Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
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Volume 67, Issue 5
Displaying 1-7 of 7 articles from this issue
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  • Studies on Viscoelastic Behavior of Coatings (III)
    Correlation between the Viscoelasticity of Paints and Misting Properties of Paints on Roll-coating
    Toshihide FUJITANI, JIM AKUI, Masahide KAWARAYA
    1994 Volume 67 Issue 5 Pages 285-292
    Published: May 20, 1994
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.67.285
    JOURNAL FREE ACCESS
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    The misting phenomenon of paint on roll-coating was studied and found to have a close relationship with the viscoelastic property of the coatings.
    And following results were obtained.
    (1) The degree of the misting depends upon the dynamic elasticity (storage modulus) G′ of the paint and that's optimum region of G′ exists. In this study, the optimum region of G′ was O.4~0.6 Pa at angular velocity 31.4 rad/s.
    When G′ is over O.6 Pa, there occures threading.
    And when G′ is under O.4 Pa, there occures misting.
    (2) The elasticity of the coatings is governed by the molecular weight distribution of the base resins. The higher the average molecular weight is, and the higher the fraction of high molecular weight molecule is, the greater the elasticity of the coatings becomes.
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  • Image Memorying System Using Electroconductive Particles
    Yuichi YASHIKI
    1994 Volume 67 Issue 5 Pages 293-299
    Published: May 20, 1994
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.67.293
    JOURNAL FREE ACCESS
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    A new xeroprinting master was developed for high speed copying process. This master can memorize an electrostatic latent image through the migration of electroconductive particles. The migration occurs when electroconductive particles are charged and the master is heated. The charging of particles is caused by carrier injection from the particles to the carrier transporting material in a softenable thermoplastic layer. The contrast becomes greater as the surface voltage of the master after migration (Vm, ) becomes lower. Therefore, the performance of master is good when Vm, is lower.
    In order to investigate the mechanism of the migration, experiments were carried out on the milling condition and the carrier injection capacity about ITO (Indium Tin Oxide) and ATO (Antimony Tin Oxide), which are typical electroconductive materials. Vm, was proved to be influenced by the particle size rather than the carrier injection capacity.
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  • Preparation of Microcapsules Containing Water-Absorbent Polymer and Silicon Carbide Powder
    Masato TANAKA, Hideki SATO, Isao KIMURA, Natsukaze SAITO
    1994 Volume 67 Issue 5 Pages 300-311
    Published: May 20, 1994
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.67.300
    JOURNAL FREE ACCESS
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    Microcapsules containing water-absorbent polymer, poly (sodium acrylate), were prepared by the drying-in-liquid method. Polystyrene was adopted as the wall material of the capsule. In order to improve the thermal conductivity of the microcapsule, an attempt was made to squeeze silicon carbide (SiC) powder into it. The SiC powder had been treated with a silane coupling agent at various conditions to change its affinity to the liquid-liquid system.
    In the experiment, the operating conditions, such as the degree of treatment of SiC, the polystyrene concentration in oil phase, the added amount of SiC, and the SiC particle size, were changed stepwise.
    It was investigated how the operating conditions affected the properties of microcapsules, such as the mean size, the contents of SiC and water-absorbent polymer, the absorption rate, and amount of saturation absorption, and the thermal conductive property.
    The microcapsules were observed by scanning electron microscopy and the state of dispersion of SiC powder in the microcapsules was analysed by electron probe microanalysis.
    The state of dispersion of SiC powder varied depending on the treatment condition. The microcapsule prepared was found to act as the medium of thermal storage.
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  • Adhesion and Pressure Sensitive Adhesion
    Hiroshi MIZUMACHI
    1994 Volume 67 Issue 5 Pages 312-319
    Published: May 20, 1994
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.67.312
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  • ASTM Standards for Paints, Varnish, Lacquer and Related Products
    Keizo OHTA
    1994 Volume 67 Issue 5 Pages 320-331
    Published: May 20, 1994
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.67.320
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  • Jntroduction to Understand Physical Properties of Coatings (II) Paint Production (1)
    Minoru TSUBOTA, Keigo KINOSHITA
    1994 Volume 67 Issue 5 Pages 332-337
    Published: May 20, 1994
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.67.332
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  • Surface Charge
    Hiroyuki OHSHIMA
    1994 Volume 67 Issue 5 Pages 338-344
    Published: May 20, 1994
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.67.338
    JOURNAL FREE ACCESS
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