Novel photochromic organic materials

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 220/30 (2006.01) C08F 222/10 (2006.01) G02B 1/04 (2006.01) G02B 5/23 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2220149

The invention relates to photochromic transparent organic materials presenting an index of refraction of more than 1.55, which are free of optical distortions and are prepared by radical polymerization of a polymerizable composition comprising: a) 80-95 wt. % of at least one monomer represented by general formula (I), where R = H or CH3, and m and n are independently 1 or 2; b) 5-20 wt.% of at least one aromatic monovinyl monomer represented by general formula (II) where R1 = H or CH3; c) an effective quantity of at least one dye that imparts photochromic properties to the material, selected from the groups of spiroxazines, spiropyrans and chromenes; d) an effective quantity of a chain transfer agent; and e) an effective quantity of a radical polymerization initiator, characterized in that the chain transfer agent is a linear alkanethiol and the radical polymerization initiator is a diazo compound.

L'invention porte sur des matériaux organiques photochromes transparents présentant un indice de réfraction supérieur à 1,55 et exempts de distorsions optiques préparés par polymérisation radicalaire d'une composition polymérisable comportant: (a) de 80 à 95 % d'au moins un monomère de formule générale (I) où R = H ou CH¿3?, et m et n sont indépendamment 1 ou 2; (b) de 5 à 20 % en poids un monovinyle aromatique de formule générale (II) où R¿1? = H ou CH¿3?; (c) une quantité efficace d'au moins un colorant conférant des propriétés photochromes au matériau et sélectionné parmi les groupes des spiroxazines, spiropyrans et chromènes; (d) une quantité efficace d'un agent de transfert de chaîne; et (e) une quantité efficace d'un initiateur de polymérisation radiculaire; et caractérisé en ce que l'agent de transfert de chaîne est un alcanethiol linéaire, et l'initiateur de polymérisation, un composé diazo.

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