Method for the production of dyestuff pastes

Optics: measuring and testing – By dispersed light spectroscopy

Reexamination Certificate

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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.

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