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| Photochromic polymer |
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ExpertSun is a new family of photohromic polymers developed from new polymerizable naphtopyrane derivatives. These polymeric materials have the ability to rapidly and reversibly change their colour with and without light.
Naphtopyranes are a good compromise between intensity of the colour and discoloration rate. Moreover, their structural change in the excited form is not perturbed by the surrounding polymer matrix and they present a good fatigue resistance.
The photochromic phenomenon is a result of the ring-opining which occurs in the excited state, leading to the formation of double bonds. |
PolymerExpert has developed an innovative route to synthesize ExpertSun monomers, which results in a product which can be copolymerized with the host matrix. As a result, ExpertSun possesses zero mobility in the host matrix and is biocompatible.
Patent references : FR2840907, WO03106536, EP1521795, US20040010929, JP200413361, CA2489828, AU2003258799
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