High color strength diarylide yellow pigment compositions
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United States of America Patent
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Mar 10, 1987
Grant Date -
N/A
app pub date -
Apr 12, 1985
filing date -
Apr 12, 1985
priority date (Note) -
Expired
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Abstract
Improved diarylide yellow pigment compositions having high color strength. The compositions are manufactured by modifying tetrazotized 3,3'-dichlorobenzidine with a solution of about 3 to about 5 mole percent of a first acetoacetarylide, followed by coupling into a second acetoacetarylide such as acetoacetanilide.
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