Yellow dyes and ink compositions
View Patent ↗Provided are novel yellow azo dyes which are useful in ink compositions, especially ink jet compositions. The dyes and ink compositions of the present invention exhibit a good balance of optical density, print reliability, water fastness and light fashion and exhibit improved water solubility, thus rendering the ink compositions to be especially suitable for printheads having small nozzle openings.
1. A compound of the formula
wherein M comprises —H, —Li, —Na, —K, —N(R 1 ) 4 , or —HN(R 1 ) 3 ,
wherein R 1 comprises —H, -lower alkyl, or —(CH 2 CHR 2 —O)—H, and R 2 comprises —H, —CH 3 , —CH 2 CH 3 , or —CH 2 OH.
2. The compound of claim 1 having the formula
3. An ink composition comprising
a) at least 0.1% by weight of a compound of claim 1 ,
b) water, and
c) at least one co-solvent.
4. An ink composition comprising
d) at least 0.1% by weight of a compound of claim 2 ,
e) water, and
f) at least one co-solvent.
5. A substrate or medium coated with the ink composition of claim 3 .
6. A substrate or medium coated with the ink composition of claim 4 .
7. The medium of claim 5 wherein said medium is selected from paper, projector slides and textile materials.
8. The medium of claim 6 wherein said medium is selected from paper, projector slides and textile materials.
9. A compound of the formula
wherein M comprises —H, —Li, —Na, —K, —N(R 1 ) 4 , or —HN(R 1 ) 3 ,
wherein R 1 comprises —H, -lower alkyl, or —(CH 2 CHR 2 —O)—H, and R 2 comprises —H, —CH 3 , —CH 2 CH 3 , or —CH 2 OH.
10. The compound of claim 9 having the formula
11. An ink composition comprising
g) at least 0.1% by weight of a compound of claim 9 ,
h) water, and
i) at least one co-solvent.
12. An ink composition comprising
j) at least 0.1% by weight of a compound of claim 10
k) water, and
l) at least one co-solvent.
13. A substrate or medium coated with the ink composition of claim 11 .
14. A substrate or medium coated with the ink composition of claim 12 .
15. The medium of claim 13 wherein said medium is selected from paper, projector slides and textile materials.
16. The medium of claim 14 wherein said medium is selected from paper, projector slides and textile materials.