Optics: measuring and testing – By dispersed light spectroscopy
Reexamination Certificate
2005-12-27
2005-12-27
Evans, F. L. (Department: 2877)
Optics: measuring and testing
By dispersed light spectroscopy
C356S402000
Reexamination Certificate
active
06980292
ABSTRACT:
The invention relates to a method of producing color pastes, in which a component comprising colorant particles is dispersed in a binder. In the method of the invention the dispersing operation is controlled by beaming excitational light of a defined wavelength range into a mixture of the component comprising colorant particles and the binder, detecting the light transmitted, reflected and/or scattered by the mixture and determining a sample spectrum, evaluating the sample spectrum and hence determining parameters of the color paste, and monitoring changes in the sample spectrum over time and terminating the dispersing operation when predetermined target parameters are attained.
REFERENCES:
patent: 5022758 (1991-06-01), Schulz
patent: 5369483 (1994-11-01), Wilson
patent: 5953129 (1999-09-01), Anderlik et al.
patent: 6348538 (2002-02-01), Buhl et al.
patent: 6535283 (2003-03-01), Heffels et al.
patent: 19652791 (1998-07-01), None
patent: WO02/74866 (2002-09-01), None
English Abstract for DE19652791 from EPO, Jul. 2, 1998.
Berger Gerhard
Blaschka Peter
Czornij Zenon-Paul
Etzrodt Günter
Frey Thomas
BASF Coatings AG
Evans F. L.
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