JP2018145068A - Intermediate film for glass laminate, glass laminate, and glass laminate system - Google Patents

Abstract

An object of the present invention is to generate heat by applying a voltage to a heat generating layer, particularly to quickly warm a frozen surface of glass, thereby melting frost and ice, and exhibiting high penetration resistance. An interlayer film for laminated glass, a laminated glass using the interlayer film for laminated glass, and the laminated glass system are provided. An intermediate film for laminated glass having a heat generating layer, and a first resin layer and a second resin layer laminated on both surfaces of the heat generating layer, wherein the heat capacity of the first resin layer is C1. For laminated glass, the ratio C1 / C2 of the heat capacity C2 of the second resin layer is 1.1 or more, and the total thickness of the first resin layer and the second resin layer is 500 μm or more Interlayer film. [Selection] Figure 1

Description

The present invention generates heat by applying a voltage to the heat generating layer, and particularly can quickly warm the surface on the frozen side of the glass to melt frost and ice, and exhibit high penetration resistance. The present invention relates to an interlayer film for laminated glass, a laminated glass using the interlayer film for laminated glass, and the laminated glass system.

Laminated glass is excellent in safety because it has less scattering of glass fragments even if it is damaged by external impact. For this reason, it is widely used for automobiles and buildings.
In recent years, the performance required for laminated glass has also diversified, and a technique for heating a laminated glass itself to warm a frozen window glass and melting frost and ice has been studied.

As one method for heating the laminated glass itself, a method is considered in which a conductive film is formed on the glass surface of the laminated glass and the laminated glass is warmed by heat generated from resistance during energization. Laminated glass on which such a conductive film is formed is disclosed in, for example, Patent Document 1 and the like.
On the other hand, as one method of heating the laminated glass itself, a method of laminating a heat generating layer made of a conductive film on an interlayer film for laminated glass has been studied. Such an interlayer film for laminated glass is usually produced by a method of laminating a resin layer containing a thermoplastic resin such as polyvinyl acetal on the heat generating layer.
However, it is necessary to warm a frozen window glass using such a heat-generating laminated glass and melt frost and ice. There has been a demand for melting frost and ice efficiently in a shorter time.

JP 2008-222513 A

In view of the above situation, the present invention generates heat by applying a voltage to the heat generating layer, and particularly can quickly warm the frozen surface of the glass to melt frost and ice, and has high penetration resistance. It is an object to provide an interlayer film for laminated glass capable of exhibiting the above, a laminated glass using the interlayer film for laminated glass, and the laminated glass system.

The present invention is an interlayer film for laminated glass having a heat generating layer, and a first resin layer and a second resin layer laminated on both surfaces of the heat generating layer, wherein the heat capacity C1 of the first resin layer is For laminated glass, the ratio C1 / C2 of the heat capacity C2 of the second resin layer is 1.1 or more, and the total thickness of the first resin layer and the second resin layer is 500 μm or more It is an interlayer film.
The present invention is described in detail below.

As a result of intensive studies, the inventors of the present invention have made it possible to reduce the heat capacity of the resin layer by reducing the thickness of the interlayer film for laminated glass having the heat generating layer and the resin layer laminated on the heat generating layer. It was found that the heat from the heat generation layer can be transmitted more quickly, the glass can be warmed faster, and frost and ice can be melted. However, when the thickness of the resin layer is reduced in this way, it becomes difficult to satisfy the basic performance required for the interlayer film for laminated glass, such as penetration resistance.
As a result of further intensive studies, the inventors laminated the first resin layer and the second resin layer on both sides of the heat generation layer, and the heat capacity C1 of the first resin layer and the heat capacity C2 of the second resin layer. By setting the ratio C1 / C2 to 1.1 or more, heat from the heat generating layer can be transferred more quickly on the second resin layer side having a small heat capacity, so that the second resin layer side is on the outside. It has been found that if it is placed in an automobile or a building, the glass can be warmed more quickly and frost and ice can be melted. And in that case, the basic performance required for the interlayer film for laminated glass, such as penetration resistance, may be satisfied by making the total thickness of the first resin layer and the second resin layer more than a certain value. The present invention has been completed by finding out what can be done.

The interlayer film for laminated glass of the present invention has a heat generating layer and a first resin layer and a second resin layer laminated on both surfaces of the heat generating layer.
The heat generating layer generates heat by applying a voltage, warms the frozen glass, and melts frost and ice.
The heat generating layer preferably has a surface resistivity of 10Ω / □ or less. The heat generating layer having a surface resistivity of 10Ω / □ or less can sufficiently generate heat by applying a voltage, warm the frozen glass, and melt frost and ice. More preferably 5Ω / □ or less, still more preferably 3.3Ω / □ or less, and particularly preferably 2Ω / □ or less.

The heat generating layer is preferably composed of a single layer or a plurality of layers made of a metal having a low electrical resistivity such as gold, silver, copper, or platinum. By including these metals having low electrical resistivity, sufficient heat generation can be obtained when a voltage is applied.
In the present specification, a metal having a low electrical resistivity means a metal or alloy having an electrical resistivity of 1 × 10 ⁻⁶ Ωm or less. Here, examples of the metal or alloy having an electrical resistivity of 1 × 10 ⁻⁷ Ωm or more and less than 1 × 10 ⁻⁶ Ωm include platinum, iron, tin, chromium, lead, titanium, mercury, stainless steel, and the like. . Examples of the metal or alloy having an electrical resistivity of less than 1 × 10 ⁻⁷ Ωm include gold, silver, copper, aluminum, magnesium, tungsten, cobalt, zinc, nickel, potassium, lithium, brass, and the like.

The thickness of the heat generating layer is not particularly limited, but is preferably 15 nm or more. By setting the thickness of the heat generating layer to 15 nm or more, it is possible to sufficiently generate heat by applying a voltage to the heat generating layer, warm the frozen glass, and melt frost and ice. The thickness of the heat generating layer is preferably 20 nm or more, and more preferably 25 nm or more.
Although the upper limit of the thickness of the heat generating layer is not particularly limited, the upper limit is substantially about 1000 nm.

The heat generating layer may have a transparent conductive layer or a metal oxide layer laminated on at least one surface. By using these transparent conductive layers and metal oxide layers, the transparency of the obtained interlayer film for laminated glass and laminated glass can be enhanced.
The transparent conductive layer is preferably made of tin-doped indium oxide (ITO), fluorine-doped tin oxide (FTO), antimony-doped tin oxide (ATO), or the like because of its transparency and low electrical resistivity.
The metal oxide layer, for example, titanium oxide _(TiO 2), niobium oxide _{(Nb 2 O} 5), include those consisting of such as silicon oxide (SiO _2).
These transparent conductive layers and metal oxide layers may be used alone or in combination of two or more. Among these, a transparent conductive layer made of ITO or ATO, or a metal oxide layer made of at least one selected from the group consisting of titanium oxide and niobium oxide is preferable.

Although the thickness of the said transparent conductive layer and a metal oxide layer is not specifically limited, A preferable minimum is 20 nm and a preferable upper limit is 300 nm. The more preferable lower limit of the thickness of the transparent conductive layer or the metal oxide layer is 25 nm, and the more preferable upper limit is 100 nm.

When the metal oxide layer is combined with a heat generation layer containing silver, if a metal oxide layer is formed on the heat generation layer by a method such as sputtering, a part of the silver on the surface of the heat generation layer is oxidized. As a result, a layer made of silver oxide having low transparency may be formed. In such a case, it is preferable to provide an oxygen-deficient metal oxide layer containing an oxygen deficiency of the metal oxide between the heat generation layer and the metal oxide layer. By providing such an oxygen-deficient metal oxide layer, oxidation of the surface of the heat generating layer can be prevented and higher transparency can be exhibited.
The oxygen-deficient metal oxide layer is formed, for example, by performing sputtering under a condition in which oxygen is less than theoretically forming a metal oxide layer when the metal oxide layer is formed by sputtering. Can do.

The heat generating layer may be formed on a substrate. In the case of forming the heat generating layer on the substrate, a uniform heat generating layer can be formed by a sputtering process or the like.
It is preferable that the base material has a heat shrinkage ratio after heat treatment at 150 ° C. for 30 minutes measured in accordance with JIS C2151 of 1.0 to 3.5% in both MD and TD directions. By using a base material having such a heat shrinkage rate, a uniform heat generation layer can be formed by a sputtering process or the like, and a difference occurs between the heat generation rate and the first surface due to a difference in heat shrinkage rate when manufacturing laminated glass. Can be prevented, and the adhesion between the heat generating layer and the first resin layer can be improved. A more preferable lower limit of the heat shrinkage rate is 1.5%, and a more preferable upper limit is 3.0%.
In addition, in this specification, MD direction (Machine Direction) means the extrusion direction at the time of extruding a base material in a sheet form, and TD direction (Transverse Direction) means a direction perpendicular to the MD direction.

The base material preferably has a Young's modulus of 1 GPa or more. By using a base material having a Young's modulus of 1 GPa or more, the adhesiveness with the first resin layer or the second resin layer can be further improved. The Young's modulus of the substrate is more preferably 1.5 GPa or more, and further preferably 2 GPa or more. A preferable upper limit of the Young's modulus of the substrate is 10 GPa.
The Young's modulus is obtained by obtaining a strain-stress curve at 23 ° C. by a tensile test based on JIS K7127, and is indicated by the slope of the linear portion of the strain-stress curve.
In addition, it is preferable that the Young's modulus of the 1st resin layer and 2nd resin layer which are mentioned later is generally less than 1 GPa.

The base material preferably contains a thermoplastic resin. Examples of the thermoplastic resin contained in the substrate include chain polyolefins such as polyethylene, polypropylene, poly (4-methylpentene-1), and polyacetal, ring-opening metathesis polymers or addition polymers of norbornenes, and norbornenes. Alicyclic polyolefins such as addition copolymers with other olefins, biodegradable polymers such as polylactic acid and polybutyl succinate, polyamides such as nylon 6, nylon 11, nylon 12 and nylon 66, and aramid And polymethyl methacrylate, polyvinyl chloride, polyvinylidene chloride, polystyrene, styrene copolymer polymethyl methacrylate, polycarbonate, polypropylene terephthalate, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyethylene Polyester such as 2,6-naphthalate, polyether sulfone, polyether ether ketone, modified polyphenylene ether, polyphenylene sulfide, polyether imide, polyimide, polyarylate, tetrafluoroethylene resin, Examples thereof include a trifluoroethylene resin, a trifluoroethylene chloride resin, a tetrafluoroethylene-6fluoropropylene copolymer, and polyvinylidene fluoride. These thermoplastic resins are adjusted singly or in combination of two or more so that the heat shrinkage rate and Young's modulus are within the expected ranges.

The said base material may contain conventionally well-known additives, such as a ultraviolet-ray shielding agent and antioxidant, as needed.
Examples of the ultraviolet shielding agent include an ultraviolet shielding agent containing a metal, an ultraviolet shielding agent containing a metal oxide, an ultraviolet shielding agent having a benzotriazole structure, an ultraviolet shielding agent having a benzophenone structure, and an ultraviolet shielding agent having a triazine structure. Conventionally known ultraviolet shielding agents such as an ultraviolet shielding agent having a malonic ester structure, an ultraviolet shielding agent having an oxalic acid anilide structure, and an ultraviolet shielding agent having a benzoate structure can be used.
As said antioxidant, conventionally well-known antioxidants, such as antioxidant which has a phenol structure, antioxidant containing sulfur, antioxidant containing phosphorus, can be used, for example.

The thickness of the said base material is not specifically limited, A preferable minimum is 10 micrometers and a preferable upper limit is 200 micrometers. When the thickness of the base material is within this range, a uniform heat generation layer can be formed by using a sputtering process or the like, and the heat generation layer and the first resin layer or the second resin layer are produced at the time of manufacturing laminated glass. It is possible to prevent deviation from occurring on the surface of the film, and to further improve the adhesion between the heat generating layer and the first resin layer or the second resin layer. The minimum with more preferable thickness of the said base material is 20 micrometers, and a more preferable upper limit is 150 micrometers.

The method for forming the heat generating layer on the substrate is not particularly limited, and conventionally known methods such as a sputtering process, ion plating, plasma CVD process, vapor deposition process, coating process, and dip process can be used. Among these, a sputtering process is preferable because a uniform heat generation layer can be formed.

When the heat generating layer is formed on a substrate, the heat after heat treatment at 150 ° C. for 30 minutes is measured according to JIS C2151 of the first resin layer or the second resin layer in direct contact with the substrate. The absolute value of the difference between the shrinkage rate and the heat shrinkage rate after heat treatment for 30 minutes at 150 ° C. measured in accordance with JIS C2151 of the substrate is preferably 10% or less in both MD and TD directions. By making the absolute value of the difference in thermal shrinkage between the resin layer and the substrate in direct contact with each other to 10% or less, it is possible to prevent deviation between the resin layer and the heat generating layer during the production of laminated glass. And the resin layer can be further improved in adhesion. The absolute value of the difference in thermal shrinkage between the resin layer and the substrate is more preferably 8% or less.
The heat shrinkage rate of the first resin layer or the second resin layer should be adjusted by the type of thermoplastic resin constituting the resin layer, the type and amount of the plasticizer, and the annealing conditions. Can do.

The interlayer film for laminated glass of the present invention has a first resin layer and a second resin layer laminated on both surfaces of the heat generating layer. Here, a ratio C1 / C2 between the heat capacity C1 of the first resin layer and the heat capacity C2 of the second resin layer is 1.1 or more. Thus, by providing a difference between the heat capacities of the first resin layer and the second resin layer, heat from the heat generating layer can be transmitted more quickly on the second resin layer side having a smaller heat capacity. Thereby, if it arrange | positions in a motor vehicle, a building, etc. so that the 2nd resin layer side may become an outer side, glass can be warmed earlier and frost and ice can be melted. Or if it arrange | positions in a motor vehicle, a building, etc. so that the 2nd resin layer side may become an inner side, the cloudiness of glass can also be dropped earlier. The ratio C1 / C2 is preferably 1.3 or more, and more preferably 1.5 or more.
The upper limit of the ratio C1 / C2 is not particularly limited, but substantially the upper limit is about 20.

The heat capacity of the resin layer is determined by the product of the mass of the resin layer and the specific heat. Therefore, by adjusting the mass of the resin layer (substantially the thickness of the resin layer), adjusting the type of resin used in the resin layer, and the type and amount of additives blended in the resin layer, The heat capacity of the layer can be adjusted. That is, the ratio C1 / C2 can be adjusted to 1.1 or more by adjusting the thickness of the first resin layer and the second resin layer, the type of resin, and the type and amount of the additive. . In particular, the heat capacity can be easily reduced by adding a heat ray absorbent described later to the resin layer.
In addition, it is preferable to measure the specific heat of a resin layer according to the following conditions, for example using differential scanning calorimetry (DSC). That is, using a differential scanning calorimeter (for example, “DSC 3500 Sirius” manufactured by NETZSCH, etc.), a temperature range of −40 ° C. to 100 ° C., a cooling / heating rate of 10 ° C./min, and a standard atmosphere The value at 20 ° C. when measurement is performed using sapphire as a substance is adopted as the specific heat.

The first resin layer and the second resin layer preferably contain a thermoplastic resin. Examples of the thermoplastic resin include polyvinylidene fluoride, polytetrafluoroethylene, vinylidene fluoride-hexafluoropropylene copolymer, polytrifluoride ethylene, acrylonitrile-butadiene-styrene copolymer, polyester, polyether, Polyamide, polycarbonate, polyacrylate, polymethacrylate, polyvinyl chloride, polyethylene, polypropylene, polystyrene, polyvinyl acetal, ethylene-vinyl acetate copolymer, polyoxymethylene (or polyacetal) resin, acetoacetal resin, polyvinylbenzyl acetal resin, A polyvinyl cumin acetal resin etc. are mentioned. Especially, it is preferable that the said resin layer contains a polyvinyl acetal or an ethylene-vinyl acetate copolymer, and it is more preferable to contain a polyvinyl acetal.

The polyvinyl acetal is not particularly limited as long as it is a polyvinyl acetal obtained by acetalizing polyvinyl alcohol with an aldehyde, but polyvinyl butyral is preferable. Moreover, you may use together 2 or more types of polyvinyl acetal as needed.

The preferable lower limit of the degree of acetalization of the polyvinyl acetal is 40 mol%, the preferable upper limit is 85 mol%, the more preferable lower limit is 60 mol%, and the more preferable upper limit is 75 mol%.
The polyvinyl acetal has a preferred lower limit of the amount of hydroxyl groups of 15 mol% and a preferred upper limit of 40 mol%. Adhesiveness between the interlayer film for laminated glass and the glass is increased when the amount of the hydroxyl group is 15 mol% or more. When the hydroxyl group amount is 40 mol% or less, handling of the interlayer film for laminated glass becomes easy.
The degree of acetalization and the amount of hydroxyl groups can be measured in accordance with, for example, JIS K6728 “Testing method for polyvinyl butyral”.

The polyvinyl acetal can be prepared by acetalizing polyvinyl alcohol with an aldehyde.
The polyvinyl alcohol is usually obtained by saponifying polyvinyl acetate, and polyvinyl alcohol having a saponification degree of 70 to 99.9 mol% is generally used. The saponification degree of the polyvinyl alcohol is preferably 80 to 99.9 mol%.
The preferable lower limit of the polymerization degree of the polyvinyl alcohol is 500, and the preferable upper limit is 4000. When the polymerization degree of the polyvinyl alcohol is 500 or more, the penetration resistance of the obtained laminated glass is increased. When the polymerization degree of the polyvinyl alcohol is 4000 or less, the interlayer film for laminated glass can be easily molded. The minimum with a more preferable polymerization degree of the said polyvinyl alcohol is 1000, and a more preferable upper limit is 3600.

The aldehyde is not particularly limited, but generally an aldehyde having 1 to 10 carbon atoms is preferably used. The aldehyde having 1 to 10 carbon atoms is not particularly limited. For example, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexylaldehyde, n-octylaldehyde, n-nonylaldehyde N-decyl aldehyde, formaldehyde, acetaldehyde, benzaldehyde, polyvinyl benzyl aldehyde, polyvinyl cumin aldehyde and the like. Of these, n-butyraldehyde, n-hexylaldehyde, and n-valeraldehyde are preferable, and n-butyraldehyde is more preferable. These aldehydes may be used alone or in combination of two or more.

The first resin layer and the second resin layer preferably contain a plasticizer. The plasticizer is not particularly limited, and examples thereof include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic phosphorous acid plasticizers, and the like. Is mentioned. The plasticizer is preferably a liquid plasticizer.

The monobasic organic acid ester is not particularly limited. For example, glycols such as triethylene glycol, tetraethylene glycol, and tripropylene glycol, butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptylic acid, and n-octyl Examples thereof include glycol esters obtained by reaction with monobasic organic acids such as acid, 2-ethylhexyl acid, pelargonic acid (n-nonyl acid), and decyl acid. Of these, triethylene glycol dicaproate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-n-octylate, triethylene glycol di-2-ethylhexylate and the like are preferable.

Although the said polybasic organic acid ester is not specifically limited, For example, ester compound of polybasic organic acid, such as adipic acid, sebacic acid, azelaic acid, and the alcohol which has a C4-C8 linear or branched structure Is mentioned. Of these, dibutyl sebacic acid ester, dioctyl azelaic acid ester, dibutyl carbitol adipic acid ester and the like are preferable.

The organic ester plasticizer is not particularly limited, and triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, triethylene glycol di-n-octanoate, Triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, tetraethylene glycol di-2-ethylhexanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethyl Butyrate, 1,3-propylene glycol di-2-ethyl butyrate, 1,4-butylene glycol di-2-ethyl butyrate, diethylene glycol di-2-ethyl butyrate, diethylene glycol di- -Ethyl hexanoate, dipropylene glycol di-2-ethyl butyrate, triethylene glycol di-2-ethyl pentanoate, tetraethylene glycol di-2-ethyl butyrate, diethylene glycol dicapryate, dihexyl adipate, adipine Dioctyl acid, hexyl cyclohexyl adipate, diisononyl adipate, heptylnonyl adipate, dibutyl sebacate, oil-modified sebacic acid alkyd, a mixture of phosphate ester and adipic acid ester, adipic acid ester, alkyl alcohol having 4 to 9 carbon atoms and Examples thereof include mixed adipic acid esters prepared from cyclic alcohols having 4 to 9 carbon atoms and adipic acid esters having 6 to 8 carbon atoms such as hexyl adipate.

The organophosphate plasticizer is not particularly limited, and examples thereof include tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphate, and the like.

Furthermore, since it is difficult to cause hydrolysis as the plasticizer, triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH), tetraethylene glycol di-2- It preferably contains ethyl hexanoate (4GO) and dihexyl adipate (DHA), and tetraethylene glycol di-2-ethylhexanoate (4GO) and triethylene glycol di-2-ethylhexanoate (3GO). More preferably, it contains triethylene glycol di-2-ethylhexanoate, more preferably.

The content of the plasticizer in the first resin layer and the second resin layer is not particularly limited, but a preferable lower limit with respect to 100 parts by weight of the polyvinyl acetal is 30 parts by weight, and a preferable upper limit is 90 parts by weight. When the content of the plasticizer is 30 parts by weight or more, the melt viscosity of the laminated glass interlayer film is lowered, and the degassing property when the laminated glass is produced using this laminated glass interlayer film is increased. When the content of the plasticizer is 90 parts by weight or less, the transparency of the interlayer film for laminated glass increases. The minimum with more preferable content of the said plasticizer is 35 weight part, a more preferable upper limit is 70 weight part, and a still more preferable upper limit is 63 weight part.
In addition, when content of the said plasticizer shall be 55 weight part or more, the sound insulation excellent in this resin layer can be provided.
The content of the plasticizer may be the same or different between the first resin layer and the second resin layer.

The first resin layer and the second resin layer preferably contain an adhesive strength modifier. By containing the adhesive strength adjusting agent, the adhesive strength to glass can be adjusted, and a laminated glass excellent in penetration resistance can be obtained.
As said adhesive force regulator, at least 1 sort (s) selected from the group which consists of an alkali metal salt, alkaline-earth metal salt, and magnesium salt, for example is used suitably. As said adhesive force regulator, salts, such as potassium, sodium, magnesium, are mentioned, for example.
Examples of the acid constituting the salt include organic acids of carboxylic acids such as octylic acid, hexylic acid, 2-ethylbutyric acid, butyric acid, acetic acid, formic acid, and inorganic acids such as hydrochloric acid and nitric acid.

When heat-shielding property is requested | required of the intermediate film for laminated glasses of this invention, the said 1st resin layer and / or 2nd resin layer may contain a heat ray absorber.
The heat ray absorber is not particularly limited as long as it has the ability to shield infrared rays. However, tin-doped indium oxide (ITO) particles, antimony-doped tin oxide (ATO) particles, aluminum-doped zinc oxide (AZO) particles, and indium-doped zinc oxide. At least one selected from the group consisting of (IZO) particles, tin-doped zinc oxide particles, silicon-doped zinc oxide particles, cesium-doped tungsten oxide (CWO) particles, lanthanum hexaboride particles, and cerium hexaboride particles is preferred. .

The ratio C1 / C2 can be easily adjusted by including a heat ray absorbent in the first resin layer, the second resin layer, or both. In particular, in order to adjust the ratio C1 / C2 to 1.1 or more, the first resin layer does not contain a thermal absorbent or contains only a very small amount, while the second resin layer. It is preferable to contain a thermal absorbent.
In order to adjust the ratio C1 / C2 to 1.1 or more and improve the heat shielding property of the laminated glass, the content of the heat ray absorbent contained in the second resin layer is 100 parts by weight of the thermoplastic resin. On the other hand, it is preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, further preferably 0.5 parts by weight or more, and 0.8 parts by weight or more. Particularly preferred. Since the transparency of the resulting laminated glass is improved, the content of the heat ray absorbent contained in the second resin layer is preferably 5 parts by weight or less with respect to 100 parts by weight of the thermoplastic resin. It is more preferable that the amount is not more than parts by weight.

In order to adjust the ratio C1 / C2 to 1.1 or more, the content of the heat ray absorbent with respect to 100 parts by weight of the thermoplastic resin contained in the second resin layer is contained in the first resin layer. It is preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, and even more preferably 0.8 parts by weight or more, relative to 100 parts by weight of the thermoplastic resin.

The first resin layer and the second resin layer are, as necessary, a modified silicone oil, a flame retardant, an antistatic agent, a moisture-proofing agent as an ultraviolet shielding agent, an antioxidant, a light stabilizer, and an adhesive force adjusting agent. You may contain conventionally well-known additives, such as a heat ray reflective agent, a heat ray absorber, an antiblocking agent, and the coloring agent which consists of a pigment or dye.

The total thickness of the first resin layer and the second resin layer is 500 μm or more. By setting the total thickness of the first resin layer and the second resin layer to 500 μm or more, basic performance required for an interlayer film for laminated glass such as penetration resistance can be satisfied. The total thickness of the first resin layer and the second resin layer is preferably 600 μm or more, and more preferably 760 μm or more.
The total thickness of the first resin layer and the second resin layer is preferably 1500 μm or less, and more preferably 1200 μm or less.

Although the thickness of the said 1st resin layer is not specifically limited, A preferable minimum is 300 micrometers and a preferable upper limit is 1000 micrometers. When the thickness of the first resin layer is within this range, sufficient durability can be obtained, and basic qualities such as transparency and penetrability of the obtained laminated glass are satisfied. A more preferable lower limit of the thickness of the first resin layer is 380 μm, and a more preferable upper limit is 760 μm.

Although the thickness of the said 2nd resin layer is not specifically limited, A preferable minimum is 100 micrometers and a preferable upper limit is 500 micrometers. When the thickness of the second resin layer is within this range, the glass is warmed more quickly by placing it in an automobile or a building so that the second resin layer side is on the outside. The basic quality such as transparency and anti-penetration of the laminated glass obtained can be satisfied. A more preferable lower limit of the thickness of the second resin layer is 200 μm, and a more preferable upper limit is 380 μm.

In order to adjust the ratio C1 / C2 to 1.1 or more, the thickness of the first resin layer is preferably 100 μm or more thicker than the thickness of the second resin layer, more preferably 200 μm or more, More preferably, the thickness is 500 μm or more.

In FIG. 1, the schematic diagram which shows an example of the cross section of the thickness direction of the intermediate film for laminated glasses of this invention was shown.
In FIG. 1, an interlayer film 1 for laminated glass includes a heat generating layer 2 formed on a substrate 3, a first resin layer 4 laminated on one surface side of the heat generating layer 2, and the heat generating layer 2. It consists of the 2nd resin layer 5 laminated | stacked on the other surface side.
In addition, when the heat generating layer 2 is formed on the base material 3 as shown in FIG. 1, it is the base material 3 that is actually in contact with the second resin layer 5. It is assumed that both sides of the heat generating layer have a first resin layer and a second resin layer.

The interlayer film for laminated glass of the present invention may have a wedge-shaped cross section. If the cross-sectional shape of the interlayer film for laminated glass is wedge-shaped, by adjusting the wedge angle θ of the wedge-shaped according to the mounting angle of the laminated glass, the driver can simultaneously view the front field of view and instrument display without lowering the line of sight. Generation of a double image or a ghost image can be prevented when used in a head-up display that can be visually recognized. From the viewpoint of further suppressing double images, the preferable lower limit of the wedge angle θ is 0.1 mrad, the more preferable lower limit is 0.2 mrad, the still more preferable lower limit is 0.3 mrad, the preferable upper limit is 1 mrad, and the more preferable upper limit is 0.9 mrad.
For example, when an interlayer film for laminated glass having a wedge-shaped cross section is manufactured by a method of extruding a resin composition using an extruder, a slightly inner region (specifically, from one end on the thin side) , Where X is the distance between one end and the other end, and has a minimum thickness in the range from 0X to 0.2X inward from one end on the thin side, and one end on the thick side The maximum thickness in a slightly inner region (specifically, a region having a distance of 0X to 0.2X inward from one end on the thick side when the distance between one end and the other end is X) It may become the shape which has. In the present specification, such a shape is also included in the wedge shape. The distance X between the one end and the other end of the interlayer film for laminated glass is preferably 3 m or less, more preferably 2 m or less, particularly preferably 1.5 m or less, preferably 0.5 m or more, more preferably 0.8 m or more, particularly preferably 1 m or more.

When the cross-sectional shape of the interlayer film for laminated glass of the present invention is a wedge shape, for example, the thickness of the heat generating layer is set within a certain range, and the shape of the first resin layer and / or the second resin layer is adjusted. Thereby, it can adjust so that the cross-sectional shape as the whole intermediate film for laminated glasses may become a wedge shape which is a fixed wedge angle.

The method for producing the interlayer film for laminated glass of the present invention is not particularly limited, but a method in which a laminate in which the first resin layer, the heat generating layer, and the second resin layer are laminated in this order is thermocompression bonded is preferable. It is. Among them, each layer was unwound from a rolled body and laminated, and the obtained laminated body was thermocompression bonded through a heated press roll to obtain an interlayer film for laminated glass, and then obtained. A so-called roll-to-roll method in which the interlayer film for laminated glass is wound into a roll shape is suitable.

The laminated glass in which the interlayer film for laminated glass of the present invention is laminated between a pair of glass plates is also one aspect of the present invention.
The said glass plate can use the transparent plate glass generally used. Examples thereof include inorganic glass such as float plate glass, polished plate glass, template glass, netted glass, wire-containing plate glass, colored plate glass, heat ray absorbing glass, heat ray reflecting glass, and green glass. Further, an ultraviolet shielding glass having an ultraviolet shielding coating layer on the glass surface can also be used. Furthermore, organic plastics plates such as polyethylene terephthalate, polycarbonate, and polyacrylate can also be used.
Two or more types of glass plates may be used as the glass plate. For example, the laminated glass which laminated | stacked the intermediate film for laminated glasses of this invention between transparent float plate glass and colored glass plates like green glass is mentioned. Moreover, you may use the glass plate from which 2 or more types of thickness differs as said glass plate.
It does not specifically limit as a manufacturing method of the laminated glass of this invention, A conventionally well-known manufacturing method can be used.

The laminated glass system provided with the laminated glass of this invention and the voltage supply part for applying a voltage to the heat generating layer of the intermediate film for laminated glasses in this laminated glass is also one of this invention.

According to the present invention, heat is generated by applying a voltage to the heat generating layer, and in particular, the surface on the frozen side of the glass can be quickly warmed to melt frost and ice, and exhibits high penetration resistance. An interlayer film for laminated glass, a laminated glass using the interlayer film for laminated glass, and the laminated glass system can be provided.

It is a schematic diagram which shows an example of the cross section of the thickness direction of the intermediate film for laminated glasses of this invention.

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) Preparation of exothermic layer A 50 μm thick film made of polyethylene terephthalate (PET) was used as the base material. Sputtering was performed on the base material using silver as a target. Sputtering power was direct current (DC) 1000 W, the atmosphere gas was argon, the gas flow rate was 50 sccm, the sputtering pressure was 0.5 Pa, and a heat generating layer made of silver and having a thickness of 25 nm was formed.
The surface resistivity of the obtained heat generation layer was 3.3Ω / □.

(2) Preparation of first resin layer Polyvinyl butyral (hydroxyl content 30 mol%, acetylation degree 1 mol%, butyralization degree 69 mol%, average polymerization degree 1700) 100 parts by weight as a plasticizer 36 parts by weight of ethylene glycol di-2-ethylhexanoate (3GO) and 2- (2′-hydroxy-3′-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole (BASF) as an ultraviolet shielding agent "Tinuvin 326") 0.5 parts by weight and 2,6-di-t-butyl-p-cresol (BHT) 0.5 parts by weight as an antioxidant were added and kneaded thoroughly with a mixing roll. A composition was obtained. The obtained composition was extruded with an extruder to obtain a single-layer resin film made of polyvinyl butyral (PVB1) having a thickness of 300 μm.
The obtained resin film was cut into a size of 100 mm in length and 100 mm in width, and the weight was measured to find 3.1 g. Further, when the specific heat of the obtained resin film was measured by differential scanning calorimetry (DSC), it was 1.80 J / g · K. Therefore, the heat capacity of this resin film was calculated to be 5.6 J / K.

(3) Preparation of second resin layer Polyvinyl butyral (hydroxyl content 30 mol%, acetylation degree 1 mol%, butyralization degree 69 mol%, average degree of polymerization 1700) 100 parts by weight as a plasticizer 36 parts by weight of ethylene glycol di-2-ethylhexanoate (3GO) and 2- (2′-hydroxy-3′-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole (BASF) as an ultraviolet shielding agent "Tinuvin 326") 0.5 parts by weight and 2,6-di-t-butyl-p-cresol (BHT) 0.5 parts by weight as an antioxidant were added and kneaded thoroughly with a mixing roll. A composition was obtained. The obtained composition was extruded by an extruder to obtain a single-layer resin film having a thickness of 200 μm made of polyvinyl butyral (PVB1).
The obtained resin film was cut into a size of 100 mm in length and 100 mm in width, and the weight was measured to find 2.1 g. Further, when the specific heat of the obtained resin film was measured by differential scanning calorimetry (DSC), it was 1.80 J / g · K. Therefore, the heat capacity of this resin film was calculated to be 3.7 J / K.

(4) Production of interlayer film for laminated glass and laminated glass The first resin layer is formed by sandwiching a base material on which a heat generating layer is formed between the obtained first resin layer and the second resin layer and thermocompression bonding. An interlayer film for laminated glass having a laminated structure of / heat generation layer / base material / second resin layer was produced. Thermocompression bonding is performed using a thermocompression laminator (“MRK-650Y type” manufactured by MC Corporation) under the conditions of a heating temperature of 75 ° C., a pressure of 1.0 kN during crimping, and a tension of 20 N during conveyance. The roll method was used. For thermocompression bonding, a laminate roll in which the upper and lower rolls are both made of rubber was used.

The obtained interlayer film for laminated glass was cut into a size of 320 mm long × 300 mm wide and sandwiched between two transparent float glasses (length 300 mm × width 300 mm × thickness 2.5 mm) to obtain a laminate. At that time, the interlayer film for laminated glass protruded by 10 mm from the edge of the float glass. The first resin layer of the interlayer film for laminated glass protruding from the glass was cut out to expose the heat generating layer. A single-sided copper foil tape (STS-CU42S (manufactured by Sekisui Techno Corporation West Japan)) is attached as an electrode so that the exposed heat generation layer and the copper foil of the copper foil tape are in contact with each other, and a heat resistant tape (Niftron 973UL-S (Nitto Denko) ))) And temporarily fixed. The obtained laminated body was temporarily press-bonded using a 230 ° C. heating roll. Then, the laminated body temporarily crimped | bonded for 20 minutes on the conditions of 135 degreeC and the pressure of 1.2 MPa using the autoclave by the heating roll method, and the laminated glass was manufactured. Then, the heat-resistant tape was removed, and the copper foil tape was fixed by attaching a turn clip from above the single-sided copper foil tape.

(Examples 2 and 3, Comparative Examples 1 and 3)
An interlayer film for laminated glass and a laminated glass were produced in the same manner as in Example 1 except that the thicknesses of the first resin layer and the second resin layer were as shown in Table 1.

(Example 4)
(1) Preparation of exothermic layer A 50 μm thick film made of polyethylene terephthalate (PET) was used as the base material. Sputtering was performed on the base material using silver as a target. Sputtering power was direct current (DC) 1000 W, the atmosphere gas was argon, the gas flow rate was 50 sccm, the sputtering pressure was 0.5 Pa, and a heat generating layer made of silver and having a thickness of 25 nm was formed.
The surface resistivity of the obtained heat generation layer was 3.3Ω / □.

(2) Preparation of first resin layer Polyvinyl butyral (hydroxyl content 30 mol%, acetylation degree 1 mol%, butyralization degree 69 mol%, average polymerization degree 1700) 100 parts by weight as a plasticizer 36 parts by weight of ethylene glycol di-2-ethylhexanoate (3GO) and 2- (2′-hydroxy-3′-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole (BASF) as an ultraviolet shielding agent "Tinuvin 326") 0.5 parts by weight and 2,6-di-t-butyl-p-cresol (BHT) 0.5 parts by weight as an antioxidant were added and kneaded thoroughly with a mixing roll. A composition was obtained. The obtained composition was extruded by an extruder to obtain a single layer resin film having a thickness of 380 μm made of polyvinyl butyral (PVB1).
The obtained resin film was cut into a size of 100 mm in length and 100 mm in width and the weight was measured to find 4.0 g. Further, when the specific heat of the obtained resin film was measured by differential scanning calorimetry (DSC), it was 1.80 J / g · K. Therefore, the heat capacity of this resin film was calculated as 7.1 J / K.

(3) Preparation of second resin layer Polyvinyl butyral (hydroxyl content 30 mol%, acetylation degree 1 mol%, butyralization degree 69 mol%, average degree of polymerization 1700) 100 parts by weight as a plasticizer 36 parts by weight of ethylene glycol di-2-ethylhexanoate (3GO), 0.8 parts by weight of tin-doped indium oxide (ITO) particles, and 2- (2′-hydroxy-3′-t-butyl) as an ultraviolet shielding agent -5-methylphenyl) -5-chlorobenzotriazole ("Tinuvin 326" manufactured by BASF) 0.5 part by weight and 2,6-di-t-butyl-p-cresol (BHT) 0.5 as an antioxidant Part by weight was added and sufficiently kneaded with a mixing roll to obtain a composition. The obtained composition was extruded with an extruder to obtain a single-layer resin film having a thickness of 380 μm made of polyvinyl butyral (SCH) containing ITO.
The obtained resin film was cut into a size of 100 mm in length and 100 mm in width and the weight was measured to find 4.0 g. Further, when the specific heat of the obtained resin film was measured by differential scanning calorimetry (DSC), it was 1.59 J / g · K. Therefore, the heat capacity of this resin film was calculated to be 6.3 J / K.

(4) Production of interlayer film for laminated glass and laminated glass The first resin layer is formed by sandwiching a base material on which a heat generating layer is formed between the obtained first resin layer and the second resin layer and thermocompression bonding. An interlayer film for laminated glass having a laminated structure of / heat generation layer / base material / second resin layer was produced. Thermocompression bonding is performed using a thermocompression laminator (“MRK-650Y type” manufactured by MC Corporation) under the conditions of a heating temperature of 75 ° C., a pressure of 1.0 kN during crimping, and a tension of 20 N during conveyance. The roll method was used. For thermocompression bonding, a laminate roll in which the upper and lower rolls are both made of rubber was used.

The obtained interlayer film for laminated glass was cut into a size of 320 mm long × 300 mm wide and sandwiched between two transparent float glasses (length 300 mm × width 300 mm × thickness 2.5 mm) to obtain a laminate. At that time, the interlayer film for laminated glass protruded by 10 mm from the edge of the float glass. The first resin layer of the interlayer film for laminated glass protruding from the glass was cut out to expose the heat generating layer. A single-sided copper foil tape (STS-CU42S (manufactured by Sekisui Techno Corporation West Japan)) is attached as an electrode so that the exposed heat generation layer and the copper foil of the copper foil tape are in contact with each other, and a heat resistant tape (Niftron 973UL-S (Nitto Denko) ))) And temporarily fixed. The obtained laminated body was temporarily press-bonded using a 230 ° C. heating roll. Then, the laminated body temporarily crimped | bonded for 20 minutes on the conditions of 135 degreeC and the pressure of 1.2 MPa using the autoclave by the heating roll method, and the laminated glass was manufactured. Then, the heat-resistant tape was removed, and the copper foil tape was fixed by attaching a turn clip from above the single-sided copper foil tape.

(Comparative Example 2)
Example 4 except that 0.15 parts by weight of tin-doped indium oxide (ITO) particles was used to prepare a second resin layer having a thickness of 380 μm made of polyvinyl butyral (SCL) containing ITO. In the same manner, an interlayer film for laminated glass and a laminated glass were produced.

(Example 5)
(1) Preparation of exothermic layer A 50 μm thick film made of polyethylene terephthalate (PET) was used as the base material. Sputtering was performed on the base material using silver as a target. Sputtering power was direct current (DC) 1000 W, the atmosphere gas was argon, the gas flow rate was 50 sccm, the sputtering pressure was 0.5 Pa, and a heat generating layer made of silver and having a thickness of 25 nm was formed.
The surface resistivity of the obtained heat generation layer was 3.3Ω / □.

(2) Preparation of first resin layer Polyvinyl butyral (hydroxyl content 30 mol%, acetylation degree 1 mol%, butyralization degree 69 mol%, average polymerization degree 1700) 100 parts by weight as a plasticizer 36 parts by weight of ethylene glycol di-2-ethylhexanoate (3GO) and 2- (2′-hydroxy-3′-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole (BASF) as an ultraviolet shielding agent "Tinuvin 326") 0.5 parts by weight and 2,6-di-t-butyl-p-cresol (BHT) 0.5 parts by weight as an antioxidant were added and kneaded thoroughly with a mixing roll. A composition was obtained. The obtained composition was extruded by an extruder to obtain a single layer resin film having a thickness of 380 μm made of polyvinyl butyral (PVB1).
The obtained resin film was cut into a size of 100 mm in length and 100 mm in width and the weight was measured to find 4.0 g. Further, when the specific heat of the obtained resin film was measured by differential scanning calorimetry (DSC), it was 1.80 J / g · K. Therefore, the heat capacity of this resin film was calculated as 7.1 J / K.

(3) Preparation of second resin layer Polyvinyl butyral (hydroxyl content 30 mol%, acetylation degree 1 mol%, butyralization degree 69 mol%, average degree of polymerization 1700) 100 parts by weight as a plasticizer 36 parts by weight of ethylene glycol di-2-ethylhexanoate (3GO), 0.05 parts by weight of carbon black, and 2- (2′-hydroxy-3′-t-butyl-5-methylphenyl) as an ultraviolet shielding agent ) -5-chlorobenzotriazole ("Tinuvin 326" manufactured by BASF) 0.5 part by weight and 2,6-di-t-butyl-p-cresol (BHT) 0.5 part by weight as an antioxidant were added. The mixture was sufficiently kneaded with a mixing roll to obtain a composition. The obtained composition was extruded using an extruder to obtain a single-layer resin film having a thickness of 380 μm made of polyvinyl butyral (DG7018) containing carbon black.
The obtained resin film was cut into a size of 100 mm in length and 100 mm in width and the weight was measured to find 4.0 g. Further, when the specific heat of the obtained resin film was measured by differential scanning calorimetry (DSC), it was 1.63 J / g · K. Therefore, the heat capacity of this resin film was calculated to be 6.4 J / K.

(4) Production of interlayer film for laminated glass and laminated glass The first resin layer is formed by sandwiching a base material on which a heat generating layer is formed between the obtained first resin layer and the second resin layer and thermocompression bonding. An interlayer film for laminated glass having a laminated structure of / heat generation layer / base material / second resin layer was produced. Thermocompression bonding is performed using a thermocompression laminator (“MRK-650Y type” manufactured by MC Corporation) under the conditions of a heating temperature of 75 ° C., a pressure of 1.0 kN during crimping, and a tension of 20 N during conveyance. The roll method was used. For thermocompression bonding, a laminate roll in which the upper and lower rolls are both made of rubber was used.

The obtained interlayer film for laminated glass was cut into a size of 320 mm long × 300 mm wide and sandwiched between two transparent float glasses (length 300 mm × width 300 mm × thickness 2.5 mm) to obtain a laminate. At that time, the interlayer film for laminated glass protruded by 10 mm from the edge of the float glass. The first resin layer of the interlayer film for laminated glass protruding from the glass was cut out to expose the heat generating layer. A single-sided copper foil tape (STS-CU42S (manufactured by Sekisui Techno Corporation West Japan)) is attached as an electrode so that the exposed heat generation layer and the copper foil of the copper foil tape are in contact with each other, and a heat resistant tape (Niftron 973UL-S (Nitto Denko) ))) And temporarily fixed. The obtained laminated body was temporarily press-bonded using a 230 ° C. heating roll. Then, the laminated body temporarily crimped | bonded for 20 minutes on the conditions of 135 degreeC and the pressure of 1.2 MPa using the autoclave by the heating roll method, and the laminated glass was manufactured. Then, the heat-resistant tape was removed, and the copper foil tape was fixed by attaching a turn clip from above the single-sided copper foil tape.

(Evaluation)
About the laminated glass obtained by the Example and the comparative example, it evaluated by the following method.
The results are shown in Table 1.

(1) Evaluation of exothermic deflection The low temperature constant temperature machine (manufactured by Espec, “PU-2J”) is kept at −18 ° C. ± 2 ° C., and the laminated glass with the alligator cable attached to the electrode is placed in the low temperature constant temperature chamber. A thermocouple was attached to the center of the glass surface on the side of the first resin layer and the glass surface on the side of the second resin layer with an adhesive tape, and the state was adjusted for 12 hours. The glass surface temperature was recorded using a data logger (manufactured by Keyence Corporation, “NR-1000”).
The time t1 required for connecting the alligator cable and the DC power supply PWR800L (manufactured by KIKUSUI), applying a voltage of 14 V, and the glass surface on the first resin layer side reaching 0 ° C., and the second resin layer The time t2 required for the side glass surface to reach 0 ° C. was measured, and the exothermic deflection was evaluated according to the following criteria based on the absolute value of the difference between t1 and t2.
○: The absolute value of the difference between t1 and t2 is 90 seconds or more. Δ: The absolute value of the difference between t1 and t2 is 30 seconds or more and less than 90 seconds. X: The absolute value of the difference between t1 and t2 is less than 30 seconds.

(2) Evaluation of penetration resistance 6 sheets of the obtained laminated glass were prepared, and the condition was adjusted for 4 hours in a low temperature thermostat set to 23 ° C. ± 2 ° C. (“PU-2J” manufactured by Espec). After fixing to the support frame described in JIS R 3212, a steel ball having a smooth surface of 2260 g ± 20 g and a diameter of 82 mm was dropped onto the center portion of the laminated glass from the height of 3.0 m. For all six laminated glasses, the case where the hard sphere did not penetrate within 5 seconds after the collision of the hard sphere was regarded as acceptable. If the number of laminated glasses in which the hard sphere did not penetrate within 5 seconds after the collision of the hard sphere was 3 or less, it was rejected. In the case of four sheets, the penetration resistance of six new laminated glasses was evaluated. In the case of 5 sheets, one additional laminated glass was additionally tested, and the case where the hard sphere did not penetrate within 5 seconds after the collision of the hard sphere was regarded as acceptable. In the same manner, six laminated glasses from a height of 3.5 m, 4.0 m, 4.5 m, 5.0 m, 5.5 m, 6.0 m, 6.5 m, 7.0 m and 7.5 m For each, a hard sphere was dropped and the maximum value of the acceptable height was measured. The maximum value of the obtained acceptable height was determined as the average breaking height (MBH), and the penetration resistance was evaluated according to the following criteria.
○: MBH is 5 m or more Δ: MBH is 4 m or more and less than 5 m ×: MBH is less than 4 m

According to the present invention, heat is generated by applying a voltage to the heat generating layer, and in particular, the surface on the frozen side of the glass can be quickly warmed to melt frost and ice, and exhibits high penetration resistance. An interlayer film for laminated glass, a laminated glass using the interlayer film for laminated glass, and the laminated glass system can be provided.

DESCRIPTION OF SYMBOLS 1 Intermediate film for laminated glass 2 Heat generation layer 3 Base material 4 First resin layer 5 Second resin layer

Claims (8)

An interlayer film for laminated glass having a heat generating layer, and a first resin layer and a second resin layer laminated on both surfaces of the heat generating layer,
The ratio C1 / C2 between the heat capacity C1 of the first resin layer and the heat capacity C2 of the second resin layer is 1.1 or more, and the thickness between the first resin layer and the second resin layer The interlayer film for laminated glass is characterized by having a total of 500 μm or more. The interlayer film for laminated glass according to claim 1, wherein the surface resistivity of the heat generating layer is 10Ω / □ or less. The interlayer film for laminated glass according to claim 1 or 2, wherein the first resin layer and the second resin layer contain a thermoplastic resin. The interlayer film for laminated glass according to claim 3, wherein the thermoplastic resin is polyvinyl acetal. The interlayer film for laminated glass according to claim 1, 2, 3, or 4, wherein the first resin layer and the second resin layer contain a plasticizer. The first resin layer and the second resin layer contain at least one adhesive strength adjusting agent selected from the group consisting of alkali metal salts, alkaline earth metal salts, and magnesium salts. The interlayer film for laminated glass according to 1, 2, 3, 4 or 5. A laminated glass, wherein the interlayer film for laminated glass according to claim 1, 2, 3, 4, 5, or 6 is laminated between a pair of glass plates. A laminated glass system comprising: the laminated glass according to claim 7; and a voltage supply unit for applying a voltage to the heat generating layer of the interlayer film for laminated glass in the laminated glass.

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