Patent
Hydroxylated/carboxylated naphthopyrans
TLDR
In this article, photochromic hydroxylated/carboxylated naphthopyran compounds are described, examples of which are certain 2H-naphtho[1,2-b]pyrans, 3H-Naphthohopyrans and indeno[2,1-f]naphthsopyrants each having at least one hydroxynylated or carboxylated substituent.Abstract:
Described are novel photochromic hydroxylated/carboxylated naphthopyran compounds, examples of which are certain 2H-naphtho[1,2-b]pyrans, 3H-naphtho[2,1-b]pyrans and indeno[2,1-f]naphtho[1,2-b]pyrans each having at least one hydroxylated/carboxylated substituent. Specific substituents are also present on the naphtho, indeno and/or pyrano portions of the compounds. These compounds may be represented by the graphic formulae (I), (II) and (III). Also described are various substrates, e.g., paper, glass, polymeric organic materials, etc., that contain or that are coated with such compounds. Optically clear articles such as contact lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., certain other naphthopyrans, indenonaphthopyrans, benzopyrans, oxazine-type compounds, etc., are also described.read more
Citations
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Journal ArticleDOI
The generic enhancement of photochromic dye switching speeds in a rigid polymer matrix
Richard A. Evans,Richard A. Evans,Tracey Hanley,Tracey Hanley,Melissa A. Skidmore,Melissa A. Skidmore,Thomas P. Davis,Thomas P. Davis,Georgina K. Such,Georgina K. Such,Georgina K. Such,Lachlan H Yee,Lachlan H Yee,Graham E. Ball,David A. Lewis +14 more
TL;DR: The attachment of flexible oligomers having a low glass-transition temperature—such as poly(dimethylsiloxane)—to photochromic dyes greatly increases their switching speeds in a rigid polymer matrix and provides greater molecular mobility for the switching process.
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References
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Patent
Photochromic indeno-fused naphthopyrans
TL;DR: In this article, photochromic indeno-fused naphthopyran compounds are described, examples of which are NPHO compounds having a substituted or unsubstituted indeno group.
Patent
Polymerizable polyalkoxylated naphthopyrans
TL;DR: In this article, photochromic polymerizable polyalkoxylated naphthopyran compounds are described, examples of which are certain 2H-naphtho[1,2-b]pyrans, 3H-Naphthoe[2,1-b]-pyrants, and indeno[2.1-f]naphthsopyrans.
Patent
Process for the manufacture of a crosslinked, transparent, hydrophilic and photochromic polymeric material, and optical and ophthalmic article obtained
TL;DR: In this article, a process for the manufacture of crosslinked, transparent, hydrophilic and photochromic polymeric materials and the use of the latter in the manufacturing of optical and ophthalmic articles having photo-chromic properties and in particular contact lenses is described.