Photochromic compounds

Details Photochromic compounds Photochromic compounds

2007-10-26

2009-08-25

Saeed, Kamal A (Department: 1626)

Drug, bio-affecting and body treating compositions

Inorganic active ingredient containing

Elemental sulfur or compound thereof

C544S106000, C252S586000

Reexamination Certificate

active

07579022

ABSTRACT:
Various non-limiting embodiments disclosed herein relate generally to photochromic compounds, which may be thermally reversible or non-thermally reversible, and articles made therefrom. Other non-limiting embodiments relate to photochromic-dichroic compounds, which may be thermally reversible or non-thermally reversible, and articles made therefrom. For example, one non-limiting embodiment provides a thermally reversible, photochromic compound adapted to have at least a first state and a second state, wherein the thermally reversible, photochromic compound has an average absorption ratio greater than 2.3 in at least one state as determined according to CELL METHOD. Another non-limiting embodiment provides a photochromic compound comprising: (a) at least one photochromic group chosen from a pyran, an oxazine, and a fulgide; and (b) at least one lengthening agent L attached to the at least one photochromic group and represented by the formula —[S1]c—[Q1—[S2]d]d′—[Q2—[S3]e]e′—[Q3—[S4]f]f′—S5—P, which is described herein.

REFERENCES:
patent: 7247262 (2007-07-01), Evans et al.

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