Performance and Mechanisms of Hindered Amine Light Stabilizer in Spirooxazine Photostabilization

C. Salemi-Delvaux Laboratoire de Chimie et Matériaux Organiques, Modélisation - Universié. de la Mé diterannée, Faculté des Sciences de Luminy, Case 901 -163, avenue de Luminy, 13288, Marseille Cedex, 9, FRANCE Phone: 91-26-93-42 Fax: 91-26-93-42

M. Campredon Laboratoire de Chimie et Matériaux Organiques, Modélisation - Universié. de la Mé diterannée, Faculté des Sciences de Luminy, Case 901 -163, avenue de Luminy, 13288, Marseille Cedex, 9, FRANCE Phone: 91-26-93-42 Fax: 91-26-93-42

G. Giusti Laboratoire de Chimie et Matériaux Organiques, Modélisation - Universié. de la Mé diterannée, Faculté des Sciences de Luminy, Case 901 -163, avenue de Luminy, 13288, Marseille Cedex, 9, FRANCE Phone: 91-26-93-42 Fax: 91-26-93-42

R. Guglielme'iti Laboratoire de Chimie et Matériaux Organiques, Modélisation - Universié. de la Mé diterannée, Faculté des Sciences de Luminy, Case 901 -163, avenue de Luminy, 13288, Marseille Cedex, 9, FRANCE Phone: 91-26-93-42 Fax: 91-26-93-42

Abstract

One of the key requirements for optical switching apertures for ophtalmic, building and automobile glazing is long lived product. However, oxidation of a spirooxazine yields photoproducts such as oxindoie derivatives, naphthoxazole, dihydro-2,6-quinolone and 1-N-formylimino-2-naphthoquinone devoid of photochromic activity, and limits the commercialisation of these useful systems. Achieving this long lived product can be provide by use of hindered amine light stabilizers (HALS). This paper describs the comportment of a spirooxazine irradiated in the presence of a HALS and the main stabilization mechanisms are discussed.

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Performance and Mechanisms of Hindered Amine Light Stabilizer in Spirooxazine Photostabilization

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Performance and Mechanisms of Hindered Amine Light Stabilizer in Spirooxazine Photostabilization

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