Brother Kogyo Kabushiki-kaisha

Masashi Tsuda

Shunichi Higashiyama

Michiko Aoyama

Hiromitsu Sago

Narumi Koga

Akihiko Taniguchi

Hideto Yamazaki

Kazuma Goto

Masaya Fujioka

Mayuko Umemura

Ryuji Kato

Noriaki Satoh

Yasuhiro Hattori

Junichiro Sugimoto

Akira Endo

Shigeru Kagayama

Noriatsu Aoi

Hisako Tonishi

Yoshito Toyoda

An ink set containing a water-based ink for ink jet recording and a treatment liquid. The water-based ink contains a phosphate group-modified self-dispersing pigment, water, and a water-soluble organic solvent. The treatment liquid contains a monovalent metal ion, water, and a water-soluble organic solvent.

Ink set, ink-jet recording apparatus, and ink-jet recording method

An ink set containing a water-based ink for ink jet recording and a treatment liquid. The water-based ink contains a phosphate-group modified self-dispersing pigment, water, and a water-soluble organic solvent. The treatment liquid contains an aggregating agent, water, and a water-soluble organic solvent. A dynamic surface tension of the water-based ink, measured under the condition where a life time is about 50 ms, is in the range of 35 mN/m to 45 mN/m. A dynamic surface tension of the treatment liquid, measured under the condition where a life time is about 50 ms, is in the range of 33 mN/m to 45 mN/m.

Ink set and ink-jet recording method

A water-based ink for ink jet recording, containing: a coloring agent; water; and a water-soluble organic solvent. The coloring agent contains a phosphate group-modified self-dispersing pigment. The water-based ink further contains at least one of a reducing sugar and a sugar alcohol and a calcium ion.

Water-based ink for ink jet recording

A water-based ink for ink jet recording, containing: a coloring agent; water; and a water-soluble organic solvent. The coloring agent contains a phosphate group-modified self-dispersing pigment. The water-based ink further contains at least one selected from the group consisting of boric acid, diglycolic acid, and a chelating agent.

An ink-jet recording apparatus includes a rubber member in an ink flow passage. The rubber member is pretreated with an organic solvent having a high boiling point, a water-based liquid containing a coloring agent, or a mixture of the two. The pretreatment is effective for preventing additives in the rubber material from being eluted into a water-based liquid for ink-jet recording, which can lead to clogging of ink-jet nozzles and the like.

Ink-jet recording apparatus

A water-based ink for ink-jet recording enables the expression of sharp text and lines in high density black, and the formation of a high quality gradation image in which the graininess is reduced in a black image of medium to high lightness. The inks include a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* calorimetric system of about 60 or less. The color ink (A) and the color ink (B) satisfy the following expression (I):about 120&#xb0;&#x2266;|&#x3b1;&#x2212;&#x3b2;| about &#x2266;240&#xb0;&#x2003;&#x2003;(I)wherein &#x3b1; is the hue angle of the color ink (A) and &#x3b2; is the hue angle of the color ink (B). The chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.

Water based ink for ink jet recording and ink jet recording method

The invention relates to an ink-jet recording apparatus having a nozzle provided on a nozzle face of an ink-jet head and a cleaning device for cleaning the nozzle face. The cleaning device contains a gas with a solubility in water lower than that of air in water.

A water-based ink for ink-jet recording and an ink-jet recording method allow the formation of sharp text and lines in high density black, and the formation of a high quality gradation image in which the graininess is reduced in a black image of a medium lightness to a high lightness (e.g., an achromatic image in dark gray to light gray) in ink-jet recording. The water-based ink combination for ink-jet recording comprises a black ink, and a color ink (A) and a color ink (B) that satisfy a color relationship of the following expression (I):about 120&#xb0;&#x2266;|&#x3b1;&#x2212;&#x3b2;|&#x2266;about 240&#xb0;&#x2003;&#x2003;(I)wherein &#x3b1; is the hue angle of the color ink (A) and &#x3b2; is the hue angle of the color ink (B).

Water-based ink for ink-jet recording and ink-jet recording method

One embodiment of the invention relates to an ink-jet recording apparatus comprising an ink-jet head with an ink passage having an inner volume and a preservative in the ink passage in a preservative residual ratio of no greater than 10%. Another embodiment of the invention relates to a preservative having water, a penetrant, and a humectant. A further embodiment of the invention relates to a processing method involving filling an inner volume of an ink passage in an ink-jet recording apparatus with a preservative and removing a portion of the preservative from the inner volume such that a preservative residual ratio is no greater than 10%.

An embodiment of the description relates to an ink-jet recording apparatus which includes an ink cartridge in which ink is stored in an ink chamber, and a mechanism that optically detects the amount of ink remaining in the ink chamber. The receding contact angle of the ink with respect to an inner wall surface of the ink chamber is about 20&#xb0; or more.

A fluorescent water base ink for ink-jet recording includes water, a first fluorescent dye, and a second fluorescent dye. The first fluorescent dye absorbs light in a first absorption wavelength region in an ultraviolet region to emit fluorescence, and the first fluorescent dye absorbs light in a second absorption wavelength region to emit no fluorescence. The second fluorescent dye absorbs light in an absorption wavelength region in the ultraviolet region, which is different from the first absorption wavelength region of the first fluorescent dye, to emit fluorescence. A wavelength region of the fluorescence of the second fluorescent dye is not overlapped with the first absorption wavelength region of the first fluorescent dye, but at least a part of the wavelength region of the fluorescence of the second fluorescent dye is overlapped with the second absorption wavelength region. The fluorescence intensity of the ink is increased.

Fluorescent water base ink for ink-jet recording

A fluorescent water base ink for ink-jet recording contains a first fluorescent dye and a second fluorescent dye. The first fluorescent dye has a first ultraviolet absorption wavelength region in an absorption spectrum and a first fluorescence emission wavelength region in a fluorescence spectrum. The second fluorescent dye has a second ultraviolet absorption wavelength region which is different from the first ultraviolet absorption wavelength region in an absorption spectrum and a second fluorescence emission wavelength region in a fluorescence spectrum. The first fluorescent dye further has an absorption wavelength region which is different from the first ultraviolet absorption wavelength region and which overlaps at least a part of the second fluorescence emission wavelength region.

Fluorescent water-base ink for ink-jet recording

A water base ink set for ink-jet recording includes a water base ink which contains an acid dye, and a water base ink which contains a basic dye. The water base ink contains a polymer which has an average molecular weight of 3,000 to 20,000 and which is represented by the following formula (1):  wherein X represents H or COONa, and Y represents H, COONa, SONa, or CHOR in the formula (1). R represents a substituted group having SONa with carbon atom or atoms of a number of 1 to 5. When the ink containing the acid dye and the ink containing the basic dye are mixed with each other, then the head discharge section is prevented from any clog-up, and it is possible to perform the stable jetting operation.

Water base ink set for ink-jet recording

A fluorescent water base ink for ink-jet recording contains a fluorescent dye having a xanthene skeleton, and a glycol. In the fluorescent dye, the difference in hydrophilic index log P is not less than 2.6 between a substituent bonded to C-9 carbon atom of the xanthene skeleton and other portion of the fluorescent dye than the substituent bonded to the C-9 carbon atom. The glycol has a distance between hydroxyl groups substantially equivalent to or longer than an interatomic distance between atoms directly bonded to C-3 and C-6 carbon atoms of the xanthene skeleton of the fluorescent dye, respectively. It is assumed that the glycol is coordinated with the xanthene skeleton in a bridge form to increase the fluorescence intensity by increasing the electron density of the xanthene skeleton. The ink having high fluorescence intensity and in which the fluorescence intensity is not lowered in a time-dependent manner is provided.

A fluorescent water base ink for ink-jet recording to be used for an ink-jet printer contains water, a pigment, a compound having primary or secondary amide group, and a fluorescent dye represented by the following formula (1): wherein Rrepresents OH or N(R)R, Rrepresents hydrogen atom or halogen atom, and each of Rand Rrepresents hydrogen atom or alkyl group. A sufficient OD value and a fluorescence value are obtained while securing the vivid color development and the excellent water resistance principally in accordance with the interaction of the fluorescent dye and the compound having the amide group.

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Ichinomiya, Japan

Masashi Tsuda