Photochromic annelated naphthopyrane systems with special substituents, for attaining rapid lightening speeds

PH12020552133B1Active Publication Date: 2026-08-12RODENSTOCK GMBH

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Patent Information

Application Number: PH12020552133
Authority / Receiving Office: PH · PH
Patent Type: Patents
Current Assignee / Owner
Filing Date: 2020-12-10
Publication Date: 2026-08-12
Estimated Expiration: 2040-12-10

Application Information

Patent Timeline

10 Dec 2020

Application

PH12020552133

12 Aug 2026

Publication

PH12020552133B1

Inventors: WEIGAND, Udo; ZINNER, Herbert

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Abstract

The present invention relates to new photochromic, fused naphthopyran systems having specific substituents R1, which can be used to attain very rapid lightening speeds, without detriment to the depth of darkening after excitation, and also to the use thereof in plastics of all kinds.

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