JP2007152847A - Steam-barrier transparent laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the warping due to the change in the temperature environment of a steam-barrier transparent laminate having a steam-barrier film laminated on only one side of a transparent plate. <P>SOLUTION: The steam-barrier transparent laminate has a laminate structure in which a transparent adhesive layer 2 and then a steam-barrier transparent film 3 are sequentially laminated on a transparent plate 1. The steam-barrier transparent film 3 is composed of a transparent steam-barrier layer 5 laminated on a stretched-modified PET film 4. The difference in the average linear expansion coefficient between the stretch-modified PET film 4 and the transparent plate 1 at 30°C-60°C is <3×10<SP>-5</SP>/°C. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a water vapor barrier transparent laminate that can be suitably used as a member that is used particularly in parts that require transparency and water vapor barrier properties, such as solar cells and organic EL front panels.

  As this kind of water vapor barrier transparent laminate, there are many ones having a structure in which a transparent metal oxide film is formed on the surface of a transparent plate. For example, methods such as vacuum deposition, PVD, CVD, and sputtering of silicon oxide, aluminum oxide, etc. Most of them are formed by directly laminating on the surface of the transparent plate (see, for example, Patent Documents 1-3).

  However, since the water vapor barrier transparent laminate having such a configuration must be manufactured in a single wafer type in which metal vapor deposition is performed on each transparent plate when forming a transparent water vapor barrier layer, It is difficult to produce continuously on a series of production lines, production efficiency is poor, it is difficult to widen the sheet, and because the number of processes increases, it is difficult to manage foreign matter and scratches, and yield is poor. I had a problem that said.

  On the other hand, for example, in Patent Document 4 and the like, although it is not a water vapor barrier transparent laminate, a film comprising a functional layer having a predetermined function is laminated on one side or both sides of a transparent plate made of synthetic resin. A laminated body is disclosed, and similarly in a water vapor barrier transparent laminate, if a film having a water vapor barrier property is laminated on one or both sides of a transparent plate, it is easily produced in a large amount and with a high yield. It becomes possible.

JP 2004-276666 A JP 2005-103768 A JP 2005-297243 A JP 2005-148542 A

  However, when a film having a water vapor barrier property is laminated only on one side of a transparent plate made of a synthetic resin, the laminate is warped due to a change in environmental temperature, and stress is applied to the mounting portion and the entire device, and the device Durability may be reduced.

  Therefore, the present invention is a water vapor barrier transparent laminate having a structure in which a film having a water vapor barrier property is laminated only on one side of a transparent plate, and has a water vapor barrier property that does not warp due to a change in temperature environment. It is intended to provide a transparent laminate.

The present invention is a water vapor barrier transparent laminate having a laminated structure in which a transparent adhesive layer 2 and a water vapor barrier transparent film 3 are sequentially laminated only on one side of a transparent plate 1 made of a synthetic resin, The barrier transparent film 3 has a configuration in which a transparent water vapor barrier layer 5 is laminated on a stretch-modified PET film 4, and the stretch-modified PET film 4 has an average linear expansion coefficient at 30 ° C. to 60 ° C. A water vapor barrier transparent laminate having a difference from the transparent plate 1 within 3 × 10 ⁻⁵ / ° C. is proposed.

The stretch-modified PET film is excellent in transparency and has a feature that there are few appearance defects such as scratches on the film surface. In addition, a polyethylene terephthalate (in the present invention, “PET” The coefficient of linear expansion can be adjusted by modifying the above. Therefore, the present invention employs a stretch-modified PET film as a base film of the water vapor barrier transparent film 3, and the stretch-modified PET film 4 and the transparent substrate 1 have an average linear expansion coefficient at 30 ° C to 60 ° C. By designing the difference to be within 3 × 10 ⁻⁵ / ° C., it is possible to suppress the occurrence of warpage due to changes in the temperature environment.
Moreover, since the water vapor | steam barrier transparent laminated body of this invention sticks and forms the water vapor | steam barrier transparent film 3 through the transparent adhesion layer 2 on the transparent board 1, it is an extrusion method or a continuous casting method, for example. In the extension line of the production line that continuously forms the transparent plate 1, the water vapor barrier transparent film 3 is bonded to one side surface of the transparent plate 1 through the transparent adhesive layer 2 with a pressure roller. In addition to being able to produce continuously and efficiently, it is easy to widen the sheet body, and because there are few processes, it is easy to manage foreign matter and scratches and has a good yield. is doing.
The above-described extrusion method or continuous casting method generally includes methods that can be generally regarded as an extrusion method or a continuous casting method, and these can be freely used in the present invention.

Embodiment of the Invention

Next, this invention is demonstrated based on embodiment.
However, the embodiment described below is an example of the embodiment of the present invention, and the scope of the present invention is not limited to the following embodiment.

In the present specification, the expression “main component” or “main agent” includes the meaning of allowing other components to be contained within a range that does not interfere with the function of the main component unless otherwise specified. is there. In particular, the content ratio of the main component is not specified, but the component (when two or more components are main components, the total amount thereof) is 50% by mass or more, particularly 70% by mass or more in the composition. Is generally occupied.
In this specification, when “X to Y” (X and Y are arbitrary numbers) is described, it means “X or more and Y or less” unless otherwise specified, and “preferably larger than X, Y It includes the meaning of “smaller”.

  As shown in FIGS. 1 and 2, the water vapor barrier transparent laminate of the present embodiment is formed by sequentially laminating a transparent adhesive layer 2 and a water vapor barrier transparent film 3 on one side of a transparent plate 1 made of a synthetic resin. A water vapor barrier transparent laminate having the structure as described above.

(Transparent plate 1)
The shape and material of the transparent plate 1 are not particularly limited as long as it is transparent and flat. Specifically, polymethylmeth (a) acrylate (PMMA) resin, polycarbonate (PC) resin, methyl methacrylate-styrene copolymer resin (MS resin), polyarylate resin, polysulfone resin, polyethersulfone resin, norbornene resin and A transparent plate mainly composed of at least one member selected from the group consisting of cycloolefin (alicyclic) resins can be used.

  The transparent plate 1 has, as its constituent components, conventionally known additives such as phenol-based and phosphorus-based antioxidants, halogen-based and phosphorus-based flame retardants, heat-resistant anti-aging agents, ultraviolet absorbers, lubricants, electrification An inhibitor or the like may be included.

  The transparent plate 1 may be a single-layer plate or a multi-layer plate having two or more layers. For example, as a transparent plate having weather resistance, it is possible to use a transparent plate produced by coextrusion using a weather resistant polycarbonate or fluororesin having weather resistance on the surface layer.

  The thickness of the transparent plate 1 is not particularly limited, but is preferably adjusted as appropriate within a range of 0.5 mm to 10 mm according to the processing method. For example, in the case of punching, it is preferable to set the thickness in the range of 0.5 mm to 1.5 mm from the viewpoint of obtaining a product with a small end face whitening and a good appearance.

  The transparency of the transparent plate 1 is preferably such that the total light transmittance according to JIS K-7105 is 85% or more and less than 1% of haze.

(Transparent adhesive layer 2)
The transparent adhesive layer 2 can be formed using a commonly used UV curable or thermosetting adhesive. Among them, preferably formed by using a 180 ° C. of viscoelasticity ^{1 × 10 5 Pa~1 × 10 6} Pa, the pressure-sensitive adhesive made of a transparent resin in particular ^{2 × 10 5 Pa~5 × 10 5} Pa.
If the adhesive has such viscoelasticity, the transparent adhesive layer 2 has elasticity superior to the foaming force of the outgas against the outgas generated from the transparent plate 1 in a high temperature / humid heat environment. Foaming, peeling, floating, etc. at the interface with the transparent adhesive layer 2 or the interface between the water vapor barrier transparent film 3 and the transparent adhesive layer 2 can be suppressed. In addition, when pasting with an adhesive, it is generally necessary to autoclave in order to advance wetting. However, if the adhesive satisfies the above range, there is no need to autoclave, and a high temperature and high humidity test. The durability in (for example, 60 ° C. and 95% RH, left for 168 hours) can be improved.

The composition of the pressure-sensitive adhesive is not particularly limited. For example, a (meth) acrylic acid ester copolymer mainly composed of an alkyl (meth) acrylate, a functional group-containing monomer, and a (meth) acryloyl group-containing copolymer. And what has the molecular weight of a copolymer as a main ingredient about 500,000-2 million can be mentioned.
Examples of such (meth) acrylic acid ester-based copolymers include those obtained by copolymerizing 2-ethylhexyl acrylate, n-butyl acrylate, acrylic acid, and other monomers (macromonomer or vinyl monomer). it can.

In order to adjust the cohesive force and viscoelasticity of the pressure-sensitive adhesive, it is preferable to add a polyfunctional compound capable of forming a crosslinked structure between the (meth) acrylic acid ester copolymers as a crosslinking agent.
In this case, examples of the crosslinking agent include isocyanate compounds, epoxy compounds, amine compounds, metal chelate compounds, and aziridine compounds. Examples of the epoxy compounds include bisphenol A, ethylene glycol glycidyl ether, and glycerin. Diglycidyl ether and the like can be mentioned. Examples of the amine compound include hexamethylene diamine and triethyl diamine. Examples of the metal chelate compound include aluminum, iron, copper, zinc, tin, titanium, nickel, and antimony. , Magnesium, vanadium, chromium, and other polyvalent metals are coordinated to acetylacetone and ethyl acetoacetate. Examples of the aziridine compounds include triethylenemelamine.
Such a cross-linking agent may be usually added in an amount of 0.001 to 0.1 parts by mass with respect to 100 parts by mass of the main component (for example, acrylic resin component), and the type and amount of the cross-linking agent are adjusted. By doing so, the viscoelasticity of the pressure-sensitive adhesive can be adjusted to the above range.

  In addition, you may mix | blend components, such as a well-known additive, for example, a tackifier, a plasticizer, a softener, dye, a silane coupling agent.

Commercially available products can be used as the pressure-sensitive adhesive satisfying the above conditions. For example, “Product Name SK Dyne 1882” (180 ° C. Viscoelasticity: 3.1 × 10 ⁵ Pa) manufactured by Soken Chemical Co., Ltd. “Product Name SK Dyne 1888” (180 ° C. Viscoelasticity manufactured by Soken Chemical Co., Ltd .: 2.5 × 10 ⁵ Pa) or the like can be used.

  The thickness of the transparent adhesive layer 2 is preferably 10 μm to 30 μm. In order to obtain more adhesive strength, it is more preferable that the thickness be 15 μm or more. On the other hand, if the thickness exceeds 30 μm, the adhesive surface may be greatly roughened during the adhesive coating, and the appearance may be deteriorated. From such a viewpoint, the thickness of the transparent adhesive layer 2 is more preferably 15 μm to 25 μm.

(Water vapor barrier transparent film 3)
The water vapor barrier transparent film 3 has a configuration in which a transparent water vapor barrier layer 5 is formed on one side of a stretch-modified PET film 4.

As shown in FIG. 1, the water vapor barrier transparent film 3 is configured such that the transparent plate 1 and the stretch-modified PET film 4 are laminated via the transparent adhesive layer 2, and the transparent water vapor barrier layer 5 is exposed to the outer surface. Further, as shown in FIG. 2, the transparent plate 1 and the transparent water vapor barrier layer 5 are laminated via the transparent adhesive layer 2 so that the stretch-modified PET film 4 is exposed to the outer surface. You can also
In the former case, that is, when the transparent water vapor barrier layer 5 is configured to be exposed on the outer surface, it is preferable mainly when a layer or film is further applied or laminated on the surface of the stretch-modified PET film 4, and the adhesion is further improved. It can be further enhanced.
On the other hand, in the latter case, when the stretch-modified PET film 4 is configured to be exposed to the outer surface, the transparent water vapor barrier layer 5 is not exposed to the outer surface, so that pinholes can be prevented from being generated due to scratches, etc. The durability of the barrier performance can be improved.

  The stretch-modified PET film 4 is excellent in transparency and excellent in appearance as an optical application compared to an unstretched film. That is, even if the surface of the film before stretching, in other words, the film just pushed out, has surface defects such as scratches generated when passing through the die, the surface defects can be eliminated by stretching stress. Excellent appearance for optical use.

The stretch-modified PET film 4 has a feature that the linear expansion coefficient can be adjusted by adjusting and modifying the copolymer component.
As the stretch-modified PET film 4 used in the present embodiment, the difference from the transparent plate 1 is within 3 × 10 ⁻⁵ / ° C., preferably 2 × 10 ⁻⁵ / in the average linear expansion coefficient at 30 ° C. to 60 ° C. It is important to use one that is within ° C (the difference may be 0). If the stretch-modified PET film 4 satisfies this range, for example, even when used at a high temperature around 60 ° C., the difference in dimensional change accompanying the temperature change between the transparent plate 1 and the water vapor barrier transparent film 3 is kept within a predetermined range. And the warpage of the laminate can be prevented.

The composition of the stretch-modified PET film 4 is, for example, a stretched polyester containing a copolyester synthesized from an aromatic dicarboxylic acid component and ethylene glycol and a branched aliphatic glycol or a glycol component containing an aliphatic glycol, What adjusted the expansion coefficient so that it might enter into the predetermined range can be mentioned. Preferably, it can be adjusted by a copolymerization component described in paragraphs [0016] and [0038] to [0040] of JP-A-2005-66939, for example, containing terephthalic acid and ethylene glycol as main components. Diethylene glycol and 1-4 butanediol can be copolymerized and adjusted.
In addition, the modified PET film 4 can also be purchased by designating an average linear expansion coefficient at 30 ° C. to 60 ° C. For example, as a modified PET film having an average linear expansion coefficient of 5 × 10 ⁻⁵ / ° C. to 8 × 10 ⁻⁵ / ° C., there is a commercial product such as a product name: Soft Shine A1532 (manufactured by Toyobo Co., Ltd.) ( For example, see paragraph [0016] of JP-A-2005-66939.

Note that. In order to increase the adhesion, the surface of the film 4 may be subjected to corona treatment in advance.
The thickness of the stretch-modified PET film 4 is not particularly limited, but since an optical film having a thickness exceeding 300 μm is generally not commercially available, about 300 μm is the upper limit at this stage. In general, a thickness of 50 μm to 100 μm is preferable.

  The transparent water vapor barrier layer 5 can be composed of a transparent metal oxide film, and the material is not particularly limited. For example, silicon oxide, aluminum oxide, zinc oxide, indium tin oxide (ITO), nitriding Examples thereof include silicon, magnesium fluoride, and titanium oxide, which can be formed on the surface of the stretch-modified PET film 4 by a method such as vacuum deposition, PVD, CVD, or sputtering.

  Regarding the transparency of the water vapor barrier transparent film 3, the total light transmittance according to JIS K-7105 is preferably 80% or more.

(Production method)
Next, the manufacturing method of the water vapor | steam barrier transparent laminated body of this embodiment is demonstrated. However, it is not limited to these methods.

  In consideration of production efficiency such as mass production and yield, the water vapor barrier transparent laminate of the present embodiment is preferably produced on a production line for producing the transparent plate 1. Specifically, for example, the same line as the production line of the transparent plate 1 is provided by attaching equipment for bonding the water vapor barrier transparent film 3 to an extension line of production equipment such as an extruder and a rolling roller for producing the transparent plate 1. A water vapor barrier transparent laminate can be produced continuously in a line.

The transparent plate 1 is preferably continuously formed by an extrusion method or a continuous casting method, and the extrusion method is particularly preferable because it is excellent in productivity.
Here, the extrusion method is generally a production method based on a method of obtaining a resin plate by melting and extruding a pellet-shaped plastic raw material polymer and then cooling and solidifying with a roller.
In addition, the continuous casting method is generally a prepolymerized syrup supplied between a stainless steel belt that is continuously operated in a pair of upper and lower sides, and heat polymerization, heat treatment, cooling and peeling as the belt operates. It is a manufacturing method based on a method of continuously taking out a resin plate from the end through the above-described steps.
As part of the finishing process of the extrusion method or continuous casting method, the operation of stretching using a rolling roller to form a transparent substrate to a constant thickness, the mechanism of the take-up roller for taking up the transparent substrate, etc. It is incorporated as needed.

The method for laminating the water vapor barrier transparent film 3 is not particularly limited, but preferably after the adhesive film is applied in advance to the release film and dried, and the water vapor barrier transparent film 3 is adhered to the adhesive surface. Then, this is wound into a roll bundle to be a take-up roll. And in the production line of the transparent plate 1, while peeling the release film from the water vapor barrier transparent film 3 fed from the take-up roll to expose the adhesive layer, the protective film for transparent plate is taken out from the take-up roll, The water vapor barrier transparent film 3 and the protective film may be simultaneously passed through a pressure roller and bonded to the transparent plate 1.
At this time, it is preferable that the pressure of the pressure roller is appropriately selected in a range that does not impede practically depending on the material of the water vapor barrier transparent film 3 and the transparent plate 1.

  Moreover, it is preferable to perform a series of steps for bonding the water vapor barrier transparent film 3 from the formation of the transparent plate 1 in a dustproof chamber, and static electricity generated when the transparent plate 1 and the water vapor barrier transparent film 3 are bonded is removed. It is preferable to do this. Furthermore, when the water vapor barrier transparent film 3 is bonded, it is preferable that the sheet body is not warped after being bonded to the transparent plate 1 by adjusting the tension of the water vapor barrier transparent film 3.

(Laminated structure)
The water vapor barrier transparent laminate of the present embodiment only needs to have a structure in which the transparent adhesive layer 2 and the water vapor barrier transparent film 3 are sequentially laminated on one side of the transparent plate 1 made of a synthetic resin. Another layer may be provided on the outside of the transparent plate 1 or on the outside of the water vapor barrier transparent film 3. For example, a hard coat film may be laminated on the outside of the transparent plate 1 via an adhesive layer. At this time, it is preferable that the hard coat film has scratch resistance. As a standard of scratch resistance, steel wool # 0000 is reciprocated 10 cm × 10 times on the target surface under a load of 1 kg / cm ^2. It is preferable to have scratch resistance such that no scratches are visually confirmed. When a hard coat film is laminated on the outer side of the transparent plate 1 through an adhesive layer, not only the scratch resistance of the surface can be improved, but also an adhesive layer is formed on both surfaces of the transparent plate 1, so The impact stress can be greatly relieved by these adhesive layers, and the problem of whitening of the end face, which has been a problem when punching out a normal acrylic plate, can be solved.

(Use)
The water vapor barrier transparent laminate according to the present embodiment is subjected to appropriate processing such as surface treatment, decoration, printing, bending, punching, etc. as necessary, for example, a front panel for solar cells, for organic EL It can be used for the production of a member such as a substrate that requires water vapor barrier properties. However, it is not limited to these.
In particular, if the transparent water vapor barrier laminate according to the present embodiment is used, it can be produced in a large amount with a sufficient durability and in practical use with a sufficient yield.

  Examples of the present invention will be described below, but the present invention is not limited to the following examples.

(Example 1: Use of polycarbonate plate and silicon oxide-treated stretch-modified PET film 100 μm)
Stretch-modified PET film 100 μm (product name: Soft Shine A1532, manufactured by Toyobo Co., Ltd.) is vapor-deposited with silicon oxide so as to have a total light transmittance (JIS K7361) of 90% to form a transparent water vapor barrier layer. A water vapor barrier transparent film was prepared.

  Next, using a comma coater, an acrylic adhesive (SK Dyne 1882 manufactured by Soken Chemical Co., Ltd .; recommended addition ratio of curing agent) is applied to the silicon-treated surface of the release film (MRF38 manufactured by Mitsubishi Chemical Polyester Co., Ltd.). The adhesive layer having a thickness of 20 μm was formed by coating and drying, and the non-deposition surface of the water vapor barrier transparent film was layered on the adhesive layer and pasted through a pressure roller. Then, a protective film (Sekisui Chemical Co., Ltd. product 622B) was bonded to the vapor-deposited surface side of the water vapor barrier transparent film and wound into a roll bundle to form a take-up roll.

Next, a polycarbonate plate having a thickness of 2.0 mm is extruded using an extruder and a rolling roller in a dustproof chamber and conveyed onto the production line. On the other hand, the adhesive water vapor barrier transparent film produced as described above is used. The adhesive layer is exposed while peeling off the release film from the take-up roll, the protective film (Sekisui Chemical Co., Ltd. 624A) is fed out on the opposite side of the polycarbonate plate, and the adhesive silicon oxide vapor-deposited film and protective film are bonded to the pressure roller ( A transparent water vapor barrier laminate was obtained by bonding to a transparent plate through a linear pressure of 20 kg / cm).
In addition, when laminating each film on the transparent substrate, the tension balance of the film was adjusted so that the sheet body was not warped.

Regarding the transparency of the polycarbonate plate, the total light transmittance according to JIS K-7105 was 85% or more and the haze was less than 0.5%.
The pressure-sensitive adhesive (SK Dyne 1882 manufactured by Soken Chemical Co., Ltd.) is a two-component cross-linking acrylic pressure-sensitive adhesive having a viscoelasticity of 180 ° C. of 3.1 × 10 ⁵ Pa and an adhesive strength of 412 (N / m). (Stainless steel plate bonding 180 degree peeling), ball tack 11 (J. Dow method, run 50 mm, 23 ° C., 65% RH).
The viscoelasticity of this pressure-sensitive adhesive is as follows: using a viscoelasticity measuring device dynamic analyzer RDAII manufactured by Rheometric Co., Ltd., temperature: 0 to 200 ° C., frequency: 1 Hz, heating rate: 3 ° C./min, strain amount: 2% It is a value measured under conditions and measured by reading the storage elastic modulus G ′ at 180 ° C. (the same applies to the following examples and comparative examples).
Further, the average linear expansion coefficient at 30 ° C. to 60 ° C. of the polycarbonate plate is 8 × 10 ⁻⁵ / ° C., and the average linear expansion coefficient at 30 ° C. to 60 ° C. of the stretch-modified PET film is 6 × 10 ^−5. / ° C.
The linear expansion coefficient was increased from room temperature to 2 ° C./minute while applying a minute load with a thermal stress strain measuring device (TMA-SS / 120C) manufactured by SII Nanotechnology Co., Ltd. The linear expansion coefficient was measured from the temperature dependence of the amount (the same applies to the following examples and comparative examples).

(Example 2: Using acrylic plate and silicon oxide-treated stretch-modified PET film 100 μm)
Stretch-modified PET film 100 μm (product name: Soft Shine A1532, manufactured by Toyobo Co., Ltd.) is vapor-deposited with silicon oxide so that the total light transmittance (JIS K7361) is 90%, thereby forming a transparent water vapor barrier layer. A water vapor barrier transparent film was prepared.

  Next, using a comma coater, an acrylic adhesive (SK Dyne 1882 manufactured by Soken Chemical Co., Ltd .; recommended addition ratio of curing agent) is applied to the silicon-treated surface of the release film (MRF38 manufactured by Mitsubishi Chemical Polyester Co., Ltd.). The adhesive layer having a thickness of 20 μm was formed by coating and drying, and the non-deposition surface of the water vapor barrier transparent film was layered on the adhesive layer and pasted through a pressure roller. Then, a protective film (Sekisui Chemical Co., Ltd. product 622B) was bonded to the vapor-deposited surface side of the water vapor barrier transparent film and wound into a roll bundle to form a take-up roll.

Next, an acrylic plate having a thickness of 2.0 mm is extruded using an extruder and a rolling roller in a dustproof chamber and conveyed onto the production line, while the adhesive water vapor barrier transparent film produced as described above is used. The adhesive layer is exposed while peeling off the release film from the winding roll, the protective film (Sekisui Chemical Co., Ltd. 624A) is fed out on the opposite side of the acrylic plate, and the adhesive silicon oxide vapor deposition film and the protective film are bonded to the pressure roller ( A transparent water vapor barrier laminate was obtained by bonding to an acrylic plate through a linear pressure of 20 kg / cm).
In addition, when each film was laminated on the acrylic plate, the tension balance of the film was adjusted so that the sheet body was not warped.

The acrylic plate is composed mainly of polymethylmeth (a) acrylate (PMMA) resin, and its transparency is such that the total light transmittance according to JIS K-7105 is 90% or more and the haze is less than 0.5%. there were.
The pressure-sensitive adhesive (SK Dyne 1882 manufactured by Soken Chemical Co., Ltd.) is a two-component cross-linking acrylic pressure-sensitive adhesive having a viscoelasticity at 180 ° C. of 3.1 × 10 ⁵ Pa and an adhesive strength of 412 (N / m). (Stainless steel plate bonding 180 degree peeling) and ball tack 11 (J. Dow method, run 50 mm, 23 ° C., 65% RH).
Further, the average linear expansion coefficient at 30 ° C. to 60 ° C. of the acrylic plate is 7 × 10 ⁻⁵ / ° C., and the average linear expansion coefficient of the stretch-modified PET film at 30 ° C. to 60 ° C. is 6 × 10 ^−5. / ° C.

(Comparative Example 1: Using polycarbonate plate and silicon oxide-treated stretched PET film 100 μm)
Silicon oxide is deposited on a stretched PET film 100 μm (product name: O300, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) so that the total light transmittance (JIS K7361) is 90%, thereby forming a transparent water vapor barrier layer. A barrier transparent film was produced.

  Next, using a comma coater, an acrylic adhesive (SK Dyne 1882 manufactured by Soken Chemical Co., Ltd .; recommended addition ratio of curing agent) is applied to the silicon-treated surface of the release film (MRF38 manufactured by Mitsubishi Chemical Polyester Co., Ltd.). The adhesive layer having a thickness of 20 μm was formed by coating and drying, and the non-deposition surface of the water vapor barrier transparent film was layered on the adhesive layer and pasted through a pressure roller. Then, a protective film (Sekisui Chemical Co., Ltd. product 622B) was bonded to the vapor-deposited surface side of the water vapor barrier transparent film and wound into a roll bundle to form a take-up roll.

Next, a polycarbonate plate having a thickness of 2.0 mm is extruded using an extruder and a rolling roller in a dustproof chamber and conveyed onto the production line. On the other hand, the adhesive water vapor barrier transparent film produced as described above is used. The adhesive layer is exposed while peeling off the release film from the take-up roll, the protective film (Sekisui Chemical Co., Ltd. 624A) is fed out on the opposite side of the polycarbonate plate, and the adhesive silicon oxide vapor-deposited film and protective film are bonded to the pressure roller ( A transparent water vapor barrier laminate was obtained by bonding to a polycarbonate plate through a linear pressure of 20 kg / cm).
In addition, when laminating each film on a polycarbonate plate, the tension balance of the film was adjusted so that the sheet body was not warped.

Regarding the transparency of the polycarbonate plate, the total light transmittance according to JIS K-7105 was 85% or more and the haze was less than 0.5%.
The pressure-sensitive adhesive (SK Dyne 1882 manufactured by Soken Chemical Co., Ltd.) is a two-component cross-linking acrylic pressure-sensitive adhesive having a viscoelasticity at 180 ° C. of 3.1 × 10 ⁵ Pa and an adhesive strength of 412 (N / m). (Stainless steel plate bonding 180 degree peeling) and ball tack 11 (J. Dow method, run 50 mm, 23 ° C., 65% RH).
Further, the average linear expansion coefficient at 30 ° C. to 60 ° C. of the polycarbonate plate is 8 × 10 ⁻⁵ / ° C., and the average linear expansion coefficient at 30 ° C. to 60 ° C. of the stretched PET film is 3 × 10 ⁻⁵ / ° C. ° C.

(Comparative Example 2: Use of polycarbonate plate and silicon oxide treated extruded acrylic film 100 μm)
Silicon oxide was vapor-deposited on an extruded acrylic film 100 μm (Mitsubishi Rayon Co., Ltd.) so that the total light transmittance (JIS K7361) was 90% to form a transparent water vapor barrier layer, thereby producing a water vapor barrier transparent film. .

  Next, using a comma coater, an acrylic adhesive (SK Dyne 1882 manufactured by Soken Chemical Co., Ltd .; recommended addition ratio of curing agent) is applied to the silicon-treated surface of the release film (MRF38 manufactured by Mitsubishi Chemical Polyester Co., Ltd.). The adhesive layer having a thickness of 20 μm was formed by coating and drying, and the non-deposition surface of the water vapor barrier transparent film was layered on the adhesive layer and pasted through a pressure roller. Then, a protective film (Sekisui Chemical Co., Ltd. product 622B) was bonded to the vapor-deposited surface side of the water vapor barrier transparent film and wound into a roll bundle to form a take-up roll.

Next, a polycarbonate plate having a thickness of 2.0 mm is extruded using an extruder and a rolling roller in a dustproof chamber and conveyed onto the production line. On the other hand, the adhesive water vapor barrier transparent film produced as described above is used. The adhesive layer is exposed while peeling off the release film from the take-up roll, the protective film (Sekisui Chemical Co., Ltd. 624A) is fed out on the opposite side of the polycarbonate plate, and the adhesive silicon oxide vapor-deposited film and protective film are bonded to the pressure roller ( A transparent water vapor barrier laminate was obtained by bonding to a polycarbonate plate through a linear pressure of 20 kg / cm).
In addition, when laminating each film on a polycarbonate plate, the tension balance of the film was adjusted so that the sheet body was not warped.

Regarding the transparency of the polycarbonate plate, the total light transmittance according to JIS K-7105 was 85% or more and the haze was less than 0.5%.
The pressure-sensitive adhesive (SK Dyne 1882 manufactured by Soken Chemical Co., Ltd.) is a two-component cross-linking acrylic pressure-sensitive adhesive having a viscoelasticity of 180 ° C. of 3.1 × 10 ⁵ Pa and an adhesive strength of 412 (N / m). ) (Stainless steel plate bonding 180 degree peeling), ball tack 11 (J. Dow method, running 50 mm, 23 ° C., 65% RH).
Further, the average linear expansion coefficient at 30 ° C. to 60 ° C. of the polycarbonate plate is 8 × 10 ⁻⁵ / ° C., and the average linear expansion coefficient at 30 ° C. to 60 ° C. of the extruded acrylic film is 7 × 10 ⁻⁵ / ° C. ° C.

(Test and evaluation)
The appearance was visually observed using the product (test sample 30 mm × 240 mm) in Examples 1-2 and Comparative Examples 1-2. The total light transmittance and haze according to JIS K-7105 were measured.
Further, the product was allowed to stand in an environment of 60 ° C. and 60 ° C. × 95% RH for 168 hours to perform a durability test, and the warpage of the laminate was measured. Evaluation is performed as follows, and the results are shown in Table 1.

[appearance]
×: Haze 1% or more and surface defects ○: No surface defects
[Appearance after ring test]
×: Haze 1% or more and surface defects ○: No surface defects

It is sectional drawing which showed an example of the laminated body for nameplate preparation which is an example of embodiment of this invention. It is sectional drawing which showed the other example of the laminated body for nameplate preparation which is an example of embodiment of this invention. It is a schematic diagram which shows an example of the manufacturing line of the laminated body for nameplate preparation of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transparent board 2 Adhesive layer 3 Water vapor barrier transparent film 4 Stretch-modified PET film 5 Transparent water vapor barrier layer

Claims (3)

A water vapor barrier transparent laminate having a laminated structure in which a transparent adhesive layer 2 and a water vapor barrier transparent film 3 are sequentially laminated only on one side of a transparent plate 1 made of a synthetic resin,
The water vapor barrier transparent film 3 has a configuration in which a transparent water vapor barrier layer 5 is laminated on a stretch-modified PET film 4;
The stretch-modified PET film 4 has a water vapor barrier transparent laminate characterized in that a difference from the transparent plate 1 is 3 × 10 ⁻⁵ / ° C. or less in an average linear expansion coefficient at 30 ° C. to 60 ° C. .   The water vapor barrier transparent laminate according to claim 1, wherein the transparent water vapor barrier layer 5 is made of a metal oxide film. The transparent adhesive layer 2 is formed by using an adhesive made of a transparent resin having a viscoelasticity at 180 ° C of 1 × 10 ⁵ Pa to 1 × 10 ⁶ Pa. 3. The water vapor barrier transparent laminate described in 1.

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