Compositions – Light transmission modifying compositions – Displaying color change
Reexamination Certificate
2001-07-06
2009-10-27
Kugel, Timothy J (Department: 1796)
Compositions
Light transmission modifying compositions
Displaying color change
C252S182200, C359S004000, C430S339000
Reexamination Certificate
active
07608207
ABSTRACT:
The method of the invention comprises: a) forming a hydrophilic polyurethane prepolymer with isocyanate end groups, by the polyaddition reaction of at least one polyol and at least one diisocyanate in the presence of at least one internal emulsifying agent; b) mixing the polyurethane prepolymer with a photochromic agent; c) adding water or a mixture of water and solvent, under agitation, to the mixture of the polyurethane prepolymer and the photochromic agent, to form an emulsion; and d) adding at least one chain extension agent to the emulsion and performing a chain extension reaction to give the final photochromic polyurethane latex. Application to the production of ophthalmic articles having photochromic properties.
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Cano Jean-Paul
Charleux Bernadette
Maisonnier Sylvette
Tardieu Pascale
Vairon Jean-Pierre
Essilor International "Compagnie Generale d'Optique"
Fulbright & Jaworski L.L.P.
Kugel Timothy J
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