PHOTOCHROMIC COMPOSITIONS OF IMPROVED FATIGUE RESISTANCE

摘要

Photochromic optical articles of improved resistance to light fatigue are provid ed by the use of a combination of hindered amine light stabilizer and asymmetric diaryloxalamide light stabilizer with a mi xture of (1) photochromic material having a minima luminous transmission in the range of 560 to 630 nanometers and (2) photo chromic material having a minima luminous transmission in the range of 430 to 520 nanometers.