Effect of Annellation on Photofading of Some Disperse Dyes

Abstract

The behavior of photofading of some anthraquinone, azo and quinophthalone disperse dyes, and coumarin derivatives on polyester or polyamide film hasbeen examined, The effect of Annellation on the fading and the mechanism of photofading reaction of these dyes and derivatives were discussed, 6, 7-Benzo(Annellation) derivatives of 1, 4-diamino- and 1, 4-dimethyl-amino-anthraqttinone were more resistant to photefading than the compounds that did not contain this configuration, 2-Hydroxy-1-naphthylazobenzene faded to light more rapid than the corresponding 2-hydrexyazobenzene. 3, 4-Benzo coumarin faded much less, and 5, 6-, 6, 7- and 7, 8-benzo derivatives faded more rapid than coumarin. The photofading of 5, 6- and 6, 7-benzoquinophthalones were more sensitive than that of quinophthalone. 5, 6-Benzo derivative faded much less and 6, 7-benzo derivative more rapid than the parent in hydroxyquinophthalone.