Cured cellulose ester, method of curing same, and use thereof
AssigneeUCO Optics, Inc.
InventorsJoseph W. Wittmann, John M. Evans
Life of this patent
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Abstract
Cellulose esters are cured by exposure to radiation preferably followed by exposure to elevated temperatures of at least about 100.degree. C. In addition, polymers obtained from reacting certain cellulose esters with certain polymerizable silicon esters are provided. The cured cellulose esters are suitable for producing transparent parts such as contact lenses.
Claims28
A shaped transparent contact lens of concavo-convex shape with the concave surface substantially conforming to the cornea of the eye, said lens being formed of a composition from the polymerization of a composition comprising an organic cellulose ester selected from the group of cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate or mixtures thereof;
- and a polymerizable ethylenically unsaturated silicone ester.
A blank from which a transparent contact lens of concavo-convex shape can be lathed wherein said blank or button is formed of a composition from the polymerization of a composition comprising an organic cellulose ester selected from the group of cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, or mixtures thereof;
- and a polymerizable ethylenically unsaturated silicone ester.
A rod from which blanks or buttons can be cut and from which a shaped transparent contact lens of concavo-convex shape can be lathed, wherein said rod is formed of a composition from the polymerization of a composition comprising an organic cellulose ester selected from the group of cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, or mixtures thereof;
- and a polymerizable ethylenically unsaturated silicone ester.
Dependencies are inferred from the claim text.