ZA200302312B

ZA200302312B - Method for coating metallic surfaces and use of substrates coated in such a way or coatings produced in such a way.

Info

Publication number: ZA200302312B
Application number: ZA200302312A
Authority: ZA
Inventors: Norbert Maurus
Original assignee: Chemetall Gmbh
Priority date: 2000-09-25
Filing date: 2003-03-25
Publication date: 2004-03-25
Also published as: DE10146446B4; ZA200302123B; DE10146446A1

Description

, ~ *4003/2312 s © WO 02/24820 - 1 - PCT/EP01/11034

Method for coating metallic surfaces and use of substrates coated in such a way or coatings produced in such a way

The invention relates to a method of coating metallic surfaces and also to the use of the substrates thus coated.

Methods of coating metallic surfaces with an aqueous dispersion which in addition to water comprises at least one UV-crosslinkable resin and at least one photoinitiator are fundamentally known. They are used for coating with UV paints or similar UV-curing organic coatings. Methods of this kind are customarily intended for the coating of floor coverings, wood elements, cork elements, plastics parts, paper, films or packaging, but are not suitable for the rapid and corrosion- resistant coating, for example, of strip-form metallic material at speeds of 10 to 250 m/min. It is known that

UV curing is outstandingly suitable in principle for curing coatings on temperature-sensitive substrates without exposure to relatively high temperatures.

Moreover, the majority of organic coatings on metallic substrates such as metal sheets, for example, for the processing industry are coated with solventborne or with aqueous varnishes which must be thermally dried, crosslinked and/or cured. All these aforementioned coatings presently normally exhibit thicknesses in the region of far more than 20 um and in some cases well over 100 um. In many cases, UV curing may have the advantage that a corrosion-resistant, robust organic coating can be applied solventlessly.

To the knowledge of the applicant, no UV-curing ] - organic, sufficiently flexible, and at the same time N sufficiently corrosion-resistant coating has to date been applied to metallic strips. There is a need to propose aqueous dispersions which take account of the s - 2 = altered conditions of use of paintlike compositions that arise in the case of rapid strip coating and which cure not thermally, or substantially not thermally, but instead cure with induction by active radiation. In the text below, actinic radiation is referred to as UV radiation and the crosslinking induced thereby as UV curing.

It was therefore an object to propose a method of coating metallic substrates which is also suitable for the coating of fast-moving strips and with which it is possible to apply organic, sufficiently flexible, and at the same time sufficiently corrosion-resistant coatings. This method ought to be suitable for economic and substantially environmentally friendly industrial implementation.

The object is achieved in accordance with the invention by a method of coating metallic surfaces by wetting this surface with an aqueous dispersion which in addition to water comprises at least one uv- crosslinkable water-soluble and/or water-dispersible : resin, at least one wax as forming additive, at least one photoinitiator, and at least one corrosion inhibitor, the coating which has formed on the metallic surface being dried and cured, said method being characterized in that a coating is formed which in cured form has a thickness of up to 10 um and which on a test surface subjected to forming in a mandrel bending test in accordance with DIN ISO 6860 - but without cracking of the test surface - with a mandrel of from 3.2 mm to 38 mm in diameter produces no signs of corrosion > 5 area-% in the course of an immediately following condensation climate test in accordance with

DIN 50017 KFW over 240 hours.

For the purposes of this ‘application the term “dispersion” is used as a generic term embracing, for example, emulsions, microemulsions, and suspensions.

a. ) - 3 -

The forming additive, which may also have a corrosion inhibiting effect, may at the same time also be the corrosion inhibitor, so that it is not necessary to add different additives for forming and for inhibiting corrosion.

This corrosion resistance is preferably achieved if testing is carried out in this way over 1200 hours or with particular preference over 2400 hours and still no signs of corrosion >5% become discernible on the test surface which has been subjected to forming.

In the case of the method of the invention the cured layer preferably has a sufficient handling strength. In particular it may have a Persos [sic] pendulum hardness in the range from 30 to 550 s.

For the method of the invention the dispersion may comprise a resin or a mixture of resins selected from the group consisting of derivatives on the basis of acrylate, epoxide, phenol, polyethylene, polyurethane, polyester, and styrene. The resins stated here may on the stated basis be present in the dispersion individually, as a mixture and/or in chemically bonded form and may be present as monomer, oligomer, polymer, copolymer and/or derivatives thereof, with all transitional forms being possible.

The amount of binders, i.e., of resins and corresponding derivatives, is preferably from 18 to 80% by weight, preferably [sic] from 22 to 75% by weight, in particular from 25 to 45% by weight, based on the solids content. In the case of coating units which produce a relatively thick wet film - in the range from 5 to 15 um, for instance - on the substrate, a fairly _ low concentration of binders will be preferred. Tr

Conversely, in the case of coating units which produce a relatively thin wet film - in the range from 1.5 to 8 um, for instance - a high concentration of binders me tS RBAT . oben RH

. 24. MAR. 2003 9.38 ON PATENTABTEILUNG NR. 203 5. 5/19

SE - 4 - ; is part of the raw material basis of the binders and is therefore included here in the amount of the binders.

Wetting agents often also serve as adhesion promoters.

The amount of separately added water, which is not added in the form of a dispersion or solution, can be : 30 from 0 to 40% by weight, preferably from 5 to 25% by weight, more preferably from 8 to 18% by weight.

However, it may also be preferable to add additives : and/or binders in place of this water or in place of some of this water.

The total water content of the dispersion of the : invention can be from 20 to 95% by weight, preferably from 25 to 85% by weight. The total water content depends esgentially on the degired conditions of use.

AMENDED SHEET mn tt BTTI—— © a AER YELL ETRE THAR

) 24. NAR. 2003 9:38 DN PATENTABTEILUNG NR. 203 S. 6/19 “a N , - 5 -

For rapid strip coating, for example, a total water content in the range from 70 to 80% by weight may be particularly of interest, while for the coating of parts the corresponding range is from 85 to 95% by weight.

The dispersion may comprise at least one corrosion inhibitor selected from the group consisting of organic, inorganic, and organometallic compounds, coated or uncoated inorganic pigments such as Feg0s,

Si0> and/or TiO2, for example, nanoparticles, aluminum phosphates, antimony compounds such as antimony . hydroxide, zine phosphates, zing salts of aminocarbexylates, of 5-nitroisophthalic acid or cyanic acid, polymeric amine salts with fatty acids, TPA-amine complexes, Phosphates and/or carbonates based on titanium or zirconium, metal salts of dodecylnaphthalenesulfonic acid, amino complexes and transition metal complexes of toluenepropionic acid, . : 20 silanes, and 2-mercaptobenzothiazolylsuccinic acid and/or amino salts thereof. It is also possible to add an addition of conductive polymers, especially for reasons of corrosion control. The amount of at least one corrosion inhibitor varies preferably in the range from 0.4 to 10% by weight, more preferably in the range from 0.6 to 6% by weight.

The dispersion also comprises at least one forming : additive. It may comprise at least one wax as forming additive, in particular a wax selected from the group consisting of paraffins, polyethylenes and polypropylenes, especially an oxidized wax. The dispersion may, inter alia, have been stabilized anionically or cationically, ]

AMENDED SHEET

Pi a ~ 6 - from 0.3 to 10% by weight, more preferably from 0.6 to 8% by weight, with particular preference at least 1% by weight. The amount of wax in the coatings produced with the dispersion of the invention is important in order to allow forming to be carried out with easier sliding, which owing to the relatively low forces leads to defect-free reformed surfaces. In this way, cracks and instances of flaking in this coating are avoided.

Defects and instances of flaking quickly lead to severe signs of corrosion.

To this dispersion it is possible to add, as an inorganic compound in particle form, a finely divided powder or a dispersion with fine particles of, for example, a carbonate, oxide, silicate or sulfate. This inorganic compound can be added to the dispersion in the form of particles in a particle size distribution substantially in the range from 5 nm to 300 nm, preferably in the range from 6 to 100 nm, more preferably in the range from 7 to 60 nm, very preferably in the range from 8 to 25 nm. As inorganic compound in particle form it is possible with preference to add particles based on alumina, barium sulfate, silica, silicate, titanium oxide, zinc oxide and/or zirconium oxide. It is, however, also possible to add electrically conductive particles such as those based on coated pigments, graphite/carbon black, iron phosphide, iron oxide and/or molybdenum sulfide, for example.

As organic solvent for the organic polymers it is possible to use at least one water-miscible and/or water-soluble alcohol, a glycol ether, N-methyl- pyrrolidone and/or water. Where a solvent mixture is used a mixture of at least one long-chain alcohol, such : : as propylene glycol, an ester alcohol, a glycol ether or and/or butanediol with water, is particularly advisable; otherwise it is advisable to use water alone, especially deionized water. The amount of y 24. MAR. 2003 9:39 ON PATENTABTEILUNG NR. 203 5. 7/19

Pa ) - 7 -

The acid groups of the synthetic resins may be stabilized using ammonia and/or using amines such as, for example, morpholine, dimethylethanolamine, diethyl- ethanolamine or triethanolamine and/or using alkali ‘metal hydroxides such as, A for example, sodium . co hydroxide.

The agueous composition may where appropriate comprise in each case at least one biocide, one defoamer and/or . - tone wetting agent. The dispersion may also comprise a ‘ wetting agent, based in certain circumstances on } 15 polysiloxanes. The amount of individual examples of a these substances, where used, should be as low as : possible. Their amount in total should not exceed 1% by : ' weight. : . 2Q0 As biocide it is possible with preference to use oxane derivatives, formaldehyde donors and/or hydroxy-methyl : : ureide. As defoamers it is possible with preference to : use those based on polysiloxane and/or on hydrophobic . solids. :

The metallic surface may be composed essentially of aluminum, iron, copper, magnesium, nickel, titanium, zinc and/or of an alloy containing aluminum, iron, copper, magnesium, nickel, titanium and/or zine, or of two or more of these metallic substances,

The metallic surface may have been cleaned and/or galvanized, especially freshly cleaned ox freshly galvanized, the galvanization possibly consisting of , 35 zinc ox of a zinc-containing alley such as, for . example, a zinc alloy containing aluminum and/or containing iren. It has preferably been hot dip alloy ' galvanized or electrolytically galvanized or coated

AMENDED SHEET p 24. MER. 2003 9:39 ON PATENTABTEILUNG NR. 203 S. 8/19

KJ : - 8 - with an aluminum-zine alloy such as Galfan® or

Galvalume®. 8

The metallic surface may comprise at least 80% of aluminum and may have been cleaned, where appropriate pickled, where appropriate anodized, and where appropriate passivated. Anodizing - where appropriate after pickling ~- may be an alternative to pickling and passivating.

The metallic surface may he cleaned and, where appropriate, pretreated, in particular pretreated with a pretreatment solution based on fluoride, iron~-cobalt . . and/or phesphate.

AMENDED SHEET

24. MAR, 2003 9:39 ON PATENTABTETLUNG NR. 203 S. 9/19 —_—— i5 . 25 fe —— to prevent the organic coating having unirradiated portions or in order to be able to cure the entire coating at one and the same time.

Before or both before and during the UV cure, the metallic surface contacted with the dispersion may be . physically dried. This physical drving is particularly important for the constituents of the resin which are unable to crosslink by UV curing. . 35 .

It is possible to form an organic coating which, after curing, has a coatweight in the range from 0.2 to 20 g/cm?, preferably in the range from 0.6 to 12 g/cm?, in particular in the range from 1 to 5 g/cm®. In the

AMENDED SEEET

. 24. MAR. 2003 9:39 ON PATENTABTEILUNG NR. 203 5. 10/19 case of coatings which include inorganic additives such as pigments, for example, for a given coat volume the coatweight is generally much higher than without these additives.

The cured organic coating may have a thickness of from 0.1 to 10 pm, preferably from 0.3 to 5 um, more preferably from 0.5 to 3 um. 1¢ The cured coating may be readily paintable.

Paintability, however, is not ensured from the outset } in every case.

The coated metal parts, wires, strips or strip sections may be coated with at least one further organic coating, in particular with a coating material such as, for example, a topcoat, an adhesive coat, an adhesive backing, a film, a foam and/or a print coat.

The substrate with the cured coating may where appropriate be cut, formed or joined to another part by adhesive bonding, welding, soldering, clinching, riveting or otherwise. Soldering is possible only on bare substrates, so that for that purpose the cecating must be removed at least in part. In the case of welding it is advisable for the organic coating of the invention to have a thickness of on average not more than 3 um, preferably not more than 1.5 um, and also, where appropriate, a relatively high fraction of at ' 30 least one electrically conductive compound, especially electrically conductive particles j

AMENDED SEEET

E] - 11 - thinner the coating of the invention, the lower can be the fractions of electrically conductive substance in the aqueous mixture. They may then in certain circumstances lie at levels below 30% by weight, preferably below 18% by weight, based on the solids content.

The dispersion of the invention can also be utilized substantially or entirely free from heavy metals such as chromium, copper, and nickel. Particular preference is given to chromium-free methods in which no chromium is deliberately added. The dispersion of the invention may also have a composition which is free of organic solvents.

In the case of strip coatings this method can be employed in such a way that it need not be used on a separate strip coating line but instead can be applied on the same line following an operation, for example, of galvanizing. Indeed, this is often possible with no loss of capacity on the line.

The coating method of the invention is preferably employed at application temperatures in the range from 15 to 40°C with drying and UV curing preferably only at 40 to 80°C, since there is no need to heat the dispersion or to heat the coated substrate any higher for the purpose of crosslinking, thereby allowing a corresponding energy saving as compared with thermal curing.

If the amounts of pigments and coloring substances added are not too great, the coating of the invention can be made transparent, so allowing the visual impression of a metallic surface to be retained to a . very substantial extent. In the case of the coating of he metallically coated steel sheets with thin organic coatings it is desirable for the microstructure and the coloring of the metallic surface to remain visible,

B 24. MAR. 2003 9:40 ON PATENTABTEILUNG NR. 203 S. 11/19 0 - 12 -

It was additionally surprising that the coating method . of the invention led to coatings which allow severe ‘ extension as in the case of forming, for example, on the conical mandrel very substantially without eracking - indeed, without notable detractions from the - corrosion resistance. .

The inventive coating with dispersions in accordance with Examples 1 to 4 surprisingly proved equivalent to : ) the chromium~free coatings on Galvalume® in the outdoor weathering test. :

In view of the high corrosion resistance it is necessary only in certain instances, or only for reasons of color coating and/or effect coating, to overcoat the coating of the invention.

The substrates coated by the method of the ipvention can be used as wire, wire winding, wire mesh, metal sheet, paneling, shielding, bodywork or part of a : bodywork, part of a vehicle, trailer, recreational vehicle or missile, covering, casing, lamp, light, traffic light element, furniture item or furniture element, element of a household appliance, Irame, profile, shaped part of complex geometry, guide-rail element, radiator element or fence element, bumper, part of or with at least one pipe and/or one profile, window frame, door frame or cycle frame, or as a small part such as, for example, a bolt, nut, flange, spring or a spectacle frame. The dispersion of the invention may serve for producing a coating which is used as a primer, in particular as a lubricating primer or : welding primer.

AMENDED SHEET

24. MAR. 2003 9:40 DN PATENTABTEILUNG NR. 203 S, 12/19 .

A ] - 13 -

Examples

The subject matter of the invention is illustrated : below with reference to examples.

Hot-dip-galvanized steel panels (Z) and Galvalume®-

K coated steel panels (AZ) were coated with the aqueous © dispersion of the invention of the examples according - te the invention after alkaline cleaning. This dispersion was prepared by intensive mixing (dissolver) "of the components indicated in Table 1.

AMENDED SHEET

2 - 14 -

Table 1: Composition of the aqueous UV-curable dispersions and results of the investigations on the coated substrates. Amounts in % by weight, corrosion figures in area-%.

PE BE polyurethane dispersion A 85.0 - - - acrylic-polyurethane hybrid - 70.8 70.8 70.8 ) polyethylene glycol diacrylate 1.6 - - - polyurethane dispersion B - 8.0 8.0 8.0 styrene-acrylate copolymer - 6.0 6.0 6.0 polyethylene wax emulsion 2.0 2.0 2.0 2.0 acid adduct 4-oxo-4-p-tolyl 1.0 1.0 1.0 1.0 butyrate, 4-ethylmorpholine hydroxycyclohexyl phenyl ketone, } 0.9 0.9 0.9 0.9 benzophenone polyether-modified polydimethyl- 0.2 0.2 0.2 0.2 siloxane added fully deionized water 9.3 11.2 11.2 11.2 total binder content 31.35 30.58 | 30.58 | 30.58 total water content 66 67 67 67 results of the DIN 50017 KFW test: areal corrosion, 240 h 0% <5% <1% <1% conical mandrel 3.2 to 38 mm, 240 h <5% <5% <5% <5% areal corrosion, 1200 h <5% <5% <5% <5% conical mandrel 3.2 to 38 mm, 1200 h <5% <5% <20% <20% results of the DIN 50021 salt spray : test, 24 h: areal corrosion 20% 20% <1% <10% edge corrosion 3 mm 3 mm <1 mm | <1 mm conical mandrel 3.2 to 38 mm 20% 50% 20% 10%

The polyurethane dispersion A used was an aqueous UV- . curing dispersion with a particle size of less than oo 100 nm, a solids content of 35% by weight, and a pH of 7.5. The polyurethane dispersion B employed was an aqueous, non-UV-curing dispersion with a solids content a of 35% by weight and a pH of 8.0. The acrylic- polyurethane hybrid (copolymer) is an aqueous UV-curing dispersion with a solids content of 40% by weight and a

PH of 7.0. The polyethylene glycol diacrylate is an aqueous, UV-curing solution with a solids content of 100% by weight and with an acid value of 25. The styrene-acrylate copolymer is an aqueous dispersion with a solids content of 50% by weight and a pH of 8.0 which improves the adhesion to the substrate surface.

The polyethylene wax emulsion has a solids content of 50% by weight, a melting point in the range from 62 to 95°C, and a pH of 9.5. The presence of this emulsion significantly enhances the slip properties and forming properties. The 4-oxo-4-p-tolyl butyrate-4-ethyl- morpholine acid adduct corrosion inhibitor as a TPA- amine complex enhances the corrosion control and at the same time the adhesion of the polymer coating to the substrate. The mixture of hydroxycyclohexylphenyl ketone and benzophenone serves as a photoinitiator for initiating the polymerization in the case of the UV cure. The polyether-modified polydimethylsiloxane wetting agent enhances the surface wettability and so the adhesion to the substrate surface. The addition of deionized water serves to adjust the solids content and the viscosity.

Coatings were applied at room temperature by roller application and drying, and had a thickness approximately in the range from about 1.2 to 3.5 um.

The coated substrates were dried in a circulating air oven at about 50 to 90°C and were subsequently irradiated in continuous travel with UV-C light from a 160 W/cm mercury lamp. Virtually complete polymerization took place within two seconds. . The results of the condensation climate test in or accordance with DIN 50017 KFW over 240 h show an adhesive strength which ranges from adequate to good but which can be further increased significantly by

Claims

Lar mman Luvs ae lu Lat TIL ELI Luu wie Lvl) ST y . ~ 18 - Claims

“1. 2A method of coating metallic surfaces by wetting this surface with an aqueous dispersion which in addition to water comprises at least one UV- . crosslinkable water-soluble and/or water- dispersible resin, at least one wax as forming addicive, at least one inorganic compound in particle form, at least one photoinitiator, and at least ome corrosion inhibitor, to the dispersion there being added, as an inorganic compound in } particle form, a finely divided powder or a dispersion with fine particles, the coating which has formed on the metallic surface being dried and cured, a coating being formed which in cured form . has a thickness of up to 10 um and which on a test surface subjected to forming in a mandrel bending test in accordance with DIN ISO 6860 - but without cracking of the test surface - with a mandrel of © from 3.2 mm to 38 mm in diameter produces no signs of corrosion > 5% in the course of an immediately following condensation climate test in accordance with DIN 50017 KFW over 240 hours.

2. The method of claim 1, characterized in that the } ‘dispersion comprises a resin or a mixture of resins selected’ from the group consisting of derivatives on the basis of acrylate, epoxide, phenol, polyethylene, polyurethane, polyester, and a 30 styrene. .

.o- C3. The method of claim 1 or 2, characterized ifn that Co the dispersion comprises at least one photoinitiator selected from the group consisting : i 35 of acetophenone, anthraquinone, benzoin, . benzophenone, : 1-benzoyleyclohexanol, phenyl ketone, thioxanthone, and derivatives thereof, or at least on organophosphorus compound.

4. The method of claim 3, characterized in that the at least one organophosphorus compound is an acylphosphine oxide. AMENDED SHEET AMENDED SHEET 2004 -5- 5

Ls MD Luv) 7.9%) UH IATL AUT LL LYNG nn Lv J 13/7 17

£5. The method of any of the above claims, characterized in that the dispersion comprises at least one corrosion inhibitor selected from the group consisting of organometallic compounds, coated or uncoated inorganic pigments, aluminum phosphates, zine phosphates, zine salts of aminocarboxylates, of S-nitroisophthalic acid or cyanie acid, polymeric amino salts with fatty acids, metal salts of dodecylnaphthalenesulfonic acid, amino complexes and transition metal complexes of toluenepropionic acid, silanes, and 2-mercaptobenzothiazolylsuccinic acid, and/or amino salts thereof. 3

6. The method of any of the above claims, } characterized in that the dispersion comprises at least one forming additive.

T. - The method of any of the above claims, ] 20 characterized in that the dispersion comprises at least one wax as forming additive.

8. The method of any of the above claims, characterized in that the melting point of the wax used as lubricant is in the range from 40 to 160°C.

9. The method of any of the above claims, : - CC . + characterized in that the dispersion comprises a = = . wetting agent, in certain circumstances based on polysiloxanes.

10. The method of any of the above claims, characterized in that to the dispersion there is added, as an inorganic compound in particle form, a finely divided powder or a dispersion with fine AMENDED SHEET AMENDED SHEET 2004 -05- 20

. 24. MAK L003 Y:4] UV FAIENIABIEILUNG NR. £UD Oo. U7 b particles of a carbonate, oxide, silicate or sulfate.

11. The method of any of the above claims, characterized in that, as inorganic compound in particle form, particles in a particle size distribution substantially in the range from 5 nm to 300 nm are added.

12. The method of any of the above c¢laims,

. characterized in that as inorganic compound in particle form particles based on alumina, barium sulfate, s=ilieca, gilicate, titanium oxide, zinc oxide and/or zirconium oxide are added.

13. The methed of any of the above claims, characterized in that as organic solvent for the organic polymers at least one water-miscible and/or water-soluble alcohol, a glyeol ether, N- . methylpyrrolidone and/or water is used.

14. The method of any of the above claims, characterized in that the amount of organic solvent is from 0.1 to 5% by weight.

. 25

. 15. The method of any of the above claims, characterized in that the acid groups of the synthetic resins are stabilized using ammonia, using amines and/or using alkali metal hydroxides. Co 16. The method of any of the above claims, coe characterized in that the aqueous composition comprises at least one electrically conductive compound.

17. The method of claim 16, characterized in that the ) at least one electrically conductive compound is an electrically conductive polymer or electrically conductive inorganic particles. AMENDED SHEET . AMENDED SHE: 2004 -05- 20

Ls MO Lyv2 Je Vin ratLiviAag iL Lwin We LV JD Vv, Tus vz Y * 18. The method of claim 17, characterized in that the - electrically conductive inorganic particles are those of less than 1 pm in average size.

5 .

19. The method of any of the above claims, : characterized din that the aqueous composition comprises where appropriate in each case at least one biocide, one defoamer and/or one wetting . 0 agent. .

. 20. The method of any of the above claims, characterized in that the metallic surface is composed essentially of aluminum, iron, copper, magnesium, nickel, titanium, zinc and/or of an alloy containing aluminum, iron, copper, ' magnesium, nickel, titanium and/or zinc or of two or more of these metallic substances,

21. The method of any of the above claims, characterixzed in that the metallic surface has been cleaned and/or galvanized.

22. The method of any of the above claims, characterized in that the metallic surface comprises at least 80% of aluminum and has been cleaned, where appropriate pickled, where appropriate anddized, and where appropriate passivated. Co 23. The method of any of the above claims, characterized in that the metallic surface is cleaned and, where appropriate, pretreated. ) 24, The method of any of the above claims, characterized in that the metallic surface is AMENDED SHEET “MENDED SHEET 2004 -05- 5g

LTaman LVS se Ta LrorarLinuibiLving ner RE y - a5 - contacted with the dispersion by the roller application method, by wetting and squeezing off, : by flow coating or by dipping, and a wet film is , developed.

25. The method of any of the above claims, ’ characterized in that the metallic surface is ’ . wetted with the dispersion for a time of from . 0.001 second up to 30 minutes. :

26. The method of claim 25, characterized in that, in , : the case of the rapid coating of a strip, the surface is wetted for a time of from 0.001 to 1 second.

27. The method of claim 25, characterized in that, the at least in the case of the coating of parts, the . surface is wetted for a time of from 10 seconds to 30 minutes.

28. The method of any of the above claims, - characterized in that, on coating with the dispersion, the metallic surface has a temperature in the range from 5 to 60°C.

29. The method of any of the above claims, characterized in that the dispersion on coating has a temperature in the range from 5 to 60°C. Coe 30. The method of any of the above claims, oo characterized in that the metallic surface contacted with the dispersion is dried by air- circulation heating methods, inductively and/or by radiant heat, with the volatile fractions of the dispersion being removed, where appropriate, by - : blowing. :

31. The method of any of the above claims, characterized in that the metallic surface contacted with the dispersion is dried at a substrate temperature in the range from room ’ - temperature up to 180°C. AMENDED SHEET AMENDED Syer> 2004 -05- 20

LT IMOINe LUV JTL [PE IE A NI S| I RT VIN RSF Gy SEV] SV] We Lyd ve had 17 } y

32. The method of any of the above claims, characterized in that the metallic surface contacted with the dispersion, when it has been dried so as to be substantially or entirely free of water, is irradiated with UV light in order to implement or initiate the polymerization reaction.

33. The method of claim 32, characterized in that the - metallic surface irradiated with UV light in the j . range from 180 to 500nm. ]

34. The method of any of the above claims, characterized in that, before or both before and during the UV cure, the metallic surface contacted with the dispersion is physically dried.

35. The method of any of the above claims, characterized in that an organic coating is formed which, after curing, amounts to a coatweight in the range from 0.2 to 20 g/cm?

36. The method of any of the above claims, characterized in that the cured organic coating CL has a thickness of from 0.1 up to 10 pm. . 37. The method of any of the above claims, characterized in that the «cured coat has a sufficient handling resistance. ,

38. The method of any of the above claims, characterized in that the cured coating is . paintable. RE

39. The method of any of the above claims, : characterized in that the coated metal parts, wires, strips or strip sections are coated with at least one further organic coating. AMENDED SHEET AMENDED SHEET 2004 -05- 20

40. The method of any of the above claims, ‘ characterized in that the substrate with the cured ‘ coating is, where appropriate, cut, formed or joined to another part by adhesive bonding, welding, soldering, clinching, riveting or otherwise.

41. The use of the substrates coated by the method according to at least one of the above claims as wire, wire winding, wire mesh, metal sheet, paneling, shielding, bodywork or part of a bodywork, part of a vehicle, trailer, recreational vehicle or missile, covering, casing, lamp, light, traffic light element, furniture item or furniture element, element of a household appliance, Frame, - profile, shaped part of complex geometry, guide- rail element, radiator element or fence element, bumper, part of or with at least one pipe and/or one profile, window frame, door frame or cycle . 20 frame, or as a small part. . 42, The use of the coating produced by the method according to at least one of claims 1 to 33 as a primer. :

43. A method of coating metallic surface according to claim 1, substantially as herein described to any one of the illustrative examples. AMENDED SHES AMENDED SHEET 2004 -05- 29