Ricoh Company, Ltd.

Shigeo Hatada

Keishi Taniguchi

Shin Hasegawa

Akihiko Matsuyama

Hideki Sato

Minoru Hakiri

Manabu Seo

Yuji Natori

Yasuyuki Hosogi

Yuuki Yokohama

Ichiroh Fujii

Shigeru Kusakata

Masami Iguchi

Shinya Hanatani

Takanori Tsuyuki

Hirotaka Unno

Moriaki Saito

Hideki Satoh

Michio Urata

Hiromitsu Mizuno

Yunong Ji

The present invention provides an inkjet ink containing at least a colorant, water, a water insoluble resin, a fluorine surfactant, and a polyether-modified silicone oil, wherein the polyether-modified silicone oil has a hydrophobic value of 0.40 to 1.5, and the hydrophobic value is expressed by Equation 1;Hydrophobic value=&#x2003;&#x2003;Equation 1

Inkjet ink, and ink cartridge, inkjet recording method, inkjet recording apparatus and ink record using the same

The present invention provides an inkjet ink containing at least a colorant, water, a water insoluble resin, a fluorine surfactant, and a polyether-modified silicone oil, wherein the polyether-modified silicone oil has a hydrophobic value of 0.40 to 1.5, and the hydrophobic value is expressed by Equation 1:Hydrophobic value=&#x2003;&#x2003;Equation 1

The object of the present invention is to provide a water-based pigment dispersion containing a pigment, a dispersing agent, a resin emulsion, and water, the water-based pigment dispersion is subjected to a heat treatment. The present invention also provides a water-based pigment ink containing the water-based pigment dispersion, a dispersing agent, a resin emulsion, and water.

Water-based pigment dispersion, production method thereof, water-based pigment ink, production method thereof, ink record, inkjet recording apparatus, and inkjet recording method

The present invention provides a pigment dispersion that contains a carbon black, a dispersing agent and water, wherein the carbon black is any one of a channel black and a gas black, the dispersing agent is a sodium naphthalenesulfonate formalin condensate, and the total content of a dimer, a trimer and a tetramer of naphthalenesulfonate in the sodium naphthalenesulfonate formalin condensate is 20% by weight to 80% by weight. The present invention also provides an inkjet ink using the pigment dispersion.

Pigment dispersion, inkjet-ink using the pigment dispersion, image forming process, and image forming apparatus

A method of sealing a liquid container, including filling a liquid into a liquid containing bag including a cylindrical inlet; and sandwiching the cylindrical inlet with a pair of heat-sealing heads upon application of heat such that the cylindrical inlet is sealed with the liquid therein, wherein at least one of the pair of heat-sealing heads comprises a concave edge.

Method of sealing a cylindrical inlet of a bag

A method for manufacturing a composition including: mixing a basic material with a pigment dispersion including at least a pigment and water; and then subjecting the mixture of the basic material and pigment dispersion to a heat treatment. This composition is useful as an inkjet ink composition. An inkjet ink composition including at least pigment, water and a basic material, and has a pH of from 6.5 to 11.0 is also provided. An image forming method including discharging the composition from a nozzle to form an ink image on a receiving material is provided.

Inkjet ink composition, method for manufacturing the inkjet ink composition and image forming method using the inkjet ink composition

A mixing device for preparing an ink including: a mixing vessel including an injection nozzle and a discharge opening, both of which are provided on a bottom surface of the mixing vessel, wherein the injection nozzle faces in substantially a horizontal direction along a side surface of the mixing vessel to swirl the ink along the side surface, and the discharge opening is located on a downstream side from the injection nozzle relative to the swirling direction and at a position between the center of the bottom surface and the side surface; a connector connecting the injection nozzle with the discharge opening; and a pump configured to transport the ink from the discharge opening to the injection nozzle through the connector and inject the ink into the mixing vessel from the injection nozzle while applying a pressure to the ink.

INK MIXING DEVICE, INK MANUFACTURING APPARATUS, METHOD FOR WASHING THE INK MANUFACTURING APPARATUS, METHOD FOR MANUFACTURING INK, INK, INK CARTRIDGE CONTAINING THE INK, IMAGE FORMING METHOD AND APPARATUS USING THE INK, AND PRINT IMAGE PRODUCED BY THE IMAGE FORMING METHOD AND APPARATUS

Pigment dispersion, inkjet ink composition using the pigment dispersion, method of manufacturing the inkjet ink composition and image forming method using the inkjet ink composition

An image transfer sheet including a substrate, an image transfer layer formed overlying one side of the substrate, and a surface layer which is formed overlying the transfer layer and which includes a resin, wherein the resin has a glass transition temperature of from 27&deg; C. to 100&deg; C.

Image transfer sheet, method for forming image on the image transfer sheet and image transfer method using the image transfer sheet

The pigment dispersion liquid is produced using at least a pigment, liquid medium, and a dispersant, as follows. That is, a mixture consisting of at least the pigment, liquid medium and the dispersant is held under a pressure which is less than the atmospheric pressure and then the mixture is held under a pressure equal to or higher than the atmospheric pressure. Finally, dispersion is carried out.

Pigment dispersion liquid and method of producing the same

An image transfer sheet (1) includes a support having water permeability, and a releasing layer, an adhesive layer, and an image transfer layer which are overlaid in this order on the support, the surface of the adhesive layer having an inclined-type ball tack value of 6 or less as measured in accordance with a procedure defined in Japanese Industrial Standards (JIS) Z 0237 when the image transfer sheet is immersed in water and the support is peeled away therefrom, and an image transfer sheet (2) includes a support having water permeability, and a releasing layer, an adhesive layer comprising a pressure-sensitive adhesive material, and an image transfer layer which are overlaid in this order on the support, the pressure-sensitive adhesive material having an inclined-type ball tack value of 11 or less as measured in accordance with a procedure defined in Japanese Industrial Standards (JIS) Z 0237. An image formation method and an image transfer method, using any of these image transfer sheets are provided.

Fluid-releasable image transfer sheet

An image transfer sheet which includes a water-permeable supporter, a release layer which is formed overlying the water-permeable supporter and which includes a water-soluble resin, and an image bearing layer which is formed overlying the release layer and includes a resin and on which an image is to be born, wherein a ratio L,/L,is not less than 0.99, where L,represents a length of one side of the image bearing layer when measured before the image transfer sheet is dipped into water, and L,represents a length of the side of the image bearing layer when measured by setting the image bearing layer on an acrylic plate after the image transfer sheet is dipped into water and the image bearing layer is released from the water-permeable supporter.

Image transfer sheet and image forming method using the image transfer sheet

An image transfer sheet has a support with water permeability, and a releasing layer, an adhesive layer and an image transfer layer which are successively overlaid in this order on the support, the adhesive layer having a surface covering area ratio of 90% or more with respect to a surface area of the image transfer layer when the image transfer sheet is immersed in water and the support is peeled away therefrom, or a surface covering area ratio of 40% or more with respect to a surface area of the releasing layer. A toner image is formed on the above-mentioned image transfer sheet by electrophotography, or a thermofusible ink image or a sublimable dye image is formed thereon, or an aqueous ink image or a thermofusible ink image is formed thereon by an ink jet printing method, and such an image formed on the image transfer sheet is transferred to an image receiving material.

Image transfer sheet, preparation method thereof and image formation method and image transfer method using the image transfer sheet

An image transfer sheet has a support, a transfer layer formed on one side of the support, and a backing layer formed on the other side of the support, opposite to the transfer layer with respect to the support, the backing layer containing a silicone material which is in a solid state at room temperature. An image is formed on the transfer layer of the above-mentioned image transfer sheet by various image forming methods, and the image-bearing transfer layer of the image transfer sheet is transferred to an image-receiving member by the application of heat and/or pressure thereto.

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Numazu, Japan

Shigeo Hatada