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US 6,267,807 B1Granted
Method for grinding colorants
AssigneeLexmark International, Inc.
InventorsKenneth James Harshbarger, Ajay Kanubhai Suthar, Richard Barber Watkins, Austin Keith Wickline
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Abstract
A method for grinding colorant agglomerates with a grinding medium comprising a Group IIIB and/or a lanthanide element and a Group IVB oxide. The grinding medium has a grain size of less than about 1.35 microns, and results in the production of substantially pure colorant concentrates.
Claims26
A method for making a colorant concentrate comprising the steps of:
- (a) combining a colorant and a carrier liquid to produce a premix;
- and
- (b) grinding said premix in a mill comprising a grinding medium having a grain size of less than about 1.35 microns, said grains being the portions of the grinding medium having a homogeneous crystallographic orientation, surrounded by other such portions.
Dependencies are inferred from the claim text.