Stabilization of photochromic systems

Details Stabilization of photochromic systems Stabilization of photochromic systems

C - Chemistry, Metallurgy

08

K

C08K 5/3492 (2006.01) C08K 5/00 (2006.01) C09K 9/02 (2006.01) G02C 7/10 (2006.01)

Patent

CA 2538031

Photochromic compositions are disclosed comprising a polymeric material, a photochromic dye, a hydroxyphenyl triazine UV absorber and, optionally, a further light stabilizer selected from the sterically hindered amines. These systems provide a reversible photochromic effect and show improved light stabilization and color fastness.

L'invention concerne des compositions photochromes comprenant un matériau polymère, un photochrome, un absorbeur UV hydroxyphényl-triazine et, éventuellement, un autre stabilisateur de lumière sélectionné à partir d'amines à encombrement stérique. Ces systèmes permettent d'obtenir un effet photochrome réversible et présentent une stabilisation à la lumière et une solidité de couleur améliorées.

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