Ricoh Company, Ltd.

Akiko Konishi

Kiyofumi Nagai

Masayuki Koyano

Akio Kojima

Masato Igarashi

Takanori Tsuyuki

Hiroyuki Mochizuki

Ikuko Tanaka

Tetsuro Suzuki

Kakuji Murakami

Toshiaki Tokita

Masayuki Shoshi

Yasuo Miyoshi

Masao Yoshikawa

Megumi Kawahara

Masakatsu Shimoda

Ikuko Yamada

Tetsuya Kaneko

Toshiaki Takahashi

Kiyoshi Tanikawa

A recording ink, includes: a coloring agent; a surfactant; a penetrant; and a defoaming agent. The recording ink includes 3.0&#xd7;10(quantity/5 &#x3bc;l) or less coarse particles each having a particle diameter of 0.5 &#x3bc;m or more, and an amount of a particle having a particle diameter of from 1 &#x3bc;m to under 5 &#x3bc;m in the coarse particles is 1% by number or less.

Recording ink and manufacturing method thereof, ink cartridge, ink recorded matter, inkjet recording apparatus, and inkjet recording method

An image recording method for forming an image on a recording material includes the steps of (a) applying to a recording material a colorless or light colored image recording acceleration liquid containing a compound which is capable of making insoluble a coloring agent contained in a recording liquid which comprises the coloring agent and a solvent for dispersing or dissolving the coloring agent, and (b) depositing the recording liquid imagewise on the recording material by ejecting the recording liquid in the form of droplets onto the recording material, the image recording acceleration liquid further containing at least one of surfactants represented by any of formulae (1) to (5) as specified in the specification, and an image formation apparatus for carrying out the above image formation method is provided.

Image recording method image recording apparatus and image recording acceleration liquid

An aqueous ink composition contains a colorant and a humectant, and has a surface tension &ggr; of less than 50 mN/m when measured by a maximum bubble pressure method at 25&deg; C., with a bubble frequency &ngr; of the aqueous ink composition being set at less than 1 Hz, and a surface tension &ggr; of more than 40 mN/m when measured by the maximum bubble pressure method at 25&deg; C., with the bubble frequency &ngr; of the aqueous ink composition being set at more than 5 Hz. In addition, an ink-jet printing method for forming ink images on an image-receiving medium has the step of ejecting the above-mentioned aqueous ink composition in the form of droplets according to the recording signals at a recording frequency of 8 kHz or more.

Aqueous ink compositions and ink-jet printing method using the same

An aqueous ink composition contains a colorant and a humectant, and has a surface tension .gamma. of less than 50 mN/m when measured by a maximum bubble pressure method at 25.degree. C., with a bubble frequency .nu. of the aqueous ink composition being set at less than 1 Hz, and a surface tension .gamma. of more than 40 mN/m when measured by the maximum bubble pressure method at 25.degree. C., with the bubble frequency .nu. of the aqueous ink composition being set at more than 5 Hz. In addition, an ink-jet printing method for forming ink images on an image-receiving medium has the step of ejecting the above-mentioned aqueous ink composition in the form of droplets according to the recording signals at a recording frequency of 8 kHz or more.

Aqueous ink composition and ink-jet printing method using the same

A recording ink composition contains a colorant which is soluble or dispersible in water and includes at least one phthalocyanine compound of formula (1) which may have a halogen atom as a substituent and at least one of phthalocyanine compounds of formulas (2) and (3); a dispersant which includes at least one polymeric compound having a hydrophilic moiety and a hydrophobic moiety, and/or at least one surfactant having an alkyl group having 5 or more carbon atoms; water; and a humectant. In addition, images with a resolution of 10 dots/mm.times.10 dots/mm or more can be recorded on an image receiving medium by ejecting the above-mentioned recording ink composition in the form of droplets by the application of thermal or mechanical energy thereto onto an image receiving medium with a Stockigt size degree of 3 seconds or more, with the recording ink composition being deposited in an amount of 20 pl/mm.sup.2 to 200 pl/mm.sup.2 on the image receiving medium.

Recording ink composition and recording method using the same

A recording ink composition includes a colorant comprising a pigment which is soluble or dispersible in water, and a polymeric dye having a weight average molecular weight in a range of 5,000 to 15,000, a dispersant including at least one dispersant component selected from the group consisting of at least one polymeric compound having a hydrophilic moiety and a hydrophobic moiety, and/or at least one surfactant having an alkyl group having 5 or more carbon atoms, water, and a water-soluble organic solvent, and a method of recording images on an image receiving medium is performed, using the recording ink composition.

An aqueous ink composition includes a dye component which contains a water-soluble xanthene dye or a water-soluble phthalocyanine dye, each of which includes a moiety of formula (I) when the water-soluble dye is in the form of a free acid, ##STR1## a surfactant. By use of this aqueous ink composition, a method of forming images on an image receiving medium is performed which includes the step of ejecting the aqueous ink composition in the form of droplets by the application of thermal or mechanical energy thereto onto an image receiving medium with a Stockigt size degree of 3 seconds or more as defined in the Japanese Industrial Standards P-8122.

Aqueous ink composition and image formation method using the same

A device for removing a film-like image forming substance from a recording medium for thereby regenerating the medium. A supply section supplies to the medium a water-containing removal accelerating liquid which causes a swelling layer of the medium to swell more than the substance provided on the medium. A separating section presses, after the liquid has been supplied to the medium, a separating member against the medium with or without heating to thereby transfer the substance from the medium to the separating member and thereby regenerates the medium. A cleaning section removes impurities deposited on the separating member.

Device for removing a film-like image forming substance from a recording

A yellow ink composition for ink jet printing is composed of an aqueous solution which includes a water-soluble dye which containing (a) a dye compound of formula (I), ##STR1## and (b) at least one of a dye compound of formula (II) ##STR2## or a dye compound of formula (III) ##STR3## a surfactant, and a wetting agent. By use of this ink composition, a method of forming images on an image receiving medium is performed which includes the step of ejecting the aqueous ink composition in the form of droplets by the application of thermal or mechanical energy thereto onto an image receiving medium with a Stockigt size degree of 3 seconds or more.

Yellow ink composition for ink-jet printing and image recording method

In a device for recycling a recording medium by removing a film-like image forming substance from the medium, a separating member contacts one side of the medium carrying the substance. The separating member is durable because its surface contacting the medium is provided with a measure against deterioration. Anticorrosion means reduces the deterioration rate of the separating member.

Device for removing a film-like image forming substance

This invention provides an aqueous ink composition, in which the composition satisfies several requirements for properties of an ink for ink-jet printing, has a superior tone for magenta color and has an improved waterfastness. The aqueous ink composition comprises a dye, water and a huemectant, the dye comprising a dye of a general formula (I): ##STR1##

Aqueous ink and method for recording image with the aqueous ink

An electrophotographic photoconductor is composed of an electroconductive substrate, and a photoconductive layer formed thereon, which contains a charge generating material, and a vinylidene compound of formula (I): ##STR1## wherein Ar represents an aromatic group; and X represents cyano group, an alkyl group having 1 to 8 carbon atoms, or an alkoxycarbonyl group represented by --COOC.sub.n H.sub.2n+1, in which n is an integer of 1 to 8; or a vinylidene compound of formula (II):

Electrophotographic photoconductor

An electrophotographic photoconductor is composed of an electroconductive substrate, and a photoconductive layer, formed thereon, which contains a charge generating material, and a vinylidene compound of formula (I): ##STR1## wherein Ar represents a metallocene group; and X represents cyano group, an alkyl group having 1 to 8 carbon atoms, or an alkoxycarbonyl group represented by --COOC.sub.n H.sub.2n+1, in which n is an integer of 1 to 8; or a vinylidene compound of formula (II):

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Tokyo, Japan

Akiko Konishi