Photochromic compounds and their use in photoreactive lenses
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United States of America Patent
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Mar 18, 1986
Grant Date -
N/A
app pub date -
Sep 7, 1983
filing date -
Sep 7, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is disclosed for manufacturing transparent plastic articles, primarily plano or opthalmic photoreactive lenses, which comprises incorporating fulgides or fulgimides containing an adamantylidene group in plastics casting or moulding compositions or preformed plastics articles and converting the fulgide or fulgimide in situ into a form in which it confers on the article the property of darkening in the presence of sunlight and fading in its absence.
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