Sony Chemicals Corporation

Yukiko Murasawa

Hideaki Takahashi

Jun Takahashi

Akio Ito

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.

Recording material for back-printing

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.

Recording sheet

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.

Recording material for back printing

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.

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 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.

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Kanuma, Japan

Yukiko Murasawa