CN117295986A - Polarizing plate, polarizing lens and optical member - Google Patents
Polarizing plate, polarizing lens and optical member Download PDFInfo
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- CN117295986A CN117295986A CN202280025504.1A CN202280025504A CN117295986A CN 117295986 A CN117295986 A CN 117295986A CN 202280025504 A CN202280025504 A CN 202280025504A CN 117295986 A CN117295986 A CN 117295986A
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- polarizing plate
- polarizing
- protective sheet
- lens
- resin
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Abstract
A polarizing plate (10) of the present invention comprises a polarizing film (13), a 1 st protective sheet (11), a 2 nd protective sheet (12), a 1 st bonding layer (16), and a 2 nd bonding layer (17), wherein the 1 st bonding layer (16) is a bonding layer composed of a polyurethane-based adhesive as a main material, and is formed according to JIS K7136: 2000, the haze value of the polarizing plate (10) is measured after immersing the polarizing plate (10) in distilled water at 80 ℃ for 15 minutes, and the condition that the haze value is 0.05% or more and 1.00% or less is satisfied. The 1 st protective sheet (11) is preferably a protective sheet composed mainly of a polycarbonate resin or a polyamide resin, and the 2 nd protective sheet (12) is preferably a protective sheet composed mainly of a cellulose resin.
Description
Technical Field
The present invention relates to a polarizing plate, a polarizing lens, and an optical member.
Background
A polarizing lens including a polarizing laminate (polarizing plate) in which both surfaces of a polarizing film are covered with a coating layer made of a main material such as a polycarbonate resin or a polyamide resin has been proposed (for example, refer to patent document 1).
For example, in a state where protective films are attached to both surfaces of a polarizing laminate (polarizing plate) having a flat plate shape in a plan view, the polarizing laminate is punched out in a predetermined shape such as a circular shape in a plan view. Then, the polarizing laminate is subjected to a thermal bending process under heating to produce a polarizing plate formed into a curved plate shape by a thermal bending method. Then, after the protective film is peeled off from the polarizing plate, the polarizing plate is adsorbed to a mold having a curved plate-like concave portion so that the concave portion of the mold and the convex portion of the polarizing plate come into contact with each other, and then a resin layer (optical lens) composed mainly of a resin material such as a polycarbonate resin or a polyamide resin is formed on the concave surface of the polarizing plate by using an injection molding method.
And, depending on the application, a hard coat layer is formed as an outermost layer on at least one surface side of the polarizing lens.
In the polarizing laminate provided with such a polarizing lens, the joining of the polarizing film and the coating layer is performed via a joining layer, and in view of the transparency and joining strength, a urethane adhesive may be used for the joining layer.
However, in this case, when the polarizing lens is manufactured by applying the above-described method for manufacturing a polarizing lens, there is a problem that the transparency of the polarizing laminate is lowered after the heat bending process of the polarizing laminate (polarizing plate) under heating, the injection molding of the resin layer (optical lens), and further after the formation of the hard coat layer.
This problem, that is, the decrease in transparency of the polarizing laminate, also occurs when the sunglasses (eyeglasses) provided with the polarizing lenses are disposed in a high-temperature space such as an instrument panel in a vehicle for a long period of time.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2009-294445.
Disclosure of Invention
Problems to be solved by the invention
The purpose of the present invention is to provide a polarizing plate that can reliably suppress or prevent a decrease in transparency even when exposed to high temperatures, and to provide a polarizing lens and an optical member that have excellent reliability and are provided with the polarizing plate.
Means for solving the problems
This object is achieved by the present invention described in the following (1) to (11).
(1) A polarizing plate is provided with: a polarizing film uniaxially stretched and having an absorption axis in the direction of the uniaxial stretching; a 1 st protective sheet laminated on one surface side of the polarizing film and having birefringence; a 2 nd protective sheet laminated on the other surface side of the polarizing film and having a lower birefringence than the 1 st protective sheet; a 1 st bonding layer bonding the polarizing film and the 1 st protective sheet; and a 2 nd bonding layer for bonding the polarizing film and the 2 nd protective sheet, wherein the 1 st bonding layer is a bonding layer composed of a polyurethane-based adhesive as a main material, and is formed in accordance with JIS K7136: 2000, the haze value of the polarizing plate is 0.05% or more and 1.00% or less when the haze value of the polarizing plate is measured after immersing the polarizing plate in distilled water at 80 ℃ for 15 minutes.
(2) The polarizing plate according to the above (1), wherein the polarizing plate is produced according to JIS K7136: 2000, the adhesion force of the polarizing plate was measured after immersing the polarizing plate in distilled water at 80℃for 15 minutes, and the adhesion force satisfied the following condition A.
Condition a: the polarizing plate was cut into a size of 200mm in length by 25mm in width in accordance with JIS K6854-2, and then one end of the 1 st protective sheet of the polarizing plate was grasped at 140℃and peeled off to a length of 10mm at a speed of 10 mm/min in a direction of 180℃to satisfy the conditions of 40N/25mm to 500N/25 mm.
(3) The polarizing plate according to the above (1) or (2), wherein the polyurethane-based adhesive is of a single-liquid moisture-crosslinking type or a double-liquid crosslinking type.
(4) The polarizing plate according to any one of the above (1) to (3), wherein the 1 st protective sheet is a protective sheet comprising a polycarbonate-based resin or a polyamide-based resin as a main material, and the 2 nd protective sheet is a protective sheet comprising a cellulose-based resin as a main material.
(5) The polarizing plate according to any one of the above (1) to (4), wherein the polarizing film is composed of a polyvinyl alcohol resin or a derivative thereof as a main material, and contains a dichroic dye and is uniaxially stretched.
(6) The polarizing plate according to any one of the above (1) to (5), wherein the polarizing plate is formed in a curved plate shape such that the 1 st protective plate forms a concave surface and the 2 nd protective plate forms a convex surface, and the polarizing plate is provided in a cavity of a mold of an injection molding machine such that the convex surface side of the polarizing plate becomes a mold side of the injection molding machine and the concave surface side is exposed, and is used for forming an optical lens that is composed mainly of an optical resin for injection molding and is bonded to the 1 st protective plate by an injection molding method.
(7) A polarizing lens, comprising: the polarizing plate according to any one of (1) to (6) above, which is formed in a curved plate shape so that the 1 st protective sheet forms a concave surface and the 2 nd protective sheet forms a convex surface; and the optical lens is formed by injection molding while being joined to the 1 st protective sheet at the concave surface.
(8) The polarizing lens according to the above (7), wherein: 2000, the haze value of the polarizing lens is 0.05% or more and 1.00% or less when the haze value of the polarizing lens is measured after immersing the polarizing lens in distilled water at 80 ℃ for 15 minutes.
(9) The polarizing lens according to the above (7) or (8), wherein the concave surface of the 1 st protective sheet side of the polarizing plate faces the eye side of the user when the polarizing lens is used.
(10) The polarizing lens according to any one of the above (7) to (9), wherein in the polarizing plate provided with the polarizing lens, a difference between an arc (curve) in MD and an arc in TD is 0.05 to 0.5.
(11) An optical member comprising the polarizing lens according to any one of (7) to (10).
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, according to JIS 7136:2000, the haze value of the polarizing plate was measured after immersing the polarizing plate in distilled water at 80 ℃ for 15 minutes, and the haze value was set to 0.05% to 1.00%. Therefore, for example, in the case of performing thermal bending processing of a polarizing plate under heating or injection molding of an optical lens to produce a polarizing lens including the polarizing plate, even if the polarizing plate is exposed to high temperature, it can be said that the decrease in the transparency of the polarizing plate is reliably suppressed or prevented. Therefore, a polarizing lens and an optical component having excellent reliability can be manufactured.
Drawings
Fig. 1 is a perspective view showing an embodiment when applied to sunglasses as an optical member including a polarizing lens having a polarizing plate according to the present invention.
Fig. 2 is a schematic diagram for explaining a method of manufacturing a polarizing lens having a polarizing plate of the present invention.
Fig. 3 is a longitudinal sectional view showing an embodiment of the polarizing plate of the present invention.
Detailed Description
Hereinafter, the polarizing plate, the polarizing lens, and the optical member according to the present invention will be described in detail with reference to preferred embodiments shown in the drawings. In the present specification, the main material means a material containing 50 wt% or more of the constituent material, and for example, "the 1 st protective sheet contains a polycarbonate resin as the main material thereof" means that the polycarbonate resin contained in the 1 st protective sheet accounts for 50 wt% or more of the 1 st protective sheet, assuming that the total weight of the 1 st protective sheet is 100 wt%.
The polarizing plate 10 of the present invention comprises: a polarizing film 13; a 1 st protective sheet 11 laminated on one surface side of the polarizing film 13; a 2 nd protective sheet 12 laminated on the other surface side of the polarizing film; a 1 st bonding layer 16 bonding the polarizing film 13 and the 1 st protective sheet 11; and a 2 nd bonding layer 17 bonding the polarizing film 13 and the 2 nd protective sheet 12. The polarizing plate 10 is formed in a curved plate shape such that the 1 st protective sheet 11 forms a concave surface and the 2 nd protective sheet 12 forms a convex surface, and the polarizing plate 10 is set in a cavity of a mold 40 of an injection molding machine such that the convex surface side of the polarizing plate 10 is exposed to the side of the mold 40 and the concave surface side of the injection molding machine, so that a resin layer 35 (optical lens) composed mainly of an injection molding optical resin and bonded to the 1 st protective sheet 11 is formed by injection molding. The 1 st bonding layer 16 is composed of a polyurethane adhesive as a main material, and is formed in accordance with JIS 7136:2000, when the haze value of the polarizing plate 10 is measured after immersing the polarizing plate 10 in distilled water at 80 ℃ for 15 minutes, the condition that the haze value is 0.05% or more and 1.00% or less is satisfied.
Therefore, for example, in the case of manufacturing the polarizing lens 30 including the polarizing plate 10, as in the case of performing thermal bending processing of the polarizing plate 10 under heating or injection molding of the resin layer 35 (optical lens) on the polarizing plate 10, it can be said that the decrease in the transparency of the polarizing plate 10 is surely suppressed or prevented even when the polarizing plate 10 is exposed to high temperature. Therefore, the polarized lens 30 having excellent reliability and the sunglasses 100 as the optical member can be manufactured.
The polarizing plate 10 of the present invention is used as, for example, a resin substrate having polarization properties of the polarizing lens 30 provided in the sunglasses 100, which are one type of glasses as an optical member. Therefore, before explaining the polarizing plate 10 of the present invention, the sunglasses 100 (optical members of the present invention) will be described below.
< sunglasses >
Fig. 1 is a perspective view showing an embodiment when applied to sunglasses as an optical member including a polarizing lens having a polarizing plate according to the present invention. In fig. 1, when the sunglasses are worn on the head of a user, the surface on the eye side of the user of the lens is referred to as a back surface side surface, and the surface on the opposite side is referred to as a front surface side surface.
As shown in fig. 1, the sunglasses 100 include a frame 20 and a polarizing lens 30 (polarizing lens of the present invention).
In addition, in the present specification, the "polarization lens" includes both a polarization lens having a condensing function and a polarization lens not having a condensing function.
The lens frame 20 is worn on the head of a user, and is a member for disposing the polarization lens 30 in the vicinity of the front of the eyes of the user.
The frame 20 includes a frame portion (rim) 21, a bridge portion 22, a temple portion 23, and a nose pad portion 24.
The frame 21 is annular, and has one polarizing lens 30 mounted therein corresponding to each of the right eye and the left eye. Thus, the user can visually recognize external information through the polarization lens 30.
The bridge 22 is rod-shaped and is positioned in front of the upper part of the nose of the user when worn on the head of the user, and connects the pair of frame parts 21.
The temple portion 23 is in the shape of a vine and is connected to an edge portion on the opposite side of the position where the bridge portion 22 of each frame portion 21 is connected. The temple portion 23 is hung on the user's ear when worn on the user's head.
When the sunglasses 100 are worn on the head of a user, the nose pad portions 24 are provided at the edge portions of the respective frame portions 21 corresponding to the nose of the user and are brought into contact with the nose of the user, and at this time, are shaped to correspond to the contact portions of the nose of the user. This enables the wearing state to be stably maintained.
The constituent materials of the respective portions constituting the frame 20 are not particularly limited, and various metal materials, various resin materials, and the like can be used, for example. The shape of the frame 20 is not limited to the shape shown in the drawings as long as it can be worn on the head of the user.
The polarization lenses 30 are attached to the respective frame portions 21. The polarizing lens 30 has light transmittance, and is a plate-like member curved outward, that is, a member having a curved convex surface facing outward and a concave surface facing the eye of the user, and includes a polarizing plate 10 and a resin layer 35 bonded to the polarizing plate 10.
The resin layer 35 has light transmittance, is located on the back surface side of the polarizing lens 30, functions as an optical lens, and has a light condensing function when the light condensing function is provided to the polarizing lens 30.
The constituent material of the main material constituting the resin layer 35 (optical lens) is not particularly limited as long as it is a resin material (optical resin for injection molding) having light transmittance and capable of forming the resin layer 35 by injection molding as described in the method for producing the polarizing lens 30 described later, and examples thereof include various curable resins such as various thermoplastic resins, thermosetting resins, and photocurable resins, and 1 or 2 or more of them may be used in combination.
Examples of the resin material (optical resin for injection molding) include polyolefin such as polyethylene, polypropylene, and ethylene-propylene copolymer; polyesters such AS polyvinyl chloride, polystyrene, polyamide, polyimide, polycarbonate, poly- (4-methylpentene-1), ionomer, acrylic resin, polymethyl methacrylate, acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-styrene copolymer (AS resin), butadiene-styrene copolymer, polyethylene terephthalate (PET), polybutylene terephthalate (PBT); polyether, polyether ketone (PEK), polyether ether ketone (PEEK), polyether imide, polyacetal (POM), polyphenylene oxide, polysulfone, polyether sulfone, polyphenylene sulfide, polyarylate, aromatic polyester (liquid crystal polymer), polytetrafluoroethylene, polyvinylidene fluoride, and other fluorine-based resins; among them, the same or the same resin material as the 1 st protective sheet 11 included in the polarizing plate 10 described later is preferable, and among them, epoxy resin, phenolic resin, urea resin, melamine resin, silicone resin, polyurethane, and the like, or a copolymer, blend, polymer alloy, and the like based on them are preferable. This can exert excellent adhesion between the resin layer 35 and the polarizing plate 10, and thus can reliably suppress or prevent the resin layer 35 from being detached from the polarizing plate 10.
The thickness of the resin layer 35 is not particularly limited, and is preferably, for example, 0.5mm to 5.0mm, more preferably 1.0mm to 3.0 mm. This makes it possible to achieve both relatively high strength and weight reduction of the polarization lens 30.
The polarizing plate 10 is a polarizing resin substrate bonded to the curved convex surface, which is the outer surface of the resin layer 35, after being subjected to a thermal bending process in accordance with the shape of the resin layer, and thereby imparts polarization to the sunglasses 100. As a result, the sunglasses 100 function as polarized sunglasses having polarization properties. The polarizing plate 10 is constituted by the polarizing plate of the present invention, and a detailed description thereof will be given later.
As described above, the polarization lens 30 included in the sunglasses 100 may be any one of a polarization lens having a condensing function and a polarization lens not having a condensing function.
As described above, the sunglasses 100 may have not only the structure having the frame 20 but also the structure having no frame from the viewpoints of fashion and lightweight.
In the present embodiment, the optical component of the present invention is applied to the sunglasses 100, but the optical component of the present invention is not limited to this, and may be, for example, glasses such as glasses with power and ida glasses (decorative glasses), goggles for protecting eyes from wind, rain, dust, medicines, etc., face masks, sun visors, goggles for smart glasses, and the like.
In the sunglasses 100 having the above-described configuration, the polarizing lens 30 (polarizing lens of the present invention) included in the sunglasses 100 is manufactured by the following method for manufacturing the polarizing lens 30.
Method for producing polarizing lens
Fig. 2 is a schematic diagram for explaining a method of manufacturing a polarizing lens having a polarizing plate of the present invention. For convenience of explanation, the upper side of fig. 1 will be referred to as "upper" and the lower side will be referred to as "lower".
Hereinafter, each step of the method for manufacturing the polarizing lens 30 including the polarizing plate 10 of the present invention will be described in detail.
[1] First, a polarizing plate 10 having a flat plate shape as a whole, which is formed by laminating a 1 st protective sheet 11, a polarizing film 13, and a 2 nd protective sheet 12 in this order, is prepared. Then, protective films 50 (masking tapes) are attached to both surfaces of the polarizing plate 10, and a multilayer laminate 200 (see fig. 1 a) having the protective films 50 attached to both surfaces of the polarizing plate 10 is obtained.
[2] Next, as shown in fig. 1 (b), the prepared multilayer laminate 200, that is, the protective film 50 is stuck to both surfaces of the polarizing plate 10, and the polarizing plate 10 is punched out in the thickness direction thereof, so that the multilayer laminate 200 is circular in plan view.
[3] Next, as shown in fig. 1 (c), the circular multilayer laminate 200 is subjected to a thermal bending process under heating.
Thus, the multilayer laminate 200 is formed into a curved plate shape (curved plate shape) in which the 1 st protective sheet 11 side is a curved concave surface (concave surface) and the 2 nd protective sheet 12 side is a curved convex surface (convex surface). As a result, the polarizing plate 10 has a curved plate shape in which the 1 st protective sheet 11 side forms a curved concave surface (concave surface) and the 2 nd protective sheet 12 side forms a curved convex surface (convex surface) in a state where the protective films 50 are attached to both surfaces.
Further, by subjecting the multilayer laminate 200 to a heat bending process, the difference between the curvature in the MD and the curvature in the TD of the polarizing plate 10 is preferably set to 0.05 or more and 0.5 or less, and more preferably set to 0.05 or more and 0.2 or less.
The hot bending process is typically performed by press forming or vacuum forming.
As described above, in the present embodiment, the polarizing plate 10 includes the protective sheet 11 and the protective sheet 12, and in consideration of the melting or softening temperatures of the protective sheet 11 and the protective sheet 12, the heating temperature (molding temperature) of the multilayer laminate 200 (polarizing plate 10) at this time is preferably set to be about 110 ℃ or higher and 170 ℃ or lower, more preferably 140 ℃ or higher and 160 ℃ or lower. By setting the heating temperature within this range, deterioration and degradation of the polarizing plate 10 are prevented, and the polarizing plate 10 is brought into a softened or molten state, whereby the polarizing plate 10 is reliably thermally bent, and for example, the polarizing plate 10 having a bent plate shape in which the difference between the curvature in MD and the curvature in TD is set within the above range can be produced.
It is preferable that the drying step of drying the multilayer laminate 200 is performed in advance before the thermal bending process in the present step [3 ]. As a result, the deformation of the polarizing plate 10 due to moisture absorption can be reliably suppressed or prevented, and therefore the thermal bending process of the multilayer laminate 200, that is, the thermal bending process of the polarizing plate 10 in a state where the protective films 50 are attached to both surfaces can be performed with excellent accuracy. The drying of the multilayer laminate 200 can be performed by, for example, blowing hot air at a temperature of 70 ℃ or higher and 80 ℃ or lower on the surface of the multilayer laminate 200 for a time of 5 hours or higher and 15 hours or lower.
[4] Next, the protective film 50 is peeled from the multilayer laminate 200, which is the polarizer 10 subjected to thermal bending. Then, as shown in fig. 2 (d), the polarizing plate 10 is sucked onto the mold 40 of the injection molding machine having the curved concave surface of the curved plate shape so that the curved concave surface of the mold 40 is brought into contact with the 2 nd protective sheet 12 side which is the curved convex surface of the polarizing plate 10. Thus, the polarizing plate 10 is set in the cavity 401 of the mold 40 in a state where the curved concave surface of the polarizing plate 10, i.e., the 1 st protective sheet 11 side is exposed. Then, in this state, the resin layer 35 made of a resin material is injection molded on the curved concave surface (the 1 st protective sheet 11) of the polarizing plate 10 using an insert injection molding method (injection molding method). Thus, the polarizing lens 30 having the thermally curved polarizing plate 10 and the resin layer 35 (optical lens) was produced.
In addition, in the insert injection molding method, an injection compression molding method is preferably used. The injection compression molding method is a method in which a resin material (optical resin for injection molding) for forming the resin layer 35 is injected into the mold 40 at a low pressure, and then the mold 40 is closed at a high pressure and a compressive force is applied to the resin material, and therefore, optical anisotropy due to local orientation of resin molecules at the time of molding deformation or molding is hardly generated in the resin layer 35 or the polarized lens 30 as a molded body, and thus, is preferably used. Further, by controlling the mold compression force uniformly applied to the resin material, the resin material can be cooled at a constant specific volume, and therefore, the resin layer 35 with high dimensional accuracy can be obtained.
It is preferable that a drying step of drying the thermally bent polarizing plate 10 is performed before the resin layer 35 is formed in the step [4 ]. Thus, deformation due to moisture absorption of the thermally curved polarizing plate 10 can be reliably suppressed or prevented, and thus the thermally curved polarizing plate 10 can be molded with excellent accuracy into the resin layer 35. Therefore, the polarizing lens 30 including the polarizing plate 10 and the resin layer 35 can be obtained with higher dimensional accuracy. The polarizer 10 can be dried by, for example, blowing hot air at 75 ℃ or higher and 85 ℃ or lower on the surface of the polarizer 10 for 15 minutes or longer and 2 hours or shorter.
Depending on the application, a hard coat layer may be provided as an outermost layer on at least one surface side of the polarizing lens 30. The hard coat layer can be formed by, for example, applying a thermosetting resin composition to the surface of the polarizing lens 30, and then heating and drying the composition. In this case, the resin composition can be heated and dried by, for example, blowing hot air at 100 ℃ or higher and 130 ℃ or lower on the surface of the polarizing plate 10 for a period of time of 1 hour or higher and 3 hours or lower.
As the polarizing plate 10 used in the method for producing the polarizing lens 30 described above, the polarizing plate of the present invention is used, and thus, the polarizing plate is used in accordance with JIS K7136: 2000, when the haze value of the polarizing plate 10 is measured after immersing the polarizing plate 10 in distilled water at 80 ℃ for 15 minutes, the condition that the haze value is 0.05% or more and 1.00% or less is satisfied. Therefore, in the case of manufacturing the polarizing lens 30 including the polarizing plate 10, it can be said that the decrease in the transparency of the polarizing plate 10 is reliably suppressed or prevented even if the polarizing plate 10 is subjected to the thermal bending process of the polarizing plate 10 under heating or the injection molding of the resin layer 35 (optical lens). Hereinafter, the polarizing plate of the present invention will be described in detail.
< polarizer 10 >)
The polarizing plate 10 (polarizing plate of the present invention) is a polarizing laminate, and includes: a polarizing film 13; a 1 st protective sheet 11 laminated on one surface side of the polarizing film 13; a 2 nd protective sheet 12 laminated on the other surface side of the polarizing film; a 1 st bonding layer 16 bonding the polarizing film 13 and the 1 st protective sheet 11; and a 2 nd bonding layer 17 bonding the polarizing film 13 and the 2 nd protective sheet 12. Hereinafter, each portion (each layer) constituting the polarizing plate 10 will be described.
Fig. 3 is a longitudinal sectional view showing an embodiment of the polarizing plate of the present invention. For convenience of explanation, the upper side of fig. 1 will be referred to as "upper" and the lower side will be referred to as "lower".
(polarizing film 13)
The polarizing film 13 is uniaxially stretched and has an absorption axis in the direction of the uniaxial stretching, and thus has a function of taking out linearly polarized light having a polarization plane in the direction of the uniaxial stretching from incident light (unpolarized natural light). Thus, the light passing through the polarizing plate 10 becomes polarized light.
The polarization degree of the polarizing film 13 is not particularly limited, and is preferably 50% or more and 100% or less, more preferably 80% or more and 100% or less, for example. The visible light transmittance of the polarizing film 13 is not particularly limited, and is preferably, for example, 10% or more and 80% or less, and more preferably, 20% or more and 50% or less.
The constituent material of the polarizing film 13 is not particularly limited as long as it has the above-mentioned function, and examples thereof include polyvinyl alcohol (PVA), partially formalized polyvinyl alcohol, polyvinyl butyral, polycarbonate, ethylene-vinyl acetate copolymer partially saponified product, and the like, and examples of the polarizing film 13 include a film (film) obtained by dyeing a polymer film made of the constituent material by adsorbing a dichroic substance such as iodine or a dichroic dye, and uniaxially stretching the film.
Among them, the polarizing film 13 is preferably a film obtained by uniaxially stretching a polymer film mainly composed of polyvinyl alcohol (PVA) by adsorbing iodine or a dichroic dye and dyeing the film. Polyvinyl alcohol (PVA) is a material excellent in transparency, heat resistance, affinity with iodine or a dichroic dye as a coloring agent, and orientation during stretching. Therefore, the polarizing film 13 based on PVA is excellent in heat resistance and polarizing ability.
Examples of the dichroic dye include chloranil fast red (Chlorantine Fast Red), congo red, brilliant Blue 6B, benzored violet (benzopurline), chlorazol black BH, direct Blue 2B (Direct Blue 2B), diamine green, direct yellow (chrysophen), siren yellow, direct red, and acid black.
The thickness of the polarizing film 13 is not particularly limited, and is preferably 5 μm or more and 60 μm or less, more preferably 10 μm or more and 40 μm or less, for example.
(1 st protective sheet 11)
The 1 st protective sheet 11 is a resin layer having birefringence, and as shown in fig. 2 (d) and 3, is laminated on the lower surface side (one surface side) of the polarizing film 13, that is, on the side that becomes a curved concave surface (concave surface), thereby functioning as a protective layer that protects the lower surface side of the polarizing film 13.
The 1 st protective sheet 11 is not particularly limited as long as it has birefringence, and is composed of, for example, a resin material such as a polyamide resin and a polycarbonate resin as a main material, and 1 or 2 or more of these resin materials may be used in combination. The 1 st protective sheet 11 is formed of at least one of a polyamide resin and a polycarbonate resin as a main material, and the 1 st protective sheet 11 has relatively high birefringence.
Since the polycarbonate resin is rich in mechanical strength such as transparency (light transmittance) and rigidity, the transparency and impact resistance of the polarizing plate 10 can be improved. Further, since the specific gravity of the polycarbonate resin is about 1.2, the resin material is classified into a light type, and therefore, the weight of the polarizing plate 10 can be reduced. In addition to transparency and impact resistance, the polyamide resin can also realize chemical resistance, stress resistance, and the like.
The polyamide resin is not particularly limited, and various polyamide resins can be used, and examples thereof include alicyclic polyamides and semiaromatic polyamides. Alicyclic polyamide is a material excellent in impact resistance. Therefore, the polarizing plate 10 can exhibit excellent impact resistance. The semiaromatic polyamide is a material having a high elastic modulus. Therefore, the polarizing plate 10 having excellent resistance to stress such as bending can be manufactured.
In the present specification, a semiaromatic polyamide refers to a polyamide in which one of dicarboxylic acid and diamine, which are monomers constituting the polyamide, is an aromatic compound and the other is an aliphatic compound, and specifically, the semiaromatic polyamide can be represented by the following formula (1B).
(wherein R in formula (1B) 1 R is R 2 One of them is a 2-valent aromatic substituent, the other is a 2-valent aliphatic substituent, and n is an integer of 2 or more. )
The polyamide may be a copolymer (random copolymer, block copolymer, etc.) containing 2 or more monomers for at least one of dicarboxylic acid and diamine.
And R in the above formula (1B) 1 、R 2 The aromatic substituent in (a) is preferably a substituent represented by the following formula (2B).
(wherein, in the formula (2B), l and m are each independently an integer of 0 to 2 inclusive.)
This can protect the polarizing film 13 better and the polarizer 10 is more excellent in processability. In addition, when a delay is given to the 1 st protective sheet 11, delay control by stretching of the 1 st protective sheet 11 can be more easily performed.
R in the above formula (1B) 1 、R 2 The aliphatic substituent in (a) is preferably a hydrocarbon group having 4 to 18 carbon atoms, more preferably 4 to 18 carbon atoms, and still more preferably a saturated hydrocarbon group having 4 to 18 carbon atoms.
Thus, the processability of the polarizing plate 10 is more excellent.
The semiaromatic polyamide preferably contains an aromatic dicarboxylic acid and an aliphatic diamine as constituent monomers. This can protect the polarizing film 13 better and the polarizer 10 is more excellent in processability. Further, delay control by stretching can be performed more easily.
The alicyclic polyamide has an alicyclic chemical structure in its molecule, and may have an alicyclic chemical structure in its main chain structure or may have an alicyclic chemical structure in its side chain structure.
Examples of the alicyclic polyamide include a compound having an alicyclic chemical structure in at least one of a dicarboxylic acid and a diamine, which are monomers constituting the polyamide, and the like, and specifically, the alicyclic polyamide is represented by the following formula (3B).
(wherein, in the formula (3B), R 3 、R 4 Each independently represents a hydrogen atom or a hydrocarbon group having 4 or less carbon atoms, o represents an integer of 2 or more and 14 or less, p represents an integer of 0 or more and 6 or less, and n represents an integer of 2 or more. )
The polycarbonate resin is not particularly limited, and various polycarbonate resins can be used, and among them, aromatic polycarbonate resins are preferable. The aromatic polycarbonate resin has an aromatic ring in its main chain, and thus the polarizer 10 is more excellent in strength.
The aromatic polycarbonate resin is synthesized, for example, by interfacial polycondensation of bisphenol and phosgene, transesterification of bisphenol and diphenyl carbonate, or the like.
Examples of the bisphenol include bisphenol a, bisphenol (modified bisphenol) which is the origin of a repeating unit of the polycarbonate represented by the following formula (1A), and the like.
(in the formula (1A), X is an alkyl group having 1 to 18 carbon atoms, an aromatic group or a cyclic aliphatic group, ra and Rb are each independently an alkyl group having 1 to 12 carbon atoms, m and n are each an integer of 0 to 4, and p is the number of repeating units.)
Specific examples of bisphenols which are the origin of the repeating units of the polycarbonate represented by the above formula (1A) include 4,4'- (pentane-2, 2-diyl) diphenol, 4' - (pentane-3, 3-diyl) diphenol, 4'- (butane-2, 2-diyl) diphenol, 1' - (cyclohexanediyl) diphenol, 2-cyclohexyl-1, 4-bis (4-hydroxyphenyl) benzene, 2, 3-dicyclohexyl-1, 4-bis (4-hydroxyphenyl) benzene, 1 '-bis (4-hydroxy-3-methylphenyl) cyclohexane, 2' -bis (4-hydroxy-3-methylphenyl) propane, and the like, and one or more of them may be used in combination.
In particular, the polycarbonate resin may contain a bisphenol type polycarbonate resin having a bisphenol-derived skeleton, and preferably contains a bisphenol type polycarbonate resin having a bisphenol-derived skeleton as a main component. By using the bisphenol type polycarbonate resin, the polarizer 10 exhibits more excellent strength.
The glass transition temperature (Tg) of the resin material contained as the main material in the 1 st protective sheet 11 is preferably 100 ℃ or more and 190 ℃ or less, more preferably 105 ℃ or more and 155 ℃ or less. This makes it possible to relatively easily perform the thermal bending process of the polarizing plate 10 in the step [3 ]. When the 1 st protective sheet 11 is made to exhibit a retardation, stretching for exhibiting the retardation can be appropriately performed. Further, the durability and reliability of the polarizing plate 10 can be further improved.
The 1 st protective sheet 11 may contain other components in addition to the resin material contained as the main material. Examples of such components include, but are not particularly limited to, colorants such as resin materials and dyes other than the main material, fillers, orientation aids, stabilizers (heat stabilizers, ultraviolet absorbers, antioxidants, and the like), plasticizers, colorants, flame retardants, antistatic agents, viscosity modifiers, and the like.
In this case, the content of the resin material in the 1 st protective sheet 11 is not particularly limited, but is preferably 75 parts by mass or more, more preferably 85 parts by mass or more, of 100 parts by mass of the 1 st protective sheet 11. By setting the content of the resin material within the above range, the polarizer 10 can exhibit excellent strength.
In order to cause the 1 st protective sheet 11 to exhibit a delay, the delay of the 1 st protective sheet 11 is preferably set relatively low.
This makes it difficult for the 1 st protective sheet 11 to deform due to heat shrinkage. Therefore, as shown in fig. 2 and 3, when the polarizing plate 10 provided in the polarizing lens 30 is applied to the polarizing plate 10 in a curved state as described above, the 1 st protective sheet 11 is positioned on the curved concave side in this case, and excessive deformation due to heat can be prevented as a whole of the polarizing plate 10. As a result, the shape deformation of the polarizing lens 30 itself due to the thermal deformation of the polarizing plate 10 can be reliably suppressed or prevented.
The retardation of the 1 st protective sheet 11 is preferably 0nm or more and 500nm or less, more preferably 50nm or more and 350nm or less. This can fully exert the polarizing performance of the polarizing plate 10. In addition, as described above, when the curvature in MD and the curvature in TD of the polarizing plate 10 are different, the deviation in the curvature can be reliably suppressed or prevented from occurring due to the heat shrinkage of the 1 st protective sheet 11.
The retardation of the 1 st protective sheet 11 can be varied by varying the constituent material, the thickness, the stretch ratio, and the like contained in the layer.
The average thickness of the 1 st protective sheet 11 is not particularly limited, and is preferably, for example, 0.05mm to 0.5mm, and preferably, 0.1mm to 0.4 mm.
The stretch ratio of the 1 st protective sheet 11 is not particularly limited, but is preferably, for example, 0.95 to 1.1 as long as the retardation is set.
It is preferable that the 1 st protective sheet 11 and the polarizing film 13 have the same stretching direction. This can further improve the polarizing performance of the polarizing plate 10.
(2 nd protective sheet 12)
The 2 nd protective sheet 12 is a resin layer having a lower birefringence than the 1 st protective sheet 11, and is laminated on the upper surface side (other surface side) of the polarizing film 13, that is, on the side of the curved convex surface (convex surface), as shown in fig. 2 (d) and 3, thereby functioning as a protective layer for protecting the upper surface side of the polarizing film 13.
The 2 nd protective sheet 12 is not particularly limited as long as it has lower birefringence than the 1 st protective sheet 11, and for example, as described above, in the case where the 1 st protective sheet 11 is made of a resin material such as polyamide resin or polycarbonate resin as a main material, the 2 nd protective sheet 12 is made of a resin material such as cellulose resin as a main material. By forming the 2 nd protective sheet 12 composed of a cellulose-based resin as a main material, the 2 nd protective sheet 12 reliably has lower birefringence than the 1 st protective sheet 11.
The cellulose-based resin is not particularly limited, and various cellulose-based resins can be used, and examples thereof include cellulose esters such as triacetyl cellulose, cellulose acetate butyrate and cellulose acetate propionate; alkyl celluloses such as methyl cellulose and ethyl cellulose; hydroxyalkyl celluloses such as hydroxypropyl cellulose; aralkyl celluloses such as benzyl cellulose; cyanoalkyl celluloses such as cyanoethyl cellulose; carboxyalkyl celluloses such as carboxyethyl cellulose; amino alkyl cellulose such as amino ethyl cellulose and the like may be used in combination of 1 or 2 or more of them. Among them, cellulose esters are preferable, and triacetyl cellulose is particularly preferable. Cellulose esters (especially triacetyl cellulose) are preferably used as the main material of the 2 nd protective sheet 12 constituting the curved convex surface of the polarizing plate 10, i.e., the surface on the opposite side of the resin layer 35, because of low birefringence, high transparency, and excellent surface appearance.
The glass transition temperature (Tg) of the resin material contained as the main material in the 2 nd protective sheet 12 is preferably 100 ℃ or more and 190 ℃ or less, more preferably 105 ℃ or more and 155 ℃ or less, as in the 1 st protective sheet 11. This makes it possible to relatively easily perform the thermal bending process of the polarizing plate 10 in the step [3 ]. Further, the durability and reliability of the polarizing plate 10 are further improved.
The 2 nd protective sheet 12 may contain other components in addition to the resin material contained as the main material. Examples of such components include, but are not particularly limited to, colorants such as resin materials and dyes other than the main material, fillers, orientation aids, stabilizers (heat stabilizers, ultraviolet absorbers, antioxidants, and the like), plasticizers, colorants, flame retardants, antistatic agents, viscosity modifiers, and the like.
In this case, the content of the resin material in the 2 nd protective sheet 12 is not particularly limited, but is preferably 75 parts by mass or more, more preferably 85 parts by mass or more, of 100 parts by mass of the 2 nd protective sheet 12. By setting the content of the resin material within the above range, the polarizer 10 can exhibit excellent strength.
The average thickness of the 2 nd protective sheet 12 is not particularly limited, and is preferably, for example, 0.05mm to 0.5mm, and preferably, 0.1mm to 0.4 mm.
(1 st bonding layer 16)
The 1 st bonding layer 16 (1 st adhesive layer) has a function of bonding the polarizing film 13 and the 1 st protective sheet 11, whereby the durability of the polarizing plate 10 can be improved.
As the adhesive (or adhesive) constituting the 1 st bonding layer 16, a urethane adhesive is used in the present invention. This further improves the transparency, adhesive strength, and durability of the 1 st bonding layer 16, and particularly improves the following property with respect to the shape change of the 1 st bonding layer 16. Therefore, in the present invention, as the adhesive constituting the 1 st bonding layer 16, a urethane adhesive is used.
In order to function as an adhesive, the urethane adhesive contains a polyisocyanate compound having an isocyanate group as a constituent material thereof. When the isocyanate group reacts with water such as air, carbon dioxide is generated via carbamic acid, and an amino group is formed.
As described above, the 1 st protective sheet 11 has birefringence, and particularly when it is composed of a resin material such as a polyamide resin or a polycarbonate resin as a main material, the 1 st protective sheet 11 exhibits excellent gas barrier properties.
In this way, when the 1 st protective sheet 11 exhibits excellent gas barrier properties, carbon dioxide generated in the 1 st bonding layer 16 remains in the 1 st bonding layer 16, and thus bubbles are generated in the 1 st bonding layer 16. Further, this generation of bubbles causes a problem that the transparency of the 1 st protective sheet 11 is lowered. In particular, in the above-described method for producing a polarizing lens, for example, as in the case of thermal bending processing or injection molding accompanied by heat treatment, the occurrence of such bubbles can be frequently confirmed when the polarizing plate is exposed to high temperatures. It is clear from the study of the present inventors that this is caused by carbon dioxide generated by the reaction of the isocyanate group remaining in the 1 st bonding layer 16, which is derived from the isocyanate compound, with water such as air during the heat treatment.
In contrast, in the present invention, the method is carried out in accordance with JIS K7136: 2000, the haze value of the polarizing plate 10 was measured after immersing the polarizing plate 10 in distilled water at 80 ℃ for 15 minutes, and the condition that the haze value was 0.05% or more and 1.00% or less was satisfied. In this way, in the present invention, the condition that the haze value is 0.05% or more and 1.00% or less is satisfied, and it can be said that the decrease in the transparency of the 1 st protective sheet 11 caused by the exposure to high temperature as in the heat treatment can be reliably suppressed, and the occurrence of bubbles in the 1 st bonding layer 16 provided in the polarizing plate 10 can be reliably suppressed or prevented.
In addition, according to the type of urethane-based adhesive contained in the 1 st bonding layer 16, that is, in the case where the urethane-based adhesive is of a two-liquid crosslinked type or a one-liquid moisture crosslinked type, for example, the occurrence of bubbles in the 1 st bonding layer 16 can be suppressed as follows.
That is, when the urethane-based adhesive is a biliquid cross-linked urethane-based adhesive containing a polyisocyanate compound and a polyol, the polyisocyanate compound reacts with the polyol to form a urethane bond therebetween, whereby the adhesive is cured. In this biliquid cross-linked urethane adhesive, it is generally assumed that the polyisocyanate compound is deactivated by reaction with moisture in the air or the like, and the polyisocyanate compound is contained in the adhesive in about 1.2 times equivalent amount of the functional group relative to the polyol. However, if the polyisocyanate compound is contained in the urethane adhesive in such a large amount in equivalent amount to the functional group of the polyol, there is a tendency that unreacted isocyanate groups remain in the joint layer formed by the urethane adhesive. Therefore, when the polarizing plate having such a bonding layer is exposed to high temperature, bubbles due to the generation of carbon dioxide are generated in the bonding layer, as in the case of performing thermal bending processing or injection molding with heat treatment on the polarizing plate. In contrast, in the present invention, the polyisocyanate compound is contained in the adhesive in about 1.0 times the equivalent of the functional group, that is, in the same equivalent of the functional group, with respect to the polyol, so that the unreacted isocyanate groups are prevented from remaining in the 1 st bonding layer 16. Therefore, as in the case of the thermal bending process or the injection molding accompanied by the heat treatment, the generation of bubbles in the 1 st bonding layer 16 can be surely suppressed even if the polarizing plate 10 is exposed to a high temperature. Therefore, the haze value can be set in a range of 0.05% to 1.00%.
When the urethane-based adhesive is a single-liquid moisture-crosslinking urethane-based adhesive containing a polyisocyanate compound which is a polyisocyanate compound and contains no polyol, the diisocyanate at both ends reacts with water such as air to produce carbon dioxide and an amino-containing compound having an amino group. The other two terminal diisocyanates then react with the amino group containing compound to form urea linkages therebetween, whereby the adhesive cures. In this way, in the single-liquid moisture-crosslinking urethane-based adhesive, carbon dioxide is generally generated by reacting the diisocyanate at both ends with water. Therefore, when the polarizer is exposed to high temperature, as in the case of performing thermal bending processing or injection molding with heat treatment on the polarizer having the joining layer derived from such a single-liquid moisture-crosslinking urethane-based adhesive, the diisocyanate remaining at both ends in the joining layer reacts with water, and bubbles due to the generation of carbon dioxide are generated in the joining layer. In contrast, in the present invention, the 1 st joining layer 16 is configured to contain a trifunctional isocyanate in addition to the two-terminal diisocyanate. Thus, in the 1 st bonding layer 16, a compound having a six-membered ring is formed by the reaction of 3 isocyanate groups, and the reaction between the diisocyanate at both ends and water is hindered. Therefore, as in the case of the thermal bending process or the injection molding accompanied by the heat treatment, the generation of bubbles in the 1 st bonding layer 16 can be surely suppressed even if the polarizing plate 10 is exposed to a high temperature. As a result, the haze value can be set in a range of 0.05% to 1.00%.
In addition, according to JIS K7136:2000, when the haze value of the polarizing plate 10 is measured after immersing the polarizing plate 10 in distilled water at 80 ℃ for 15 minutes, the haze value is preferably 0.05% to 1.00%, more preferably 0.05% to 0.50%, although the haze value is preferably 0.05% to 0.20%. This can be said to more surely suppress or prevent the generation of bubbles in the 1 st bonding layer 16 provided in the polarizing plate 10.
Further, in the polarizing lens 30 including the polarizing plate 10 satisfying such haze value, the haze value is adjusted according to JIS K7136:2000, the haze value of the polarizing lens 30 is preferably 0.05% or more and 1.00% or less, more preferably 0.05% or more and 0.50% or less, when the haze value of the polarizing lens 30 is measured after immersing the polarizing lens 30 in distilled water at 80 ℃ for 15 minutes. This can be said to more surely suppress or prevent the generation of bubbles in the 1 st bonding layer 16 of the polarizing plate 10 of the polarizing lens 30.
Further, the polarizing plate 10 was prepared according to JIS K7136:2000, when the adhesion force of the polarizing plate 10 is measured after immersing the polarizing plate in distilled water at 80 ℃ for 15 minutes, the adhesion force preferably satisfies the following condition a.
Specifically, in the polarizing plate 10, the adhesive force of the 1 st protective sheet 11 to the polarizing film 13, which is measured when the polarizing plate 10 is cut into a length of 200mm by 25mm in width in accordance with JIS K6854-2 and then one end of the 1 st protective sheet 11 of the polarizing plate 10 is grasped in an environment of 140℃and peeled at a speed of 10 mm/min in a direction of 180℃to a length of 10mm, is preferably 40N/25mm or more and 500N/25mm or less, more preferably 50N/25mm or more and 300N/25mm or less, still more preferably 80N/25mm or more and 250N/25mm or less (element A).
When bubbles are generated in the polarizing plate 10, the transparency of the polarizing plate 10 tends to be lowered, and the adhesive force of the 1 st bonding layer 16 tends to be lowered as described above. In contrast, in the present invention, since it is relatively easy to satisfy the requirement a for the polarizing plate 10, it is possible to reliably suppress or prevent occurrence of cracks in the polarizing plate 10 and to reliably suppress or prevent the adhesive force of the 1 st bonding layer 16 from decreasing when the thermal bending process or the injection molding is performed with the heat treatment. Therefore, it can be said that the generation of bubbles in the 1 st bonding layer 16 is surely suppressed.
The thickness of the 1 st bonding layer 16 is not particularly limited, and is preferably 5 μm or more and 60 μm or less, more preferably 10 μm or more and 40 μm or less, for example. This can reliably impart the function as the 1 st bonding layer 16.
(2 nd bonding layer 17)
The 2 nd bonding layer 17 (2 nd adhesive layer) has a function of bonding the polarizing film 13 and the 2 nd protective sheet 12, whereby the durability of the polarizing plate 10 can be improved.
The adhesive (or adhesive) constituting the 2 nd bonding layer 17 is not particularly limited, and examples thereof include water-soluble adhesives such as acrylic adhesives, urethane adhesives, epoxy adhesives, silicone adhesives, and polyvinyl alcohol adhesives. Among them, urethane adhesives are preferable. This further improves the transparency, adhesive strength, and durability of the 2 nd bonding layer 17, and is particularly excellent in the following property to the shape change.
As described above, the 2 nd protective sheet 12 has lower birefringence than the 1 st protective sheet 11, and if it is made of a resin material such as cellulose ester (especially triacetyl cellulose) as a main material, the 2 nd protective sheet 12 exhibits excellent air permeability. Therefore, even if a urethane-based adhesive is used as the adhesive constituting the 2 nd bonding layer 17 and carbon dioxide is generated in the 2 nd bonding layer 17, the carbon dioxide can be discharged to the outside of the polarizing plate 10 through the 2 nd protective sheet 12. Therefore, the generation of bubbles in the 2 nd bonding layer 17 can be surely suppressed or prevented. However, from the viewpoint of more reliably preventing the occurrence of bubbles in the 2 nd bonding layer 17, when a urethane-based adhesive is used as the adhesive constituting the 2 nd bonding layer 17, it is preferable to use the same or the same kind of urethane-based adhesive as that described in the 1 st bonding layer 16. This can more remarkably prevent bubbles from being generated in the 2 nd bonding layer 17.
The thickness of the 2 nd bonding layer 17 is not particularly limited, and is preferably 5 μm or more and 60 μm or less, more preferably 10 μm or more and 40 μm or less, for example. This can reliably impart the function as the 2 nd bonding layer 17.
The total thickness of the polarizing plate 10 is preferably 0.1mm or more and 2mm or less.
In addition to the case of performing the thermal bending process or the injection molding accompanied by the heat treatment, in order to make the polarizing lens 30 have a structure having a hard coat layer as its outermost layer, even in the case of forming the hard coat layer on the polarizing plate 10 or in the case of assuming a high-temperature space such as an instrument panel in a vehicle in which the sunglasses 100 are arranged for a long period of time, in the present invention, it is possible to reliably suppress the generation of bubbles in the 1 st bonding layer 16 provided in the polarizing plate 10 as described above, and therefore, the haze value can be set in a range of 0.05% to 1.00%.
The polarizing plate, the polarizing lens, and the optical member according to the present invention have been described above, but the present invention is not limited thereto.
For example, each part constituting the polarizing plate of the present invention may be replaced with any structure capable of functioning the same.
The polarizing plate of the present invention may be added with any structure other than the above-described structure.
More specifically, for example, the polarizing plate of the present invention may include an intermediate layer, a power adjusting layer for adjusting the power as a lens, and the like.
Examples (example)
Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.
1. Manufacture of polarizer
Example 1
First, a polyvinyl alcohol film was dyed with an aqueous solution in which a dye was dissolved while being stretched in a water tank, and then treated with boric acid. Then, the treated polyvinyl alcohol film was washed with water and dried. Thus, a polarizing film 13 having a thickness of 35 μm was obtained.
On the other hand, a polycarbonate resin (Iupplon E-2000, manufactured by Mitsubishi gas chemical industry Co., ltd. (MITSUBISHI GAS CHEMICAL COMPANY, INC.)) was used and was molded by extrusion with a vented single screw extruder to obtain a 1 st protective sheet 11 having a thickness of 0.2mm and a retardation of 100 nm.
Further, as the 2 nd protective sheet 12 made of triacetyl cellulose as a main material, FUJITAC (manufactured by FUJITAC film co., ltd. (Fujifilm Investment co.; ltd.) "TD80UL" was prepared to have a thickness of 80 mm).
Next, a two-liquid moisture-curable polyurethane adhesive (main agent (polyol): take ac a-520 by Mitsui Chemicals, inc.) and a curing agent (polyisocyanate compound): take ac "TAKENATE A-50 by Mitsui Chemicals, inc.) as a 1 st adhesive, and a main agent: curing agent=1.0:1.0 were applied to one surface of the 1 st protective sheet 11 by a bar coater so that the thickness of the 1 st bonding layer 16 after drying became 20 μm. On one surface of the 2 nd protective sheet 12, a two-liquid moisture-curable polyurethane adhesive (main agent (polyol): TAKELAC A-520, manufactured by Mitsui Chemicals, inc.), a curing agent (polyisocyanate compound): mitsui Chemicals, inc.), and "TAKENATE A-50", equivalent to a functional group, main agent: curing agent=1.0:1.0), was applied by a bar coater, so that the thickness of the 2 nd bonding layer 17 after drying was 20 μm.
Next, the 1 st protective sheet 11 coated with the 1 st adhesive and the 2 nd protective sheet 12 coated with the 2 nd adhesive are put into an oven, and heated until the solvent components in the 1 st adhesive and the 2 nd adhesive are dried. Thus, a 1 st laminate in which the 1 st bonding layer 16 (1 st adhesive layer) was laminated on one surface of the 1 st protective sheet 11, and a 2 nd laminate in which the 2 nd bonding layer 17 (2 nd adhesive layer) was laminated on one surface of the 2 nd protective sheet 12 were obtained.
Then, the 1 st laminate was laminated on the polarizing film 13 so as to bring the 1 st bonding layer 16 into contact with one surface of the polarizing film 13, and the 2 nd laminate was laminated on the polarizing film 13 so as to bring the 2 nd bonding layer 17 into contact with the other surface of the polarizing film 13, whereby the polarizing plate 10 of example 1 was obtained. At this time, the 1 st laminate, the polarizing film 13 and the 2 nd laminate were each pressed by a rubber roll of a laminator so that the total thickness of the polarizing plate 10 was 0.75mm. After the polarizing plate 10 was obtained, the 1 st adhesive contained in the 1 st bonding layer 16 and the 2 nd adhesive contained in the 2 nd bonding layer 17 were cured completely by curing at 30 ℃ for 1 week.
(examples 2 to 6, comparative examples 1 to 3)
A polarizing plate 10 of examples 2 to 6 and comparative examples 1 to 3 was obtained in the same manner as in example 1, except that the urethane-based adhesive used to form the 1 st bonding layer 16 included in the polarizing plate 10 was an adhesive having the equivalent relationship of the functional groups shown in table 1.
In addition, as the one-liquid moisture-crosslinking polyurethane adhesive, an adhesive having both terminal diisocyanates (manufactured by Mitsui Chemicals, inc., "LA 2355") and trifunctional isocyanates (manufactured by diease Corporation, "DN-902S") was used.
2. Evaluation
The polarizing plates of the examples and comparative examples were evaluated by the following methods.
Determination of haze value of < 1 > polarizer
First, for the polarizing plates of each example and each comparative example, the polarizing plates were prepared in accordance with JIS K7136: 2000, immersed in distilled water at 80℃for 15 minutes. Then, the haze value of the polarizing plate was measured using a haze meter ("NDH 4000") manufactured by japan electric color industry co. (NIPPON DENSHOKU INDUSTRIES co., ltd.).
< 2 > determination of adhesion force of 1 st protective sheet in polarizing plate
First, for the polarizing plates of each example and each comparative example, the polarizing plates were prepared in accordance with JIS K7136: 2000, immersed in distilled water at 80℃for 15 minutes. Then, the adhesive force of the 1 st protective sheet to the polarizing film, which was measured when the polarizing film was cut into a size of 200mm in length by 25mm in width in accordance with JIS K6854-2, and then one end of the 1 st protective sheet of the polarizing film was grasped at 140℃and peeled at a speed of 10 mm/min in a direction of 180℃to a length of 10mm, was measured using a tensile tester (manufactured by Shimadzu corporation (SHIMADZU CORPORATION), "AG-10 kNXplus").
< 3 > determination of haze value of polarizing lens
First, for the polarizing plates of each example and each comparative example, protective films made of polyolefin were laminated on both sides of the polarizing plate, i.e., on the side opposite to the polarizing film of the 1 st protective sheet and on the side opposite to the polarizing film of the 2 nd protective sheet, respectively, by lamination.
Then, the polarizing plate was punched out to a diameter of 8cm, and then subjected to a thermal bending process by using a Lema-forming machine (REMA) (vacuum forming machine) (CR-32 type) at 150℃for 10 minutes under suction, thereby obtaining a radius of curvature R in MD 1 Radius of curvature R over 80.5mm, TD 2 A polarizer of 87.2 mm.
Next, after the protective film was peeled off from the polarizer 10 subjected to thermal bending, a resin layer made of an optical resin for injection molding (MITSUBISHI GAS CHEMICAL composite y, inc., "H-3000") was formed on the curved concave surface (1 st protective sheet) side of the polarizer 10 by an injection molding method using a mold 40 shown in fig. 2 (d), thereby obtaining a polarizing lens.
Then, the obtained polarized lenses were each prepared according to JIS K7136: 2000, immersed in distilled water at 80℃for 15 minutes. Then, the haze value of the polarizing lens was measured using a haze meter ("NDH 4000") manufactured by japan electric color industry co. (NIPPON DENSHOKU INDUSTRIES co., ltd.).
Evaluation of the presence or absence of bubble generation in < 4 > polarization lens
First, for the polarizing plates of each example and each comparative example, protective films made of polyolefin were laminated on both sides of the polarizing plate, i.e., on the side opposite to the polarizing film of the 1 st protective sheet and on the side opposite to the polarizing film of the 2 nd protective sheet, respectively, by lamination.
Then, the polarizing plate was punched out to a diameter of 8cm, and then subjected to a thermal bending process at 150℃for 10 minutes by suction using a Lema-forming machine (REMA) (vacuum forming machine) (CR-32 type), thereby obtaining a radius of curvature R in MD 1 Radius of curvature R over 80.5mm, TD 2 A polarizer of 87.2 mm.
Next, after the protective film was peeled off from the polarizer 10 subjected to thermal bending, a resin layer made of an optical resin for injection molding (MITSUBISHI GAS CHEMICAL composite y, inc., "H-3000") was formed on the curved concave surface (1 st protective sheet) side of the polarizer 10 by an injection molding method using a mold 40 shown in fig. 2 (d), thereby obtaining a polarizing lens.
Then, the presence or absence of the occurrence of air bubbles in the obtained polarizing lens was visually observed, and the case where the occurrence of air bubbles was not confirmed was evaluated as a, the case where the occurrence of a plurality of air bubbles was confirmed was evaluated as B, the case where the occurrence of air bubbles was surely confirmed was evaluated as C, and the case where the occurrence of air bubbles was more clearly confirmed was evaluated as D.
The evaluation results of the polarizing plates of the examples and comparative examples obtained as described above are shown in table 1 below.
TABLE 1
As shown in table 1, in each example, the above-mentioned condition that the haze value in the polarizing plate is 0.05% or more and 1.00% or less was satisfied, and thus, the result that the occurrence of air bubbles in the polarizing plate provided in the polarizing lens can be surely suppressed or prevented when the polarizing lens was obtained was shown.
On the other hand, in each comparative example, the condition that the haze value in the polarizing plate is not less than 0.05% and not more than 1.00% was not satisfied, and the results thereof show that when the polarizing lens was obtained, the occurrence of bubbles was confirmed in the polarizing plate provided in the polarizing lens.
Industrial applicability
According to the present invention, according to JIS 7136:2000, the haze value of the polarizing plate was measured after immersing the polarizing plate in distilled water at 80 ℃ for 15 minutes, and the haze value was set to 0.05% to 1.00%. Therefore, for example, in the case of performing thermal bending processing of a polarizing plate under heating or injection molding of an optical lens to produce a polarizing lens including the polarizing plate, even if the polarizing plate is exposed to high temperature, it can be said that the decrease in the transparency of the polarizing plate is reliably suppressed or prevented. Therefore, a polarizing lens and an optical component having excellent reliability can be manufactured. Therefore, the present invention has industrial applicability.
Claims (11)
1. A polarizing plate is provided with: a polarizing film uniaxially stretched and having an absorption axis in a direction of the uniaxial stretching; a 1 st protective sheet laminated on one surface side of the polarizing film and having birefringence; a 2 nd protective sheet laminated on the other surface side of the polarizing film and having a lower birefringence than the 1 st protective sheet; a 1 st bonding layer bonding the polarizing film and the 1 st protective sheet; and a 2 nd bonding layer bonding the polarizing film and the 2 nd protective sheet, characterized in that,
the 1 st bonding layer is a bonding layer formed by using polyurethane adhesive as a main material,
according to JIS K7136: 2000, the haze value of the polarizing plate is 0.05% or more and 1.00% or less when the haze value of the polarizing plate is measured after immersing the polarizing plate in distilled water at 80 ℃ for 15 minutes.
2. The polarizing plate according to claim 1, wherein,
according to JIS K7136: 2000, immersing the polarizing plate in distilled water at 80 ℃ for 15 minutes, and measuring the adhesion force of the polarizing plate, wherein the adhesion force satisfies the following condition A,
condition a: the polarizing plate was cut into a size of 200mm in length by 25mm in width in accordance with JIS K6854-2, and then one end of the 1 st protective sheet of the polarizing plate was grasped at 140℃and peeled off to a length of 10mm at a speed of 10 mm/min in a direction of 180℃to satisfy the conditions of 40N/25mm to 500N/25 mm.
3. The polarizing plate according to claim 1 or 2, wherein,
the polyurethane adhesive is one-liquid moisture-crosslinking type or two-liquid crosslinking type.
4. A polarizing plate according to any one of claims 1 to 3, wherein,
the 1 st protective sheet is a protective sheet composed of a polycarbonate-based resin or a polyamide-based resin as a main material, and the 2 nd protective sheet is a protective sheet composed of a cellulose-based resin as a main material.
5. The polarizing plate according to any one of claims 1 to 4, wherein,
the polarizing film is based on a polyvinyl alcohol resin or a derivative thereof, contains a dichroic dye, and is uniaxially stretched.
6. The polarizing plate according to any one of claims 1 to 5, wherein,
the polarizing plate is formed in a curved plate shape such that the 1 st protective sheet forms a concave surface and the 2 nd protective sheet forms a convex surface, and is provided in a cavity of a mold of an injection molding machine such that the convex surface side of the polarizing plate is a mold side of the injection molding machine and the concave surface side is exposed, so that an optical lens composed of an injection molding optical resin as a main material and joined to the 1 st protective sheet is formed by injection molding.
7. A polarizing lens, characterized in that,
the polarizing lens includes:
the polarizing plate according to any one of claims 1 to 6, which is formed in a curved plate shape such that the 1 st protective sheet forms a concave surface and the 2 nd protective sheet forms a convex surface; and
the optical lens is formed by injection molding, and is joined to the 1 st protective sheet at the concave surface.
8. The polarized lens of claim 7, wherein,
according to JIS K7136: 2000, the haze value of the polarizing lens is 0.05% or more and 1.00% or less when the haze value of the polarizing lens is measured after immersing the polarizing lens in distilled water at 80 ℃ for 15 minutes.
9. The polarized lens according to claim 7 or 8, wherein,
when the polarizing lens is used, the concave surface of the 1 st protective sheet side of the polarizing plate faces the eye side of the user.
10. The polarized lens according to any one of claims 7 to 9, wherein,
in the polarizing plate provided with the polarizing lens, a difference between an arc in MD and an arc in TD is 0.05 to 0.5.
11. An optical component, characterized in that,
the optical member is provided with the polarizing lens according to any one of claims 7 to 10.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-062406 | 2021-03-31 | ||
| JP2022-012861 | 2022-01-31 | ||
| JP2022012861A JP2022158919A (en) | 2021-03-31 | 2022-01-31 | Polarizing sheet, polarizing lens and optical component |
| PCT/JP2022/016631 WO2022211048A1 (en) | 2021-03-31 | 2022-03-31 | Polarizing sheet, polarizing lens, and optical component |
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| Publication Number | Publication Date |
|---|---|
| CN117295986A true CN117295986A (en) | 2023-12-26 |
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| CN202280025504.1A Pending CN117295986A (en) | 2021-03-31 | 2022-03-31 | Polarizing plate, polarizing lens and optical member |
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| CN (1) | CN117295986A (en) |
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2022
- 2022-03-31 CN CN202280025504.1A patent/CN117295986A/en active Pending
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