Tinted, high DK ophthalmic molding and a method for making same
View Patent ↗The invention relates to ophthalmic molding formulations and to tinted, high Dk ophthalmic moldings. This invention also relates to a method for making a tinted ophthalmic molding. The method comprises: (a) providing a polymer precursor having cross-linkable or polymerizable groups; (b) providing a pigment dispersion comprising an inorganic or organic pigment and a dispersing agent; (c) mixing the pigment dispersion with the polymer precursor to form a tinted prepolymer mixture; (d) dispensing the tinted prepolymer mixture into a mold; and (e) forming a tinted ophthalmic molding from the tinted prepolymer mixture, the molding comprising a polymer matrix having the pigment entrapped therein. With this method, tinted ophthalmic moldings, particularly edge-to-edge soft, tinted contact lenses having improved properties, are prepared with an improved efficiency.
1. A soft, tinted contact lens, comprising:
(i) a core material including a polymer matrix which is a polymerization product of a prepolymerization mixture including an oxyperm polymerizable material and an ionoperm polymerizable material, wherein the ratio of weight percentage of the oxyperm polymerizable material to the ionoperm polymerizable material is selected to impart to the contact lens an oxygen transmissibility (Dk/t) of at least about 60 barrers/mm;
(ii) particles of a pigment incorporated in the polymer matrix; and
(iii) a hydrophilic surface.
2. The soft, tinted contact lens of claim 1 , wherein the hydrophilic surface is obtained by a surface treatment process.
3. The soft, tinted contact lens of claim 2 , wherein the oxyperm polymerizable material comprises polysiloxane-containing macromer and/or a siloxane-containing monomer.
4. The soft, tinted contact lens of claim 2 , wherein the pigment comprises an organic pigment, an inorganic pigment, or a mixture thereof.
5. The soft, tinted contact lens of claim 2 , wherein the surface treatment process is a process in which, by means of contact with a vapor or liquid, and/or by means of application of an energy source, (1) a coating is applied to the surface of the contact lens, (2) chemical species are adsorbed onto the surface of the contact lens, (3) the chemical nature of chemical groups on the surface of the contact lens are altered, or (4) the surface properties of the contact lens are modified.
6. The soft, tinted contact lens of claim 1 , wherein the contact lens is coated with a layer of a hydrophilic polymeric material.
7. The soft, tinted contact lens of claim 6 , wherein the oxyperm polymerizable material comprises polysiloxane-containing macromer and/or a siloxane-containing monomer.
8. The soft, tinted contact lens of claim 6 , wherein the pigment comprises an organic pigment, an inorganic pigment, or a mixture thereof.
9. The soft, tinted contact lens of claim 1 , wherein the hydrophilic surface is obtained by using a plasma treatment process.
10. The soft, tinted contact lens of claim 9 , wherein in the plasma treatment process an ionized gas is applied to the surface of the core material.
11. The soft, tinted contact lens of claim 10 , wherein the core material is plasma treated in the presence of a mixture of (a) a C 1-6 alkane and (b) a gas selected from the group consisting of nitrogen, argon, oxygen, and mixtures thereof.
12. The soft, tinted contact lens of claim 10 , wherein the core material is plasma treated in the presence of a mixture of methane and air.
13. The soft, tinted contact lens of claim 9 , wherein the oxyperm polymerizable material comprises polysiloxane-containing macromer and/or a siloxane-containing monomer.
14. The soft, tinted contact lens of claim 9 , wherein the pigment comprises an organic pigment, an inorganic pigment, or a mixture thereof.
15. The soft, tinted contact lens of claim 1 , wherein the oxyperm polymerizable material comprises polysiloxane-containing macromer and/or a siloxane-containing monomer.
16. The soft, tinted contact lens of claim 1 , wherein the pigment comprises an organic pigment, an inorganic pigment, or a mixture thereof.
17. The soft, tinted contact lens of claim 1 , wherein the oxyperm polymerizable material comprises a siloxane-containing macromer.