Method for obtaining a photochromic latex

C - Chemistry – Metallurgy – 08 – F

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C08F 2/44 (2006.01)

Patent

CA 2397673

The invention concerns a method comprising: (1) preparing a mixture containing at least an organic monomer Z with C=C group, polymerisable by free radical polymerisation, at least an organic photochromic compound, at least a surfactant, water and optionally a polymerisation initiator; (2) treating the mixture obtained at step (1) to form a mini-emulsion comprising an organic phase dispersed in the form of droplets having a diameter ranging between 50 and 500 nm, preferably between 50 and 300 nm, in the aqueous phase; (3) adding to the mini-emulsion a polymerisation initiator, if the latter has not been introduced in step (1), or an additional amount of initiator with respect to step (1); (4) polymerising the reaction mixture obtained at step (3); and (5) recuperating the photochromic latex. The invention is useful for producing photochromic films.

Procédé d'obtention d'un latex photochromique comprenant: (1) la préparation d'un mélange comprenant au moins un monomère organique Z à groupement C=C, polymérisable par voie radicalaire, au moins un composé photochromique organique, au moins un agent tensio-actif, de l'eau et éventuellement un amorceur de polymérisation; (2) le traitement du mélange obtenu à l'étape (1) pour former une miniémulsion comprenant une phase organique dispersée sous forme de gouttelettes ayant un diamètre de 50 à 500 nm, de préférence 50 à 300 nm, dans une phase aqueuse; (3) l'addition à la miniémulsion d'un amorceur de polymérisation, si celui-ci n'a pas été introduit lors de l'étape (1), ou d'une quantité supplémentaire d'amorceur par rapport à l'étape (1); (4) la polymérisation du mélange réactionnel obtenu à l'étape (3), et (5) la récupération du latex photochromique. La formation de films photochromiques est également décrite.

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