Ricoh Company, Ltd.

Masaru Matsuda

Hiromitsu Kawase

A method of forming a toner image on an image transfer sheet include the steps of forming a latent electrostatic image on an image bearing member, developing the latent electrostatic image to a toner image, using a developer, and transferring the toner image to an image transfer sheet, with the developer having a carrier and a toner which contains a thermoplastic resin and a coloring agent having a chromatic color and capable of retaining the chromatic color even after the toner is sintered, and satisfying at least one of three conditions that (1) a toner concentration in the developer is in a range of 8 to 24 wt. %, (2) the toner has an absolute charge quantity value of 12 &mgr;C/g or less, and (3) a ratio of a true specific gravity of the carrier to that of the toner is in a range of 2 to 3. An image can be fixed on a heat-resistant solid surface by further attaching the toner image transferred to the image transfer sheet to a heat-resistant solid surface and sintering the toner image. Further, a developer and a toner image bearing transfer sheet are also disclosed.

Method of forming toner image on image transfer sheet, method of fire fixing image on heat-resistant solid surface, developer and toner image bearing transfer sheet

A toner composition useful for forming a single or full colored image on a transfer sheet, containing a coloring agent, and a binder resin, wherein the coloring agent contains a plural kinds of metal elements (a) which contribute to the color of the coloring agent and at least one kind of a metal element (b) which does not contribute to the color of the coloring agent. At least one of the metal elements (a) shows substantially the same two-dimensional distribution within an area of at least 1 square .mu.m as that of the metal element (b) when analyzed by an electron prove micro analyzer. By sintering a ceramic, such as a tile, on which the image-bearing transfer sheet has been applied, a pattern corresponding to the toner image is formed on the ceramic.

Toner composition and use thereof for forming sintered pattern on solid

A method of forming a toner image on an image transfer sheet include the steps of forming a latent electrostatic image on an image bearing member, developing the latent electrostatic image to a toner image, using a developer, and transferring the toner image to an image transfer sheet, with the developer having a carrier and a toner which contains a thermoplastic resin and a coloring agent having a chromatic color and capable of retaining the chromatic color even after the toner is sintered, and satisfying at least one of three conditions that (1) a toner concentration in the developer is in a range of 8 to 24 wt. %, (2) the toner has an absolute charge quantity value of 12 .mu.C/g or less, and (3) a ratio of a true specific gravity of the carrier to that of the toner is in a range of 2 to 3. An image can be fixed on a heat-resistant solid surface by further attaching the toner image transferred to the image transfer sheet to a heat-resistant solid surface and sintering the toner image. Further, a developer and a toner image bearing transfer sheet are also disclosed.

Method of forming toner image on image transfer sheet, method of fire

A toner composition useful for forming a single or full colored image on a transfer sheet, containing a finely divided coloring agent, and a binder resin, wherein the coloring agent includes a compound oxide pigment and a flux. By sintering a ceramic, such as a tile, on which the image-bearing transfer sheet has been applied, a pattern corresponding to the toner image is formed on the ceramic.

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Shizuoka, Japan

Masaru Matsuda