Canon Kabushiki Kaisha

Yojiro Kojima

Takayuki Ishikawa

Takashi Saito

Kumiko Mafune

Satoshi Kudo

Yukako Tamanuki

Yoshio Kinoshita

Shogo Takemoto

Masayuki Ikegami

Daiji Okamura

Masashi Ogasawara

Hiroyuki Ogino

Takao Yamamoto

Jun Yoshizawa

Masashi Tsujimura

Yoshihisa Yamashita

Eiichi Nakata

Yoshihide Aikawa

Tetsu Iwata

Kuniaki Fujimoto

Fumihiko Mukae

Yuko Negishi

Otome Mori

An aqueous ink containing a self-dispersible pigment for use in an ink jet recording method using a recording head that ejects an ink by an action of thermal energy. The aqueous ink contains a compound represented by General Formula (I): where in General Formula (I) R's are independently of each other, a sulfonic acid group, a carboxylic acid group, a phosphoric acid group or a phosphonic acid group, Ris a hydrogen atom or an alkyl group, and n is an integer of 1 to 5.

Ink, ink cartridge, and ink jet recording method

An ink containing a first coloring material and a second coloring material, the sum total of these contents being 6.0% by mass or less. The first coloring material is a black coloring material exhibiting a difference &#x394;&#x3bb;of 20.0 or more between a maximum absorption wavelength in a 20.0% by mass aqueous solution of 1,2-hexanediol and a maximum absorption wavelength in water, the second coloring material is a specific coloring material exhibiting a difference &#x394;&#x3bb;of 12.0 or less between a maximum absorption wavelength in a 20.0% by mass aqueous solution of 1,2-hexanediol and a maximum absorption wavelength in water, and the sum of the &#x394;&#x3bb;and the &#x394;&#x3bb;is 35.0 or less.

Ink, ink cartridge and ink jet recording method

An object of the present invention is to provide an ink jet recording method which gives an ink excellent anti-sticking properties and can suppress the occurrence of undertrapping when recording surfaces of recording media which each have an ink-receiving layer are overlapped with each other, and to provide an ink jet recording apparatus. The ink jet recording method of forming an image on the recording medium having the ink-receiving layer by ejecting an ink from an ink jet recording head, the method including performing at least one of drying the recording medium which has the image formed thereon and humidifying a gap between the recording head and the recording medium, wherein the ink to be used for forming the image is an ink which contains water, a water-soluble organic solvent and a specific compound.

Ink jet recording method and ink jet recording apparatus

An ink jet recording method includes an image formation step of forming an image on a recording medium having an ink-receiving layer by ejecting an ink from an ink jet recording head and a humidification step of humidifying a gap between the recording head and the recording medium, in which in the image formation step, an ink containing a specified dye represented by general formula (I) and a water-soluble organic compound having an inorganic-organic balance value of 1.4 or more to 2.7 or less is used.

An ink jet recording method includes an image formation step of forming an image on a recording medium having an ink-receiving layer by ejecting an ink from an ink jet recording head and a humidification step of humidifying a gap between the recording head and the recording medium, in which in the image formation step, at least a cyan ink containing a specific dye and a magenta ink containing a specific dye are used.

Gas resistance of an image is evaluated by placing the image in a mixed gas atmosphere containing at least ozone and nitrogen dioxide. The mixed gas atmosphere is controlled such that the concentrations of ozone and nitrogen dioxide are not less than 75 ppb and not less than 150 ppb, respectively, and the mixed gas is continuously supplied to the surface of a sample bearing the image at a flow rate not less than 0.2 m/s and not more than 3.0 m/s.

Method of gas resistance test for image and ink set

It is an object to provide an ink that forms an image which is superior in color developability, has high environmental gas resistance, and further has superior bronze resistance. The ink comprising at least a coloring material is wherein the coloring material comprises a compound represented by a following general formula (I) or a salt thereof; the coloring material comprises a compound represented by a following general formula (I) or a salt thereof; and the maximum absorption wavelengths obtained by measuring an absorbance of a liquid prepared by diluting 2,000 times the ink with 90 mass % of N,N-dimethylformamide aqueous solution are respectively in a range of 580 nm or more and 640 nm or less and in a range of 650 nm or more and 700 nm or less; and a ratio B/A of 0.75 or more and 0.90 or less, wherein A is an absorbance at a maximum absorption wavelength in the range of 580 nm or more and 640 nm or less, and B is an absorbance at the maximum absorption wavelength in a range of 650 nm or more and 700 nm or less. 

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

An ink containing at least two coloring materials of a first coloring material and a second coloring material, wherein the first coloring material is a compound represented by the general formula (I), and the second coloring material is a compound represented by the general formula (II): 

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Tokyo, Japan

Yojiro Kojima