Multilayer body, polarizing sheet, thermally-bent molded body, and polarizing lens

Abstract

Provided are: a multilayer body; and a polarizing sheet, a thermally-bent molded body, and a lens, in all of which the multilayer body is used. This multilayer body has a polycarbonate film having a thickness of 150-3000 μm, and a transparent conductive layer. The transparent conductive layer contains polyethylenedioxythiophene and polystyrene sulfonate.

Description

Multilayer body, polarizing sheet, heat-bent body, and polarizing lens

[0001] The present invention relates to a multilayer body, a polarizing sheet, a heat-bent body, and a polarizing lens.

[0002] Currently, polarizing sheets in practical use typically use a polarizing film in which iodine or a dichroic organic dye is adsorbed or impregnated into a polyvinyl alcohol (PVA) multilayer. This polarizing film usually has a transparent resin such as triacetyl cellulose on one or both sides as a protective film for the polarizing film, making it easy to handle, suitable for secondary processing, and inexpensive, lightweight polarizing plates.

[0003] Here, applications requiring impact resistance, such as polarized lenses for sunglasses, are typically manufactured by forming a polarizing sheet using a polarizing multilayer layer using a dichroic organic dye and a functional layer such as a polarizing multilayer layer and a photochromic layer, using a thermoplastic resin multilayer such as an aromatic polycarbonate film as a polarizing film substrate, punching the sheet into a desired shape, hot bending the sheet into a partial spherical surface, and appropriately applying a surface treatment, etc. An example of such a sheet for hot bending is described in Patent Document 1.

[0004] Japanese Patent Application Laid-Open No. 2003-145616

[0005] Here, a high surface temperature is sometimes required for the above-mentioned sheet for heat bending. Specific examples include polarized lenses for eyeglasses and sunglasses. However, when a sheet for heat bending is used for a polarized lens, an excessively high surface temperature is undesirable as it can cause burns and other injuries. In other words, a multilayer body that can be moderately heated and heat-bent is required. The present invention aims to solve this problem by providing a multilayer body that can be moderately heated and heat-bent, as well as a polarizing sheet, a heat-bent body, and a polarized lens using the same.

[0006] In light of the above-mentioned problems, the present inventors have conducted research and found that the above-mentioned problems can be solved by providing a transparent conductive layer containing polyethylenedioxythiophene and polystyrenesulfonic acid on a polycarbonate film of a predetermined thickness. Specifically, the above-mentioned problems have been solved by the following means. <1> A multilayer body having a polycarbonate film having a thickness of 150 to 3000 μm and a transparent conductive layer, the transparent conductive layer containing polyethylenedioxythiophene and polystyrenesulfonic acid. <2> The multilayer body according to <1>, in which the polycarbonate film contains bisphenol A polycarbonate. <3> The multilayer body according to <1> or <2>, in which the transparent conductive layer has a thickness of 0.3 to 3 μm. <4> The multilayer body according to any one of <1> to <3>, which is for use in heat bending processing. <5> The multilayer body according to any one of <1> to <4>, wherein the polycarbonate film contains bisphenol A polycarbonate, the transparent conductive layer has a thickness of 0.3 to 3 μm, and the multilayer body is suitable for heat bending. <6> A polarizing sheet comprising the multilayer body according to any one of <1> to <5> and a polarizing film. <7> A heat-bent product of the multilayer body according to any one of <1> to <5>. <8> A lens comprising the polarizing sheet according to <6>.

[0007] The present invention makes it possible to provide a multilayer body that can be heated to a moderately high surface temperature and can be subjected to a heat bending process, as well as a polarizing sheet, a heat-bent body, and a lens that use the same.

[0008] FIG. 2 is a schematic diagram illustrating an example of a layer structure of the heat-bent molded body of the present embodiment.

[0009] A detailed description of an embodiment of the present invention (hereinafter simply referred to as "the present embodiment") is provided below. The present embodiment is an example for explaining the present invention, and the present invention is not limited to this embodiment. In this specification, the use of "to" means that the numerical values ​​before and after the "to" symbol include the upper and lower limits. Furthermore, any combination of the upper and lower limits of a numerical value in this specification is an example of this embodiment. In this specification, various physical property values ​​and characteristic values ​​are those at 23°C unless otherwise specified. The term "multilayer body" in this specification includes those in the form of a sheet. A "sheet" refers to a generally flat molded body that is thin relative to its length and width. Furthermore, "multilayer body" and "sheet" in this specification may be single-layer or multi-layer. If the measurement methods, etc. described in the standards set forth in this specification vary from year to year, they shall be based on the standards in effect as of January 1, 2023, unless otherwise specified. If the measurement methods, etc. described in the standards set forth in this specification are discontinued as of January 1, 2023, they shall be based on the standards in effect at the time of discontinuation. The scale of Figure 1 may not be consistent with reality.

[0010] <Multilayer Body> The multilayer body of this embodiment comprises a polycarbonate film having a thickness of 150 to 3000 μm and a transparent conductive layer, the transparent conductive layer containing polyethylenedioxythiophene and polystyrene sulfonic acid. This configuration makes it possible to provide a multilayer body that can be moderately heated and subjected to heat bending, as well as polarizing sheets, heat-bent articles, and lenses using the same. That is, by using a polycarbonate film and a transparent conductive layer, the multilayer body can also be subjected to heat bending. Furthermore, by using polyethylenedioxythiophene and polystyrene sulfonic acid as conductors incorporated into the transparent conductive layer, a structure with a moderately high surface temperature can be achieved. Furthermore, the multilayer body of this embodiment maintains its ability to maintain a moderately high surface temperature even after heat bending.

[0011] <Polycarbonate Film with a Thickness of 150 to 3000 μm> The multilayer body of this embodiment includes a polycarbonate film with a thickness of 150 to 3000 μm. The polycarbonate film typically constitutes the base material of the multilayer body of this embodiment. It is also conceivable to use a polyester film such as a polyethylene terephthalate film or a polyolefin film such as a polypropylene film as the base material of the multilayer body for heat bending. However, these thermoplastic resin films are prone to problems such as poor shaping during heat bending. In this embodiment, the use of a polycarbonate film makes heat bending easier. In this embodiment, the polycarbonate preferably contains a bisphenol-type polycarbonate. A bisphenol-type polycarbonate refers to a polycarbonate in which 80 mol % or more, preferably 90 mol % or more, and more preferably 95 mol % or more of the structural units constituting the polycarbonate are carbonate structural units derived from bisphenol (preferably bisphenol A) and / or its derivatives. In this embodiment, the polycarbonate film preferably contains bisphenol A polycarbonate.

[0012] The molecular weight of the polycarbonate used in this embodiment is not particularly limited, but is preferably 20,000 or more, more preferably 30,000 or more, in weight-average molecular weight. The weight-average molecular weight is preferably 100,000 or less, more preferably 70,000 or less. By setting the weight-average molecular weight at or above the lower limit, the strength of the resulting multilayer body (preferably a multilayer body for hot bending processing) can be increased. Furthermore, by setting the weight-average molecular weight at or below the upper limit, moldability tends to be improved. In this embodiment, two or more polycarbonates with different weight-average molecular weights may be mixed, in which case the weight-average molecular weight refers to the weight-average molecular weight of the mixture.

[0013] The glass transition temperature (Tg) of the polycarbonate used in this embodiment is preferably 160 ° C. or less, more preferably 155 ° C. or less, even more preferably 154 ° C. or less, even more preferably 153 ° C. or less, even more preferably 152 ° C. or less, and even more preferably 151 ° C. or less. The glass transition temperature (Tg) of the polycarbonate used in this embodiment is, for example, 140 ° C. or more, and may further be 143 ° C. or more, 145 ° C. or more, 147 ° C. or more, or 148 ° C. or more. The glass transition temperature is measured according to the description in paragraph 0056 of JP 2022-080270 A. When the polycarbonate film in this embodiment contains two or more polycarbonates, the glass transition temperature of the polycarbonate is the sum of the values ​​obtained by multiplying the glass transition temperatures of each polycarbonate by their mass fractions.

[0014] For details of the polycarbonate, the descriptions in paragraphs 0011 to 0020 of JP-A-2012-144604 and the descriptions in paragraphs 0014 to 0035 of JP-A-2019-002023 can be referred to as long as they do not deviate from the spirit of this embodiment, and the contents of these can be incorporated into this specification.

[0015] The polycarbonate used in the present embodiment may be a recycled polycarbonate product (including recovered products, material recycled products, chemical recycled products, etc.), a rejected product, or scraps generated when molding a molded product from a polycarbonate resin composition.

[0016] In the polycarbonate film, the polycarbonate preferably accounts for 85% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 97% by mass or more, even more preferably 99% by mass or more, and is 100% by mass or less. The polycarbonate film may also contain components other than polycarbonate. Examples of components other than polycarbonate include thermoplastic resins other than polycarbonate, antioxidants, release agents, heat stabilizers, flame retardants, flame retardant assistants, colorants, antistatic agents, fluorescent brighteners, antifogging agents, flow improvers, plasticizers, dispersants, antibacterial agents, antiblocking agents, impact improvers, sliding improvers, color improvers, acid trapping agents, etc. When the polycarbonate film contains components other than polycarbonate, the total content of these components is preferably less than 10% by mass of the polycarbonate film, and more preferably less than 3% by mass.

[0017] The thickness of the polycarbonate film is 150 μm or more, preferably 200 μm or more, and more preferably 250 μm or more. By making the thickness equal to or greater than the lower limit, the rigidity of molded articles such as polarizing sheets tends to be ensured. Furthermore, the thickness of the polycarbonate film is 3000 μm or less, preferably 2500 μm or less, more preferably 2100 μm or less, even more preferably 1900 μm or less, even more preferably 1500 μm or less, even more preferably 1000 μm or less, and even more preferably 800 μm or less. By making the thickness equal to or less than the upper limit, the heat bending processability tends to be improved. Furthermore, by making the thickness of the polycarbonate film 1000 μm or less, it becomes possible to obtain a multilayer body with excellent winding properties.

[0018] <Transparent Conductive Layer> The multilayer structure of this embodiment includes a transparent conductive layer containing polyethylenedioxythiophene and polystyrene sulfonic acid (sometimes referred to herein as "PEDOT / PSS"). PEDOT / PSS has a characteristic of increasing electrical resistance with increasing temperature (PCT characteristic). That is, PEDOT / PSS has the property that current flows easily (low resistance) at low temperatures and becomes less responsive (high resistance) at high temperatures. Furthermore, PEDOT / PSS exhibits a rapid increase in resistance above a certain temperature, suppressing the flow of current and effectively preventing abnormal overheating. Furthermore, by providing a transparent conductive layer over the entire surface of the multilayer structure (e.g., covering 90% or more of the surface area of ​​one side), a uniform temperature distribution can be achieved, maintaining a moderate temperature. Furthermore, because PEDOT / PSS does not necessarily have high heat-generating properties, it is not suitable for use in small-area components such as sunglasses (e.g., when the surface area of ​​one side of the multilayer structure is 5 to 1000 cm). ２ When used in a material having a thickness of approximately 1000 mm, suitable heat generation can be achieved.

[0019] In this embodiment, the transparent conductive layer contains polyethylenedioxythiophene (PEDOT) and polystyrene sulfonic acid (PSS). Typically, PEDOT is the conductive polymer, and PSS serves as a dopant. The mass ratio of PEDOT to PSS in the transparent conductive layer used in this embodiment is preferably 90:10 to 10:90, more preferably 85:15 to 15:85, and even more preferably 80:20 to 20:80. Within this range, the surface resistivity can be kept low, and the stability of the surface resistivity is excellent, particularly in high-temperature environments, making this a preferred embodiment.

[0020] The content of PEDOT / PSS in the transparent conductive layer is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, even more preferably 30 parts by mass or more, even more preferably 40 parts by mass or more, and even more preferably 70 parts by mass or more, when the total mass of the transparent conductive layer is 100 parts by mass, and is preferably 99.999 parts by mass or less, more preferably 99.99 parts by mass or less, even more preferably 99.9 parts by mass or less, even more preferably 99.8 parts by mass or less, and even more preferably 99.7 parts by mass or less. By setting the content at or above the lower limit, conductivity tends to be further improved. Meanwhile, by setting the content at or below the upper limit, deterioration of transparency tends to be more effectively suppressed.

[0021] The transparent conductive layer of this embodiment may contain components other than PEDOT / PSS, such as binder resins, surfactants, leveling agents, lubricants, crosslinking agents, antistatic agents, antioxidants, colorants (pigments, dyes, etc.), flowability modifiers (thixotropic agents, thickeners, etc.), film-forming aids, preservatives, and conductivity improvers (glycidyl compounds, polar solvents, polyhydric aliphatic alcohols, lactam compounds).

[0022] The amount of binder resin in the transparent resin layer of this embodiment is preferably 0.001 parts by mass or more, more preferably 0.01 parts by mass or more, even more preferably 0.015 parts by mass or more, even more preferably 0.02 parts by mass or more, even more preferably 0.03 parts by mass or more, and preferably 1 part by mass or less, more preferably 0.8 parts by mass or less, even more preferably 0.5 parts by mass or less, and even more preferably 0.3 parts by mass or less, when the total mass of the transparent resin layer is 100 parts by mass. By setting the amount to be equal to or greater than the lower limit, conductivity and adhesion to the substrate tend to be further improved. Furthermore, by setting the amount to be equal to or less than the upper limit, an increase in haze due to the refractive index difference with the conductive polymer tends to be more effectively suppressed. The transparent conductive layer of this embodiment may contain only one type of binder resin, or may contain two or more types. When two or more types are contained, the total amount preferably falls within the above range.

[0023] The total amount of surfactants, leveling agents, lubricants, crosslinking agents, antistatic agents, antioxidants, colorants (pigments, dyes, etc.), flowability modifiers (thixotropic agents, thickeners, etc.), film-forming aids, preservatives, and conductivity improvers in the transparent resin layer of this embodiment is preferably 0.001 parts by mass or more, more preferably 0.01 parts by mass or more, and preferably 3 parts by mass or less, more preferably 1 part by mass or less, when the total mass of the transparent resin layer is 100 parts by mass. Each of these components may contain only one kind, two or more kinds, or none.

[0024] For details of components other than PEDOT / PSS that may be contained in the transparent conductive layer, please refer to the descriptions in paragraphs 0042 to 0059 of JP-A-2018-116244 and the descriptions in paragraphs 0014 to 0018 of JP-A-2013-105520, the contents of which are incorporated herein by reference.

[0025] In this embodiment, the transparent conductive layer can be formed, for example, by applying a transparent conductive layer-forming composition containing PEDOT / PS to the surface of a polycarbonate film and drying the composition. The thickness of the resulting transparent conductive layer can be adjusted by adjusting the thickness of the applied film. The transparent conductive layer-forming composition containing PEDOT / PSS preferably contains PEDOT / PSS, a binder resin, and a solvent. For other methods of forming the transparent conductive layer, please refer to the descriptions in paragraphs

[0060] to

[0068] of JP 2018-116244 A and the description in paragraph

[0019] of JP 2013-105520 A, the contents of which are incorporated herein by reference.

[0026] In this embodiment, the surface resistivity of the transparent conductive layer is 10 １ ~10 ３ It is preferably Ω / sq.

[0027] In this embodiment, the thickness of the transparent conductive layer is preferably 0.3 μm or more, more preferably 0.5 μm or more, even more preferably 0.7 μm or more, even more preferably 0.8 μm or more, and even more preferably 0.9 μm or more. It is also preferably 3 μm or less, more preferably 2.5 μm or less, even more preferably 1.9 μm or less, even more preferably 1.5 μm or less, and even more preferably 1.2 μm or less, depending on the application. By setting the thickness at or above the lower limit, excellent conductivity and a more appropriate heat generation effect tend to be achieved. Furthermore, by setting the thickness at or below the upper limit, the resistance of the conductive layer can be maintained appropriately and transparency can be further improved.

[0028] <Layer Structure> The multilayer body of this embodiment may consist of only one or more polycarbonate film layers and one or more transparent conductive layers, or may include other layers. Specifically, the multilayer body of this embodiment may be subjected to one or more of the following treatments on one or both surfaces: anti-fingerprint treatment, anti-reflection treatment, anti-glare treatment, weather-resistant treatment, antistatic treatment, and antifouling treatment. The methods for the anti-reflection treatment, antifouling treatment, anti-static treatment, weather-resistant treatment, and anti-glare treatment are not particularly limited, and known methods can be used. Examples include a method of applying a reflection-reducing coating, a method of vapor-depositing a dielectric thin film, and a method of applying an antistatic coating. The multilayer body of this embodiment may further include other layers, such as a hard coat layer, an adhesive layer, a pressure-sensitive adhesive layer, or an antifouling layer. For the hard coat layer, the descriptions in paragraphs 0045 to 0055 of JP-A-2013-020130, the descriptions in paragraphs 0073 to 0076 of JP-A-2018-103518, and the descriptions in paragraphs 0062 to 0082 of JP-A-2017-213771 can be referred to, and the contents of these can be incorporated into this specification.

[0029] The total thickness of the multilayer body of this embodiment is preferably 0.04 mm or more, more preferably 0.1 mm or more, and even more preferably 0.3 mm or more, and is preferably 5.0 mm or less, more preferably 4.0 mm or less, and even more preferably 3.0 mm or less, still more preferably 2.5 mm or less, and even more preferably 2.0 mm or less.

[0030] The haze of the multilayer body of this embodiment is preferably 10% or less, more preferably 5% or less, even more preferably 3% or less, and even more preferably 1% or less. It is also preferably 0% or more. The haze (unit: %) can be measured using a haze meter under conditions of a D65 light source and a 10° field of view. The above haze is achieved by, for example, not including pigments, dyes, or other additives that reduce transparency in each layer (polycarbonate film, transparent conductive layer) of the multilayer body.

[0031] The surface temperature of the multilayer body of this embodiment (before and / or after heat processing) is preferably 35° C. or higher, more preferably 36° C. or higher, more preferably 37° C. or higher, even more preferably 38° C. or higher, and even more preferably 39° C. or higher, and is preferably 60° C. or lower, more preferably 55° C. or lower, even more preferably 50° C. or lower, even more preferably 45° C. or lower, and even more preferably 41.0° C. or lower. The surface temperature of the multilayer body of this embodiment is measured as described in the Examples below.

[0032] <Winding body> The multilayer body of this embodiment can be wound into a winding body. The multilayer body of this embodiment has excellent winding properties, so it can be stored and transported as a winding body. In particular, when the thickness of the polycarbonate film is 1000 μm or less, the winding properties tend to be excellent.

[0033] <Applications> The multilayer body of this embodiment is preferably used for heat bending. In particular, the multilayer body of this embodiment has the advantage of being able to maintain a moderately high surface temperature both before and after heat bending. The multilayer body of this embodiment is also preferably used as a protective film for a polarizing sheet (a multilayer body that protects a polarizing film). Specifically, in this embodiment, the polarizing sheet includes the multilayer body of this embodiment and a polarizing film. That is, the multilayer body of this embodiment is preferably used as at least one of the protective films of the polarizing sheet. The protective film is usually attached to the polarizing film via an adhesive. In this embodiment, one protective film of the polarizing sheet may be the multilayer body of this embodiment or another protective film. The other protective film of the polarizing sheet may be a known protective film for a polarizing sheet, or may be the multilayer body of this embodiment. Known polarizing films can be used, and examples thereof include a polyvinyl alcohol (PVA) multilayer body having iodine or a dichroic organic dye adsorbed or impregnated therein. The adhesive used to bond the multilayer body of this embodiment, the other protective film, and the polarizing film can be a known adhesive, such as an acrylic adhesive, a urethane adhesive, an epoxy adhesive, a silicone adhesive, or a polyvinyl alcohol adhesive. Urethane adhesives are preferred. The thickness of the adhesive is typically 1 μm or more and typically 30 μm or less. The polarizing sheet of this embodiment may further include a masking multilayer body or the like on the outer side of the multilayer body of this embodiment and the other protective film.

[0034] The polarizing sheet of this embodiment is preferably used as a heat-bent product obtained by heat bending. When the multilayer structure of this embodiment is used in a polarizing sheet, it may be provided on either side of the polarizing film, or on both sides. In a first embodiment, the multilayer structure of this embodiment is disposed so as to be located on the convex side of the polarizing film after heat bending, for example, on the side of protective film 4 in FIG. 1 . In a second embodiment, the multilayer structure of this embodiment is disposed so as to be located on the concave side of the polarizing film after heat bending, for example, on the side of protective film 3 in FIG. 1 . In a third embodiment, the multilayer structure of this embodiment is disposed on both sides of the polarizing film, for example, both protective films 3 and 4 in FIG. 1 are multilayer structures of this embodiment. Note that in FIG. 1 , the lens 1, the polarizing film 2, and the protective films 3 and 4 are bent, but it goes without saying that a polarizing sheet that has not been bent is also included in this embodiment. The protective films (the multilayer structure of this embodiment, other protective films) used in the polarizing sheet of this embodiment may or may not be stretched. In the first embodiment, stretching is preferred. In the second embodiment, it is preferably not stretched.

[0035] In this embodiment, the polarizing sheet is preferably used as a polarizing sheet for use in liquid crystal display devices, polarizing lenses (sunglasses, ski goggles, prescription eyeglass lenses, camera viewfinder lenses), covers for various instruments, glass for automobiles, glass for trains, polarizing sheets for in-vehicle display panels and electronic device housings, etc., in-vehicle inner mirrors, silver mirrors for helmets, etc., and is particularly preferably used as a polarizing lens.

[0036] The present invention will be explained in more detail below with reference to examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. If the measuring instruments used in the examples are difficult to obtain due to discontinuation or the like, measurements can be made using other instruments with equivalent performance.

[0037] 1. Raw materials The following raw materials were used: A1: Polycarbonate, S-3000N, manufactured by Mitsubishi Gas Chemical Co., Inc. A2: Polyethylene terephthalate film, thickness 250 μm, E5101, manufactured by Toyobo Co., Ltd. B1: Denatron PT-448, conductive paint using PEDOT / PSS, manufactured by Nagase ChemteX Corporation

[0038] <Production of Polycarbonate Film> The polycarbonate pellets were extruded into a molten state using a T-die melt extruder consisting of a vented twin-screw extruder (manufactured by The Japan Steel Works, Ltd., "TEX30α") ​​with a barrel diameter of 32 mm and a screw L / D of 31.5 at a discharge rate of 30 kg / h and a screw rotation speed of 300 rpm. The extruded material was pressed between a first roll and a second roll, and then cooled and solidified to produce a film. The cylinder temperature and die head temperature were set to 280°C. The final film thickness was adjusted by changing the roll speed of the second roll to obtain the value shown in Table 1. Details of the first and second rolls used are as follows. First roll: Silicone rubber roll (IT68S-MCG) manufactured by Mochida Shoko Co., Ltd. Dimensions: outer diameter 260 mm x width 600 mm Roll temperature: 50°C Second roll: Rigid metal roll (surface: hard chrome treated) manufactured by JSW Co., Ltd. Core diameter: outer diameter 250 mm x width 600 mm Roll temperature: 130°C

[0039] 2. Examples 1 to 6, Comparative Examples 1 and 2 <Production of Multilayer Body> A conductive coating material using PEDOT / PSS was applied to the polycarbonate film (thickness shown in Table 1, units are μm) or polyethylene terephthalate film obtained above using a knife coater, and dried at 130°C for 5 minutes to obtain a polycarbonate film (multilayer body) with a transparent conductive layer. The thickness of the coating film was adjusted so that the thickness of the transparent conductive layer would be the thickness shown in Table 1 (unit is μm).

[0040] <Surface Temperature> A multilayer body measuring 5 cm x 5 cm was cut out from the multilayer body obtained above, and copper plates were attached to both ends of the cut-out multilayer body using silver paste to prepare electrodes. A current of 10 V was passed between the two electrodes for 60 seconds. Thereafter, the surface temperature (unit: °C) of the transparent conductive layer side of the multilayer body under constant voltage was measured. The silver paste used was "TK Paste CN-7120" manufactured by Kaken Tech Co., Ltd.

[0041] The surface temperature of the multilayer body after heat processing (hot bending) was also measured in the same manner. Specifically, the heat processing (hot bending) was performed as follows. The heat processing involved preheating the multilayer body in a preheater so that the coated surface was facing downward, and then attaching a suction cup to the underside with a suction arm. The multilayer body was placed in a mold (metallic female mold) having a partial spherical surface of a predetermined temperature and a predetermined curvature so that the substrate (polycarbonate film) surface in the multilayer body was in contact with the mold (metallic female mold). The multilayer body was pressed against the mold (metallic female mold) by a silicone rubber male mold, and simultaneously depressurizing was initiated to attach the multilayer body to the mold (metallic female mold). The silicone rubber male mold was then lifted, and the punched piece attached to the mold (metallic female mold) was held in a hot air atmosphere at a predetermined temperature for a predetermined time. After that, a suction cup was attached to the underside of the multilayer body with the suction arm, and the multilayer body was then removed from the mold (metallic female mold). In the above, the multilayer sheet was preheated to an ambient temperature of 138°C, the mold (female metal mold) was a partial sphere with a radius of 8R (approximately 65.4 mm) and a surface temperature of 138°C, the pressing time with the male silicone rubber mold was 2 seconds, and the sheet was adsorbed to the mold (female metal mold) for 9 minutes in an atmosphere where the temperature of the blown hot air was 140°C.

[0042] <Windability> The obtained multilayer body (before heat processing) was wound around a core material with an inner diameter of 3 inches, and the windability was evaluated. The evaluation was performed visually by five experts and judged by majority vote. A: Winding was possible. B: Winding was possible, although it was somewhat difficult. C: Other than A and B, for example, winding was impossible.

[0043] <Thermoformability> The ease of heat bending when the multilayer body was heat-processed (heat bending) was evaluated as follows. The test was carried out by five experts, and the judgement was made by majority vote. A: Heat bending was possible. B: Heat bending was difficult.

[0044]

[0045] In Table 1 above, the base film "A1" and "A2" indicate the abbreviations for the types of thermoplastic resin used in the film. The numbers in the base film column indicate the thickness (unit: μm) of the base film. For example, Example 1 indicates that the thickness of the polycarbonate film, which is the base film, is 300 μm. The transparent conductive layer "B1" indicates the abbreviation for the type of paint used to form the transparent conductive layer. The number in the transparent conductive layer column indicates the thickness of the transparent conductive layer. For example, Example 1 indicates that the thickness of the transparent conductive layer is 1.0 μm.

[0046] As is clear from the above results, the multilayer body of the present invention can be hot-bent and can be maintained at an appropriate surface temperature. Furthermore, the appropriate surface temperature can be maintained even after hot-bending. Furthermore, the multilayer body also has excellent winding properties.

[0047] 1 Lens 2 Polarizing film 3 Protective film 4 Protective film

Claims

1. A multilayer body having a polycarbonate film having a thickness of 150 to 3000 μm and a transparent conductive layer, the transparent conductive layer comprising polyethylenedioxythiophene and polystyrenesulfonic acid.

2. The multi-layer body of claim 1, wherein said polycarbonate film comprises bisphenol A polycarbonate.

3. The multilayer body according to claim 1 or 2, wherein the transparent conductive layer has a thickness of 0.3 to 3 μm.

4. The multilayer body according to any one of claims 1 to 3, which is for use in hot bending processing.

5. The multilayer body according to any one of claims 1 to 4, wherein the polycarbonate film contains bisphenol A polycarbonate, the transparent conductive layer has a thickness of 0.3 to 3 μm, and the multilayer body is for use in heat bending processing.

6. A polarizing sheet comprising the multilayer body according to any one of claims 1 to 5 and a polarizing film.

7. A heat-bent product of the multilayer body according to any one of claims 1 to 5.

8. A polarizing lens comprising the polarizing sheet according to claim 6.

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