The purpose of this paper is to enhance the limited fluorescence of mica titania (MT) effect pigments by coating them with peripherally substituted zinc phthalocyanines (ZnPc).
The effects of deposition medium, temperature, time, initial organic pigment/MT ratio on deposition behaviour and efficiencies were investigated separately for ZnPc, nitro (TNZnPc) and amino (TAZnPc) substituted ZnPc’s.
TNZnPc could be deposited in the form of well-defined crystals on MT with per cent 64 ± 5 efficiency in chloroform at 50°C within 5 h and the amount deposited was linearly dependent on the initial TNZnPc concentration. TNZnPc fluorescence emissions, which appear mainly at 460 and 685 nm in pure pigments, could be observed in combination with MT (MT-TNZnPc) as well. A spectral analysis on the non-overlapping region of the spectrum with two different excitations (385 and 630 nm) revealed that, respectively, up to threefold to sixfold increase is possible to attain, depending on the excitation wavelengths.
Efficiency of deposition could not be taken above per cent 11 ± 4 with TAZnPc. Although ZnPc could be deposited with per cent 57 ± 3 efficiency, the pigment was not effective in imposing its fluorescence characteristics over MT.
Combining inorganic effect pigments with organic dye molecules is an idea that has been elaborated mainly for producing different colour effects and stabilization of dye molecules against agglomeration. Here, for the first time, it is used to enhance the fluorescence of the effect pigments.
Authors would like to thank; Professor Dr Ahmet Önal for his invaluable advice and help in fluorescence measurements of TNZnPc, Professor Dr Vefa Ahsen for his advices on phthalocyanine purification, and Kar Kimya San. Ltd. Şti. and Betek Boya San. A.Ş. for providing the resins of some paints produced in these studies. Authors also acknowledge the partial financial supports provided by Orta Doğu Teknik Üniversitesi (Grant No’s: BAP-07-02.2009.00.01, BAP-2011-03-04-10).
Erratum: It has been brought to the attention of the publisher that the article Sevinc Sevim Kahya, Yasemin Sonmez, Gungor Gunduz and Bora Mavis, “Combination effect pigments with enhanced fluorescence”, published in Pigment and Resin Technology, failed to include an acknowledgment and the appendix containing supplementary data. The publisher apologises for any confusion and inconvenience caused.
Kahya, S.S., Sönmez, Y., Gündüz, G. and Mavis, B. (2019), "Combination effect pigments with enhanced fluorescence", Pigment & Resin Technology, Vol. 48 No. 4, pp. 277-292. https://doi.org/10.1108/PRT-07-2018-0069
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