Back to results
US 7,311,393 B2Granted
Inkjet recording ink and method of inkjet recording
AssigneeFUJIFILM Corporation
InventorsToshiki Taguchi, Takashi Ozawa, Akio Miyamoto, Naotaka Wachi
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeFUJIFILM Corporation
InventorsToshiki Taguchi, Takashi Ozawa, Akio Miyamoto, Naotaka Wachi
Estimating the term…
The object of the present invention is to provide an inkjet recording ink ensuring excellent ejection stability even after aging of the ink and also exhibiting excellent weather resistance; provide an inkjet recording ink ensuring less blurring of the image drawn, in addition to excellent ejection stability and weather resistance; and provide a yellow ink and a dark yellow ink, which can contribute to realization of a pictorial quality with excellent color balance as a constituent ink of an ink set. These objects of the present invention can be achieved by an inkjet recording ink including an aqueous medium containing a yellow dye, particularly, a yellow dye represented by formula (1), having spectral absorption characteristics such that the maximum absorption wavelength is in the region from 390 to 470 nm and the absorption long-wave end has a tailing of a specified value or less, and antioxidative characteristics such that the ozone enforced discoloration rate constant is 5.0 x 10−2 [hour−1] or less. Furthermore, when the ink contains a diamino compound represented by formula (A), a carbonyl group (or sulfo group or the like)-containing cyclic compound represented by formula (B) and an organic solvent having a specific structure, the effect of the present invention is enhanced.
An inkjet recording ink comprising an aqueous medium having dissolved and/or dispersed therein at least one dye having λmax in a region of from 390 to 470 nm and having a ratio of an absorbance I(λmax+70 nm) at λmax+70 nm to an absorbance I(λmax) at λmax, namely, I(λmax+70 nm)/I(λmax), of 0.4 or less, wherein when a reflection density after printing an image with the ink on a reflective image-receiving medium is measured through a Status A blue filter and a point having a reflection density (DB) of 0.90 to 1.10 in a yellow region is defined as an initial density of the ink and when the printed image is enforcedly discolored by using an ozone discoloration tester capable of always generating 5 ppm of ozone and an enforced discoloration rate constant is determined from a time until the reflection density decreases to 80% of the initial density, the enforced discoloration rate constant is 5.0×10−2 [hour−1] or less.
An inkjet recording ink comprising an aqueous medium having dissolved and/or dispersed therein at least one dye having λmax in a region of from 390 to 470 nm and represented by the following formula (1):
Dependencies are inferred from the claim text.