Photochromic article

Claim 1

A photochromic article comprising a polymerized organic host material and a photochromic amount of a photochromic compound represented by the graphic formula: ##STR9## wherein: (a) R 1 is selected from the group consisting of C 1 -C 8 alkyl, phenyl, phen(C 1 -C 4 )alkyl, naphth (C 1 -C 4 ) alkyl, allyl, acrylyl, methacrylyl, C 1 -C 4 acyloxy (C 2 -C 6 )alkyl, carboxy(C 2 -C 6 )alkyl, cyano(C 2 -C 6 )alkyl, hydroxy(C 2 -C 6 )alkyl, (C 2 H 4 O) m ·CH 3 , and mono- and di-substituted phenyl, said phenyl substituents being selected from C 1 -C 4 alkyl and C 1 -C 5 alkoxy, and m is a number from 1 to 6; (b) R 2 and R 3 are each selected from the group consisting of C 1 -C 5 alkyl, phenyl, and mono- and di-substituted phenyl, benzyl or combine 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, said phenyl substituents being selected from C 1 -C 4 alkyl and C 1 -C 5 alkoxy; (c) each R 4 is selected from the group consisting of C 1 -C 5 alkyl, halogen, C 1 -C 5 alkoxy, nitro, cyano, C 1 -C 4 monohaloalkyl, C 1 -C 4 polyhaloalkyl, C 1 -C 8 alkoxycarbonyl, and C 1 -C 4 acyloxy; (d) each R 5 is selected from the group consisting of halogen, C 1 -C 4 alkyl, C 1 -C 5 alkoxy, nitro, cyano, thiocyano, C 1 -C 4 monohaloalkyl, and C 1 -C 2 polyhaloalkyl; and (e) the letters "c" and "e" are numbers of from 0 to 4 and 1 to 4 respectively, said organic host material being selected from the group consisting of polymers of polyol(allyl carbonate), polyacrylates, poly(alkylacrylates), cellulose acetate, cellulose triacetate, cellulose acetate propionate, cellulose acetate butyrate, poly(vinyl acetate), poly(vinyl alcohol), poly(vinyl chloride), poly(vinylidene chloride), polyurethane, polycarbonate, poly(ethylene terephthalate), polystyrene, poly(styrene-methylmethacrylate)copolymers, poly(styrene-acrylonitrile) copolymers, and poly(vinyl butyral).