Benzo-, naphtho- and phenanthrochromene substituted by...

Details Benzo-, naphtho- and phenanthrochromene substituted by... Benzo-, naphtho- and phenanthrochromene substituted by...

2007-07-31

2007-07-31

Dentz, Bernard (Department: 1625)

Compositions

Light transmission modifying compositions

Displaying color change

C549S381000, C549S382000, C549S384000, C549S389000, C549S406000

Reexamination Certificate

active

10867201

ABSTRACT:
Disclosed are novel benzo-, naphtho- and phenanthrochromenes substituted by carbamated or ureated phenyls having the following general formula (I):wherein R1represents a grouptheir preparation, photochromic compositions and articles containing them. This family of compounds have interesting and useful photochromic properties, especially in terms of absorption band and discoloration speed.

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