Coating processes – Applying superposed diverse coating or coating a coated base – Synthetic resin coating
Patent
1999-05-17
2000-12-26
Meeks, Timothy
Coating processes
Applying superposed diverse coating or coating a coated base
Synthetic resin coating
427553, 427535, B05D 136, H05H 100
Patent
active
061655619
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/EP97/04702 filed Sep. 3, 1997 which designated the U.S.
This invention relates to a process for the production of a multilayer lacquer coating on a substrate having an autophoretically coatable metallic surface.
High quality automotive original lacquer coatings are today generally produced by electrophoretic deposition of a primer providing corrosion protection on an unfinished vehicle body which is generally provided with a conversion layer, followed by spray application of subsequent layers, for example consisting of a surfacer layer and a subsequently applied decorative lacquer coating comprising a colouring and/or effect base lacquer layer and a protective clear lacquer layer which seals the surface. The conversion layer on the uncoated vehicle bodies is produced by chemical pretreatment, generally comprising phosphating and passivation, which involves considerable cost.
Lacquer coating of metallic substrates by autophoretic deposition of a coat of an autophoretically depositable coating composition is known as an electroless coating process which provides good corrosion protection results even when costly pretreatment is not performed, i.e. when the production of conversion layers, for example by phosphating and passivation, is omitted.
Direct overcoating of a coat produced by autophoretic deposition with one or more lacquer layers gives rises to multilayer lacquer coatings which have only slight adhesion and do not meet the requirements applicable to automotive original lacquer coatings.
The object of the present invention is to provide a process for the production of multilayer lacquer coatings, in particular automotive lacquer coatings, which have an autophoretically deposited lacquer layer as the primer. The autophoretically deposited coating is intended to replace the conventional electrocoated primer and the lacquer layers applied on the autophoretically deposited priming coat are intended to have good adhesion which in particular meets the elevated requirements of automotive original lacquer coating.
It has been found that this object may surprisingly be achieved by a process for the production of a multilayer lacquer coating on a substrate having an autophoretically coatable, metallic surface, in which a first priming coat of an autophoretically depositable coating composition is autophoretically deposited and then stoved and one or more subsequent coats are then applied by spraying, characterised in that the autophoretically depositable coating composition contains one or more constituents having an adhesion promoting action and/or that before one or more further coats are applied by spraying, the stoved priming layer produced by autophoretic deposition is physically and/or chemically treated and/or provided with an adhesion promoting coat.
A first embodiment of the present invention comprises a process for the production of a multilayer lacquer coating on a substrate having an autophoretically coatable, metallic surface, in which a first priming coat of an autophoretically depositable coating composition is autophoretically deposited and then stoved and one or more subsequent coats are then applied by spraying, characterised in that the autophoretically depositable coating composition contains one or more constituents having an adhesion promoting action.
A second embodiment of the present invention comprises a process for the production of a multilayer lacquer coating on a substrate having an autophoretically coatable, metallic surface, in which a first priming coat of an autophoretically depositable coating composition is autophoretically deposited and then stoved and one or more subsequent coats are then applied by spraying, characterised in that before one or more further coats are applied by spraying, the stoved priming layer produced by autophoretic deposition is physically and/or chemically treated and/or provided with an adhesion promoting coat. In the second embodiment of the process according to the invention, t
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Blum Joachim
Engel Dieter
Klein Klausjorg
Kuhhirt Walter
Vogt-Birnbrich Bettina
Herberts GmbH
Kolb Jennifer
Meeks Timothy
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