JP2000272937A - Interlayer for laminated glass, and laminated glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interlayer for laminated glass, and the laminated glass, capable of inhibiting a decline in a TL value by relaxing coincidence effect without impairing basic performances necessary for laminated glass such as transparency, weather resistance, impact energy absorbency, adhesiveness to glass or the like and also without impairing formability and operatability of the interlayer and capable of stably exhibiting an excellent sound insulating performance at a wide temperature region for a long term. SOLUTION: This interlayer for laminated glass is produced by alternately laminating (A) a plasticized polyvinyl acetal resin layer having the maximum loss tangent value existing at a temperature of (x) deg.C [wherein, (x) is 20-40], measured by dynamic viscoelastic measurement and (B) a plasticized polyvinyl acetal resin layer having the maximum loss tangent value existing at a temperature of (y) deg.C [wherein, (y) is 0-10], measured in the same way so as for the layer A to become the outermost layers. The loss tangents of the laminated layers A and B have their maximum values at (x+5)-(x+15) deg.C and at (y-15)-(y-5) deg.C, respectively. This laminated glass is produced using the same interlayer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an interlayer film for laminated glass and a laminated glass, and more particularly to an interlayer film for laminated glass and a laminated glass having excellent sound insulation performance.

[0002]

2. Description of the Related Art A laminated glass in which an adhesive resin film commonly called an interlayer film is sandwiched between a pair of glass plates, suppresses the scattering of broken pieces at the time of breakage and prevents the damage from spreading. Since it is excellent in safety, it is widely used, for example, for window glasses of vehicles such as automobiles and buildings.

Among such interlayer films for laminated glass, a polyvinyl butyral resin film plasticized by adding a plasticizer has good adhesion to glass, strong tensile strength, and does not distort a perspective image. It has both high transparency and the like, and a laminated glass using this film is particularly suitably used for a window glass of a vehicle that requires high safety during traveling.

[0004] Furthermore, these laminated glasses have a vehicle having comfortable interior and a maximum temperature of sound insulation performance (hereinafter referred to as TL _max temperature) near room temperature, which can block wind noise and body vibration noise. , Maximum sound insulation performance (hereinafter, T
L _max hereinafter) housing holding a comfortable living space by blocking noise outside by the use of itself is large sound insulating material, it has led to an office or the like is required. In general, the sound insulation performance is represented as a transmission loss amount corresponding to a change in frequency, and the transmission loss amount is determined by JI as shown by a solid line in FIG.
In SA 4708, in the frequency region of 500 Hz or more, each is defined as a constant value according to the sound insulation class. By the way, as shown by the broken line in FIG. 1, the sound insulation of the glass plate is remarkably reduced due to the coincidence effect in the frequency region around 2000 Hz (the valley of the curve shown by the broken line in FIG. This indicates that the sound insulation performance is deteriorated due to the above, and the above-mentioned JIS standard is not satisfied).

[0005] On the other hand, it is known that human hearing has a very high sensitivity in the range of 1000 to 6000 Hz as compared with other frequency regions from an equal loudness curve, and it is necessary to eliminate a decrease in sound insulation performance due to a coincidence effect. Is extremely important for soundproofing.

[0006] To improve the sound insulation performance of laminated glass,
It is necessary to mitigate the above-mentioned coincidence effect and to suppress the generation of a minimum portion (hereinafter, referred to as a TL value) of transmission loss indicated by an arrow in FIG. Conventionally, means for preventing a decrease in the TL value include increasing the mass of a laminated glass, forming a multilayer glass,
Various improvement measures have been proposed, such as subdividing the glass area and improving the glass plate indicating means. However, none of these measures leads to a sufficient improvement in the sound insulation performance, and is not sufficient for practical use in terms of cost.

The inventor of the present application has previously disclosed in Japanese Patent Application Laid-Open No.
In JP-A No. 4 (1994) -204, in order to improve the sound insulation performance of a laminated glass, a film comprising a polyvinyl acetal having 6 to 10 carbon atoms of an acetal group and a plasticizer, and a polyvinyl having 1 to 4 carbon atoms of an acetal group We propose an interlayer film for laminated glass in which a film made of acetal and a plasticizer is laminated,
The sound insulation performance was improved, and the sound insulation effect showed little fluctuation due to temperature change.

That is, the characteristics of these two layers are weighted by laminating two films having different temperature dependencies of the sound insulation performance, and the sound insulation performance of the laminated film is improved over a wide temperature range. Was. Usually, in order to improve the sound insulation performance in a wide temperature range by laminating two or more films,
It is selected from those in which the sound insulation performance of the film to be additionally laminated is shifted to the lower temperature side in consideration of the adhesiveness and the like. However, a film whose sound insulation performance has been shifted to a lower temperature side tends to be too soft, and in view of the formability and handleability of an actual intermediate film, there is a method for improving the sound insulation performance by laminating the above two films. There are restrictions on its range. Further, although it has been conventionally sought to improve the temperature characteristics of the individual intermediate films in a wide temperature range, it is extremely difficult to further improve them.

[0009]

SUMMARY OF THE INVENTION In view of the above facts, the present invention has been made without impairing the basic performance required for laminated glass such as transparency, weather resistance, impact energy absorption, and adhesion to glass. For laminated glass that can alleviate the coincidence effect and suppress the decrease in TL value without deteriorating the moldability and handleability of the interlayer film, and can exhibit excellent sound insulation performance over a wide temperature range stably for a long period of time. An object is to provide an interlayer film and a laminated glass.

The inventor of the present application has noticed that the sound insulation performance of laminated glass is affected by the dynamic characteristics of the interlayer film.
Intensive study of the relationship with the dynamic properties of the interlayer film, especially that the loss tangent (tan δ), which is the ratio between the dynamic storage modulus and the dynamic loss modulus, has a strong correlation with the sound insulation performance of laminated glass Was found. Based on this fact, the above object was achieved by controlling the loss tangent of the intermediate film, and the present invention was completed.

[0011]

The interlayer film for laminated glass according to the present invention has a maximum value of loss tangent measured from dynamic viscoelasticity at x (x = 20 to 40) ° C. The polyvinyl acetal resin layer (A) and the plasticized polyvinyl acetal resin layer (B) whose similarly measured maximum loss tangent is y (y = 0 to 10) ° C. are the outermost layer. An interlayer film for laminated glass which is alternately laminated so that the loss tangent of the laminated film is (x + 5) to
(X + 15) ° C. and (y-15) to (y-5) ° C., each having a maximum value.

The interlayer film for laminated glass according to the invention of claim 2 is the interlayer film for laminated glass according to claim 1, wherein
The maximum value of the loss tangent of the layer (B) in which the same number of plasticizers of the same type as that of the layer (A) are mixed is (x
-30) to (x-5) ° C.

According to a third aspect of the present invention, there is provided a laminated glass comprising the interlayer film for a laminated glass according to the first or second aspect.

The dynamic viscoelasticity of the plasticized polyvinyl acetal resin layers (A) and (B) used in the present invention is as follows:
The loss tangent is measured in accordance with JIS K 7198, and the loss tangent is obtained by measuring a dynamic storage modulus (E ′) and a dynamic loss modulus (E ″) as dynamic viscoelastic properties. The specific measurement method and the like will be described in detail in Examples.

The plasticized polyvinyl acetal resin layer (A) has excellent sound insulation performance at room temperature and higher temperatures, and retains the same, and has mechanical properties such as film strength during work and so-called waist strength. And is responsible for the main structure of the interlayer.
Therefore, the temperature (x) at which the loss tangent of the layer (A) is maximized
Is limited to 20-40 ° C. Maximum loss tangent is 2
If the temperature is lower than 0 ° C, good sound insulation performance in the target temperature range cannot be secured. If the temperature is higher than 40 ° C, the sound insulation performance shifts to a higher temperature side, and the sound insulation performance in a middle temperature range around room temperature. In addition, the film itself is hardened, so that the formability is deteriorated, the rigidity is increased, and the handleability is deteriorated.

On the other hand, the plasticized polyvinyl acetal resin layer (B) has excellent sound insulation performance on the low-temperature side below room temperature and has a function of maintaining the sound insulation performance. Limited to 10 ° C. If the maximum value of the loss tangent is lower than 0 ° C., the film itself becomes soft, so that the formability and handleability are deteriorated. In addition, a laminated glass using the same can prevent foreign matter from breaking through the glass at the time of collision or the like. When the blocking performance, for example, the penetration resistance is lowered and becomes higher than 10 ° C., the value of the loss tangent in the layer (A) approaches, the sound insulating performance on the low temperature side decreases, and the good sound insulating performance in a wide temperature range due to lamination. Cannot be secured.

The loss tangent of the laminated film of the plasticized polyvinyl acetal resin layers (A) and (B) is determined by
With the transfer of the plasticizer, the maximum values are exhibited at (x + 5) to (x + 15) ° C and (y-15) to (y-5) ° C. When the maximum value on the high temperature side is lower than (x + 5) ° C. or the maximum value on the low temperature side is lower than (y−15) ° C., the maximum value of the loss tangent of the laminated film is low. The sound insulation performance on the high-temperature side decreases, and good sound insulation performance over a wide temperature range due to lamination cannot be ensured. The maximum value on the high-temperature side is higher than (x + 15) ° C., or the maximum value on the low-temperature side is (y− 5) If the temperature is higher than 0 ° C., the maximum values of the two loss tangents are too far apart on the temperature axis, so that the sound insulation performance on the low temperature side is reduced and the sound insulation performance in the middle temperature range is also partially reduced. As a result, good sound insulation performance over a wide temperature range due to lamination cannot be ensured, so that the temperature at which each local maximum value of the loss tangent of the laminated film exists is limited to the above range.

If the temperature range in which the maximum values x and y of the loss tangents of the layer (A) and the layer (B) exist, the above range is satisfied.
The loss tangent of the laminate obtained by alternately laminating these materials is (x + 5) to (x + 15) ° C. and (y−1) with the transfer of the plasticizer.
5) to (y-5) ° C., each of which exhibits a maximum value.

When the types and amounts of the plasticizers blended in the layer (A) and the layer (B) are the same, the layer (A)
It is preferable that the maximum value of the loss tangent of the layer (B) exists in the temperature range of (x−30) to (x−5) ° C. with respect to the maximum value x of the loss tangent of the layer (B). If the maximum value of the loss tangent of the layer (B) is higher than (x-5) ° C. in the above-mentioned plasticizer composition, the phase of the polyvinyl acetal resin constituting the layers (A) and (B) with respect to the plasticizer The difference in solubility becomes small, and it becomes difficult to obtain a sound insulation performance in a wide temperature range by laminating both the layer (A) and the layer (B). The difference between the compatibility of the plasticizer with the polyvinyl acetal resin constituting the layer (B) and the polyvinyl acetal resin constituting the layer (B) becomes too large, and when the two layers are alternately laminated, the layer (A) and the layer (B) )
It takes a long time from the start of plasticizer transfer to stabilization until the stabilization, and not only the handling becomes difficult, but also there is a possibility that long-term durability may have a problem. More preferably, (x
-20) to (x-10) ° C.

The polyvinyl acetal resin used in the present invention is obtained by reacting polyvinyl alcohol with aldehyde. Among them, polyvinyl butyral resin obtained by reacting butyraldehyde is preferably used.

The plasticizer is not particularly restricted but includes, for example, organic ester plasticizers such as monobasic acid ester type and polybasic acid ester type, and organic phosphoric acid type and organic phosphorous acid. Examples include acid-based and other phosphoric acid-based plasticizers. Among the monobasic acid ester-based plasticizers, among others, triethylene glycol is obtained by the reaction of butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptanoic acid, 2-ethylhexylic acid, fatty acid such as adipic acid. The glycol-based ester used is preferably used. As the phosphoric acid plasticizer, tributoxyethyl phosphate and isodecylphenyl phosphate are preferably used. These plasticizers used for the polyvinyl acetal resin of the layer (A) and the layer (B) may be the same or different, and a plurality of plasticizers may be mixed in one layer. It may be used.

Layer (A) of interlayer film for laminated glass of the present invention
The layer form of the polyvinyl acetal resin film of the layer (A) and the layer (B) is such that the outermost layer is the layer (A).
Are alternately stacked. Specifically, a lamination form such as layer (A) / layer (B) / layer (A), layer (A) / layer (B) / layer (A) layer (B) / layer (A), and the like can be given. .
Incidentally, even when the layered structure of layer (A) / layer (B) / layer (B) / layer (A) is adopted, the interface between layer (A) and layer (B) is layer (A) / layer (B). ) / Layer (A), so in the present invention, it is not counted as four layers but is classified into three layers.

The lamination ratio (thickness ratio) between the layer (A) and the layer (B) is preferably from 1: 1 to 1: 4. By increasing the lamination ratio of the layer (B) as compared with the layer (A), it is possible to further improve the sound insulation performance near room temperature and at a lower temperature side. However, when the lamination ratio of the layer (B) in the lamination ratio is higher than 1: 4, the rigidity of the intermediate film formed of the laminated film is reduced, the mechanical strength of the obtained intermediate film is reduced, and the production of laminated glass is not performed. On the contrary, when the lamination ratio of the layer (A) in the lamination ratio is higher than 1: 1, it is difficult to further enhance the sound insulation performance near room temperature. A more preferred lamination ratio is
1: 2 to 1: 3.

The thickness of the interlayer for laminated glass of the present invention is as follows:
Although not particularly limited, the thicker the interlayer, the better the sound insulation performance is, but the required performance as a laminated glass such as penetration resistance tends to decrease, so that it is preferably used normally. 0.3 to 1.6 mm as in the case of the interlayer film for laminated glass.

The means for producing the interlayer film for laminated glass of the present invention is not particularly limited. For example, the plasticized polyvinyl acetal resin films of the layer (A) and the layer (B) are formed respectively. , A method of laminating and sandwiching and laminating and integrating plasticized polyvinyl acetal resins of layers (A) and (B) using a multi-layer extruder for laminated glass when laminated glass is manufactured Examples of the method include a method of manufacturing an intermediate film.

The means for producing a laminated glass using the interlayer film for laminated glass of the present invention is not particularly limited. For example, as used in the production of ordinary laminated glass, an intermediate layer between glass plates is used. A method in which a film is sandwiched and laminated and integrated by a hot-press is used. The laminated glass of the present invention is, in addition to the above, a glass plate and the like, for example, a transparent polycarbonate resin plate, an acrylic resin plate and the like, in which an interlayer is laminated and integrated, a transparent polycarbonate resin plate, This also includes one obtained by laminating and integrating an intermediate film between acrylic resin plates.

As described above, the interlayer film for a laminated glass of the present invention has a maximum value of loss tangent measured from dynamic viscoelasticity of x (x = 20 to 40) ° C. A) and a plasticized polyvinyl acetal resin layer (B) having a similarly measured maximum loss tangent at y (y = 0 to 10) ° C. are alternately arranged such that the layer (A) is the outermost layer. The laminated film has a loss tangent of (x + 5) to (x + 15) ° C. and (y-15) to along with the transfer of the plasticizer after lamination.
(Y-5) each having a maximum value at ° C, without impairing the basic performance required for laminated glass such as transparency, weather resistance, impact energy absorption, adhesion to glass, etc .; It is possible to alleviate the coincidence effect, suppress the decrease in the TL value, and stably exhibit excellent sound insulation performance over a wide temperature range for a long period of time without impairing the moldability and handleability.

Further, the interlayer film for laminated glass of the present invention comprises:
By sandwiching the polyvinyl acetal resin film of the soft layer (B) between the layers (A) in a sandwich shape, the mechanical strength of the laminated film is good, and the handling property is good. Further, since the layer (A) and the layer (B) are alternately laminated, the contact area between the layer (A) and the layer (B) increases, and the plasticizer between the layers in the laminated film increases. The transition is performed quickly and uniformly, the process proceeds efficiently, and good properties of the interlayer including the sound insulation performance can be exhibited.

The interlayer film for a laminated glass according to the invention of claim 2 has a loss tangent of a layer (B) in which the same number of plasticizers of the same type as that of the layer (A) are mixed. Although the maximum value is in the temperature range of (x-30) to (x-5) ° C, since the same type of plasticizer is blended in the same number of parts, the transfer amount of the plasticizer is small, In the laminated film in which the layer (B) and the layer (A) are alternately laminated, the loss tangent is (x + 5) to (x +
15) It has a maximum value at each of (° C) and (y-15) to (y-5) ° C, and is a basic element required for laminated glass such as transparency, weather resistance, impact energy absorption, and adhesion to glass. Without impairing the performance, the moldability of the interlayer,
It is possible to alleviate the coincidence effect and suppress the decrease in the TL value without impairing the handleability, and to exhibit excellent sound insulation performance over a wide temperature range in a long-term stable manner.

The laminated glass according to the third aspect of the present invention sandwiches the above-described interlayer film for a laminated glass of the present invention, and thus exhibits long-term stable excellent sound insulation performance in a wide temperature range. Is what you can do.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

(Example 1) [Preparation of film for plasticized polyvinyl acetal resin layer (A)] Polyvinyl butyral resin (butyralization degree: 6)
(5.9 mol%, acetyl group content: 0.9 mol%) 100 parts by weight of triethylene glycol di-2- as a plasticizer
40 parts by weight of ethyl butyrate (3GH) were added, and the mixture was sufficiently kneaded with a mixing roll, and 150 kneaded with a press molding machine.
The film was held at 30 ° C. for 30 minutes to prepare a film for a plasticized polyvinyl acetal resin layer (A) having a thickness of 0.2 mm.

[Preparation of Film for Plasticized Polyvinyl Acetal Resin Layer (B)] Polyvinyl butyral resin (butyralization degree: 60.2 mol%, acetyl group content: 11.9 mol%) 60 parts by weight of ethylene glycol-di-2-ethyl butyrate (3GH) is added, and the mixture is sufficiently kneaded with a mixing roll, and kept at 150 ° C. for 30 minutes by a press molding machine to obtain a plasticized polyvinyl resin having a thickness of 0.4 mm. A film for an acetal resin layer (B) was produced.

[Preparation of Intermediate Film] The obtained film for the plasticized polyvinyl acetal resin layer (A) and the film for the plasticized polyvinyl acetal resin layer (B) were laminated in a layer (A) / layer (B) / The layers were stacked so as to form the layer (A), and allowed to stand at room temperature for 96 hours (4 days) to produce an intermediate film.

[Measurement of maximum value and maximum value of loss tangent] As a measuring device, a solid viscoelasticity measuring device RSA-II manufactured by Rheometrics Co., Ltd. was used. 10mm x 16m from the intermediate film laminated with
m rectangular samples were prepared, and a sinusoidal strain having a frequency of 10 Hz was applied to them in the shear direction at a strain amount of 0.1%. The measurement temperature range is -50 to + 100 ° C, and the rate of temperature rise is 3 ° C / min.
The dynamic storage modulus (E ') and the dynamic loss modulus (E ") were measured, and the maximum value and the maximum value of the loss tangent were calculated from E" / E'. Table 1 shows the measurement results.

[Preparation of Laminated Glass] The obtained intermediate film was sandwiched between two float glasses each having a thickness of 3 mm and a side of 300 mm each in a square shape, placed in a rubber bag, and placed in a rubber bag at a vacuum of 20 torr. After degassing for 20 minutes, the sample was transferred to an oven at 90 ° C. while maintaining the degassed state, and kept at this temperature for 30 minutes. The laminated glass temporarily bonded by the vacuum press was then thermocompression-bonded in an autoclave at a pressure of 12 kg / cm ² and a temperature of 135 ° C. to produce a transparent laminated glass.

[Evaluation of Sound Insulation Performance] As a test device, a vibration generator (manufactured by Shinken Co., Ltd., “G21
-005D ”), and the vibration characteristics obtained therefrom are measured by using a mechanical impedance amplifier (Rion,“ X
G-81 "), and analyze the vibration spectrum with an FFT analyzer (" FFT Spectrum Analyzer HP-3582AA ", manufactured by Yokogawa Hewlett-Packard Company). From the ratio between the loss coefficient and the resonance frequency with glass,
The transmission loss was calculated. Based on this result, the frequency 200
The minimum value of the transmission loss around 0 Hz was defined as the TL value. In addition, the measurement was performed about five points of 0 degreeC, 10 degreeC, 20 degreeC, 30 degreeC, and 40 degreeC. Table 1 shows the measurement results.

(Example 2) In place of the layer (A) of Example 1,
Polyvinyl butyral resin (butyralization degree: 68.9)
Mol%, acetyl group content: 0.9 mol%) using a resin composition comprising 39 parts by weight of triethylene glycol-di-2-ethylhexanoate (3GO) as a plasticizer in 100 parts by weight of the layer (B). A laminated glass was produced in the same manner as in Example 1, except that 60 parts by weight of triethylene glycol-dienanthate (3G7) was used instead of the plasticizer of (1). The measurement of the maximum value and the maximum value of the loss tangent and the evaluation of the sound insulation performance were performed in the same manner as in Example 1. Table 1 shows the test results.
It was shown to.

(Example 3) Instead of the plasticizer of the layer (A) of Example 2, 39 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO) was used, and the plasticizer of the layer (B) was used. Triethylene glycol-dienanthate (3G
Except having changed the compounding quantity of 7) into 65 weight parts, it carried out similarly to Example 2, and produced the laminated glass. The measurement of the maximum value and the maximum value of the loss tangent and the evaluation of the sound insulation performance were performed in Example 1.
The same was done. The test results are shown in Table 1.

(Example 4) The thickness of the layer (A) in Example 1 was changed to 0.1 mm, the thickness of the layer (B) was changed to 0.2 mm, and the lamination structure was changed to the layer (A) / A laminated glass was produced in the same manner as in Example 1, except that the layer was composed of five layers: layer (B) / layer (A) / layer (B) / layer (A). The measurement of the maximum value and the maximum value of the loss tangent and the evaluation of the sound insulation performance were performed in the same manner as in Example 1. The test results are shown in Table 1.

(Example 5) Instead of the layer (A) of Example 1,
Polyvinyl butyral resin (butyralization degree: 66.2)
Layer (B) using a resin composition obtained by adding 40 parts by weight of triethylene glycol-di-2-ethylbutyrate (3GH) as a plasticizer to 100 parts by weight of a plasticizer. Instead of polyvinyl butyral resin (butyralization degree: 60.5 mol%, acetyl group amount: 1)
A laminated glass was produced in the same manner as in Example 1, except that the same type and the same amount of the resin composition as the layer (A) were used as a plasticizer in 100 parts by weight of (1.8 mol%). The measurement of the maximum value and the maximum value of the loss tangent and the evaluation of the sound insulation performance were performed in the same manner as in Example 1. The test results are shown in Table 1.

Comparative Example 1 A laminated glass was produced in the same manner as in Example 1 except that the amount of the plasticizer in the layer (A) in Example 1 was changed to 25 parts by weight. The measurement of the maximum value and the maximum value of the loss tangent and the evaluation of the sound insulation performance were performed in the same manner as in Example 1. The test results are shown in Table 1.

Comparative Example 2 A laminated glass was produced in the same manner as in Example 1 except that the amount of the plasticizer in the layer (B) in Example 1 was changed to 70 parts by weight. The measurement of the maximum value and the maximum value of the loss tangent and the evaluation of the sound insulation performance were performed in the same manner as in Example 1. The test results are shown in Table 1.

Comparative Example 3 A laminated glass was produced in the same manner as in Example 1 except that the amount of the plasticizer in the layer (B) in Example 1 was changed to 50 parts by weight. The measurement of the maximum value and the maximum value of the loss tangent and the evaluation of the sound insulation performance were performed in the same manner as in Example 1. The test results are shown in Table 1.

Comparative Example 4 The procedure of Example 2 was repeated except that 50 parts by weight of triethylene glycol-di-2-ethylhexanoate (3GO) was used instead of the plasticizer in the layer (B) of Example 2. In the same manner as in Example 2, a laminated glass was produced. The measurement of the maximum value and the maximum value of the loss tangent and the evaluation of the sound insulation performance were performed in the same manner as in Example 1. The test results are shown in Table 1.

[0046]

[Table 1]

As is clear from Table 1, the laminated glasses of Examples 1 to 5 exhibited high sound insulation performance in the temperature range of 0 to 40 ° C. In particular, the laminated glass of Example 5 had the maximum value of the loss tangent 1 of the laminated body and the maximum value of the loss tangent of the laminated body in spite of the fact that the same plasticizer was blended in the same parts by weight for both the layers (A) and (B) constituting the laminated body. The width between the temperatures indicated by No. 2 showed an appropriate interval, indicating high sound insulation performance. On the other hand, in the laminated glasses of Comparative Examples 1 and 2, the width between the temperatures at which the loss tangents of the layer (A) and the layer (B) show the maximum value is large, and the loss tangent of the laminate in which these are alternately laminated is large. The width between the temperatures showing the maximum values 1 and 2 is large, and in the temperature range of 0 to 40 ° C., a region where the sound insulation performance is reduced around 10 to 30 ° C. has been created. On the other hand, in the laminated glasses of Comparative Examples 3 and 4, the width between the temperatures at which the loss tangents of the layer (A) and the layer (B) showed the maximum value were too close to each other. The width between the temperatures showing values 1 and 2 also approaches,
It can be seen that the sound insulation performance on the low temperature side below about 10 ° C. has been reduced.

[0048]

The interlayer film for laminated glass of the present invention and the laminated glass using the same are constructed as described above, so that the transparency, weather resistance, impact energy absorption, adhesion to glass, and the like can be improved. Without impairing the basic performance required for glass, and without impairing the moldability and handleability of the interlayer film, it alleviates the coincidence effect and suppresses the decrease in TL value, and has excellent sound insulation performance over a wide temperature range. Can be exhibited stably for a long period of time.

[Brief description of the drawings]

FIG. 1 is a chart showing a transmission loss (dB) corresponding to a frequency (Hz) by a dotted line and a standard value defined by JIS A 4708 by a solid line to explain the sound insulation performance of a laminated glass. In the figure, the arrow indicates the TL value existing around 2000 Hz.

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 4F100 AH02 AH02H AK23A AK23B AK23C BA03 BA04 BA05 BA10 BA10A BA10C BA16 BA26 CA04A CA04B CA04C GB07 GB32 JH01 JK06 JK07A JK07B JK07C JK10 JL19 JL11 JN01 Y01BA01B01 CD02 CD12 CD18

Claims (3)

[Claims] 1. A plasticized polyvinyl acetal resin layer (A) having a maximum loss tangent measured by dynamic viscoelasticity at x (x = 20 to 40) ° C., and a maximum loss tangent measured similarly. An intermediate film for laminated glass, in which a plasticized polyvinyl acetal resin layer (B) having a value of y (y = 0 to 10) ° C. is alternately laminated such that the layer (A) is the outermost layer. , The loss tangent of the laminated film is (x + 5) to (x + 1).
5) An interlayer film for laminated glass, which has a maximum value in each of ° C and (y-15) to (y-5) ° C. 2. The layer (B) in which the same type of plasticizer as that of the layer (A) is blended in the same number of parts has a maximum loss tangent of (x-30) to (x-5). The interlayer film for laminated glass according to claim 1, which is in a temperature range of ° C. 3. A laminated glass comprising the interlayer film for laminated glass according to claim 1 sandwiched therebetween.