Canon Finetech Inc.

Canon Kabushiki Kaisha

Suzuka Ueno

Tomoya Yamamoto

Junko Chizuwa

Takayuki Ookawa

Yukiko Tachibana

Takayuki Toyoda

Yasuaki Murai

Yuhei Terui

Hitoshi Itabashi

Yu Yoshida

Haruko Kubo

The present invention provides a dispersant excellent in the solubility to a solvent, the adsorption power to a coloring material, and the coloring material dispersibility, and reduced in the self-coloring property, a compound and a polymerizable compound for preparing the dispersant, and a toner using the dispersant. The dispersant has a structure in which a structure represented by the following specific formula (3) or a tautomer thereof is bonded with a polymer, and the toner contains the dispersant. 

Compound, dispersant and toner

To provide a pigment dispersion liquid which provides an ink capable of recording an image having high fixability and fastness such as scratch resistance and excellent quality stably for a long time in any conditions. A pigment dispersion liquid mainly containing a polymer dispersant, a coloring material and water, in which the polymer dispersant is formed of at least a hydrophobic unit and a hydrophilic unit, the hydrophobic unit having a block portion formed of at least one hydrophobic monomer, the coloring material is formed of a pigment having on its surface an acid form anionic group, and the pigment dispersion liquid further contains a basic compound capable of forming a complex with an alkaline metal.

Pigment dispersion liquid, inkjet recording ink, inkjet recording method, ink cartridge and inkjet recording apparatus

A pigment dispersion liquid capable of stably recording images having high fastness and excellent quality for a long term in any cases has been provided. A pigment dispersion liquid mainly containing a polymer dispersant, a pigment and water, wherein the polymer dispersant is a copolymer comprised of at least a hydrophobic unit and a hydrophilic unit, the hydrophobic unit has a block portion comprised of at least one hydrophobic monomer, the hydrophilic unit has at least a repeating unit structure of an acrylamide structure of the following general formula (1), and the segment number (A) of the block portion comprised of a hydrophobic monomer to the number (B) of all segments of the polymer dispersant is in a range of 0.07 to 0.85 in terms of A/B ratio.

Pigment dispersion liquid, ink jet recording ink, ink jet recording method, ink cartridge and ink jet recording apparatus

An ink jet aqueous ink mainly containing a water-insoluble coloring material, a water-soluble organic solvent, an auxiliary ingredient and water is characterized by containing as an auxiliary ingredient at least one ethylene oxide adduct of an ester of cholesterin, lanosterin or agnosterin and a hydroxyl fatty acid.

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

The invention provides an ink-jet water-based ink that can stably record images having high fastness properties and excellent quality over a long period of time even in any case, and further provides an ink-jet recording method, by which images having excellent fastness properties and quality can be recorded, and an ink cartridge and an ink-jet recording apparatus containing such an ink. The ink-jet water-based ink principally includes a water-insoluble coloring material, a water-soluble organic solvent, an auxiliary component and water, wherein at least polyoxyethylene castor oil or polyoxyethylene hardened castor oil is contained as the auxiliary component.

Growing community of inventors

Fukui, Japan

Suzuka Ueno