JP4125830B2 - Laminated glass interlayer film and laminated glass - Google Patents

Description

（但し、ｎ、ｍは８〜１５の整数、０．５＜ｎ／ｍ＜３．５、ｙは４〜１０の整数である。）
【０００９】
また、請求項２の発明では、少なくとも二枚のガラス板の間に、請求項１記載の合わせガラス用中間膜が接着されていることを特徴とする合わせガラスが提供される。
【００１０】
本発明の中間膜を構成する樹脂としては、ブチラール化度６６〜７２モル％、好ましくは６７．５〜７０．０モル％のポリビニルブチラール樹脂を用いる。ブチラール化度が６６モル％未満では、中間膜が吸湿しやすくなって合わせガラスの周辺部の白化が起こりやくなり、逆にブチラール化度が７２モル％を超えると、中間膜の機械的強度が低下する。なお、残存アセチル基量は、中間膜の透明性、耐熱性、耐候性の点から５モル％以下とするのが好ましい。
【００１１】
また、上記ポリビニルブチラール樹脂の平均重合度は、低くなると中間膜の耐貫通性が低下することがあり、逆に高くなると衝撃強度が高くなりすぎることがあるため、１０００〜２５００のものを用いるのが好ましい。
【００１２】
このようなポリビニルブチラール樹脂を得るには、公知の合成方法が採用される。例えば、ポリビニルアルコールを熱水に溶解し、得られた水溶液を０〜９５℃に保持しておいて、これにｎ−ブチルアルデヒドと酸触媒とを加えてブチラール化反応を進行させ、次いで、反応系の温度を上げて熟成して反応を完結させ、その後、中和、水洗及び乾燥を経て、粉末状のポリビニルブチラール樹脂を得る方法が採用される。
【００１３】
ここで、ポリビニルアルコールとしては、通常、ポリ酢酸ビニルをケン化して得られるものが使用され、残存アセチル基量５モル％以下、ケン化度９５モル％以上、平均重合度１０００〜２５００のポリビニルアルコールを用いるのが好ましい。
【００１４】
上記ポリビニルブチラール樹脂１００重量部に、可塑剤として、トリエチレングリコールジ−２−エチルヘキサノエート３０〜５０重量部が含有される。このトリエチレングリコールジ−２−エチルヘキサノエートは、トリエチレングリコールとその２倍量以上の２−エチルヘキシル酸とを触媒を用いてエステル化反応させることにより得られる。
【００１５】
上記トリエチレングリコールジ−２−エチルヘキサノエートは、揮発性が少ないので安定した性能が得られ、しかも溶融混練の際の作業環境の点でも優れ、また中間膜の合わせ加工の際のトリムカット性にも優れ、さらに、中間膜の低温柔軟性にも優れている。トリエチレングリコールジ−２−エチルヘキサノエートの含有量が３０重量部未満では、合わせガラスの耐貫通性が低下し、逆に５０重量部を越えると、中間膜から可塑剤が滲み出し、合わせガラスの接着性が低下する。
【００１６】
また、上記ポリビニルブチラール樹脂１００重量部に、接着力調整剤として、炭素数３〜１０のモノカルボン酸又はジカルボン酸のマグネシウム塩０．０１〜０．１重量部、好ましくは０．０３〜０．０８重量部が含有される。このようなモノカルボン酸又はジカルボン酸のマグネシウム塩としては、例えば、プロピオン酸マグネシウム、酪酸マグネシウム、２−エチル酪酸マグネシウム、吉草酸マグネシウム、ヘキサン酸マグネシウム、ヘプタン酸マグネシウム、マロン酸マグネシウム、コハク酸マグネシウム、グルタル酸マグネシウム、アジピン酸マグネシウム等が挙げられる。
【００１７】
このようなマグネシウム塩は、中間膜中で電離せずに塩の形で存在し、水分子を引き寄せることにより、ガラス板と中間膜との間の接着力の低下を抑えているものと考えられ、得られる合わせガラスの耐貫通性を良好なものとすることができる。また、これ等のマグネシウム塩は、中間膜中で凝集することなく膜表面に高濃度に分布するため、少量で接着力調整効果を示す。また、吸湿による合わせガラスの周辺部の過度の白化を起こすこともない。
【００１８】
上記マグネシウム塩の含有量が０．０１重量部未満では、良好な接着力調整効果が得られないために、得られる合わせガラスの耐貫通性が低下し、逆に０．１重量部を超えるとブリードアウトして、ガラス板と中間膜との間の接着力が低くなりすぎ、また膜が白濁して得られる合わせガラスの透明性が低下する。これ等の接着力調整剤は単独で用いてもよく、２種以上を併用してもよい。
【００１９】
さらに、上記ポリビニルブチラール樹脂１００重量部に、前記一般式（１）で表される分子量８００〜５０００のシリコンオイル０．０１〜０．２重量部が含有される。このようなシリコンオイルは、ポリシロキサンに変成すべき化合物を反応させて得られるもので、適当な親水性と疎水性を有しており、中間膜中での上記マグネシウム塩の機能を妨害することがないので、ガラス板と中間膜との間の安定な接着力の実現が可能である。また、上記シリコンオイルを含有することにより、中間膜の含水量を特に調節せずに安定した性能が得られる。
【００２０】
このようなシリコンオイルの分子量が８００未満では、中間膜の表面への局在化が低下し、逆に分子量が５０００を超えると、樹脂との相溶性が低下して中間膜の表面にブリードアウトして、得られる合わせガラスの接着力が低下する。特に、シリコンオイルの分子量は１５００〜４５００が好ましい。
【００２１】
上記シリコンオイルの含有量が０．０１重量部未満では、吸湿による白化防止効果が不十分になり、逆に０．２重量部を超えるとブリードアウトして、樹脂との相溶性が低下して中間膜の表面にブリードアウトして、ガラス板と中間膜との間の接着力が低下する。特に、シリコンオイルの含有量は０．０１〜０．２重量部が含有される。これ等のシリコンオイルは単独で用いてもよく、２種以上を併用してもよい。
【００２２】
中間膜には、その他、必要に応じて、紫外線吸収剤、光安定剤、酸化防止剤等の公知の添加剤を含有させてもよい。中間膜の膜厚は、合わせガラスとして必要な耐貫通性等を考慮して決められ、従来の中間膜と同程度で、特に０．２〜２ｍｍとするのが好ましい。
【００２３】
本発明の中間膜は、上記ポリビニルアセタール樹脂に所要量のトリエチレングリコールジ−２−エチルヘキサノエート、炭素数３〜１０のモノカルボン酸又はジカルボン酸のマグネシウム塩０．０１〜０．１重量部及び一般式（１）で表される分子量８００〜５０００のシリコンオイルを配合し、さらに必要に応じてその他の添加剤を配合し、これを例えば押出機により混練溶融しシート状に成形して得ることができる。また、ロールで混練溶融した後プレスすることにより得ることもできる。
【００２４】
こうして得られる本発明の中間膜を用いて合わせガラスを製造するには、従来と同様な方法により、少なくとも二枚のガラス板の間に中間膜を挟持して積層体とし、次いでオートクレーブ等の装置を用いてこの積層体を加熱、加圧し、ガラス板と中間膜とを挟着する。こうして、本発明の合わせガラスが得られる。
【００２５】
【発明の実施の形態】
以下、本発明の実施例及び比較例を示す。
（実施例１〜３及び比較例１〜４）
＜ポリビニルブチラール樹脂の合成＞
攪拌装置付きの反応器に、イオン交換水２９００重量部、平均重合度１７００、ケン化度９９．２モル％のポリビニルアルコール１９８重量部（ビニルアルコール４．５モル相当量）を供給し、攪拌しながら９５℃に加熱して溶解した。この水溶液を３０℃に冷却し、これにｎ−ブチルアルデヒド１５２重量部（２．１モル）と３５％塩酸２０８重量部（２．１モル）を加え、次いで液温を２℃に下げてこの温度を保持し、ポリビニルブチラール樹脂が析出した後、液温を３０℃に昇温して５時間保持した。その後、炭酸ナトリウム１５６重量部（１．８モル）を加えて中和し、水洗及び乾燥を行って、ブチラール化度６９モル％、残存アセチル基０．８モル％、平均重合度１７００の粉末状のポリビニルブチラール樹脂を得た。
【００２６】
＜中間膜の作製＞
上記ポリビニルブチラール樹脂１００重量部に、表１に示すように、可塑剤（トリエチレングリコールジ−２−エチルヘキサノエート又はアジピン酸ジ−２−エチルヘキシル）３９重量部、カルボン酸マグネシウム塩（２−エチル酪酸マグネシウム又はデカン酸マグネシウム）０．０４重量部又は０．０５重量部及び前記一般式（１）で表されるシリコンオイル（ｎ、ｍ、ｎ／ｍ、ｙ及び分子量の異なるもの）又は下記一般式（２）で表されるシリコンオイル（比較例４のもの）０．０５重量部を混合して、７種類（実施例３種類、比較例４種類）の混合物を得た。
【００２７】
【化３】

【００２８】
次いで、これ等の各混合物をミキシングロールに供給し、溶融混練して得られる混練物をプレス成形機により１５０℃、１００ｋｇ／ｃｍ² の条件で３０分間プレス成形し、厚さ０．８ｍｍで、６種類（実施例３種類、比較例４種類）の中間膜を得た。
【００２９】
これ等の各中間膜を縦３００ｍｍ×横３００ｍｍに裁断し、これを縦３００ｍｍ×横３００ｍｍ×厚さ２．５ｍｍの二枚のフロートガラスの間に挟着し、この積層体を真空バッグに入れ真空度２０ｔｏｒｒで２０分間保持し、真空にしたままオーブン内で９０℃で３０分間保持した。真空バッグから取り出してこれをオートクレーブ内で１５０℃、１３ｋｇ／ｃｍ² の条件で熱プレスして、７種類（実施例３種類、比較例４種類）の合わせガラスを得た。
【００３０】
これ等の各合わせガラスについて、次の方法で耐湿試験及びパンメル試験を行った。また、これ等の各中間膜について、次の方法で可塑剤の揮発性試験を行った。これ等の結果をまとめて表２に示す。
【００３１】
（１）耐湿試験
合わせガラスを温度８０℃、相対湿度９５％の条件で２週間保管し、その後合わせガラスを取り出し、端縁からの白化距離（ｍｍ）を測定した。
（２）パンメル試験（積水法）
合わせガラスを−１８℃±０．６℃の温度に１６時間調整し、この合わせガラスの中央部（縦１５０ｍｍ×横１５０ｍｍの部分）を頭部が０．４５ｋｇのハンマーで打って、ガラスの粒径が６ｍｍ以下になるまで粉砕し、ガラスが部分剥離した後の膜の露出度を、表１によってパンメル値（積水法）で示した。
【００３２】
【表１】

【００３３】
パンメル値４〜５の範囲の合わせガラスが、耐貫通性及びガラスの飛散防止性が優れるので最も好ましい。パンメル値が３以下では接着力が低くなり、衝撃等によるガラスの飛散防止性が低下する。逆に、パンメル値が６以上になると接着力が高くなり、衝撃等による合わせガラスの耐貫通性が低下する。
【００３４】
（３）可塑剤の揮発性
中間膜を１５０℃のオーブンに１時間放置して加熱し、加熱前及び加熱後の中間膜の重量を測定して、（加熱前重量−加熱後重量）／加熱前重量を百分率で示した。
【００３５】
【表２】

【００３６】
【発明の効果】
上述の通り、本発明によれば、中間膜を構成する各種材料の特定の組み合わせにより、耐湿性に優れ、ガラス板と中間膜との接着力の経時低下が改善され、合わせガラスの周辺部の白化を少なくすることができる。また、透明性、耐貫通性及びガラスの飛散防止性に優れる。したがって、本発明で得られる合わせガラスは、水分や湿気の多い環境下でも問題なく使用することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an interlayer film for laminated glass and laminated glass that are particularly excellent in moisture resistance.
[0002]
[Prior art]
Laminated glass in which an interlayer film made of plasticized polyvinyl butyral resin is sandwiched between at least two glass plates is excellent in transparency, weather resistance, penetration resistance and glass scattering prevention, and is used in automobiles, aircraft and buildings. Widely used for front window glass.
[0003]
This type of laminated glass is required to have high penetration resistance and prevention of glass scattering. In order to improve these performances, it is necessary to appropriately adjust the adhesive force between the glass plate and the interlayer film.
[0004]
In other words, in laminated glass where the adhesive strength between the glass plate and the intermediate film is too small, the glass peels off from the intermediate film due to impact from the outside, and on the contrary, in the laminated glass where the adhesive force between the glass plate and the intermediate film is too large The glass plate and the intermediate film are both broken and penetrated by an external impact.
[0005]
Japanese Patent Publication No. 53-18207 discloses a plasticized polyvinyl butyral resin interlayer containing an alkali metal salt or alkaline earth metal salt of monocarboxylic acid or dicarboxylic acid and a modified silicon oil between at least two glass plates. A laminated glass having improved penetration resistance has been proposed.
[0006]
[Problems to be solved by the invention]
However, the proposed laminated glass does not have sufficient moisture resistance. That is, when such a laminated glass is used for a long time in an environment with a lot of moisture and moisture, the adhesive force between the glass plate and the intermediate film decreases with time, and the peripheral glass plate and the intermediate film There is a problem that moisture and moisture in the atmosphere enter from the interface inward, and the peripheral portion of the laminated glass is whitened.
[0007]
As a result of diligent research to solve the above problems, the present inventor has excellent moisture resistance due to a specific combination of various materials constituting the plasticized polyvinyl butyral resin intermediate film, and adhesion between the glass plate and the intermediate film. As a result, it was found that the deterioration of the property over time could be improved and the whitening of the peripheral part of the laminated glass could be reduced, and the present invention was completed.
[0008]
[Means for Solving the Problems]
That is, in the invention of claim 1, 100 parts by weight of polyvinyl butyral resin having a butyralization degree of 66 to 72 mol%, 30 to 50 parts by weight of triethylene glycol di-2-ethylhexanoate, and a monocarboxylic acid having 3 to 10 carbon atoms. 0.01-0.1 part by weight of magnesium salt of acid or dicarboxylic acid and 0.01-0.2 part by weight of silicon oil having a molecular weight of 800-5000 represented by the following general formula (1) An interlayer film for laminated glass is provided.
[Chemical 2]

(However, n and m are integers of 8 to 15, 0.5 <n / m <3.5, and y is an integer of 4 to 10.)
[0009]
Moreover, in invention of Claim 2, the intermediate film for laminated glasses of Claim 1 is adhere | attached between at least two glass plates, The laminated glass characterized by the above-mentioned is provided.
[0010]
As the resin constituting the interlayer film of the present invention, a polyvinyl butyral resin having a butyralization degree of 66 to 72 mol%, preferably 67.5 to 70.0 mol% is used. If the degree of butyralization is less than 66 mol%, the interlayer film tends to absorb moisture and whitening of the peripheral portion of the laminated glass is likely to occur. Conversely, if the degree of butyralization exceeds 72 mol%, the mechanical strength of the interlayer film is increased. descend. The amount of residual acetyl groups is preferably 5 mol% or less from the viewpoint of the transparency, heat resistance, and weather resistance of the interlayer film.
[0011]
In addition, when the average degree of polymerization of the polyvinyl butyral resin is low, the penetration resistance of the intermediate film may be lowered. Conversely, when the average degree of polymerization is high, the impact strength may be too high. Is preferred.
[0012]
In order to obtain such a polyvinyl butyral resin, a known synthesis method is employed. For example, polyvinyl alcohol is dissolved in hot water, and the resulting aqueous solution is kept at 0 to 95 ° C., to which n-butyraldehyde and an acid catalyst are added to proceed with the butyralization reaction, and then the reaction A method of obtaining a powdery polyvinyl butyral resin through neutralization, washing with water and drying is employed after raising the temperature of the system and aging to complete the reaction.
[0013]
Here, as polyvinyl alcohol, what is usually obtained by saponifying polyvinyl acetate is used, and polyvinyl alcohol having a residual acetyl group amount of 5 mol% or less, a saponification degree of 95 mol% or more, and an average polymerization degree of 1000 to 2500. Is preferably used.
[0014]
As a plasticizer, 30 to 50 parts by weight of triethylene glycol di-2-ethylhexanoate is contained in 100 parts by weight of the polyvinyl butyral resin. This triethylene glycol di-2-ethylhexanoate can be obtained by esterifying a triethylene glycol and 2-ethylhexylic acid at least twice as much using a catalyst.
[0015]
The above triethylene glycol di-2-ethylhexanoate has low volatility, so stable performance is obtained, and it is also excellent in terms of working environment during melt-kneading. In addition, the intermediate film is also excellent in low-temperature flexibility. When the content of triethylene glycol di-2-ethylhexanoate is less than 30 parts by weight, the penetration resistance of the laminated glass is lowered. On the other hand, when it exceeds 50 parts by weight, the plasticizer oozes out from the interlayer film, and the combined The adhesiveness of the glass decreases.
[0016]
In addition, to 100 parts by weight of the polyvinyl butyral resin, 0.01 to 0.1 parts by weight, preferably 0.03 to 0.1 parts by weight, of an magnesium salt of a monocarboxylic acid or dicarboxylic acid having 3 to 10 carbon atoms as an adhesive strength adjusting agent. Contains 08 parts by weight. Examples of the monocarboxylic acid or dicarboxylic acid magnesium salt include, for example, magnesium propionate, magnesium butyrate, magnesium 2-ethylbutyrate, magnesium valerate, magnesium hexanoate, magnesium heptanoate, magnesium malonate, magnesium succinate, Examples include magnesium glutarate and magnesium adipate.
[0017]
Such a magnesium salt is present in the form of a salt without ionization in the intermediate film, and is considered to suppress the decrease in the adhesive force between the glass plate and the intermediate film by attracting water molecules. The penetration resistance of the obtained laminated glass can be made favorable. Moreover, since these magnesium salts are distributed at a high concentration on the film surface without agglomerating in the intermediate film, the effect of adjusting the adhesive force is exhibited even in a small amount. Further, excessive whitening of the peripheral portion of the laminated glass due to moisture absorption is not caused.
[0018]
When the content of the magnesium salt is less than 0.01 parts by weight, a good adhesive force adjusting effect cannot be obtained, and therefore, the penetration resistance of the obtained laminated glass is lowered, and conversely when the content exceeds 0.1 parts by weight. Bleed out, the adhesive force between the glass plate and the interlayer film becomes too low, and the transparency of the laminated glass obtained when the film becomes cloudy is lowered. These adhesive strength modifiers may be used alone or in combination of two or more.
[0019]
Furthermore, 0.01 to 0.2 parts by weight of silicon oil having a molecular weight of 800 to 5000 represented by the general formula (1) is contained in 100 parts by weight of the polyvinyl butyral resin. Such silicone oil is obtained by reacting a compound to be transformed with polysiloxane, has appropriate hydrophilicity and hydrophobicity, and interferes with the function of the magnesium salt in the intermediate film. Therefore, it is possible to realize a stable adhesive force between the glass plate and the interlayer film. Further, by containing the silicon oil, stable performance can be obtained without particularly adjusting the water content of the intermediate film.
[0020]
If the molecular weight of such silicon oil is less than 800, the localization on the surface of the intermediate film is reduced. Conversely, if the molecular weight exceeds 5000, the compatibility with the resin is reduced and the surface of the intermediate film is bleeded out. And the adhesive force of the obtained laminated glass falls. In particular, the molecular weight of silicone oil is preferably 1500-4500.
[0021]
If the content of the silicone oil is less than 0.01 parts by weight, the whitening prevention effect due to moisture absorption becomes insufficient. Conversely, if the content exceeds 0.2 parts by weight, bleeding out occurs and compatibility with the resin decreases. Bleed out to the surface of the intermediate film, and the adhesive force between the glass plate and the intermediate film is reduced. In particular, the content of silicon oil is 0.01 to 0.2 parts by weight. These silicone oils may be used alone or in combination of two or more.
[0022]
In addition, the intermediate film may contain known additives such as an ultraviolet absorber, a light stabilizer, and an antioxidant as necessary. The film thickness of the intermediate film is determined in consideration of the penetration resistance necessary for laminated glass, and is about the same as that of a conventional intermediate film, preferably 0.2 to 2 mm.
[0023]
The intermediate film of the present invention is a polyvinyl acetal resin having a required amount of triethylene glycol di-2-ethylhexanoate, a monocarboxylic acid having 3 to 10 carbon atoms, or a magnesium salt of dicarboxylic acid 0.01 to 0.1 weight. Part and a silicon oil having a molecular weight of 800 to 5000 represented by the general formula (1) are blended, and other additives are blended as necessary, and this is kneaded and melted by, for example, an extruder and formed into a sheet shape. Obtainable. It can also be obtained by kneading and melting with a roll and then pressing.
[0024]
In order to produce a laminated glass using the interlayer film of the present invention thus obtained, an interlayer film is sandwiched between at least two glass plates by a method similar to the conventional method, and then an apparatus such as an autoclave is used. The laminated body is heated and pressurized to sandwich the glass plate and the intermediate film. Thus, the laminated glass of the present invention is obtained.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Examples of the present invention and comparative examples are shown below.
(Examples 1-3 and Comparative Examples 1-4)
<Synthesis of polyvinyl butyral resin>
A reactor equipped with a stirrer is supplied with 2900 parts by weight of ion-exchanged water, 198 parts by weight of polyvinyl alcohol having an average polymerization degree of 1700 and a saponification degree of 99.2 mol% (corresponding to 4.5 moles of vinyl alcohol) and stirring. The solution was heated to 95 ° C to dissolve. The aqueous solution was cooled to 30 ° C., and 152 parts by weight (2.1 mol) of n-butyraldehyde and 208 parts by weight (2.1 mol) of 35% hydrochloric acid were added thereto, and the liquid temperature was lowered to 2 ° C. After maintaining the temperature and depositing the polyvinyl butyral resin, the liquid temperature was raised to 30 ° C. and held for 5 hours. Thereafter, 156 parts by weight (1.8 mol) of sodium carbonate was added for neutralization, followed by washing with water and drying to obtain a powdery form having a butyralization degree of 69 mol%, a residual acetyl group of 0.8 mol%, and an average polymerization degree of 1700. Of polyvinyl butyral resin was obtained.
[0026]
<Production of interlayer film>
As shown in Table 1, 39 parts by weight of a plasticizer (triethylene glycol di-2-ethylhexanoate or di-2-ethylhexyl adipate), a carboxylic acid magnesium salt (2- Magnesium ethyl butyrate or magnesium decanoate) 0.04 parts by weight or 0.05 parts by weight and silicon oil represented by the general formula (1) (n, m, n / m, y and different molecular weights) or the following 0.05 parts by weight of silicone oil represented by the general formula (2) (comparative example 4) was mixed to obtain a mixture of 7 types (3 types of examples and 4 types of comparative examples).
[0027]
[Chemical 3]

[0028]
Next, each of these mixtures is supplied to a mixing roll, and a kneaded product obtained by melt-kneading is press-molded for 30 minutes at 150 ° C. and 100 kg / cm ² with a press molding machine, with a thickness of 0.8 mm, Six types of interlayer films (3 types in Example and 4 types in Comparative Example) were obtained.
[0029]
Each of these intermediate films is cut into a length of 300 mm × width of 300 mm, sandwiched between two float glasses of length 300 mm × width 300 mm × thickness 2.5 mm, and this laminate is placed in a vacuum bag. The vacuum was maintained at 20 torr for 20 minutes, and the vacuum was maintained at 90 ° C. for 30 minutes in an oven. The laminate was taken out from the vacuum bag and hot-pressed in an autoclave under the conditions of 150 ° C. and 13 kg / cm ² to obtain 7 types (3 types of Examples and 4 types of Comparative Examples) of laminated glasses.
[0030]
About each of these laminated glasses, the moisture resistance test and the panmel test were done with the following method. Moreover, the volatility test of the plasticizer was conducted on each of these interlayer films by the following method. These results are summarized in Table 2.
[0031]
(1) Humidity resistance test The laminated glass was stored for 2 weeks under conditions of a temperature of 80 ° C. and a relative humidity of 95%, and then the laminated glass was taken out and the whitening distance (mm) from the edge was measured.
(2) Pummel test (Sekisui method)
The laminated glass was adjusted to a temperature of −18 ° C. ± 0.6 ° C. for 16 hours, and the center portion of this laminated glass (length 150 mm × width 150 mm) was struck with a hammer having a head of 0.45 kg, and the glass particles The film was pulverized until the diameter became 6 mm or less, and the degree of exposure of the film after partial peeling of the glass was shown in Table 1 by the Pummel value (Sekisui method).
[0032]
[Table 1]

[0033]
A laminated glass having a Pummel value of 4 to 5 is most preferable because it is excellent in penetration resistance and glass scattering prevention. When the Pummel value is 3 or less, the adhesive strength is low, and the glass scattering prevention property due to impact or the like is lowered. On the other hand, when the Pummel value is 6 or more, the adhesive strength increases, and the penetration resistance of the laminated glass due to impact or the like decreases.
[0034]
(3) The plasticizer volatile intermediate film is allowed to stand in an oven at 150 ° C. for 1 hour and heated, and the weight of the intermediate film before and after heating is measured, and (weight before heating−weight after heating) / heating The previous weight was expressed as a percentage.
[0035]
[Table 2]

[0036]
【The invention's effect】
As described above, according to the present invention, due to the specific combination of various materials constituting the interlayer film, the moisture resistance is excellent, the deterioration of the adhesive force between the glass plate and the interlayer film is improved, and the peripheral portion of the laminated glass is improved. Whitening can be reduced. Moreover, it is excellent in transparency, penetration resistance, and prevention of glass scattering. Therefore, the laminated glass obtained by the present invention can be used without any problem even in an environment with a lot of moisture and moisture.

Claims (2)

100 parts by weight of polyvinyl butyral resin having a butyralization degree of 66 to 72 mol%, 30 to 50 parts by weight of triethylene glycol di-2-ethylhexanoate, and a magnesium salt of a monocarboxylic acid or dicarboxylic acid having 3 to 10 carbon atoms. An interlayer film for laminated glass characterized by containing 0.01 to 0.1 part by weight and 0.01 to 0.2 part by weight of silicon oil having a molecular weight of 800 to 5000 represented by the following general formula (1) .

(However, n and m are integers of 8 to 15, 0.5 <n / m <3.5, and y is an integer of 4 to 10.) A laminated glass, wherein the interlayer film for laminated glass according to claim 1 is sandwiched between at least two glass plates.