Polarized PVA wafer for reducing optical distortion

Abstract

The present disclosure relates to a polarizing wafer comprising: A1) a thermoplastic film; B) a PVA polarizing film; and A2) a thermoplastic film, stacked together in the following order: A1) and A2) are the same or different; the thicknesses of A1) and A2) are the same or different; the thicknesses of A1) and A2) are each 80 μm or less; and the thickness of B) is 40 μm or less; and / or the total thickness of the polarizing wafer is 180 μm or less. The present disclosure also relates to an ophthalmic lens comprising this wafer, a process for making such an ophthalmic lens, and the use of the polarizing wafer to impart polarizing properties to an ophthalmic lens while avoiding or limiting optical distortion.

Description

[Technical Field]

[0001] SUMMARY The present disclosure relates to polymeric ophthalmic lenses with polarizing properties.

[0002] The present invention particularly relates to the use of polarizing wafers to impart polarizing properties to ophthalmic lenses while avoiding or limiting optical distortion.

[0003] The present invention also relates to a process for making such an ophthalmic lens.

[0004] The present invention also relates to a primer coated wafer. [Background technology]

[0005] An optical wafer may be included in an ophthalmic lens to provide the ophthalmic lens with a function, which may be a light absorbing function (e.g., to absorb UV, visible, and / or IR light), a photochromic function, a polarizing function, or a color enhancing function.

[0006] Thus, an optical wafer is a film that has suitable optical and thermomechanical properties for inclusion in an ophthalmic lens, including a functional film that provides the lens with the desired functionality. In some cases, the wafer may be the ophthalmic lens itself.

[0007] An optical wafer may be included in an ophthalmic lens by inserting the optical wafer into a lens mold and injection molding (in the case of a thermoplastic lens substrate) or casting (in the case of a thermoset lens substrate) the lens substrate against the optical wafer in the lens mold. Thus, the optical wafer may be included on the front surface of the lens substrate, the back surface of the lens substrate, or embedded in the lens substrate.

[0008] An optical wafer may also be included in an ophthalmic lens by laminating the optical wafer onto a lens substrate, in which case an adhesive may be used to ensure strong adhesion of the optical wafer onto the lens substrate.

[0009] Generally, optical wafers are manufactured from films having the same layer structure as the wafers by cutting them to the desired dimensions.

[0010] If the optical wafer is to be incorporated into the ophthalmic lens by injection molding or casting, it is also necessary to form the wafer prior to injection molding or casting in order to give the wafer a curvature that matches the desired curvature of the lens. Said forming is carried out by applying heat and pressure to the wafer in a forming machine.

[0011] During this process, it is important to protect the wafer or the film used to produce the wafer in order to avoid cosmetic defects in the final lens. For example, the wafer or the film used to produce the wafer needs to be protected from possible contamination or scratches. For this purpose, the optical wafer or the film used to produce the wafer is covered with a peelable liner on one or both of its major surfaces. The liner is removed as needed in the final step of the process (for example, before the injection molding or casting step or before laminating the optical wafer onto the lens substrate).

[0012] Polarizing wafers are typically made from PVA film. They are widely used, for example, in sunglass lenses. To enhance the wafer's robustness and facilitate its handling during lens casting, the polarizing PVA film can be sandwiched between two transparent protective layers of thermoplastic material.

[0013] Typically, the total thickness of the TAC / PVA / TAC wafer is about 200 μm.

[0014] However, the wafer and polymer material of the lens exhibit different mechanical properties, such as hardness.

[0015] After being released from the casting cell, the lens may undergo further processing, such as surface finishing and hard coating, and may be exposed to high temperatures. During these processes, the polymer material of the lens releases stress and deforms. The deformation of the polymer material is not at the same level as the wafer deformation. Furthermore, the deformation in the thinnest region of the lens is not the same as the thickest region. This difference in deformation can cause optical distortion of the lens. It has been found that there is a correlation between the optical distortion of the lens and the thickness of the wafer. The thicker the wafer, the greater the optical distortion. Summary of the Invention [Problem to be solved by the invention]

[0016] The wafer of the present disclosure aims to remedy these drawbacks. [Means for solving the problem]

[0017] The present specification discloses the following items.

[0018] A. stacked on top of each other in the following order: A1) a thermoplastic film; B) PVA polarized film; A2) Thermoplastic film A polarizing wafer comprising: A1) and A2) are the same or different; The thickness of A1) and the thickness of A2) are the same or different, and The thickness of A1) and the thickness of A2) are each 80 μm or less, B) A polarized wafer having a thickness of 40 μm or less.

[0019] Abis. Stacked on top of each other in the following order: A1) Thermoplastic film B) PVA polarized film; A2) Thermoplastic film A polarizing wafer comprising: A1) and A2) are the same or different; The thickness of A1) and the thickness of A2) are the same or different, and The total thickness of the polarizing wafer is 180 μm or less.

[0020] B. The polarizing wafer of item A, wherein the total thickness of the polarizing wafer is 180 μm or less.

[0021] C. The polarizing wafer according to any one of Items A to B, wherein the thermoplastic film A1) consists of a single thermoplastic layer.

[0022] D. The polarizing wafer according to any one of items A to C, wherein the thermoplastic film A2) consists of a single thermoplastic layer.

[0023] E. The polarized wafer of any one of items A to D, wherein the PVA polarized film B) consists of a single thermoplastic layer.

[0024] F. The polarizing wafer according to any one of items A to E, wherein the thickness of A1) and the thickness of A2) are the same or different and are 25 μm to 80 μm, in particular 28 μm to 60 μm, in particular 30 μm to 55 μm, in particular 33 μm to 50 μm, in particular 35 μm to 45 μm, in particular 36 μm to 44 μm, in particular 37 μm to 43 μm, in particular 38 μm to 42 μm, in particular 39 μm to 41 μm.

[0025] The polarizing wafer according to any one of items A to F, wherein the thickness of the GB) is 25 μm to 35 μm, particularly 26 μm to 34 μm, particularly 27 μm to 33 μm, particularly 28 μm to 32 μm, and particularly 29 μm to 31 μm.

[0026] H. The polarizing wafer according to any one of items A to G, wherein the total thickness of the polarizing wafer is 50 μm to 150 μm, particularly 75 μm to 150 μm, and particularly 75 μm to 125 μm.

[0027] I. The polarized wafer according to any one of items A to H, further comprising an intermediate adhesive layer C1) between film B) and film A1) and / or an intermediate adhesive layer C2) between film B) and film A2).

[0028] J. The polarized wafer according to item I, wherein the thickness of the intermediate adhesive layer C1) and the thickness of the intermediate adhesive layer C2) are the same or different and are 4 μm or less.

[0029] K. The polarizing wafer according to item J, wherein the thickness of A1) and the thickness of C2) are the same or different and are between 0.5 μm and 3.5 μm, in particular between 1 μm and 3 μm, in particular between 1.5 μm and 2.5 μm.

[0030] L. Polarized wafer thermoplastic films A1) and A2), - PVA polarizing film B) and - if applicable, an adhesive layer C1), - adhesive layer C2) if applicable The polarizing wafer according to any one of items A to K, comprising:

[0031] M. The polarized wafer according to any one of items A to L, further comprising a dry primer layer D1) applied onto film A1) and / or a dry primer layer D2) applied onto film A2), wherein D1) and D2) are the same or different.

[0032] N. The polarizing wafer of item M, wherein the thickness of D1) and the thickness of D2) are the same or different and each are 4 μm or less.

[0033] O. The polarizing wafer according to item N, wherein the thickness of D1) and the thickness of D2) are the same or different and are 0.5 μm to 3.5 μm, particularly 1 μm to 3 μm, and particularly 1.5 μm to 2.5 μm.

[0034] P. The polarizing wafer of any one of paragraphs A-O, wherein thermoplastic films A1) and A2) independently comprise polycarbonate (PC), polymethyl methacrylate (PMMA), polyamide (nylon), polyester (PET), cellulose acetate butyrate (CAB), triacetyl cellulose (TAC), cyclic olefin copolymer (COC), or a mixture thereof.

[0035] Q. The polarizing wafer according to any one of items A to P, which has a curved shape.

[0036] AA. A polarized ophthalmic lens comprising a polymeric material and a polarized wafer according to any one of items A-Q, wherein the polarized wafer is embedded in the polymeric material or disposed on a surface of the polymeric material.

[0037] BB. The polarized ophthalmic lens of paragraph AA, wherein the polymeric material is a thermosetting polymer or a thermoplastic polymer.

[0038] CC. The polarized ophthalmic lens of paragraph BB, wherein the thermoplastic polymer is polycarbonate.

[0039] DD. The polarized ophthalmic lens according to paragraph BB, wherein the thermosetting polymer is a urethane or thiourethane polymer or diethylene glycol bisallyl carbonate.

[0040] EE. The polarized ophthalmic lens of any one of paragraphs AA-DD, wherein the thickness of the polymeric material throughout the polarized ophthalmic lens is not uniform.

[0041] FF. The polarized ophthalmic lens according to any one of items AA to EE, having a curved shape.

[0042] GG. The polarized ophthalmic lens of any one of paragraphs AA through FF, further comprising a hard coat applied to at least one surface of the polarized ophthalmic lens.

[0043] HH. The polarized ophthalmic lens according to any one of items AA to GG, wherein the ophthalmic lens is a semi-finished or finished lens.

[0044] AAA. A method for producing a polarized ophthalmic lens according to any one of items AA to FF, comprising the following steps: - providing a polarized wafer according to any one of items A to P; - providing a liquid polymerizable composition containing monomers or oligomers that, when polymerized, form a polymeric material; - cutting and shaping the polarizing wafer to obtain a curved polarizing wafer; - placing a curved polarizing wafer in a casting cell; - introducing a polymerizable liquid composition into a casting cell and depositing the polymerizable liquid composition onto one side of the polarizing wafer or such that the polarizing wafer is embedded in the polymerizable liquid composition; - polymerizing the polymerizable liquid composition in a casting cell, thereby obtaining a polymerized material; - Releasing the polymerized material and A method comprising:

[0045] BBB. The polymeric material is surface-finished, as described in item AAA.

[0046] CCC. The polymeric material is hard coated, the method of claim AAA or BBB.

[0047] AAAA. Use of the polarizing wafer of any one of paragraphs A-Q in an ophthalmic lens of any one of paragraphs AA-HH, wherein the polarizing wafer is embedded in or disposed on the surface of a polymeric material to impart polarizing properties to the lens while avoiding or limiting optical distortion. [Brief explanation of the drawings]

[0048] [Figure 1] Profile graph obtained from a 2D map of the lens surface. DETAILED DESCRIPTION OF THE INVENTION

[0049] The wafer of the present disclosure allows for good processability in forming and casting. It is thinner than other commercially available TAC / PVA / TAC laminates. The PVA film is protected and encapsulated by two layers of TAC film on both sides, further providing advantages in terms of handling.

[0050] The molding process remains simple: no film processing steps are required, allowing for good cost savings in the molding and casting process.

[0051] The polarized wafers of the present disclosure can be used to manufacture polarized ophthalmic lenses with refractive indices of 1.5, 1.6 and 1.67 obtained by a casting process.

[0052] The polarized wafers of the present disclosure provide better customer perception, improved quality, and reduced manufacturing costs.

[0053] Polarized Wafer The polarizing wafer may be attached to one surface of the lens, to two surfaces of the lens, or embedded in the lens, or any combination thereof.

[0054] Polarized wafers can be manufactured using thin polyvinyl alcohol (PVA) polarized films. To produce lenses containing PVA polarized films, the PVA polarized films undergo several handling steps, including thermoforming, cutting to the desired diameter, applying a primer, and fitting into a casting cell. The fragile nature of thin PVA polarized films combined with these multiple processing steps can increase the likelihood of film damage. Therefore, the polarized PVA films of the present disclosure are laminated between thermoplastic films, such as triacetyl cellulose (TAC) films, to provide a robust, protective support layer on the PVA film surface. A polarized wafer containing a PVA polarized film laminated between TAC thermoplastic films can be referred to as a TAC-PVA-TAC laminate.

[0055] Thermoplastic film A1) and thermoplastic film A2) may be the same or different.

[0056] The thickness of A1) and the thickness of A2) may be the same or different and each may be 80 μm or less, in particular the thickness of A1) and the thickness of A2) may be the same or different and each may be 50 μm or less.

[0057] In one embodiment, the thickness of the thermoplastic film A1) and the thickness of the thermoplastic film A2) are the same or different and are 25 μm to 80 μm, in particular 28 μm to 60 μm, in particular 30 μm to 55 μm, in particular 33 μm to 50 μm, in particular 35 μm to 45 μm, in particular 36 μm to 44 μm, in particular 37 μm to 43 μm, in particular 38 μm to 42 μm, in particular 39 μm to 41 μm.

[0058] The thickness of the PVA polarizing film B) is 40 μm or less.

[0059] In one embodiment, the thickness of B) is 25 μm to 35 μm, in particular 26 μm to 34 μm, in particular 27 μm to 33 μm, in particular 28 μm to 32 μm, in particular 29 μm to 31 μm.

[0060] In one embodiment, the wafer of the present disclosure further comprises an intermediate adhesive layer C1) disposed between film B) and layer A1) and / or an intermediate adhesive layer C2) disposed between film B) and layer A2).

[0061] The intermediate adhesive layer may comprise polyurethane, glyoxal, or EVOH.

[0062] In one embodiment, the thickness of the intermediate adhesive layer C1) and the thickness of the intermediate adhesive layer C2) are the same or different and are each 4 μm or less.

[0063] In one embodiment, the thickness of C1) and the thickness of C2) are the same or different and are between 0.5 μm and 3.5 μm, in particular between 1 μm and 3 μm, especially between 1.5 μm and 2.5 μm.

[0064] In one embodiment, the wafer further comprises a dry primer layer D1) applied over layer A1) and / or a dry primer layer D2) applied over layer A2), where D1) and D2) are the same or different.

[0065] A primer layer can be used to improve the adhesion of the TAC film to the polymer material of the lens. For example, KR993596B1 describes a primer coating for improving adhesion between a TAC film and a cast CR-39 plastic lens with an embedded TAC laminate. WO2018 / 052454 and WO2019175354A1 describe primer coatings for improving adhesion between a TAC film and a cast CR-39 plastic lens with an embedded TAC laminate. To produce a CR-39 lens with an embedded TAC laminate, a TAC laminate with a primer coating deposited on the lens-contacting surface of the laminate is placed in a CR-39 monomer so that both surfaces of the TAC polarizing laminate are in contact with the CR-39 monomer. The CR-39 monomer is polymerized to provide a solid polarized lens in which the polarizing function is provided by the TAC polarizing laminate embedded within the lens. WO 2021 / 170702 describes a primer coating to improve adhesion of a TAC polarizing laminate (TAC-on-TOP) placed and cast onto a poly(thio)urethane lens, such as an ultra-high refractive index UHI Mitsui MR-7® lens. In a TAC-on-TOP lens, there is only one adhesive interface: the AC film or TAC laminate to the UHI lens. Because TAC itself may not have sufficient adhesion to the UHI lens, a primer coating may be required to bond the TAC film or TAC laminate to the UHI lens.

[0066] The primer composition can be applied to any one surface of the wafer or to both surfaces of the wafer. Preferably, the primer composition is applied to one major surface of the wafer.

[0067] The primer composition can be applied to the wafer by any method, including, but not limited to, spraying or roll coating. The primer composition can be air-dried or air-oven dried and cured by exposure to UV radiation or heat. Preferably, the primer composition is air-oven dried and then cured by UV radiation before the next step.

[0068] The degree of cure of the primer composition is not limited. For example, the primer composition can be considered to be sufficiently cured if it does not move on the surface of a wafer in a casting cell for casting a lens as described below. Furthermore, the primer composition can be considered to be sufficiently cured if the primer coating composition does not appear wet.

[0069] To maintain the integrity of the surface quality, a protective film layer can be applied over the dried primer-coated wafer. In a roll-to-roll process, the wound-up roll with the protective film layer attached can be safely stored.

[0070] After applying the primer coating composition, the wafer can be formed into a desired shape before applying a liner to protect the primer surface.For example, the wafer can be curved to fit into a casting cell for casting lenses, or cut to a suitable shape or size.Preferably, after the primer coating composition is fully cured by UV or heat, the wafer is formed into a desired shape.

[0071] The thickness of D1) and the thickness of D2) may be the same or different.

[0072] The thickness of D1) and the thickness of D2) may each be 4 μm or less.

[0073] In one embodiment, the thickness of D1) and the thickness of D2) are the same or different and are between 0.5 μm and 3.5 μm, in particular between 1 μm and 3 μm, especially between 1.5 μm and 2.5 μm.

[0074] Thermoplastic film layers A1) and A2) can be the same or different and independently comprise polycarbonate (PC), polymethyl methacrylate (PMMA), polyamide (nylon), polyester (PET), cellulose acetate butyrate (CAB), triacetyl cellulose (TAC), cyclic olefin copolymer (COC), or mixtures thereof.

[0075] In one embodiment, the wafer of the present disclosure has a curved shape.

[0076] Eye lenses The polarized ophthalmic lenses of the present disclosure include a polymeric material and the aforementioned polarizing wafer embedded in or disposed on the surface of the polymeric material.

[0077] In one embodiment, the polymeric material is a thermosetting polymer [CR39, MR7] or a thermoplastic polymer.

[0078] In one embodiment, the polarized ophthalmic lens has a curved shape.

[0079] In one embodiment, the thickness of the polymeric material throughout the polarized ophthalmic lens is not uniform, and indeed, typically the thickness at the center of the lens is less than the thickness at the periphery of the lens.

[0080] In one embodiment, the thermoplastic polymer is a polycarbonate.

[0081] In one embodiment, the thermosetting polymer is a urethane or thiourethane polymer [MR-7] or diethylene glycol bisallyl carbonate [CR39].

[0082] For example, poly(thio)urethane lenses, such as MR-7® lenses, having a refractive index of approximately 1.67, can be produced by polymerizing MR-7A® (a diisocyanate) and MR-7B® (a trithiol). Poly(thio)urethane lenses can be high refractive index lenses (1.60) or ultra-high refractive index lenses (1.67). Poly(thio)urethane lenses often have ultra-high refractive indices and may be preferably used in the production of high-end eyeglasses.

[0083] In one embodiment, the aforementioned polarized ophthalmic lens further comprises a hard coat applied to at least one surface of the polarized ophthalmic lens.

[0084] In one embodiment, the ophthalmic lens is a semi-finished or finished lens.

[0085] Polarized Eye Lens Manufacturing Process The lens of the present disclosure comprises the steps of: - stacked on top of each other in the following order: A1) a thermoplastic film layer; B) PVA polarized film; A2) a thermoplastic film layer; A polarizing wafer comprising: A1) and A2) are the same or different; The thickness of A1) and the thickness of A2) are the same or different, and The thickness of A1) and the thickness of A2) are each 80 μm or less, for example, less than 50 μm; B) providing a polarized wafer having a thickness of 40 μm or less; - providing a liquid polymerizable composition containing monomers or oligomers that, when polymerized, form a polymeric material; - cutting and shaping the polarizing wafer to obtain a curved polarizing wafer; - placing a curved polarizing wafer in a casting cell; - introducing a polymerizable liquid composition into a casting cell and depositing the polymerizable liquid composition onto one side of the polarizing wafer or such that the polarizing wafer is embedded in the polymerizable liquid composition; - polymerizing the polymerizable liquid composition in a casting cell, thereby obtaining a polymerized material; - Releasing the polymerized material and It can be produced by a process including:

[0086] In one embodiment, the monomers include at least one urethane monomer, preferably at least one thiourethane lens casting monomer such as MR-7®.

[0087] In one embodiment, the monomer comprises CR39, a blend of allyl monomers and oligomers derived from diethylene glycol bis(allyl carbonate). [ka]

[0088] The wafer and polymerizable liquid composition can be placed in the casting cell so that a lens is formed on one surface of the wafer. The wafer and polymerizable liquid composition can also be placed in the casting cell so that the wafer is embedded in the lens. Preferably, the wafer and polymerizable liquid composition are placed in the casting cell so that a lens is formed on the side of the wafer to which the dried primer layer composition is applied.

[0089] Any suitable casting cell can be used for casting a lens, and the casting conditions are not limited so long as a lens is properly formed from the lens-casting monomer in the casting cell.

[0090] After the lens is formed, it is demolded, ie, removed from the casting cell, and optionally subjected to appropriate treatments such as prescription surface treatments, hard coatings, and anti-reflective coatings.

[0091] use Another aspect of the present disclosure is the use of the polarizing wafer of the present disclosure in an ophthalmic lens comprising a polymeric material, wherein the polarizing wafer is embedded in or disposed on the surface of the polymeric material to impart polarizing properties to the lens while avoiding or limiting optical distortion.

[0092] general definition As defined herein, an ophthalmic lens is a lens designed to be used in a monocle or eyeglasses (including sunglasses, goggles, and safety glasses). As defined herein, contact lenses are not ophthalmic lenses. Ophthalmic lenses are typically used to protect the eye and / or correct vision. Ophthalmic lenses can be non-corrective ophthalmic lenses (also called plano lenses or afocal lenses) or corrective ophthalmic lenses. Corrective lenses can be monofocal, bifocal, trifocal, or progressive lenses. As defined herein, an ophthalmic lens can be a finished lens or a semi-finished lens. A semi-finished lens undergoes various processing steps, such as surfacing, tinting, coating, and edging, before finally being included in eyeglasses or a monocle. A finished lens is ready to be included in eyeglasses or a monocle.

[0093] As defined herein, a film is a laminate of one or more layers.

[0094] A layer corresponds to the thickness of a given material between two interfaces. As defined herein, a stack of two or more layers is not a layer. Generally, it is possible to observe the interface between two consecutive layers using a microscope.

[0095] The layers can be assembled by coextrusion or by pressing the layers against each other. In some cases, inserting an adhesive layer between the two layers before pressing them together helps to assemble the two layers. In some cases, the electrostatic forces between the layers are sufficient to assemble them using only minimal pressure. As defined herein, an adhesive layer is considered a layer.

[0096] In the present disclosure, the polymeric material may comprise only one polymer or a blend of polymers, in which case it should be understood that in addition to said only one polymer or polymer blend, the layer may comprise additives.

[0097] As defined herein, a film or layer "disposed on" a surface is defined as a film or layer that (a) is disposed on that surface, (b) need not be in direct contact with that surface, i.e., one or more intervening layers may be disposed between the surface and the film or layer in question, and (c) need not completely cover the surface. Preferably, however, the film or layer completely covers the surface. [Example]

[0098] The wafers tested were as follows (thicknesses indicated; where "layers" are plural, there are two identical such layers and the thickness indicated is the thickness of one layer):

[0099] [Table 1]

[0100] For each wafer, lens samples were obtained as follows: - The curved wafer was placed in the casting cell; - CR39 was introduced into the casting cell and deposited on the concave side of the curved wafer; - CR39s was polymerized to obtain semi-finished lens samples; The semi-finished lens samples were surfaced to a center thickness of 2.1 mm and a sphere of -6.0 diopters to obtain finished lens samples.

[0101] For each lens, a 2D map of the lens surface was measured using a Dual Lens Mapper (by Automation & Robotics SA). The profile graphs presented in Figure 1 were obtained from these 2D maps. They represent the power error (i.e., the deviation compared to the target power of the lens, corresponding to the undesired distortion) measured on the convex surface of the lens.

[0102] It can be seen that lens samples 1 and 2 have satisfactory power errors, whereas lens samples 3 and 4 have much higher errors. At the same time, compared to lens sample 1, lens sample 2 was much easier to obtain (wafer 2 is protected by a TAC layer and is therefore easier to handle, whereas wafer 1 requires an additional conditioning step and is more demanding in terms of controlling humidity and temperature conditions).

Claims

1. Stacked on top of each other in the following order: A1) a thermoplastic film; B) a PVA polarizing film; A2) Thermoplastic film A polarizing wafer comprising: A1) and A2) are the same or different; The thickness of A1) and the thickness of A2) are the same or different, and The thickness of A1) and the thickness of A2) are each 80 μm or less, B) A polarizing wafer having a thickness of 40 μm or less.

2. Stacked on top of each other in the following order: A1) a thermoplastic film; B) a PVA polarizing film; A2) Thermoplastic film A polarizing wafer comprising: A1) and A2) are the same or different; The thickness of A1) and the thickness of A2) are the same or different, and A polarizing wafer, wherein the total thickness of the polarizing wafer is 180 μm or less.

3. The polarizing wafer of claim 1 , wherein the total thickness of the polarizing wafer is 180 μm or less.

4. 4. The polarizing wafer according to claim 1, wherein the thickness of A1) and the thickness of A2) are the same or different and are 25 μm to 80 μm, in particular 28 μm to 60 μm, in particular 30 μm to 55 μm, in particular 33 μm to 50 μm, in particular 35 μm to 45 μm, in particular 36 μm to 44 μm, in particular 37 μm to 43 μm, in particular 38 μm to 42 μm, in particular 39 μm to 41 μm.

5. 5. The polarizing wafer according to claim 1, wherein B) has a thickness of 25 μm to 35 μm, in particular 26 μm to 34 μm, in particular 27 μm to 33 μm, in particular 28 μm to 32 μm, in particular 29 μm to 31 μm.

6. The polarizing wafer according to any one of claims 1 to 5, wherein the total thickness of the polarizing wafer is from 50 μm to 150 μm, in particular from 75 μm to 150 μm, in particular from 75 μm to 125 μm.

7. 7. The polarizing wafer of claim 1, further comprising an intermediate adhesive layer C1) between film B) and film A1) and / or an intermediate adhesive layer C2) between film B) and film A2).

8. The polarizing wafer is thermoplastic films A1) and A2), PVA polarizing film B), - if applicable, an adhesive layer C1), - adhesive layer C2), if applicable; The polarizing wafer according to any one of claims 1 to 7, comprising:

9. 9. The polarizing wafer of claim 1, further comprising a dry primer layer D1) applied onto the film A1) and / or a dry primer layer D2) applied onto the film A2), wherein D1) and D2) are the same or different.

10. 10. The polarizing wafer of claim 1, wherein the thermoplastic films A1) and A2) independently comprise polycarbonate (PC), polymethyl methacrylate (PMMA), polyamide (nylon), polyester (PET), cellulose acetate butyrate (CAB), triacetyl cellulose (TAC), cyclic olefin copolymer (COC), or a mixture thereof.

11. The polarizing wafer according to any one of claims 1 to 10, which has a curved shape.

12. A polarized ophthalmic lens comprising a polymeric material and a polarizing wafer according to any one of claims 1 to 11, wherein the polarizing wafer is embedded in the polymeric material or disposed on a surface of the polymeric material.

13. The polarized ophthalmic lens according to claim 12, wherein the ophthalmic lens is a semi-finished or finished lens.

14. 14. A method for producing a polarized ophthalmic lens according to claim 12 or 13, comprising the following steps: - providing a polarizing wafer according to any one of items 1 to 10; - providing a liquid polymerizable composition containing monomers or oligomers that, when polymerized, form said polymeric material; - cutting and shaping said polarizing wafer to obtain a curved polarizing wafer; - placing the curved polarizing wafer in a casting cell; - introducing the polymerizable liquid composition into the casting cell and depositing the polymerizable liquid composition onto one side of the polarized wafer or such that the polarized wafer is embedded in the polymerizable liquid composition; - polymerizing said polymerizable liquid composition in said casting cell, thereby obtaining a polymerized material; - releasing the polymerized material from the mold; A method comprising:

15. 14. Use of a polarizing wafer according to any one of claims 1 to 11 in an ophthalmic lens according to claim 12 or 13, wherein the polarizing wafer is embedded in or disposed on the surface of the polymer material to impart polarizing properties to the lens while avoiding or limiting optical distortion.

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