C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 9/02 (2006.01) C08G 18/32 (2006.01) C08G 18/66 (2006.01) C09D 5/00 (2006.01) C09D 7/12 (2006.01) C09D 175/04 (2006.01) G02B 5/23 (2006.01)
Patent
CA 2257543
A stabilizing matrix for photochromic compounds is disclosed in which a functionalized hindered amine light stabilizer capable of reacting with an isocyanate group is linked to the polymer backbone by a convalent bond to form a grafted structure. The resultingg matrix is characterized by having a stabilizing effect on the photochromic dye, in particular, spirooxazines. Preferred specific articles of the invention are photochromic organic lenses.
On décrit une matrice stabilisante, destinée à des composés photochromes et dans laquelle un stabilisant de la lumière à base d'amine encombrée et fonctionnalisée, peut réagir avec un groupe isocyanate et est lié au squelette d'un polymère par une liaison covalente afin de former une structure greffée. La matrice résultante est caractérisée en ce qu'elle possède un effet stabilisant sur le colorant photochrome, notamment les spiro-oxazines. Les verres organiques photochromiques constituent des articles spécifiques préférés de l'invention.
Corning Incorporated
Gowling Lafleur Henderson Llp
Henry David
LandOfFree
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