G. Rytz et al., INTRODUCTION TO A NEW CLASS OF HIGH-PERFORMANCE LIGHT STABILIZERS ANDTHE INFLUENCE OF LIGHT STABILIZERS STRUCTURE ON THE POLYMERS LIFE TIME, Die Angewandte makromolekulare Chemie, 247, 1997, pp. 213-224
The mode of action of two classes of UV absorbers (2-(hydroxyphenyl)be
nzotriazoles and 2(2'-hydroxyphenyl)- 1,3,5-triazines) is discussed. T
heoretical explanations for the superior light stability of the latter
are given and confirmed by measured half life times in polycarbonate
and solution. A mathematical model for the quantitative prediction of
light protection factors is proposed.