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US 2006/0189726 A1Published application
Preparation of yellow pigment
OwnerNorman Smith, Russell Schwartz +2inventors
InventorsNorman Smith, Russell Schwartz, Kimberly Clark, Terence Chamberlain
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Abstract
A process for preparing transparent Pigment Yellow 138 by grinding Pigment Yellow 138 in the presence of a grinding agent, preparing an aqueous slurry of the ground particles, and filtering the slurry resulting in a filter cake containing particles of transparent Pigment Yellow 138. In addition, a process for improving color strength of an ink and/or plastic composition is also disclosed by adding transparent Pigment Yellow 138 to the composition.
Claims9
Transparent Pigment Yellow 138 prepared by
- (a) grinding Pigment Yellow 138 in the presence of a grinding agent to obtain ground pigment;
- (b) preparing an aqueous slurry of said ground pigment;
- (c) filtering said slurry resulting in a filter cake containing transparent Pigment Yellow 138;
- and
- (d) drying said filter cake to obtain ransparent Pigment Yellow 138.
2 more elements
Dependencies are inferred from the claim text.