Mold materials for silicone containing lens materials
AssigneeBausch & Lomb Incorporated
InventorYu-Chin Lai
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Abstract
When molding shaped articles such as contact lenses from monomeric mixtures containing silicone monomers and hydrophilic monomers, the wettability of the resulting article is improved by using a mold material produced from a resin comprising a copolymer of an alpha, beta, olefinically unsaturated mononitrile and at least one comonomer to enhance melt processability.
Claims19
An improved shaped article prepared by copolymerizing at least one silicone-containing monomer and at least one hydrophilic monomer in a mold, the improvement wherein said mold is produced from a resin comprising a copolymer that improves surface wettability of the article polymerized in said mold and which is a copolymer of an alpha, beta olefinically unsaturated mononitrile and at least one comonomer that enhances melt processability of said resin.
In a silicone-containing contact lens prepared by copolymerizing at least one hydrophobic silicon-containing monomer and at least one hydrophilic monomer in a mold, the improvement wherein a surface of the contact lens is formed from a molding surface of the mold and the mold is provided from a resin comprising a copolymer that improves surface wettability of the contact lens polymerized in said mold and which is a copolymer of an alpha, beta olefinically unsaturated mononitrile and at least one comonomer that enhances melt processability of said resin.
Dependencies are inferred from the claim text.