Compositions – Light transmission modifying compositions – Displaying color change
Patent
1988-12-21
1991-01-22
Lovering, Richard D.
Compositions
Light transmission modifying compositions
Displaying color change
351163, 544 70, 544 71, 350354, 252582, G02B 523, C07D49820
Patent
active
049869345
ABSTRACT:
Described are spirobenzoxazine pyrrolo pyridine compounds. Also described is the use of such compounds as photochromic substances in organic host materials such as an organic transparent plastic material, e.g., an ophthalmic lens, to impart a photochromic response thereto.
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Knowles David B.
Kwiatkowski Patricia L.
Lovering Richard D.
Metzmaier Daniel S.
PPG Industries Inc.
Stein Irwin M.
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