HIGH ADHESION ACRYLATE COATINGS FOR A PHOTOCHROMIC OPHTHALMIC LENS
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United States of America Patent
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app pub date -
Mar 25, 2010
filing date -
Jun 20, 2007
priority date (Note) -
Abandoned
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Abstract
A method used to prepare a photochromically-enabled bifocal ophthalmic lens. A lens substrate is injection molded and then a coating is applied to the substrate to form a bifocal surface. The coating is a high adhesive strength acrylate-based coating that contains a small quantity of a polycarbonate-based TPU. The thermoset coating produces an intermediate imbibable bifocal surface. A photochromic solution is subsequently imbibed by contact with the bifocal surface. The TPU acts as an adhesion enhancer so that the coating to substrate integrity is maintained following the imbibing step.
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