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US 5,006,622 AGranted
Polymer compositions for contact lenses
AssigneeBausch & Lomb Incorporated
InventorsJay F. Kunzler, Gary D. Friends
Life of this patent
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Abstract
Branched alkylhydroxycycloalkyl methacrylate monomers, such as t-butylhydroxycyclohexyl methacrylate, are polymerized with hydrophilic monomers and crosslinking agents to produce compositions for shaped biomedical devices, including soft contact lenses. Such copolymers have high oxygen permeability and good mechanical properties.
Claims3
The polymerization product of a mixture comprising:
- 35 to 90 part by weight of N-vinylpyrrolidone;
- 0.1 to 5 parts by weight of crosslinking agent;
- 0.01 to 5 parts by weight of catalyst;
- and 10 to 65 parts by weight of a strengthening agent represented by the general formula
- wherein:
- R.sup.1 is O or NH;
- R.sup.2 is a divalent alkylene radical chosen from the group consisting of --CH.sub.2 --, --CHOH-- and --CHR.sup.4 wherein R.sup.4 is a branched alkyl group with 3 to 8 carbon atoms, and
- R.sup.3 is H or CH.sub.3 ;
- and wherein at least one R.sup.2 radical is --CHOH-- and at least one R.sup.2 is --CHR.sup.4 and are separated by at least one --CH.sub.2 -- radical, and n is 4, 5, 6 or 7.
6 more elements
Dependencies are inferred from the claim text.