# US 11,078,418 B2 · Corrosion inhibitors for fuels and lubricants > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,418 B2 - Document ID: US11078418B2 - Status: Granted - Kind: B2 - Application number: 16/313,751 - Filed: 2017-06-27 - Published: 2020-10-01 - Granted: 2021-08-03 - Earliest claimed: 2016-07-05 - Assignees: BASF SE - Applicants: BASF SE - Inventors: Jochen Mezger; Szilard Csihony - Web page: https://patentgrep.com/patent/US11078418B2 ## CPC - C09K 15/06: containing oxygen - C10M 129/42: polycarboxylic - C08F 8/46: Reaction with unsaturated dicarboxylic acids or anhydrides thereof, e.g. maleinisation - C10L 1/1883: {polycarboxylic acid} - C10L 1/195: obtained by reactions involving only carbon-to-carbon unsaturated bonds - C10L 1/198: obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds {homo- or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon to carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid} - C10L 10/04: for minimising corrosion or incrustation - C10M 145/16: polycarboxylic - C10L 2200/0423: Gasoline - C10L 2250/04: Additive or component is a polymer - C10L 2270/023: for gasoline engines - C10M 2207/127: polycarboxylic - C10M 2209/086: polycarboxylic, e.g. maleic acid - C10N 2020/04: Molecular weight; Molecular weight distribution - C10N 2030/12: Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives - C10N 2030/66: {Hydrolytic stability} - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS - C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS ## Abstract The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants. ## Claims ### Claim 1 A process of reducing corrosion on a surface comprising iron, steel, copper, or a copper alloy, the process comprising: contacting the surface with a corrosion inhibitor in the presence of sodium, potassium, magnesium, calcium, and/or zinc ions, wherein the corrosion inhibitor comprises a reaction product of polyisobutene comprising free acid groups, the reaction product comprising, in reacted form: (A) a polyisobutene having a number-average molecular weight Mn in a range of from 200 to 10000 and (B) an α,β-unsaturated monomer that is a monocarboxylic acid, dicarboxylic acid, monoalkyl ester, dialkyl ester, or anhydride, in a stoichiometric ratio of more than one equivalent of the α,β-unsaturated monomer (B) per reactive double bond in the polyisobutene (A), wherein the reaction product has a bismaleation level in a range of from at least 12% to 40%, and wherein, when the monomer (B) comprises the monoalkyl ester and/or the dialkyl ester, at least 10% of the ester groups present in the reaction product are in hydrolyzed form, and/or wherein, when the monomer (B) comprises the anhydride, at least 10% of the anhydride groups present in the reaction product are in hydrolyzed form. ### Claim 2 (depends on 1) The process of claim 1, wherein the polyisobutene (A) has a number-average molecular weight Mn of 500 to 2500. ### Claim 3 (depends on 1) The process of claim 1, wherein the monomer (B) is selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, ethylacrylic acid and derivatives thereof. ### Claim 4 (depends on 1) The process of claim 1, wherein the monomer (B) is selected from the group consisting of maleic acid, fumaric acid, itaconic acid (2-methylenebutanedioic acid), citraconic acid (2-methylmaleic acid), glutaconic acid (pent-2-ene-1,5-dicarboxylic acid), 2,3-dimethylmaleic acid, 2-methyl-fumaric acid, 2,3-dimethylfumaric acid, methylenemalonic acid, tetrahydrophthalic acid, and derivatives thereof. ### Claim 5 (depends on 1) The process of claim 1, wherein the monomer (B) is maleic anhydride. ### Claim 6 (depends on 1) The process of claim 1, wherein the bismaleation level is at least 11%. ### Claim 7 (depends on 1) The process of claim 1, wherein a proportion of unconverted polyisobutene in the reaction product is not more than 30% by weight. ### Claim 8 (depends on 1) The process of claim 1, wherein the corrosion inhibitor is comprised in a gasoline fuel having a sodium content, a potassium content, or both, of at least 0.1 ppm by weight. ### Claim 9 (depends on 1) The process of claim 1, wherein the corrosion inhibitor is comprised in a gasoline fuel having a magnesium content, a calcium content, or both, of at least 0.1 ppm by weight. ### Claim 10 (depends on 1) The process of claim 1, wherein the corrosion inhibitor is comprised in a gasoline fuel having a zinc content of at least 0.1 ppm by weight. ### Claim 11 (depends on 1) The process of claim 1, wherein the reducing of corrosion comprises preventing and reducing deposits in a fuel system. ### Claim 12 (depends on 1) The process of claim 1, wherein the bismaleation level is at least 15%. ### Claim 13 (depends on 1) The process of claim 1, wherein the bismaleation level is up to 35%. ### Claim 14 (depends on 1) The process of claim 1, wherein the bismaleation level is up to 30%. ### Claim 15 (depends on 1) The process of claim 1, wherein the polyisobutene (A) has a number-average molecular weight Mn of 700 to 2500. ### Claim 16 (depends on 1) The process of claim 1, wherein the polyisobutene (A) has a number-average molecular weight Mn up to 1100. ### Claim 17 (depends on 1) The process of claim 1, wherein the compound (B) comprises acrylic acid and/or methacrylic acid. ### Claim 18 (depends on 1) The process of claim 1, wherein the compound (B) comprises crotonic acid and/or ethylacrylic acid.