American Optical Corporation

Peter G Piusz

Nori Y Chu

Richard J Hovey

Charles H Fuchsman

Photochromic compounds of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen and R.sub.5 is an alkyl of 2 to 10 carbons, and their use in lenses are disclosed.

Photochromic compounds

Photochromic compounds of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, and R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen and their use in lenses are disclosed.

Light fatigue resistant, non-orange, photochromic mercury complexes of asymmetrical diarylthiocarbazones for use in making photochromic sunglass lenses, ski goggles, and the like. The compounds comprise the class of mono and bis mercury diarylthiocarbazonates wherein one aryl group is an aryl group substituted at the ortho position with an electron withdrawing group such as CF.sub.3 and the other aryl group is different from the first and can comprise variously substituted or unsubstituted phenyl or naphthyl groups.

Photochromic mercury complexes of asymmetrical diarylthiocarbazones

Photochromic plastic materials are disclosed which comprise a polymeric matrix containing a multiplicity of activated silver halide particles less than 1000 Angstroms in size. The matrix may contain a retained amount of plasticizer which optimizes the desirable photochromic properties and may be sealed to prevent loss of plasticizer. The materials are made by forming activated silver halide particles in the presence of a film forming polymer dissolved in a plasticizer and removing the plasticizer to produce a supple, shape-retaining element.

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Longmeadow, MA, United States of America

Peter G Piusz