Contact lenses with identifying mark
View Patent ↗The present invention is related to a method for making contact lenses with identifying mark, in particular to silicone hydrogel contact lenses. The present invention is also related to a method of high intensity UV curing the identifying mark print on the mold and high intensity UV treating mold for making silicone hydrogel contact lenses with identifying mark.
1. A method of making silicone-hydrogel contact lenses, comprising the step of:
(a) providing a mold assembly comprising a female mold half having a molding surface and a male mold half having a molding surface;
(b) applying at least one identifying mark coat to at least a portion of at least one of the female molding surface and the male molding surface with an ink, wherein the ink comprises a silicone-containing polymer binder;
(c) irradiating the identifying mark coat on the molding surface with a first high intensity UV light to at least partially cure the identifying mark coat;
(d) irradiating the molding surfaces of the female mold and the male mold with a second high intensity UV light prior to step e);
(e) filling a lens-forming fluid material comprising at least one silicone-containing vinylic monomer or macromer and at least one hydrophilic vinylic monomer into the irradiated mold assembly from step d);
(f) exposing the mold assembly and the lens-forming fluid material to an energy source, wherein the energy source polymerizes the lens-forming fluid material; wherein emission spectrum of the first high intensity UV light has a higher intensity in wavelength range 320-390 nm by at least 200 mW/cm2 and a lower intensity in wavelength range 250-260 nm by at least 10 mW/cm2 than the second high intensity UV light.
2. The method of claim 1 , wherein the identifying mark coat is a clear identifying mark coat.
3. The method of claim 2 , wherein the identifying mark coat comprising invisible fluorescent dyes, or pigments.
4. The method of claim 2 , wherein the identifying mark coat comprising a material has a different refractive index from the polymerized lens-forming material.
5. The method of claim 2 , wherein the identifying mark coat comprising a controlled release substance.
6. The method of claim 1 , wherein the intensity of the second high intensity UV light is about 150-600 mW/cm 2 at a wavelength range of about 320-390 nm, and about 45-125 mW/cm 2 at a wavelength of about 250-260 nm.
7. The method of claim 6 , wherein in step (d) the second high intensity UV light irradiates for about from 0.1 to 20 seconds.
8. The method of claim 7 , wherein in step (d) the second high intensity UV light irradiates for about from 0.5 to 5 seconds.
9. The method of claim 1 , wherein in step (c) the first high intensity UV light irradiates for about from 1 to 25 seconds.
10. The method of claim 9 , wherein in step (c) the first high intensity UV light irradiates for about from 2 to 10 seconds.
11. The method of claim 1 , wherein the energy of the first high intensity UV light is about 300-800 mJ/cm 2 at a wavelength range of about 320-390 nm.
12. The method of claim 11 , wherein the energy of the second high intensity UV light is about 15-100 mJ/cm 2 at a wavelength range of about 250-260 nm.
13. The method of claim 1 , wherein the intensity of the first high intensity UV light is about 650-750 mW/cm 2 at a wavelength range of about 320-390 nm, and about 35-45 mW/cm 2 at a wavelength of about 250-260 nm.
14. The method of claim 1 , wherein the identifying mark coat is a colored identifying mark coat.