UV-curing-compatible photochromic fused naphthopyrans

US10077274B2 · kind B2 · utility

Assignee

• RODENSTOCK GMBH · DE

Inventors

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

Key dates

• Filing date: Jun 12, 2014
• Grant date: Sep 18, 2018
• Expiry date: Mar 21, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/102
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The present invention relates to UV-curing-compatible photochromic single- or double-fused naphthopyrans of the general formulae (I) or (II) and the use thereof in plastics of all kinds, particularly for ophthalmic purposes. The photochromic compounds according to the invention are characterized by their excellent UV-curing compatibility, i.e. they remain undamaged—incorporated, for example, in an acrylate monomer matrix with UV initiator—by a free-radical polymerization of the matrix initiated by strong UV light. The photochromic dyes according to the invention, by means of suitable choice of substituents, are in addition characterized by two distinct absorption bands of the open form in the visible wavelength range, i.e. two conventional photochromic dyes, each having one discrete absorption band, can be replaced with a molecule of this type.