Dyes for Ink Jet Printing
Publication Date: 2005-Oct-14
The IP.com Prior Art Database
A process for printing an image on a substrate comprising applying to the substrate by means of an ink jet printer an ink comprising a disazo compound of Formula (1), as defined, comprising a central alkoxy-s-triazine group and two naphthyl - azo- phenyelne -NR- groups attached to the s- traizine group. Also disclosed are compounds, compositions, inks and their uses in ink jet printing. The compounds have useful properties such as good light fastness.
Dyes for Ink Jet Printing
This public disclosure relates to compounds suitable for use as dyes, to inks and to their use in ink jet printing (“IJP”). IJP is a non-impact printing technique in which droplets of ink are ejected through a fine nozzle onto a substrate without bringing the nozzle into contact with the substrate.
There are many demanding performance requirements for dyes and inks used in IJP. For example they desirably provide sharp, non-feathered images having good water-fastness, light-fastness and optical density. The inks are often required to dry quickly when applied to a substrate to prevent smudging, but they should not form a crust over the tip of an ink jet nozzle because this will stop the printer from working. The inks should also be stable to storage over time without decomposing or forming a precipitate that could block the fine nozzle.
According to a first aspect of the present public disclosure there is provided a process for printing an image on a substrate comprising applying to the substrate by means of an ink jet printer an ink comprising a compound of Formula (1) and salts thereof:
R4, R5, R6 and R7 are each independently H or an optionally substituted substituent or R4 and R5 and/or R6 and R7 together with the carbon atoms to which they are attached form an optionally substituted aryl or heterocyclic ring;
X and Z are each independently H or an optionally substituted substituent;
R1 is H or C1-4-alkyl;
R2 and R3 are each independently H, C1-4-alkyl, (-CONR8R9), (-SO2NR8R9) or aryl groups; wherein R8 and R9 are each independently H, optionally substituted C1-8-alkyl, an optionally substituted aryl or heterocyclic ring, or R8 and R9 together with the nitrogen atom to which they are attached form an optionally substituted 5- or 6-membered ring;
G and G’ are each independently a sulphonic acid group, carboxylic acid group or a phosphonic acid group;
n and m are each independently 0, 1, 2, 3, 4 or 5; and
a and b are each independently 0, 1 or 2.
Preferably X and Z are each independently H, or optionally substituted alkyl, optionally substituted alkoxy, optionally substituted aryl, optionally substituted heterocyclic, NR8R9, NHCOR8, NHCONR8R9, ‑C(O)R8, -C(O)OR8, ‑C(O)NR8R9, PO3H2, -SR8, -SO2R8, ‑SO2NR8R9, -SOR8, -SO3H, CF3, CN, NO2 or halogen, wherein R8 and R9 are each independently H, optionally substituted C1-8-alkyl, optionally substituted aryl for example phenyl or optionally substituted heterocyclic, or R8 and R9 together with the nitrogen atom to which they are attached form an optionally substituted 5...