, 0.1%, 0.2%, 0.3%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, or 2.0% by weight of the composition.

[0022] Other suitable corrosion inhibitors include calcium compounds selected from the group consisting of anhydrous calcium oxide or a hydrate thereof, anhydrous calcium hydroxide or a hydrate thereof, anhydrous calcium nitrate or a hydrate thereof, anhydrous calcium acetate or a hydrate thereof, anhydrous calcium chloride or a hydrate thereof, and combinations thereof.

[0023] Further in accordance with the present invention, additionally or alternatively, the corrosion inhibitor component may further comprise a compound selected from the group consisting of sodium dihydrogen phosphate, disodium hydrogen phosphate, trisodium phosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, tripotassium phosphate, monocalcium phosphate, and combinations thereof.Attorney Docket No. 18931B-000083-WO-POA Fire Retardant

[0024] As noted above, suitable fire retardants include those generally known in the art. These include alkali metal carbonate salts selected from the group consisting of potassium carbonate, potassium bicarbonate, sodium carbonate, sodium bicarbonate, lithium carbonate, and combinations thereof; and / or an ammonium phosphate-based fire retardant selected from the group consisting of monoammonium phosphate (MAP), diammonium phosphate (DAP), ammonium polyphosphate (APP), and combinations thereof; and / or a magnesium chloride fire retardant selected from MgCl2and magnesium chloride hydrates (MgCl2·(H2O)x, where x is 1, 2, 4, 6, 8, or 12); and / or a magnesium sulfate fire retardant selected from MgSO4and magnesium sulfate hydrates (MgSO4·(H2O)x, where x is 1, 2, 3, 4, 5, 6, 7, 9, 10 or 11).

[0025] Typically, the fire retardant and metal phosphosilicate corrosion inhibitor are present in a weight ratio of retardant to corrosion inhibitor of at least about 5:1, at least about 10:1, at least about 15:1, or at least about 20:1. In accordance with these and various other embodiments, the fire retardant and metal phosphosilicate corrosion inhibitor are present in a weight ratio of less than about 30:1, less than about 25:1, or less than about 22:1. Additional Components

[0026] Additional components that may be included in the compositions of the present invention include thickeners, pigments, dyes, opacifiers, and flow conditioners.

[0027] Suitable thickeners include xanthan gum, rhamsan gum, velan gum, diutan gum, guar gum, and mixtures thereof.

[0028] Suitable pigments and dyes include red iron oxide, brown iron oxide, titanium dioxide, and fugitive pigments and dyes. Fire Retardant Compositions / Solutions

[0029] Aspects of the present disclosure include fire retardant solutions prepared by mixing a fire retardant composition (e.g., a concentrate composition), as described anywhere herein, with water to form an aqueous solution. In certain embodiments, a homogenous solution is formed. In certain other embodiments, the water contains low levels of bacterial contamination that can impact viscosity and / or stability by consuming biopolymers. Thus,Attorney Docket No. 18931B-000083-WO-POA in certain embodiments, the water contains a biocide to prevent bacterial contamination. In certain embodiments, the solution comprises insoluble components.

[0030] In certain embodiments, the solution is prepared by combining at least 5 volumes of water per volume of liquid concentrate. In certain embodiments, the ratio of water to liquid concentrate is from about 4 volumes to about 7 volumes of water to about 1 volume of liquid concentrate (e.g., from about 5 volumes to about 7 volumes of water to about 1 volume of liquid concentrate).

[0031] In certain other embodiments, a solution of the present disclosure is prepared by combining at least about 0.5 pounds (lbs.), at least about 0.6 lbs., at least about 0.7 lbs., at least about 0.8 lbs., at least about 0.9 lbs., at least about 1.0 lb., at least about 1.5 lbs., or at least 2 lbs. of fire retardant concentrate per gallon of water.

[0032] Suitable concentrate compositions include both liquid and powder (dry) concentrate compositions.

[0033] In certain embodiments, a fire-retardant solution meets one or more of the required criteria for of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including any and all amendments.

[0034] In certain embodiments, a fire-retardant solution meets one or more of the required criteria for corrosion and / or stability of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments.

[0035] In certain embodiments, a fire-retardant solution meets all of the required criteria for corrosion of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments.

[0036] For example, various embodiments of the present invention involve fire retardant solutions that may and typically or preferably meet one or more, or all of the metal corrosion standards established in USFS Specification 5100-304d (January 7, 2020), entitled “Long-Term Retardant, Wildland Firefighting.” A wildland fire retardant solution can qualify for application for use with fixed tank helicopters when the maximum corrosion rates for 2024 T3 aluminum, 4130 steel, yellow brass and AZ-31-B magnesium are not higher than 2 milli-inch per year (MPY), 5 MPY, 5 MPY and 4 MPY, respectively. For qualification of use with fixed -wing air tankers, the maximum allowable corrosion rate of aAttorney Docket No. 18931B-000083-WO-POA wildland fire retardant solution to aluminum is 2 MPY, and maximum corrosion rates to steel and brass is 5 MPY while corrosion to magnesium is not required.

[0037] The present invention thus involves fire retardant solutions that may typically or preferably exhibit aluminum (e.g., 2024T3 aluminum) corrosion of less than about 5 MPY, less than about 4.5 MPY, less than about 4 MPY, less than about 3.5 MPY, less than about 3 MPY, less than about 2.5 MPY, less than about 2 MPY, less than about 1.5 MPY, less than about 1 MPY, or less than about 0.5 MPY.

[0038] Additionally, or alternatively, the present invention involves fire retardant solutions that may typically or preferably exhibit steel (e.g., 4130 steel) corrosion of less than about 5 MPY, less than about 4.5 MPY, less than about 4 MPY, less than about 3.5 MPY, less than about 3 MPY, less than about 2.5 MPY, less than about 2 MPY, less than about 1.5 MPY, less than about 1 MPY, or less than about 0.5 MPY.

[0039] The present invention also involves fire retardant solutions that may typically or preferably exhibit yellow brass corrosion of less than about 5 MPY, less than about 4.5 MPY, less than about 4 MPY, less than about 3.5 MPY, less than about 3 MPY, less than about 2.5 MPY, less than about 2 MPY, less than about 1.5 MPY, less than about 1 MPY, or less than about 0.5 MPY.

[0040] Further additionally or alternatively, the fire retardant solutions may typically or preferably exhibit magnesium (e.g., AZ-31-B magnesium) corrosion of 5 MPY, less than about 4.5 MPY, less than about 4 MPY, less than about 3.5 MPY, less than about 3 MPY, less than about 2.5 MPY, less than about 2 MPY, less than about 1.5 MPY, less than about 1 MPY, or less than about 0.5 MPY.

[0041] In certain embodiments, the present invention involves fire retardant compositions (e.g., fire retardant solutions and concentrates diluted to prepare fire retardant solutions) that may typically or preferably meet the applicable steel, yellow brass and magnesium corrosion standards. A pH regulating compound may be included, thereby providing a composition also meeting the applicable aluminum corrosion standards.

[0042] In certain embodiments, a fire-retardant solution meets all of the required criteria for stability of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments.Attorney Docket No. 18931B-000083-WO-POA

[0043] In certain embodiments, a fire-retardant solution meets all of the required criteria for corrosion and stability of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments.

[0044] In certain embodiments, a fire-retardant solution meets all of the required criteria of U.S. Department of Agriculture, Forest Service, Specification Number 5100- 304d, January 2020, including all amendments.

[0045] In certain embodiments, the fire-retardant solution exhibits a viscosity in the range of from about 100 cPs to about 1500 cPs, from about 100 cPa to about 1000 cps, or from about 100 cPs to about 800 cPs, or from about 100 cPs to about 300 cPs when measured in accordance with Specification 5100-304d, January 2020, including any and all amendments.

[0046] The disclosed solutions also exhibit low aquatic toxicity. For example, in certain embodiments, a solution exhibits an aquatic toxicity (LC50) in the range of from about 180 milligrams per liter to about 1500 milligrams per liter. In certain embodiments, a solution exhibits an aquatic toxicity (LC50) greater than about 180, 200, 500, 1000, 2000, or 2500 milligrams per liter. In certain embodiments, a solution exhibits an aquatic toxicity (LC50) in the range of from any of about 180, 200, 500, 750, 1000, 2000, or 2500 milligrams per liter to any of about 200, 500, 1000, 2000, 2500, or 2700 milligrams per liter (e.g., about 980 milligrams per liter).

[0047] In certain embodiments, a fire-retardant solution has a pH in the range of from about pH 4.0 or 5.0 to about pH 10.0. In certain embodiments, a fire-retardant solution has a pH in the range of from about pH 6.0 about pH 10.0. In certain embodiments, a fire- retardant solution has a pH in the range of from about pH 6.0 to about pH 10.0 (e.g., from about 6.0 to about 10.0 or from about 6.0 to about 9.5). In certain embodiments, a fire- retardant solution has a pH in the range of from about pH 9.0. to about pH 9.3. In certain embodiments, a fire-retardant solution has an alkaline pH.

[0048] Further in accordance with the present disclosure, it is to be understood that compositions of the present invention may and / or will meet and / or exceed any corrosion, stability, and / or other requirement established by the appropriate regulatory authority, including the USFS.Attorney Docket No. 18931B-000083-WO-POA

[0049] For example, in various embodiments the fire retardant composition (e.g., solution) meets one or more of the required criteria for corrosion and / or stability established by the U.S. Department of Agriculture, Forest Service (USFS); and / or meets all of the required criteria for corrosion and / or stability established by the USFS; and / or the fire retardant solution meets all of the required criteria for corrosion established by the USFS; and / or meets all of the required criteria for stability established by the USFS; and / or meets all of the required criteria for corrosion and stability established by the USFS.

[0050] In certain embodiments, visibility of the applied solution is improved, allowing firefighting forces to draw an effective chemical fire barrier using less total solution. Methods of Combatting a Wildfire

[0051] Disclosed herein are methods of combatting a wildfire by applying a fire- retardant solution described anywhere herein for the purpose of suppressing, containing, controlling, or extinguishing, etc., a wildfire. In certain embodiments, the fire-retardant solution is applied directly onto a flaming fuel. In other embodiments, the fire-retardant solution is applied indirectly, e.g., in front of or parallel to the moving fire front. The distance between the advancing fire and the retardant fire-break depends on the rate that the solution can be applied, the rate of spread of the moving fire front, and the presence or absence of a natural fuel break identified by changes in the geometry of the ground being threatened. In certain embodiments, the fire-retardant solution is applied from a ground platform such as a fire-engine. In these and certain other embodiments, the fire-retardant solution is applied from an aerial platform such as a fixed-wing aircraft or a rotary-wing aircraft. For example, in certain embodiments, the fire-retardant solution is applied from a rotary-wing aircraft such as a helicopter utilizing a bucket which is slung below the helicopter and in other embodiments the fire-retardant solution is contained within tanks mounted in or attached externally to the helicopter. In other embodiments, the fire retardant solution is applied from a mix of all of those listed vehicles or platforms. Obviously, the safety of the solution relative to aircraft corrosion and fouling of critical components must be greater when the solution is within or in contact with the aircraft.Attorney Docket No. 18931B-000083-WO-POA Additional Compositions / Features

[0052] Further in accordance with the present invention and the foregoing discussion, the compositions of the present disclosure and inventions may incorporate components or exhibit properties described in the following applications / publications, the entire contents of which are incorporated herein by reference for all relevant purposes: International Patent Application No. PCT / US2023 / 037001 entitled FIRE RETARDANT COMPOSITIONS CONTAINING A CARBONATE SALT (WO 2024 / 102391 A1) (Attorney Docket No. 18931B-000066-WO-POA); International Patent Application No. PCT / US2023 / 026314 entitled FIRE RETARDANT CONCENTRATE COMPOSITIONS CONTAINING A CARBOXYLIC ACID AND ONE OR MORE CORROSION INHIBITORS (WO 2024 / 006255 A2) (Attorney Docket No. 18931B-000047-WO-POA); International Application No. PCT / US2022 / 023339 entitled FIRE-RETARDANT COMPOSITIONS CONTAINING XANTHAN GUM AND COLLOIDAL SILICA (WO 2022 / 216621 A1) (18931B-000020-WO-POA); International Application No. PCT / US2023 / 017068 entitled MAGNESIUM CHLORIDE FIRE RETARDANT COMPOSITIONS (WO 2023 / 192576 A1) (18931B-000018-WO-POA). Fire Retardant Concentrates

[0053] Various aspects of the present invention involve fire retardant concentrates.

[0054] In certain aspects, the composition is in the form of a solid concentrate (e.g., dry concentrate, a powder concentrate, or a flowable powder concentrate).

[0055] Typically, in accordance with such embodiments, the at least one fire retardant is present in a concentration of at least about 75 wt%, at least about 80 wt%, at least about 85wt%, at least about 90 wt%, at least about 95 wt %, or above any of these lower limits and up to about 95 wt%.

[0056] Aspects of the present invention are also directed to liquid fire retardant concentrates.

[0057] Typically, in accordance with such embodiments, the at least one fire retardant is present in a concentration of less than about 95 wt%, less than about 85 wt%, less than about 80 wt%, less than about 75 wt%, less than about 70 wt%, less than about 65 wt%, less than about 60 wt%, less than about 55 wt%, less than about 50 wt%, less than about 45 wt%, or less than about 40 wt%, or below any of these upper limits and above atAttorney Docket No. 18931B-000083-WO-POA least about 25 wt%. Additionally, or alternatively, water is typically present in a concentration of at least about 20 wt%, at least about 25 wt%, at least about 30 wt%, at least about 35 wt%, at least about 40 wt%, at least about 45 wt%, at least about 50 wt%, or above any of these lower limits and below at least about 60 wt%.

[0058] Further in accordance with the foregoing, the compositions of the present disclosure include one or more of the following components in the following concentrations, proportions, etc. and in accordance with the compositions defined in the appended claims.

[0059] Fire retardant concentrates of the present invention may be in the form of solid (dry, e.g., powder) concentrates or may be liquid concentrates. Additionally, or alternatively, liquid concentrates may be prepared from solid concentrates by dilution with water. In this regard, it is to be understood that such liquid concentrates have not been diluted to such a level that would provide a fire retardant solution as discussed herein. Liquid concentrates may also be prepared by diluting the fire retardant(s) and other components included in the concentrate as described herein with water. Solid (Dry) Concentrates

[0060] Solid (e.g., dry and / or powder) concentrate compositions of the present invention typically further comprise one or more thickeners. Representative thickeners include xanthan gum, rhamsan gum, velan gum, diutan gum, guar gum, and mixtures thereof. In certain embodiments, the thickener is xanthan gum.

[0061] The thickener is typically present in a proportion of at least about 1 wt%, at least about 1.5 wt%, at least about 1.75 wt%, at least about 2 wt%, or at least about 2.5 wt%. Often, the thickener is present in a proportion of from about 1 wt% to about 8 wt%, 1.5 wt% to about 8 wt%, from about 1.75 wt% to about 8 wt%, from about 1.5 wt% to about 5 wt%, from about 1.5 wt% to about 3 wt%, from about 2 wt% to about 3 wt%, or from about 2.25 wt% to about 2.75 wt% (e.g., about 2.3 wt% or about 2.5 wt%).

[0062] The concentrates of the present disclosure further include one or more corrosion inhibitors in accordance with the foregoing discussion.

[0063] Generally, the concentrates of the present invention may be uncolored, include a pigment (e.g., iron oxide), or be colored with a fugitive pigment. A fugitive color system may be present in a concentration of from about 1 wt% to about 3.5 wt%, from about 1.5 wt% to about 3.5 wt% (e.g., about 1.7 wt%).Attorney Docket No. 18931B-000083-WO-POA

[0064] In certain aspects, the pigment or dye comprises red iron oxide, brown iron oxide, titanium dioxide or a fugitive pigment or dye. In some embodiments, the pigment or dye can comprise a fugitive color system.

[0065] In some embodiments, the fugitive color system comprises a fugitive pigment and a water insoluble opaque material (e.g., an opacifier such as zinc ferrite).

[0066] Suitable color systems are described in, for example, U.S. Serial No. 16 / 784,913 (US 2020 / 024290 A1) and U.S. Patent No, 11,142,698, the entire contents of which are incorporated herein by reference for all relevant purposes.

[0067] Typically, any dye or colorant is present in the concentrate at a concentration of from about 0.15 wt% to about 0.35 wt%, or about 0.15 wt% of the concentrate. For example, iron oxide may be present in a concentration of from about 0.15 wt% to about 1.5 wt%, or from about 0.15 wt% to about 0.35 wt%.

[0068] For example, suitable fugitive pigment color systems include those described in U.S. Patent No. 11,142,698, the entire contents of which are incorporated by reference herein for all relevant purposes.

[0069] Concentrates of the present disclosure and the foregoing discussion may be utilized to form fire retardant solutions in accordance with the foregoing discussion. Corrosion Inhibitor Compositions

[0070] Other aspects of the present invention and disclosure relate to corrosion inhibitor compositions suitable for use in a variety of applications, including various industrial applications, commercial applications, etc. Such applications include protection of metal structures including through use in coating, sealing, paint formulations, etc.

[0071] Corrosion inhibitor compositions of the present disclosure comprising a metal phosphosilicate corrosion inhibitor typically include one or more alkali metals selected from the group consisting of lithium, sodium, potassium, cesium, rubidium, and combinations thereof; and / or one or more alkaline earth metals selected from the group consisting of calcium, barium, strontium, magnesium, and combinations thereof; and / or one or more metals selected from the group consisting of aluminum, cerium, potassium, and combinations thereof.

[0072] In various aspects the metal phosphosilicate corrosion inhibitor composition comprises one or more alkali metals selected from the group consisting of lithium, sodium,Attorney Docket No. 18931B-000083-WO-POA potassium, cesium, rubidium, and combinations thereof; and one or more alkaline earth metals selected from the group consisting of calcium, barium, strontium, magnesium, and combinations thereof. For example, the corrosion inhibitor composition may comprise calcium and sodium; or sodium, potassium, magnesium, and calcium.

[0073] In various other aspects of the present invention, the metal phosphosilicate corrosion inhibitor composition may comprise one or more alkali metals selected from the group consisting of lithium, sodium, potassium, cesium, rubidium, and combinations thereof; and one or more metals selected from the group consisting of aluminum, cerium, potassium, and combinations thereof. For example, the metal phosphosilicate corrosion inhibitor may comprise sodium and aluminum.

[0074] In various other aspects of the present invention, the metal phosphosilicate corrosion inhibitor comprises one or more alkaline earth metals selected from the group consisting of calcium, barium, strontium, magnesium, and combinations thereof; and one or more metals selected from the group consisting of aluminum, cerium, potassium, and combinations thereof.

[0075] In certain aspects of the present invention, the metal phosphosilicate corrosion inhibitor comprises sodium, potassium, magnesium, and calcium.

[0076] In accordance with these and various aspects of the present invention, the metal phosphosilicate comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of at least about 1:1, at least about 2:1, at least about 3:1, at least about 4:1, at least about 5:1, at least about 6:1, at least about 7:1, at least about 8:1, at least about 9:1, or at least about 10:1.

[0077] The metal phosphosilicate corrosion inhibitor may comprise silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of from about 10:1 to about 1:10, from about 8:1 to about 1:8, from about 6:1 to about 1:6, or from about 4:1 to about 1:4.

[0078] In various aspects of the present invention, the corrosion inhibitor composition comprises a metal phosphosilicate corrosion inhibitor comprises: from about 20 wt% to about 35 wt%, or about 25 wt% calcium oxide (CaO); from about 5 wt% to about 25 wt% sodium oxide (Na2O); from about 45 wt% to about 70 wt%, or from about 45 wt% toAttorney Docket No. 18931B-000083-WO-POA about 60 wt% silicon dioxide (SiO2); and from about 5 wt% to about 10 wt% phosphorus pentoxide (P2O5).

[0079] In various other aspects the corrosion inhibitor composition comprises a metal phosphosilicate corrosion inhibitor, wherein the metal phosphosilicate corrosion inhibitor comprises calcium silicate, calcium strontium phosphosilicate, modified calcium phosphosilicate, sodium silicate, sodium metasilicate, sodium calcium phosphosilicate, potassium silicate, barium phosphosilicate, strontium phosphosilicate, zinc silicate, and zinc strontium calcium phosphosilicate., and combinations thereof. For example, the metal phosphosilicate corrosion inhibitor may comprise sodium calcium phosphosilicate. Various such embodiments employ technical grade sodium calcium phosphosilicate as the corrosion inhibitor.

[0080] Having described the invention in detail, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims.

[0081] When introducing elements of the present invention or the preferred embodiments(s) thereof, the articles "a", "an", "the" and "said" are intended to mean that there are one or more of the elements. The terms "comprising", "including" and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.

[0082] In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

[0083] As various changes could be made in the above without departing from the scope of the invention, it is intended that all matter contained in the above description shall be interpreted as illustrative and not in a limiting sense. EXAMPLES

[0084] The following non-limiting examples are provided to further illustrate the present invention. Example 1

[0085] A fire retardant composition was prepared with a metal phosphosilicate (sodium calcium phosphosilicate) as the corrosion inhibitor. Detailed composition information is shown in the following table.Attorney Docket No. 18931B-000083-WO-POA Diluted liquid fire retardant composition of Example 1Fire retardant 5-15% Biopolymer thickener 0.1-1.0% Fugitive pigment 0.1-1.0% Opacifier 0.01-0.05% Flow conditioner 0.05-0.5% Metal phosphosilicate corrosion inhibitor 0.01-1.0%Molybdate corrosion inhibitor 0.01-0.05% Water 80-95% Total weight of fire retardant composition 100%Example 2

[0086] The following table provides compositional information for both a concentrated formulation and a diluted formulation (i.e., solution) in accordance with the present invention. Formulation Di tin 1 1Example 3

[0087] The following Example details compositions prepared using an ammonium phosphate-based fire retardant composition standard containing different concentrations ofAttorney Docket No. 18931B-000083-WO-POA calcium sodium phosphosilicate (CSPS) in the concentrate formulation (0.10 wt% or 1.0 wt%). The following information provides composition and aluminum corrosion testing performance of a composition not containing CSPS and the two CSPS compositions, for both concentrate compositions and diluted compositions. The diluted compositions were prepared by mixing the concentrate compositions with water at a mix ratio (water : concentrate) of 4.6:1 (0.1 wt% CSPS) or 4.4:1 (1.0 wt% CSPS).

[0088] As shown, the CSPS compositions exhibited similar physical (e.g., rheological) properties and at least equivalent aluminum corrosion performance as compared to the composition not containing CSPS.ETA / Tl Cu o pHR T 2 S 2 V 2 VCCmrr Ie4 p 4 is 4 i h SPi o (mh e hn B p o cifo co h so co ar S,u sim o[n00rer uricur sit ur sit ac0.[09ix0)atu]rSep GV yi c V y ti c er1%08°erCcia sfv cPscP iiosos zaC 9S ]Tit si pisi pi tiP Plonc6. 1 1 1 1 2 2 troA t3 1 9 .0 .0 8 2 22 22 di 0l .0 atmetp or6. [en0t 9 .2 .0 63 5 7 3 5 25ut2e % [Cos nieymBrat [B C ],tioDp] eyco ]SmPandns ocpS 0f ko. es2ort Ni3thtio6 4 1 1C% eo.n. 1 2 1 2 1 [s176.35.0.29.2 03071300 CcoS 1.0Cst1.8 94] nc.Pa8S%SPnSd9a3r11. [ d8Cmp] 6. 1 1 1 1 3i dB- Clu [A 0041 9 . 2 2 2 [0 .0 0 6 7 5Cdi S 0.2te]00y4 .4 .0 6 3 7 9 37 62] lutePS 3% conmot83pco o-WsnittiaO -oinniPO[ nC gA ].Attorney Docket No. 18931B-000083-WO-POA

[0091] Unless otherwise indicated, the corrosion inhibition tests described herein were conducted in accordance with USFS Specification 5100-304d (January 7, 2020), based on 90-day immersion weight loss tests. Briefly, nominally 1 inch by 4 inch by 0.125 inch metal testing coupons were measured to determine their precise dimension and engraved with a unique identifier. The coupons were then degreased, acid washed to remove oxidation films, rinsed with distilled water, dried, and weighed. Each testing coupon was then immersed either fully or partially by configuration in a glass jar containing either 800 ml or 400 ml fire-retardant composition. The glass jars were placed in 70°F room temperature environment or an incubator at temperature of 120°F. USFS Specification 5100-304d includes four testing conditions, i.e., room temperature total immersion (RTT), room temperature partial immersion (RTP), elevated temperature total immersion (ETT), and elevated temperature partial immersion (ETP). The testing results provided above are for ETT conditions. Duplicates were tested for each testing condition. After 90 days incubation, the testing coupons were removed from the testing jars and subjected to acid washing, distilled water rinsing and drying before weighing. The weight change of each testing coupon before and after 90-day incubation test was used to calculate the corrosion rate which is extrapolated from 90 days to be expressed in mils per year (mpy). EMBODIMENTS

[0092] For additional illustration, further and preferred embodiments of the present invention are set forth below.

[0093] Embodiment 1 is directed to a fire retardant composition, the composition comprising a fire retardant, a corrosion inhibitor component, and one or more additional components, wherein the corrosion inhibitor component comprises a metal phosphosilicate corrosion inhibitor.

[0094] Embodiment 2 is directed to the composition of Embodiment 1, wherein the corrosion inhibitor component consists essentially of or consists of the metal phosphosilicate corrosion inhibitor component.

[0095] Embodiment 3 is directed to the composition of Embodiment 1 or 2, wherein the fire retardant is selected from the group consisting of phosphate-based retardants,Attorney Docket No. 18931B-000083-WO-POA carbonate salt retardants, magnesium chloride retardants, magnesium sulfate retardants, and combinations thereof.

[0096] Embodiment 4 is directed to the composition of any one of Embodiments 1 to 3, wherein the metal phosphosilicate corrosion inhibitor comprises one or more alkali metals selected from the group consisting of lithium, sodium, potassium, cesium, rubidium, and combinations thereof.

[0097] Embodiment 5 is directed to the composition of any one of Embodiments 1 to 4, wherein the metal phosphosilicate corrosion inhibitor comprises an alkaline earth metal selected from the group consisting of calcium, barium, strontium, magnesium, and combinations thereof.

[0098] Embodiment 6 is directed to the composition of any one of Embodiments 1 to 5, wherein the metal phosphosilicate corrosion inhibitor comprises a metal selected from the group consisting of aluminum, cerium, potassium, and combinations thereof.

[0099] Embodiment 7 is directed to the composition of any one of Embodiments 1 to 6, wherein the metal phosphosilicate corrosion inhibitor comprises: calcium and sodium; calcium and cerium; calcium and aluminum; sodium and aluminum; or sodium, potassium, magnesium, and calcium.

[0100] Embodiment 8 is directed to the composition of any of one of Embodiments 1 to 7, wherein the metal phosphosilicate comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of at least about 1:1, at least about 2:1, at least about 3:1, at least about 4:1, at least about 5:1, at least about 6:1, at least about 7:1, at least about 8:1, at least about 9:1, or at least about 10:1.

[0101] Embodiment 9 is directed to the composition of any one of Embodiments 1 to 7, wherein the metal phosphosilicate comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of from about 10:1 to about 1:10, from about 8:1 to about 1:8, from about 6:1 to about 1:6, or from about 4:1 to about 1:4.

[0102] Embodiment 10 is directed to the composition of any one of Embodiments 1 to 7, wherein the metal phosphosilicate comprises: from about 20 wt% to about 35 wt%, or about 25 wt% calcium oxide (CaO); from about 5 wt% to about 25 wt%Attorney Docket No. 18931B-000083-WO-POA sodium oxide (Na2O); from about 45 wt% to about 70 wt%, or from about 45 wt% to about 60 wt% silicon dioxide (SiO2); and from about 5 wt% to about 10 wt% phosphorus pentoxide (P2O5).

[0103] Embodiment 11 is directed to the composition of any of Embodiments 1 to 6, wherein the metal phosphosilicate corrosion inhibitor comprises calcium silicate, calcium strontium phosphosilicate, modified calcium phosphosilicate, sodium silicate, sodium metasilicate, sodium calcium phosphosilicate, potassium silicate, barium phosphosilicate, strontium phosphosilicate, zinc silicate, strontium zinc phosphosilicate, and zinc strontium calcium phosphosilicate., and combinations thereof.

[0104] Embodiment 12 is directed to the composition of Embodiment 1, wherein the metal phosphosilicate corrosion inhibitor comprises sodium calcium phosphosilicate.

[0105] Embodiment 13 is directed to the composition of any one of Embodiments 1 to 12, wherein the fire retardant comprises at least about 75 wt%, at least about 77 wt%, at least about 80 wt%, at least about 82 wt%, at least about 85 wt%, at least about 87 wt%, or at least about 90 wt% of the fire retardant composition.

[0106] Embodiment 14 is directed to composition of any one of Embodiments 1 to 13, wherein the corrosion inhibitor comprises at least about 1 wt%, at least about 2 wt%, at least about 3 wt%, at least about 4 wt% or at least about 5 wt% of the fire retardant composition.

[0107] Embodiment 15 is directed to the composition of any one of Embodiments 1 to 14, further comprising a pigment, dye, opacifier, or combinations thereof.

[0108] Embodiment 16 is directed to the composition of Embodiment 15, wherein the pigment or dye is selected from the group consisting of red iron oxide, brown iron oxide, titanium dioxide, a fugitive pigment or die, and combinations thereof.

[0109] Embodiment 17 is directed to the composition of any one of claims 1 to 16, wherein the fire retardant comprises: an alkali metal carbonate salt selected from the group consisting of potassium carbonate, potassium bicarbonate, sodium carbonate, sodium bicarbonate, lithium carbonate, and combinations thereof; and / or an ammonium phosphate- based fire retardant selected from the group consisting of monoammonium phosphate (MAP), diammonium phosphate (DAP), ammonium polyphosphate (APP), andAttorney Docket No. 18931B-000083-WO-POA combinations thereof; and / or a magnesium chloride fire retardant selected from MgCl2and magnesium chloride hydrates (MgCl2·(H2O)x, where x is 1, 2, 4, 6, 8, or 12); and / or a magnesium sulfate fire retardant selected from MgSO4and magnesium sulfate hydrates (MgSO4·(H2O)x, where x is 1, 2, 3, 4, 5, 6, 7, 9, 10 or 11).

[0110] Embodiment 18 is directed to the composition of Embodiment 17, wherein the fire retardant and metal phosphosilicate corrosion inhibitor are present in a weight ratio of retardant to corrosion inhibitor of at least about 5:1, at least about 10:1, at least about 15:1, or at least about 20:1.

[0111] Embodiment 19 is directed to the composition of Embodiment 18, wherein the fire retardant and metal phosphosilicate corrosion inhibitor are present in a weight ratio of less than about 30:1, less than about 25:1, or less than about 22:1.

[0112] Embodiment 20 is directed to the composition of any one of Embodiments 1 to 19, wherein the corrosion inhibitor component further comprises a molybdate corrosion inhibitor selected from anhydrous sodium molybdate, its dihydrate, or mixtures thereof, in a proportion of from about 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5% to any of about 0.05%, 0.1%, 0.2%, 0.3%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, or 2.0% by weight of the composition.

[0113] Embodiment 21 is directed to the composition of any one of Embodiments 1 to 20, wherein the corrosion inhibitor component further comprises an azole corrosion inhibitor in a proportion of from any of about 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5% to any of about 0.05%, 0.1%, 0.2%, 0.3%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, or 2.0% by weight of the composition.

[0114] Embodiment 22 is directed to the composition of any one of Embodiments 1 to 21, wherein the corrosion inhibitor component further comprises a calcium compound selected from the group consisting of anhydrous calcium oxide or a hydrate thereof, anhydrous calcium hydroxide or a hydrate thereof, anhydrous calcium nitrate or a hydrate thereof, anhydrous calcium acetate or a hydrate thereof, anhydrous calcium chloride or a hydrate thereof, and combinations thereof.

[0115] Embodiment 23 is directed to the composition of any one of Embodiments 1 to 22, wherein the corrosion inhibitor component further comprises a compound selected from the group consisting of sodium dihydrogen phosphate, disodiumAttorney Docket No. 18931B-000083-WO-POA hydrogen phosphate, trisodium phosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, tripotassium phosphate, monocalcium phosphate, and combinations thereof.

[0116] Embodiment 24 is directed to the composition of any one of Embodiments 1 to 23, wherein the composition further comprises a thickener selected from the group consisting of xanthan gum, rhamsan gum, velan gum, diutan gum, guar gum, and mixtures thereof.

[0117] Embodiment 25 is directed to the compositions of any one of Embodiments 1 to 24, wherein the composition comprises a pigment or dye selected from the group consisting of red iron oxide, brown iron oxide, titanium dioxide, and fugitive pigments and dyes.

[0118] Embodiment 26 is directed to the composition of any one of Embodiments 1 to 25, wherein the composition is in the form of a fire retardant solution and: the fire retardant solution exhibits an aluminum corrosion rate equal to or less than 2.0 milli-inches or less than 1.0 milli-inches per year; and / or the fire retardant solution exhibits a mild steel corrosion rate equal to or less than 5.0 milli-inches per year; and / or the fire retardant solution exhibits a brass corrosion rate equal to or less than 5.0 milli-inches per year; and / or the fire retardant solution exhibits two or more of the above-described corrosion rates for magnesium, aluminum, mild steel and / or brass; and / or the fire retardant solution meets one or more of the required criteria for of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including any and all amendments; and / or the fire retardant solution meets one or more of the required criteria for corrosion and / or stability of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments; and / or the fire retardant solution meets all of the required criteria for corrosion of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments; and / or the fire retardant solution meets all of the required criteria for stability of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments; and / or the fire retardant solution meets all of the required criteria for corrosion and stability of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments; and / or the fire retardantAttorney Docket No. 18931B-000083-WO-POA solution meets all of the required criteria of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments; and / or the fire retardant solution exhibits a viscosity in the range of from about 100 cPs to about 1500 cPs, from about 100 cPa to about 1000 cps, or from about 100 cPs to about 800 cPs, or from about 100 cPs to about 300 cPs when measured in accordance with Specification 5100-304d, January 2020, including any and all amendments; and / or the fire retardant solution exhibits an aquatic toxicity (LC50) in the range of from about 180 milligrams per liter to about 1500 milligrams per liter, an aquatic toxicity (LC50) greater than about 180, 200, 500, 1000, 2000, or 2500 milligrams per liter, or an aquatic toxicity (LC50) in the range of from any of about 180, 200, 500, 750, 1000, 2000, or 2500 milligrams per liter to any of about 200, 500, 1000, 2000, 2500, or 2700 milligrams per liter (e.g., about 980 milligrams per liter).

[0119] Embodiment 27 is directed to the composition of any one of Embodiments 1 to 26, wherein the composition is in the form of a fire retardant solution and: the fire retardant solution meets one or more of the required criteria for corrosion and / or stability established by the U.S. Department of Agriculture, Forest Service (USFS); and / or the fire retardant solution meets all of the required criteria for corrosion and / or stability established by the USFS; and / or the fire retardant solution meets all of the required criteria for corrosion established by the USFS; and / or the fire retardant solution meets all of the required criteria for stability established by the USFS; and / or the fire retardant solution meets all of the required criteria for corrosion and stability established by the USFS.

[0120] Embodiment 28 is directed to the composition of any one of Embodiments 1 to 27, wherein the composition is in the form of a fire retardant solution and the fire retardant solution exhibits a viscosity in the range of from about 100 cPs to about 1500 cPs, from about 100 cPa to about 1000 cps, or from about 100 cPs to about 800 cPs, or from about 100 cPs to about 300 cPs.

[0121] Embodiment 29 is directed to a fire retardant composition, the composition comprising: a fire retardant comprising potassium carbonate; a corrosion inhibitor comprising a calcium sodium phosphosilicate; and one or more additional components, wherein the fire retardant comprises from about 85 wt% to about 90 wt% of the fire retardant composition and the corrosion inhibitor comprises about 2 wt% to about 6 wt. % of the fire retardant composition.Attorney Docket No. 18931B-000083-WO-POA

[0122] Embodiment 30 is directed to a corrosion inhibitor composition comprising a metal phosphosilicate corrosion inhibitor, wherein the metal phosphosilicate corrosion inhibitor comprises: one or more alkali metals selected from the group consisting of lithium, sodium, potassium, cesium, rubidium, and combinations thereof; and one or more alkaline earth metals selected from the group consisting of calcium, barium, strontium, magnesium, and combinations thereof.

[0123] Embodiment 31 is directed to the composition of Embodiment 30, wherein the metal phosphosilicate corrosion inhibitor comprises: calcium and sodium; or sodium, potassium, magnesium, and calcium.

[0124] Embodiment 32 is directed to a corrosion inhibitor composition comprising a metal phosphosilicate corrosion inhibitor, wherein the metal phosphosilicate corrosion inhibitor comprises: one or more alkali metals selected from the group consisting of lithium, sodium, potassium, cesium, rubidium, and combinations thereof; and one or more metals selected from the group consisting of aluminum, cerium, potassium, and combinations thereof.

[0125] Embodiment 33 is directed to the composition of Embodiment 32, wherein the metal phosphosilicate corrosion inhibitor comprises: sodium and aluminum.

[0126] Embodiment 34 is directed to a corrosion inhibitor composition comprising a metal phosphosilicate corrosion inhibitor, wherein the metal phosphosilicate corrosion inhibitor comprises: one or more alkaline earth metals selected from the group consisting of calcium, barium, strontium, magnesium, and combinations thereof; and one or more metals selected from the group consisting of aluminum, cerium, potassium, and combinations thereof.

[0127] Embodiment 35 is directed to a corrosion inhibitor composition comprising a metal phosphosilicate corrosion inhibitor, wherein the metal phosphosilicate corrosion inhibitor comprises sodium, potassium, magnesium, and calcium.

[0128] Embodiment 36 is directed to the composition of any of one of Embodiments 30 to 35, wherein the metal phosphosilicate comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of at least about 1:1, at least about 2:1, at least about 3:1, at least about 4:1, atAttorney Docket No. 18931B-000083-WO-POA least about 5:1, at least about 6:1, at least about 7:1, at least about 8:1, at least about 9:1, or at least about 10:1.

[0129] Embodiment 37 is directed to the composition of any one of Embodiments 30 to 35, wherein the metal phosphosilicate comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of from about 10:1 to about 1:10, from about 8:1 to about 1:8, from about 6:1 to about 1:6, or from about 4:1 to about 1:4.

[0130] Embodiment 38 is directed to a corrosion inhibitor composition comprising a metal phosphosilicate corrosion inhibitor, wherein the metal phosphosilicate corrosion inhibitor comprises: from about 20 wt% to about 35 wt%, or about 25 wt% calcium oxide (CaO); from about 5 wt% to about 25 wt% sodium oxide (Na2O); from about 45 wt% to about 70 wt%, or from about 45 wt% to about 60 wt% silicon dioxide (SiO2); and from about 5 wt% to about 10 wt% phosphorus pentoxide (P2O5).

[0131] Embodiment 39 is directed to the composition of Embodiment 38, wherein the metal phosphosilicate comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of at least about 1:1, at least about 2:1, at least about 3:1, at least about 4:1, at least about 5:1, at least about 6:1, at least about 7:1, at least about 8:1, at least about 9:1, or at least about 10:1.

[0132] Embodiment 40 is directed to the composition of Embodiment 38, wherein the metal phosphosilicate comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of from about 10:1 to about 1:10, from about 8:1 to about 1:8, from about 6:1 to about 1:6, or from about 4:1 to about 1:4.

[0133] Embodiment 41 is directed to a corrosion inhibitor composition comprising a metal phosphosilicate corrosion inhibitor, wherein the metal phosphosilicate corrosion inhibitor comprises calcium silicate, calcium strontium phosphosilicate, modified calcium phosphosilicate, sodium silicate, sodium metasilicate, sodium calcium phosphosilicate, potassium silicate, barium phosphosilicate, strontium phosphosilicate, zinc silicate, and zinc strontium calcium phosphosilicate., and combinations thereof.Attorney Docket No. 18931B-000083-WO-POA

[0134] Embodiment 42 is directed to the composition of Embodiment 41, wherein the metal phosphosilicate corrosion inhibitor comprises sodium calcium phosphosilicate.

Claims

Attorney Docket No. 18931B-000083-WO-POA CLAIMS:

1. A fire retardant composition, the composition comprising a fire retardant, a corrosion inhibitor component, and one or more additional components, wherein the corrosion inhibitor component comprises a metal phosphosilicate corrosion inhibitor.

2. The composition of claim 1, wherein the corrosion inhibitor component consists essentially of or consists of the metal phosphosilicate corrosion inhibitor component.

3. The composition of claim 1, wherein the fire retardant is selected from the group consisting of phosphate-based retardants, carbonate salt retardants, magnesium chloride retardants, magnesium sulfate retardants, and combinations thereof.

4. The composition of claim 1, wherein the metal phosphosilicate corrosion inhibitor comprises one or more alkali metals selected from the group consisting of lithium, sodium, potassium, cesium, rubidium, and combinations thereof.

5. The composition of claim 1, wherein the metal phosphosilicate corrosion inhibitor comprises an alkaline earth metal selected from the group consisting of calcium, barium, strontium, magnesium, and combinations thereof.

6. The composition of claim 1, wherein the metal phosphosilicate corrosion inhibitor comprises a metal selected from the group consisting of aluminum, cerium, potassium, and combinations thereof.

7. The composition of claim 1, wherein the metal phosphosilicate corrosion inhibitor comprises: calcium and sodium; calcium and cerium; calcium and aluminum; sodium and aluminum; or sodium, potassium, magnesium, and calcium.Attorney Docket No. 18931B-000083-WO-POA 8. The composition of claim 1, wherein the metal phosphosilicate comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of at least about 1:

1.

9. The composition of claim 1, wherein the metal phosphosilicate comprises silicon dioxide (SiO2) and phosphorus pentoxide (P2O5), in a weight ratio of silicon dioxide to phosphorus pentoxide of from about 10:1 to about 1:

10.

10. The composition of claim 1, wherein the metal phosphosilicate comprises: from about 20 wt% to about 35 wt%, or about 25 wt% calcium oxide (CaO); from about 5 wt% to about 25 wt% sodium oxide (Na2O); from about 45 wt% to about 70 wt%, or from about 45 wt% to about 60 wt% silicon dioxide (SiO2); and from about 5 wt% to about 10 wt% phosphorus pentoxide (P2O5).

11. The composition of claim 1, wherein the metal phosphosilicate corrosion inhibitor comprises calcium silicate, calcium strontium phosphosilicate, modified calcium phosphosilicate, sodium silicate, sodium metasilicate, sodium calcium phosphosilicate, potassium silicate, barium phosphosilicate, strontium phosphosilicate, zinc silicate, strontium zinc phosphosilicate, and zinc strontium calcium phosphosilicate., and combinations thereof.

12. The composition of claim 1, wherein the metal phosphosilicate corrosion inhibitor comprises sodium calcium phosphosilicate.

13. The composition of claim 1, wherein the fire retardant comprises at least about 75 wt% of the fire retardant composition.

14. The composition of claim 1, wherein the corrosion inhibitor comprises at least about 1 wt% of the fire retardant composition.Attorney Docket No. 18931B-000083-WO-POA 15. The composition of claim 1, further comprising a pigment, dye, opacifier, or combinations thereof.

16. The composition of claim 15, wherein the pigment or dye is selected from the group consisting of red iron oxide, brown iron oxide, titanium dioxide, a fugitive pigment or die, and combinations thereof.

17. The composition of claim 1, wherein the fire retardant comprises: an alkali metal carbonate salt selected from the group consisting of potassium carbonate, potassium bicarbonate, sodium carbonate, sodium bicarbonate, lithium carbonate, and combinations thereof; and / or an ammonium phosphate-based fire retardant selected from the group consisting of monoammonium phosphate (MAP), diammonium phosphate (DAP), ammonium polyphosphate (APP), and combinations thereof; and / or a magnesium chloride fire retardant selected from MgCl2and magnesium chloride hydrates (MgCl2·(H2O)x, where x is 1, 2, 4, 6, 8, or 12); and / or a magnesium sulfate fire retardant selected from MgSO4and magnesium sulfate hydrates (MgSO4·(H2O)x, where x is 1, 2, 3, 4, 5, 6, 7, 9, 10 or 11).

18. The composition of claim 17, wherein the fire retardant and metal phosphosilicate corrosion inhibitor are present in a weight ratio of retardant to corrosion inhibitor of at least about 5:

1.

19. The composition of claim 18, wherein the fire retardant and metal phosphosilicate corrosion inhibitor are present in a weight ratio of less than about 30:

1.

20. The composition of claim 1, wherein the corrosion inhibitor component further comprises a molybdate corrosion inhibitor selected from anhydrous sodium molybdate, its dihydrate, or mixtures thereof, in a proportion of from about 0.01% to 2.0% by weight of the composition.Attorney Docket No. 18931B-000083-WO-POA 21. The composition of claim 1, wherein the corrosion inhibitor component further comprises an azole corrosion inhibitor in a proportion of from any of about 0.01% to 2.0% by weight of the composition.

22. The composition of claim 1, wherein the corrosion inhibitor component further comprises a calcium compound selected from the group consisting of anhydrous calcium oxide or a hydrate thereof, anhydrous calcium hydroxide or a hydrate thereof, anhydrous calcium nitrate or a hydrate thereof, anhydrous calcium acetate or a hydrate thereof, anhydrous calcium chloride or a hydrate thereof, and combinations thereof.

23. The composition of claim 1, wherein the corrosion inhibitor component further comprises a compound selected from the group consisting of sodium dihydrogen phosphate, disodium hydrogen phosphate, trisodium phosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, tripotassium phosphate, monocalcium phosphate, and combinations thereof.

24. The composition of claim 1, wherein the composition further comprises a thickener selected from the group consisting of xanthan gum, rhamsan gum, velan gum, diutan gum, guar gum, and mixtures thereof.

25. The compositions of claim 1, wherein the composition comprises a pigment or dye selected from the group consisting of red iron oxide, brown iron oxide, titanium dioxide, and fugitive pigments and dyes.

26. The composition of claim 1, wherein the composition is in the form of a fire retardant solution and: the fire retardant solution exhibits an aluminum corrosion rate equal to or less than 2.0 milli-inches or less than 1.0 milli-inches per year; and / or the fire retardant solution exhibits a mild steel corrosion rate equal to or less than 5.0 milli-inches per year; and / orAttorney Docket No. 18931B-000083-WO-POA the fire retardant solution exhibits a brass corrosion rate equal to or less than 5.0 milli-inches per year; and / or the fire retardant solution exhibits two or more of the above-described corrosion rates for magnesium, aluminum, mild steel and / or brass; and / or the fire retardant solution meets one or more of the required criteria for of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including any and all amendments; and / or the fire retardant solution meets one or more of the required criteria for corrosion and / or stability of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments; and / or the fire retardant solution meets all of the required criteria for corrosion of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments; and / or the fire retardant solution meets all of the required criteria for stability of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments; and / or the fire retardant solution meets all of the required criteria for corrosion and stability of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments; and / or the fire retardant solution meets all of the required criteria of U.S. Department of Agriculture, Forest Service, Specification Number 5100-304d, January 2020, including all amendments; and / or the fire retardant solution exhibits a viscosity in the range of from about 100 cPs to about 1500 cPs, from about 100 cPa to about 1000 cps, or from about 100 cPs to about 800 cPs, or from about 100 cPs to about 300 cPs when measured in accordance with Specification 5100-304d, January 2020, including any and all amendments; and / or the fire retardant solution exhibits an aquatic toxicity (LC50) in the range of from about 180 milligrams per liter to about 1500 milligrams per liter, an aquatic toxicity (LC50) greater than about 180, 200, 500, 1000, 2000, or 2500 milligrams per liter, or an aquatic toxicity (LC50) in the range of from any of about 180, 200, 500, 750, 1000, 2000, or 2500Attorney Docket No. 18931B-000083-WO-POA milligrams per liter to any of about 200, 500, 1000, 2000, 2500, or 2700 milligrams per liter (e.g., about 980 milligrams per liter).

27. The composition of claim 1, wherein the composition is in the form of a fire retardant solution and: the fire retardant solution meets one or more of the required criteria for corrosion and / or stability established by the U.S. Department of Agriculture, Forest Service (USFS); and / or the fire retardant solution meets all of the required criteria for corrosion and / or stability established by the USFS; and / or the fire retardant solution meets all of the required criteria for corrosion established by the USFS; and / or the fire retardant solution meets all of the required criteria for stability established by the USFS; and / or the fire retardant solution meets all of the required criteria for corrosion and stability established by the USFS.

28. The composition of claim 1, wherein the composition is in the form of a fire retardant solution and the fire retardant solution exhibits a viscosity in the range of from about 100 cPs to about 1500 cPs, from about 100 cPa to about 1000 cps, or from about 100 cPs to about 800 cPs, or from about 100 cPs to about 300 cPs.

29. A fire retardant composition, the composition comprising: a fire retardant comprising potassium carbonate; a corrosion inhibitor comprising a calcium sodium phosphosilicate; and one or more additional components, wherein the fire retardant comprises from about 85 wt% to about 90 wt% of the fire retardant composition and the corrosion inhibitor comprises about 2 wt% to about 6 wt. % of the fire retardant composition.

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