Photochromic 3H-naphtho[2,1-b]-pyran compounds and photochromic articles produced therewith

Photochromic 3H-naphtho[2,1-b]-pyran compounds and photochromic articles produced therewith

Specific photochromic 3H-naphtho[2,1-b]-pyran compounds useful with various types of synthetic resin materials to form photochromic articles, especially ophthalmic lenses, and photochromic articles formed with such compounds. The compounds of the invention have especially long-wave absorption maxima...

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Hauptverfasser: Mann, Claudia, Melzig, Manfred, Weigand, Udo
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creator Mann, Claudia
Melzig, Manfred
Weigand, Udo
description Specific photochromic 3H-naphtho[2,1-b]-pyran compounds useful with various types of synthetic resin materials to form photochromic articles, especially ophthalmic lenses, and photochromic articles formed with such compounds. The compounds of the invention have especially long-wave absorption maxima in the open form thereof and enable violet to blue tints to be obtained when used in photochromic articles.
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title Photochromic 3H-naphtho[2,1-b]-pyran compounds and photochromic articles produced therewith
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