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US 4,637,698 AGranted
Photochromic compound and articles containing the same
AssigneePPG Industries, Inc.
InventorsWon S. Kwak, Rodney J. Hurditch
Life of this patent
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AssigneePPG Industries, Inc.
InventorsWon S. Kwak, Rodney J. Hurditch
Estimating the term…
Photochromic compounds represented by the graphic formula: ##STR1## wherein: (a) R.sub.1 is selected from the group consisting of C.sub.1 -C.sub.8 alkyl, phenyl, phen(C.sub.1 -C.sub.4) alkyl, allyl and mono- and di-substituted phenyl, said substituents being selected from C.sub.1 -C.sub.4 alkyl and C.sub.1 -C.sub.5 alkoxy; (b) R.sub.2 and R.sub.3 are each selected from the group consisting of C.sub.1 -C.sub.5 alkyl, phenyl, C.sub.1 -C.sub.4 alkyl and C.sub.1 -C.sub.5 alkoxy mono- and disubstituted phenyl, benzyl or combined to form a cyclic ring selected from the group consisting of an alicyclic ring containing from 6 to 8 carbon atoms (including the spiro carbon atom), norbornyl and adamantyl, and (c) R.sub.4 and R.sub.5 are each selected from the group consisting of hydrogen, C.sub.1 -C.sub.5 alkyl, halogen, C.sub.1 -C.sub.5 alkoxy, nitro, cyano and C.sub.1 -C.sub.8 alkoxycarbonyl are described. Solvent systems which form photochromic compositions with the above compounds and articles containing the photochromic compound are described. The compound or compositions typically change from a colorless (nonexcited) or pale color, e.g., yellow, to blue after exposure to ultraviolet light.
A photochromic compound represented by the following graphic formula:
The compound 1,3,5,6-tetramethyl-3-ethylspiro [indoline-2,3'[3H] pyrido[3,2-f] [1,4] benzoxazine].
The compound 1,3,3,5,6-pentamethylspiro [indoline-2,3'[3H] pyrido[3,2-f][1,4] benzoxazine].
The compound 1,3,4,5-tetramethyl-3-ethylspiro [indoline-2,3'[3H] pyrido [3,2-f][1,4]benzoxazine].
The compound 1,3,3,4,5-pentamethylspiro[indoline-2,3'[3H] pyrido[3,2-f][1,4]benzoxazine].
A photochromic article comprising a solid transparent polymerized organic host material containing a photochromic amount of a photochromic compound represented by the graphic formula:
A photochromic article comprising a solid transparent polymerized organic host material selected from the group consisting of polycarbonate, polymers of polyol (allyl carbonate), copolymers of polyol(allyl carbonate) and vinyl acetate, polymethylmethacrylate, cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate butyrate, polystryrene, poly(styrene-methylmethacrylate)copolymer, and poly(styrene-acrylonitrile)copolymer, containing a photochromic amount of a photochromic compound represented by the graphic formula:
An optical photochromic element comprising a host material selected from homopolymers of a polyol(allyl carbonate) and copolymers of polyol(allyl carbonate) and vinyl acetate and a photochromic amount of a photochromic compound represented by the graphic formula:
Dependencies are inferred from the claim text.