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

US6967249B2 · kind B2 · utility

Assignee

• RODENSTOCK GMBH · DE

Inventors

• Claudia Mann · Munich, DE
• Manfred Melzig · Weßling, DE
• Udo Weigand · Munich, DE

Key dates

• Filing date: Jul 2, 2004
• Grant date: Nov 22, 2005
• Expiry date: Aug 30, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C1/73
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

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.