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 51, Issue 2
Displaying 1-4 of 4 articles from this issue
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  • Perinone Pigments Derived from 4, 5-Diaminonaphthalic Acid (II)
    Hiroyuki NAKAZUMI, Toshiaki KASAZAKI, Teijiro KITAO
    1978 Volume 51 Issue 2 Pages 64-69
    Published: February 20, 1978
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.51.64
    JOURNAL FREE ACCESS
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    A number of benzophthaloperinone pigments were prepared by the reaction of 3, 4-diamino-7H- benzimidazo [2, 1-a] benz [de] isoquinolin-7-one with naphthalene dicarboxylic anhydrides in order to obtain organic pigments having the higher fastness properties as a substitute for heavy metal inorganic pigments.
    Those pigments showed a negative solvatochromism, viz., the absorption band of those was displaced to shorter wavelengths by basic solvents (30~80 nm). This effect was due to the stabilization of the enol form of the carbonyl group of those pigments in basic solvents. The effect of annelation and halogenation of pigment molecules on the absorption spectra was also discussed.
    It was found that the halogenation of pigment molecules improved the resistance to migration of the pigment, and the higher fastness properties were obtained by the combination of this halogenation and annelation of the molecule. Thus, benzophthaloperinone pigments (6) and (7) have good lightfastness and resistance to migration. But, coloured sheets (PVC, PE and PP) do not have enough brightness in colour.
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  • Hydrothermal Synthesis of CoLiPO4 Pigment from Co3 (PO4) 2 8 H2O and Li3PO4 as Starting Materials
    Seisirô ITÔ, Yosiyo KUBO, Tosihide KUWAHARA
    1978 Volume 51 Issue 2 Pages 70-74
    Published: February 20, 1978
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.51.70
    JOURNAL FREE ACCESS
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    CoLiPO4 pigment of reddish violet color was hydrothermally synthesized efficiently with the use of Co3 (PO4) 2.8H2O and Li3PO4 as starting materials.
    The best reddish violet color was hydrothermally synthesized as follows : Water was added to the equal molar ratio mixture of Co3 (PO4) 2.8H2O and Li3PO4, and the suspension was treated above 250°C for 3 hours in an autoclave.
    The hydrothermal synthetic process of CoLiPO4 was presumed to have such an intermediate product as cobalt hydroxide.
    All of the particle shapes of CoLiPO4 prepared by this method were cubic, and were not influenced by hydrothermal conditions.
    This hydrothermal synthetic method is considered to be suitable for the industrial preparation of, CoLiPO4 pigment.
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  • Application of Computer for Colour Materials
    Susao FUKUDA
    1978 Volume 51 Issue 2 Pages 75-83
    Published: February 20, 1978
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.51.75
    JOURNAL FREE ACCESS
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  • Stability of Pigment Dispersions
    Tethuro KAJINO
    1978 Volume 51 Issue 2 Pages 84-94
    Published: February 20, 1978
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.51.84
    JOURNAL FREE ACCESS
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