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The effect of polycation on the light fastness of CI Acid Red 249
Author(s) -
Oka Hidetaka,
Kimura Akira
Publication year - 1995
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1995.tb01676.x
Subject(s) - cationic polymerization , chemistry , singlet oxygen , dyeing , aqueous solution , photochemistry , ammonium , oxygen , red light , polymer chemistry , organic chemistry , botany , biology
Cationic compounds are frequently used in direct dyeing processes and in ink‐jet printing as dyefixing agents. In some cases, however, they can reduce the light fastness of dyes used. This report deals with the effect of a polycationic compound, Polyfix 601, on the light fastness of CI Acid Red 249, an anionic 2‐phenylazo‐1‐naphthol dye, in aqueous solutions and in PVA films. As a comparison, the much smaller ammonium cation was used, which had no observable effect on hue or dye light fastness. However, some changes to the dye's physical properties were observed. The effect of the polycation is explained as a consequence of dye aggregation, facilitated by presence of polycation. Self‐sensitised singlet oxygen seemed to play no part in dye photofading, but other oxygen species could participate in the process.