JP2002235049A - Adhesive sheet, sheet for filler of solar cell and solar cell using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filler causing slighter deterioration and change in quality than those of EVA resins heretofore most widely used as an adhesive sheet and a filler of a solar cell module. SOLUTION: The adhesive sheet of an ethylenic resin comprises at least >=0.01 mass% of an epoxide copolymerized or added and has the surface coated with an alkoxysilane having amino group and >=80 and <=120 deg.C melting point and >=3×105 Pa shear modulus at 80 deg.C. The sheet is used as the filler for the solar cell. The ethylenic resin may solely be used or laminated to other resin sheets for use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive sheet having excellent durability, and more particularly to an adhesive sheet suitable for a solar cell filler used for fixing cells in a solar cell module and bonding to a back sheet. It relates to a solar cell using the same.

[0002]

2. Description of the Related Art In recent years, solar cells have become widespread as power supply sources. Accordingly, a variety of installation environments and long-term durability have been demanded, and various members used for solar cells have been demanded to have long-term reliability under severe environments.

A filler for a solar cell is one of such members, and is required to have a function as an adhesive and a function to protect a photovoltaic element (cell) from an external impact. (Ethylene-vinyl acetate copolymer)
Resin, PVB (polyvinyl butyral), and silicone resin have been proposed.

Heretofore, as a practical filler, EVA-based resins have been most frequently used from the viewpoints of price, workability, moisture resistance and the like. However, EVA-based batteries, when used for a long period of time, generally undergo deterioration or deterioration such as yellowing, cracking, foaming, etc., which is considered to be one of the causes of a decrease in power generation due to cell corrosion and the like. I was
In addition, similar deterioration and alteration phenomena easily occur when environmental conditions become a little harsher or newly added,
For this reason, applications have been limited.

[0005] These EVA resins cause such deterioration and
Deterioration is caused by the compositional problems such as highly hydrolyzable ester structures, cross-linking agents such as organic peroxides and polyfunctional vinyl compounds added for thermal cross-linking, cross-linking agent residues and reaction products. , An active site such as a higher carbon or a reactive end of an EVA crosslinking point is added in advance with an ultraviolet absorber,
It is presumed that overcoming the suppression effect of the antioxidant and the like, the deterioration and alteration gradually occur.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an adhesive sheet made of an ethylene-based resin having the same performance as that of an EVA-based resin and solving the problem of deterioration and deterioration.

[0007]

That is, the present invention provides the following inventions.

[0008] At least 0.01% by mass or more of an epoxy compound is contained as a copolymer component or an additional component,
A modified ethylene resin sheet having a melting point of 80 ° C. or more and 120 ° C. or less and a shear modulus at 80 ° C. of 3 × 10 ⁵ Pa or more is coated with an alkoxysilane having an amino group on the surface. Adhesive sheet.

[0009] At least 0.01% by mass or more of an epoxy compound is contained as a copolymer component or an additional component,
A modified ethylene resin layer having a melting point of 80 ° C. or more and 120 ° C. or less and a shear modulus at 80 ° C. of 3 × 10 ⁵ Pa or more has a shear modulus at 80 ° C. of 3 × 10 ^5
At least one surface of an ethylene-based resin layer mainly composed of polyethylene or ethylene-α-olefin copolymer of ⁵ Pa or more is laminated and bonded so that a surface coated with an alkoxysilane having an amino group of the sheet appears on the surface. An adhesive sheet comprising a laminated sheet.

The modified ethylene-based resin described in or above, wherein the epoxy compound is a copolymer component of any of polyethylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer or ethylene-acrylate ester copolymer An adhesive sheet comprising a modified ethylene resin contained as an additional component, or a mixture of two or more of them, or a mixture of these with an ethylene resin other than the modified ethylene resin.

It contains at least 0.01% by mass or more of an epoxy compound as a copolymer component or an additional component, has a melting point of 80 ° C. or more and 120 ° C. or less, and
A sheet for filling a solar cell, characterized in that a modified ethylene resin sheet having a shear modulus at 3 ° C. of 3 × 10 ⁵ Pa or more is coated with an alkoxysilane having an amino group on the surface thereof.

It contains at least 0.01% by mass or more of an epoxy compound as a copolymer component or an additional component, and has a melting point of not less than 80 ° C. and not more than 120 ° C .;
Modified ethylene resin layer having a shear modulus at 3 ° C. of 3 × 10 ⁵ Pa or more has a shear modulus at 80 ° C. of 3 × 10 ⁵ Pa.
At least one surface of an ethylene-based resin layer mainly composed of polyethylene or ethylene-α-olefin copolymer of 10 ⁵ Pa or more is laminated and bonded so that the surface coated with an alkoxysilane having an amino group of the sheet appears on the surface. A sheet for a solar cell filler, comprising a laminated sheet comprising:

The modified ethylene resin described in or above, wherein the epoxy compound is a copolymer component of any of polyethylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer or ethylene-acrylate ester copolymer. Or a modified ethylene resin contained as an additional component, or a mixture of two or more thereof,
Alternatively, a sheet for a solar cell filler, comprising a mixture of these and an ethylene-based resin other than the modified ethylene-based resin.

A solar cell, wherein the adhesive sheet according to any one of the above is laminated and adhered to at least a non-light-receiving surface of the solar cell to form a module.
Here, the non-light receiving surface refers to a surface on the opposite side of the light receiving surface of the solar cell.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The modified ethylene resin sheet containing an epoxy compound as a copolymer component or an additional component used in the present invention includes polyethylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid. Ethylene resins such as ester copolymers, grafted with an epoxy compound, or those obtained by copolymerizing an epoxy compound in the course of polymerizing the ethylene resin, or adding a functional group to the ethylene resin or the ethylene resin. And a method of reacting a compound having an epoxy group with the derivative to introduce an epoxy group. However, the method is not limited thereto.

In the present invention, by using an ethylene-based resin such as polyethylene or ethylene-α-olefin copolymer as a base for copolymerization, hydrolysis, which is one of compositional problems in the conventional EVA-based resin, is performed. And substantially no contribution of sexuality, and a favorable result in durability can be obtained. When an ethylene-acrylate copolymer is used, the hydrolyzability can be reduced to a low level, and the durability can be greatly improved. On the other hand, in the case of an ethylene-vinyl acetate copolymer, a deterioration caused by a crosslinking agent or a crosslinking point added for crosslinking in a conventional EVA resin can be suppressed, so that a considerable improvement effect in durability can be obtained. You can play.

In the present invention, various additives such as a light stabilizer, an ultraviolet absorber, an antioxidant, a processing aid, and a crystal nucleating agent are added to the modified ethylene resin within a range not to impair the object of the present invention. Can be added. In particular, when the modified ethylene-based resin does not substantially contain an ethylene-vinyl acetate copolymer, it does not contain a highly hydrolyzable ester structure. Can be added.

In the present invention, the ethylene resin (epoxy-modified ethylene resin) containing an epoxy compound as a copolymer component or an additional component has a melting point of 80 ° C. or higher and 12 ° C. or higher.
Those having a temperature of 0 ° C. or less are used. If the melting point exceeds 120 ° C., the temperature required for bonding increases, and, for example, in the process of assembling the solar cell module, the module cannot be sufficiently heated due to restrictions caused by equipment and other materials. It is not preferable because it does not soften or melt and does not sufficiently adhere to the cell, the light receiving glass, and the back sheet. When the melting point is less than 80 ° C., the adhesive sheet does not have heat resistance. For example, when the adhesive sheet is used as a filler for a solar cell, in an environment where the solar cell module is installed, a shift or peeling due to a decrease in adhesive force occurs. It is not preferable because there is a possibility of it.

The melting point of the modified ethylene resin is determined based on the type and amount of the copolymer component or the additional component, and the ethylene resin containing the epoxy compound used as a mixture component or the additional component as the copolymer component or the additional component, and the epoxy compound. A desired range can be controlled by the melting point, mixing ratio, and the like of the ethylene resin other than the ethylene resin contained as the copolymer component or the additional component. The melting point is based on JIS K7
Value measured according to 121 (highest value if more than one)
And

In the present invention, the epoxy-modified ethylene resin containing an epoxy compound as a copolymer component or an additional component has a shear modulus at 80 ° C. of 3 × 10 ⁵ P
a or more are used. Shear modulus is 3 × 10 ⁵ P
If the value is less than a, the adhesive sheet does not have heat resistance. For example, when the adhesive sheet is used as a filler for a solar cell, the adhesive sheet is unfavorably displaced or peeled off due to a decrease in adhesive strength in an environment where the solar cell module is installed. The shear modulus can be controlled by the melting point of the modified ethylene resin and additives. In the present invention, the shear modulus is a value measured by a normal viscoelasticity measuring device (for example, a dynamic viscoelasticity measuring device manufactured by Iwamoto Seisakusho Co., Ltd.) under conditions of a period of 2πrad and an amplitude distortion of 0.5%.

Since the adhesive sheet of the present invention contains an epoxy compound as a copolymer component or an additional component, the epoxy compound is heated during lamination of the alkoxysilane on the surface layer, during storage, or when the adhered body adheres. Under conditions such as the heating of the fold to be bonded, the reaction bond with the amino group of the alkoxysilane on the surface layer, or the alkoxysilane is superior through a mechanism such as the reaction bond at the alkoxy group with the adherend, It is considered that it exerts adhesive strength.

In the present invention, the epoxy compound used to be incorporated into the ethylene resin by grafting, copolymerization or addition reaction includes glycidyl acrylate, glycidyl methacrylate, epichlorohydrin, and the like.
Bisphenol A cyclohexyl glycidyl ether,
Glycerin triglycidyl ether, 3,4-epoxide cyclohexylmethyl- (3,4-epoxy) cyclohexylcarboxylate and the like are exemplified.

The functional group such as an unsaturated group is added to the target ethylene resin preferably by graft polymerization or reaction addition. The added amount is 0.0
It is not less than 1% by mass, preferably not less than 0.1% by mass, and less than 0.1% by mass is not preferable because, for example, when used as a filler for a solar cell, adhesion to a light-receiving glass and a cell is impaired. Here, the amount of addition can be controlled by the amount or type of the epoxy compound, the reaction temperature and time, the graft reaction conditions such as additives such as catalyst and swelling agent, or the addition reaction.

The addition amount of the epoxy compound is 2
Even if the content is 0% by mass or more, the effect of improving the shear modulus will level off and the price will only increase. Practically, most preferably, it is 0.1 to 15% by mass.

The grafting method is a method in which an epoxy compound is added to an ethylene resin in a solvent and heated in the presence of a radical initiator, and a mixture of the ethylene resin, the epoxy compound and the radical initiator is heated in an extruder. It can be produced by a known method such as a method.

Copolymers of ethylene and unsaturated epoxy compounds among the above epoxy compounds can also be suitably used.

Further, there is also a method of modifying the ethylene resin by adding, for example, bisphenol A cyclohexyl glycidyl ether or the like, which reacts with the functional group, to the ethylene resin modified with a functional group such as maleic anhydride. It can be used as a method for producing a modified ethylene resin.

The desired range can be controlled by the melting point and mixing ratio of the ethylene resin other than the modified ethylene resin containing the epoxy compound as a copolymer component or an additional component. In addition, melting | fusing point is JISK7121.
(In the case of a plurality, the highest value).

In the present invention, the surface of the modified ethylene resin sheet is coated with an alkoxysilane having an amino group (hereinafter sometimes abbreviated as "alkoxysilane"). For example, γ-aminopropyldimethylmethoxysilane, γ-aminopropylmethyldimethoxysilane, γ
-Phenylaminopropyltrimethylmethoxysilane,
γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N- (β-aminoethyl)
-Γ-aminopropylmethyldimethoxysilane, N-
(Β-aminoethyl) -γ-aminopropyltrimethoxysilane and the like.

The coating can be performed by a conventional method such as a roll method and a spray method. That is, a method of directly coating the surface of the modified ethylene resin sheet with alkoxysilane, a method of diluting the solution of the alkoxysilane on the surface of the modified ethylene resin sheet with a solvent, and then coating and drying the solvent, and a light receiving glass in the module forming process. A method in which a solution containing a dispersion of alkoxysilane in a dispersant that does not impair the adhesiveness or light transmittance with a solution is coated with a solution, and then the solvent is dried and volatilized. Similarly, the solution dispersed in the dispersant is polyester or polypropylene. After solvent coating on other films such as, the solvent is dried and volatilized,
Thereafter, a method of thermal transfer to the surface of the modified ethylene-based resin sheet is possible. The coating is preferably performed so that the amount of the alkoxysilane having an amino group is 0.01 to 10 mg / m ² . Here, as the dispersing agent, petroleum resin, terpene resin, coumarone indene type, rosin type, hydrogenated compounds thereof and the like can be used. Heating conditions for drying and thermal transfer in the coating are selected by selecting a temperature and a time at which an alkoxy group of an alkoxysilane having an amino group does not cause a reaction such as hydrolysis or a subsequent condensation reaction. In particular, the thermal transfer in the last-mentioned method can be performed simultaneously with the film formation of an ethylene resin to which an epoxy compound is copolymerized or added.

In the present invention, a sheet in which a modified ethylene resin to which an epoxy compound is copolymerized or added is coated with an alkoxysilane can be used alone as a filler for a solar cell (hereinafter referred to as “filler”). It may be referred to as a “single-layer system”), or may be a laminated sheet with another resin sheet (core material). In this case, at least only the front side (one side) that comes into contact with the cell, the light receiving glass, and the back sheet is a sheet coated with the copolymerized modified ethylene resin with alkoxysilane, and the opposite side (in some cases, the core material side). ) Is polyethylene or ethylene-α-
It may be a laminated sheet in which an ethylene-based resin mainly composed of an olefin copolymer is bonded and laminated. Further, it is also possible to form a laminated sheet laminated on both surfaces of the core material (hereinafter, a laminated sheet).
These are referred to as “laminated systems”. ).

It is to be noted that, as long as the object of the present invention is not impaired, a light stabilizer, an ultraviolet absorber, an antioxidant, a processing aid, etc. may be added to the laminated polyethylene-based resin such as polyethylene or ethylene-α-olefin copolymer. Additives, crystal nucleating agents, etc., which contain substantially no hydrolyzable ester structure, so that various additives including a cross-linking agent within a range not exceeding the degree of deterioration due to the contribution are also included. May be added.

The elastic modulus of the laminated polyethylene or the like is 3 × 10 3 at 80 ° C. for the same reason as the ethylene resin to which the epoxy compound is copolymerized or added.
⁵ Pa or more, and this numerical value can be controlled by the same method as described above.

The modified ethylene-based resin sheet to which the epoxy compound has been copolymerized or added can be obtained by a molding method generally used for thermoplastic resins, such as a general calendar method and an extrusion method.

In the case of a laminated system in which the modified ethylene resin sheet of the present invention is laminated with an ethylene resin mainly comprising an ethylene-α-olefin copolymer or the like, a coextrusion method, an extrusion coating method, A laminated sheet can be obtained by a roll laminating method or the like. The surface of the modified ethylene-based resin sheet may be embossed in order to suppress air bubbles remaining between various layers in the step of processing the module.

The thickness of the modified ethylene resin sheet used in the present invention is not particularly limited, but it is necessary to ensure the fixation of the sheet following the unevenness of the cell and the undulation of the light-receiving glass / back sheet. In consideration of tracking, etc., a single-layer system is usually 50 to 1000 μm, preferably 100 to 100 μm.
６００600 μm. In the case of a laminated system, the total thickness is usually 50 to 1000 μm, preferably 100 to 600 μm.
Wherein the thickness of the modified ethylene resin sheet in which the epoxy compound is copolymerized is 0.1 to 100 μm, preferably 1 to 30 μm.

In order to obtain a solar cell module using the sheet according to the present invention as a filler, in the case of a single-layer system or a multilayer system, the filler itself is subjected to the same process as a conventional filler itself. A solar cell module can be obtained by a modularization process of setting and laminating various members including the above.

Further, the adhesive sheet of the present invention may be laminated on a light-receiving glass in advance, and a solar cell or a back sheet may be laminated on this in a later step.

In the present invention, the conventionally used E
Since the crosslinking step required for the VA-based resin can be omitted, the temperature and time can be reduced accordingly in the modularization step, and the production efficiency can be increased. So also
Since the laminating conditions are mild, stress such as residual stress can be suppressed low, which is advantageous in durability. Furthermore, as compared with the conventional EVA-based resin filler, adverse effects in various environments are suppressed, and as a result, the reliability of the solar cell module is greatly improved.

[0041]

The present invention will be described more specifically with reference to the following examples.

Example 1 (1) 0.5 parts by mass of a hindered amine light stabilizer, 100 parts by mass of an ethylene-glycidyl methacrylate copolymer having a melting point of 103 ° C. and 12 mass% of glycidyl methacrylate, The antioxidant was added in an amount of 0.1 part by mass, and formed into a sheet having a thickness of 300 μm by extrusion at 160 ° C. The shear modulus at 80 ° C. of this sheet was 3 × 10 ⁶ Pa. This sheet was coated with an ethanol solution of γ-aminopropyltriethoxysilane and dried at 80 ° C. for 20 seconds to volatilize the ethanol. Sheet 1 coated with γ-aminopropyltriethoxysilane to a thickness of 0.01 μm was obtained. I got
This sheet 1 was used as an adhesive sheet 1 for evaluation.

(2) Assuming a solar cell, a 0.3 mm-thick aluminum plate was used as an alternative, and an evaluation sample was assembled. That is, a float glass (= light receiving glass) having a thickness of 3 mm, the adhesive sheet 1 having a thickness of 0.3 mm, an aluminum plate having a thickness of 0.3 mm (alternative to a cell), and an adhesive sheet having a thickness of 0.3 mm 1, 0.0
Set the order of 8mm-thick surface easy-adhesion treated polyvinyl fluoride / aluminum foil laminated film (= back sheet) in order, heat and pressure process at 130 ° C for 20 minutes in a heat-resistant rubber bag, and assume a solar cell module The following various durability tests and evaluations were performed on the evaluation samples thus obtained. 2000-hour standing treatment with a sunshine weather meter 2000-hour standing treatment at 85 ° C. and 85% RH atmosphere (according to JIS C8917) 200-hour standing treatment at 23 ° C. in a 10% aqueous sodium hydroxide solution (according to JIS K7114) After each of the treatments (1) to (3), visually, (i) the presence or absence of yellowing, cracks, or foaming of the filler layer, (ii) the presence or absence of peeling from the glass / back sheet, and (iii) the presence or absence of corrosion of the aluminum plate.
The following three-step evaluation was performed by comparing 18 items in total with 6 items for each species before the treatment. ◎: A slight change occurred in the comparison of 18 items within 10 items, and there was no significant change. ：: Slight changes occurred in 11 or more items in comparison of 18 items, and there was no significant change. ×: One or more significant changes were found in the comparison of 18 items. As a result, the evaluation when the adhesive sheet 1 was used as a filler was found to be ◎.

(Example 2) (1) Modified weight obtained by adding 2.0 parts by mass of bisphenol A diglycidyl ether to 100 parts by mass of low-density polyethylene grafted with 0.5% by mass of maleic anhydride at a melting point of 104 ° C. The coalesced was extruded at 180 ° C to a thickness of 30
It was formed into a sheet of 0 μm. The shear modulus at 80 ° C. of this sheet was 3.2 × 10 ⁶ Pa. This sheet was coated with an ethanol solution of γ-aminopropyltriethoxysilane in the same manner as in Example 1 and dried, and γ-aminopropyltriethoxysilane was coated at 0.01 μm.
To obtain an adhesive sheet 2 coated to a thickness of. The adhesive sheet 2 was evaluated as a filler for a modified ethylene resin for evaluation.

(2) With respect to the sheet 2, an evaluation sample corresponding to a solar cell module was prepared in the same manner as in Example 1, and a durability test was performed and evaluated in the same manner. As a result,
The evaluation when the adhesive sheet 2 was used as a filler was:
◎ was found.

(Example 3) (1) The ethylene-glycidyl methacrylate copolymer copolymerized in the melting point of 103 ° C. and 12% by mass of glycidyl methacrylate used in Example 1 was used on both surface layers, melting point of 112.
A low-density polyethylene having a shear modulus of 1.3 × 10 ⁷ Pa at 80 ° C. and 1.3 × 10 ⁷ Pa was used as a core, and two types and three layers of a sheet 3 were formed at 180 ° C. by a coextrusion method. The adhesive sheet 3 was manufactured by coating 0.01 μm of γ-aminopropyltriethoxysilane in the same manner as in Example 1. The thickness of the adhesive sheet 3 on the surface side is 25 μm each, the thickness on the core side is 300 μm, and the total thickness is 350 μm.
Met.

(2) Example 1 of Adhesive Sheet 3
A sample for evaluation corresponding to a solar cell module was prepared in the same manner as described above, and a durability test was performed and evaluated in the same manner.

As a result, the evaluation when the adhesive sheet 3 was used as a filler was found to be ◎.

(Comparative Example 1) A commercially available thermally crosslinkable EVA sheet (thickness: 400 µm) was subjected to vacuum heating and pressure processing in a heat-resistant rubber bag at 130 ° C for 20 minutes and then in an oven at 150 ° C. Except that the EVA was crosslinked by heating for 20 minutes in the same manner as in Example 1 except that a sample for evaluation corresponding to a solar cell module was prepared, and a durability test was performed and evaluated in the same manner.

As a result, it was found that the evaluation when the thermally crosslinkable EVA sheet was used as the filler was x.

Comparative Example 2 (1) Melting point: 103 ° C., 100 parts by mass of an ethylene-glycidyl methacrylate copolymer obtained by copolymerizing 12% by mass of glycidyl methacrylate, 0.5 part by mass of a hindered amine-based light stabilizer, and phenol-based compound The antioxidant was added in an amount of 0.1 part by mass, and formed into a sheet having a thickness of 300 μm by extrusion at 180 ° C. The shear modulus at 80 ° C. of this sheet was 3 × 10 ⁶ Pa. The sheet was not coated with alkoxysilane.

(2) For this sheet, an evaluation device corresponding to a solar cell module was prepared in the same manner as in Example 1, and a durability test was performed and evaluated in the same manner.

As a result, when the sheet 4 was used as the filler, the evaluation was x.

Comparative Example 3 (1) Bisphenol A diglycidyl ether based on 100 parts by weight of an epoxy compound-modified ethylene-α-olefin copolymer having a melting point of 122 ° C. and a maleic anhydride content of 0.5% by weight. Was added at 2.0 parts by mass and extruded at 180 ° C. to form a sheet having a thickness of 300 μm. This sheet has a shear modulus at 80 ° C. of 4.
It was 1 × 10 ⁷ Pa. In addition, the sheet is the same as in the first embodiment.
In the same manner as in the above, a 0.01 μm coating of γ-aminopropyltriethoxysilane was performed.

(2) With respect to this sheet, a sample for evaluation corresponding to a solar cell module was prepared in the same manner as in Example 1, and a durability test was performed and evaluated in the same manner.

As a result, when the sheet 5 was used as the filler, the evaluation was x.

Comparative Example 4 (1) 0.5 parts by mass of a hindered amine light stabilizer per 100 parts by mass of an ethylene-acrylic acid copolymer having a melting point of 75 ° C. and an acrylic acid content of 25% by mass, and a phenolic antioxidant 0.1 parts by mass of the agent was added, and formed into a sheet having a thickness of 300 μm by extrusion at 120 ° C. 80 ° C of this sheet
Was 1.7 × 10 ⁵ . This sheet was coated with an ethanol solution of γ-aminopropyltriethoxysilane and dried in the same manner as in Example 1 to obtain 0.01 μm of γ-aminopropyltriethoxysilane.
Thus, a sheet 6 coated to a thickness of m was obtained.

(2) For this sheet 6, an evaluation device equivalent to a solar cell module was prepared in the same manner as in Example 1.
A durability test was performed and evaluated in the same manner.

As a result, when the sheet 6 was used as the filler, the evaluation was x.

[0060]

According to the filler for a solar cell of the present invention,
In the modularization process, it is possible to reduce the temperature and time in a short time, so that the production efficiency is increased. In addition, since gentle laminating conditions are used, stresses such as residual stress are suppressed, which is advantageous in durability. . As described above, the filler mainly composed of the ethylene resin copolymerized with the epoxy compound of the present invention can suppress the adverse effects under various environments as compared with the conventional EVA resin filler. This has the effect of greatly improving the reliability of the battery module.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of the solar cell of the present invention.

FIG. 2 is a schematic sectional view showing another example of the solar cell of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 solar cell filler sheet 2 light receiving glass 3 solar cell 30 non-light receiving surface 31 light receiving surface 4 back sheet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09J 123/26 C09J 123/26 H01L 31/04 C08L 23:08 // C08L 23:08 H01L 31/04 F F-term (reference) 4F006 AA12 AA13 AB52 AB67 BA01 CA05 CA08 DA04 4F100 AH02A AH03B AH06B AK04A AK04C AK25 AK62C AL01A AL06A BA03 BA07 BA10B CA01B CA05 CA06 EH46B GB41 JA04A JK07A J01A04 Y03A01 Y12A03 JA09 NA19 5F051 EA18 JA04 JA05

Claims (7)

[Claims] 1. An epoxy compound containing at least 0.01% by mass or more of an epoxy compound as a copolymer component or an additional component.
A modified ethylene resin sheet having a melting point of 80 ° C. or more and 120 ° C. or less and a shear modulus at 80 ° C. of 3 × 10 ⁵ Pa or more is coated with an alkoxysilane having an amino group on the surface. Adhesive sheet. 2. An epoxy compound containing at least 0.01% by mass or more as a copolymer component or an additional component,
A modified ethylene resin layer having a melting point of 80 ° C. or more and 120 ° C. or less and a shear modulus at 80 ° C. of 3 × 10 ⁵ Pa or more has a shear modulus at 80 ° C. of 3 × 10 ^5
At least one surface of an ethylene-based resin layer mainly composed of polyethylene or ethylene-α-olefin copolymer of ⁵ Pa or more is laminated and bonded so that a surface coated with an alkoxysilane having an amino group of the sheet appears on the surface. An adhesive sheet comprising a laminated sheet. 3. The modified ethylene resin according to claim 1, wherein the modified ethylene resin is polyethylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, or ethylene-ethylene copolymer.
A modified ethylene resin in which an epoxy compound is contained as a copolymerization component or an additional component in any of the acrylate ester copolymers, or a mixture of two or more of these, or an ethylene other than the modified ethylene resin. An adhesive sheet comprising a mixture with a resin. 4. It contains at least 0.01% by mass or more of an epoxy compound as a copolymer component or an additional component,
A modified ethylene resin sheet having a melting point of 80 ° C. or more and 120 ° C. or less and a shear modulus at 80 ° C. of 3 × 10 ⁵ Pa or more is coated with an alkoxysilane having an amino group on the surface. For filling solar cells. 5. An epoxy compound containing at least 0.01% by mass or more of an epoxy compound as a copolymer component or an additional component,
A modified ethylene resin layer having a melting point of 80 ° C. or more and 120 ° C. or less and a shear modulus at 80 ° C. of 3 × 10 ⁵ Pa or more has a shear modulus at 80 ° C. of 3 × 10 ^5
At least one surface of an ethylene-based resin layer mainly composed of polyethylene or ethylene-α-olefin copolymer of ⁵ Pa or more is laminated and bonded so that a surface coated with an alkoxysilane having an amino group of the sheet appears on the surface. A sheet for a solar cell filler, comprising a laminated sheet. 6. The modified ethylene-based resin according to claim 1, wherein the modified ethylene-based resin is polyethylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer or ethylene-
A modified ethylene resin in which an epoxy compound is contained as a copolymerization component or an additional component in any of the acrylate ester copolymers, or a mixture of two or more of these, or an ethylene other than the modified ethylene resin. A sheet for a solar cell filler, comprising a mixture with a base resin. 7. A solar cell, wherein the solar cell filler sheet according to claim 4 is laminated and adhered to at least a non-light-receiving surface of a solar cell to form a module.