Patent · US Active

Photochromic bis-idenofused naphthopryans

US8987477B2 · kind B2 · utility

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1References

8Claims

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Assignee

RODENSTOCK GMBH · DE

Inventors

Udo Weigand · Munich, DE
Herbert Zinner · Pentling, DE
Yven Rohlfing · Munich, DE

Key dates

Filing date	Dec 7, 2012
Grant date	Mar 24, 2015
Priority date	—
Expiry date	Dec 7, 2032

Classification

Technology area (CPC G)Physics
CPC primaryG02B5/23
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to photochromic double-indeno-fused naphthopyrans of the general formula (I) and the use thereof in plastics of all kinds, particularly for ophthalmic purposes. The photochromic compounds according to the invention are characterized by two distinct absorption bands of the open form in the visible wavelength range, i.e. two conventional photochromic dyes, each having only one discrete absorption band, can be replaced with dye molecules of this type. The compounds according to the invention, moreover, have a very good lifetime with a very high performance.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.