Importance

Loading Importance Indicators...

Abstract

An optical lens comprising a polyvinylalcohol film layer that is covalently bonded to a bulk polymerizable material during formation of the polymeric lens. The bulk optical lens polymer is preferably a glycol bis(allylcarbonate). Covalent bonding between these materials is achieved via an adhesive mixture that contains (a) a polyurethane to bond with the polyvinylalcohol layer, and (b) a polymethacrylate terpolymer with (i) pendant hydroxy groups that bind to the urethane, and (ii) pendant allyl groups that covalently bond to the bulk polymer. This strong covalent bonding reduces the chance of delamination of the lens during surfacing, polishing, and edging, and preserves its integrity during the lifetime of the finished eyewear.

Loading the Abstract Image...

First Claim