Cured cellulose ester, method of curing same, and use thereof
First Claim
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1. 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.
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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° 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.
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Citations
28 Claims
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1. 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.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. 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.
- View Dependent Claims (26)
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27. 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.
- View Dependent Claims (28)
Specification