The rapid fading on polyester fibres of certain blue anthraquinone disperse dyes under normal conditions of exposure is due to the ease of photochemical de‐alkylation of their substituted‐amino groups. The products of the photoelimination reaction for a series of dyes have been identified, and a mechanism for the reaction is proposed. The higher photochemical stability of these dyes on cellulose acetate and nylon is perhaps due to hydrogen bonding of the alkylamino groups to the polymer. The influence of wavelength of irradiation, oxygen, moisture and the physical structure of the polymer is discussed.
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Giles et al. (1972) studied this question.
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