Patent · US Expired

Method for determining the shade stability of lacquers

US6628393B1 · kind B1 · utility

0Cited by

6References

14Claims

0Family size

Assignee

BASF COATINGS GMBH · DE

Inventors

Bernd Biallas · Sendenhorst, DE
Wolfgang Duschek · Munster, DE
Werner Rotz · Münster, DE
Harald Berlin · Nottuln, DE

Key dates

Filing date	May 15, 2001
Grant date	Sep 30, 2003
Priority date	—
Expiry date	May 15, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG01J2003/466
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

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 FT0 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 FTlim 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.