JP2017222085A - Method for manufacturing optical laminate and optical laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical laminate and an optical laminate in which a resin plate made of polycarbonate or acryl is adhered to an adherend via a transparent adhesive and peeling or foaming is prevented even in a high temperature and high humidity environment.SOLUTION: A method for manufacturing an optical laminate having a resin plate made of polycarbonate or acryl adhered to an adherend via a transparent adhesive is provided. The method includes: a resin plate surface treatment step where a surface of the resin plate made of polycarbonate or acryl, the surface to be adhered to an adherend is subjected to a surface treatment to control a contact angle with water of the surface to 50° or less measured in accordance with JISR-3257; and a transparent adhesive application step of applying the transparent adhesive on the surface of the resin plate made of polycarbonate or acryl, the surface subjected to the surface treatment.SELECTED DRAWING: None

Description

The present invention is a method for producing an optical laminate in which a resin plate made of polycarbonate or acrylic is attached to an adherend via a transparent adhesive, and does not foam or peel even in a high-temperature and high-humidity environment, And it is related with an optical laminated body.

In recent years, touch panels have been widely used as input devices for electronic devices because of the advantages that they can be operated intuitively and can be downsized. In the manufacture of a touch panel, an adhesive sheet is used to bond the optical members together. Such a pressure-sensitive adhesive sheet is required to have high transparency that does not impair the image of the display module as well as high adhesive strength to each member. For example, Patent Document 1 discloses a polymerizable composition containing a (meth) acryloyl group-containing compound, a vinyl group-containing compound having an amide bond, and a phosphorus-based photopolymerization initiator, and an optical pressure-sensitive adhesive sheet using the same. It is described that this optical pressure-sensitive adhesive tape exhibits good adhesion to an adherend such as glass and can suppress coloring of the pressure-sensitive adhesive tape due to heat.

A capacitive touch panel or the like has a cover panel on the forefront in order to protect the module. Conventionally, glass has been used as the material for the cover panel, but from the viewpoint of improving safety and reducing weight when broken, a transparent resin plate such as polycarbonate or polymethyl methacrylate is used instead of glass. It has become like this. However, when a resin plate is used for the cover panel, there is a problem that foaming may occur at the interface between the cover panel and the transparent adhesive. Since the resin plate has a property that moisture permeability is higher than that of glass and outgas is generated by heating, the transparent adhesive is pushed out by the outgas generated from the resin plate when exposed to a high temperature and high humidity environment, and foaming occurs. For such foaming of the transparent adhesive, conventionally, a countermeasure has been taken such as providing a hard coat layer on the surface of the resin plate to suppress the generation of outgas.

On the other hand, since the cover panel hits the forefront portion of the product, design properties are required, and a cover panel that is easier to mold is desired. However, if the resin plate is easily molded, there is a problem that outgas countermeasures such as hard coat treatment cannot be performed.

Japanese Patent Laying-Open No. 2015-229759

In the optical laminate in which a resin plate made of polycarbonate or acrylic is attached to an adherend via a transparent adhesive, the present inventors have made the gel fraction of the transparent adhesive a certain level or higher, thereby increasing the temperature and humidity. It has been found that foaming in an environment can be suppressed. However, when the gel fraction of the transparent adhesive is set to a certain level or more, there is a problem that the resin plate and the transparent adhesive may be peeled off in a high temperature and high humidity environment.

In view of the present situation, the present invention is an optical laminate in which a resin plate made of polycarbonate or acrylic is attached to an adherend via a transparent adhesive, and does not foam or peel even in a high-temperature and high-humidity environment. It aims at providing the manufacturing method of a body, and an optical laminated body.

The present invention is a method for producing an optical laminate in which a resin plate made of polycarbonate or acrylic is attached to an adherend via a transparent adhesive, and is attached to the adherend of the resin plate made of polycarbonate or acrylic. The surface of the resin plate is subjected to a surface treatment to adjust the water contact angle measured in accordance with JIS R-3257 to 50 ° or less, and the surface of the resin plate made of polycarbonate or acrylic. It is a manufacturing method of the optical laminated body which has a transparent adhesive sticking process of sticking the said transparent adhesive to the surface of the side which gave the process.
The present invention is described in detail below.

In producing an optical laminate in which a resin plate made of polycarbonate or acrylic is pasted on an adherend through a transparent adhesive, the present inventors previously performed a surface treatment on the surface of the resin plate made of polycarbonate or acrylic. It was found that an optical laminate that does not foam or peel even under a high-temperature and high-humidity environment can be obtained by adjusting the water contact angle within a certain range.

The method for producing an optical laminate of the present invention is a method for producing an optical laminate in which a resin plate made of polycarbonate or acrylic is attached to an adherend via a transparent adhesive.
The resin plate is made of polycarbonate or acrylic. Such a resin plate is light and transparent, and is excellent in impact resistance. Therefore, it is suitable for optical applications such as a cover panel in order to protect the module. The resin plate made of polycarbonate or acrylic has a problem that foaming occurs at the interface with the transparent adhesive and the transparent adhesive layer is peeled off. The optical laminate produced by the method for producing an optical laminate of the present invention The body does not foam or peel off even in a high temperature and high humidity environment.

Although it does not specifically limit as said adherend, A metal or metal oxide thin film-attached film, glass with a metal or metal oxide thin film, a polarizing plate, a touch panel module, or a display module is mentioned.

Although it does not specifically limit as said transparent adhesive, Since it is excellent in transparency and high adhesive force is obtained, it is preferable to contain the acrylic copolymer which has the structural unit derived from (meth) acrylate. Especially, it is more preferable to contain 40 to 85 weight% of structural units derived from the (meth) acrylate which has a C1-C15 hydrocarbon group from a viewpoint of low-temperature adhesive force. Here, (meth) acrylate means acrylate or methacrylate.

Examples of the (meth) acrylate having a hydrocarbon group having 1 to 15 carbon atoms include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, tert -Butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, 2-ethyloctyl (meth) acrylate, nonyl (meth) acrylate, Decyl (meth) acrylate, isotetradecyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, n-cetyl (meth) acrylate, n-stearyl (meth) acrylate, cyclopropyl (meth) acrylate Rate, cyclobutyl (meth) acrylate, cyclobutyl (meth) acrylate, cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, cycloheptyl (meth) acrylate, cyclooctyl (meth) acrylate, isobornyl (meth) acrylate, 1,4- Examples include butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and 1,9-nonanediol di (meth) acrylate. In addition, the said (meth) acrylate may be used independently and may use 2 or more types together.

Examples of the (meth) acrylate other than the (meth) acrylate having a hydrocarbon group having 1 to 15 carbon atoms include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl ( And (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and the like. In addition, the said (meth) acrylate may be used independently and may use 2 or more types together.

Examples of the structural unit other than the structural unit derived from the (meth) acrylate in the acrylic copolymer include (meth) acrylic acid, silicone copolymer, and the like.

In order to obtain the (meth) acrylate copolymer, a mixture of monomers serving as the basis for the structural unit may be subjected to a radical reaction in the presence of a polymerization initiator. As a method for polymerizing the acrylic copolymer, a conventionally known method such as solution polymerization is used, but ultraviolet polymerization capable of producing a pressure-sensitive adhesive sheet without solvent is preferable in consideration of the global environment and the human body.
A photopolymerization initiator is required for ultraviolet polymerization, but the photopolymerization initiator is not particularly limited. For example, 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl- Phenyl-ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propane-1 -One, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 1,2-octanedione, 1- [4- (phenylthio) -2- (O-benzoyloxime)] and the like. These photopolymerization initiators may be used alone or in combination of two or more.

The transparent adhesive may contain a crosslinking agent. By appropriately adjusting the type or amount of the crosslinking agent, the gel fraction of the obtained transparent adhesive can be adjusted, and excellent foam resistance and workability can be exhibited.

The crosslinking agent is not particularly limited, and may be, for example, a polyfunctional monomer, an isocyanate crosslinking agent, or an aziridine crosslinking agent, depending on the type of crosslinking functional group of the (meth) acrylate copolymer contained in the transparent adhesive. An epoxy type cross-linking agent, a metal chelate type cross-linking agent, etc. are selected and used.
Examples of the polyfunctional monomer include 1,6-hexanediol di (meth) acrylate.

When the transparent adhesive is the acrylic copolymer, the amount of the crosslinking agent is preferably 0.01 to 20 parts by weight, preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the acrylic copolymer. Is more preferable. Within this range, the gel fraction of the pressure-sensitive adhesive layer can be adjusted to an appropriate range.

The transparent adhesive preferably has a gel fraction of 50% by weight or more. When the gel fraction of the transparent adhesive was less than 50% by weight, the optical laminate in which the resin plate made of polycarbonate or acrylic was attached to the adherend via the transparent adhesive was placed in a high-temperature and high-humidity environment. In some cases, the foaming can be suppressed to 50% by weight or more as compared with the case where foaming occurs on almost the entire surface. As the gel fraction is increased to 60 wt%, 70 wt%, and 80 wt%, foaming decreases, and when the gel fraction is 85 wt% or more, foaming can be substantially prevented. Thus, when the gel fraction of a transparent adhesive is adjusted more than fixed, it becomes easy to peel a resin plate and a transparent adhesive in a high temperature, high humidity environment. In the present invention, by using a resin plate made of polycarbonate or acrylic whose surface contact angle with water is adjusted to 50 ° or less, peeling can be prevented while preventing foaming.

The gel fraction is measured as follows. First, the transparent adhesive was cut into a flat rectangular shape of 50 mm × 100 mm to prepare a test piece. After the test piece was immersed in ethyl acetate at 23 ° C. for 24 hours, the test piece was taken out from ethyl acetate, and the condition of 110 ° C. Dry under 1 hour. The weight of the test piece after drying is measured, and the gel fraction is calculated using the following formula.
Gel fraction (% by weight) = 100 × (W2-W0) / (W1-W0)
(W0: weight of substrate, W1: weight of test piece before immersion, W2: weight of test piece after immersion and drying)

The transparent adhesive may further contain a tackifier resin.
Examples of the tackifying resin include a hydrogenated rosin ester resin and a hydrogenated terpene phenol resin.

The above-mentioned transparent pressure-sensitive adhesive is within a range that does not impair the effects of the present invention, if necessary, and tackifier, coupling agent, colorant, ultraviolet absorber, light stabilizer, rust inhibitor, antioxidant, chain You may contain well-known additives, such as a transfer agent, a polymerization inhibitor, a plasticizer, a softener, an antistatic agent, an emulsifier, microparticles | fine-particles, a filler, surfactant, wax, a pigment, and dye.

You may use the said transparent adhesive in the form of the transparent adhesive sheet excellent in the handleability. When the transparent adhesive is used in the form of a transparent adhesive sheet, the transparent adhesive sheet may be a support type having a base material or a non-support type having no base material. In the case of the support type, a pressure-sensitive adhesive layer made of the transparent pressure-sensitive adhesive may be formed on one side of the base material, or a pressure-sensitive adhesive layer made of the transparent pressure-sensitive adhesive may be formed on both sides of the base material. Good.

Although the said base material will not be specifically limited if it is transparent, For example, a polyethylene terephthalate, a polyethylene naphthalate, a polyethylene isophthalate, polyester, polyethylene etc. are mentioned.

Although the thickness of the said base material is not specifically limited, A preferable minimum is 1 micrometer and a preferable upper limit is 50 micrometers. When the thickness of the base material is within the above range, the base material can have an appropriate mechanical strength and stiffness, and can be adhered and adhered along the shape of the adherend. A more preferable lower limit of the thickness of the substrate is 5 μm, and a more preferable upper limit is 25 μm.

The thickness of the pressure-sensitive adhesive layer is not particularly limited, but a preferable lower limit is 1 μm and a preferable upper limit is 1000 μm. When the thickness is within the above range, both adhesive force and foam suppression can be achieved. The minimum with more preferable thickness of the said adhesive layer is 5 micrometers, and a more preferable upper limit is 500 micrometers.

The method for producing an optical layered body according to the present invention includes a surface treatment on a surface to be adhered to an adherend of a resin plate made of the above polycarbonate or acrylic, and is in contact with water measured according to JIS R-3257. It has a resin plate surface treatment step for setting the angle to 50 ° or less.
By performing the resin plate surface treatment step in advance before the transparent adhesive pasting step described later, the resin plate made of polycarbonate or acrylic is used for foaming or peeling even in a high temperature and high humidity environment. It is possible to obtain an optical layered body that is not loose. This is because the adhesive force of the transparent adhesive to the resin plate becomes extremely high in the resin plate with a water contact angle within a certain range by surface treatment, and even if outgas is generated from the resin plate, the pressure due to the outgas is reduced. It is considered that it is possible to withstand and prevent foaming and peeling from occurring at the interface between the transparent adhesive and the resin plate.
When the water contact angle on the surface of the resin plate exceeds 50 °, the effect of the surface treatment is not exhibited, and the adhesive strength sufficient to withstand outgas cannot be exhibited. A preferable upper limit of the water contact angle on the surface of the resin plate is 40 °.
Although the lower limit of the water contact angle on the surface of the resin plate is not particularly limited, the lower limit is substantially about 10 °.

The surface treatment method is not particularly limited as long as the contact angle with water can be adjusted to 50 ° or less. However, plasma treatment or corona treatment is preferable because it is easy to operate and suitable for industrial production.
The method for the plasma treatment or the corona treatment is not particularly limited, and a conventionally known method can be used.
That is, the plasma treatment is performed using, for example, an atmospheric pressure plasma treatment apparatus (for example, “AP-T01” manufactured by Sekisui Chemical Co., Ltd.) with an oxygen concentration of 500 to 1000 ppm and a treatment speed of 0.1 to 1.5 m / min. By performing the treatment under conditions, the water contact angle on the surface of the resin plate can be adjusted to an intended range.
That is, for example, the corona treatment is performed by using a high-frequency power source (for example, “AGI020” manufactured by Kasuga Denki Co., Ltd.) as a corona treatment device, and performing the treatment at a treatment speed of 0.1 to 1 m / min. The water contact angle on the surface of the resin plate can be adjusted to an intended range.

The manufacturing method of the optical laminated body of this invention has a transparent adhesive sticking process of sticking the said transparent adhesive to the surface of the side which gave the surface treatment of the resin board which consists of the said polycarbonate or an acryl.
The method of sticking is not particularly limited. For example, a pressure-sensitive adhesive composition containing a monomer mixture or a polymerization initiator as a raw material for the (meth) acrylate copolymer on the surface of the resin plate subjected to surface treatment. For example, a method of polymerizing the (meth) acrylate copolymer by irradiating ultraviolet rays after coating the product.
Moreover, when using the said transparent adhesive in the form of a transparent adhesive sheet, you may affix this transparent adhesive sheet on the surface of the side which gave the surface treatment of the said resin board.

By the resin plate surface treatment step and the transparent adhesive sticking step, a transparent adhesive-attached resin plate with a transparent adhesive stuck on the surface of the resin plate is obtained, and by sticking this to the adherend, An optical laminate can be obtained. Further, after a transparent adhesive is pasted on the surface of the adherend to obtain an adherend with a transparent adhesive, the optical laminate is pasted on the surface of the resin plate on which the surface treatment has been performed. May be obtained.

The optical laminate produced by the method for producing an optical laminate of the present invention may foam or peel even in a high-temperature and high-humidity environment, even though the resin plate made of polycarbonate or acrylic is used. Absent.
An optical laminated body in which a resin plate made of polycarbonate or acrylic is attached to an adherend via a transparent adhesive, and the surface on the side to be attached to the adherend of the resin plate made of polycarbonate or acrylic is JIS R An optical laminate having a water contact angle measured in accordance with -3257 of 50 ° or less is also one aspect of the present invention.

According to the present invention, a resin plate made of polycarbonate or acrylic is attached to an adherend via a transparent adhesive, and an optical laminate that does not foam or peel even in a high-temperature and high-humidity environment. Methods and optical stacks can be provided.

Hereinafter, embodiments of the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

Example 1
(1) Surface Treatment of Resin Plate Using “AP-T01” manufactured by Sekisui Chemical Co., Ltd. on the surface of a resin plate (PC1151, manufactured by Teijin Ltd., 120 mm × 180 mm × 2 mm) made of polycarbonate (PC), the processing speed is 0. Plasma treatment was performed under the conditions of .25 m / min and oxygen concentration of 1000 ppm. The surface on the side subjected to the plasma treatment was measured for a water contact angle in accordance with JIS R-3257 and found to be 20 °.

(2) Production of optical layered body A reactor equipped with a thermometer, a stirrer, a cooling tube, and an ultraviolet irradiation device, 9 parts by weight of n-butyl acrylate, 38 parts by weight of 2-ethylhexyl acrylate, and 32 parts of isobornyl acrylate .45 parts by weight, 20 parts by weight of 4-hydroxybutyl acrylate and 0.25 parts by weight of acrylic acid were added and the atmosphere was replaced with nitrogen, and then the viscosity (BH viscometer No. 5 rotor, 10 rpm, measurement temperature 25 ° C.) was about 4 Pa. -Ultraviolet rays were irradiated into the reactor until s was obtained to obtain a solution containing a polymer in which a part of the monomer component was polymerized.
To the resulting solution, 0.2 parts by weight of 1,6-hexanediol diacrylate and 0.05 parts by weight of 2,2-dimethoxy-1,2-diphenylethane-1-one were added and stirred to obtain an adhesive. A composition was obtained.

The obtained pressure-sensitive adhesive composition was coated on a glass plate (120 mm × 180 mm × 1 mm) so that the thickness of the transparent pressure-sensitive adhesive was 250 μm, and a polyethylene terephthalate (PET) separator was overlaid, and then a chemical lamp Was irradiated with ultraviolet rays having an illuminance of ² mW / cm ² for 360 seconds to obtain a transparent adhesive. Thereafter, the PET separator was peeled off, and a transparent adhesive was bonded to the surface of the resin plate made of polycarbonate that had been subjected to the plasma treatment to obtain an optical laminate.

In addition, about the gel fraction of the transparent adhesive in the obtained optical laminated body, the gel fraction was measured with the following method. First, the transparent adhesive sampled from the optical laminate was cut into a flat rectangular shape of 50 mm × 100 mm to prepare a test piece. The test piece was immersed in ethyl acetate at 23 ° C. for 24 hours, and then taken out from ethyl acetate. And dried at 110 ° C. for 1 hour. The weight of the test piece after drying was measured, and the gel fraction was calculated using the following formula.
Gel fraction (% by weight) = 100 × (W2-W0) / (W1-W0)
(W0: weight of substrate, W1: weight of test piece before immersion, W2: weight of test piece after immersion and drying)

(Examples 2 to 8, Comparative Examples 1 and 2)
An optical laminate was obtained in the same manner as in Example 1 except that the surface treatment (water contact angle) of the resin plate and the cross-linking (gel fraction) of the transparent adhesive were as shown in Table 1.

Example 9
The surface of a resin plate (PC1151, manufactured by Teijin Ltd., 120 mm x 180 mm x 2 mm) made of polycarbonate (PC) is subjected to corona treatment at a treatment speed of 0.1 m / min using "AGI020" produced by Kasuga Electric. went. The water contact angle of the surface on the side subjected to the corona treatment was measured according to JIS R-3257 and found to be 20 °.
An optical laminate was obtained in the same manner as in Example 1 except that the obtained corona-treated resin plate was used and the cross-linking (gel fraction) of the transparent adhesive was as shown in Table 1.

(Comparative Example 3)
An optical laminate was obtained in the same manner as in Example 9 except that the surface treatment (contact angle with water) of the resin plate and the crosslinking (gel fraction) of the transparent adhesive were as shown in Table 1.

(Example 10)
(1) Surface treatment of resin plate On the surface of a resin plate (L001, manufactured by Mitsubishi Rayon Co., 120 mm × 180 mm × 2 mm) made of polymethyl methacrylate (PMMA), “AP-T01” manufactured by Sekisui Chemical Co., Ltd. was used. The plasma treatment was performed under the conditions of a treatment speed of 0.25 m / min and an oxygen concentration of 1000 ppm. The surface on the side subjected to the plasma treatment was measured for a water contact angle in accordance with JIS R-3257 and found to be 20 °.

(2) Production of optical layered body A reactor equipped with a thermometer, a stirrer, a cooling tube, and an ultraviolet irradiation device, 9 parts by weight of n-butyl acrylate, 38 parts by weight of 2-ethylhexyl acrylate, and 32 parts of isobornyl acrylate .45 parts by weight, 20 parts by weight of 4-hydroxybutyl acrylate and 0.25 parts by weight of acrylic acid were added and the atmosphere was replaced with nitrogen, and then the viscosity (BH viscometer No. 5 rotor, 10 rpm, measurement temperature 25 ° C.) was about 4 Pa. -Ultraviolet rays were irradiated into the reactor until s was obtained to obtain a solution containing a polymer in which a part of the monomer component was polymerized.
To the resulting solution, 0.2 parts by weight of 1,6-hexanediol diacrylate and 0.05 parts by weight of 2,2-dimethoxy-1,2-diphenylethane-1-one were added and stirred to obtain an adhesive. A composition was obtained.

The obtained pressure-sensitive adhesive composition was coated on a glass plate (120 mm × 180 mm × 1 mm) so that the thickness of the transparent pressure-sensitive adhesive was 250 μm, and after superposing a PET separator, an illuminance of ² mW / cm ^{2 with} a chemical lamp. Was irradiated for 360 seconds to obtain a transparent adhesive. Thereafter, the PET separator was peeled off, and a transparent adhesive was bonded to the surface of the resin plate made of polymethyl methacrylate on the side subjected to plasma treatment to obtain an optical laminate.

In addition, about the gel fraction of the transparent adhesive in the obtained optical laminated body, the gel fraction was measured with the following method. First, the transparent adhesive sampled from the optical laminate was cut into a flat rectangular shape of 50 mm × 100 mm to prepare a test piece. The test piece was immersed in ethyl acetate at 23 ° C. for 24 hours, and then taken out from ethyl acetate. And dried at 110 ° C. for 1 hour. The weight of the test piece after drying was measured, and the gel fraction was calculated using the following formula.
Gel fraction (% by weight) = 100 × (W2-W0) / (W1-W0)
(W0: weight of substrate, W1: weight of test piece before immersion, W2: weight of test piece after immersion and drying)

(Examples 11 to 17, Comparative Examples 4 and 5)
An optical laminate was obtained in the same manner as in Example 10 except that the surface treatment (water contact angle) of the resin plate and the cross-linking (gel fraction) of the transparent adhesive were as shown in Table 1.

(Example 18)
The surface of a resin plate made of polymethyl methacrylate (PMMA) (L001, manufactured by Mitsubishi Rayon Co., Ltd., 120 mm × 180 mm × 2 mm) was subjected to a treatment speed of 0.1 m / min using “AGI020” manufactured by Kasuga Denki. Corona treatment was performed. The water contact angle of the surface on the side subjected to the corona treatment was measured according to JIS R-3257 and found to be 20 °.
An optical laminate was obtained in the same manner as in Example 10 except that the obtained corona-treated resin plate was used and the crosslinking (gel fraction) of the transparent adhesive was as shown in Table 1.

(Comparative Example 6)
An optical laminate was obtained in the same manner as in Example 18 except that the surface treatment (contact angle with water) of the resin plate and the cross-linking (gel fraction) of the transparent adhesive were as shown in Table 1.

(Evaluation)
The following evaluation was performed about the optical laminated body obtained by the Example and the comparative example. The results are shown in Table 1.

(Evaluation of foam resistance and peel resistance)
The optical laminates obtained in the examples and comparative examples were allowed to stand for 100 hours in a constant temperature and humidity chamber having a temperature of 85 ° C. and a humidity of 85%.
The optical laminate after the high temperature and high humidity treatment was visually observed and evaluated according to the following criteria.
A: No peeling and almost no foaming was observed at the interface between the resin plate and the transparent adhesive. ○: No peeling was observed, but very little foaming was observed at the interface between the resin plate and the transparent adhesive. ×: peeled off

According to the present invention, a resin plate made of polycarbonate or acrylic is attached to an adherend via a transparent adhesive, and an optical laminate that does not foam or peel even in a high-temperature and high-humidity environment. Methods and optical stacks can be provided.

Claims (5)

A method for producing an optical laminate in which a resin plate made of polycarbonate or acrylic is attached to an adherend via a transparent adhesive,
The surface of the resin plate which is subjected to surface treatment on the surface of the resin plate made of polycarbonate or acrylic and which is attached to the adherend, and the water contact angle measured according to JIS R-3257 is adjusted to 50 ° or less. Processing steps;
The manufacturing method of the optical laminated body characterized by having the transparent adhesive sticking process of sticking the said transparent adhesive to the surface of the side which gave the surface treatment of the resin board which consists of the said polycarbonate or an acryl. The method for producing an optical laminate according to claim 1, wherein the transparent adhesive has a gel fraction of 50% by weight or more. The method for producing an optical laminate according to claim 1, wherein the transparent adhesive has a gel fraction of 85% by weight or more. The optical substrate according to claim 1, 2 or 3, wherein the adherend is a film with a metal or metal oxide thin film, a glass with metal or metal oxide thin film, a polarizing plate, a touch panel module, or a display module. A manufacturing method of a layered product. An optical laminate in which a resin plate made of polycarbonate or acrylic is attached to an adherend via a transparent adhesive,
An optical laminate having a water contact angle measured according to JIS R-3257 of the surface of the resin plate made of polycarbonate or acrylic attached to the adherend is 50 ° or less.