EP1501899B1 - Method for overpainting chromophore and/or effect-producing multi-layer paints - Google Patents

Method for overpainting chromophore and/or effect-producing multi-layer paints Download PDF

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Publication number
EP1501899B1
EP1501899B1 EP03717322A EP03717322A EP1501899B1 EP 1501899 B1 EP1501899 B1 EP 1501899B1 EP 03717322 A EP03717322 A EP 03717322A EP 03717322 A EP03717322 A EP 03717322A EP 1501899 B1 EP1501899 B1 EP 1501899B1
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EP
European Patent Office
Prior art keywords
process according
film
clearcoat
aqueous basecoat
paint systems
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP03717322A
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German (de)
French (fr)
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EP1501899A1 (en
Inventor
Andreas RÜTHER
Anja Loewe
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BASF Coatings GmbH
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BASF Coatings GmbH
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Publication of EP1501899A1 publication Critical patent/EP1501899A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/574—Three layers or more the last layer being a clear coat at least some layers being let to dry at least partially before applying the next layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/005—Repairing damaged coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/577—Three layers or more the last layer being a clear coat some layers being coated "wet-on-wet", the others not

Definitions

  • the present invention relates to a novel process for repainting multicoat color and / or effect paint systems containing at least one color and / or effect basecoat (A), prepared from at least one aqueous basecoat (A), and at least one clearcoat (B) prepared from at least one liquid clearcoat (B).
  • the present invention relates to a novel process for overcoating by means of electrostatic spray application (ESTA) produced, damaged or undamaged, multicoat color and / or effect paint systems at the automobile manufacturer in the line.
  • ESA electrostatic spray application
  • EP 0 521 040 B2 is a method for producing a multi-layer refinish in the usual sense, in which one applies in the area of the damaged area in the series coating initially a pigment-free, aqueous, film-forming coating agent before the repair water-based paint is applied.
  • the coating agent may be a pigment-free extract of the repair water-based paint.
  • a clearcoat is then applied wet-on-wet to the waterborne basecoat, after which the existing coats are cured together. This process represents a significant advance in refinishing in the usual sense.
  • the known refinishing process can not solve the above-mentioned problems that occur when overpainting color and / or effect multicoat paint systems in line at the car manufacturer, because it is this very different amounts of coating materials and a very different logistics required than for the refinish in the usual sense, which is carried out especially in car paint shops.
  • the object of the present invention is to provide a novel process for recoating multicoat color and / or effect paint systems, in particular by means of electrostatic spray application (ESTA) and curing of multicoat paint systems comprising at least one color and / or effect basecoat (A) prepared from at least one Waterborne basecoat (A), and at least one clearcoat (B), prepared from at least one liquid clearcoat (B), which no longer has the disadvantages of the prior art and the pneumatically wet-in-wet applied and cured, color and / or multicoat paint systems which do not suffer any disadvantageous hue shift and / or disadvantageous change in the optical effect, in particular the metallic effect, in comparison with the original or OEM finishes.
  • ESA electrostatic spray application
  • the multicoat paint systems produced with the aid of the new process should adhere very well to OEM (OEM) finishes.
  • the new process should be especially suitable for overcoating OEM (OEM) paints by the car manufacturer, where problems quite different from those encountered in car refinishing in the usual sense occur.
  • the new process for overcoating multicoat color and / or effect varnishes comprising at least one color and / or effect basecoat (A) prepared from at least one aqueous basecoat (A), and at least one clearcoat (B) prepared from at least a liquid clearcoat (B), referred to as "inventive method”.
  • the process according to the invention is used for overpainting multicoat color and / or effect, preferably color and effect or effect, multicoat systems. This can be done for repair purposes, for example if the multi-layer coatings have been damaged by mechanical and / or chemical action. However, the overcoating can also be carried out with undamaged multi-layer coatings, for example if a change, in particular adaptation, of the hue and / or the optical effect is or are required.
  • the multicoat paint systems can provide protection, decoration, increase of scratch and abrasion resistance and corrosion resistance, improvement of cleaning performance, improvement of demolding and reduction of adhesion, generation of a Anti-fog effect, the generation of anti-reflection properties and / or increasing the bursting pressure serve. They can be used on a wide variety of substrates. These may be substrates of metal, plastic, glass, ceramics, porcelain, clay, concrete, natural stone, artificial stone, wood, paper, textile, leather and composites of these materials. Preferably, it is substrates of metal or plastic.
  • the multi-layer coatings in many technical fields, such as for the painting of motor vehicle bodies and parts thereof, motor vehicles in indoor and outdoor, indoor and outdoor buildings, doors, windows, furniture and glass hollow bodies and in the context of industrial paint for painting Small parts, coils, containers, packaging, electrical components and white goods, are used.
  • the multicoat paint systems preferably serve for the protection and decoration of motor vehicle bodies, in particular of automobile or automobile bodies.
  • the so-called automobile construction of the multicoat color and / or effect paint systems as described in US Pat Römpp Lexikon Lacke und Druckmaschine, Georg Thieme Verlag, Stuttgart, New York, 1998, page 50, "Automotive Painting” is generally defined as electrodeposition coating, primer, surfacer or antistonechip primer, basecoat and clearcoat.
  • the multicoat color and / or effect paint systems are prepared by applying a primer or filler to the electrocoated motor vehicle bodies or the attachments, which in the vast majority of cases is thermally cured on its own. At least one, in particular one, of the resulting surfacer coat or antistonechip primer is then subjected to the so-called wet-on-wet process.
  • actinic radiation electromagnetic radiation, such as near infrared (NIR), visible light, UV radiation or X-radiation, in particular UV radiation, and / or corpuscular radiation, such as electron radiation, can be used.
  • waterborne basecoat materials (A) it is possible to use all customary and known waterborne basecoat materials of the kind customarily used for the production of multicoat color and / or effect coating systems for the OEM of automobiles, in particular by the wet-on-wet process.
  • Highly suitable aqueous basecoats are known, for example, from the patent applications EP 0 089 497 A1 . EP 0 256 540 A1 . EP 0 260 447 A1 . EP 0 297 576 A1 . WO 96/12747 . EP 0 523 610 A1 . EP 0 228 003 A1 . EP0397806A1 . EP0574417A1 . EP0531510A1 . EP0581211A1 . EP 0 708 788 A1 . EP 0 593 454 A1 . DE-A-43 28 092 A1 . EP 0 299 148 A1 . EP 0 394 737 A1 .
  • they may contain at least one saturated, unsaturated and / or with olefinically unsaturated compounds grafted, ionically and / or nonionically stabilized polyurethane as a binder.
  • they may contain at least one crosslinking agent.
  • the crosslinking agent is selected from the group consisting of aminoplast resins, blocked polyisocyanates, and tris (alkoxycarbonylamino) triazines.
  • Suitable liquid clearcoats (B) for the preparation of the clearcoats are all customary and known one-component (1K), two-component (2K) or multicomponent (3K, 4K) clearcoats, powder slurry clearcoats, UV-curable clearcoats and sealers.
  • Thermally curable one-component (1K), two-component (2K) or multi-component (3K, 4K) clearcoat materials are disclosed in the patent applications DE 42 04 518 A1 .
  • EP 0 604 992 A1 or EP 0 596 460 A1 the international patent applications WO 94/10211 .
  • WO 94/10213 WO 94/22969 or WO 92/22615 or the American patents US 5,474,811 A1 .
  • One-component (1K) clearcoat materials (B), in particular solvent-containing comprise, as is known, hydroxyl-containing binders and crosslinking agents, such as blocked polyisocyanates, tris (alkoxycarbonylamino) triazines and / or aminoplast resins.
  • they contain as binders polymers with pendant carbamate and / or allophanate groups and optionally carbamate- and / or allophanate-modified aminoplast resins as crosslinking agents (cf US Pat US 5,474,811 A1 . US 5,356,669 A1 or US 5,605,965 A1 . the international patent applications WO 94/10211 . WO 94/10212 or WO 94/10213 or the European patent applications EP 0 594 068 A1 . EP 0 594 071 A1 or EP 0 594 142 A1 ).
  • Thermally curable powder slurry clearcoats are known for example from the American patent specification US 4,268,542 A1 and the German patent applications DE 195 18 392 A1 .
  • Powder slurry clearcoats (B) are known to contain powder clearcoats dispersed in an aqueous medium.
  • UV-curable clearcoats for example, from the European patent applications EP 0 928 800 A1 . EP 0 636 669 A1 . EP 0 410 242 A1 . 0 783 534 A1 . EP 0 650 978 A1 . EP 0 650 979 A1 . EP 0 650 985 A1 . EP 0 540 884 A1 . EP 0 568 967 A1 . EP 0 054 505 A1 or EP 0 002 866 A1 , the German patent applications DE 197 09 467 A1 . DE 42 03 278 A1 . DE 33 16 593 A1 . DE 38 36 370 A1 .
  • clearcoats (B) are known, which can be crosslinked thermally and with actinic radiation (see the patent applications EP 0 982 800 A1 . EP 0 844 286 A1 . WO 98/40170 and DE 199 14 896 A1 ), which is also referred to by the experts as dual cure.
  • suitable dual-cure clearcoats (B) are one-component clearcoats or two-component clearcoats which additionally contain actinic radiation-activatable functional groups and / or additional constituents with such functional groups.
  • Acrylate groups are particularly preferably used as activatable with actinic radiation functional groups.
  • suitable additional ingredients are isocyanato acrylates, urethane acrylates or multifunctional acrylates such as dipentaerythritol pentaacrylate.
  • sealers (B) are from the German patents DE 43 03 570 A1 . DE 34 07 087 A1 . DE 40 11 045 A1 . DE 40 25 215 A1 . DE 38 28 098 A1 . DE 40 20 316 A1 or DE 41 22 743 A1 known. Also suitable are organically modified ceramic materials that are marketed under the brand name ORMOCER®.
  • the outer surface of a standard finish is spray-applied by pneumatic spraying (cf. Römpp Lexikon Lacke und Druckmaschine, Georg Thieme Verlag, Stuttgart, New York, 1998, page 537, "Spray Gun” ) with at least one of opaque pigments substantially or completely free, in particular a completely pigment-free, extract from a Water-based paint, which is the aqueous basecoat (A) or one of the water-based paints (A), from or from which the basecoats (A) have been prepared, substantially identical or identical, coated.
  • OEM a standard finish
  • pneumatic spraying cf. Römpp Lexikon Lacke und Druckmaschine, Georg Thieme Verlag, Stuttgart, New York, 1998, page 537, "Spray Gun”
  • a Water-based paint which is the aqueous basecoat (A) or one of the water-based paints (A), from or from which the basecoats (A) have been prepared, substantially identical or identical, coated.
  • the waterborne basecoat is then considered to be “substantially equivalent” to the waterborne basecoat (A), if they are substantially or completely the same in their essential constituents which characterize the technological properties.
  • An excerpt i. S. of the invention is thus a coating material which contains the same or the same binder and optionally the same or the same crosslinking agent, such as the water-based paint (A) in question.
  • the concentration of the binder and optionally of the crosslinking agent in the extract may differ from or be the same as the concentration in the waterborne basecoat material (A).
  • the extracts Preferably, in the extracts lower concentrations than in the corresponding water-based paint (A) are used.
  • the extract may contain the same additives in the same or different amounts as the water base lacquer (A) in question, whereby it is possible to dispense with the use of friction resins. It is also possible to use additives other than those used in the aqueous basecoat (A).
  • substantially free of covering pigments means that the relevant extract, based on its total amount, can contain up to 20, preferably up to 10 and in particular up to 5% by weight of opacifying coloring pigments, because This is the case with the large-area overpainting of multicoat paint systems, in particular series finishes, which can facilitate color matching.
  • the extract is a Clear color which is completely free from opaque pigments and which may contain non-opaque, translucent pigments.
  • the extract is a pigment-free Klariack.
  • the extract in the sense mentioned above the water-based paint (A) or one of the water-based paints (A) corresponds, from or from which the base coat (A) of the multi-layer coating has been prepared.
  • the extract is pneumatically applied in the first process step with an injection pressure of 2.5 to 5 bar.
  • the extract is applied in a total layer thickness such that after hardening in the last process step a dry layer thickness of 2 to 50, particularly preferably 5 to 45 and in particular 5 to 40 ⁇ m results.
  • the resulting layer of the extract is flashed off in the second Versmallestyakift and / or dried, without curing it completely.
  • the waterborne basecoat is then considered to be "substantially equivalent" to the waterborne basecoat (A), if they are substantially or completely the same in their essential constituents that characterize the technological properties.
  • an injection pressure of 0.5 to 0.9 bar is applied.
  • the aqueous basecoat is applied in a total wet layer thickness, that after curing in the last process step results in a total dry layer thickness of 5 to 50, preferably 7.5 to 40 and in particular 10 to 30 microns.
  • the resulting waterborne basecoat layer is flashed off and / or dried in the next process step without completely hardening it.
  • the deaeration and / or drying of the excipient and waterborne coating layers described above can be accomplished in conventional and known catfish by increasing the temperature of the layers, passing laminar airflows over the layers, and / or reducing the atmospheric humidity of the surrounding atmosphere ,
  • the aerated and / or dried waterborne basecoat layer is coated in a further process step with at least one, in particular one, liquid clearcoat.
  • a liquid Klariack is used, which is curable thermally and / or with actinic radiation, preferably thermally or thermally and with actinic radiation.
  • varnishes which essentially correspond to the above-described aqueous or conventional, in particular conventional, one-component dialcohols (B), the Zwolkomponentenkiarlacken (B) or the Dual-Cure clearcoats (B) or with
  • the varnish and the varnish (B) are then regarded as "substantially equivalent" to each other if they are substantially or completely identical in their essential constituents which characterize the technological properties.
  • the clearcoats are very particularly preferably identical to the clearcoats (B) from which the clearcoatings (B) of the multicoat paint systems have been produced.
  • the resulting clearcoat layer (s) is / are preferably applied in a wet coating thickness such that after curing in the last process step a total dry film thickness of 10 to 100, more preferably 15 to 80, particularly preferably 20 to 70 and in particular 25 to 60 ⁇ m results ,
  • the clearcoat layer (s) are flashed off and / or dried prior to curing in the last process step in a conventional manner, and the above-described measures for accelerating the venting and / or drying can be used.
  • the resulting clearcoat layer (s), the waterborne basecoat layer and the layer from the extract, as well as any further uncured layers are cured together.
  • the layers are cured thermally or thermally and with actinic radiation, and the conventional and known methods and devices can be used.
  • the process according to the invention can be used for the voluminous overcoating of undamaged and damaged multicoat paint systems, in particular of OEM (OEM) finishes. Both damaged multi-layer coatings, the damaged areas as well as the entire adjacent area to a boundary, such as an edge or a decorative strip, over-painted.
  • OEM OEM
  • the process according to the invention is particularly economical because the same starting materials as for the water-based paints (A) themselves and for the production of secondary coatings the same waterborne basecoats (A) as for the production of multicoat paint systems are used for the preparation of the extracts of waterborne basecoats (A).
  • the economy can be further increased if the same clearcoats are used for the production of the secondary finishes as for the preparation of the clearcoats (B) of the multi-layer finishes (OEM). Overall, this can significantly simplify the storage in the paint shops.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

A process for overcoating multicoat paint systems comprising (1) applying by pneumatic spray application to the multicoat paint systems the extract, free from opaque pigments, of an aqueous basecoat material (A) or of a corresponding aqueous basecoat material, (2) flashing off and/or drying the resulting film (1) without curing it completely, (3) coating by pneumatic spray application at a reduced spraying pressure the resulting flashed off and/or dried film (2) with the aqueous basecoat material (A) or a ′ corresponding aqueous basecoat material, (4) flashing off and/or drying the resulting aqueous basecoat film (3) without curing it completely, (5) coating the resulting flashed off and/or dried aqueous basecoat film (4) with a liquid clearcoat material, and (6) jointly curing the film (1), and, where resulting clearcoat film (5), the aqueous basecoat film (4) and the appropriate, any further uncured films that are present.

Description

Die vorliegende Erfindung betrifft ein neues Verfahren zum Überlackieren farb- und/oder effektgebender Mehrschichtlackierungen, enthaltend mindestens eine farb- und/oder effektgebende Basislackierung (A), hergestellt aus mindestens einem Wasserbasislack (A), und mindestens eine Klariackierung (B), hergestellt aus mindesten einem flüssigen Klarlack (B). Insbesondere betrifft die vorliegende Erfindung ein neues Verfahren zum Überlackieren mittels elektrostatischer Spritzapplikation (ESTA) hergestellter, beschädigter oder unbeschädigter, farb-und/oder effektgebender Mehrschichtlackierungen beim Automobilhersteller in der Linie.The present invention relates to a novel process for repainting multicoat color and / or effect paint systems containing at least one color and / or effect basecoat (A), prepared from at least one aqueous basecoat (A), and at least one clearcoat (B) prepared from at least one liquid clearcoat (B). In particular, the present invention relates to a novel process for overcoating by means of electrostatic spray application (ESTA) produced, damaged or undamaged, multicoat color and / or effect paint systems at the automobile manufacturer in the line.

Bei dem Überlackieren farb- und/oder effektgebender Mehrschichtlackierungen von Kraftfahrzeugen, insbesondere von PKW, mit Reparaturlackierungen kommt es häufig zu Farbtonverschiebungen und/oder Änderungen des optischen Effekts, insbesondere des Metalliceffekts. In vielen Fällen werden diese unerwünschten Änderungen dadurch hervorgerufen, dass die Mehrschichtlackierungen, von der Fachwelt auch Originallackierungen oder Serienlackierungen (OEM) genannt, mit Hilfe der elektrostatischen Spritzapplikation (ESTA) aufgetragen werden, wogegen die Reparaturlackierungen pneumatisch appliziert werden. Die unterschiedlichen Applikationsverfahren führen nämlich zu einer unterschiedlichen Orientierung der farb- und/oder effektgebenden Pigmente in den resultierenden Basislackierungen.When overpainting multicoat color and / or effect paint systems of motor vehicles, in particular of motor vehicles, with refinishes, color shifts and / or changes in the optical effect, in particular the metallic effect, frequently occur. In many cases, these undesirable changes are caused by the fact that the multicoat paint systems, also known by experts as Original Paint or Original Equipment (OEM), are applied by means of the electrostatic spray application (ESTA), whereas the refinish coatings are applied pneumatically. The different application methods lead namely to a different orientation of the color and / or effect pigments in the resulting basecoats.

Grundsätzlich geht die Fachwelt davon aus, dass ein durch ESTA-Applikation erzeugter Farbton und/oder optischer Effekt pneumatisch nicht nachgestellt werden kann oder können.Basically, experts assume that a color tone and / or an optical effect produced by ESTA application can not or can not be adjusted pneumatically.

Um die Farbtonverschiebung und die Änderung des optischen Effekts zumindest teilweise zu verhindern, werden bei der Reparatur der Serienlackierungen (OEM) in der Linie beim Automobilhersteller konventionelle, d. h., organische Lösemittel enthaltende, Basislacke eingesetzt, die im Farbton und/oder dem optischen Effekt an die zu reparierenden Basislackierungen angepasst sind. Dieses Vorgehen ist aber sehr aufwändig, da für alle Serienfarbtöne und/oder -effekte separat ein konventioneller Basislack hergestellt und beim Automobilhersteller bevorratet werden muss.In order to at least partially prevent the hue shift and the change of the optical effect, when repairing OEM (OEM) in-line production lines, conventional, i.e., automotive, vehicle manufacturers, e.g. h., organic solvents containing basecoats used, which are adapted in color and / or the optical effect of the basecoats to be repaired. However, this procedure is very complex because a standard basecoat has to be produced separately for all series colors and / or effects and stored by the automobile manufacturer.

Aus dem europäischen Patent EP 0 521 040 B2 ist ein Verfahren zur Herstellung einer mehrschichtigen Reparaturlackierung im üblichen Sinne bekannt, bei der man im Bereich der Schadstelle in der Serienlackierung zunächst ein pigmentfreies, wässriges, filmbildendes Überzugsmittel aufträgt, bevor der Reparatur-Wasserbasislack appliziert wird. Das Überzugsmittel kann ein pigmentfreier Auszug des Reparatur-Wasserbasislacks sein. Auf die Wasserbasislackschicht wird anschließend nass-in-nass ein Klarlack aufgetragen, wonach die vorhandenen Schichten gemeinsam gehärtet werden. Dieses Verfahren stellt einen wesentlichen Fortschritt bei der Reparaturlackierung im üblichen Sinne dar.From the European patent EP 0 521 040 B2 is a method for producing a multi-layer refinish in the usual sense, in which one applies in the area of the damaged area in the series coating initially a pigment-free, aqueous, film-forming coating agent before the repair water-based paint is applied. The coating agent may be a pigment-free extract of the repair water-based paint. A clearcoat is then applied wet-on-wet to the waterborne basecoat, after which the existing coats are cured together. This process represents a significant advance in refinishing in the usual sense.

Das bekannte Reparaturlackierverfahren vermag indes nicht die angesprochenen Probleme, die beim Überlackieren farb- und/oder effektgebender Mehrschichtlackierungen in der Linie beim Automobilhersteller auftreten, zu lösen, denn es sind hierfür ganz andere Mengen an Beschichtungsstoffen und eine ganz andere Logistik erforderlich, als für die Reparaturlackierung im üblichen Sinne, die ja vor allem in Autorlackierwerkstätten durchgeführt wird.The known refinishing process, however, can not solve the above-mentioned problems that occur when overpainting color and / or effect multicoat paint systems in line at the car manufacturer, because it is this very different amounts of coating materials and a very different logistics required than for the refinish in the usual sense, which is carried out especially in car paint shops.

Aufgabe der vorliegenden Erfindung ist es, ein neues Verfahren zum Überlackieren farb- und/oder effektgebender Mehrschichtlackierungen, insbesondere mittels elektrostatischer Spritzapplikation (ESTA) und Härtung hergestellter Mehrschichtlackierungen, enthaltend mindestens eine farb- und/oder effektgebende Basislackierung (A), hergestellt aus mindestens einem Wasserbasislack (A), und mindestens eine Klarlackierung (B), hergestellt aus mindesten einem flüssigen Klarlack (B), bereitzustellen, das die Nachteile des Standes der Technik nicht mehr länger aufweist und das pneumatisch nass-in-nass applizierte und gehärtete, farb- und/oder effektgebende Mehrschichtlackierungen liefert, die gegenüber den Originallackierungen oder Serienlackierungen (OEM) keine nachteilige Farbtonverschiebung und/oder keine nachteilige Änderung des optischen Effekts, insbesondere des Metalliceffekts, erleiden. Außerdem sollen die mit Hilfe des neuen Verfahrens hergestellten Mehrschichtlackierungen sehr gut auf den Serienlackierungen (OEM) haften. Nicht zuletzt soll sich das neue Verfahren vor allem für das Überlackieren der Serienlackierungen (OEM) beim Automobilhersteller in der Linie eignen, wo ganz andere Probleme als bei der Autoreparaturlackierung im üblichen Sinne auftreten.The object of the present invention is to provide a novel process for recoating multicoat color and / or effect paint systems, in particular by means of electrostatic spray application (ESTA) and curing of multicoat paint systems comprising at least one color and / or effect basecoat (A) prepared from at least one Waterborne basecoat (A), and at least one clearcoat (B), prepared from at least one liquid clearcoat (B), which no longer has the disadvantages of the prior art and the pneumatically wet-in-wet applied and cured, color and / or multicoat paint systems which do not suffer any disadvantageous hue shift and / or disadvantageous change in the optical effect, in particular the metallic effect, in comparison with the original or OEM finishes. In addition, the multicoat paint systems produced with the aid of the new process should adhere very well to OEM (OEM) finishes. Last but not least, the new process should be especially suitable for overcoating OEM (OEM) paints by the car manufacturer, where problems quite different from those encountered in car refinishing in the usual sense occur.

Demgemäß wurde das neue Verfahren zum Überlackieren farb- und/oder effektgebender Mehrschichtlackierungen, enthaltend mindestens eine farb- und/oder effektgebende Basislackierung (A), hergestellt aus mindestens einem Wasserbasislack (A), und mindestens eine Klariackierung (B), hergestellt aus mindesten einem flüssigen Klarlack (B), gefunden, wobei man

  1. (1) auf die äußere Oberfläche der Mehrschichtlackierungen den von deckenden Pigmenten im wesentlichen oder völlig freien Auszug eines Wasserbasislacks, der dem Wasserbasislack (A) oder eine der Wasserbasislacke (A), aus dem oder aus denen die Basislacklerung (A) hergestellt worden ist, im wesentilchen entspricht oder mit diesem identisch ist, durch pneumatische Spritzapplikation mit einem Spritedruck von 2,5 bis 5 bar aufträgt,
  2. (2) die resultierende Schicht (1), ohne sie vollständig zu härten, ablüftet und/oder trocknet.
  3. (3) mit einem Wasserbasislack, der dem Wasserbasislack (A) oder einem der Wasserbasislacke (A), aus dem oder aus denen die Basislackierung (A) hergestellt worden ist, im wesentlichen entspricht oder mit diesem Identisch ist, durch pneumatische Spritzappilkation bei einem Spritzdruck von 0,3 bis 1,8 bar beschichtet,
  4. (4) die resultierende Wasserbasislackschicht (3), ohne sie vollständig zu härten, ablüftet und/oder trocknet,
  5. (5) die resultierende abgelüftete und/oder getrocknete Wasserbasislackschicht (4) mit mindestens einem Klarlack beschichtet und
  6. (6) die resultierende(n) Klariackschicht(en) (5), die Wasserbasislackachicht (4) und die Schicht (1) sowie weitere ggf. vorhandene ungehärtete Schichten gemeinsam härtet.
Accordingly, the new process for overcoating multicoat color and / or effect paint systems comprising at least one color and / or effect basecoat (A), prepared from at least one aqueous basecoat (A), and at least one clearcoat (B) prepared from at least one liquid clearcoat (B), found, wherein one
  1. (1) on the outer surface of the multi-layer coatings of the opaque pigments substantially or completely free extract of a water-based paint, the water-based paint (A) or one of the water-based paints (A), from or from which Basislacklerung (A) has been prepared, substantially corresponds or identical with this, by pneumatic spray application with a Spritesruck from 2.5 to 5 bar applies,
  2. (2) deaerating and / or drying the resulting layer (1) without fully curing it.
  3. (3) with a water-based paint substantially equivalent to or identical to the waterborne paint (A) or one of the waterborne paints (A) from which the basecoat (A) has been prepared by pneumatic spray application at an injection pressure coated from 0.3 to 1.8 bar,
  4. (4) deaerating and / or drying the resulting waterborne basecoat layer (3) without fully curing it,
  5. (5) the resulting flashed and / or dried aqueous basecoat film (4) is coated with at least one clearcoat and
  6. (6) the resulting clearcoat layer (s) (5), the aqueous basecoat layer (4) and the layer (1) as well as any other uncured layers that may be cured together.

Im Folgenden wird das neue Verfahren zum Überlackieren farb- und/oder effektgebender Mehrschichtlacklerungen, enthaltend mindestens eine farb- und/oder effektgebende Basislackierung (A), hergestellt aus mindestens einem Wasserbasislack (A), und mindestens eine Klariackierung (B), hergestellt aus mindesten einem flüssigen Klarlack (B), als »erfindungsgemäßes Verfahren« bezeichnet.In the following, the new process for overcoating multicoat color and / or effect varnishes comprising at least one color and / or effect basecoat (A) prepared from at least one aqueous basecoat (A), and at least one clearcoat (B) prepared from at least a liquid clearcoat (B), referred to as "inventive method".

Im Hinblick auf den Stand der Technik war es überraschend und für den Fachmann nicht vorhersehbar, dass die Aufgabe, die der vorliegenden Erfindung zugrunde lag, mit Hilfe des erfindungsgemäßen Verfahrens gelöst werden konnte. Insbesondere war es überraschend, dass die farb- und/oder effektgebenden Mehrschichtlackierungen, mit denen die Serienlackierungen (OEM) überlackiert wurden, sogar dann keine nachteilige Farbtonverschiebung und/oder eine nachteilige Änderung des optischen Effekts, insbesondere des Metalliceffekts, mehr zeigten, wenn die Serienlackierungen (OEM) mit Hilfe der elektrostatischen Spritzapplikation (ESTA) hergestellt worden waren. Dies bedeutete, dass die mit Hilfe der ESTA-Applikation erzeugten Farbtöne und optischen Effekte überraschenderweise entgegen der Ansicht der Fachwelt doch pneumatisch nachgestellt werden konnten. Vor allem überraschte, dass die nach dem erfindungsgemäßen Verfahren hergestellten Mehrschichtlackierungen hervorragend auf den Serienlackierungen (OEM) hafteten.In view of the prior art, it was surprising and unforeseeable for the skilled person that the object on which the present invention was based could be achieved with the aid of the method according to the invention. In particular, it was surprising that the multicoat color and / or effect paint systems with which the OEM finishes were overcoated even showed no disadvantageous hue shift and / or disadvantageous change in the optical effect, in particular the metallic effect, when the series finishes were used (OEM) using the electrostatic spray application (ESTA). This meant that the color tones and optical effects produced with the aid of the ESTA application could surprisingly be adjusted pneumatically, contrary to the opinion of the experts. Above all, it was surprising that the multicoat paint systems produced by the process according to the invention adhered excellently to the OEM (OEM) finishes.

Das erfindungsgemäße Verfahren dient dem Überlackieren von farb- und/oder effektgebenden, vorzugsweise farb- und effektgebenden oder effektgebenden, Mehrschichtlackierungen. Dies kann zu Reparaturzwecken erfolgen, beispielsweise wenn die Mehrschichtlackierungen durch mechanische und/oder chemische Einwirkung beschädigt worden sind. Die Überlackierung kann aber auch bei unbeschädigten Mehrschichtlackierungen durchgeführt werden, beispielsweise wenn eine Änderung, insbesondere Anpassung, des Farbtons und/oder des optischen Effekts erforderlich ist oder sind.The process according to the invention is used for overpainting multicoat color and / or effect, preferably color and effect or effect, multicoat systems. This can be done for repair purposes, for example if the multi-layer coatings have been damaged by mechanical and / or chemical action. However, the overcoating can also be carried out with undamaged multi-layer coatings, for example if a change, in particular adaptation, of the hue and / or the optical effect is or are required.

Die Mehrschichtlackierungen können dem Schutz, der Dekoration, der Erhöhung der Kratz- und Abriebfestigkeit und der Korrosionsbeständigkeit, der Verbesserung des Reinigungsverhaltens, der Verbesserung der Entformung und der Verringerung der Anhaftung, der Erzeugung eines Antibeschlageffekts, der Erzeugung von Antireflexeigenschaften und/oder der Erhöhung des Berstdruckes dienen. Sie können auf den unterschiedlichsten Substrate eingesetzt werden. So kann es sich um Substrate aus Metall, Kunststoff, Glas, Keramik, Porzellan, Ton, Beton, Naturstein, Kunststein, Holz, Papier, Textil, Leder und Verbunden dieser Materialien handeln. Vorzugsweise handelt es sich um Substrate aus Metall oder Kunststoff.The multicoat paint systems can provide protection, decoration, increase of scratch and abrasion resistance and corrosion resistance, improvement of cleaning performance, improvement of demolding and reduction of adhesion, generation of a Anti-fog effect, the generation of anti-reflection properties and / or increasing the bursting pressure serve. They can be used on a wide variety of substrates. These may be substrates of metal, plastic, glass, ceramics, porcelain, clay, concrete, natural stone, artificial stone, wood, paper, textile, leather and composites of these materials. Preferably, it is substrates of metal or plastic.

Demgemäß können die Mehrschichtlackierungen auf zahlreichen technischen Gebieten, wie für das Lackieren von Kraftfahrzeugkarosserien und Teilen hiervon, Kraftfahrzeugen im Innen- und Außenbereich, Bauwerken im Innen- und Außenbereich, Türen, Fenstern, Möbeln und Glashohlkörpern sowie im Rahmen der industriellen Lackierung für das Lackieren von Kleinteilen, Coils, Container, Emballagen, elektrotechnischen Bauteilen und weißer Ware, verwendet werden.Accordingly, the multi-layer coatings in many technical fields, such as for the painting of motor vehicle bodies and parts thereof, motor vehicles in indoor and outdoor, indoor and outdoor buildings, doors, windows, furniture and glass hollow bodies and in the context of industrial paint for painting Small parts, coils, containers, packaging, electrical components and white goods, are used.

Bevorzugt dienen die Mehrschichtlackierungen dem Schutz und der Dekoration von Kraftfahrzeugkarosserien, insbesondere von PKW- oder Automobilkarosserien. Der sogenannte Automobilaufbau der farb- und/oder effektgebenden Mehrschichtlackierungen, wie er in Römpp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, Seite 50, »Automobil-Lackierung« , definiert wird, besteht im allgemeinen aus Elektrotauchlackierung, Primer, Füllerlackierung oder Steinschlagschutzgrundierung, Basislackierung und Klarlackierung.The multicoat paint systems preferably serve for the protection and decoration of motor vehicle bodies, in particular of automobile or automobile bodies. The so-called automobile construction of the multicoat color and / or effect paint systems, as described in US Pat Römpp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, page 50, "Automotive Painting" is generally defined as electrodeposition coating, primer, surfacer or antistonechip primer, basecoat and clearcoat.

Die Verwendung der farb- und/oder effektgebenden Mehrschichtlackierungen als Automobilaufbau setzt die so genannte Automobilqualität voraus. Gemäß dem europäischen Patent EP 0 352 298 B1 , Seite 15, Zeile 42, bis Seite 17, Zeile 14, bedeutet dies, dass die betreffenden farb- und/oder effektgebenden Mehrschichtlackierungen

  1. (1) einen hohen Glanz,
  2. (2) eine hohe Abbildungsunterscheidbarkeit,
  3. (3) ein hohes und gleichmäßiges Deckvermögen,
  4. (4) eine einheitliche Trockenschichtdicke,
  5. (5) eine hohe Benzinbeständigkeit,
  6. (6) eine hohe Lösemittelbeständigkeit,
  7. (7) eine hohe Säurebeständigkeit,
  8. (8) eine hohe Härte,
  9. (9) eine hohe Abriebfestigkeit,
  10. (10) eine hohe Kratzfestigkeit,
  11. (11) eine hohe Schlagfestigkeit,
  12. (12) eine hohe Zwischenschichthaftung und Haftung auf dem Substrat und
  13. (13) eine hohe Witterungsstabilität und UV-Beständigkeit
aufweisen. Diese Voraussetzungen müssen nicht nur die farb- und/oder effektgebenden Mehrschichtlackierungen erfüllen, die sich auf den Kraftfahrzeugkarosserien befinden, sondern auch diejenigen, die sich auf Anbauteilen, wie Schutzbleche, Kotflügel, Türen, Kofferraumdeckel, Spoiler oder Reflektoren von Lampen, die nicht aus Metall, sondern aus Kunststoffen, insbesondere faserverstärkten Kunststoffen, SMC, (Sheet Molded Compounds) BMC (Bulk Moulded Compounds), IMC (Injection Moulded Compounds) und RIMC (Reaction Injection Moulded Compounds), hergestellt werden.The use of the multicoat color and / or effect paint systems as an automobile construction requires the so-called automobile quality. According to the European patent EP 0 352 298 B1 , Page 15, line 42, to page 17, line 14, this means that the relevant color and / or effect multicoat paint systems
  1. (1) a high gloss,
  2. (2) a high distinctiveness of image,
  3. (3) a high and uniform hiding power,
  4. (4) a uniform dry film thickness,
  5. (5) high gasoline resistance,
  6. (6) high solvent resistance,
  7. (7) a high acid resistance,
  8. (8) a high hardness,
  9. (9) high abrasion resistance,
  10. (10) a high scratch resistance,
  11. (11) high impact strength,
  12. (12) high interlayer adhesion and adhesion to the substrate and
  13. (13) High weathering stability and UV resistance
exhibit. These requirements must not only meet the color and / or effect multi-layer finishes that are on the motor vehicle bodies, but also those that are on attachments, such as fenders, fenders, doors, trunk lids, spoilers or reflectors of lamps that are not made of metal but are made of plastics, in particular fiber-reinforced plastics, SMC (sheet-molded compounds) BMC (Bulk Molded Compounds), IMC (Injection Molded Compounds) and RIMC (Reaction Injection Molded Compounds).

Bekanntermaßen werden die farb- und/oder effektgebenden Mehrschichtlackierungen hergestellt, indem man auf die elektrotauchlackierten Kraftfahrzeugkarosserien oder die Anbauteile einen Primer oder Füller appliziert, der in den allermeisten Fällen für sich selbst thermisch gehärtet wird. Auf die resultierende Füllerlackierung oder Steinschlagschutzgrundierung werden dann nach dem sogenannten Nass-in-nass-Verfahren mindestens ein, insbesondere ein, Wasserbasislack (A) und mindestens ein, insbesondere ein, flüssiger Klarlack (B) vorzugsweise durch elektrostatische Spritzapplikation (ESTA; vgl. Römpp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, Seite 186, »Elektrostatische Lackierung« , und Seite 187, »Elektrostatisches Sprühen« ) aufgetragen, wonach man die resultierenden Schichten in üblicher und bekannter Weise gemeinsam thermisch oder thermisch und mit aktinischer Strahlung härtet. Als aktinische Strahlung kann elektromagnetische Strahlung, wie nahes Infrarot (NIR), sichtbares Licht, UV-Strahlung oder Röntgenstrahlung, insbesondere UV-Strahlung, und/oder Korpuskularstrahlung, wie Elektronenstrahlung, eingesetzt werden.As is known, the multicoat color and / or effect paint systems are prepared by applying a primer or filler to the electrocoated motor vehicle bodies or the attachments, which in the vast majority of cases is thermally cured on its own. At least one, in particular one, of the resulting surfacer coat or antistonechip primer is then subjected to the so-called wet-on-wet process. Water-based paint (A) and at least one, in particular one, liquid clearcoat (B), preferably by electrostatic spray application (ESTA; Römpp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, page 186, "Electrostatic coating" , and Page 187, "Electrostatic Spraying" ), after which the resulting layers are cured together in the usual and known manner thermally or thermally and with actinic radiation. As actinic radiation, electromagnetic radiation, such as near infrared (NIR), visible light, UV radiation or X-radiation, in particular UV radiation, and / or corpuscular radiation, such as electron radiation, can be used.

Als Wasserbasislacke (A) können alle üblichen und bekannten Wasserbasislacke verwendet werden, wie sie üblicherweise für die Herstellung farb- und/oder effektgebender Mehrschichtlackierungen für die Serienlackierung (OEM) von Automobilen insbesondere nach dem Nass-in-nass-Verfahren eingesetzt werden.As waterborne basecoat materials (A), it is possible to use all customary and known waterborne basecoat materials of the kind customarily used for the production of multicoat color and / or effect coating systems for the OEM of automobiles, in particular by the wet-on-wet process.

Gut geeignete Wasserbasislacke (A) sind beispielsweise aus den Patentanmeldungen EP 0 089 497 A1 , EP 0 256 540 A1 , EP 0 260 447 A1 , EP 0 297 576 A1 , WO 96/12747 , EP 0 523 610 A1 , EP 0 228 003 A1 , EP0397806A1 , EP0574417A1 , EP0531510A1 , EP0581211A1 , EP 0 708 788 A1 , EP 0 593 454 A1 , DE-A-43 28 092 A1 , EP 0 299 148 A1 , EP 0 394 737 A1 , EP 0 590 484 A1 , EP 0 234 362 A1 , EP 0 234 361 A1 , EP 0 543 817 A1 , WO 95/14721 , EP 0 521 928 A1 , EP 0 522 420 A1 , EP 0 522 419 A1 , EP 0 649 865 A1 , EP 0 536 712 A1 , EP 0 596 460 A1 , EP 0 596 461 A1 , EP 0 584 818 A1 , EP 0 669 356 A1 , EP 0 634 431 A1 , EP 0 678 536 A1 , EP 0 354 261 A1 , EP 0 424 705 A1 , WO 97/49745 , WO 97/49747 , EP 0 401 565 A1 , EP 0 496 205 A1 , EP 0 358 979 A1 , EP 469 389 A1 , DE 24 46 442 A1 , DE 34 09 080 A1 , DE 195 47 944 A1 , DE 197 41 554.7 A1 oder EP 0 817 684 , Spalte 5, Zeilen 31 bis 45, bekannt. Vorzugsweise enthalten sie mindestens ein gesättigtes, ungesättigtes und/oder mit olefinisch ungesättigten Verbindungen gepfropftes, ionisch und/oder nichtionisch stabilisiertes Polyurethan als Bindemittel. Darüber hinaus können sie mindestens ein Vernetzungsmittel enthalten. Vorzugsweise wird das Vernetzungsmittel aus der Gruppe, bestehend aus Aminoplastharzen, blockierten Polyisocyanaten und Tris(alkoxycarbonylamino)triazinen, ausgewählt.Highly suitable aqueous basecoats (A) are known, for example, from the patent applications EP 0 089 497 A1 . EP 0 256 540 A1 . EP 0 260 447 A1 . EP 0 297 576 A1 . WO 96/12747 . EP 0 523 610 A1 . EP 0 228 003 A1 . EP0397806A1 . EP0574417A1 . EP0531510A1 . EP0581211A1 . EP 0 708 788 A1 . EP 0 593 454 A1 . DE-A-43 28 092 A1 . EP 0 299 148 A1 . EP 0 394 737 A1 . EP 0 590 484 A1 . EP 0 234 362 A1 . EP 0 234 361 A1 . EP 0 543 817 A1 . WO 95/14721 . EP 0 521 928 A1 . EP 0 522 420 A1 . EP 0 522 419 A1 . EP 0 649 865 A1 . EP 0 536 712 A1 . EP 0 596 460 A1 . EP 0 596 461 A1 . EP 0 584 818 A1 . EP 0 669 356 A1 . EP 0 634 431 A1 . EP 0 678 536 A1 . EP 0 354 261 A1 . EP 0 424 705 A1 . WO 97/49745 . WO 97/49747 . EP 0 401 565 A1 . EP 0 496 205 A1 . EP 0 358 979 A1 . EP 469 389 A1 . DE 24 46 442 A1 . DE 34 09 080 A1 . DE 195 47 944 A1 . DE 197 41 554.7 A1 or EP 0 817 684 , Column 5, lines 31 to 45, known. Preferably, they contain at least one saturated, unsaturated and / or with olefinically unsaturated compounds grafted, ionically and / or nonionically stabilized polyurethane as a binder. In addition, they may contain at least one crosslinking agent. Preferably, the crosslinking agent is selected from the group consisting of aminoplast resins, blocked polyisocyanates, and tris (alkoxycarbonylamino) triazines.

Als flüssige Klarlacke (B) zur Herstellung der Klarlackierungen kommen alle üblichen und bekannten Einkomponenten(1 K)-, Zweikomponenten(2K)- oder Mehrkomponenten(3K, 4K)-Klarlacke, Pulverslurry-Klarlacke, UV-härtbaren Klarlacke und Sealer in Betracht.Suitable liquid clearcoats (B) for the preparation of the clearcoats are all customary and known one-component (1K), two-component (2K) or multicomponent (3K, 4K) clearcoats, powder slurry clearcoats, UV-curable clearcoats and sealers.

Thermisch härtbare Einkomponenten(1K)-, Zweikomponenten(2K)- oder Mehrkomponenten(3K, 4K)-Klarlacke (B) sind aus den Patentanmeldungen DE 42 04 518 A1 , EP 0 594 068 A1 , EP 0 594 071 A1 , EP 0 594 142 A1 , EP 0 604 992 A1 oder EP 0 596 460 A1 den internationalen Patentanmeldungen WO 94/10211 , WO 94/10212 , WO 94/10213 , WO 94/22969 oder WO 92/22615 oder den amerikanischen Patentschriften US 5,474,811 A1 , US 5,356,669 A1 oder US 5,605,965 A1 bekannt.Thermally curable one-component (1K), two-component (2K) or multi-component (3K, 4K) clearcoat materials (B) are disclosed in the patent applications DE 42 04 518 A1 . EP 0 594 068 A1 . EP 0 594 071 A1 . EP 0 594 142 A1 . EP 0 604 992 A1 or EP 0 596 460 A1 the international patent applications WO 94/10211 . WO 94/10212 . WO 94/10213 . WO 94/22969 or WO 92/22615 or the American patents US 5,474,811 A1 . US 5,356,669 A1 or US 5,605,965 A1 known.

Einkomponenten(1K)-Klarlacke (B), insbesondere lösemittelhaltige, enthalten bekanntermaßen hydroxylgruppenhaltige Bindemittel und Vernetzungsmittel, wie blockierte Polyisocyanate, Tris(alkoxycarbonylamino)triazine und/oder Aminoplastharze. In einer weiteren Variante enthalten sie als Bindemittel Polymere mit seitenständigen Carbamat- und/oder Allophanatgruppen und gegebenenfalls carbamat- und/oder allophanatmodifizerte Aminoplastharze als Vernetzungsmittel (vgl. die amerikanischen Patentschriften US 5,474,811 A1 , US 5,356,669 A1 oder US 5,605,965 A1 , die internationalen Patentanmeldungen WO 94/10211 , WO 94/10212 oder WO 94/10213 oder die europäischen Patentanmeldungen EP 0 594 068 A1 , EP 0 594 071 A1 oder EP 0 594 142 A1 ).One-component (1K) clearcoat materials (B), in particular solvent-containing, comprise, as is known, hydroxyl-containing binders and crosslinking agents, such as blocked polyisocyanates, tris (alkoxycarbonylamino) triazines and / or aminoplast resins. In a further variant, they contain as binders polymers with pendant carbamate and / or allophanate groups and optionally carbamate- and / or allophanate-modified aminoplast resins as crosslinking agents (cf US Pat US 5,474,811 A1 . US 5,356,669 A1 or US 5,605,965 A1 . the international patent applications WO 94/10211 . WO 94/10212 or WO 94/10213 or the European patent applications EP 0 594 068 A1 . EP 0 594 071 A1 or EP 0 594 142 A1 ).

Zweikomponenten(2K)- oder Mehrkomponenten(3K, 4K)-Klarlacke (B), insbesondere lösemittelhaltige, enthalten als wesentliche Bestandteile bekanntermaßen hydroxylgruppenhaltige Bindemittel und Polyisocyanate als Vernetzungsmittel, welche bis zu ihrer Verwendung getrennt gelagert werden.Two-component (2K) or multi-component (3K, 4K) clearcoat materials (B), in particular solvent-containing, contain, as essential constituents, hydroxyl-containing binders and polyisocyanates as crosslinking agents, which are stored separately until they are used.

Thermisch härtbare Pulverslurry-Klarlacke (B) sind beispielsweise aus der amerikanischen Patentschrift US 4,268,542 A1 und den deutschen Patentanmeldungen DE 195 18 392 A1 , DE 198 14 471 A1 und DE 196 13 547 A1 bekannt.Thermally curable powder slurry clearcoats (B) are known for example from the American patent specification US 4,268,542 A1 and the German patent applications DE 195 18 392 A1 . DE 198 14 471 A1 and DE 196 13 547 A1 known.

Pulverslurry-Klarlacke (B) enthalten bekanntermaßen Pulverklarlacke in einem wäßrigen Medium dispergiert.Powder slurry clearcoats (B) are known to contain powder clearcoats dispersed in an aqueous medium.

UV-härtbare Klarlacke (B) gehen beispielsweise aus den europäischen Patentanmeldungen EP 0 928 800 A1 , EP 0 636 669 A1 , EP 0 410 242 A1 , 0 783 534 A1 , EP 0 650 978 A1 , EP 0 650 979 A1 , EP 0 650 985 A1 , EP 0 540 884 A1 , EP 0 568 967 A1 , EP 0 054 505 A1 oder EP 0 002 866 A1 , den deutschen Patentanmeldungen DE 197 09 467 A1 , DE 42 03 278 A1 , DE 33 16 593 A1 , DE 38 36 370 A1 , DE 24 36 186 A1 oder DE 20 03 579B1 , den internationalen Patentanmeldungen WO 97/46549 oder WO 99/14254 oder den amerikanischen Patentschriften US 5,824,373 A1 , US 4,675,234 A1 , US 4,634,602 A1 , US 4,424,252 A1 , US 4,208,313 A1 , US 4,163,810 A1 , US 4,129,488 A1 , US 4,064,161 A1 oder US 3,974,303 A1 hervor.UV-curable clearcoats (B), for example, from the European patent applications EP 0 928 800 A1 . EP 0 636 669 A1 . EP 0 410 242 A1 . 0 783 534 A1 . EP 0 650 978 A1 . EP 0 650 979 A1 . EP 0 650 985 A1 . EP 0 540 884 A1 . EP 0 568 967 A1 . EP 0 054 505 A1 or EP 0 002 866 A1 , the German patent applications DE 197 09 467 A1 . DE 42 03 278 A1 . DE 33 16 593 A1 . DE 38 36 370 A1 . DE 24 36 186 A1 or DE 20 03 579B1 , the international patent applications WO 97/46549 or WO 99/14254 or the American patents US 5,824,373 A1 . US 4,675,234 A1 . US 4,634,602 A1 . US 4,424,252 A1 . US 4,208,313 A1 . US 4,163,810 A1 . US 4,129,488 A1 . US 4,064,161 A1 or US 3,974,303 A1 out.

Des weiteren sind Klarlacke (B) bekannt, die thermisch und mit aktinischer Strahlung vernetzt werden können (vgl. die Patentanmeldungen EP 0 982 800 A1 , EP 0 844 286 A1 , WO 98/40170 und DE 199 14 896 A1 ), was von der Fachwelt auch als Dual Cure bezeichnet wird. Beispiele geeigneter Dual-Cure-Klarlacke (B) sind Einkomponentenklarlacke oder Zweikomponentenklarlacke, die zusätzlich mit aktinischer Strahlung aktivierbare funktionelle Gruppen und/oder zusätzliche Bestandteile mit solchen funktionellen Gruppen enthalten. Besonders bevorzugt werden Acrylatgruppen als mit aktinischer Strahlung aktivierbare funktionelle Gruppen eingesetzt. Beispiele geeigneter zusätzlicher Bestandteile sind lsocyanatoacrylate, Urethanacrylate oder multifunktionelle Acrylate, wie Dipentaerythritpentaacrylat.Furthermore, clearcoats (B) are known, which can be crosslinked thermally and with actinic radiation (see the patent applications EP 0 982 800 A1 . EP 0 844 286 A1 . WO 98/40170 and DE 199 14 896 A1 ), which is also referred to by the experts as dual cure. Examples of suitable dual-cure clearcoats (B) are one-component clearcoats or two-component clearcoats which additionally contain actinic radiation-activatable functional groups and / or additional constituents with such functional groups. Acrylate groups are particularly preferably used as activatable with actinic radiation functional groups. Examples of suitable additional ingredients are isocyanato acrylates, urethane acrylates or multifunctional acrylates such as dipentaerythritol pentaacrylate.

Beispiele geeigneter Sealer (B) sind aus den deutschen Patentschriften DE 43 03 570 A1 , DE 34 07 087 A1 , DE 40 11 045 A1 , DE 40 25 215 A1 , DE 38 28 098 A1 , DE 40 20 316 A1 oder DE 41 22 743 A1 bekannt. Geeignet sind auch organisch modifizierte Keramikmaterialien, die unter dem Markennamen ORMOCER® vertrieben werden.Examples of suitable sealers (B) are from the German patents DE 43 03 570 A1 . DE 34 07 087 A1 . DE 40 11 045 A1 . DE 40 25 215 A1 . DE 38 28 098 A1 . DE 40 20 316 A1 or DE 41 22 743 A1 known. Also suitable are organically modified ceramic materials that are marketed under the brand name ORMOCER®.

Besonders bevorzugt werden konventionelle Einkomponentenklarlacke (B), Zweikomponentenklarlacke (B) und Dual-Cure-Klarlacke (B) verwendet.Particular preference is given to the use of conventional one-component clearcoats (B), two-component clearcoats (B) and dual-cure clearcoats (B).

Bei dem erfindungsgemäßen Verfahren wird im ersten Verfahrensschritt, gegebenenfalls nach einer Vorbereitung der vorhandenen Schadstelle oder Schadstellen durch Reinigen und/oder Schleifen, die äußere Oberfläche einer Serienlackierung (OEM) durch pneumatische Spritzapplikation (vgl. Römpp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, Seite 537, »Spritzpistole« ) mit mindestens einem von deckenden Pigmenten im wesentlichen oder völlig freien, insbesondere einem völlig pigmentfreien, Auszug aus einem Wasserbasislack, der dem Wasserbasislack (A) oder einem der Wasserbasislacke (A), aus dem oder aus denen die Basislackierungen (A) hergestellt worden sind, im wesentlichen entspricht oder mit diesem identisch ist, beschichtet.In the method according to the invention, in the first method step, if appropriate after preparation of the existing damaged area or damaged areas by cleaning and / or grinding, the outer surface of a standard finish (OEM) is spray-applied by pneumatic spraying (cf. Römpp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, page 537, "Spray Gun" ) with at least one of opaque pigments substantially or completely free, in particular a completely pigment-free, extract from a Water-based paint, which is the aqueous basecoat (A) or one of the water-based paints (A), from or from which the basecoats (A) have been prepared, substantially identical or identical, coated.

Der Wasserbasislack wird dann als dem Wasserbasislack (A) »im wesentlichen entsprechend« angesehen, wenn sie beide in den wesentlichen Bestandteilen, die die technologischen Eigenschaften prägen, im wesentlichen oder völlig übereinstimmen.The waterborne basecoat is then considered to be "substantially equivalent" to the waterborne basecoat (A), if they are substantially or completely the same in their essential constituents which characterize the technological properties.

Ein Auszug i. S. der Erfindung ist somit ein Beschichtungsstoff, der dasselbe oder dieselben Bindemittel sowie gegebenenfalls dasselbe oder dieselben Vernetzungsmittel, wie der betreffende Wasserbasislack (A) enthält. Die Konzentration der Bindemittel sowie gegebenenfalls der Vernetzungsmittel im Auszug kann sich von der Konzentration im zu Grunde liegenden Wasserbasislack (A) unterscheiden oder gleich sein. Vorzugsweise werden in den Auszügen geringere Konzentrationen als im entsprechenden Wasserbasislack (A) angewandt. Außerdem kann der Auszug dieselben Additive in denselben oder in unterschiedlichen Mengen wie der betreffende Wasserbasislack (A) enthalten, wobei auf die Verwendung von Reibharzen verzichtet werden kann. Es können auch andere Additive als die im Wasserbasislack (A) eingesetzten verwendet werden.An excerpt i. S. of the invention is thus a coating material which contains the same or the same binder and optionally the same or the same crosslinking agent, such as the water-based paint (A) in question. The concentration of the binder and optionally of the crosslinking agent in the extract may differ from or be the same as the concentration in the waterborne basecoat material (A). Preferably, in the extracts lower concentrations than in the corresponding water-based paint (A) are used. In addition, the extract may contain the same additives in the same or different amounts as the water base lacquer (A) in question, whereby it is possible to dispense with the use of friction resins. It is also possible to use additives other than those used in the aqueous basecoat (A).

Im Rahmen der vorliegenden Erfindung bedeutet »von deckenden Pigmenten im wesentlichen frei«, dass der betreffende Auszug, bezogen auf seine Gesamtmenge, bis zu 20, vorzugsweise bis zu 10 und insbesondere bis zu 5 Gew.-% an deckenden farbgebenden Pigmente enthalten kann, weil dies bei der großflächigen Überlackierung von Mehrschichtlackierungen, insbesondere Serienlackierungen, die Farbtonangleichung erleichtern kann. Bevorzugt ist aber der Auszug ein von deckenden Pigmenten völlig freier Klariack, der nicht deckende, lasierende Pigmente enthalten kann. Insbesondere ist der Auszug ein pigmentfreier Klariack.In the context of the present invention, "substantially free of covering pigments" means that the relevant extract, based on its total amount, can contain up to 20, preferably up to 10 and in particular up to 5% by weight of opacifying coloring pigments, because This is the case with the large-area overpainting of multicoat paint systems, in particular series finishes, which can facilitate color matching. Preferably, however, the extract is a Clear color which is completely free from opaque pigments and which may contain non-opaque, translucent pigments. In particular, the extract is a pigment-free Klariack.

Für die vorliegende Erfindung ist es wesentlich, dass der Auszug im vorstehend genannten Sinn dem Wasserbasislack (A) oder einem der Wasserbasislacke (A) entspricht, aus dem oder aus denen die Basislacklerung (A) der Mehrschichtlackierung hergestellt worden ist.For the present invention, it is essential that the extract in the sense mentioned above the water-based paint (A) or one of the water-based paints (A) corresponds, from or from which the base coat (A) of the multi-layer coating has been prepared.

Der Auszug wird im ersten Verfahrenschritt mit einem Spritzdruck von 2,5 bis 5 bar pneumatisch appliziert. Bevorzugt wird der Auszug in einer Gesamtschichtdicke aufgetragen, dass nach der Härtung im letzten Verfahrenschritt eine Trockenschichtdicke von 2 bis 50, besonders bevorzugt 5 bis 45 und Insbesondere 5 bis 40 µm resultiert.The extract is pneumatically applied in the first process step with an injection pressure of 2.5 to 5 bar. Preferably, the extract is applied in a total layer thickness such that after hardening in the last process step a dry layer thickness of 2 to 50, particularly preferably 5 to 45 and in particular 5 to 40 μm results.

Die resultierende Schicht aus dem Auszug wird im zweiten Verfahrermehrift abgelüftet und/oder getrocknet, ohne sie dabei vollständig zu härten.The resulting layer of the extract is flashed off in the second Verfahrermehrift and / or dried, without curing it completely.

Erfindungsgemäß wird die abgelüftete und/oder getrocknete Schicht im weiteren Verlauf des arfindungsgomäßen Verfahrens mit einem Wasserbasislack, der dem Wasserbasislack oder einem der Wasserbasislacke (A), aus dem oder aus denen die Basislacklerung (A) hergestellt worden ist, im wesentilchen entspricht oder mit diesem identisch ist, durch pneumatische Spritzapplikation bai einem reduzierten Sptrizdruck beschichtet. Der Wasserbasislack wird dann als dem Wasserbasistack (A) »im wesentlichen entsprechend« angesehen, wenn sie beide in den wesentlichen Bestandteilen, die die technologischen Eigenschaften prägen, im wesentlichen oder völlig übereinstimmen.According to the invention, the aerated and / or dried layer in the further course of the process according to the invention with a water-based paint, the waterborne basecoat or one of the aqueous basecoat (A), from or from which the basecoat (A) has been prepared, substantially or with this is identical, coated by pneumatic spray application bai a reduced Spyrizdruck. The waterborne basecoat is then considered to be "substantially equivalent" to the waterborne basecoat (A), if they are substantially or completely the same in their essential constituents that characterize the technological properties.

Vorzugsweise wird ein Spritzdruck von 0,5 bis 0,9 bar angewandt.Preferably, an injection pressure of 0.5 to 0.9 bar is applied.

Vorzugsweise wird der Wasserbasislack in einer Gesamtnassschichtdicke appliziert, dass nach der Aushärtung im letzten Verfahrenschritt eine Trockenschichtdicke von insgesamt 5 bis 50, bevorzugt 7,5 bis 40 und Insbesondere 10 bis 30 µm resultiert.Preferably, the aqueous basecoat is applied in a total wet layer thickness, that after curing in the last process step results in a total dry layer thickness of 5 to 50, preferably 7.5 to 40 and in particular 10 to 30 microns.

Die resultierende Wasserbasislackschicht wird im nächsten Verfahrenschritt abgelüftet und/oder getrocknet, ohne sie dabei vollständig zu härtern.The resulting waterborne basecoat layer is flashed off and / or dried in the next process step without completely hardening it.

Die Ablüftung und/oder Trocknung der vorstehend beschriebenen Schichten aus dem Auszug und dem Wasserbasislack können in üblicher und bekannter Welse durch eine Erhöhung der Temperatur der Schichten, das Überielten laminarer Luftströmungen über die Schichten und/oder durch die Reduzierung der Luftfsuchtigkeit der umgebenden Atmosphäre beschlsunigt werden.The deaeration and / or drying of the excipient and waterborne coating layers described above can be accomplished in conventional and known catfish by increasing the temperature of the layers, passing laminar airflows over the layers, and / or reducing the atmospheric humidity of the surrounding atmosphere ,

Erfindungsgemäß wird die abgelüftete und/oder getrocknete Wasserbasislackschicht in einem weiteren Verfahrenschritt mit mindestens einem, insbesondere einem, flüssigen Klariack beschichtet.According to the invention, the aerated and / or dried waterborne basecoat layer is coated in a further process step with at least one, in particular one, liquid clearcoat.

Vorzugsweise wird ein flüssiger Klariack verwendet, der thermisch und/oder mit aktinischer Strahlung, Vorzugsweise thermisch oder thermisch und mit aktinischer Strahlung härtbar ist. Besonders bevorzugt werden Klariacke eingesetzt, die den vorstehend beschriebenen, wässrigen oder konventionellen, insbesondere konventionellen, Einkomponentenkialacken (B), den Zwelkomponentenkiarlacken (B) oder den Dual-Cure-Klarlacken (B) im wesentliche entsprechen oder mit diesen identisch sind, Die Klariacke und die Klariacke (B) werden dann als einander »im wesentlichen entsprechend« angesehen, wenn sie in ihren wesentlichen Bestandtellen, die die technologischen Eigenschaften prägen, im wesentlichen oder völlig übereinstimmen. Ganz besonders bevorzugt sind die Klarlacke identisch mit den Klariacken (B), aus denen die Klariacklerungen (B) der Mehrschichtlackierungen hergestellten worden sind.Preferably, a liquid Klariack is used, which is curable thermally and / or with actinic radiation, preferably thermally or thermally and with actinic radiation. Particular preference is given to using varnishes which essentially correspond to the above-described aqueous or conventional, in particular conventional, one-component dialcohols (B), the Zwolkomponentenkiarlacken (B) or the Dual-Cure clearcoats (B) or with The varnish and the varnish (B) are then regarded as "substantially equivalent" to each other if they are substantially or completely identical in their essential constituents which characterize the technological properties. The clearcoats are very particularly preferably identical to the clearcoats (B) from which the clearcoatings (B) of the multicoat paint systems have been produced.

Vorzugsweise wird oder werden die resultierende(n) Klariackschicht(en) in einer Gessamtnassschichtdicke aufgetragen, dass nach der Härtung im letzten Verfahrenschritt eine Gesamttrockenschichtdicke von 10 bis 100, besonders bevorzugt 15 bis 80, besonders bevorzugt 20 bis 70 und Insbesondere 25 bis 60 µm resultiert. Vorzugsweise wird oder werden die Klarlackschicht(en) vor der Härtung im letzten Verfahrenschritt in üblicher und bekannter Weise abgelüftet und/oder getrocknet, wobei die vorstehend beschriebenen Maßnahmen zur Beschleunigung der Ablüftung und/oder Trocknung angewandt werden können.The resulting clearcoat layer (s) is / are preferably applied in a wet coating thickness such that after curing in the last process step a total dry film thickness of 10 to 100, more preferably 15 to 80, particularly preferably 20 to 70 and in particular 25 to 60 μm results , Preferably, the clearcoat layer (s) are flashed off and / or dried prior to curing in the last process step in a conventional manner, and the above-described measures for accelerating the venting and / or drying can be used.

Erfindungsgemäß worden im letzten Verfahrenschritt die resultierende(n) Klariackschicht(en), die Wasserbasislackschicht und die Schicht aus dem Auszug sowie weitere ggf. vorhandene ungehärtete Schichten gemeinsam gehärtet. Vorzugsweise werden die Schichten thermisch oder thermisch und mit aktinischer Strahlung gehärtet, wobei die übliche und bekannten Verfahren und Vorrichtungen angewandt werden können.According to the invention, in the last process step, the resulting clearcoat layer (s), the waterborne basecoat layer and the layer from the extract, as well as any further uncured layers, are cured together. Preferably, the layers are cured thermally or thermally and with actinic radiation, and the conventional and known methods and devices can be used.

Das erfindungsgemäße Verfahren kann zur volflächigen Überlackierung von unbeschädigten und beschädigten Mehrschichtlackierungen, insbesondere von Serlenlackierungen (OEM), verwendet werden. Bei den beschädigten Mehrschichtlackierungen werden die Schadstellen sowie der gesamte angrenzende Bereich bis zu einer Begrenzung, wie eine Kante oder ein Zierstreifen, überlackiert.The process according to the invention can be used for the voluminous overcoating of undamaged and damaged multicoat paint systems, in particular of OEM (OEM) finishes. Both damaged multi-layer coatings, the damaged areas as well as the entire adjacent area to a boundary, such as an edge or a decorative strip, over-painted.

Die resultierenden Zweitlackierungen haften hervorragend auf den Mehrschichtlackierungen und weisen keine unerwünschten Farbtonverschiebungen und/oder Änderungen der optischen Effekte, insbesondere der Metalliceffekte, auf. Darüber hinaus ist das erfindungsgemäße Verfahren besonders wirtschaftlich, weil für die Herstellung der Auszüge der Wasserbasislacke (A) dieselben Ausgangsstoffe wie für die Wasserbasislacke (A) selbst und für die Herstellung der Zweitlackierungen dieselben Wasserbasislacke (A) wie für die Herstellung der Mehrschichtlackierungen eingesetzt werden. Die Wirtschaftlichkeit kann noch weiter gesteigert werden, wenn für die Herstellung der Zweitlackierungen dieselben Klarlacke wie für die Herstellung der Klarlackierungen (B) der Mehrschichtlackierungen (OEM) verwendet werden. Insgesamt kann dadurch die Lagerhaltung in den Lackierbetrieben signifikant vereinfacht werden.The resulting secondary coatings adhere well to the multi-layer coatings and have no unwanted color shifts and / or changes in the optical effects, in particular the metallic effects on. In addition, the process according to the invention is particularly economical because the same starting materials as for the water-based paints (A) themselves and for the production of secondary coatings the same waterborne basecoats (A) as for the production of multicoat paint systems are used for the preparation of the extracts of waterborne basecoats (A). The economy can be further increased if the same clearcoats are used for the production of the secondary finishes as for the preparation of the clearcoats (B) of the multi-layer finishes (OEM). Overall, this can significantly simplify the storage in the paint shops.

Claims (20)

  1. Process for overcoating multicoat color and/or effect paint systems comprising at least one color and/or effect basecoat (A) produced from at least one aqueous basecoat material (A) and at least one clearcoat (B) produced from at least one liquid clearcoat material (B), which comprises
    (1) applying to the outer surface of the multicoat paint systems by pneumatic spray application with a spraying pressure of from 2.5 to 5 bar the extract of an aqueous basecoat material, substantially or entirely free from opaque pigments, which substantially corresponds or is identical to the aqueous basecoat material (A) or one of the aqueous basecoat materials (A) from which the basecoat (A) was produced,
    (2) flashing off and/or drying the resulting film (1) without curing it completely,
    (3) coating the resulting flashed off and/or dried film (2) by pneumatic spray application at a spraying pressure of from 0.3 to 1.8 bar with an aqueous basecoat material which substantially corresponds or is identical to the aqueous basecoat material (A) or one of the aqueous basecoat materials (A) from which the basecoat (A) was produced,
    (4) flashing off and/or drying the resulting aqueous basecoat film (3) without curing it completely,
    (5) coating the resulting flashed off and/or dried aqueous basecoat film (4) with at least one liquid clearcoat material, and
    (6) jointly curing the resulting clearcoat film(s) (5), the aqueous basecoat film (4) and the film (1), and, where appropriate, any further uncured films that are present.
  2. Process according to Claim 1, characterized in that the multicoat paint systems were produced by means of wet on wet techniques.
  3. Process according to Claim 1 or 2, characterized in that the multicoat paint systems were produced by means of electrostatic spray application (ESTA).
  4. Process according to any of Claims 1 to 3, characterized in that the whole area of the multicoat paint systems is overcoated.
  5. Process according to any of Claims 1 to 4, characterized in that the multicoat paint systems are overcoated at the defect(s) and also in the entire adjacent area up to a boundary.
  6. Process according to any of Claims 1 to 5, characterized in that prior to step (1) the defect(s) is (are) prepared by cleaning and/or abrading.
  7. Process according to any of Claims 1 to 6, characterized in that the aqueous basecoat material (A) and its extract or an extract substantially corresponding to it comprise at least one ionically and/or nonionically stabilized polyurethane binder which is saturated, unsaturated and/or grafted with olefinically unsaturated compounds.
  8. Process according to Claim 7, characterized in that the aqueous basecoat material (A) and its extract or an extract substantially corresponding to it comprise at least one crosslinking agent.
  9. Process according to Claim 8, characterized in that the crosslinking agent(s) is (are) selected from the group consisting of amino resins, blocked polyisocyanates, and tris(alkoxycarbonylamino)-triazines.
  10. Process according to any of Claims 1 to 9, characterized in that the extract is completely free from pigments.
  11. Process according to any of Claims 1 to 10, characterized in that the film (1) in step (1) is applied in a total wet film thickness such that curing thereof in step (6) results in a dry film thickness of from 2 to 50 µm.
  12. Process according to any of Claims 1 to 11, characterized in that the flashing off and/or drying of the film (1) in step (2) and/or of the film (3) in step (4) is/are accelerated by raising the temperature of the films (1) and/or (3), passing a laminar air flow over the films (1) and/or (3) and/or reducing the humidity in the ambient atmosphere.
  13. Process according to any of Claims 1 to 12, characterized in that the clearcoat material or materials in step (5) is or are applied with a spraying pressure of from 2.5 to 5 bar.
  14. Process according to any of Claims 1 to 13, characterized in that the clearcoat film(s) applied in step (5) is (are) flashed off prior to curing in step (6).
  15. Process according to any of Claims 1 to 14, characterized in that the clearcoat materials used comprise conventional one-component clearcoat materials, two-component clearcoat materials or dual-cure clearcoat materials.
  16. Process according to any of Claims 1 to 15, characterized in that the clearcoat materials correspond substantially or are identical to the clearcoat materials (B) from which the clearcoats (B) of the multicoat paint systems were produced.
  17. Process according to any of Claims 1 to 16, characterized in that the one-component clearcoat materials comprise hydroxyl-containing binders and blocked polyisocyanate, tris(alkoxycarbonylamino)-triazine and/or amino resin crosslinking agents or comprise as binders polymers containing pendant carbamate and/or allophanate groups and amino resin crosslinking agents, the two-component clearcoat materials comprise hydroxyl-containing binders and polyisocyanates, and the dual-cure clearcoat materials are one-component clearcoat materials or two-component clearcoat materials which additionally contain functional groups which can be activated with actinic radiation and/or additional constituents containing such functional groups.
  18. Process according to any of Claims 1 to 17, characterized in that the multicoat paint systems are the OEM finishes on motor vehicles.
  19. Process according to Claim 18, characterized in that the motor vehicles are automobiles.
  20. Process according to any of Claims 1 to 19, characterized in that it is carried out on the line at the automaker's plant.
EP03717322A 2002-05-08 2003-04-28 Method for overpainting chromophore and/or effect-producing multi-layer paints Expired - Lifetime EP1501899B1 (en)

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DE10220414 2002-05-08
DE10220414A DE10220414B4 (en) 2002-05-08 2002-05-08 Process for repainting color and / or effect multicoat paint systems
PCT/EP2003/004392 WO2003095566A1 (en) 2002-05-08 2003-04-28 Method for overpainting chromophore and/or effect-producing multi-layer paints

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DE50312053D1 (en) 2009-12-03
JP2005524530A (en) 2005-08-18
EP1501899A1 (en) 2005-02-02
ATE446343T1 (en) 2009-11-15
AU2003222311A1 (en) 2003-11-11
US20050129871A1 (en) 2005-06-16
US7763322B2 (en) 2010-07-27
JP4891542B2 (en) 2012-03-07
DE10220414B4 (en) 2005-09-22
PL374256A1 (en) 2005-10-03
KR20050004835A (en) 2005-01-12
DE10220414A1 (en) 2003-11-27

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