Herberts Gmbh

Manfred Stein

Klausjorg Klein

Matthias Kimpel

Udo Bastian

Reiner Bohmert

Process for the production of multi-layer lacquer coatings by electrophoretic deposition of a first coating layer of a first, aqueous coating composition onto an electrically conductive substrate, application of a second coating layer based on a second, powder coating composition and joint baking of the coating layers so obtained, which process is characterised in that a powder coating composition is used for the second coating layer which is based on binders which contain no diene-based polymer units, wherein the coating composition is selected such that the minimum baking temperature range of the second coating layer is above that of the first coating layer or overlaps with this range in such a manner that the lower limit of the range of the second coating layer is above the lower limit of the range of the first coating layer.

Process for the production of multi-layer lacquer coatings

Process for producing a multi-layer lacquer coating by the application of a coat of clear lacquer including coating agents which are curable exclusively by polymerization in radicalic and/or cationic manner to a dried or crosslinked colored and/or effect-producing basecoat film process is performed in light having a wavelength of over 550 nm or subject to the exclusion of light. The application step is followed by initiation or implementation of curing of the clear-lacquer film by high-energy radiation. The process is particularly suitable for producing multi-layer lacquer coatings in the automobile industry.

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Hurth, Germany

Manfred Stein