Reusable lens molds and methods of use thereof
View Patent ↗Described herein are devices for producing ophthalmic lenses including at least one mold half defining an optical surface where the mold half is made from a polymer that includes an aromatic polyimide, a polyphenylene, or a combination thereof. The devices exhibit numerous advantages including, but not limited to, good chemical resistance, durability, machineability, and UV absorbing properties. Also described are methods for producing ophthalmic lenses using the devices described herein. The ophthalmic lenses produced with the devices described herein exhibit excellent optical properties when compared to lenses produced from conventions molds.
1. A reusable device for producing an ophthalmic lens comprising a female mold half define an optical surface and a male mold half defining an optical surface, wherein the female mold half is made from a polymer comprising an aromatic polyimide, and wherein the male mold half is made from polyphenylene, quartz, glass, and wherein the aromatic polyimide comprises repeat units comprising the formula I, II, or III:
wherein R 1 is substituted or unsubstituted aromatic ring, the four carbonyl groups are attached directly to separate carbon atoms in the aromatic ring, and each pair of carbonyl groups is attached to adiacent carbon atoms in the aromatic ring; and R 2 comprises a second substituted or unsubsituted aromatic ring.
2. A reusable device of claim 1 , wherein the polymer absorbs UV light in the range of 250 to 400 nm.
3. A reusable device of claim 1 , wherein the polymer substantially prevents the reflection and transmission of UV light from the device.
4. A reusable device of claim 1 , wherein the polymer comprises a thermoplastic polymer or a thermoset resin.
5. A reusable device of claim 1 , wherein the polyphenylene comprises a plurality of residues comprising the formula IV
wherein R 6 , R 7 , and R 8 are, independently, hydrogen, a straight chain or branched alkyl, aryl, alkaryl aralkyl, alkyl amide, aryl amide, alkyl ester, aryl ester, alkoxy, polyalkeneoxy, polyphenylene oxide, polyvinyl chloride, polyalkylmethacrylate, polyacrylonitrile, polyalkylvinyl ether, polyvinyl alcohol, polyvinyl acetate, perfluoroalkyl, perfluoroalkoxy, polyester, polyamide, polyimide, poly(phenoxyphenyl ketone), ether, sulfone, aryl ketone, alkyl ketone, or heteroaryl; and o, p, and q are, independently, 0, 1,2, or 3.
6. A reusable device of claim 5 , wherein each aromatic ring is attached at the para position.
7. A reusable device of claim 5 , wherein the polyphenylene comprises repeat units comprising the formula V
8. A reusable device of claim 5 , wherein the polyphenylene comprises repeat units comprising the formula VI
9. The reusable device of claim 1 , wherein R1 comprises phenyl, napthyl, anthracene, phenanthrene, or pyrene.
10. The reusable device claim 1 , wherein R 2 comprises the formula
11. The device of claim 10 , wherein R 1 comprises a phenyl group and R 2 comprises
12. A method for producing an ophthalmic lens comprising the steps of:
(a) introducing a lens forming material into a female mold half defining an optical surface and configured to form a cavity for receiving a lens forming material;
(b) applying a male mold defining an optical surface to the female mold comprising the lens forming material, wherein the male mold and female mold are configured to receive each other and form a mold cavity, wherein the optical surface of at least one mold half is made from a polymer comprising an aromatic polyimide; wherein the aromatic polyimide comprises repeat units comprising the formula I, II or III;
wherein R 1 is a substituted or unsubstituted aromatic ring, the four carbonyl groups are attached directly to separate carbon atoms in the aromatic ring, and each pair of carbonyl groups is attached to adjacent carbon atoms in the aromatic ring; and R 2 comprises a second substituted or unsubstituted aromatic ring; and
(c) exposing the lens forming material to energy in order to crosslink the lens forming material and produce the lens.
13. The method of claim 12 , wherein the female mold half is made from the polymer comprising an aromatic polyimide.
14. The method of claim 12 , wherein both the female mold half and the male mold half are, independently, made from the polymer comprising an aromatic polyimide.
15. The method of claim 12 , wherein the male mold half comprises quartz or glass.
16. The method of claim 12 , wherein at least one mold half is permeable to UV light in the range of 250 to 400 nm.
17. The method of claim 12 , wherein step (c) comprises irradiating the lens forming material with UV light in the range of 250 to 400 nm for a sufficient time in order to crosslink the lens forming material and produce the lens.
18. The method of claim 12 , wherein step (c) comprises heating the lens forming material for a sufficient time to crosslink the lens forming material and produce the lens.
19. The method of claim 12 , wherein the female mold half is made from a polymer comprising an aromatic polyimide; and step (c) comprises irradiating the lens forming material with UV light in the range of 250 to 400 nm for a sufficient time in order to crosslink the lens forming material and produce the lens.
20. The method of claim 12 , wherein the lens comprises a contact lens.