Molds for producing contact lenses
AssigneeJohnson & Johnson Vision Care, Inc.
InventorsChanghong Yin, Scott F. Ansell
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Abstract
This invention describes molds made from alicyclic co-polymers that are useful in the production of contact lenses and methods for their use.
Claims5
A mold for making a lens comprising an alicyclic co-polymer wherein said alicyclic co-polymer comprises at least two alicyclic monomers of different chemical structures wherein one curve of the mold comprises said alicyclic co-polymer and the other curve of the mold comprises a Ziegler-Natta catalyst based polypropylene wherein the one curve comprises an alicyclic co-polymer having a MFR of about 11.0 grams/10 minutes to about 18.0 grams/10 minutes, a specific gravity of 1.01 and a glass transition temperature of 105° C. and the other curve comprises polypropylene having a melt flow of less than about 21 g/10 min and an alicyclic co-polymer having a melt flow of 11.0 grams/10 minutes to about 18.0 grams/10 minutes and a glass transition temperature of 105°.
A mold for making a lens comprising an alicyclic co-polymer wherein said alicyclic co-polymer comprises at least two alicyclic monomers of different chemical structures wherein one curve of the mold comprises said alicyclic co-polymer and the other curve of the mold comprises a Ziegler-Natta catalyst based polypropylene wherein the other curve comprises an alicyclic co-polymer having a MFR of about 11.0 grams/10 minutes to about 18.0 grams/10 minutes, a specific gravity of 1.01 and a glass transition temperature of 105° C. and the one curve comprises polypropylene having a melt flow of less than about 21 g/10 min and an alicyclic co-polymer having a MFR of about 11.0 grams/10 minutes to about 18.0 grams/10 minutes, a specific gravity of 1.01 and a glass transition temperature of 105° C.
Dependencies are inferred from the claim text.