Transitions Optical, Inc.

Ppg Industries Ohio, Inc.

Patrick M Brown

Anu Chopra

Barry Van Gemert

Kevin J Stewart

Carol L Knox

Feng Wang

Various photochromic materials are provided that are essentially free of polymerizable unsaturated groups, and comprise: Alternative embodiments include various substituents at other positions of the indeno[2',3&#x2032;:3,4]naphtho[1,2-b]pyran.

Photochromic materials demonstrating improved fade rates

Various photochromic materials are provided that are essentially free of polymerizable unsaturated groups, and comprise: Alternative embodiments include various substituents at other positions of the indeno[2',3&#x2032;:3,4]naphtho[1,2-b]pyran. Also provided are photochromic articles including a substrate and one of the above photochromic materials, in contact with at least a portion of the substrate.

Various non-limiting embodiments disclosed herein related to photochromic materials comprising the reaction product of (a) at least one ring-opening cyclic monomer, and (b) a photochromic initiator. Other non-limiting embodiments related to photochromic materials represented by: wherein S' comprises the at least one ring-opened cyclic monomer as set forth herein. Other non-limiting embodiments related to photochromic compositions, optical elements, and methods of inhibiting migration of a photochromic material in a polymeric material using the photochromic materials disclosed herein. Methods of making such photochromic materials, compositions, and optical elements are also disclosed.

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Moon Township, PA, United States of America

Patrick M Brown