| abstract |
(57) [Abstract] (With correction) [Problem] To improve the light fastness of a dyed product. SOLUTION: By treating a fiber material, especially cotton, polyamide and wool with a novel compound of the following formula (1) useful as an ultraviolet absorber (UVA) and as a fluorescent whitening agent (FWA), the sun protection factor ( SPF) can be improved. [Wherein, M is hydrogen, an alkali metal atom, R 1 is hydrogen or hydroxy, R 2 is alkyl or phenyl, Y is- X represents NH, O, etc. such as C (= O) -NR 3 R 4 ] |