| 摘要 |
<p>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.</p> |
