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US 7,438,753 B2Granted
Diazo dyestuff compounds and their use
AssigneeEverlight USA, Inc.
InventorsJen-Fang Lin, Tzu-Kwei Sun, Hsiao-San Chen, Wen-Chin Lin
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Abstract
The present invention relates to a diazo dyestuff compound of the following formula (I) wherein, M is H, Na, or Li. The formula (I) compound is particularly suitable for using as a component in a black dye composition for ink-jet printing ink, and inkjet printing inks with good light-fastness are obtained.
Claims12
A diazo dyestuff compound of the following formula (I):
- wherein M is H, Na or Li.
A black dyestuff composition comprising:
- (A) a diazo dyestuff compound of the following formula (I),
- wherein, M is H, Na or Li;
- said diazo dyestuff compound of formula (I) is present in an amount ranging from 50% to 97% by weight;
- and
- (B) at least one non-black dyestuff selected from the group consisting of yellow dyestuffs, red dyestuffs, and orange dyestuffs, said non-black dyestuff is present in an amount ranging from 50% to 3% by weight.
2 more elements
Dependencies are inferred from the claim text.