DIRECT COMPRESSION MOLDED OPHTHALMIC DEVICES
A method for making ophthalmic devices includes direct compression molding one or more ophthalmic device forming polymers in a mold to form ophthalmic devices.
1 . A method for making ophthalmic devices comprising direct compression molding one or more ophthalmic device forming polymers in a mold to form an ophthalmic device.
2 . The method of claim 1 , wherein the mold comprises a posterior mold section having a molding surface shaped to provide a posterior ophthalmic device surface and an anterior mold section having a molding surface shaped to provide an anterior ophthalmic device surface.
3 . The method of claim 2 , comprising placing the one or more ophthalmic device forming polymers in the anterior mold section and capping the anterior mold section with the posterior mold section.
4 . The method of claim 3 , further comprising de-capping the anterior mold section from the posterior mold section and releasing the ophthalmic device from either the anterior mold section or the posterior mold section.
5 . The method of claim 1 , wherein the direct compression molding is a continuous direct compression molding.
6 . The method of claim 1 , wherein the one or more ophthalmic device forming polymers comprise one or more of an aliphatic hydrophilic thermoplastic polyurethane, an aromatic hydrophilic thermoplastic polyurethane, an aliphatic hydrophilic thermoplastic polyester, an aromatic hydrophilic thermoplastic polyester, and a blend of one or more of the aliphatic hydrophilic thermoplastic polyurethane, the aromatic hydrophilic thermoplastic polyurethane, the aliphatic hydrophilic thermoplastic polyester, the aromatic hydrophilic thermoplastic polyester with a hydrophobic silicone.
7 . The method of claim 6 , wherein the aliphatic hydrophilic thermoplastic polyurethane comprises a reaction product of an aliphatic organic diisocyanate, a polyether polyol and a chain extender.
8 . The method of claim 1 , wherein the one or more ophthalmic device forming polymers comprise a blend of the one or more ophthalmic device forming polymers and one or more silicone polymers.
9 . The method of claim 8 , wherein the one or more silicone polymers include polydimethylsiloxane, dimethicone or both.
10 . The method of claim 1 , wherein the one or more ophthalmic device forming polymers comprise a blend of the one or more ophthalmic device forming polymers and one or more silicone-urethane copolymers.
11 . The method of claim 1 , wherein the one or more ophthalmic device forming polymers comprise one of a polymer film, a melt pellet and a hot melt.
12 . The method of claim 1 , comprising:
(a) introducing the one or more ophthalmic device forming polymers into an anterior mold section;
(b) capping the anterior mold section with a posterior mold section mold; and
(c) direct compression molding the one or more ophthalmic device forming polymers to form an ophthalmic device.
13 . The method of claim 12 , wherein the one or more ophthalmic device forming polymers comprise one of a polymer film, a melt pellet and a hot melt.
14 . The method of claim 13 , wherein the one of a polymer film, a melt pellet and a hot melt comprises one or more of an aliphatic hydrophilic thermoplastic polyurethane, an aromatic hydrophilic thermoplastic polyurethane, an aliphatic hydrophilic thermoplastic polyester, an aromatic hydrophilic thermoplastic polyester, and a blend of one or more of the aliphatic hydrophilic thermoplastic polyurethane, the aromatic hydrophilic thermoplastic polyurethane, the aliphatic hydrophilic thermoplastic polyester, the aromatic hydrophilic thermoplastic polyester with a hydrophobic silicone.
15 . The method of claim 14 , wherein the aliphatic hydrophilic thermoplastic polyurethane comprises a reaction product of an aliphatic organic diisocyanate, a polyether polyol and a chain extender.
16 . The method of claim 13 , wherein the one of a polymer film, a melt pellet and a hot melt comprises a blend of one or more ophthalmic device forming polymers and one or more silicone polymers.
17 . The method of claim 16 , wherein the one or more silicone polymers include polydimethylsiloxane, dimethicone or both.
18 . The method of claim 13 , wherein the one of a polymer film, a melt pellet and a hot melt comprise a blend of the one or more ophthalmic device forming polymers and one or more silicone-urethane copolymers.
19 . The method of claim 1 , wherein the ophthalmic device is a contact lens.
20 . The method of claim 19 , further comprising hydrating the contact lens to form a soft contact lens.