# US 10,119,058 B2 · Heat transfer fluid additive composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,119,058 B2 - Document ID: US10119058B2 - Status: Granted - Kind: B2 - Application number: 15/443,630 - Filed: 2017-02-27 - Published: 2017-06-22 - Granted: 2018-11-06 - Earliest claimed: 2012-09-07 - Assignees: Prestone Products Corporation - Applicants: Prestone Products Corporation - Inventors: Bo Yang; Aleksei Gershun; Peter M. Woyciesjes - Web page: https://patentgrep.com/patent/US10119058B2 ## CPC - C09K 5/10: Liquid materials - C09K 5/00: Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion - C09K 5/20: Antifreeze additives therefor, e.g. for radiator liquids (for application to surfaces C09K3/18; inhibiting corrosion by liquids C23F11/00) - C23F 11/08: in other liquids - C09K 2205/102: Alcohols - C09K 2205/132: containing nitrogen - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 ## Abstract Disclosed herein is a heat transfer fluid additive composition comprising: greater than or equal to 10 weight percent (wt %) of a carboxylic acid, based on the total weight of the composition; an azole compound; and a base, wherein the base is present in an amount sufficient to obtain a pH 8-10.5 when diluted by 50 volume % with water. The heat transfer fluid additive composition can be combined with other components to form a heat transfer fluid. The heat transfer fluid can be used in a heat transfer system. ## Claims ### Claim 1 A heat transfer fluid additive composition comprising: a salt of a carboxylic acid containing 6 to 20 carbon atoms, wherein the salt of the carboxylic acid is present in a range from about 20 weight percent to about 80 weight percent based on a total weight of the heat transfer fluid additive composition; an azole compound; a base; and water in an amount from about 10 weight percent to about 40 weight percent; wherein the heat transfer fluid additive composition is free of other solvents and free of inorganic phosphate. ### Claim 2 (depends on 1) The heat transfer fluid additive composition of claim 1 further comprising an antifoam agent, a colorant, a scale inhibitor, a surfactant, a molybdate or a salt thereof, a nitrite or a salt thereof, or a combination thereof. ### Claim 3 (depends on 1) The heat transfer fluid additive composition of claim 1 wherein the composition is free of silicate. ### Claim 4 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the carboxylic acid is an aromatic carboxylic acid. ### Claim 5 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the carboxylic acid is an aliphatic carboxylic acid. ### Claim 6 (depends on 1) The heat transfer fluid additive composition of claim 1, further comprising a molybdate. ### Claim 7 (depends on 6) The heat transfer fluid additive composition of claim 6, wherein the molybdate is calcium molybdate, lithium molybdate, magnesium molybdate, or a combination thereof. ### Claim 8 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the azole compound is present in an amount of about 0.01 wt. % to about 10 wt. % of the composition. ### Claim 9 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the azole compound is present in an amount of about 0.3 wt. % to about 9 wt. % of the composition. ### Claim 10 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the azole compound is present in an amount of about 0.5 wt. % to about 8 wt. % of the composition. ### Claim 11 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the base is present in an amount sufficient to obtain a pH of about 7.5 to about 10.5 when the heat transfer additive composition is diluted by 50 vol. % with water. ### Claim 12 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the base is present in an amount sufficient to obtain a pH of about 8 to about 10.5 when the heat transfer additive composition is diluted by 50 vol. % with water. ### Claim 13 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the water is present in an amount of about 10 wt. % to about 25 wt. % of the composition. ### Claim 14 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the base is sodium hydroxide. ### Claim 15 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the azole compound is sodium tolyltriazole, benzotriazole, or a combination thereof. ### Claim 16 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the azole compound is selected from the group consisting of benzotriazole, tolyltriazole, methyl benzotriazole, butyl benzotriazole, mercaptobenzothiazole, thiazole, substituted thiazoles, imidazole, benzimidazole, substituted imidazoles, indazole, substituted indazoles, tetrazole, tetrahydrotolyltriazole, substituted tetrazoles, and a combination thereof. ### Claim 17 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the azole compound comprises a benzotriazole, wherein an alkyl group of the benzotriazole contains 2 to 20 carbon atoms. ### Claim 18 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the carboxylic acid is neodecanoic acid, 2-ethyl hexanoic acid, or a combination thereof. ### Claim 19 (depends on 1) The heat transfer fluid additive composition of claim 1, wherein the base is present in an amount of about 9 wt. % to about 12 wt. % of the composition. ### Claim 20 (depends on 1) A method of making a heat transfer fluid comprising combining the heat transfer fluid additive composition of claim 1 with water, a non-aqueous solvent, or a combination thereof. ### Claim 21 (depends on 20) The method of claim 20, wherein the heat transfer fluid additive composition is free of silicate, borate, and amines and has a nitrate content of less than 100 ppm. ### Claim 22 (depends on 20) The method of claim 20, wherein the azole compound is present in an amount of about 0.01 wt. % to about 10 wt. % of the composition. ### Claim 23 (depends on 20) The method of claim 20, wherein the azole compound is present in an amount of about 0.5 wt. % to about 8 wt. % of the composition. ### Claim 24 (depends on 20) The method of claim 20, wherein the base is present in an amount sufficient to obtain a pH of about 7.5 to about 10.5 when the heat transfer additive composition is diluted by 50 vol. % with water. ### Claim 25 (depends on 20) The method of claim 20, wherein the base is present in an amount sufficient to obtain a pH of about 8 to about 10.5 when the heat transfer additive composition is diluted by 50 vol. % with water. ### Claim 26 (depends on 20) The method of claim 20, wherein the water is present in an amount of about 10 wt. % to about 25 wt. % of the composition. ### Claim 27 (depends on 20) The method of claim 20, wherein the carboxylic acid is an aromatic carboxylic acid. ### Claim 28 (depends on 20) The method of claim 20, wherein the carboxylic acid is an aliphatic carboxylic acid. ### Claim 29 (depends on 20) The method of claim 20, wherein the heat transfer fluid additive composition further comprises a molybdate. ### Claim 30 (depends on 29) The method of claim 29, wherein the molybdate is calcium molybdate, lithium molybdate, magnesium molybdate, or a combination thereof. ### Claim 31 (depends on 20) The method of claim 20, wherein the base is sodium hydroxide. ### Claim 32 (depends on 20) The method of claim 20, wherein the non-aqueous solvent is a glycol. ### Claim 33 (depends on 32) The method of claim 32, wherein the glycol is ethylene glycol, propylene glycol, or a combination thereof. ### Claim 34 (depends on 20) The method of claim 20, wherein the azole compound is sodium tolyltriazole, benzotriazole, or a combination thereof. ### Claim 35 (depends on 20) The method of claim 20, wherein the carboxylic acid is neodecanoic acid, 2-ethyl hexanoic acid, or a combination thereof. ### Claim 36 (depends on 1) A method of making a modified heat transfer fluid comprising combining the heat transfer fluid additive composition of claim 1 with an existing heat transfer fluid to form a modified heat transfer fluid. ### Claim 37 (depends on 36) The method of claim 36, wherein the existing heat transfer fluid is not in contact with a heat transfer system. ### Claim 38 (depends on 37) The method of claim 37, wherein the existing heat transfer fluid is in contact with a heat transfer system.