Photochromic 3H-naphthopyrans

Details Photochromic 3H-naphthopyrans Photochromic 3H-naphthopyrans

1996-12-20

1998-01-13

Tucker, Philip

Compositions

Light transmission modifying compositions

Displaying color change

549389, 549 43, 549 58, 546196, 548454, 548464, 548525, G02B 523, C07D31192

Patent

active

057075573

ABSTRACT:
Photochromic compounds with a 3H-naphthopyran structure having at least one pyrene moiety in the 3-position, a method for preparing such compounds, and the use of such compounds for producing photochromic articles from an organic synthetic material.

REFERENCES:
patent: 3567605 (1971-03-01), Becker
patent: 4931221 (1990-06-01), Heller
patent: 4980089 (1990-12-01), Heller
patent: 5066818 (1991-11-01), Gemert et al.
patent: 5238981 (1993-08-01), Knowles
patent: 5274132 (1993-12-01), Van Gemert
patent: 5340857 (1994-08-01), Van Gemert
patent: 5369158 (1994-11-01), Knowles
patent: 5395567 (1995-03-01), Van Gemert et al.
patent: 5552090 (1996-09-01), Van Gemert et al.
patent: 5552091 (1996-09-01), Kumar

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