Canon Kabushiki Kaisha

Masako Udagawa

Shinichi Hakamada

Akira Nagashima

Makoto Aoki

Takashi Imai

Shoji Koike

Sadayuki Sugama

Kenji Moribe

Hideki Takayama

Kouhei Nakagawa

Hirofumi Ichinose

Hideyuki Takai

Hiroshi Kakikawa

Shuichi Okazaki

Yuuhei Shimizu

Hiroshi Tomioka

Hideki Yamakami

Nobuyuki Matsumoto

Shin-ichi Hakamada

The invention provides an aqueous ink comprising a polymer having hydroxyl groups and a pigment, which can provide images excellent in scratch resistance and highlighter resistance and can inhibit the seeping out phenomenon of the polymer and the deterioration of ejection characteristics even when it is stored for a long period of time. The aqueous ink comprises a polymer having hydroxyl groups, a pigment and a water-soluble organic solvent, wherein the water-soluble organic solvent comprises a polyhydric alcohol having a value of number of hydroxyl groups/number of carbon atoms in its molecule of 0.50 or less.

Aqueous ink, ink jet recording method, ink cartridge, recording unit and ink jet recording apparatus

An ink contains at least a pigment, wherein the pigment is a solid solution of C.I. Pigment Red 202 and C.I. Pigment Violet 19, and a primary particle diameter D (nm) of the pigment and a 50%-cumulative diameter D(nm) in particle diameter distribution of the pigment satisfy a relation of D&#xd7;0.95&#x2266;(=&#x3c;)D&#x2266;(=&#x3c;)130, and a 90%-cumulative diameter D(nm) in particle diameter distribution of the pigment and the 50%-cumulative diameter D(nm) satisfy a relation of 1.5&#x2266;(=&#x3c;)D/D&#x2266;(=&#x3c;)2.2.

Ink, ink jet recording method, ink cartridge, and ink jet recording apparatus

An aqueous ink comprising a polymer having hydroxyl groups and a pigment, which can provide images excellent in scratch resistance and highlighter resistance and can inhibit the seeping out phenomenon of the polymer and the deterioration of ejection characteristics even when it is stored for a long period of time. The aqueous ink comprises a polymer having hydroxyl groups, a pigment and a water-soluble organic solvent, wherein the water-soluble organic solvent comprises a poor medium for a polymer that is not adsorbed on the pigment (out of the polymer having hydroxyl groups), and wherein when the segment constituting the polymer that is not adsorbed on the pigment (out of the polymer having hydroxyl groups) is comprised of a segment A having hydroxyl groups and a segment B having no hydroxyl group, at least one of the poor medium is a good medium for either one of the segment A and the Segment B.

The present invention relates to a water-based fluorescent ink for the purpose of measurement or judgment of the fluorescence emission in a visible light region by an excitation wavelength in a predetermined ultraviolet range, containing water, a coloring material dissolved or dispersed in water, and an organic solvent, having a plurality of fluorescent groups in the coloring material structure of the coloring material, and using a water-soluble coloring material having a sulfonic acid group as the water-soluble group in the state of a free acid, capable of improving the water resistance and the light resistance, dramatically increasing the content of the fluorescent coloring material in the ink, which has conventionally been included only by a small amount in the ink due to the concentration quenching problem, obtaining preferable fluorescence emission and water resistance of the recorded image, and providing preferable adhesion resistance to the recording medium of the coloring material and reliability.

Water-based fluorescent ink, recorded image using the same, and judging method

The invention provides an aqueous ink comprising a polymer having hydroxyl groups and a pigment, which can provide images excellent in scratch resistance and highlighter resistance and can inhibit the seeping out phenomenon of the polymer and the deterioration of storage stability and ejection characteristics even when it is stored for a long period of time. The aqueous ink comprises a polymer having hydroxyl groups and a pigment, wherein a proportion of a content of a polymer that is not adsorbed on the pigment out of the polymer having hydroxyl groups to the content of the pigment in the ink is 2.0 mass % or more, and a content (mass %) of the polymer that is not adsorbed on the pigment out of the polymer having hydroxyl groups is 0.20 mass % or less based on the total mass of the ink.

An ink contains at least a pigment, wherein the pigment is C.I. Pigment Red 282, and a primary particle diameter D (nm) of the pigment and a 50%-cumulative diameter D50 (nm) in particle diameter distribution of the pigment satisfy a relation of D&#xd7;0.95&#x2266;D50&#x2266;150, and a 90%-cumulative diameter D90 (nm) in particle diameter distribution of the pigment and the 50%-cumulative diameter D50 (nm) satisfy a relation of 1.5&#x2266;D90/D50&#x2266;2.5.

To provide an ink set which achieves an improvement in gradation of a monochrome image and the realization of a high black density, and which solves gloss unevenness occurring upon formation of an image by means of at least three kinds of black inks different from one another in carbon black content. Provided is an ink set having at least three kinds of black inks different from one another in carbon black content in which carbon black contents in the at least three kinds of inks establish a specific relationship.

Ink set, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus, and image forming method

A mailing ink, an ink tank for mailing, an ink jet recording method for mailing and an ink jet recording apparatus for mailing that can reconcile preferable tint and visibility as indicia with readability by a 2-D bar code reader. The ink is a mailing ink used in ink jet recording. In the mailing ink, the ink tank, the ink jet recording method, and the ink jet recording apparatus, the ink provides an 'a*' of from &#x2212;10 to 15 and a 'b*' of from &#x2212;50 to &#x2212;15 according to the CIE L*a*b* color system in a printed portion obtained by applying the ink to a recording medium so as to give an application amount of ink of 4.5 mg per square inch, and provides an integrated value of reflection spectrum of 90 or lower in a wavelength region of from 380 nm to 730 nm in the printed portion.

Mailing ink, and ink tank for mailing, ink jet recording method for mailing and ink jet recording apparatus for mailing using the same

An object of the present invention is to provide an ink set which can produce images with color developability undoubtedly higher than images produced by a conventional pigment ink and closer to images produced by silver halide photography or output from a laser printer, in particular, color developability in a red color region, while keeping ink reliability. The ink set comprises at least a first ink and a second ink wherein the first ink has a maximum absorption wavelength in a region of 450 nm or more and less than 500 nm and the second ink has a maximum absorption wavelength in a region of 500 nm or more and 570 nm or less, and the ink set has a B/A ratio of a minimum absorbance B to a maximum absorbance A of 0.7 or more and 1.0 or less among absorbances of the first ink and the second ink in total in a region of 450 nm or more and 570 nm or less.

Ink set, image forming method, ink jet recording method, ink cartridge, and recording unit

A fluorescent recorded image and an image forming method capable of achieving the compatibility between fluorescence intensity and recorded matter density are provided. The image is composed of multiple layers formed from fluorescent ink, or preferably fluorescent ink containing a surfactant. The method includes superimposing the fluorescent ink to form the fluorescent image.

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Kawasaki, Japan

Masako Udagawa