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US 2010/0072641 A1Published application
Method for Cast Molding Contact Lenses
OwnerAlice Weimin Liu, Norris M. Tollefson +1inventors
InventorsAlice Weimin Liu, Norris M. Tollefson, Dale Richard Kosman
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Abstract
An improved method of cast molding contact lenses, wherein a lens forming mixture is cured in the lens-shaped cavity formed between molding surfaces of a male and female mold sections, wherein the improvement comprises at least one of sections is injection molded from a copolymer of propylene and ethylene.
Claims7
A method of cast molding contact lenses, comprising the steps of:
- introducing a lens forming material into a mold, wherein the mold comprises a male section and a female section, wherein the male section and the female section are configured to receive each other to form a lens forming cavity, wherein at least one of the male section and the female section is injection molded from a copolymer of propylene and ethylene, wherein the copolymer comprises ethylene from about 0.1 percent to about 2.0 percent by weight and has a flexural modulus from about 950 to 1400 MPa;
- curing the lens forming material in the lens forming cavity to form a contact lens.
Dependencies are inferred from the claim text.