C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 9/02 (2006.01) G02B 5/23 (2006.01)
Patent
CA 2631935
Photochromic materials comprising indeno-fused naphthopyrans having a first electron-withdrawing substituent and, in certain non-limiting embodiments, a second electron-withdrawing substituent are disclosed. The photochromic materials according to the various embodiments may display faster fade rates, bathochromic shift, and higher performance ratings compared to comparable indeno-fused naphthopyrans without the electron-withdrawing substituents. Photochromic compositions and articles, such as optical elements, incorporating the photochromic materials are also disclosed.
La présente invention concerne des matériaux photochromes comprenant des naphtopyrannes indéno-fusionnés comportant un premier substituant de retrait d'électrons et, dans certains modes de réalisation non limitatifs, un second substituant de retrait d'électrons. Les matériaux photochromes selon les divers modes de réalisation peuvent présenter des taux de décoloration plus rapides, un décalage bathochrome, et des caractéristiques d'efficacité supérieures par rapport à des naphtopyrannes indéno-fusionnés ne comprenant pas de substituants de retrait d'électrons. L'invention concerne également des compositions et articles photochromes, tels que des éléments optiques, incorporant les matériaux photochromes.
Chopra Anu
Kim Beon-Kyu
Van Gemert Barry
Borden Ladner Gervais Llp
Transitions Optical Inc.
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