Abstract: A recording material for back-printing contains (i) a back-printing sheet comprising a transparent substrate, an ink-absorbing layer that is provided on the transparent substrate, and a porous ink-receiving layer that is provided on the ink-absorbing layer and has filler dispersed in a binder resin, and (ii) a back-printing sheet cover film having a cover substrate, and an adhesive layer that has an adhesive resin and is formed on the cover substrate, the refractive index of the filler and the refractive index of the adhesive resin are different to one another. Specifically, the difference between the refractive index of the filler and the refractive index of the adhesive resin is at least 1.0.

Abstract: A recording sheet adaptable to print an image using pigment ink, on which a smear is hardly generated, is provided. A recording sheet includes an ink permeable layer prepared by adding 3-30 parts by weight of a nonionic surfactant including an amine compound as a main component to 30 parts by weight of a water-insoluble component including an inorganic filler and a binder as main components. Ink applied on such an ink permeable layer is directly absorbed into the layer in a depth direction without dispersing in a lateral direction. Therefore, any smear (banding) is hardly generated on a printed image formed on the recording sheet using ink.

Abstract: A white inkjet ink is formed from a photoreactive polyfunctional monomer, a white pigment, and a photopolymerization initiator, and the viscosity at 40° C. is adjusted to 13 mPa·s or less. An &agr;-hydroxyketone compound or benzyl dimethyl ketal compound is preferably used as the photopolymerization initiator.

Abstract: A recording material for back printing has a transparent substrate; an ink absorbing layer that is provided on the transparent substrate; and a porous ink transmitting layer that is provided on the ink absorbing layer and comprises a filler dispersed in a binder resin, where ink transmitting layer is crosslinked.

Abstract: An ink jet recording sheet having high ink-absorbing ability is disclosed. A porous structure is formed inside of an ink-permeable layer of a recording sheet according to the invention. The total volume of pores having a radius ranging between 100 nm or more and 10000 nm or less is 0.06 cm3/g or more owing to the porous structure. Therefore, ink applied to the surface of the ink-permeable layer is permeated vertically through the porous structure and blurring is therefore scarcely caused. Also, an ink-absorbing layer having hydrophilic a resin has high ink-absorbing capacity. The ink permeated through the ink-permeable layer is absorbed in the ink-absorbing layer and fixed, so that it is not diffused in the recording sheet. Therefore, the recording sheet has high ink-absorbing ability and is therefore free from blurring and enables high print density also when it is used for printing in an ink jet system.

Abstract: A recording sheet for use with inkjet printers which achieves high color density while being free of bleeding is provided. The recording sheet has an ink-receiving layer and an ink permeable layer arranged on a surface of the ink-receiving layer. The ink permeable layer includes a filler, a surfactant, and a binder. The surfactant includes a fluorosurfactant having perfluoro-alkyl groups in its chemical structure. The ink permeable layer is made hydrophobic as well as lipophobic since hydrophilic groups on the surfaces of the filler particles will be covered by perfluoro-alkyl groups of the fluorosurfactant. This prevents aqueous ink added an organic solvent from dispersing within the ink permeable layer. The ink permeable layer includes a binder containing a water-insoluble resin having a hydroxyl value of 4 or higher (mgKOH/g) to lower the affinity to the ink.

Abstract: The recording sheet has an ink-receiving layer and an ink permeable layer. The ink permeable layer is arranged on a surface of the ink-receiving layer and includes a filler and a binder. The binder contains as a primary component a water-insoluble polyester resin having a high hydroxyl value in the range of 25 to 65. The ink permeable layer 13 has a significant ink phobicity. The ink permeable layer does not contain a surfactant and is low lipophilic. Thus, when it receives ink containing an organic solvent, the ink does not disperse within the ink permeable layer to provide printed images without bleeding.

Abstract: A recording material for back-printing contains (i) a back-printing sheet comprising a transparent substrate, an ink-absorbing layer that is provided on the transparent substrate, and a porous ink-receiving layer that is provided on the ink-absorbing layer and has filler dispersed in a binder resin, and (ii) a back-printing sheet cover film having a cover substrate, and an adhesive layer that has an adhesive resin and is formed on the cover substrate, the refractive index of the filler and the refractive index of the adhesive resin are different to one another. Specifically, the difference between the refractive index of the filler and the refractive index of the adhesive resin is at least 1.0.

Abstract: A recording sheet for use with inkjet printers which achieves high color density while being free of bleeding is provided. The recording sheet has an ink-receiving layer and an ink permeable layer arranged on a surface of the ink-receiving layer. The ink permeable layer includes a filler, a surfactant, and a binder. The surfactant includes a fluorosurfactant having perfluoro-alkyl groups in its chemical structure. The ink permeable layer is made hydrophobic as well as lipophobic since hydrophilic groups on the surfaces of the filler particles will be covered by perfluoro-alkyl groups of the fluorosurfactant. This prevents aqueous ink added an organic solvent from dispersing within the ink permeable layer. The ink permeable layer includes a binder containing a water-insoluble resin having a hydroxyl value of 4 or higher (mgKOH/g) to lower the affinity to the ink.

Abstract: The recording sheet has an ink-receiving layer and an ink permeable layer. The ink permeable layer is arranged on a surface of the ink-receiving layer and includes a filler and a binder. The binder contains as a primary component a water-insoluble polyester resin having a high hydroxyl value in the range of 25 to 65. The ink permeable layer 13 has a significant ink phobicity. The ink permeable layer does not contain a surfactant and is low lipophilic. Thus, when it receives ink containing an organic solvent, the ink does not disperse within the ink permeable layer to provide printed images without bleeding.

Abstract: An ink jet recording sheet having high ink-absorbing ability is disclosed. A porous structure is formed inside of an ink-permeable layer of a recording sheet according to the invention. The total volume of pores having a radius ranging between 100 nm or more and 10000 nm or less is 0.06 cm3/g or more owing to the porous structure. Therefore, ink applied to the surface of the ink-permeable layer is permeated vertically through the porous structure and blurring is therefore scarcely caused. Also, an ink-absorbing layer having hydrophilic a resin has high ink-absorbing capacity. The ink permeated through the ink-permeable layer is absorbed in the ink-absorbing layer and fixed, so that it is not diffused in the recording sheet. Therefore, the recording sheet has high ink-absorbing ability and is therefore free from blurring and enables high print density also when it is used for printing in an ink jet system.

Abstract: A recording sheet is provided, which difficultly undergoes handing of printed images formed thereon and which can permit to print with a pigment ink. In the recording sheet of the invention, an ink-permeable layer contains a filler and a surfactant of 9.0 or less in HLB value and surface of the filler particles is in a state of being covered with lipophilic groups of the surfactant, and thus an ink applied to the surface of the ink-permeable layer does not spread on the surface of the ink-permeable layer but is absorbed into the ink-permeable layer and, in the ink-permeable layer, the ink does not diffuse in the surface direction but migrates straight in the depth direction. Further, addition of a cation group-containing compound as a fixing agent to the ink-receiving layer of the recording sheet serves to improve fixing properties of the colorant in the ink-receiving layer, thus no banding occurring within the ink receiving layer as well.

Abstract: A recording material for back printing has a transparent substrate; an ink absorbing layer that is provided on the transparent substrate; and a porous ink transmitting layer that is provided on the ink absorbing layer and comprises a filler dispersed in a binder resin, where ink transmitting layer is crosslinked.

Abstract: A recording sheet adaptable to print an image using pigment ink, on which a smear is hardly generated, is provided. A recording sheet includes an ink permeable layer prepared by adding 3-30 parts by weight of a nonionic surfactant including an amine compound as a main component to 30 parts by weight of a water-insoluble component including an inorganic filler and a binder as main components. Ink applied on such an ink permeable layer is directly absorbed into the layer in a depth direction without dispersing in a lateral direction. Therefore, any smear (banding) is hardly generated on a printed image formed on the recording sheet using ink.

Abstract: An ink excellent in ink ejection smoothness from the nozzle of an ink jet printer is provided. The ink can be obtained by adding a colorant to a resin liquid containing either a photoreactive monofunctional monomer or a photoreactive bifunctional monomer or both of them and having a viscosity at 25° C. of from 1.0 mPa·s to 10.5 mPa·s. Moreover, through exposure of the surface of an image printed using this ink to ionizing radiation, the ink is cured and there is provided a firmly printed image. Furthermore, a printed product 1 having a firmly printed image of high quality is provided by printing an image on the surface of an ink-receiving layer 12 the main component of which is such a resin as polyester resin, acryl-styrene resin, epoxy resin, or phenoxy resin using the abovementioned ink.