Basf Coatings Ag

Basf Se Corporation

Harald Berlin

Wolfgang Duschek

Bernd Biallas

Werner Rotz

Klaus Arlt

Rolf Schulte

Karin Eckert

Christian Bornemann

Margaret Stockbrink

Josef Kallrath

Gerd Nienhaus

Clemens Baumeister

A method that is suitable for modelling and simulating optical properties in special effect paints which contain pigments with isotropic light-scattering properties and pigments with anisotropic light-scattering properties, and the effect-producing substances form at least one layer of material or coat of paint on a suitable substrate. The method is characterised in that the isotropically light-scattering pigments and the anisotropically light-scattering pigments are virtually separated such that the isotropically light-scattering pigments virtually form the layer of material and the anisotropically light-scattering pigments are virtually arranged on the edge surfaces of the layer of material. The optical properties of the virtual layer of material of the isotropically light-scattering pigments are determined by linear differential equations and the optical properties of the anisotropically light-scattering pigments are taken into consideration as boundary conditions, by means of specific effect operators.

Method and apparatus for modelling and simulating optical properties of special effect paints and for determining illumination and measurement geometries for spectral photometers

In a method of determining the shade stability of paints, the total color difference &Dgr;E(FT) between the color at the film thickness FT and the color at a predetermined film thickness FT is measured for different film thicknesses FT. Subsequently, the slope &sgr;(FT) of the plot &Dgr;E(FT) is determined, which represents a useful parameter for the shade stability. Alternatively to &sgr;(FT), it is also possible to determine the limiting film thickness FT at which the total color difference &Dgr;E(FT) passes below a predetermined limit. The method of determining the shade stability is additionally employed in order to optimize paint formulations.

Method for determining the shade stability of lacquers

Apparatus and method for measuring coated test panels, the test panels ( ) being taken from a feed magazine ( ) by a gripping and moving device, e.g. a laboratory robot, placed on a measuring station ( ) and, finally, transferred to a delivery station ( ). In the measuring station ( ) measurement of the various properties of the coating is carried out by the laboratory robot ( ) using various measuring devices ( ). This process can in particular involve spatial resolution and electronic recording. The test panels can furthermore be distinguished by a bar code system which is recorded and evaluated electronically.

Method and device for measuring painted test tables

The present invention relates to a novel process for coating objects by means of direct current, in which process an adjustable DC voltage is pulse-modulated with an adjustable AC voltage. The process is useful for electrochemical coating of objects with resinous coating material. Preferably, the pulse modulation of the DC voltage is limited to certain time intervals during the coating process and the pulse modulation is connected and disconnected with an adjustable duty ratio.

Pulse-modulated DC electrochemical coating process and apparatus

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Nottuln, Germany

Harald Berlin