Method for preparing a photochromic polyurethane latex and...

Compositions – Light transmission modifying compositions – Displaying color change

Reexamination Certificate

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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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patent: 5541251 (1996-07-01), Bontinck et al.
patent: 5603757 (1997-02-01), Mizuguchi et al.
patent: 5688356 (1997-11-01), Sagiv
patent: 6031041 (2000-02-01), Chung et al.
patent: 6077648 (2000-06-01), Nair et al.
patent: 6083427 (2000-07-01), Henry
patent: 09296106 (1997-11-01), None
patent: 10-025471 (1998-01-01), None
patent: WO 98/37115 (1998-08-01), None

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