Claims
- 1. A contact lens formed of a copolymer prepared by polymerizing a prepolymer mixture comprising: (a) a monomer of the general formula (I): ##STR62## wherein: a is 1, 2, 3 or 4;
- b is 0 or 1;
- X is --O--, --S--, or --NR.sup.3 --;
- R is an organic radical;
- R.sup.2 is H or CH.sub.3; and
- R.sup.3 is H or a monovalent alkyl radical; and
- (b) a crosslinking agent.
- 2. A contact lens of claim 1, wherein monomer (a) is a compound of the general formula (I) wherein a is 1.
- 3. A contact lens of claim 2, wherein the crosslinking agent is a monomer of the general formula (II): ##STR63## wherein: X is --O--, --S-- or --NR.sup.3 --;
- R.sup.1 is a multivalent organic radical;
- R.sup.2 is independently --H or --CH.sub.3 ;
- R.sup.3 is independently --H or a monovalent alkyl radical;
- a is 2, 3 or 4; and
- b is 0 or 1.
- 4. A contact lens of claim 1, wherein monomer (a) is a compound of the general formula (I) wherein b is 0.
- 5. A contact lens of claim 4, wherein monomer (a) is a compound of the general formula (I) wherein b is 0, a is 1 and R is a monofunctional organic radical.
- 6. A contact lens of claim 4, wherein monomer (a) is a compound of the general formula (I) wherein R is an organosilicon radical.
- 7. A contact lens of claim 4, wherein monomer (a) is 3-[tris(trimethylsiloxy)silyl]propyl vinyl carbonate.
- 8. A contact lens of claim 4, wherein monomer (a) is 3-[tris(trimethylsiloxy)silyl]propyl vinyl carbamate.
- 9. A contact lens of claim 4, wherein monomer (a) is 3-(vinyloxycarbonylthio)propyl[tris(trimethylsiloxy)silane].
- 10. A contact lens of claim 4, wherein monomer (a) is 3-(trimethylsilyl)propyl vinyl carbonate.
- 11. A contact lens of claim 4, wherein monomer (a) is trimethylsilylmethyl vinyl carbonate.
- 12. A contact lens of claim 4, wherein monomer (a) is trimethylsilylethyl vinyl carbonate.
- 13. A contact lens of claim 4, wherein monomer (a) is 4-t-butylphenyl vinyl carbonate.
- 14. A contact lens of claim 4, wherein monomer (a) is t-butyldimethylsiloxyethyl vinyl carbonate.
- 15. A contact lens of claim 4, wherein monomer (a) is 4-t-butylphenyl vinyl carbamate.
- 16. A contact lens of claim 4, wherein monomer (a) is 2,2,2-trifluoroethyl vinyl carbonate.
- 17. A contact lens of claim 4, wherein monomer (a) is 2,2,2-trifluoroethyl vinyl carbamate.
- 18. A contact lens of claim 4, wherein monomer (a) is 1,1,1,3,3,3-hexafluoro-2-propyl vinyl carbonate.
- 19. A contact lens of claim 4, wherein monomer (a) is 2,2,2-trifluoro-1-phenylethyl vinyl carbonate.
- 20. A contact lens of claim 4, wherein monomer (a) is 2-hydroxyethyl vinyl carbonate.
- 21. A contact lens of claim 4, wherein monomer (a) is 2-hydroxyethyl vinyl carbamate.
- 22. A contact lens of claim 5, wherein the crosslinking agent is of the formula: ##STR64## where x is on average 26.
- 23. A contact lens of claim 3, wherein the crosslinking agent is a compound described by the general formula (II) where a equals 2, and R.sup.1 is of the formula: ##STR65## where x and z are 1 to 6, y is on average between 2 and 200, and R" is an alkyl radical or a fluorinated alkyl radical.
- 24. A contact lens of claim 4, wherein monomer (a) is selected from the group consisting of 4-(t-butyl)cyclohexyl vinyl carbonate, 1-adamantane vinyl carbonate, 1-adamantane methyl vinyl carbonate, 1-adamantane ethyl vinyl carbonate, 1-adamantane vinyl carbamate, and 2,2,2-trifluoro-1-phenylethyl vinyl carbonate.
- 25. A contact lens of claim 1, wherein the crosslinking agent is selected from the group consisting of propargyl vinyl carbamate, 1,2-bis-(vinyloxycarbonyloxy)ethane, .alpha. -.omega.-bis-(vinyloxycarbonyl)triethylene glycol, .alpha.-.omega.-bis(vinyloxycarbonyl)polyethylene glycol, .alpha.-.omega.-bis (vinyloxycarbonyl)polypropylene glycol, 2,2-dimethyl-1,3-bis-(vinyloxycarbonyloxy)propane, N,O-bis-(vinyloxycarbonyl)-ethanolamine, 2,2-dimethyl-N,N-bis-(vinyloxycarbonyl)-1,3-propanediamine, and 1,5-bis-(vinyloxycarbonyloxy)-2,2,3,3,4,4-hexafluoropentane.
- 26. A contact lens of claim 1, wherein the monomer and crosslinking agent are copolymerizable by free-radical polymerization and the crosslinking agent contains ethylenic unsaturation.
Parent Case Info
This is a divisional of copending U.S. Ser. No. 07/724,091 filed on Jul. 19, 1991, which is a Divisional of U.S. Ser. No. 07/346,204 filed May 2, 1989, now U.S. Pat. No. 5,070,215.
US Referenced Citations (15)
Foreign Referenced Citations (6)
Number |
Date |
Country |
079814 |
May 1983 |
EPX |
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EPX |
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DEX |
Non-Patent Literature Citations (4)
Entry |
Beilsteins Handbuch (vol. 3, p. 12) (with translation). |
"Poly(vinyl Chloroformate) and Derivatives: Preparation and Properties", J.R.Schaefgen, J. Polymer Sci:Part C, vol. 24, pp. 75-88 (1968). |
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Divisions (2)
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Number |
Date |
Country |
Parent |
724091 |
Jul 1991 |
|
Parent |
346204 |
May 1989 |
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