UV/visible-absorbing vinylic monomers and uses thereof
Described herein are UV-absorbing vinylic monomers and their uses in preparing UV-absorbing contact lenses capable of blocking ultra-violet (“UV”) radiation and violet radiation with wavelengths from 380 nm to 440 nm, thereby protecting eyes to some extent from damages caused by UV radiation and potentially from violet radiation.
1. A UV-absorbing vinylic monomer, being selected from the group consisting of:
2. A contact lens comprising a crosslinked material which comprises monomeric units of a UV-absorbing vinylic monomer selected from the group consisting of:
3. The contact lens of claim 2 , wherein the contact lens is a hydrogel contact lens.
4. The contact lens of claim 2 , wherein the contact lens is a silicone hydrogel contact lens.
5. The contact lens of claim 2 , wherein the contact lens has: an UVB transmittance of about 10% or less between 280 and 315 nanometers; a UVA transmittance of about 30% or less between 315 and 380 nanometers; a Violet transmittance of about 60% or less between 380 nm and 440 nm; and a water content of from about 15% to about 80% by weight (at room temperature, about 22° C. to 28° C.) when being fully hydrated.
6. A method for producing UV-absorbing contact lenses, comprising the steps of:
(1) obtaining a lens formulation comprising
(a) a UV-absorbing vinylic monomer selected from the group consisting of
(b) a free-radical initiator, and
(c) at least one polymerizable component selected from the group consisting of a hydrophilic vinylic monomer, a hydrophobic vinylic monomer free of silicone, a vinylic crosslinking agent, a siloxane-containing vinylic monomer, a siloxane containing vinylic macromer, a water-soluble prepolymer free of silicone, and a siloxane-containing amphiphilic prepolymer;
(2) introducing the lens formulation into a mold for making a soft contact lens, wherein the mold has a first mold half with a first molding surface defining the anterior surface of a contact lens and a second mold half with a second molding surface defining the posterior surface of the contact lens, wherein said first and second mold halves are configured to receive each other such that a cavity is formed between said first and second molding surfaces; and
(3) curing thermally or actinically the lens formulation in the mold to crosslink the UV-absorbing vinylic monomer and the polymerizable component in the lens formulation to form the UV-absorbing contact lens, wherein the formed UV-absorbing contact lens comprises an anterior surface defined by the first molding surface and an opposite posterior surface defined by the second molding surface and is characterized by having the UVB transmittance of about 10% or less between 280 and 315 nanometers, a UVA transmittance of about 30% or less between 315 and 380 nanometers, and a Violet transmittance of about 60% or less between 380 nm and 440 nm.
7. The method of claim 6 , wherein the free-radical initiator is a thermal initiator, wherein the step of curing is carried out thermally.
8. The method of claim 6 , wherein the free-radical initiator is a photoinitiator, wherein the step of curing is carried out by irradiation with a light having a wavelength within the range from 380 nm to 500 nm.
9. The method of claim 8 , wherein the mold is a reusable mold, wherein the step of curing is carried out under a spatial limitation of radiation.