Importance

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Abstract

A polymerizable composition comprising an effective amount of at least one tetrafunctional acrylate monomer. In one embodiment of the invention, a polymerizable composition is a compound comprising of at least 50 percent by weight of at least one tetrafunctional acrylate monomer, from 5 to 20 percent by weight of at least one modified bisphenol A epoxy diacrylate monomer, from 0 to 25 percent by weight of at least one acrylate monomer selected from aliphatic difunctional and polyfunctional acrylates, from 0 to 3 percent by weight of at least one UV absorber, and a source of free radicals. The lens-forming material resulted from the polymerizable composition is introduced to a lens mold with a mold cavity having a configuration conforming to the optical lens to be molded. A radiation energy source is used to cure the lens-forming material in the filled mold. The radiation energy source comprises a U-shaped UV light. The U-shaped UV light has a first arm capable of delivering UV light in a first direction and a second arm capable of delivering UV light in an opposite second direction. The first and second arms are spaced apart and substantially parallel to each other, thereby defining a space therebetween. The filled mold is placed at the center of the space therebetween the first and second arms to receive the radiations from the first and second directions for curing. The resultant lens has an inherently integrated 'hard-soft-hard' structure cross-sectionally.

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First Claim