JPH08337445A - Intermediate film for sandwich glass and sandwich glass - Google Patents

Abstract

PURPOSE: To obtain sandwich glass having excellent penetration resistance and glass splashing preventiveness without degradation in adhesive power with lapse of time by forming a film having specific constitution as an intermediate film of a transparent plate formed with a metal oxide layer or metallic layer on its inside surface side and a glass plate. CONSTITUTION: This sandwich glass 30 is constituted by inserting the intermediate film 20 for the sandwich glass between the transparent plate 10+11 formed with the metal oxide layer or metallic layer 11 on at least its inside surface side and the glass plate 10. The intermediate film 20 is composed of a base layer 22 formed of a polyvinyl acetal resin contg. a plasticizer and having an acetalization rate of 60 to 75mol% as an essential component and an adhesive power adjusting layer 21 formed of a polyvinyl acetal resin contg. a plasticizer, having a molar fraction of 8 to 30mol% of the ethylene group bonded with an acetoxy group to the total ethylene group of the main chain and an acetalization rate of 60 to 75mol% as an essential component. The metal oxide layer or the metallic layer 11 side is provided with the adhesive power adjusting layer 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlayer film for laminated glass and a laminated glass used for a laminated glass which is particularly excellent in penetration resistance and glass scattering prevention and has a high function of heat ray reflection.

[0002]

2. Description of the Related Art Conventionally, laminated glass has been widely used for construction and windshields of automobiles. A typical example of this laminated glass is one in which an interlayer film made of a plasticized polyvinyl acetal resin composition is interposed between a pair of glass plates and laminated. In such a laminated glass, the glass portion is damaged when an impact is applied from the outside, but the interlayer film interposed between the glasses is not easily damaged, and the damaged glass is in a state of being attached to the interlayer film. Therefore, the glass fragments are less likely to be scattered. Therefore, it is possible to prevent a person in a transportation system or a building from being injured by the broken glass.

In order to satisfy such a function as a safety glass, it is necessary to adjust the adhesive force between the interlayer film and the glass within a certain range. That is, in the laminated glass having a too small adhesive force between the glass plate and the interlayer film, the glass is peeled from the film and scattered by an external impact, and on the contrary, in the laminated glass where the adhesive force between the glass plate and the interlayer film is too large, This is because the glass and the film both break and penetrate due to the impact from the outside.

In order to adjust the adhesive force between the glass plate and the intermediate film, an adhesive force adjusting agent (sometimes referred to as an impact strength increasing agent) is usually kneaded and contained in the intermediate film or is attached to the surface. The method of letting is adopted. of course,
The water content in the interlayer is also adjusted.

Alkali metal salts or alkaline earth metal salts of carboxylic acids, modified silicone oils and the like are generally used as the adhesion control agent (for example, Japanese Examined Patent Publication No.
32071 and Japanese Patent Publication No. 55-29950).

By the way, in recent years, there has been proposed a laminated glass in which a layer having a high function is provided on the inner surface side of a glass plate to impart a high function such as selective light transmittance and transparent conductivity. For example, heat-reflecting glass, dew condensation-preventing conductive glass, and the like, and these special laminated glasses have begun to be used in buildings and automobiles. These characteristics are mainly obtained by forming a highly functional thin film on the glass surface by a vacuum deposition method, a sputtering method, or the like.

As for the structure of the layer having a high function, for example, the heat ray reflective glass for construction often has a metal oxide layer (heat ray reflective layer) provided on the inner surface of the glass. In many heat ray reflective glasses for automobiles, a layer (heat ray reflection layer) in which a metal layer such as silver is sandwiched between metal oxide layers is provided on the inner surface of a glass plate.

Laminated glass using these metal oxide layers or metal layers (heat ray reflection layer) is mainly composed of glass plate / heat ray reflection sheet / intermediate film / glass sheet, glass plate / intermediate film / heat ray reflection sheet / intermediate. It is a membrane / glass plate structure, and the high-performance layer provided on the glass plate or sheet is arranged inside the laminated glass to protect it.
Therefore, the metal oxide layer or the metal layer comes into contact with the intermediate film.

[0009]

Even in a laminated glass having such a metal oxide layer or a metal layer, a high degree of penetration resistance and glass scattering prevention property are required, and in order to impart these properties. Therefore, it is necessary to highly adjust the adhesive force between the metal oxide layer or the metal layer and the intermediate film.

However, unlike the ordinary laminated glass having no metal oxide layer or metal layer, the one obtained by kneading the adhesiveness adjusting agent consisting of a carboxylic acid metal salt into the interlayer film or adhering it to the surface is different from outdoor exposure or There is a problem that the adhesive force between the two is easily reduced with the irradiation of ultraviolet rays over time, and the glass plate is easily peeled from the interlayer film due to impact.

In the case where the adhesive film made of modified silicone oil is kneaded into the interlayer film, the change with time due to outdoor exposure or ultraviolet irradiation is small, but the change with time in the adhesive force becomes large, and the change due to impact or the like occurs. There is a problem that the glass plate is more easily peeled off than the intermediate film.

Since the modified silicone oil is a liquid and is not completely compatible with the resin and the plasticizer, the adhesive force is gradually bleeded out at the interface between the metal oxide layer or the metal layer and the intermediate film. It is thought to be for the sake of saving.

It should be noted that the one in which an adhesiveness modifier made of modified silicone oil is adhered to the surface of the intermediate film has the intermediate film and the glass on the heat ray reflecting surface side (metal oxide layer or metal layer) and the glass plate side. There is a problem that the adhesive strength with the plate is significantly different and the penetration resistance is deteriorated.

As a result of intensive studies to solve the above problems, the inventors of the present invention have found that an interlayer film for laminated glass having a specific structure has a metal oxide layer or a metal layer on at least the inner surface side of a heat ray reflective glass or the like. By using it for a transparent plate formed with, it was found that there is almost no decrease in adhesive strength over time due to outdoor exposure, ultraviolet irradiation, and temperature, and that it has excellent penetration resistance and glass scattering prevention properties, and completed the present invention. Came to do.

The object of the present invention is to provide a glass having high functionality such as heat ray reflectivity and the like, which has almost no decrease in adhesive strength over time due to outdoor exposure, ultraviolet irradiation and temperature, is excellent in penetration resistance and glass scattering prevention property. To provide an interlayer film for laminated glass and laminated glass used in.

[0016]

That is, the present invention provides an interlayer film for laminated glass, which is sandwiched between a transparent plate having a metal oxide layer or a metal layer formed on at least the inner surface side and a glass plate. The degree of acetalization is 60-75 mol%
And a base layer formed of a resin composition containing a polyvinyl acetal resin as a main component in the range of, and a mole fraction of the main chain of ethylene groups to which acetoxy groups are bonded to all ethylene groups is 8 to 30 mol% and Acetalization degree is 60-7
And an adhesive strength adjusting layer formed of a resin composition containing a polyvinyl acetal resin as a main component in an amount of 5 mol%, wherein the adhesive strength adjusting layer has the metal oxide layer or the metal layer. An intermediate film for laminated glass, which is characterized in that it is provided on the side surface.

Further, according to the present invention, the interlayer film for laminated glass described above is sandwiched between a glass plate and a transparent plate having a metal oxide layer or a metal layer formed on the inner surface side thereof, and an acetoxy group. A resin composition containing a polyvinyl acetal resin as a main component, in which the molar fraction of the main chain of the ethylene groups bonded to is 8 to 30 mol% and the degree of acetalization is in the range of 60 to 75 mol%. The laminated glass is characterized in that the adhesive strength adjusting layer formed by the above is adhered so as to be in contact with the metal oxide layer or the metal layer side.

The structure of the present invention will be described in detail below. The base layer of the interlayer film for laminated glass used in the present invention is formed of a plasticized polyvinyl acetal resin obtained by adding a plasticizer to a polyvinyl acetal resin having an acetalization degree of 60 to 75 mol%. Furthermore, the object of the present invention can be achieved even when a modified silicone oil is contained.

As the polyvinyl acetal resin, a resin of the type conventionally used for an interlayer film of laminated glass, for example, a resin obtained by acetalizing polyvinyl alcohol with an aldehyde having 4 to 10 carbon atoms is used.

When the degree of acetalization of the polyvinyl acetal resin is lower than 60 mol%, the compatibility with the plasticizer is poor, and when the degree of acetalization of the resin is higher than 75 mol%, it is used as a laminated glass. Various performances, such as penetration resistance, are reduced.

The polyvinyl alcohol used for producing the polyvinyl acetal resin preferably has an average degree of polymerization of 800 to 3000. Average degree of polymerization is 8
When it is less than 00, the laminated glass has poor penetration resistance, and when the average degree of polymerization is more than 3000, the strength is too high and it is not usually used as a safety glass.

The degree of saponification of polyvinyl alcohol is such that transparency, heat resistance and light resistance are good.
It is preferably 95 mol% or more.

As the plasticizer to be added to the polyvinyl acetal, organic plasticizers such as monobasic acid esters and polybasic acid esters, and phosphoric acid plasticizers such as organic phosphoric acid compounds and organic phosphorous acid compounds are used. To be

Among the monobasic acid esters, triethylene glycol, butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptanoic acid, n-octylic acid, 2-ethylhexylic acid, pelasgonic acid (n-nonyl acid), A glycol ester obtained by reaction with an organic acid such as decyl acid is desirable. In addition, esters of tetraethylene glycol and tripropylene glycol with the above organic acids are also used.

As the polybasic acid ester, adipic acid,
An ester of an organic acid such as sebacic acid or azelaic acid and a linear or branched alcohol having 4 to 8 carbon atoms is preferable.

As the phosphoric acid type plasticizer, tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphite and the like are preferable.

More preferred examples of the monobasic acid ester include triethylene glycol-di-2-ethylbutyrate, triethylene glycol-di-2-ethylhexoate, triethylene glycol-dicapronate and triethylene glycol-di-n-octate. Etc.

Such a plasticizer is preferably resin 100
5 to 80 parts by weight are mixed with respect to parts by weight. If the plasticizer content is less than 5 parts by weight, the penetration resistance decreases, and conversely 8
If it exceeds 0 parts by weight, the plasticizer bleeds out and the transparency of the laminated glass and the adhesiveness with a glass plate or the like are lost.

The base layer may contain known additives such as an ultraviolet absorber, a light stabilizer and an antioxidant.

The base layer of the interlayer film for laminated glass comprises a polyvinyl acetal resin mixed with a required amount of a plasticizer and, if necessary, other additives, which are kneaded and melted by, for example, an extruder to form a sheet. It can be obtained by molding. It can also be obtained by pressing after kneading and melting with a roll.

The thickness of the base layer of the interlayer film for laminated glass is not particularly limited, but in order to maintain the penetration resistance, which is a characteristic required for safety laminated glass,
0.1-2 mm is preferable.

The adhesive force adjusting layer used between the base layer and the metal oxide layer or the metal layer of the transparent plate has a mole fraction of ethylene groups having an acetoxy group bonded to all ethylene groups of the main chain. It is formed of a plasticized polyvinyl acetal resin composition containing a plasticizer in a polyvinyl acetal resin having a degree of acetalization of 8 to 30 mol% and a degree of acetalization of 60 to 75 mol%.

Such a polyvinyl acetal resin is
It is obtained by acetalizing polyvinyl alcohol with an aldehyde having 4 to 10 carbon atoms, and usually has an acetal group, an acetyl group and a hydroxyl group in the ethylene group of the main chain. The average degree of polymerization of polyvinyl alcohol, which is a raw material for producing the polyvinyl acetal resin, is preferably 800 to 3000. When the average degree of polymerization is less than 800, the film formed from the obtained resin has poor mechanical strength, and the laminated glass using the same naturally has low penetration resistance, and when the average degree of polymerization exceeds 3000, Is too strong to be usually used for laminated glass.

In the above polyvinyl acetal resin,
The amount of the ethylene group to which the acetoxy group is bonded is 8 to 30.
Limited to mol%. When this amount is 8 mol% or less,
Elongation when an impact load is applied cannot be obtained sufficiently, impact resistance cannot be ensured, and conversely, when it is 30 mol% or more, transparency and reaction rate of aldehyde are remarkably lowered, which is not preferable.

The degree of acetalization of the polyvinyl acetal resin is limited to 60 to 75 mol%. When it is less than 60 mol%, the obtained film becomes too hard to show a good elongation, and the compatibility with the plasticizer is not good and the transparency is impaired. On the other hand, if it is more than 75 mol%, the film will be too soft and the mechanical strength will be lowered.

The type of plasticizer and the amount of the plasticizer compounded in the polyvinyl acetal resin are the same as those used in the base layer and the range. The thickness of the resin composition is not particularly limited, but is usually 0.1 to 2 mm.

Further, the adhesive force adjusting layer made of the above resin composition may contain an ultraviolet absorber or an antioxidant, and those conventionally used are used.

To produce a laminated glass using the thus obtained interlayer film for laminated glass, a metal oxide is provided between the glass plate and the transparent plate having the metal oxide layer or the metal layer formed on the inner surface side. Polyvinyl chloride in which the acetoxy group-bonded ethylene group on the layer or metal layer side is in the range of 8 to 30 mol% and the degree of acetalization is in the range of 60 to 75 mol% based on the total ethylene groups in the main chain. It is sandwiched so that layers formed of a resin composition containing an acetal resin as a main component are in contact with each other.

As the glass plate, an inorganic or organic transparent glass plate is generally used. The transparent plate is not particularly limited as long as it is transparent, and a transparent glass plate is usually used.

The metal oxide layer or the metal layer is for imparting high functions such as transparent conductivity and heat ray reflectivity, and for imparting transparent conductivity, for example, a mixture of indium oxide and tin oxide ( A coating film of ITO, tin oxide, zinc oxide, gold, silver, copper or the like is formed. For imparting heat ray reflectivity, for example, a metal coating of gold, silver, copper, tin, aluminum, nickel, palladium and alloys or mixtures thereof is formed.

These metal oxide layers or metal layers may be formed directly on the inner surface of the transparent plate, or once the metal oxide layer or metal layer is formed on a suitable sheet,
This functional sheet may be adhered to the inner surface of the transparent plate via an appropriate adhesive layer (intermediate film). The metal oxide layer or the metal layer may be formed not only on the inner surface side of the transparent plate but also on both the inner surface side and the outer surface side of the glass plate.

Next, this laminated body is heated and pressed using a device such as an autoclave. Thus, the laminated glass of the present invention is manufactured. In this case, the adhesive force between the transparent plate on which the metal oxide layer or the metal layer is formed and the intermediate film and the adhesive force between the glass plate on which the metal oxide layer or the metal layer is not formed and the intermediate film are almost equal to each other. It is preferable that they are equivalent from the viewpoint of penetration resistance.

The adhesive force between the transparent plate on which the metal oxide layer or the metal layer is formed and the intermediate film is changed by changing the degree of acetalization, and the glass plate on which the metal oxide layer or the metal layer is not formed. The adhesive strength to the intermediate film can be adjusted by adjusting the addition amount of each additive (carboxylic acid metal oxide, dicarboxylic acid compound and modified silicone oil).

FIG. 1 is an exploded sectional view showing a typical example of the interlayer film for laminated glass and the laminated glass of the present invention. In FIG. 1, 10 is a glass plate, 11 is a metal oxide layer or a metal layer, 21 is an ethylene group to which an acetoxy group is bonded, and the mole fraction of all ethylene groups in the main chain is 8 to 30 mol%. And the degree of acetalization is 60 to 7
An adhesive force adjusting layer formed from a resin composition containing 5 mol% of a polyvinyl acetal resin as a main component, and 22 a resin composition containing a polyvinyl acetal resin as a main component having an acetalization degree of 60 to 75 mol%. Is a base layer formed by the above method, 20 is an interlayer film for laminated glass, and 30 is laminated glass.

[0045]

According to the present invention, the metal oxide layer or the metal layer imparts high functionality (heat-ray reflectivity, etc.), and the mole fraction of the main chain of the ethylene group to which the acetoxy group is bonded to all ethylene groups. Of an adhesiveness adjusting layer formed of a resin composition containing a polyvinyl acetal resin having an acetalization degree of 60 to 75 mol% as a main component of 8 to 30 mol% on the metal oxide layer or the metal layer side. By, the adhesive force between the intermediate film and the metal oxide layer or the metal layer is appropriately adjusted,
Further, by arranging a base layer formed of a resin composition composed of a polyvinyl acetal resin having an acetalization degree in the range of 60 to 75 mol% on the glass side on which a metal oxide or a metal layer is not formed, a glass surface is formed. The adhesive force with the intermediate film is adjusted appropriately.

[0046]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

Example 1 Preparation of Adhesion Strength Adjustment Layer of Intermediate Film for Laminated Glass (Preparation of Polyvinyl Acetal Film with Acetoxy Group 11.9 mol%) Deionized water 2890 g had a degree of polymerization of 1700 and a degree of saponification of 88.1%.
Polyvinyl alcohol (191 g) was added and dissolved by heating.
Temperature of the reaction system was adjusted to 12 ° C, and 201 g of 35 wt% hydrochloric acid
And 130 g of butyraldehyde were added to deposit a polyvinyl butyral resin. Then, the reaction system was kept at a temperature of 50 ° C. for 5 hours to complete the reaction. Unreacted aldehyde was washed away by washing with excess water, the hydrochloric acid catalyst was neutralized, salts were removed, and drying was performed to obtain a white powder of polyvinyl butyral resin. The polyvinyl butyral resin has a degree of acetalization of 60.2 mol% and an acetoxy group content of 11.9.
It was mol%.

50 g of the above polyvinyl butyral resin,
14 g of triethylene glycol-di-2-ethylbutyrate as a plasticizer, 0.10 g of an ultraviolet absorber and 0.10 g of an antioxidant are mixed. This mixture was well kneaded with a two-roll heated to 80 ° C to form a thickness of about 0.2 mm, and this was heated and pressed at 150 ° C with a press regulated by a spacer to form a film with a thickness of 0.16 mm ( An adhesive force adjusting layer) was obtained. After that, the water content of this in a constant temperature and humidity chamber is 0.4 to 0.
It was adjusted to be 5% by weight.

Preparation of Base Layer of Intermediate Film for Laminated Glass 50 g of polyvinyl butyral resin having a polymerization degree of 1700, a saponification degree of 99.2% and an acetalization degree of 65 mol%, and 20 g of triethylene glycol-di-2-ethylbutyrate as a plasticizer. , Magnesium acetate (0.015 g), an ultraviolet absorber (0.10 g) and an antioxidant (0.10 g) were mixed and mixed using a raikai machine. This mixture was well kneaded with a two-roll heated to 80 ° C to form a thickness of about 0.7 mm, and this was heated and pressed at 150 ° C with a press regulated by a spacer to obtain a laminated glass with a thickness of 0.60 mm. A base layer of an intermediate film for use was obtained.

Preparation of Laminated Glass The base layer of the interlayer film for laminated glass and the polyvinyl butyral film (adhesive strength adjusting layer) having an acetoxy group of 11.9 mol% thus obtained were cut into 305 mm × 305 mm,
Conductive glass (thickness: 2.5 mm) and float glass (thickness: 2.5 mm) having the same size glass / ITO structure
In such a manner that the ITO layer of the conductive glass is on the inner side, a glass / ITO / polyvinyl acetal film having 11.9 mol% of acetoxy group (adhesive strength adjustment layer) / interlayer film base layer for laminated glass / glass It was sandwiched by the constitution and pre-bonded with a roll. Then, in an autoclave at 130 ℃ 13
A laminated glass was manufactured by pressure bonding at a pressure of kg / cm ² . The laminated glass was subjected to a Pammel test before and after UV irradiation by the following method. The results are shown in Table 2.

<Light resistance test> According to the light resistance test of JIS R3212, from a 750 W quartz glass mercury lamp to 230
Laminated glass is placed at a distance of mm and irradiated at 45 ° C. for 200 hours. The Panmel value of the laminated glass before and after irradiation is evaluated.

<Pummel Test> The laminated glass before and after irradiation was adjusted to a temperature of −18 ° C. ± 0.6 ° C. for 16 hours, and the central portion (150 mm × 150 m) of this laminated glass was adjusted.
(portion m) is hit with a hammer having a head of 0.45 Kg, and crushed until the particle diameter of glass is 6 mm or less,
The degree of exposure of the film after the glass was partially peeled off was judged by the Pammel value according to Table 1.

[0053]

[Table 1]

In the present invention, a laminated glass having a Pammel value in the range of 3 to 8 and having a small difference on both sides is preferable because it is excellent in penetration resistance and glass scattering prevention property. If the Pammel value is less than 3, the adhesive strength will be low, and the anti-scattering property due to impact will be reduced. On the other hand, when the Pammel value exceeds 8, the adhesive strength becomes high and the penetration resistance of the laminated glass due to impact or the like decreases.

[Example 2] In Example 1, the amount of butyraldehyde charged was changed, and other steps were the same as in Example 1, and polyvinyl acetate having an acetoxy group of 11.9 mol% and an acetalization degree of 70.0 mol%. Butyral resin was obtained. 50 g of this polyvinyl butyral resin was mixed with 12 g of triethylene glycol-2-diethyl butyrate as a plasticizer.
g, an ultraviolet absorber 0.10 g, and an antioxidant 0.10 g are mixed to obtain an adhesive strength adjusting layer of a 0.16 mm interlayer film for laminated glass in the same manner as in Example 1, and the water content is 0.4 to. 0.5%
Was prepared. Further, the base layer of the interlayer film for laminated glass was prepared in the same manner as in Example 1 except that the kneading amount of magnesium acetate in Example 1 was changed to 0.018 g.

The polyvinyl acetal film having an acetoxy group of 11.9 mol% thus obtained and the intermediate film base layer were mixed with each other.
Glass / Zn with the same dimensions cut into 5 mm x 305 mm
Conductive glass with a structure of O / Ag / ZnO (thickness 2.
5 mm) and the float glass (thickness 2.5 mm) so that the ZnO layer of the conductive glass is on the inside.
A laminated glass was manufactured in the same manner as in Example 1. With respect to this laminated glass, a Pammel test was conducted before and after irradiation with ultraviolet rays. The results are shown in Table 2.

[Example 3] A polyvinyl acetal resin having a saponification degree of 82.1 mol% was used when the polyvinyl acetal resin was prepared, and the amount of aldehyde charged was changed. A polyvinyl butyral resin having a yield of 17.9 mol% and an acetalization degree of 61.5 mol% was obtained. This polyvinyl butyral resin 50
g was mixed with 13 g of triethylene glycol-2-diethyl butyrate as a plasticizer, 0.10 g of an ultraviolet absorber and 0.10 g of an antioxidant, and 0.16 g was prepared in the same manner as in Example 1.
The adhesive force adjusting layer of the interlayer film for laminated glass having a thickness of mm was obtained, and the water content was adjusted to be 0.4 to 0.5%. Further, the base layer of the interlayer film for laminated glass was prepared in the same manner as in Example 1 except that 0.021 g of magnesium acetate was kneaded in Example 1.

The acetoxy group thus obtained was 17.9.
3% mol% polyvinyl acetal film and intermediate film base layer
Cut to 05mm x 305mm and have the same size of glass / I
The ITO layer of the conductive glass is placed inside between the conductive glass having a TO structure (thickness 2.5 mm) and the float glass (thickness 2.5 mm), and the same procedure as in Example 1 is performed. The glass was manufactured. With respect to this laminated glass, a Pammel test was conducted before and after irradiation with ultraviolet rays. The results are shown in Table 2.

Comparative Example 1 As a polyvinyl acetal resin, 50 g of polyvinyl butyral resin having a degree of polymerization of 1700, an acetalization degree of 65 mol% and a saponification degree of 99% was added to 20 g of triethylene glycol-di-2-ethylbutyrate as a plasticizer. Ultraviolet absorber 0.10g, antioxidant 0.10g, polyether modified silicone oil represented by the following chemical formula "Chemical formula 1" (m = 10-20, n = 10-2
0, X = 2-8) 0.015 g and magnesium acetate 0.016 g were mixed. This mixture was well kneaded with a two roll heated to 80 ° C to form a thickness of about 0.8 mm, and this was heated and pressed to 150 ° C with a press regulated by a spacer to form an interlayer film with a thickness of 0.76 mm. Got

The interlayer film for laminated glass was 305 mm ×
The ITO of the conductive glass is cut between the conductive glass (thickness: 2.5 mm) and the float glass (thickness: 2.5 mm), which is cut into 305 mm and has the same size glass / ITO structure.
The layers were laminated with the layers on the inside and prebonded with a roll. Then, in an autoclave at 130 ° C, 13 kg /
A laminated glass was manufactured by pressure bonding with a pressure of cm ² . With respect to this laminated glass, a Pammel test was conducted before and after irradiation with ultraviolet rays. The results are shown in Table 2.

[0061]

Embedded image

Comparative Example 2 Comparative Example 1 except that the amount of magnesium acetate in Comparative Example 1 was changed to 0.018 g.
A laminated glass was prepared in the same manner as in. With respect to this laminated glass, a Pammel test was conducted before and after irradiation with ultraviolet rays. The results are shown in Table 2.

[0063]

[Table 2]

[0064]

[Table 3] Table 3 shows the data of the interlayer film for laminated glass obtained in the above Examples and Comparative Examples. (Note) In Comparative Examples in Table 3, the interlayer film has a single-layer structure, and the composition of the resin composition used for the single layer is shown in the table.

[0065]

The laminated glass obtained by using the interlayer film for laminated glass of the present invention is imparted with high functionality such as heat ray reflectivity by the metal oxide layer or the metal layer, and in particular, the acetoxy group is bonded to the laminated glass. It is formed from a resin composition containing a polyvinyl acetal resin as a main component in which the molar ratio of the main chain of ethylene groups to the total ethylene groups is 8 to 30 mol% and the degree of acetalization is in the range of 60 to 75 mol%. The adhesiveness adjustment layer has an appropriate adhesiveness to the metal oxide layer or the surface of the metal layer.

The degree of acetalization is 60 to 75 mol%.
The base layer formed from the resin composition consisting of the polyvinyl acetal resin in the range of 3 shows moderate adhesiveness on the glass surface, and is appropriately adjusted without causing a large difference in adhesive force on each surface of the interlayer film for laminated glass. In addition, it is possible to prevent the adhesive strength from deteriorating with time due to outdoor exposure, UV irradiation and temperature.

Therefore, according to the present invention, it is possible to obtain a laminated glass which is excellent in penetration resistance and glass scattering prevention properties for a long period of time and which has high functions such as heat ray reflectivity. Suitable for use in window glass for buildings, etc.

[Brief description of drawings]

FIG. 1 is an exploded cross-sectional view showing a typical example of an interlayer film for laminated glass and a laminated glass of the present invention.

[Explanation of symbols]

 10: Glass Plate 11: Metal Oxide Layer or Metal Layer 20: Intermediate Film for Laminated Glass 21: Adhesion Adjustment Layer of Intermediate Film for Laminated Glass 22: Base Layer of Intermediate Film for Laminated Glass 30: Laminated Glass

Claims (2)

[Claims] 1. An intermediate film for laminated glass, which is sandwiched between a transparent plate having a metal oxide layer or a metal layer formed on at least the inner surface side thereof and a glass plate, and having a degree of acetalization of 60 to 75. A base layer formed of a resin composition containing a polyvinyl acetal resin as a main component in a mol% range, and a mole fraction of the main chain of ethylene groups to which acetoxy groups are bonded to all ethylene groups is 8 to 30 mol%. And an adhesive strength adjusting layer formed from a resin composition containing a polyvinyl acetal resin as a main component and having a degree of acetalization in the range of 60 to 75 mol%, and the adhesive strength adjusting layer is the metal oxide. An interlayer film for laminated glass, which is provided on the surface on the side where the object layer or the metal layer is present. 2. The multi-interlayer film for laminated glass according to claim 1, which is sandwiched between a glass plate and a transparent plate having a metal oxide layer or a metal layer formed on the inner surface side thereof, and which has acetoxy groups. The molar ratio of the main chain of the bonded ethylene groups to all ethylene groups is 8 to 30 mol% and the degree of acetalization is 60.
An adhesive force adjusting layer formed of a resin composition containing a polyvinyl acetal resin as a main component in an amount of ˜75 mol% is adhered so as to be in contact with the metal oxide layer or the metal layer side. Laminated glass.