# US 11,898,060 B2 · Anti-corrosive zinc primer coating compositions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,060 B2 - Document ID: US11898060B2 - Status: Granted - Kind: B2 - Application number: 15/122,469 - Filed: 2015-03-05 - Published: 2017-03-09 - Granted: 2024-02-13 - Earliest claimed: 2014-03-05 - Assignees: Hempel A/S - Applicants: Hempel A/S - Inventors: Maria Bilurbina Camps; Andreas Lundtang Paulsen; Josep Palasi Bargallo; Tereza Vostracká - Web page: https://patentgrep.com/patent/US11898060B2 ## CPC - C09D 5/106: {containing Zn} - C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances - C09D 7/48: Stabilisers against degradation by oxygen, light or heat - C09D 7/61: inorganic - C09D 7/65: macromolecular (C09D7/41-C09D7/48 take precedence) - C09D 7/70: {characterised by shape, e.g. fibres, flakes or microspheres} - C09D 163/00: Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins - C09D 175/04: Polyurethanes - C08K 3/04: Carbon - C08K 3/041: {Carbon nanotubes} - C08K 3/042: {Graphene or derivatives, e.g. graphene oxides} - C08K 7/20: Glass - C08K 2003/0893: {Zinc} - C08K 2003/2227: {of aluminium} - 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 The present invention concerns anti-corrosive coating compositions, in particular coating compositions for protecting iron and steel structures. In particular, the present invention relates to coating compositions comprising particulate zinc, conductive pigments, and microspheres. The invention furthermore concerns a kit of parts containing the composition, a method for its application, as well as metal structures coated with the composition. ## Claims ### Claim 1 An anticorrosive coating composition comprising: a) an epoxy-based binder system in an amount of 25-50% by solids volume of the coating composition, wherein the epoxy-based binder system comprises one or more curing agents selected from compounds comprising at least two reactive hydrogen atoms linked to nitrogen, and wherein said curing agent is selected from amines or amino functional polymers selected from aliphatic amines, cycloaliphatic amines, polyamidoamines, polyoxyalkylene amines, aminated polyalkoxyethers, alkylene amines, aralkylamines, Mannich bases, amino functional silicones or silanes and including amine adducts and derivatives thereof, b) zinc particles having a content of zinc of at least 90% by weight, wherein the zinc particles are present in the coating composition in an amount of about 20-35% by solids volume, c) microspheres present in an amount of between about 15-25% by solids volume of the coating composition, and d) a conductive pigment, wherein the conductive pigment is graphite, wherein said microspheres are of spheroidal shape and made of silica alumina ceramics, and wherein said microspheres have a true density of about 0.6 to 2.8 g/cc, and wherein the D50 is in the range of about 13 to 80 μm, and with the proviso that said coating composition does not comprise hollow glass microspheres, and wherein said conductive pigment is present in an amount of between about 1.0 to 3.0% by solids volume of the coating composition, and wherein a solids volume ratio of the microspheres to conductive pigment is in the range of 5:1 to 20:1, and wherein the epoxy-based binder system is solvent-borne or water-borne epoxy resin based. ### Claim 2 (depends on 1) The coating composition according to claim 1, wherein said microspheres made of silica alumina ceramics are selected from the group consisting of hollow ceramic gas-filled microspheres, hollow ceramic microspheres with thick walls, solid ceramic microspheres, and mixtures thereof. ### Claim 3 (depends on 1) The coating composition according to claim 1, wherein the coating composition comprises at least one further solvent. ### Claim 4 (depends on 1) The coating composition according to claim 1, wherein the binder system comprises a reactive epoxy diluent selected from monoglycidyl ethers or esters of aliphatic or aromatic compounds. ### Claim 5 (depends on 1) The coating composition according to claim 1, wherein the binder system comprises an epoxy modifier selected from oils, oil derivatives, modified oils, or derivatives thereof. ### Claim 6 (depends on 1) The coating composition according to claim 1, wherein a solids volume ratio of the microspheres to conductive pigment is in the range of 5:1-11:1. ### Claim 7 (depends on 3) The coating composition according to claim 3, wherein the at least one further solvent is an alcohol, an aliphatic hydrocarbon, a cycloaliphatic hydrocarbon, an aromatic hydrocarbon, a ketone, an ether alcohol, an ester, or mixtures thereof. ### Claim 8 (depends on 1) The coating composition according to claim 1, wherein said microspheres have a true density of about 2.0 to 2.8 g/cc. ### Claim 9 (depends on 1) The coating composition according to claim 1, wherein said epoxy-based binder systems comprise a) one or more epoxy resins selected from bisphenol A, bisphenol F and Novolac; and b) one or more curing agents selected from Mannich Bases, polyamidoamines, polyoxyalkylene amines, alkylene amines, aralkylamines, and adducts and derivatives thereof. ### Claim 10 (depends on 1) A kit of parts containing the coating composition as defined in claim 1 comprising two or more containers, wherein one container contains the one or more curing agents and another container contains the remaining components of part a). ### Claim 11 (depends on 10) The kit of parts according to claim 10, wherein the components b) and c) are contained in the same container as the components of part a) other than the one or more curing agents, and wherein component d) is contained in the same container as the one or more curing agents. ### Claim 12 (depends on 1) A coated structure comprising a metal structure having a coating of the coating composition defined in claim 1 applied onto at least a part of the metal structure. ### Claim 13 (depends on 1) A method of coating a metal structure, comprising the step of applying to at least a part of said metal structure thereof a layer of the coating composition as defined in claim 1.