Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 69, Issue 11
Displaying 1-7 of 7 articles from this issue
  • Yukinori NAGAO, Yoshimi YATABE, Noriatsu MAEHARA, Yuichi MATSUMOTO, Yo ...
    1996 Volume 69 Issue 11 Pages 725-734
    Published: November 20, 1996
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    In order to obtain information on the dyeing mechanism of polyester fibers with azomethine dyes, we have investigated interactions between a polyester model and azomethine dyes through UV and visible absorption spectroscopy and application of a modified McRae's equation to the spectral data. Methyl benzoate was used as the polyester model. The orientation force of the azomethine dyes estimated from the equation was about 1 kcal/mol, which was about 5-14% of the total dye-methyl benzoate interaction. The sum of dispersion and induction force of the azomethine dyes estimated from the equation was 6-7 kcal/mol, which was about 85-95% of the total dye-methyl benzoate interaction.
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  • Effect of catalyst on curing reactions of the cross-linking system with epoxide
    Yoshinori NAKANE, Masahiro ISHIDOYA
    1996 Volume 69 Issue 11 Pages 735-742
    Published: November 20, 1996
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    The curing reactions of the carboxylic acid blocked by vinyl ether/epoxide cross-linking system were studied with the effect of catalyst.
    The useful catalysts for the deblocking reaction of the blocked carboxylic acid were protonic acids and Lewis acids, while those for the reactions of carboxylic acid/epoxide system were Lewis acids, bases, and onium salts. Further, both the deblocking reaction of the blocked carboxylic acid and the esterification of carboxylic acid with epoxide could be accelerated without the etherification of epoxide in the presence of a relatively weak Lewis acid such as zinc 2 - ethylhexanoate.
    The curing of this cross-linking system in the presence of the weak Lewis acid proceeded through the sequence of the following three steps : the deblocking reaction of the blocked carboxylic acid, the esterification of the regenerated carboxylic acid with epoxide, and the addition of vinyl ether to 2 -hydroxyalkyl ester produced by the esterification. 2 -Acetalalkyl ester produced by the addition was mainly obtained by the curing of this cross-linking system.
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  • Graft Polymerization of Vinyl Monomers Initiated by Peroxyester Groups Introduced onto Quinacridone Surface
    Hiroshi UENO, Tomoaki OGASAWARA, Masato KOBAYASHI, Takamitsu IIDA, Nor ...
    1996 Volume 69 Issue 11 Pages 743-749
    Published: November 20, 1996
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    To modify the surface of quinacridone, i.e. 5, 7, 12, 14-tetrahydroquino [2, 3-β] - acridine-7, 14-dione, the grafting of polymers onto the surface by polymerization of vinyl monomers, and its initiation by peroxyester groups introduced beforehand onto the surface, was investigated. The introduction of peroxyester groups onto quinacridone surface was achieved by the reaction of tert-butyl hydroperoxide with surface acyl chloride groups, which were introduced by the reaction of adipoyl dichloride with amino groups of quinacridone : the amount of peroxyester groups introduced onto the surface was determined to be 0.09 mmol/g by titration. It was found that the radical graft polymerization of vinyl monomers, such as methyl methacrylate (MMA) and N-vinyl-2-pyrrolidone (NVPD) were successfully initiated by surface tert-butyl peroxyester groups introduced onto quinacridone surface to give the corresponding polymer-grafted quinacridone : the percentage of grafting of polyMMA and polyNVPD was determined to be 25.2% and 26.1%, respectively. The grafting efficiency at the initial stage of the polymerization was about 50%, but immediately decreased with progress of the polymerization. This indicates that the formation of ungrafted polymer preferentially proceeds at the middle and last stage of the polymerization. Polymer-grafted quinacridone gave a stable dispersion in good solvent for grafted polymer.
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  • Motokazu ISHIMORI
    1996 Volume 69 Issue 11 Pages 750-760
    Published: November 20, 1996
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • Atsushi AOKI, Tokuji MIYASHITA
    1996 Volume 69 Issue 11 Pages 761-771
    Published: November 20, 1996
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • Katsumi KANDA, Yoshiyuki SUGIMTO
    1996 Volume 69 Issue 11 Pages 772-783
    Published: November 20, 1996
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • Norio TERAMAE, Toshio ISHIOKA
    1996 Volume 69 Issue 11 Pages 784-793
    Published: November 20, 1996
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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