Reusable lens molds and methods of use thereof
View Patent ↗The present invention general related to a reusable mold and a method of using the mold to manufacture contact lenses. The mold comprises a first mold half having a first mold surface in contact with a lens forming composition and a second mold half having a second mold surface in contact with the lens forming composition, wherein the first mold half and the second mold half are configured to receive each other such that a cavity is formed between the first mold surface and the second mold surface, wherein the cavity defines the shape of a contact lens to be molded, wherein the lens forming composition is polymerizable and/or crosslinkable by an actinic radiation, wherein at least one of the mold halves is a precision press molded mold made from an oxide glass selected from a group consisting of borosilicates glass and fluorophosphates glass.
1. A reusable mold for making a contact lens, comprising a first contact lens mold half having a first mold surface in contact with a silicone- containing lens forming composition and a second mold half having a second contact lens mold surface in contact with the silicone- containing lens forming composition, wherein the first contact lens mold half and the second contact lens mold half are configured to receive each other such that a cavity is formed between the first contact lens mold surface and the second contact lens mold surface, wherein the cavity defines the shape of a contact lens to be molded, wherein the silicone- containing lens forming composition is polymerizable and/or crosslinkable by an actinic radiation, wherein at least one of the contact lens mold halves is a precision press molded mold made from a fluorophosphates glass.
2. The reusable mold for making a contact lens according to claim 1 , wherein the fluorophosphates glass has a glass transition temperature no higher than 600° C.
3. The reusable mold for making a contact lens according to claim 2 , wherein the fluorophosphates glass has a glass transition temperature no higher than 580° C.
4. The reusable mold for making a contact lens according to claim 2 , wherein the fluorophosphates glass has a glass transition temperature no higher than 540° C.
5. The reusable mold for making a contact lens according to claim 2 , wherein the fluorophosphates glass has a transmission of at least 75% for a thickness 1 mm and a wavelength of 253.7 nm.
6. The reusable mold for making a contact lens according to claim 2 , wherein the fluorophosphates glass has a transmission of at least 80% for a thickness 1 mm and a wavelength of 253.7 nm.
7. The reusable mold for making a contact lens according to claim 2 , wherein the fluorophosphates glass has a transmission of at least 85% for a thickness 1 mm and a wavelength of 253.7 nm.
8. A method for producing a contact lens comprising: the steps of:
(1) providing a contact lens mold, wherein the mold comprising a first contact lens mold half having a first mold and a second contact lens mold half having a second mold surface, wherein the first contact lens mold half and the second contact lens mold half are configured to receive each other such that a cavity is formed between the first mold surface and the second mold surface, wherein the cavity defines the shape of a contact lens to be molded, wherein at least one of the mold halves is a precision press molded mold made from a fluorophosphates glass,
(2) introducing a silicone- containing lens-forming composition into the cavity formed by the first and second molding surfaces, material, wherein the lens-forming material is crosslinkable and/or polymerizable by actinic radiation;
(3) crosslinking/polymerizing the lens-forming material in the mold to form a lens having a polymer matrix;
(4) opening the mold and removing the formed contact lens from the mold.
9. The method for producing a contact lens according to claim 8 , wherein the fluorophosphates glass has a glass transition temperature no higher than 600° C.
10. The method for producing a contact lens according to claim 9 , wherein the fluorophosphates glass has a glass transition temperature no higher than 580° C.
11. The method for producing a contact lens according to claim 10 , wherein the fluorophosphates glass has a glass transition temperature no higher than 540° C.
12. The method for producing a contact lens according to claim 8 , wherein the fluorophosphates glass has a transmission of at least 75% for a thickness 1 mm and a wavelength of 253.7 nm.
13. The method for producing a contact lens according to claim 9 , wherein the fluorophosphates glass has a transmission of at least 80% for a thickness 1 mm and a wavelength of 253.7 nm.
14. The method for producing a contact lens according to claim 10 , wherein the fluorophosphates glass has a transmission of at least 85% for a thickness 1 mm and a wavelength of 253.7 nm.
15. The method for producing a contact lens according to claim 8 , wherein the silicone-containing lens-forming composition comprises at least one components selected from the group consisting of a silicone-containing vinylic monomer, a silicone-containing vinylic macromer, a silicone- containing prepolymer, a hydrophilic vinylic monomer, a hydrophobic vinylic monomer, a crosslinking agent, a free-radical initiator (photoinitiator or thermal initiator), a hydrophilic vinylic macromer/prepolymer, and combinations thereof.