Ophthalmic lenses
AssigneeGreat Lakes Chemical Corporation
InventorsWillem Bos, Ricardo Henry Breeveld, Marjan Elisabeth Van Der Zanden
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Abstract
The invention relates to 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 60 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.
Claims12
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.
Ophthalmic lens according to any of the previous claims, wherein the radical initiator is diisopropylperoxy dicarbonate.
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
Dependencies are inferred from the claim text.