Canon Kabushiki Kaisha

Katsuhiro Hayashi

Kenji Nishiguchi

Naofumi Shimomura

Tsuyoshi Furuse

Tsuyoshi Kasai

Toshiyuki Umesato

Satoru Kobayashi

Ikuo Nakazawa

Takayuki Horiuchi

Takeshi Ota

Shigemoto Abe

Junichi Sakai

Hideyuki Saito

Taro Endo

Kousuke Yamasaki

Yoshio Nakajima

Hiromitsu Kishi

Tetsu Iwata

Keiichi Ito

Yuhei Shimizu

Yuko Nishiwaki

Naotoshi Miyamachi

Otome Yamashita

Masahito Miyabe

Ryota Takeuchi

Sachie Furukawa

Toshihiro Omagari

Ai Sakuma

Masaru Ebine

An aqueous ink jet ink contains a pigment, a resin and an additive. The resin has a unit containing a carboxylic acid group and a unit containing an aromatic group. The additive is at least one member selected from the group consisting of butanedicarboxylic acid, pentanedicarboxylic acid, pentanetricarboxylic acid, hexanedicarboxylic acid, hexanetricarboxylic acid, heptanetricarboxylic acid, octanetricarboxylic acid and nonanetricarboxylic acid. The content (ppm) of the additive is 180 ppm or more to 1,200 ppm or less with respect to the total mass of the ink.

Aqueous ink, ink cartridge and ink jet recording method

Provided are an aqueous ink for ink jet capable of recording an image having excellent abrasion resistance and glossiness and an ink cartridge and an ink jet recording method using the aqueous ink. Provided is an aqueous ink for ink jet including a coloring material and a plurality of resins (first resin and second resin) different from the coloring material. The first resin is a resin particle formed of a first polyester resin and the second resin is at least one of (i) a block copolymer containing an A block having no acid group and a B block having an acid group and (ii) a second polyester resin having a sulfonic acid group. Further, an ink cartridge using the aqueous ink and an ink jet recording method in which the aqueous ink is ejected from an ink jet recording head to record an image on a recording medium are provided.

To provide an aqueous ink having excellent ejection stability and capable of recording an image having excellent abrasion resistance and the like. An aqueous ink for ink jet containing a resin particle, in which the resin particle is formed of a first resin and a second resin, each having a carboxylic acid group, the first resin is a polyester resin not having a crosslinked structure, the second resin is at least one of a polyester resin and an acrylic resin having a crosslinked structure, and the crosslinked structure of the first resin and the second resin is an alkylene oxide group having a repetition number of 1 to 9.

Aqueous ink, ink cartridge, ink jet recording method and method for producing aqueous ink

To provide an aqueous ink having excellent storage stability and capable of recording an image having excellent abrasion resistance and the like. An aqueous ink for ink jet containing a resin particle, in which the resin particle is formed of a polyester resin having a carboxylic acid group, and an amount of carboxylic acid groups present on particle surfaces of the resin particle is 0.3 times or more to 0.8 times or less in terms of molar ratio with respect to all of the carboxylic acid groups in the polyester resin having the carboxylic acid group.

An aqueous ink for ink jet, the aqueous ink containing a pigment and a resin. The pigment is impregnated with a compound having a structure in which at least two structures each represented by General Formula (1) are bonded by a glycoside bond. 

Aqueous ink, ink cartridge, and ink jet recording method

An ink jet ink including water, a pigment and a polymer. The pigment has a secondary amino group. The polymer contains a unit derived from a monomer having a ring structure containing a tertiary amino group.

Ink jet ink and ink jet recording method

Provided is a synthesis method for a self-dispersible pigment, including performing ring-opening addition of a lactone-based compound to an acidic group bonded to a surface of a pigment particle directly or via another atomic group to bond a functional group including an ester group to the surface of the pigment particle.

Synthesis method for self-dispersible pigment, self-dispersible pigment, ink jet ink, ink cartridge, and ink jet recording method

To provide an ink jet ink capable of achieving both high colorability and excellent bleeding resistance of an image and having excellent storage stability, provided is an ink jet ink including at least a pigment and a star polymer having a structure represented by at least one formula selected from the group consisting of the following general formulae (1) to (3).R&#x2014;(S&#x2014;R')&#x2003;&#x2003;General formula (1)R&#x2014;(X&#x2014;S&#x2014;R&#x2032;)&#x2003;&#x2003;General formula (2)R&#x2014;(O&#x2014;X&#x2014;S&#x2014;R&#x2032;)&#x2003;&#x2003;General formula (3)

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

An ink jet liquid composition which is used with an ink containing a pigment and which contains an ABC triblock polymer formed from an A block having an aryl group, a B block having a unit represented by the general formula (1), and a C block having a unit represented by the general formula (2), wherein an acid value of the polymer is 20 mgKOH/g or more and less than 150 mgKOH/g, the ratio of the number average molecular weight of the polymer to the acid value is 50 or more and 200 or less, the proportion of the A block in the polymer is 20.0 percent by mass or more and 80.0 percent by mass or less and is 5.0 times or more and 15.0 times or less the proportion of units derived from all acidic monomers contained in the polymer. 

Ink jet liquid composition, set, liquid cartridge, and ink jet recording method

Provided is an ink jet clear ink containing a polymer fine particle. The polymer fine particle has a core-shell structure obtained by polymerizing an &#x3b1;,&#x3b2;-ethylenically unsaturated hydrophobic monomer (b) as a core polymer in the presence of a shell polymer that is a copolymer having at least a unit derived from an &#x3b1;,&#x3b2;-ethylenically unsaturated hydrophobic monomer (a) and a unit derived from a monomer selected from an &#x3b1;,&#x3b2;-ethylenically unsaturated acid monomer and a salt thereof. The &#x3b1;,&#x3b2;-ethylenically unsaturated hydrophobic monomer (b) includes at least a monomer containing a chain structure saturated alkyl group.

Clear ink, ink jet recording method, ink set, ink cartridge, recording unit and ink jet recording apparatus

Provided is an ink jet ink capable of achieving both high colorability and excellent bleeding resistance of an image. The ink jet ink includes at least a pigment and a star polymer in which at least three copolymer chains of &#x3b1;,&#x3b2;-ethylenically unsaturated monomers are bonded to a central skeleton, in which the copolymer chains of the &#x3b1;,&#x3b2;-ethylenically unsaturated monomers are copolymers of at least one first monomer selected from the group consisting of aromatic (meth)acrylates and aromatic (meth)acrylamides and at least one second monomer selected from the group consisting of acid monomers and salts of the acid monomers.

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Yokohama, Japan

Katsuhiro Hayashi