Self-assembling dyes
View Patent ↗A novel dye according to formula (I): capable of self-assembling thus forming supra-molecular structures. These self-assembling dyes may be advantageously used in an ink-jet ink for improving the stability of ink-jet ink images to light fading.
1. A self-assembling dye according to
wherein
Linker represents any linking group containing at least one carbon, nitrogen, silicon, phosphorous, sulfur or oxygen atom;
CU means any chromophore group with an absorption maximum between 200 nm and 2000 nm
n and o are the same or different and are integers having a value of at least 1; m can be zero or any integer having a value of at least 1;
R 1 and R 2 are the same or different and represent hydrogen, a halogen, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted thioalkoxy group, a substituted or unsubstituted sulphoxy group, a substituted or unsubstituted suiphone group, a substituted or unsubstituted amino group, a nitrile group, a substituted or unsubstituted, saturated or unsaturated alkyl group, a substituted or unsubstituted acyl group, a substituted or unsubstituted sulphonyl group, a substituted or unsubstituted phosphoryl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, a heterocyclic group, a chromophore group, wherein said chromophore group CU is a dye selected from the group consisting of an azo dye with a molar extinction coefficient larger than 10 3 l.mol −1 cm −1 , an anthraquinone dye, a (poly)methine dye, an azomethine dye, a disazo dye, a carbonium dye, a styryl dye, a stilbene dye, a phthalocyanine dye, a coumarin dye, an aryl-carbonium dye, a nitro dye, a naphtholactam dye, a dioxazine dye, a flavin dye and a formazan dye; and
wherein said Linker is selected from the group consisting of a substituted or unsubstituted, saturated or unsaturated aliphatic group, a substituted or unsubstituted alicyclic hydrocarbon group, a substituted or unsubstituted aromatic group and a substituted or unsubstituted heteroaromatic group.
2. A self-assembling dye according to claim 1 , wherein said chromophore group CU is a chromophore group with an absorption maximum between 300 nm and 1200 nm.
3. A self-assembling dye according to claim 1 , wherein said chromophore group CU is a chromophore group with an absorption maximum between 380 nm and 850 nm.
4. A self-assembling dye according to claim 1 , wherein the association constant K ass of the self-assembling reaction, determined by 1 H-NMR in CDCl 3 , is at least 2.5 M −1 .
5. A self-assembling dye according to claim 4 wherein said association constant K ass is at least 10 2 M −1 .
6. A self-assembling dye according to claim 4 wherein said association constant K ass is at least 10 5 M −1 .
7. A self-assembling dye selected from the group consisting of