| 摘要 |
A process for improving the sun protection factor (SPF) of cellulosic fibre materials and blends thereof, which comprises contacting said materials with at least one compound of the formula (1): (Formule 1); in which M is hydrogen, an alkali metal atom, ammonium or a cation formed from an amine; R, and R,' independently of each other are -NH-R3, -N(R3)2 or -0-R3, wherein R3 is aryl substituted by -CO-X-R5, wherein X is O or NH and R5 is optionally substituted C1-C4-alkyl, R2 is a group of formula -0-R4 wherein R4 is hydroxy alkyl, alkoxy alkyl or hydroxy alkoxy alkyl, and R2' has the meaning of R1 or R2.
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