Tinuvin 171 Isomer mixture from the alkylation of 2-(2Hbenzotriazol-2-yl)-p-cresol with dodecane. 125304-04-3 Ciba Light stabilizer / UV-absorber >> Benzotriazole TINUVIN 171 is a liquid UV light absorber of the hydroxyphenylbenzotriazole class. Its absorption spectrum does not tail significantly into the visible region so it is an ideal UV absorber for those systems where initial yellowing must be kept to a minimum. TINUVIN 171 is particularly suitable for photographic applications such as chromogenic colour papers. The product is an isomer mixture from the alkylation of 2-(2Hbenzotriazol- 2-yl)-p-cresol with dodecane. Molecular weight: approx. 395 CAS No. 125304-04-3 $SSOLFDWLRQ TINUVIN 171 is recommended for photographic applications. It is particularly suitable for chromogenic colour papers to protect the dyes and couplers from harmful UV light. TINUVIN 171 can be combined with another liquid UV absorber, TINUVIN 109, to achieve desired absorption characteristics. One of the remarkable benefits of the liquid form of TINUVIN 171 is avoidance of crystallisation of the UV absorber in the liquid photographic emulsion preparation during storage and after coating. Consequently, it allows formulation of thinner layers or layers with increased UV light protecting properties through higher load of UV absorbers. The product can also be used in repro and other photographic applications in which a UV filter is needed e.g. in non-silver imaging colour hard-copy. The amount of TINUVIN 171 required for optimum performance should be determined in trials covering a concentration range. Liquid UV light absorber of the hydroxyphenylbenzotriazole class. Its absorption spectrum does not tail significantly into the visible region so it is an ideal UV absorber for those systems where initial yellowing must be kept to a minimum. Can be combined with another liquid UV absorber,to achieve desired absorption characteristics. It allows formulation of thinner layers or layers with increased UV light protecting properties through higher load of UV absorbers.