Patent · US Expired

3-Arylbenzofuranones with electron-withdrawing substituents as stabilizers

US6809208B2 · kind B2 · utility

1Cited by

4References

19Claims

0Family size

Assignee

Ciba Specialty Chemicals Corporation · US

Inventors

Michael Tinkl · Weil am Rhein, DE
Oliver Dosenbach · Bad Bellingen, DE
Peter Nesvadba · Marly, CH
Martin Wolff · Weil am Rhein, DE
Bruno Rotzinger · Birsfelden, CH
Dietmar Mäder · Oberursel, DE

Key dates

Filing date	Aug 12, 2002
Grant date	Oct 26, 2004
Priority date	—
Expiry date	Aug 12, 2022

Classification

Technology area (CPC G)Physics
CPC primaryG03C2200/35
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The invention describes novel compounds of the formula (I) wherein the general symbols are as defined in claim (1) and R1 is an aromatic radical with electron withdrawing substituents, as stabilizers for protecting organic materials, in particular polymers and lubricants, against oxidative, thermal or light-induced degradation and as scavengers for oxidized developer in color photographic material.

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