Patent
Photochromic substituted naphthopyran compounds
Barry Van Gemert,Anil Kumar +1 more
Reads0
Chats0
TLDR
In this article, reversible photochromic naphthopyran compounds are described, examples of which are 3H-naphtho[2,1-b]pyrans having an acyl or aroyl oxy-bearing substituent at the number 6 carbon atom and certain substituents at the 3 position of the pyran ring.Abstract:
Described are novel reversible photochromic naphthopyran compounds, examples of which are 3H-naphtho[2,1-b]pyrans having an acyl or aroyl oxy-bearing substituent at the number 6 carbon atom and certain substituents at the 3-position of the pyran ring. Certain substituents may also be present at the number 5, 7, 8, 9 or 10 carbon atom of the naphthopyran. These compounds may be represented by graphic formula (I). Also described are polymeric organic host materials that contain or that are coated with such compounds. Optically clear articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., certain other naphthopyrans, benzopyrans, and spiro(indoline) type compounds, are also described.read more
Citations
More filters
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
Polyurethanes, articles and coatings prepared therefrom and methods of making the same
TL;DR: In this article, an isocyanate functional urethane prepolymer comprising a reaction product of components including: (i) about 1 equivalent of at least one polyisocyanates; and (ii) about 0.1 to about 0.5 equivalents of at most branched polyol having 2 to 18 carbon atoms.
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
Plastic lens systems, compositions and methods
TL;DR: An apparatus for preparing a plastic eyeglass lens includes a coating unit and a lens curing unit as discussed by the authors, which is preferably configured to allow the operation of both the coating and the lens curing units.
Patent
Indeno-fused photochromic naphthopyrans
TL;DR: In this article, photochromic indeno-fused naphthopyran compounds have been described, which have a rating of at least 80 in the Relative ΔOD at Saturation Test and may be represented by the following graphic formula:
References
More filters
Patent
Photochromic naphthopyran compounds
TL;DR: In this article, reversible photochromic naphthopyran compounds are described, examples of which are compounds substituted at the 3 position of the pyran ring with (i) an aryl substituent and (ii) a phenyl substitution having a 5- or 6-member heterocyclic ring fused at the number 3 and 4 carbon atoms of the phenyl substituents.
Patent
Photochromic compound and articles containing the same
Won S. Kwak,Rodney J. Hurditch +1 more
TL;DR: In this article, the use of photochromic substances in organic host materials such as an organic transparent plastic material, e.g., an ophthalmic lens, to impart a photo-chromic response was described.
Patent
Photochromic spiropyran compounds
TL;DR: A series of photochromic spiropyrans are disclosed in this paper, in which a spiro-adamantane group is introduced into the 2-position of the benzopyran or naphthopyrans ring.
Patent
Photochromic composition resistant to fatigue
TL;DR: The organic photochromic composition of this invention comprises spiro [indoline-2,3'-[3H]-naphth [2,1-b] [1,4] oxazine] (SO) dye and an unconventional ultraviolet stabilizer as mentioned in this paper.