JP2002532234A - Multi-layer lacquer coating method - Google Patents

Abstract

The invention relates to a method for multi-layer varnishing by applying filler layers and/or additional coating agent layers and by subsequently applying a coating layer of base coat/clear lacquer texture or of a pigmented finishing coat consisting of one layer onto a substrate. At least one of the layers is produced by a coating agent which is at least partially hardenable by means of radiation of high energy. After application of said coating agent, exposure to IR radiation and then to radiation of high energy are carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a method for providing a multilayer lacquer coating on a substrate using a radiation-curable coating composition. This method can be used advantageously for automotive and industrial lacquering, preferably for automotive repair lacquering.

The use of UV technology for painting and curing, especially in the wood coating industry, has long been known. However, it is also known to use coating compositions which are curable by high-energy radiation, for applications in other fields, for example in automotive lacquering. These applications also enjoy the advantages of radiation-curable coating compositions, such as, for example, very short curing times, low solvent emissions from the coating compositions and very good hardness of the coatings obtained therefrom.

[0003] In addition to suitable radiation-curable binders and photoinitiators, various types of radiation sources have become known. Thus, for example, DE-A-196 35 447 describes a multi-layer repair lacquer coating in which a coating composition containing only a free-radical polymerizable binder is applied as a clear lacquer or a pigmented finish lacquer by UV irradiation. A method for manufacturing a membrane is described. Once applied, the coating composition is irradiated with UV radiation with a UV flash lamp.

EP-A-0 540 884 discloses a process for producing a multilayer coating for the original lacquering of motor vehicles by applying a clear lacquer layer on a dried or cured base lacquer layer, A method is described in which the coating composition is curable by free radical polymerization and the clear lacquer layer is cured by UV irradiation. The application of the clear lacquer is effected by illuminating with or excluding light of a wavelength above 550 nm.

[0005] High energy radiation curable coating compositions containing high energy radiation, and additionally a binder curable by an additional crosslinking mechanism, have also been described. For example, DE-A-28 09 715 discloses NCO- and acryloyl-functional urethane compounds prepared from hydroxyalkyl (meth) acrylates and polyisocyanates, and curable with high-energy radiation based on multifunctional hydroxyl compounds. Are disclosed.

EP-A-0 000 407 describes high-energy radiation-curable coating compositions based on OH-functional polyester resins esterified with acrylic acid, vinyl compounds and polyisocyanates. In the first curing step, irradiation is performed by UV rays, and in the second curing step, the final curing proceeds at a temperature of 130 to 200 ° C.

[0007] In the heretofore unpublished German patent application P 198 18 735, compounds A having, as binder, free radically polymerizable double bonds and further functional groups which are reactive for the purpose of addition and / or condensation reactions, ) Together with a compound B) having a free-radically polymerizable double bond and additional functional groups reactive for the purpose of addition and / or condensation reactions, the latter being the additional reactivity of compound A) High energy radiation curable coating compositions have been proposed which need to be reactive to the groups. The resulting coating can be completely cured after exposure to UV radiation, for example by exposing it to relatively high temperatures of 30-120 ° C.

[0008] However, the coatings obtained by the above-mentioned multilayer automotive lacquering method using a binder curable with high-energy radiation nevertheless still need some improvement in some respects. These coatings still show weaknesses in terms of weathering and chemical resistance and show poor sander finish. Further, this curing method for high energy radiation curable coating compositions results in volume shrinkage of the applied coating, which causes stresses and cracks in the film. This can cause delamination from the substrate. The problems of cracking and poor interlayer adhesion have not been sufficiently solved to date.

Accordingly, an object of the present invention is a multi-layer automotive lacquering method using an at least partially radiation-curable coating composition, in particular for multi-layer automotive repair lacquering, by means of which cracks are formed. No coating film is obtained, which shows good adhesion to the substrate. The resulting coatings should exhibit very good chemical and weather resistance with good sander finish. These coatings should also exhibit sufficient flexibility, even at elevated crosslink densities. These coatings should also show a perfect visual appearance.

[0010] The purpose of this is to apply one or more surfacer layers and / or further layers (which may be, for example, conventional intermediate layers) on an optionally primed substrate, Applying a finish lacquer layer of lacquer / clear lacquer structure or a pigmented single layer finish lacquer, wherein at least one of the layers of the multilayer structure comprises a coating composition which is at least partially curable with high energy radiation. Once applied, the coating composition being produced and at least partially curable with the high energy radiation is irradiated first with infrared radiation (IR radiation) and then with high energy radiation, preferably ultraviolet radiation (UV radiation). Wherein the irradiation with IR radiation may at least partially overlap with the irradiation with subsequent high-energy radiation. The problem is solved by the multilayer lacquering method provided by the present invention.

The high-energy radiation used can include, in particular, UV radiation, but can also be electron beam radiation. Once the coating composition, which is at least partially curable with high-energy radiation, is preferably applied, an evaporative separation step is performed. This can include evaporative separation at room temperature for 5 to 15 minutes, preferably 5 to 10 minutes. Only after that, IR
Irradiation with lines.

The high energy radiation at least partially curable coating composition used in the method according to the present invention may be aqueous, diluted with a solvent, or contain both a solvent or water. It is not necessary. The coating composition has high energy radiation,
Preferably, it can include those that can be completely or only partially cured by UV radiation. The high energy radiation curable coating compositions include, in particular, cationic and / or free radical curable coating compositions known to those skilled in the art. Free radical curable coating compositions are preferred. The action of high energy radiation on these coating compositions produces free radicals in the coating composition, which initiates crosslinking by free radical polymerization of olefinic double bonds.

The free-radical curable coating compositions which can preferably be used comprise conventional prepolymers such as polymers or oligomers whose molecules contain free-radical polymerizable olefinic double bonds, especially in the form of (meth) acryloyl groups. I do. These prepolymers may be present in combination with conventional reactive diluents, ie, reactive liquid monomers.

Examples of prepolymers and oligomers are (meth) acryl-functional (meth) acrylic copolymers, epoxy resins (meth) acrylates, polyester (meth)
Acrylate, polyether (meth) acrylate, polyurethane (meth) acrylate, unsaturated polyester, unsaturated polyurethane or silicone (meth)
Acrylates, which are 200 to 10,000, particularly preferably 500 to 3
It has a number average molecular weight (Mn) of 000 and an average of 2 to 20, preferably 3 to 10, free radically polymerizable olefinic double bonds per molecule. Here, (meth) acryl should be understood to mean acryl and / or methacryl.

If reactive diluents are used, they are used, for example, in an amount of 1 to 50% by weight, preferably 5 to 30% by weight, based on the total amount of prepolymer and reactive diluent.
These reactive diluents include certain low molecular weight compounds, which may be mono-, di- or polyunsaturated. Examples of such reactive diluents are: (meth)
Acrylic acid and its esters, maleic acid and its half esters, vinyl acetate, vinyl ether, substituted vinyl urea, ethylene and propylene glycol di (
(Meth) acrylate, 1,3- and 1,4-butanediol di (meth) acrylate, vinyl (meth) acrylate, allyl (meth) acrylate, glycerol tri-, di- and mono (meth) acrylate, trimethylolpropane tri -, Di- and mono (meth) acrylates, styrene, vinyltoluene, divinylbenzene, pentaerythritol tri- and tetra (meth) acrylate,
Di- and tripropylene glycol di (meth) acrylate, hexanediol di (meth) acrylate. The reactive diluents can be used individually or as a mixture. For example, diacrylates such as dipropylene glycol diacrylate, tripropylene glycol diacrylate and / or hexanediol diacrylate are preferably used as the reactive diluent.

The free-radical-curable coating composition comprises a photoinitiator, for example 0.1 to 5% by weight, based on the total amount of the free-radical-curable prepolymer, the reactive diluent and the photoinitiator.
Preferably, it is contained in an amount of 0.5 to 3% by weight. Conventional photoinitiators such as, for example, benzoin and its derivatives, acetophenone and its derivatives, anthraquinone, 1-benzoylcyclohexanol and organic phosphorus compounds such as acylphosphine oxides are suitable. The photoinitiators can be used individually or in combination. Further synergistic components can be used, for example tertiary amines.

The high energy radiation at least partially curable coating composition that can be used in the method according to the invention comprises, apart from the high energy radiation curable binder system, one or more further binders Is preferable. These additional binders which may additionally be present preferably comprise conventional binder systems which are curable by addition and / or condensation reactions. However, they can also comprise a conventional physically dry binder system or a combination of both of the above binder systems. Binder systems which are themselves curable by high-energy radiation can, in addition to the free-radically polymerizable double bonds, also have groups which can be crosslinked by addition and / or condensation reactions.

Addition and / or condensation reactions for the purposes of the present invention are lacquer chemical cross-linking reactions known to those skilled in the art, such as ring-opening addition of an epoxy group to a carboxyl group with formation of an ester group and a hydroxyl group. Addition of hydroxyl groups to isocyanate groups with formation of urethane groups, reaction of hydroxyl groups with blocked isocyanate groups with formation of urethane groups and removal of blocking agents, hydroxyl groups and N-methylol with removal of water Reaction with a group, a reaction of a hydroxyl group with removal of an esterified alcohol with an N-methylol ether group, a transesterification reaction between a hydroxyl group and an ester group with a removal of an esterified alcohol, a hydroxyl group with a removal of an alcohol Urethane exchange reaction with carbamate group, esterification A reaction such as the reaction of a carbamate group with an N-methylol ether group with the removal of coal.

The binder system preferably contains functional groups that allow crosslinking at low temperatures, for example at 20 to 80 ° C. It is particularly preferred that they contain hydroxyl and isocyanate groups. The functional groups, in particular the hydroxyl groups and the isocyanate groups, can in each case be present both in the high-energy radiation-curable binder and / or in another binder.

Polyurethane (meth) acrylates, polyester (meth) acrylates and / or (meth) acryloyl-functional poly (meth) acrylates are preferably used for clear lacquers, base lacquers or single-layer finish lacquers, while epoxy (Meth) acrylates are preferably used in surfacer layers such as intermediate layers or in further layers. Particularly good results are obtained when the above (meth) acryloyl-functional binders are combined with a binder based on a crosslinking mechanism between hydroxyl groups and isocyanate groups. Here, the hydroxyl groups and / or the isocyanate groups may be present in the (meth) acryloyl-functional binder. The only caveat is that the components containing hydroxyl groups and the components containing isocyanate groups need to be stored separately and can only be mixed together shortly before application. Particularly preferably and advantageously used binder systems comprise (meth) acryloyl- and OH-functional components and polyisocyanates, and these (
A binder system wherein the meth) acryloyl groups and the OH groups may be present in a single and / or different binder component, and comprising one or more free-radically polymerizable double bonds, A compound A) which additionally contains at least one further functional group which is reactive for the purpose of addition and / or condensation reactions, and one or more free-radically polymerizable double bonds, And / or additionally contains at least one further functional group which is reactive for the purpose of the condensation reaction, said additional further functional group supplementing or furthering the additional further functional group of component A) Binder system containing compound B), which is reactive and reactive. In the latter case, in addition to the free-radical polymerizable double bond, one having at least one functional group which is reactive for the purpose of addition and / or condensation reactions on the functional group from component A) or component B) Species or more of monomers, oligomers and / or
Alternatively, a polymeric compound may optionally be present.

The coating compositions which are at least partially curable with high-energy radiation and which can be used in the method according to the invention can contain additional ingredients customary in lacquer formulations. These can, for example, contain conventional lacquer additives. These additives include conventional additives which can be used in the field of lacquers. Examples of such additives are leveling agents, anti-cratering agents, defoamers, catalysts, coupling agents, rheological additives, thickeners, light stabilizers and emulsifiers. The additives are used in conventional amounts well known to those skilled in the art.

The coating composition that can be used in the method according to the invention can contain an organic solvent and / or a water part. Solvents include conventional industrial lacquer solvents. These may be derived from binder manufacture or added separately. Examples of such solvents are monohydric or polyhydric alcohols, such as propanol, butanol, hexanol; ethers or esters of glycols, such as diethylene glycol dialkyl ether, dipropylene glycol dialkyl ether (C1-C6, respectively).
Alkyl), ethoxypropanol, ethylene glycol monobutyl ether; glycols such as ethylene glycol, propylene glycol and oligomers thereof, such as esters such as butyl acetate and amyl acetate, N
-Methylpyrrolidone and ketones, such as methyl ethyl ketone, acetone, cyclohexanone; aromatic or aliphatic hydrocarbons, such as toluene, xylene, or linear or branched aliphatic C6-C12 hydrocarbons.

The coating composition that can be used in the method according to the present invention can contain pigments and / or extenders. These are conventional extenders which can be used in the lacquer industry, and organic or inorganic colored pigments and / or effect pigments and corrosion-resistant pigments. Examples of inorganic or organic colored pigments include titanium dioxide, micronized titanium dioxide, iron oxide pigments, carbon black, azo pigments, phthalocyanine pigments,
Quinacridone pigments and pyrrolopyrrole pigments. Examples of effect pigments are: metal pigments, such as those prepared from aluminum, copper or other metals;
Interference pigments, such as metal oxide-coated metal pigments, such as aluminum coated with titanium dioxide or mixed oxides, coated mica, such as titanium dioxide-coated mica, and pigments for the graphite effect. Examples of extenders are silicon dioxide, aluminum silicate, barium sulfate and talc. In addition to conventional additives, the coating compositions can advantageously contain specially coated extenders to increase the scratch resistance. Extenders which can be used for this purpose are, for example, micronized aluminum oxide or micronized silicon oxide. These extenders are coated with compounds having UV-curable groups, for example acrylic-functional silanes, and are therefore also involved in the radiation curing of the coating composition. Such transparent extenders which are particularly suitable for clear lacquers are available as commercial products, for example under the name of AKTISIL®.

The overall composition of the paint composition that can be used, such as the nature of the pigment, depends on which layer of the multilayer structure is to be produced with a particular paint composition, ie, for example, if it is a clear lacquer, a base lacquer or Determined by whether it consists of a surfacer or another conventional interlayer.

In the method according to the present invention, the coating composition can be applied on various substrates. Preferred substrates are metal or plastic substrates. The application in the multilayer structure is carried out in a conventional manner, preferably by spraying. The substrate may be primed, for example, a conventional primer coating may be applied to the substrate.

Once the coating composition, which is at least partially curable with high-energy radiation, is applied, the irradiation is carried out with IR radiation. I which are known to the person skilled in the art and are customary for drying lacquers
An R source can be used. The IR light source is provided before the surface of the substrate to be irradiated, for example, 20-7.
It is located at a distance of 0 cm. The duration of the IR radiation may for example be 1 to 20 minutes. Depending on the duration of the irradiation and the power of the radiation source, for example, a substrate surface temperature of 40 to 200 ° C. can be obtained. For example, it is preferable to adjust the setting so as to obtain a substrate surface temperature of 40 to 100 ° C. Particularly good results are obtained when the irradiation with IR radiation is not performed immediately after coating, but instead involves an evaporative separation stage. The evaporative separation is carried out, for example, at room temperature for 5 to 15 minutes, preferably 5 to 10 minutes.
Can last for a minute. Irradiation with high-energy radiation, preferably UV radiation, can be performed when the desired substrate surface temperature has been obtained with IR radiation, or when a predetermined irradiation duration has elapsed.

The curing of the coating which is at least partially curable with high-energy radiation, preferably with UV radiation, can preferably be carried out using a UV radiation source which emits in the wavelength range from 180 to 420 nm, in particular from 200 to 400 nm. it can. Examples of UV sources that can be used are, for example, high, medium and low pressure mercury lamps.
Lamp length can vary. Lamps 5 to 200 cm long are common. The dimensions of the lamp and the reflector can be adapted to one another by conventional means, depending on the particular application and the required radiation energy. The power of the lamp can vary, for example, between 20 and 250 W / cm (watts per cm of lamp length). 8
A lamp having an output of 0 to 120 W / cm is preferably used. The mercury lamp may optionally be doped by incorporation of a metal halide. Examples of doped light sources are iron- or gallium-mercury lamps.

Further examples of UV radiation sources are UV lamps, such as gas discharge tubes, for example low-pressure xenon lamps.
Lasers, UV point sources such as UV light emitting diodes, and dark tubes.
However, in addition to these continuously operating UV sources, discontinuous UV sources can also be used. These preferably include so-called high energy flash devices (abbreviated as UV flash lamps). UV flash lamps can have a plurality of flash tubes, for example quartz tubes, filled with an inert gas such as xenon. UV flash lamps exhibit an illuminance of for example at least 10 megalux per flash discharge, preferably 10 to 80 megalux. The energy per flash discharge may be, for example, between 1 and 10 kilojoules.

[0029] The UV radiation source is generally incorporated into a UV device, usually consisting of a UV radiation source, a reflector device, a power supply, an electrical control device, a screening, a cooling device and an ozone exhaust device. Of course, other arrangements are possible, and some of the above components may be omitted. If a UV flash lamp is used as the UV radiation source, the duration of the UV radiation can range, for example, from 1 millisecond to 400 seconds, preferably from 4 to 160 seconds, depending on the selected number of flash discharges. The flash can be activated, for example, about every four seconds. Curing can proceed, for example, by 1 to 40 sequential flash discharges.

When using a continuous UV radiation source, the irradiation duration may for example range from a few seconds to about 5 minutes, preferably less than 5 minutes. The distance between the UV radiation source and the substrate to be irradiated may be, for example, 5 to 60 cm. Screening of the UV radiation source to prevent radiation escape can be achieved, for example, by using a suitably lined protective housing around the transportable lamp unit or by other safety means known to those skilled in the art.

Once the coating composition, which is at least partially curable with high-energy radiation, is applied, the irradiation is effected firstly with IR radiation and then with high-energy radiation. Can be performed in various embodiments.

For example, the UV irradiation step may be performed once the IR irradiation step has been completed, or the UV irradiation may be started while the IR irradiation is still in progress. In the latter case, the IR irradiation step and the UV irradiation step may partially or completely overlap, ie, the IR irradiation step may end before the UV irradiation step or at the same time as its completion.

Once the UV irradiation step has been completed, it is also possible to carry out a further IR irradiation step. This subsequent IR irradiation step may be, for example, 0.5 to 30 minutes. Otherwise, what has been said above with respect to IR irradiation applies. In the case of the IR irradiation step following the UV irradiation step, irradiation can be performed sequentially in the order of IR irradiation, UV irradiation, and IR irradiation, and the IR irradiation step may be extended over the entire irradiation time, that is, IR irradiation Before, during or after UV irradiation.

The IR irradiation step and the subsequent UV irradiation step may be repeated several times as needed. In any of the above embodiments, the duration of the irradiation per irradiation cycle and the total duration of the irradiation can vary. In addition, the associated IR and UV irradiation cycles may be combined with two or more spray passes, performing two or more operations, or in two or more sequential layers of a multilayer structure. It is also possible to apply in conjunction with radiation curing.

For example, once the at least partially radiation-curable coating composition has been applied in a single spray pass, an intermediate curing can be carried out first by IR irradiation and then by UV irradiation, after which the coating composition The object is applied in one or more further spray passes, followed by an initial IR irradiation and a subsequent UV irradiation in sequence. This mode of operation is particularly advantageous for applying the desired surfacer layer film at relatively thick thicknesses, for example, up to 400 μm.

In the case of a multilayer structure, it is also possible to apply an at least partially radiation-curable base lacquer first, which is first subjected to IR irradiation and then to UV irradiation. Thereafter, an at least partially radiation-curable clear lacquer can be applied and first subjected to IR irradiation and then to UV irradiation. In both cases, additional IR irradiation can optionally be performed after UV irradiation. Here, the radiation curing of the individual layers of the multilayer structure, and of the layers applied by two or more spray passes, is in each case individually for each layer or two or more. Can be performed together at different radiation intensities and different irradiation durations.

According to the invention, the lacquered substrate surface is treated, for example, with an IR light source and a UV
By arranging the light sources next to each other, they can be switched on and off appropriately or, optionally, illuminated alternately before the substrate surface to be illuminated. It is also possible to use so-called combined light sources with IR and UV sources in a single device. In the latter case, the IR and UV lamps can be arranged alternately next to each other, for example, in the device.

One or more layers of conventional multilayer structures in automotive lacquering, which are at least partially curable with high-energy radiation, can be cured using the method according to the invention. These layers can comprise, for example, primers, surfacers, base lacquers and clear lacquers, or can comprise multilayer structures comprising primers, surfacers and single-layer finish lacquers. Here, one or more layers of the multilayer structure can be produced at least in part from a radiation-curable coating composition.

By the method according to the invention, a crack-free coating with very good adhesion to the substrate and very good interlayer adhesion is obtained. The applied coating exhibits sufficient sag resistance and, once cured, exhibits a complete visual appearance. The chemical resistance and weather resistance are very good. The resulting coating has an increased crosslink density and sufficient flexibility. Surfacer coatings produced using the method according to the invention can be very easily sanded. The following examples are intended to illustrate the invention in more detail.

Example 1 A UV-curable clear lacquer was first produced. For this purpose, the following components were mixed together and homogenized for several minutes using a high-speed stirrer: 55 g of a conventional commercial OH- and acryloyl-functional binder (Jaegalux 5)
154) 10 g of a conventional commercial polyisocyanate (Desmodur N 75) 3.8 g of a conventional arylphosphine oxide based photoinitiator (Lucir
in TPO) 0.5 g of conventional commercial leveling agent (Byketol OK) 2.5 g of butyl acetate

Manufacture of multilayer structure Surfacer layer (solvent-based binder based on two-component polyurethane)
Was applied on a metal sheet coated with anodic electrolysis so that the thickness of the obtained dry film was about 80 μm, and after a short evaporation separation period at room temperature, was cured at 60 ° C. for 30 minutes. An aqueous base lacquer (prepared according to Preparation Example 4 of DE-A-196 43 802) was applied on the surfacer layer such that the resulting dry film thickness was 13 to 15 μm. After evaporating and separating at room temperature for 20 minutes, the composition was applied so that the dry film thickness capable of obtaining a curable clear lacquer by the above-mentioned UV rays was 40 to 50 μm. After evaporating and separating at room temperature for 5 minutes, the applied clear lacquer was subjected to IR irradiation.
The irradiation time was 5 minutes. Next, UV irradiation was performed using a UV flash lamp (output: 3500 W). With 30 flashes activated at intervals of about 4 seconds,
Irradiation was performed at a distance of about 20 cm from the object.

Example 2 A method similar to that of Example 1 was used, except that UV irradiation was followed by additional IR irradiation (irradiation for 5 minutes).

COMPARATIVE EXAMPLE 1 Clear lacquer was applied once and after a 30 minute evaporative separation step at room temperature, UV
Except for direct UV irradiation using a flash lamp (output 3500W),
The same method as in Example 1 was used. UV irradiation was performed at a distance of about 20 cm from the object by 30 flashes activated at intervals of about 4 seconds.

[0044]

[Table 1]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B05D 5/00 B05D 5/00 Z 7/14 7/14 S 7/16 7/16 7/24 301 7 / 24 301T 302 302T 7/26 7/26 (72) Inventor Wolfgang Filer Federal Republic of Germany Day 50997 Cologne. Gerolsteinerstrasse 4 (72) Inventor Kurstine Kimper Germany-58332 Schwerm. Lindenbergstrasse 11 (72) Inventor Jens Zeien Germany Day 42117 Wuppertal. Hindenburg Stoase 91 F term (reference) 4D075 AA01 BB26Z BB37Z BB42Z BB46Z CA50 DA23 DA27 DB01 DC12 EA21 EA41 EA43 EB23 EB38 EC11

Claims (9)

[Claims] 1. Application of one or more surfacer layers and / or additional coating composition layers on an optionally primed substrate, followed by a base lacquer / clear lacquer finish lacquer layer or pigment addition A method of multi-layer lacquering by applying a single-layer finish lacquer, wherein at least one of the layers of the multi-layer structure is produced from a coating composition which is at least partially curable with high energy radiation. Once the coating composition, which is at least partially curable with high-energy radiation, is applied, the irradiation is first performed with IR radiation and then with high-energy radiation, the irradiation with IR radiation being followed by irradiation with high-energy radiation. A multi-layer lacquering method, characterized in that it may at least partially overlap with. 2. After applying the coating composition, which is at least partially curable with high-energy radiation, an evaporative separation step is carried out at room temperature, followed immediately by irradiation with IR radiation. The method of claim 1. 3. The method as claimed in claim 1, wherein the surfacer layer, the pigmented lacquer layer, the base layer and / or the clear lacquer layer are applied as at least partially curable layers with high-energy radiation. The method described in. 4. The coating composition according to claim 1, wherein the coating composition curable by high-energy radiation further comprises a binder system curable by an addition reaction and / or a condensation reaction. The described method. 5. The method according to claim 1, wherein said further existing binder system comprises OH-functional and NC
The method according to claim 4, characterized in that it comprises one based on an O-functional binder component. 6. The coating composition, which is curable by high-energy radiation, comprises a (meth) acryloyl-functional binder further comprising a reactive functional group.
The method according to claim 1. 7. The method according to claim 6, wherein the additional functional groups include OH groups and / or NCO groups. 8. The method according to claim 1, further comprising, after irradiation with high-energy radiation, performing IR irradiation. 9. The method according to claim 1, wherein the method is performed for lacquering a vehicle for repair.