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 63, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • Preparation of Ultra-fine CaCO3 Particles Utilizing Nonionic W/O Microemulsions
    Kijiro KON-NO, Nobuhiko SHIZUKA
    1990 Volume 63 Issue 2 Pages 65-70
    Published: February 20, 1990
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.63.65
    JOURNAL FREE ACCESS
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    Ultra-fine CaCO3 particles were prepared by CO2 bubbling a into a system consisting of hexaethyleneglycol dodecyl ether/aqueous Ca(OH)2/cyclohexane. Spherical and monodispersed CaCO3 particles having 100 and 70Å in diameter were formed in a colorless and a blue translucent regions, respectively in the solubilization system of the aqueou Ca(OH)2. The size of the particles was independent on the amount of aqueous Ca(OH)2 and the concentration of surfactants. The obtained particles were a mixtured of calcite and vaterite. The ratio of these components differed in the cololess and the blue translucent ragions. The vaterite was transformed into calcite in any region and the rate constants were in the order of 10-6 sec-1.
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  • Thermal Properties of Films Prepared from Japanese Lacquer
    Toshio OGAWA
    1990 Volume 63 Issue 2 Pages 71-76
    Published: February 20, 1990
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.63.71
    JOURNAL FREE ACCESS
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    Thermal properties of films prepared from a raw Japanese lacquer were examined by means of the thermomechanical analyzer (TMA), the thermogravimetric analyzer (TGA) and the differential scanning calorimeter (DSC). TGA thermograms were obtained using a large amount of samples (ca. 100mg) to detect a small change of weight loss in the temperature range below 120°C. A several percent of weight loss in TGA thermograms and an endothermic peak in DSC thermograms were ascribed to an evaporation of water contained in films. The amount of water varied depending upon the exposure condition of the films. An exothermic peak in DSC thermograms appeared around 140°C, accompanied with a contraction of the films. These phenomena were attributed to a development of crosslinked structure in this high temperature region. Any large difference was not observed in the above thermograms among lacquers prepared, i. e., clear lusterless or lustrous, and black lusterless orlustrous Japanese lacquers. However, the contraction of the black lacquers above 140°C was slightly smaller than that of the other lacquers.
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  • Thermosetting Emulsion Polymer for Coating
    Akira TOMINAGA
    1990 Volume 63 Issue 2 Pages 77-81
    Published: February 20, 1990
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.63.77
    JOURNAL FREE ACCESS
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  • Polymer Emulsions for Paints
    Yasuharu NAKAYAMA
    1990 Volume 63 Issue 2 Pages 82-92
    Published: February 20, 1990
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.63.82
    JOURNAL FREE ACCESS
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  • Evaluation on the Efficacy of Cosmetics
    (II) Evaluation by using image analysis
    Shoji HAYASHI
    1990 Volume 63 Issue 2 Pages 93-97
    Published: February 20, 1990
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.63.93
    JOURNAL FREE ACCESS
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