# US 2010/0167072 A1 · Electrocoat composition and process replacing phosphate pretreatment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0167072 A1 - Document ID: US20100167072A1 - Status: Published application - Kind: A1 - Application number: 12/345,277 - Filed: 2008-12-29 - Published: 2010-07-01 - Earliest claimed: 2008-12-29 - Assignees: BASF SE - Inventors: Abdellatif Chouai; Timothy S December - Web page: https://patentgrep.com/patent/US20100167072A1 ## CPC - C25D 13/14: Tubes; Rings; Hollow bodies - C08G 59/186: {with acids} - C08G 59/304: {containing phosphorus} - C09D 5/028: {Pigments; Filters} - C09D 5/4434: {characterised by the nature of the epoxy binder} - C09D 5/4488: {Cathodic paints (C09D5/4403 - C09D5/4476 take precedence)} - C09D 7/61: inorganic - C09D 163/00: Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins - C25D 13/04: with organic material - C25D 15/00: Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires - C08K 3/22: of metals - C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract An aqueous coating composition comprises a metal oxide selected from the group consisting of bismuth oxide, vanadium oxide, manganese oxide, cobalt oxide, zinc oxide, strontium oxide, yttrium oxide, molybdenum oxide, zirconium oxide, lanthanum oxide, oxides of the lanthanide series of elements and combinations thereof and an electrodepositable binder, the binder comprising (a) a phosphorous-containing group in which X is a hydrogen, a monovalent hydrocarbon, an alkyl group such as an aminoalkyl group, or an oxygen atom having a single covalent bond to the phosphorous atom, and each oxygen atom has a covalent bond to a hydrogen atom, an alkyl group, an aryl group, an alkylaryl group, an arylalkyl group, or the resin, with the caveat that at least one oxygen atom has a covalent bond to resin; (b) a carboxylate group separated by from 2 to 4 carbons from an ester group; and (c) a tridentate amine ligand. The coating composition can be electrodeposited on a metal substrate to provide superior corrosion resistance. ## Claims ### Claim 1 An aqueous coating composition comprising a metal oxide selected from the group consisting of bismuth oxide, vanadium oxide, manganese oxide, cobalt oxide, zinc oxide, strontium oxide, yttrium oxide, molybdenum oxide, zirconium oxide, lanthanum oxide, oxides of the lanthanide series of elements and combinations thereof and an electrodepositable binder, the binder comprising resin or resins comprising: (a) a phosphorous-containing group in which X is a hydrogen, a monovalent hydrocarbon, or an oxygen atom having a single covalent bond to the phosphorous atom, and each oxygen atom has a covalent bond to a hydrogen atom, an alkyl group, an aryl group, an alkylaryl group, an arylalkyl group, or the resin or one or the resins, with the caveat that at least one oxygen atom has a covalent bond to the resin; (b) a carboxylate group separated by from 2 to 4 carbons from an ester group; and (c) a tridentate amine ligand. ### Claim 2 (depends on 1) An aqueous coating composition according to claim 1, wherein the binder comprises an epoxy resin comprising a member selected from the group consisting of the phosphorous-containing group, the carboxylate group separated by 2 to 4 carbons from an ester group, the tridentate amine ligand, and combinations thereof. ### Claim 3 (depends on 1) An aqueous coating composition according to claim 1, wherein the binder comprises as phosphorous-containing group a monophosphate ester group, a monophosphonic acid ester group, or both. ### Claim 4 (depends on 1) An aqueous coating composition according to claim 1, wherein the binder comprises as phosphorous-containing group a monophosphate ester group, a monophosphonic acid ester group, or both. ### Claim 5 (depends on 1) An aqueous coating composition according to claim 1, wherein the binder comprises as phosphorous-containing group a triphosphate ester group. ### Claim 6 (depends on 1) An aqueous coating composition according to claim 1, wherein the metal oxide is selected from the group consisting of bismuth oxide, vanadium oxide, manganese oxide, cobalt oxide, zinc oxide, yttrium oxide, molybdenum oxide, zirconium oxide, and combinations thereof. ### Claim 7 (depends on 1) An aqueous coating composition according to claim 1, comprising from about 0.01 to about 1 percent by weight of the metal oxide based on total binder solids weight. ### Claim 8 (depends on 1) An aqueous coating composition according to claim 1, wherein the binder comprises an electrodepositable resin free of the phosphorous-containing group, the carboxylate group separated by from 2 to 4 carbons from an ester group, and the tridentate amine ligand, ### Claim 9 (depends on 1) An aqueous coating composition according to claim 1, wherein the binder comprises at least one vinyl resin comprising a member selected from the group consisting of the phosphorous-containing group, the carboxylate group separated by from 2 to 4 carbons from an ester group, the tridentate amine ligand, and combinations thereof. ### Claim 10 (depends on 1) An aqueous coating composition according to claim 1, wherein the carboxyl group separated by from 2 to 4 carbons from an ester group is the reaction product of a cyclic anhydride with a hydroxyl group. ### Claim 11 (depends on 1) An aqueous coating composition according to claim 1, wherein the tridentate amine ligand has a structure —N(—R′—NR2)2, in which R′ is an alkyl group having from one up to four carbon atoms and optionally having an ether oxygen and each R is independently an alkyl of 1 to 4 carbon atoms. ### Claim 12 (depends on 11) An aqueous coating composition according to claim 11, wherein R′ is an ethylene or propylene group and each R is a methyl group. ### Claim 13 (depends on 1) An aqueous coating composition according to claim 1, wherein the binder comprises a tridentate amine ligand-containing resin comprising a further amine group other than the tridentate amine ligand. ### Claim 14 (depends on 1) A method of coating an electrically conductive substrate, comprising: (a) cleaning the metal automotive vehicle body; (b) placing the cleaned metal automotive vehicle body into an aqueous coating composition according to claim 1; (c) connecting the metal automotive vehicle body as an electrode in an electric circuit and passing a current through the aqueous electrodeposition coating composition to deposit a coating layer onto the metal automotive vehicle body. ### Claim 15 (depends on 14) A method of coating an electrically conductive substrate according to claim 14, wherein the metal automotive vehicle body is free of a phosphate pre-treatment. ### Claim 16 (depends on 14) A method of coating an electrically conductive substrate according to claim 14, wherein the binder comprises an epoxy resin comprising a member selected from the group consisting of the phosphorous-containing group, the carboxylate group separated by from 2 to 4 carbons from an ester group, the tridentate amine ligand, and combinations thereof. ### Claim 17 (depends on 14) A method of coating an electrically conductive substrate according to claim 14, wherein the metal oxide is selected from the group consisting of bismuth oxide, vanadium oxide, manganese oxide, cobalt oxide, zinc oxide, yttrium oxide, molybdenum oxide, zirconium oxide, and combinations thereof. ### Claim 18 (depends on 14) A method of coating an electrically conductive substrate according to claim 14, wherein the aqueous coating composition comprises from about 0.01 to about 1 percent by weight of the metal oxide based on total binder solids weight. ### Claim 19 (depends on 14) A coated substrate prepared according to the method of claim 14. ### Claim 20 (depends on 14) A method of coating an electrically conductive substrate according to claim 14, wherein the electrically conductive substrate comprises a metal automotive vehicle body. ### Claim 21 (depends on 20) A method of coating an electrically conductive substrate according to claim 20, further comprising (d) applying a further coating layer over the electrocoat coating layer. ### Claim 22 (depends on 21) A method according to claim 21, wherein the further coating layer is a primer coating layer. ### Claim 23 (depends on 21) A method according to claim 21, wherein the further coating layer is a topcoat coating layer. ### Claim 24 (depends on 21) A method according to claim 21, wherein the electrocoat coating layer is cured before step (d). ### Claim 25 (depends on 21) A method according to claim 21, wherein the electrocoat coating layer and the further coating layer are cured together after step (d). ### Claim 26 (depends on 22) A method according to claim 22, further comprising: (e) applying a topcoat layer over the primer coating layer. ### Claim 27 (depends on 26) A method according to claim 26, wherein the topcoat layer comprises a basecoat/clearcoat composite coating. ### Claim 28 (depends on 26) A method according to claim 26, wherein the primer layer is cured before applying the topcoat layer. ### Claim 29 (depends on 26) A method according to claim 26, wherein the primer layer and the topcoat layer are cured together. ### Claim 30 (depends on 26) A method according to claim 26, wherein the electrocoat coating layer, the primer layer, and the topcoat layer are cured together. ### Claim 31 (depends on 21) A method according to claim 21, wherein the metal automotive vehicle body is free of a phosphate pre-treatment.