E.i. Dupont De Nemours and Company

Axalta Coating Systems IP Co LLC

Coatings Foreign IP Co. LLC

Marc Chilla

Karl-Friedrich Doessel

Marcus Brunner

Gunter Richter

Michael Georgiadis

Volker Kegel

Volker Paschmann

Peter Minko

Giannoula Avgenaki

Christian Voye

Armin Goebel

Bruno Wokalek

Frank-Peter Tiegs

A process for the production of base coat/clear coat multi-layer coatings in an A' color shade wherein the base coat layer is applied in a first layer from a water-borne base coat AB and in a second layer from a water-borne base coat A with low hiding power and having a color shade A&#x2032;, wherein the water-borne base coat AB is a mixture of the water-borne base coat A and a water-borne base coat B with sufficient hiding power.

Process for the production of multi-layer coatings

A process for producing multi-layer coatings in light metallic color shades and reducing UV transmission there-through comprising the successive steps of:

Process for producing multi-layer coatings in light metallic color shades

A process for the production of multi-layer coatings comprising the successive steps: 1) applying an 8 to 20 &#x3bc;m thick coating layer from an aqueous coating composition A onto a substrate provided with an EDC primer, 2) applying a 5 to 15 &#x3bc;m thick base coat layer from an aqueous coating composition B onto the previously applied coating layer, 3) applying a clear coat layer onto the base coat layer, 4) jointly curing the three coating layers, wherein coating compositions A and B being different from each other and wherein the coating composition A contains at least one metal platelet pigment having a thickness from 10 to 100 nm in a proportion corresponding to a pigment/resin solids ratio by weight from 0.06:1 to 0.2:1.

A process for the production of multi-layer coatings in A' color shades, comprising the successive steps: wherein the base coat layer is applied in a first layer of a modified water-borne base coat modAB prepared by mixing an unmodified, water-borne base coat A with an unmodified water-borne base coat B and with a pigment-free admixture component and in a second layer of the unmodified water-borne base coat A.

A process for the production of special effect multi-layer coatings, comprising the successive steps: (1) applying a 10 to 30 &#x3bc;m thick base coat layer onto a substrate provided with an EDC primer, (2) applying a clear coat layer onto the base coat layer, (3) jointly curing the base coat and clear coat layers, wherein the base coat layer is applied in a first layer and in a second layer; the first layer comprises a modified water-borne base coat produced by mixing an unmodified water-borne base coat with an admixture component and the second layer comprises the unmodified water-borne base coat, wherein the unmodified water-borne base coat has a ratio by weight of pigment content to resin solids content of 0.05:1 to 0.6:1 and wherein the pigment content of the unmodified water-borne base coat comprises at least one metal flake pigment having a thickness of 10 to 100 nm corresponding to a proportion of 0.1 to 5 wt. %, relative to the resin solids content of the unmodified water-borne base coat and at least one additional special effect pigment and wherein the composition of the pigment content is such that the UV light transmission through the base coat layer formed of the first and second layers is less than 0.1% in the wavelength range of from 290 to 380 nm and less than 0.5% in the wavelength range of from 380 to 400 nm.

A process for the generation of a computer image of a coated, three-dimensional object involves applying at least a relevant coating layer on at least two test panels under the influence of a set of coating parameters which differs with respect to each panel; taking a plurality of measurements of at least one optical surface property as a function of the set of coating parameters selected on application of the relevant coating layer on each panel; storing the optical data in a datafile with assignment of the relevant set of coating parameters; facetting the visible surface(s) of a three-dimensional object by computer into a sufficient number of flat polygonal areas each being sufficiently small for the sufficiently accurate description of the surface topography; assigning the relevant set of coating parameters and associated optical data in each case to each individual polygonal area by computer; and assembling the polygonal areas into a computer image of the three-dimensional object.

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Sprockhoevel, Germany

Marc Chilla