Method for coating metal surfaces using an aqueous compound having polymers, the aqueous compound, and use of the coated substrates

Abstract

The invention concerns a process for coating a metallic surface with an aqueous composition, wherein in addition to water the composition contains a) as the main component, an organic film former consisting of at least one synthetic resin, 70 to 100 wt. % of the content of synthetic resin(s) in the organic film former comprising at least one water-soluble or/and water-dispersible synthetic resin in the form of polymers, copolymers, block copolymers or/and graft copolymers based on synthetic resins selected from the group consisting of polycarbonate, polyurethane, ionomer, poly(meth)acrylate, polyester, polyether or/and polystyrene, the content of polycarbonate and polyurethane being at least 10 wt. % each, b) at least one long-chain alcohol as film-forming aid for the organic film former, c) at least one crosslinker, d) at least one lubricant, and e) at least one substance based on silane, silanol or/and siloxane or/and at least one inorganic compound in particle form with an average particle diameter measured on a scanning electron microscope in the range from 0.005 to 0.3 μm, and f) optionally at least one organic corrosion inhibitor, at least one organic solvent or/and at least one additive, wherein the metallic surface is brought into contact with the aqueous composition and a polymeric film is formed on the metallic surface with a film thickness in the range from 0.01 to 10 μm. The invention also concerns a corresponding aqueous composition.

1 .- 40 . (canceled) 
     
     
         41 . Coated substrate with at least one metallic surface, wherein a coating is on the metallic surface, wherein the coating is prepared by a process comprising the steps of coating a metallic surface with an aqueous composition to form a coated metal part, wherein the aqueous composition comprises:
 an organic film former comprising at least one synthetic resin, wherein 70 to 100 wt % of the content of synthetic resin in the organic film former comprises from at least 30 to 150 g/L of comprising at least one water-soluble or water-dispersible synthetic resin in a content in the range of from 30 to 150 g/L selected from the group consisting of a polymer, copolymer, block polymer and graft polymer; wherein the water soluble or water-dispersible synthetic resin is based on a member a synthetic resin selected from the group consisting of polycarbonate, polyurethane, ionomer, poly(meth)acrylate, polyester, polyether or polystyrene, wherein the content of polycarbonate and polyurethane is being at least 10 wt. % each and the content of polycarbonate and polyurethane together in the organic film former being at least 50 wt. % 50 wt. %;   at least one 4 to 16 carbon long-chain alcohol as film-forming aid for the organic film former selected from the group consisting of a butanediol, an ethylene glycol ether and a polypropylene glycol ether;   at least one inorganic crosslinker based on a member selected from the group consisting of titanium, hafnium and zirconium;   from 2 to 30 g/L of a wax, wherein the wax comprises a cationically stabilized oxidized polyethylene wax with a melting point of about 130° C., and an anionically stabilized paraffin wax with a melting point in the range from 56 to 80° C.;   A) at least one silane, silanol or siloxane or B) at least one inorganic compound in particle form with an average particle diameter measured on a scanning electron microscope in the range from 0.005 to 0.3 μm;   f) optionally at least one organic corrosion inhibitor, at least one organic solvent or at least one additive; and   g) water;   wherein the metallic surface is brought into contact with the aqueous composition and a substantially organic film is formed on the metallic surface, which is then dried and optionally also cured; and   wherein the dried and optionally also cured film has a film thickness in the range from 0.01 to 10 μm, determined by detaching a defined area of the cured film and weighing it, wherein a ratio of wax to the polymer mixture and/or copolymer containing ethylene and/or propylene and acrylic acid is from 0.02:1 to 2:1.   
     
     
         42 . An aqueous composition for pretreating a metallic surface prior to a further coating or for treating a metallic surface, wherein in addition to water the composition contains
 a) as the main component, an organic film former consisting of at least one synthetic resin, 70 to 100 wt. % of the content of synthetic resin(s) in the organic film former comprising at least one water-soluble or water-dispersible synthetic resin in the form of polymers, copolymers, block copolymers or graft copolymers based on synthetic resins selected from the group consisting of polycarbonate, polyurethane, ionomer, poly(meth)acrylate, polyester, polyether or polystyrene, the content of polycarbonate and polyurethane being at least 10 wt. % each and the content of polycarbonate and polyurethane together in the organic film former being at least 50 wt. %,   b) at least one long-chain alcohol as film-forming aid for the organic film former selected from butanediols, ethylene glycol ethers and polypropylene glycol ethers having 6 to 16 C atoms,   c) at least one inorganic crosslinker based on titanium, hafnium or zirconium, which can be used in the basic medium,   d) at least one lubricant, and   e) A) at least one substance based on silane, silanol or siloxane or B) at least one inorganic compound in particle form with an average particle diameter measured on a scanning electron microscope in the range from 0.005 to 0.3 μm, and   f) optionally at least one organic corrosion inhibitor, at least one organic solvent or at least one additive, wherein a ratio of wax to the polymer mixture and/or copolymer containing ethylene and/or propylene and acrylic acid is from 0.02:1 to 2:1.   
     
     
         43 . A wire, a strip or a part, wherein the substrate to be coated is a steel strip, a metal sheet, cladding, screening, a car body or car body part, a part of a vehicle, trailer, caravan or flying body, a covering, housing, lamp, light, traffic light element, an item of furniture or furniture element, an element of a domestic appliance, a frame, a profile, a formed part with complex geometry, a crash barrier element, radiator element or fencing element, a bumper, a part consisting of or having at least one pipe or profile, a window, door or bicycle frame, a wire winding, wire mesh or a small part comprising the coated surface of  claim 41 . 
     
     
         43 . A wire, a strip or a part, wherein the substrate to be coated is a steel strip, a metal sheet, cladding, screening, a car body or car body part, a part of a vehicle, trailer, caravan or flying body, a covering, housing, lamp, light, traffic light element, an item of furniture or furniture element, an element of a domestic appliance, a frame, a profile, a formed part with complex geometry, a crash barrier element, radiator element or fencing element, a bumper, a part consisting of or having at least one pipe or profile, a window, door or bicycle frame, a wire winding, wire mesh or a small part comprising the coated surface of  claim 41 . 
     
     
         44 . Coated substrate with at least one metallic surface, wherein a coating is on the metallic surface, wherein the coating is prepared by a process comprising the steps of coating a metallic surface with an aqueous composition to form a coated metal part, wherein the aqueous composition comprises:
 an organic film former comprising at least one synthetic resin, wherein 70 to 100 wt. % of the content of synthetic resin in the organic film former comprises from at least 30 to 150 g/L of comprising at least one water-soluble or water-dispersible synthetic resin in a content in the range of from 30 to 350 g/L selected from the group consisting of a polymer, copolymer, block polymer and graft polymer; wherein the water soluble or water-dispersible synthetic resin is based on a member a synthetic resin selected from the group consisting of polycarbonate, polyurethane, ionomer, poly(meth)acrylate, polyester, polyether or polystyrene, wherein the content of polycarbonate and polyurethane is being at least 10 wt. % each and the content of polycarbonate and polyurethane together in the organic film former being at least 50 wt. % 50 wt. %;   at least one 4 to 16 carbon long-chain alcohol as film-forming aid for the organic film former selected from the group consisting of a butanediol, an ethylene glycol ether and a polypropylene glycol ether;   at least one inorganic crosslinker based on a member selected from the group consisting of titanium, hafnium and zirconium;   from 2 to 30 g/L of a wax, wherein the wax comprises a cationically stabilized oxidized polyethylene wax with a melting point of about 130° C., and an anionically stabilized paraffin wax with a melting point in the range from 56 to 80° C.;   A) at least one silane, silanol or siloxane or B) at least one inorganic compound in particle form with an average particle diameter measured on a scanning electron microscope in the range from 0.005 to 0.3 μm;   f) optionally at least one organic corrosion inhibitor, at least one organic solvent or at least one additive; and   g) water;   wherein the metallic surface is brought into contact with the aqueous composition and a substantially organic film is formed on the metallic surface, which is then dried and optionally also cured; and   wherein the dried and optionally also cured film has a film thickness in the range from 0.01 to 10 μm, determined by detaching a defined area of the cured film and weighing it, wherein a ratio of wax to the polymer mixture and/or copolymer containing ethylene and/or propylene and acrylic acid is from 0.02:1 to 2:1.   
     
     
         45 . An aqueous composition for pretreating a metallic surface prior to a further coating or for treating a metallic surface, wherein in addition to water the composition contains
 30 to 350 g/L of an organic film former consisting of at least one synthetic resin, 70 to 100 wt. % of the content of synthetic resin(s) in the organic film former comprising at least one water-soluble or water-dispersible synthetic resin in the form of polymers, copolymers, block copolymers or graft copolymers based on synthetic resins selected from the group consisting of polycarbonate, polyurethane, ionomer, poly(meth)acrylate, polyester, polyether or polystyrene, the content of polycarbonate and polyurethane being at least 10 wt. % each and the content of polycarbonate and polyurethane together in the organic film former being at least 50 wt. %,   at least one long-chain alcohol as film-forming aid for the organic film former selected from butanediols, ethylene glycol ethers and polypropylene glycol ethers having 6 to 16 C atoms,   at least one inorganic crosslinker based on titanium, hafnium or zirconium, which can be used in the basic medium,   at least one lubricant, and   A) at least one substance based on silane, silanol or siloxane or B) at least one inorganic compound in particle form with an average particle diameter measured on a scanning electron microscope in the range from 0.005 to 0.3 μm, and   optionally at least one organic corrosion inhibitor, at least one organic solvent or at least one additive, wherein a ratio of wax to the polymer mixture and/or copolymer containing ethylene and/or propylene and acrylic acid is from 0.02:1 to 2:1.