UV Absorber

Benzotriazole based UV absorbers are the world’s largest UV absorber family counting by both value and tonnages. These UV absorbers have high absorption extinct coefficients, as well as broad absorption spectra, edges toward 400 nm, making them the first option recommended for the protection of weathering in plastics and coatings.
The elimination of the excitation energy in the form of harmless heat was thought to proceed via proton transfer between mesomeric (ground state) and tautomeric forms(excited state)of 2-hydroxyphenyl benzotriazoles.
A feature specific to benzotriazole is that no triplet state is involved during the recession of to ground state. This explains its high efficiency and good light-fastness properties a UV absorber. The UV spectrum can be tuned by changing the substituent on the molecule, e.g. a chloro moiety red-shifted the absorption for 10-15 nm. The physical state can also be altered.

Common UV absorbers include linsorb P, 234, 326, 329, 360, 531 as uv absorber for plastic, and 1130, 384-2, 400 as uv absorber for coatings.

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