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US 6,166,236 AGranted
Vinyl carbonate and vinyl carbamate contact lens material monomers
AssigneeBausch & Lomb Incorporated
InventorsRonald E. Bambury, David E. Seelye
Life of this patent
Estimating the term…
Abstract
Novel monomers of the general formula ##STR1## where b is 0 or 1, a is 1, 2, 3 or 4, R.sup.2 is a monovalent alkyl radical and R is an organic radical. The novel monomers may be employed to produce novel copolymers useful as hydrogel, soft non-hydrogel and/or rigid gas permeable contact lens materials.
Claims24
A compound of the general formula:
- wherein:
- a is 1, 2, 3 or 4;
- X is --O--, --S-- or --NR.sup.3 --;
- R is selected from the group consisting of an organosilicon radical, a heterocyclic-containing radical, an adamantyl-containing radical, an alkylene radical, a fluoroalkyl radical, a fluoroalkylene radical and a hydroxyalkyl radical;
- R.sup.2 is H or CH.sub.3 ;
- and
- R.sup.3 is H or a monovalent alkyl radical, provided that when R is a fluoroalkyl radical, X is --NR.sup.3 --.
4 more elements
A compound selected from the group consisting of 4-sec-butylphenyl vinyl carbonate, 4-(t-butyl)cyclohexyl vinyl carbonate, 2,2,2-trifluoro-1-phenylethyl vinyl carbonate, propargyl vinyl carbamate, and N-vinyloxycarbonyl-N'-[tris(trimethylsiloxy)silyl]propyl piperazine.
Dependencies are inferred from the claim text.