Polarized films with specific light filters
Disclosed are polarized films containing specific light filters that block transmission of harmful electromagnetic radiation. Also disclosed are methods of producing said films as well as ophthalmic lenses having increased eye health.
1. A polarized film comprising at least one dichroic dye capable of providing polarized function, and at least one light filter capable of decreasing light transmission at specific ranges of wavelengths to provide a dedicated light filtering function, wherein the at least one dichroic dye or at least one light filter is capable of decreasing the percent transmittance (% T) of the film in the NIR range of 700-1400 nm at least about 5% compared to a polarized film without said dichroic dye or light filter.
2. The polarized film according to claim 1 , wherein the polarized film further comprises polyvinyl alcohol (PVOH).
3. The polarized film of claim 2 , wherein the PVOH has a degree of polymerization that is equal to or greater than 1500.
4. A method to prepare the polarized film of claim 2 , the method comprising:
(a) preparing one or several solutions containing at least one light filter and at least one dichroic dye in water, where the light filter and dichroic dye are in the same solution or in separate solutions;
(b) submersing the PVOH film in the solution(s) from step (a) for an amount of time and pulling the film within the solution(s) to remove wrinkles; and
(c) stretching the film within the solution(s) to get polarizing function.
5. A method to prepare a polarized lens comprising the method of claim 4 , the method further comprising:
(d) laminating the film from step (c) with polycarbonate (PC) on both sides;
(e) thermoforming the laminate into curved wafers; and
(f) injection molding polycarbonate (PC) on the concave side.
6. The method of claim 4 , wherein the at least one dichroic dye or at least one light filter is capable of decreasing the transmission of ultraviolet (UV) light at and below 400 nm.
7. The method of claim 4 , wherein the at least one dichroic dye or at least one light filter is capable of decreasing the transmission of blue-violet light from 415 to 455 nm.
8. The polarized film according to claim 1 , wherein the at least one dichroic dye is iodine.
9. The polarized film according to claim 1 , wherein the at least one dichroic dye or at least one light filter is capable of decreasing the transmission of ultraviolet (UV) light at and below 400 nm.
10. The polarized film according to claim 1 , wherein the at least one dichroic dye or at least one light filter is capable of decreasing the transmission of blue-violet light from 415 to 455 nm.
11. The polarized film of claim 1 , wherein the at least one light filter comprises water soluble cut dyes or absorbers of UV, blue-violet, IR, or combinations thereof.
12. The polarized film of claim 11 , wherein the blue-violet cut dye or absorber is coumarin, porphyrin, perylene, melanin, acriflavine, proflavine, chlorophyll, Lucifer yellow, auramine, or derivative thereof and/or the IR cut dye or absorber is amminium salt, cyanines, metal dithiolenes, phtalocyanines, anthraquinone, tetraaryldiamines, or derivative thereof.
13. A multilayer polarized laminate comprising the polarized film of claim 1 , wherein the polarized film further comprises at least one outer layer adhering to the polarized film, wherein the outer layer is composed of polycarbonate (PC), cellulose triacetate (TAC), polyolefinics, polyacrylates, polyesters, polyamides, polysiloxanes, polyimides, polyurethanes, polythiourethanes, polyallylics, polysulfides, polyvinyls, polyarylenes, polyoxides, and polysulfones, or combinations thereof.
14. A polarized ophthalmic lens with specific filter function comprising the multilayer polarized laminate of claim 13 and at least one substrate, wherein the substrate is:
a thermoplastic material comprising at least one polycarbonate (PC), polyolefinics, (meth)acrylic or thio(meth)acrylic polymers and copolymers, polyesters, polyamides, polysiloxanes, polyimides, polyurethanes, polythiourethanes, polyallylics, polysulfides, polyvinyls, polyarylenes, polyoxides, and polysulfones, and combinations thereof; or
a thermoset material comprising at least one resin resulting from the polymerization or (co)polymerization of alkylene glycol bis allyl carbonates.
15. The polarized film of claim 1 , wherein a percent transmittance (% T) of the film in the range of 415-455 nm decreases at least about 10% compared to a polarized film without a blue-violet light filter.
16. A polarized ophthalmic lens with specific filter function comprising the polarized film of claim 1 and at least one substrate, wherein the substrate is:
a thermoplastic material comprising at least one polycarbonate (PC), polyolefinics, (meth)acrylic or thio(meth)acrylic polymers and copolymers, polyesters, polyamides, polysiloxanes, polyimides, polyurethanes, polythiourethanes, polyallylics, polysulfides, polyvinyls, polyarylenes, polyoxides, and polysulfones, and combinations thereof; or
a thermoset material comprising at least one resin resulting from the polymerization or (co)polymerization of alkylene glycol bis allyl carbonates.