JP4976612B2 - Laminated glass interlayer film, polyvinyl acetal resin film and laminated glass - Google Patents

Description

【００５７】
【発明の効果】
本発明に係る合わせガラス用中間膜は、コインシデンス効果の緩和によってＴＬ値の低下を防ぎ、かつ広い温度領域において優れた遮音性を長期安定的に発揮し得る。従って、上記合わせガラス用中間膜を使用した合わせガラスは、優れた遮音性を長期安定的に発揮するので、建築物や車両等の窓ガラスとして好適に使用することができる。
積層体の最外層が、末端に少なくとも一つ以上のカルボキシル基をもつ化合物を含有しない合わせガラス用中間膜である場合には、以上述べたように、透明性、耐候性、衝撃エネルギー吸収性、ガラスとの接着性等の合わせガラスとして必要な基本性能を損なうことなく、また、成形性及び取扱い性を損なうことなく、コインシデンス効果の緩和によってＴＬ値の低下を防ぎ、かつ広い温度領域において優れた遮音性を長期安定的に発揮し得る。従って、上記合わせガラス用中間膜を使用した合わせガラスは、優れた遮音性を長期安定的に発揮するので、建築物や車両等の窓ガラスとして好適に使用することができる。
【００５８】
【図面の簡単な説明】
【図１】合わせガラスの遮音性を示す曲線である。[0001]
The present invention relates to an interlayer film for laminated glass , a polyvinyl acetal resin film, and laminated glass.
[0002]
[Prior art]
In general, a laminated glass having a resin film sandwiched between a pair of glass plates is excellent in safety because it does not scatter when broken, and is widely used, for example, as a window glass for vehicles such as automobiles and window glass for buildings. ing.
Among such interlayer films for laminated glass, the polyvinyl butyral resin film plasticized by the addition of a plasticizer combines adhesiveness with glass, tough tensile strength, and high transparency. The laminated glass configured as described above is particularly suitable as a window glass for vehicles.
[0003]
By the way, the sound insulation of the glass plate is expressed as a transmission loss amount according to a change in frequency, and the transmission loss amount is JIS A 4708 according to the sound insulation grade at 500 Hz or more as shown by the solid line in FIG. Each is defined as a fixed value.
In general, the sound insulation of a glass plate is markedly reduced by the coincidence effect in the frequency region centered at 2000 Hz, as indicated by the wavy line in the figure (in the figure, the valley of the wavy line reduces the sound insulation performance due to the coincidence effect). Corresponding, indicating that the predetermined sound insulation performance is not maintained).
[0004]
Here, the coincidence effect means that when a sound wave is incident on a glass plate, the transverse wave propagates on the glass surface due to the rigidity and inertia of the glass plate, and the transverse wave and the incident sound resonate. A phenomenon that occurs.
[0005]
Although conventional laminated glass is excellent in terms of preventing shattering of broken pieces, in terms of sound insulation, in the frequency region centered on 2000 Hz, a decrease in sound insulation performance due to the coincidence effect is unavoidable. It has been demanded.
[0006]
On the other hand, it is known from the equal loudness curve that the human sense is very sensitive in the frequency range of 1000 to 6000 Hz compared to other frequency regions, and the decrease in sound insulation performance due to the coincidence effect is eliminated. Is extremely important for soundproofing.
[0007]
In order to improve the sound insulation performance of the laminated glass, the above-mentioned coincidence effect is relaxed, and the minimum part of the transmission loss caused by the coincidence effect (hereinafter, the transmission loss at the minimum part is referred to as TL value, see FIG. 1). Need to prevent.
Conventionally, as means for preventing a decrease in the TL value, various measures have been proposed, such as an increase in the mass of laminated glass, glass multi-layering, glass area subdivision, and improvement of glass plate indicating means. However, none of these provide a sufficiently satisfactory effect, and the price is not reasonable for practical use.
[0008]
Recently, the demand for sound insulation is increasing. For example, an architectural window glass requires excellent sound insulation near room temperature. That is, the temperature at which the sound insulation property is most excellent (sound insulation performance maximum temperature = TLmax temperature) obtained by plotting the transmission loss (TL value) against the temperature is near room temperature, and the maximum sound insulation property (sound insulation). There is a demand for an excellent sound insulation property that the performance maximum value = TLmax value itself is large.
The same applies to automobiles, and there are an increasing number of places where sound insulation is required, such as wind noise during high speed running and vibration from the engine.
[0009]
Also, considering the actual use, these laminated glasses are exposed to a wide range of environmental temperature changes from low to high temperatures, so they have good sound insulation not only near room temperature but also in a wide temperature range. Required.
However, for example, a conventional laminated glass using a plasticized polyvinyl butyral resin film has a problem that the TLmax temperature is higher than room temperature and the sound insulation is not good near room temperature.
[0010]
For example, JP-A-2-229742 discloses a resin film having a glass transition temperature of 15 ° C. or lower, for example, vinyl chloride-ethylene-glycidyl methacrylate. An intermediate film composed of a laminate of a copolymer resin film and a plasticized polyvinyl acetal resin film has been proposed. However, this interlayer film does not show the performance of sound insulation according to JIS A 4706 exceeding the Ts-35 grade, and the temperature range showing sound insulation is limited, and exhibits good sound insulation over a wide temperature range. It was difficult.
[0011]
Japanese Laid-Open Patent Publication No. 51-106190 proposes a structure that exhibits damping properties in a wide temperature range by laminating two or more resin films having different glass transition temperatures. However, with this structure, it is recognized that vibration damping is improved over a wide temperature range, but there is no description of sound insulation and transparency required for laminated glass, and high impact energy required for safety glass. It did not satisfy the requirements such as absorbability and anti-scattering property when the glass was broken.
[0012]
Thus, among the above-mentioned prior art interlayer films, laminated glass that exhibits excellent sound insulation properties over a long period of time, particularly in a wide temperature range, has not been obtained.
[0013]
[Problems to be solved by the invention]
An object of the present invention is to prevent a decrease in the TL value by alleviating the coincidence effect, and to exhibit an excellent sound insulating property in a wide temperature range for a long period of time, a polyvinyl acetal resin film used therefor, and the It is providing the laminated glass using the intermediate film for laminated glasses.
In view of the above-mentioned problems, the limited object of the present invention is not to impair the basic performance required for laminated glass such as transparency, weather resistance, impact energy absorption, adhesion to glass, etc. An intermediate film for laminated glass that can prevent a decrease in the TL value by relaxing the coincidence effect without damaging the handleability, and can stably exhibit excellent sound insulation in a wide temperature range for a long period of time , a polyvinyl acetal resin film used therefor, and An object of the present invention is to provide a laminated glass using the interlayer film for laminated glass .
[0014]
[Means for Solving the Problems]
The present inventors have found that the sound insulation of the laminated glass depends on the dynamic viscoelastic properties of the interlayer film, and is most influenced by the loss tangent, which is the ratio between the storage elastic modulus and the loss elastic modulus. Therefore, intensive studies were conducted so that the sound insulation of the laminated glass can be maintained well over a wide temperature range by controlling the loss tangent of the interlayer film.
[0015]
The loss tangent of the intermediate film is affected by the glass transition temperature (Tg) of the film itself, and the temperature range indicated by the maximum value of the loss tangent particularly corresponds to the vicinity of Tg of the film. Therefore, for example, in the case of improving the sound insulation in a lower temperature region than the room temperature, it is desirable that the Tg of the film is located near the room temperature. Specifically, a method of increasing the number of plasticizer parts in the film is often used.
[0016]
However, when the number of plasticizer parts in the film is increased, the plasticizer bleeds out from the film to the surface depending on the compatibility between the resin and the plasticizer. When the plasticizer bleeds out on the film surface, the adhesive force between the film and the glass is lowered, which adversely affects the moisture resistance and the like of the laminated glass.
[0017]
As a result of further intensive studies, the Tg of the film is near (or below) the room temperature without adversely affecting the adhesion between the film and the glass, and the sound insulation near the room temperature (or below) is improved. The film configuration was found and the present invention was completed.
[0018]
The interlayer film for laminated glass of the present invention is an interlayer film for laminated glass composed of a laminate of a polyvinyl acetal resin film plasticized with a plasticizer, and at least one layer excluding the outermost layer of the laminate has a terminal. A polyvinyl acetal resin film containing a compound having at least one carboxyl group is used.
[0019]
Hereinafter, the present invention will be described in detail.
A laminated body of polyvinyl acetal resin films is used for the interlayer film for laminated glass of the present invention (hereinafter simply referred to as “intermediate film”).
[0020]
As a method for obtaining the polyvinyl acetal resin, for example, polyvinyl alcohol (hereinafter referred to as PVA) is dissolved in hot water, the obtained PVA aqueous solution is kept at a predetermined temperature, and then an aldehyde and a catalyst are added to the acetal. There is a method in which the reaction is allowed to proceed, and then the reaction solution is kept at a predetermined temperature, and then the resin powder is obtained through the steps of neutralization, water washing and drying.
[0021]
Although PVA used for manufacture of the said polyvinyl acetal resin is not specifically limited, A thing with an average polymerization degree of 500-5000 is preferable, More preferably, it is 1000-3000. When the average degree of polymerization is less than 500, the strength of the resin film and the intermediate film becomes too weak, and the penetration resistance and impact energy absorption when used as laminated glass may be insufficient. It may be difficult to form the film, and the strength of the resin film and the intermediate film may be too strong, resulting in insufficient penetration resistance and impact energy absorption when used as a laminated glass.
[0022]
Examples of the aldehyde used for the production of the polyvinyl acetal resin include formaldehyde, acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, valeraldehyde, n-hexylaldehyde, 2-ethylbutyraldehyde, benzaldehyde, cinnamaldehyde and the like. Can be mentioned.
[0023]
Various polyvinyl acetal resins thus obtained may be used alone or in combination of two or more. Among these, polyvinyl butyral resin obtained by acetalization with n-butyraldehyde is preferable.
By using the polyvinyl butyral resin, the transparency of the resin film and the intermediate film, weather resistance, adhesion to glass, and the like are further improved.
[0024]
The plasticizer used for plasticizing the polyvinyl acetal resin film is not particularly limited, and examples thereof include organic ester plasticizers such as monobasic acid esters and polybasic acid esters, organic phosphoric acids, and organic sub-acids. A phosphoric acid plasticizer such as phosphoric acid is used. Specifically, among monobasic acid ester plasticizers, glycols such as triethylene glycol, tripropylene glycol, and tetraethylene glycol, butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptanoic acid, 2- Examples thereof include glycol esters obtained by reaction with an organic acid such as ethylhexyl acid.
[0025]
Examples of the polybasic acid ester plasticizer include esters obtained by reacting linear or branched alcohols having 4 to 8 carbon atoms with organic acids such as adipic acid, sebacic acid, and azelaic acid. It is done.
Examples of the phosphoric acid plasticizer include tributoxyethyl phosphate, isodecylphenyl phosphate, and the like.
[0026]
Among the plasticizers, for example, triethylene glycol di-2-ethylbutyrate (3GH), triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol din-heptanoate (3G7), triethylene glycol Ethylene glycol-dicaprylate, triethylene glycol-di n-octate, triethylene glycol-di 2-ethylbutyrate, tetraethylene glycol-di n-heptanoate, dihexyl adipate, dibenzyl phthalate, etc. are preferably used, particularly preferably 3GH, 3GO, 3G7, etc. are used.
[0027]
The said plasticizer may be used independently and 2 or more types may be used together.
[0028]
As for the compounding quantity of the plasticizer with respect to the said polyvinyl acetal resin, 30-70 weight part is preferable with respect to 100 weight part of polyvinyl acetal resin.
When the blending amount is less than 30 parts by weight, the plasticization of the polyvinyl acetal resin may be insufficient, and when it exceeds 70 parts by weight, the mechanical properties of the resin film and the interlayer film and the adhesion to glass are insufficient. Sometimes.
[0029]
Among the combinations of the polyvinyl acetal resin and the plasticizer, a combination using a polyvinyl butyral resin as the polyvinyl acetal resin and using at least one selected from 3GH, 3GO, and 3G7 as the plasticizer is particularly preferable.
[0030]
The number of laminated resin film laminates (intermediate films) used in the present invention is not particularly limited as long as it is 3 or more, and may be a multilayer laminate.
For at least one layer excluding the outermost layer of the resin film laminate, a polyvinyl acetal resin film containing a compound having at least one carboxyl group at the terminal is used.
[0031]
The compound having a carboxyl group reacts with the plasticizer in the plasticized polyvinyl acetal resin to promote the plasticizing effect of the plasticizer on the polyvinyl acetal resin. Therefore, even if the plasticizer blending amount relative to the polyvinyl acetal resin is the same, by including this compound, the Tg of the intermediate film moves to the lower temperature side, and the amount of the plasticizer does not change even when the Tg is lowered. No bleeding out to the surface of the interlayer film occurs.
[0032]
Examples of the compound having a carboxyl group include carboxylic acids having 2 to 18 carbon atoms, hydroxycarboxylic acids having 2 to 18 carbon atoms, carboxylic acid condensates having 2 to 18 carbon atoms, and hydroxycarboxylic acids having 2 to 18 carbon atoms. It is preferable to use at least one selected from condensates. Examples of such compounds include stearic acid, 2-ethylbutyric acid, 2-ethylhexanoic acid, castor oil fatty acid, ricinoleic acid, hydrogenated ricinoleic acid, and ricinol. An acid condensate or the like is preferably used.
[0033]
The compounding amount of the compound having a carboxyl group is preferably 0.5 to 50 parts by weight, more preferably 10 to 30 parts by weight with respect to 100 parts by weight of the plasticizer.
When the blending amount is less than 0.5 parts by weight, the function of promoting the plasticizing effect is reduced, and when it exceeds 50 parts by weight, a large amount of carboxyl groups are present in the resin film, so long-term weather resistance may be insufficient. is there.
[0034]
The compound having a carboxyl group is contained in at least one layer excluding the outermost layer of the resin film laminate. The reason is that when this compound is contained in the outermost layer, the Tg of the outermost layer is lowered, and the elastic modulus is accordingly lowered.
In this laminated body, when the elastic modulus of the outermost layer is lowered, workability when handling the laminated body is deteriorated, and the entire laminated body is softened, so that the impact resistance and penetration resistance of the laminated glass are impaired. .
Therefore, a plasticized polyvinyl acetal resin film not containing this compound is used for the outermost layer.
[0035]
The thickness of the entire laminate is preferably 0.3 to 1.6 mm, which is a thickness as a normal intermediate film. The larger the thickness, the better the sound insulation, but it is preferably determined in consideration of the penetration resistance required for laminated glass, and in practice it is preferably set in the above thickness range.
[0036]
As a method for producing the laminate, a method of laminating resin films to be laminated separately, and laminating these resin films between glass plates, a method of integrally molding a laminate of resin films using a multilayer molding machine, etc. Various methods are used.
[0037]
In order to produce a laminated glass by sandwiching the interlayer film composed of the above laminate between glass plates, a method used for producing a normal laminated glass is adopted, for example, the interlayer film is sandwiched between glass plates from both sides, A method of manufacturing by bonding by hot pressing is performed.
[0038]
In addition, as a glass plate used by this invention, not only an inorganic glass plate but organic glass plates, such as a polycarbonate plate and a polymethylmethacrylate board, may be used.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
In order to describe the present invention in more detail, examples are given below, but the present invention is not limited to these examples.
[0040]
Example 1
39 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO) was added to 100 parts by weight of polyvinyl butyral resin (degree of butyralization 68.9 mol%, residual acetyl group amount 0.9 mol%), The mixed mixture was sufficiently kneaded with a mixing roll. A predetermined amount of the obtained kneaded material was held at 150 ° C. for 30 minutes by a press molding machine to obtain a resin film (A) having a thickness of 0.3 mm.
[0041]
Mixing the mixture obtained by adding 39 parts by weight of 3GO to 100 parts by weight of the polyvinyl butyral resin similar to the resin film (A) and further adding 15 parts by weight of 2-ethylhexane to 100 parts by weight of 3GO. It was kneaded thoroughly with a roll. A predetermined amount of the obtained kneaded material was held at 150 ° C. for 30 minutes by a press molding machine to obtain a resin film (B) having a thickness of 0.3 mm.
[0042]
The resin film (A) and the resin film (B) were overlapped so that the laminated structure of the resin films would be A / B / A to obtain an intermediate film composed of a three-layer laminate.
Next, the intermediate film is sandwiched between two float glasses (2 mm thickness, size 300 mm × 300 mm) from both sides, and this unbonded sandwich is placed in a rubber bag and removed at a vacuum degree of 27 kPa for 20 minutes. After gassing, it was transferred to a 90 ° C. oven in a degassed state and kept at this temperature for 30 minutes.
Thus, the sandwich body temporarily bonded by the vacuum press was further thermocompression bonded at a pressure of 1.2 MPa and a temperature of 135 ° C. in an autoclave to produce a transparent laminated glass (test body).
[0043]
(Example 2)
40 parts by weight of triethylene glycol di-2-ethylbutyrate (3GH) is added to and mixed with 100 parts by weight of polyvinyl butyral resin (degree of butyralization 65.9 mol%, residual acetyl group amount 0.9 mol%). The obtained mixture was sufficiently kneaded with a mixing roll. A predetermined amount of the obtained kneaded material was held at 150 ° C. for 30 minutes by a press molding machine to obtain a resin film (A) having a thickness of 0.3 mm.
[0044]
Mixing the mixture obtained by adding 40 parts by weight of 3GH to 100 parts by weight of the polyvinyl butyral resin similar to the resin film (A) and further adding 20 parts by weight of 2-ethylbutyric acid to 100 parts by weight of 3GH. It was kneaded thoroughly with a roll.
A predetermined amount of the obtained kneaded material was held at 150 ° C. for 30 minutes by a press molding machine to obtain a resin film (B) having a thickness of 0.3 mm.
[0045]
A transparent laminated glass (test specimen) was produced from the resin film (A) and the resin film (B) in the same manner as in Example 1.
[0046]
Example 3
Mixture in which 40 parts by weight of triethylene glycol-di-n-heptanoate (3G7) is added to and mixed with 100 parts by weight of polyvinyl butyral resin (degree of butyralization 68.9 mol%, residual acetyl group amount 0.9 mol%) Was sufficiently kneaded with a mixing roll. A predetermined amount of the obtained kneaded material was held at 150 ° C. for 30 minutes by a press molding machine to obtain a resin film (A) having a thickness of 0.3 mm.
[0047]
40 parts by weight of 3G7 is added to 100 parts by weight of the same polyvinyl butyral resin as the resin film (A), and n-hexane is added in a ratio of 30 parts by weight to 3100 parts by weight of 3G7, and the mixed mixture is mixed. Kneaded thoroughly.
A predetermined amount of the obtained kneaded material was held at 150 ° C. for 30 minutes by a press molding machine to obtain a resin film (B) having a thickness of 0.3 mm.
[0048]
A transparent laminated glass (test specimen) was produced from the resin film (A) and the resin film (B) in the same manner as in Example 1.
[0049]
Example 4
39 parts by weight of 3GO is added to 100 parts by weight of the polyvinyl butyral resin as in Example 1, and ricinoleic acid is added in a ratio of 30 parts by weight to 100 parts by weight of 3GO, and the mixed mixture is sufficiently kneaded with a mixing roll. did.
A predetermined amount of the obtained kneaded material was held at 150 ° C. for 30 minutes by a press molding machine to obtain a resin film (B) having a thickness of 0.3 mm.
[0050]
A transparent laminated glass (test body) was produced from the same resin film (A) as in Example 1 and the present resin film (B) in the same manner as in Example 1.
[0051]
(Comparative Example 1)
A resin film (B) was obtained in the same manner as in Example 1 except that 2-ethylhexanoic acid was not added at all. A transparent laminated glass (test body) was produced from the same resin film (A) as in Example 1 and the present resin film (B) in the same manner as in Example 1.
[0052]
( Reference Example 1 ) A transparent laminated glass was formed in the same manner as in Example 1 by using an intermediate film made of a three-layer laminate (laminated structure: B / B / B) of the resin film (B) of Example 1. Produced.
[0053]
The following performance evaluation was performed on the interlayer films and laminated glass (test bodies) obtained in Examples 1 to 4 , Comparative Example 1 and Reference Example 1 , and the results are shown in Table 1.
(1) Handling property of intermediate film The presence or absence of “stickiness” of an intermediate film having a resin film laminated structure of A / B / A was evaluated by tactile sensation. However, in Reference Example 1 , a three-layer laminate of B / B / B was used.
[0054]
(2) Penetration resistance test In accordance with JIS R 3212, the laminated glass (test body) is held horizontally by a support frame of 30 cm x 30 cm and weighs 2.26 kg from above the test body at a temperature of 23 ° C. The steel balls were allowed to fall freely into the center of the specimen. The test was repeated while gradually increasing the drop height of the steel ball, and the drop height (m) was defined as the distance from the glass surface when 50% of the test specimens were able to prevent penetration of the steel ball. The higher the drop height, the better the penetration resistance of the laminated glass.
[0055]
(2) Sound insulation test At a predetermined temperature, the laminated glass (test body) is vibrated by a vibration generator for vibration test ("vibrator G21-005D" manufactured by KENKEN Co., Ltd.), and vibration characteristics obtained therefrom are obtained. Then, it was amplified with a mechanical impedance amplifier ("XG-81" manufactured by Orion), and the vibration spectrum was analyzed with an FFT analyzer ("FFT Spectrum Analyzer HP-3582AA" manufactured by Yokogawa Hewlett-Packard).
The transmission loss was calculated from the ratio between the loss coefficient thus obtained and the resonance frequency of the glass. Based on this result, the TL value was defined as the minimum transmission loss near the frequency of 2000 Hz. The measurement was performed at intervals of 10 ° C between 0-30 ° C.
[0056]
[Table 1]

[0057]
【Effect of the invention】
The interlayer film for laminated glass according to the present invention can prevent a decrease in TL value by relaxing the coincidence effect, and can stably exhibit excellent sound insulation in a wide temperature range for a long period of time. Therefore, the laminated glass using the interlayer film for laminated glass exhibits excellent sound insulation properties stably for a long period of time, and can be suitably used as a window glass for buildings and vehicles.
The outermost layer of the laminate, as if the end is the interlayer film for a laminated glass containing no compound having at least one or more carboxyl groups, mentioned above, transparency, weatherability, impact energy absorbency, Without impairing the basic performance required for laminated glass such as adhesiveness with glass, and without compromising moldability and handleability, the coincidence effect is alleviated to prevent a decrease in TL value, and excellent in a wide temperature range Sound insulation can be demonstrated stably over the long term. Therefore, the laminated glass using the interlayer film for laminated glass exhibits excellent sound insulation properties stably for a long period of time, and can be suitably used as a window glass for buildings and vehicles.
[0058]
[Brief description of the drawings]
FIG. 1 is a curve showing sound insulation of laminated glass.

Claims (4)

An interlayer film for laminated glass comprising a laminate of a polyvinyl acetal resin film plasticized with a plasticizer, wherein at least one layer excluding the outermost layer of the laminate contains a plasticizer and has 2 to 18 carbon atoms A plasticizer comprising at least one selected from the group consisting of a carboxylic acid of 1 to 8, a hydroxycarboxylic acid having 2 to 18 carbon atoms, a carboxylic acid condensate having 2 to 18 carbons and a hydroxycarboxylic acid condensate having 2 to 18 carbons. An interlayer film for laminated glass, characterized in that a polyvinyl acetal resin film containing 10 to 50 parts by weight with respect to 100 parts by weight is used. An interlayer film for laminated glass comprising a laminate of a polyvinyl acetal resin film plasticized with a plasticizer, wherein at least one layer excluding the outermost layer of the laminate contains a plasticizer and has 2 to 18 carbon atoms A plasticizer comprising at least one selected from the group consisting of a carboxylic acid of 1 to 8, a hydroxycarboxylic acid having 2 to 18 carbon atoms, a carboxylic acid condensate having 2 to 18 carbons and a hydroxycarboxylic acid condensate having 2 to 18 carbons. A polyvinyl acetal resin film containing 0.5 to 50 parts by weight with respect to 100 parts by weight is used,
An interlayer film for laminated glass, wherein the outermost layer of the laminate does not contain a compound having at least one or more carboxyl groups at its ends. A polyvinyl acetal resin film used to obtain an interlayer film for laminated glass comprising a laminate of a polyvinyl acetal resin film plasticized with a plasticizer, and used as at least one layer excluding the outermost layer of the laminate,
It contains a plasticizer and comprises a carboxylic acid having 2 to 18 carbon atoms, a hydroxycarboxylic acid having 2 to 18 carbon atoms, a carboxylic acid condensate having 2 to 18 carbon atoms and a hydroxycarboxylic acid condensate having 2 to 18 carbon atoms. A polyvinyl acetal resin film containing 10 to 50 parts by weight of at least one selected from the group with respect to 100 parts by weight of a plasticizer.   A laminated glass, wherein the interlayer film for laminated glass according to claim 1 or 2 is interposed between and integrated with at least a pair of glass plates.

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