Claims
- 1. An ophthalmic lens comprising the cured product of a composition comprising:60-99 wt % of a poly(allyl carbonate) of a polyhydroxy alcohol, said polyhydroxy alcohol having from 2 to 20 carbon atoms and from 2 to 6 hydroxy groups in the molecule; 0.01-10 wt % of at least one radical initiator; 0-20 wt % of comonomers; and a cyclohexyl diallyl ester oligomer in an amount of 0.05 to 20 wt %, having the formula I wherein X denotes a divalent hydrocarbon residue derived from a diol having 2-20 carbon atoms, optionally partly replaced by a residue derived from a polyol having 3 or more carbon atoms and 3-10 hydroxy groups, and n=1-100.
- 2. Ophthalmic lens according to claim 1, wherein the cyclohexyl diallyl ester oligomer is present in said composition in an amount of up to 15 wt %.
- 3. Ophthalmic lens according to claim 1, wherein the cyclohexyl diallyl ester oligomer is present in the composition in an amount of 0.05 to 5 wt %.
- 4. Ophthalmic lens according to claim 1, wherein X denotes the following groups:
- 5. Ophthalmic lens according to claim 1, having a refractive index of 1.497 to 1.505.
- 6. Ophthalmic lens according to claim 1, having a Barcol hardness of at least 28.
- 7. Ophthalmic lens according to claim 1, wherein the polyallyl carbonate of polyhydroxy alcohol is present in the composition in the form of a monomer.
- 8. Ophthalmic lens according to claim 7, wherein the monomer of polyallyl carbonate of polyhydroxyl alcohol is diethylene glycol bisallyl carbonate.
- 9. Ophthalmic lens according to any of the previous claims, wherein the radical initiator is diisopropylperoxy dicarbonate.
- 10. Ophthalmic lens according to claim 1 exhibiting a shrinkage less than 20%.
- 11. Process for the production of ophthalmic lenses with a refractive index of 1.497 to 1.505 comprising polymerization casting of a curable composition comprising:60-99 wt % of at least one poly(allyl carbonate) of a polyhydroxy alcohol, said polyhydroxy alcohol having from 2 to 20 carbon atoms and from 2 to 6 hydroxy groups in the molecule; to 10 wt % of at least one radical initiator; and 0-20 wt % of comonomers, at 30-100° C. for 0.5-100 hours, wherein the polymerization casting is carried out in the presence of a cyclohexyl diallyl ester oligomer in an amount of 0.05 to 20 wt %, having the formula I
- 12. Ophthalmic lens according to any of the claims 1-10 obtainable by the process of claim 11.
Priority Claims (1)
Number |
Date |
Country |
Kind |
97203005 |
Sep 1997 |
EP |
|
Parent Case Info
The present invention is a continuation of International Patent Application No. PCT/EP98/06039, filed on Sep. 17, 1998 and claims priority of European Patent Application No. 97203005.0, filed on Sep. 30, 1997.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5663279 |
Kuiper et al. |
Sep 1997 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
114080 |
Jul 1984 |
EP |
302537 |
Feb 1989 |
EP |
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WO |
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/EP98/06039 |
Sep 1998 |
US |
Child |
09/539483 |
|
US |