NIHON GAZO GAKKAISHI (Journal of the Imaging Society of Japan)
Online ISSN : 1880-4675
Print ISSN : 1344-4425
ISSN-L : 1344-4425
Volume 44 , Issue 5
Showing 1-10 articles out of 10 articles from the selected issue
Original Papers
General Papers
  • Takashi MAKINO, Yasuo IMURA, Akio HITACHI, Shohei IWATA, Jin MIZUGUCHI
    2005 Volume 44 Issue 5 Pages 342-346
    Published: 2005
    Released: July 01, 2006
    JOURNALS FREE ACCESS
    Triphenyl-pararosaniline (TPPR)is a charge-control agent (CCA) of the positive type for toners in the electrophotographic process. Suganami et al. reported that the charge control ability of TPPR is greatly improved if TPPR forms a charge-transfer (CT) complex with CCAs of the negative type, as those of n-propyl gallate (TPPR/PG=1/2), 3,5-di-tert-butylsalicylate zinc complex (TPPR/SZC=1/3) and 3,5-di-tert-butylsalicylate (TPPR/TBS=1/6). On the contrary, we interpret here the enhanced charge-control ability as arising from protonation of TPPR due to phenolic hydroxides of TBS, SZC and PG. The ratio of TPPR to these acids can be explained in terms of their effective acidity weakened significantly by intra-and intermolecular hydrogen bonds in the solid state, as revealed from structure analysis of these acids.
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  • —Latent pigment technologies in hydrogen bonded pigments and their regeneration process—
    Jin MIZUGUCHI
    2005 Volume 44 Issue 5 Pages 347-355
    Published: 2005
    Released: July 01, 2006
    JOURNALS FREE ACCESS
    Latent pigment technologies of hydrogen-bonded pigments(pyrrolopyrroles and quinacridones)have been reviewed and their potential problems when applied to imaging and related areas are discussed. The present technology aims at solubilizing hydrogen-bonded pigments by blocking NH…O intermolecular hydrogen bonds through t-butoxycarbonylation of the NH group. Regeneration is then carried out by heat treatment to give “pigment nano particles” characterized by high transparency. However,the crystalline phase of the regenerated pigment is found to be,not always,the same phase as that of the parent pigment. As a result, the color of regenerated pigments is slightly different and the light-and heat-fastness is inferior to that of the parent pigments. In addition,CO2 evolved during the regeneration process is found to impair the transparency of pigmented layers.
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Review Papers
  • Teruyasu HANAGAMI, Kaoru OGAWA, Yukie KONOSHITA
    2005 Volume 44 Issue 5 Pages 356-362
    Published: 2005
    Released: July 01, 2006
    JOURNALS FREE ACCESS
    The progress of medical network technology and dry film development have led to an increasing demand for decentralized Digital Film Imager within the field of medicine. This demand has been fulfilled by the “Film Station”, which has high image quality and high speed printing despite its compact size. “Film Station” is able to provide necessary diagnostic images wherever it is required. Our aim is to continue developing products like the “Film Station”, which can contribute at the diagnostic front.
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Imaging Today
“Production ; Introduction and application of technique relative to polymerization”
  • Hiroji FUKUI
    2005 Volume 44 Issue 5 Pages 364-368
    Published: 2005
    Released: July 01, 2006
    JOURNALS FREE ACCESS
    Solution polymerization, which is commonly carried out in industry to yield synthetic resins, was explained about the typical features. The general explanations for solution polymerization were given from the comparison of solution polymerization and other polymerization, polymerizable monomers for solution polymerization, reaction behavior occurred in polymerization, and the structures of yielded polymers.
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  • Haruma KAWAGUCHI
    2005 Volume 44 Issue 5 Pages 369-374
    Published: 2005
    Released: July 01, 2006
    JOURNALS FREE ACCESS
    Emulsion polymerization converts a monomer emulsion to a dispersion of polymer particles with submicron size. We can get desirable polymer particles employing suitable monomer,emulsifier,initiator,and other ingredients under suitable reaction conditions. This article presents the outline of mechanism and kinetics of emulsion polymerization and the strategy for particle design as well as new trends in emulsion polymerization.
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  • Masato TANAKA
    2005 Volume 44 Issue 5 Pages 375-380
    Published: 2005
    Released: July 01, 2006
    JOURNALS FREE ACCESS
    Suspension polymerization is the established polymerization method to prepare polymer beads with the size region from micron to thousand micron. In the suspension polymerization method, it is important to investigate how to make the suspension stable and how to control the polymer bead size. In the method for controlling polymer bead size,there are the soft type of technique by adjusting physical properties of liquids concerned and the hard type of technique by investigating the operating conditions as the geometry of reactor and the mixing condition. By suspension polymerization, composite particles with various structures can be prepared.
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  • Masaaki NAKAMURA, Yuji TATEMOTO
    2005 Volume 44 Issue 5 Pages 381-387
    Published: 2005
    Released: July 01, 2006
    JOURNALS FREE ACCESS
    The drying process is very important for the production of polymerized toner, since the quality of polymerized toner is dependent on the drying process. The dispersion of wet toner and the low drying temperature (less than 60degrees centigrade) are necessary for the drying of polymerized toner. In this paper, the drying technology of polymerized toner was introduced.
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Lectures in Science
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