| 摘要 |
<p>v-Triazoles of the formula where X and Y are hydrogen or monovalent substituents or together form the residue of a non-aromatic ring condensed with the v-triazole ring, and Z is an o-hydroxyphenyl or o-hydroxynaphthyl group, which may be further substituted. To protect light-sensitive materials, particularly polymers, against ultraviolet light. Less colour and better compatibility than known triazole stabilisers. The properties of the triazoles can be altered at will by changes in the substituents in the 4 and/or 5 positions. A very wide range of substituents can be carried by the v-triazoles.</p> |
