染料の吸収スペクトルに関する研究

第4報 若干の含銅酢塩染料の乾熱変色

抄録

Some direct blue dyes, such as Dianil Blue G, Benzo Azurine G and Chlorazol Sky Blue FF, and three copper complex dyes derived from above dyes are selected and used. The maximum wave length of these spectra of complex dyes in solutions is shifted toward shorter wave length side, as compared with these of the original dyes.
The absorption spectra of viscose films dyed or treated with 1% CuSO₄ aqueous solution after dyed are measured, and the deformation of these spectra by dry heating until 85°C, is discussed.
The results of the experiments are shown as follows:
(a) The spectra of films dyed with former blue dyes deformed by dry heating. By increasing the temperature, the absorption curve is reduced at red side of the main absorption band. The rate of this deformation is comparatively accelarated by introduction of NH₂ groups at peri-positions of OH groups, such as Blue FF.
(b) By the aftertreatment with CuSO₄ aq. solution, these changes of color on dyed films are generally reduced.
(c) No deformation of the absorption curve is observed by heating in the case of the film dyed with complex dye of Dianil Blue G, but the orther complex dyes are slightly deformed. The color change of the films dyed with complex dyes is similer to those of copper aftertreatedfilms.