Inventors:
Norman Smith - Cincinnati OH, US
Russell Schwartz - Montgomery OH, US
Kimberly Clark - Cincinnati OH, US
Terence Chamberlain - Montgomery OH, US
International Classification:
C07D 215/20, C08K 5/34
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.