Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 69 , Issue 10
Showing 1-7 articles out of 7 articles from the selected issue
  • Mitsuhiro YANAGITA, Susumu TAKAHASHI, Izuo AOKI
    1996 Volume 69 Issue 10 Pages 649-657
    Published: October 20, 1996
    Released: November 20, 2012
    JOURNALS FREE ACCESS
    In order to develop a novel lightfast fluoran leuco dye for thermosensitive recording papers, the relationship between the structure of fluoran compounds and their lightfastness has been studied. The photostability of fluoran compounds depends strongly on the kind of 6-substituted amino group on the xanthene ring. Fluoran compounds having a phenylenediamine moiety exhibited prominently good lightfastness compared with the conventional dye (1). It was demonstrated that a thermosensitive recording paper using 2', 4'-dimethyl-6'- {[4- (N, N-dimethylamino) phenyl] amino} spiro [isobenzofuran-1 (3H), 9'-[9H] xanthene] -3-one (2) exhibited outstanding lightfastness. The image formed on this thermosensitive recording paper had a bluish-black colour and absorbed over a wide range from visible to the near infrared region.
    Download PDF (932K)
  • Shuichi HAMADA, Yoshiyuki KUDO, Ichii ISHIYAMA
    1996 Volume 69 Issue 10 Pages 658-666
    Published: October 20, 1996
    Released: November 20, 2012
    JOURNALS FREE ACCESS
    Uniform octahedral copper (I) oxide particles, 1.4 μm in an average size, were produced by aging at 100°C for 30 min a mixed solution of 5.0 × 10-3 mol dm-3 copper (II) nitrate and [en] t/ [Cu2+] t of 2.3 at initial pHi 11.0. Morphology and size of the particles were affected by acidity of the starting solution. Reduction into copper (I) oxides took place over the limited concentration ratios of [en] t/ [Cu2+] t from 2.0 to 4.0 with the aid of aldehyde generated by partial degradation of 1, 2-ethanediamine. Monodispersed star shaped particles of copper (I) oxide were also obtained from the same copper (II) complex solutions in the presence of hexamethylenetetramine at initial pHi 11.2 and 100°C for 30 min. Furthermore, uniform rod-like copper (II) hydroxide sulfate particles were produced from 1, 2-ethanediaminocopper (II) solution at pHi 6.3 in the presence of a large amount of sulfate ions. The star shaped particles grew through a diffusion controlled process during the reaction, as confirmed by a chronomal analysis.
    Download PDF (1399K)
  • Yasushi KUBO, Makoto TSUJI
    1996 Volume 69 Issue 10 Pages 667-677
    Published: October 20, 1996
    Released: November 20, 2012
    JOURNALS FREE ACCESS
    D & C Red No. 6 (Rithol Bubin B), a pigment which is a Na salt of an anionic azo compound, was intercalated into mixed hydroxide layers of synthetic hydrotalcites with composition of [MgxAl1-x (OH) 2] x+ (An-) x/n· yH2O (0.2≤x≤0.33), where An-is an anion such as Cl-, OH- or CO32- located in the interlayer gallery and which can be replaced with the dye anion by ion-exchange. The ion-exchanged form of hydrotalcites was prepared by three methods : (1) by ion-exchanging a Cl-form of hydrotalcite with the dye anion in an aqueous solution, (2) by reacting a decomposed form of hydrotalcite calcined at 500°C with the dye anion in an aqueous solution and (3) by coprecipitating a dye-combined form of hydrotalcite directly from a mixed solution of metal salts, dye anion and NaOH. The alignment of interlayer dye anions which have planar configuration was determined by the method of preparation. Method (2) gave a flat setting parallel to the host layer, method (3) gave a perpendicular setting and method (1) gave mixed layers of the two settings. The perpendicular alignment allowed a higher dye anion content of up to 47 % compared to 30% for the parallel one. The hue of the coloured interlayer composite was a little more blue as compared to the original pigment. The dye elution was as low as 5 mg/L in 1% NaCl aqueous solution.
    Download PDF (1197K)
  • Mayumi KAKUTA
    1996 Volume 69 Issue 10 Pages 678-686
    Published: October 20, 1996
    Released: November 20, 2012
    JOURNALS FREE ACCESS
    Download PDF (825K)
  • Ken OKURA
    1996 Volume 69 Issue 10 Pages 687-698
    Published: October 20, 1996
    Released: November 20, 2012
    JOURNALS FREE ACCESS
    Download PDF (1612K)
  • Tatsuo SATO
    1996 Volume 69 Issue 10 Pages 699-707
    Published: October 20, 1996
    Released: November 20, 2012
    JOURNALS FREE ACCESS
    Download PDF (929K)
  • Kazuyuki NAKAI
    1996 Volume 69 Issue 10 Pages 708-712
    Published: October 20, 1996
    Released: November 20, 2012
    JOURNALS FREE ACCESS
    Download PDF (548K)
feedback
Top