Claims
- 1. A hydrogel formed from a hydrophilic polymer comprising:
- a first monomer comprising a hydrophilic compound having the formula: ##STR10## wherein: R is hydrogen or methyl; and
- n is an integer from 1 to 4;
- a second monomer comprising a substantially insoluble acrylate or methacrylate selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, butyl acrylate and butyl methacrylate; and
- a third monomer selected from the group consisting of vinyl acetate, 3-buten-1-ol, 2-propen-1-ol, 5-hexenol, methyl vinyl ether, propyl vinyl ether, butyl 3-buten-1-ol ether, N-methyl vinyl amide, N-propyl vinyl amide, N-ethyl-3-butenzmide, vinyl pyrrolidone, 3-hydroxypropyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, methacrylamide, N-methyl methacrylamide, N-N-dimethyl methacrylamide, and mixtures thereof.
- 2. The hydrogel of claim 1 wherein said first monomer comprises 2,3-dihydroxypropyl methacrylate.
- 3. The hydrogel of claim 1 wherein said second monomer comprises methyl methacrylate.
- 4. The hydrogel of claim 1 wherein said third monomer comprises a compound selected from vinyl pyrrolidone, 2-hydroxyethyl acrylate or methacrylamide.
- 5. The hydrogel of claim 1 wherein said polymer further includes a cross-linking agent selected from the group consisting of, ethylene glycol dimethacrylate, propylene glycol dimethacrylate, ethylene glycol diacrylate, triethanolamine dimethacrylate, triethanolamine trimethacrylate, tartaric acid dimethacrylate, triethylene glycol dimethacrylate, and the dimethacrylate of bis-hydroxyethylacetamide, and glycidyl methacrylate.
- 6. The hydrogel of claim 1 wherein said first monomer comprises 2,3-dihydroxypropyl methacrylate, said second monomer comprises methyl methacrylate and said third monomer comprises a compound selected from the group consisting of vinyl pyrrolidone, 2-hydroxyethyl acrylate, and methacrylamide.
- 7. The hydrogel of claim 1 wherein said polymer further includes a cross-linking agent compriseing glycidyl methacrylate.
- 8. The hydrogel of claim 6 wherein said molar ratio of said first monomer to said second monomer is in the range of from about 1:1 to about 10:1.
- 9. The hydrogel of claim 6 wherein said third monomer comprises vinyl pyrrolidone that is present in a molar ratio of 1:1 to 1.0:0.2 when compared to the total moles of said first and second monomers.
- 10. The hydrogel of claim 6 wherein said third monomer comprises methacrylamide that is present in a molar ratio of 1:1 1.0:0.2 when compared to the total moles of said first and second monomers.
- 11. The hydrogel of claim 6 wherein said third monomer comprises 2-hydroxyethyl acrylate that is present in a molar ratio of 1:1 to 1.0:0.2 when compared to the total moles of said first and second monomers.
- 12. The hydrogel of any one of claims 1 through 11 wherein said polymer comprises water of hydration in an amount of from about 35 to about 50 weight percent.
- 13. The hydrogel of any one of claims 1 through 11 wherein said polymer has a Shore A durometer type A-2 reading of from about 40 to about 50.
- 14. The hydrogel of any one of claims 1 through 11 wherein said polymer when hydrated exhibits a linear expansion of from about 15 to about 25 percent.
- 15. A shaped article made from the hydrogel of any one of claims 1 through 11.
- 16. A contact lens formed from the hydrogel of any one of claims 1 through 11.
Parent Case Info
This is a continuation of application Ser. No. 240,739, filed Mar. 5, 1981, now U.S. Pat. No. 4,379,864; which, in turn, is a division of application Ser. No. 10,992, filed Feb. 9, 1979, now U.S. Pat. No. 4,267,295.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4267295 |
Gallop et al. |
May 1981 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
10992 |
Feb 1979 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
240739 |
Mar 1981 |
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