Conclusions
Optical bleaches (OB) retard the fading of colors obtained on polyester tricotage tubes which have been dyes with disperse blue-green or violet K, whose absorption bands do not overlap the fluorescence bands of the OB. The light-protective action of the OB is more significant the higher their light-resistance in the presence of a dye.
Optical bleaches accelerate photochemical degradation of disperse red J, whose molecules can absorb the blue-violet fluorescence of the OB.
OB compensate for the yellowness of the polymeric substrate, which is intensified on irradiation.
Fading of colors which have been prepared by an “OB-1 dye” combination leads not only to a decrease in color intensity, but is also accompanied by a change in color tone, due to yellowing of the substrate and the different rates of degradation of the dye and the OB.
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Literature cited
C. Călin, A. Mikai, and C. Stoenasky, Rev. Chem., 33, No. 2, 117–123 (1982).
Application of Color Science in the Textile Industry. A Collection of Articles [in Russian], L. I. Belen'kii and N. S. Ovechkin, Part I, Ledkaya Industriya, Moscow (1970).
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Additional information
Translated from Khimicheskie Volokna, No. 1, pp. 35–37, January–February, 1988.
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Bykova, I.N., Gomzina, I.K. & Andronova, A.P. Some features of the photochemical fading of colors in polymeric materials in the presence of optical bleaches. Fibre Chem 20, 51–54 (1988). https://doi.org/10.1007/BF00544764
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DOI: https://doi.org/10.1007/BF00544764