Abstract: The present invention provides a photochromic material which is an indeno-fused naphthopyran having a pi-conjugation extending group bonded to the 11-position of the indeno-fused naphthopyran, the pi-conjugation extending group having at least one pendent halo-substituted group bonded thereto. The pi-conjugation extending group extends the pi-conjugation system of said indeno-fused naphthopyran. The 13-position of the indeno-fused naphthopyran is substantially free of spiro-substituents. The invention further provides photochromic materials of specified structure, photochromic compositions, photochromic articles and optical elements that include the photochromic material.
Type:
Grant
Filed:
September 1, 2010
Date of Patent:
April 3, 2012
Assignee:
Transitions Optical, Inc
Inventors:
Anu Chopra, Jun Deng, Beon-Kyu Kim, David B. Knowles, Frank Molock, Victor A. Montes, Stephen D. Straight, Wenjing Xiao, Huayun Yu