JP4966583B2 - Intermediate film for transparent laminate and transparent laminate - Google Patents

Description

The present invention provides an intermediate film for a transparent laminate having excellent adhesion to a transparent glass plate and a transparent resin plate and having excellent sound insulation performance near room temperature, and a transparent laminate using the intermediate film for the transparent laminate About.

Conventionally, laminated glass has been widely used for windshields and side glasses of automobiles, or for window glass of buildings. As a typical example of such a laminated glass, an interlayer film for laminated glass made of a plasticized polyvinyl acetal resin film such as polyvinyl butyral resin plasticized with a plasticizer is interposed between at least two transparent glasses. And manufactured by integrating them.

Such a laminated glass breaks the glass when an impact is applied, but the intermediate film interposed between the glass does not easily break, and the glass remains adhered to the intermediate film even after the breakage. Since the fragments are less likely to scatter, they are widely used for windshields and side glasses of automobiles, window glass of buildings, and the like.

In recent years, such laminated glass has been required to have excellent sound insulation properties in order to improve the residential environment and the environment inside the vehicle.
The sound insulation of the laminated glass mainly depends on the viscoelasticity of the interlayer film. The viscoelasticity of the interlayer film is a characteristic property of a polymer that has both the elasticity to accumulate energy from the outside and the viscosity to release energy as heat. In other words, the air energy when the sound is transmitted to the outside is partially converted into thermal energy by the viscoelasticity of the intermediate film, and the sound transmitted to the inside is reduced, so that the sound insulation of the laminated glass is exhibited. . Therefore, the sound insulation performance of the intermediate film becomes better as the conversion efficiency of the air dense wave energy into heat energy increases.
The conversion efficiency of the air dense wave energy into heat energy can be expressed by a dynamic loss coefficient (tan δ value) by dynamic viscoelasticity measurement. Therefore, increasing the tan δ value near the room temperature of the interlayer film is an important measure for improving the sound insulation performance of the interlayer film, and further improving the laminated glass sound insulation performance.

As an intermediate film intended to improve sound insulation performance, for example, Patent Document 1 discloses a resin having a fluidity about three times higher than that of a normal intermediate film, for example, an intermediate film made of polyvinyl butyral. . However, the interlayer film disclosed in Patent Document 1 has a low sound insulation performance because there is a limit to the tan δ value of each resin.

Moreover, for example, Patent Document 2 discloses an intermediate film made of a structure in which two or more viscoelastic materials having different acoustic effects are bonded together. However, the interlayer film disclosed in Patent Document 2 has a problem in durability over a long period of time, such as a possibility that mass transfer may occur at the interface of the resin layer of the structural body and sound insulation may be reduced. There is also a problem that the adhesive strength at the interface is insufficient because of the dissimilar material.

Furthermore, in recent years, transparent glass plates sandwiching an interlayer film of laminated glass have been reviewed from the viewpoints of weight reduction and design novelty of automobiles, vehicles, etc. For example, it is considered to use a polycarbonate (PC) plate. Has been.
However, the conventional intermediate film developed with the aim of improving the sound insulation performance has insufficient adhesion to such a PC board, causing a crack phenomenon at the interface between the PC board and the intermediate film, and the appearance. There was a problem above.
Japanese Patent Publication No.46-5830 JP-A-62-37148

In view of the above situation, the present invention uses an interlayer film for a transparent laminate having excellent adhesion to a transparent glass plate and a transparent resin plate, and having excellent sound insulation performance near room temperature, and the interlayer film for the transparent laminate. An object of the present invention is to provide a transparent laminate.

The present invention is a resin having a sea component composed of an ethylene-vinyl acetate copolymer and a maximum value in which a loss tangent (tan δ value) measured by a dynamic viscoelasticity measuring device is 0.5 or more (hereinafter, excellent in sound insulation performance). And an island component composed of a mixture of oil components form a sea-island structure, and there is a maximum value at which the loss tangent (tan δ value) by the dynamic viscoelasticity measuring device is 0.5 or more. When the mixture of resin and oil is measured alone, the maximum value of loss tangent (tan δ value) by the dynamic viscoelasticity measuring device is in the temperature range of 0 to 50 ° C., and the intermediate film for transparent laminate is moved. 0 to indicate a mixture of a resin and an oil component having a maximum value at which the loss tangent (tan δ value) by the dynamic viscoelasticity measurement device is 0.5 or more when measured with a dynamic viscoelasticity measurement device under the condition of a frequency of 10 Hz In the temperature range of 40 ℃ Highest delivers the loss tangent (tan [delta value) is transparent multilayer-body intermediate layer is 0.2 or more.
The present invention is described in detail below.

As a result of intensive studies, the present inventors have found that an ethylene-vinyl acetate copolymer exhibiting excellent adhesion to a transparent resin plate such as a transparent glass plate and polycarbonate (PC), a resin and an oil component having excellent sound insulation performance. The intermediate film for transparent laminates having a phase-separated structure can be achieved with both excellent adhesion to transparent glass plates and transparent resin plates and excellent sound insulation performance near room temperature. The invention has been completed. In this specification, “near room temperature” refers to a temperature range of about 0 to 40 ° C. In addition, the “transparent laminate” means that the transparent laminate using the intermediate film for transparent laminate of the present invention can transmit external light. For example, a transparent laminate such as ground glass is not transparent. Including. For example, a material having a visible light transmittance of 5% or more is suitable.

The interlayer film for transparent laminate of the present invention has a phase composed of an ethylene-vinyl acetate copolymer.
The phase composed of the ethylene-vinyl acetate copolymer is a phase that imparts excellent adhesion to a transparent glass plate, a transparent resin plate, and the like to the intermediate film for a transparent laminate of the present invention.

The ethylene-vinyl acetate copolymer has a preferred lower limit of the content of vinyl acetate as a constituent component of 10% by weight and a preferred upper limit of 40% by weight. If it is less than 10% by weight, the resulting interlayer film for a transparent laminate of the present invention has sufficient tensile strength, but the transparency may be lowered. If it exceeds 40% by weight, the resulting transparent laminate of the present invention is obtained. Although the transparency of the body intermediate film is improved, mechanical strength such as tensile strength may be lowered.

The ethylene-vinyl acetate copolymer has a preferred lower limit of melt index (MI) of 1 g / 10 minutes and a preferred upper limit of 200 g / 10 minutes. If it is less than 1 g / 10 minutes, the fluidity of the resulting interlayer film for transparent laminate of the present invention may be lowered, and the combined workability (deaeration property, processing time) may be reduced, and it exceeds 200 g / 10 minutes. And when the viscosity of the interlayer film for transparent laminate of the present invention is reduced and the interlayer film for transparent laminate protrudes from the end or decreases in thickness after the combination processing, and when the transparent laminate is manufactured The impact resistance may be reduced.

The number average molecular weight of the ethylene-vinyl acetate copolymer is not particularly limited, but a preferable lower limit is 3000 and a preferable upper limit is 500,000. If it is less than 3000, the fluidity becomes excessively large, and if it exceeds 500,000, the fluidity is lowered, so that there may be a problem in the workability. A more preferred lower limit is 5000, a more preferred upper limit is 300,000, a still more preferred lower limit is 10,000, and a still more preferred upper limit is 250,000.

In addition, the ethylene-vinyl acetate copolymer may be a modified product subjected to modification such as plasticization, partial saponification, acid modification, and crosslinking as necessary.

It does not specifically limit as a manufacturing method of the said ethylene-vinyl acetate copolymer, For example, it can manufacture by well-known manufacturing methods, such as a high pressure method and an emulsification method.

The interlayer film for a transparent laminate of the present invention contains a phase composed of a resin excellent in sound insulation performance and a mixture of oils.
The phase composed of the above mixture is a phase that imparts excellent sound insulation performance to the interlayer film for a transparent laminate of the present invention, and this sound insulation performance is imparted by a resin that is excellent in the sound insulation performance.
Although this will be described later, in the interlayer film for a transparent laminate of the present invention, the phase composed of the ethylene-vinyl acetate copolymer and the phase composed of the mixture form a phase separation structure. This is because the loss tangent (tan δ value) of the excellent resin dynamic viscoelasticity measuring device is reflected in the loss tangent (tan δ value) of the dynamic laminate for the transparent laminate of the present invention. Conceivable. That is, as described above, the sound insulation performance of the interlayer film for transparent laminates becomes better as the tan δ value near room temperature becomes higher. Therefore, a resin having a high tan δ value is appropriately selected as the resin having excellent sound insulation performance. By doing so, the sound insulation performance of the interlayer film for a transparent laminate of the present invention can be made excellent.

The maximum value of the tan δ value of the resin having excellent sound insulation performance is generally indicated at a temperature higher than room temperature (for example, about 50 ° C.). However, in the interlayer film for a transparent laminate of the present invention, the resin excellent in sound insulation performance constitutes a mixture with an oil component described later, and the maximum temperature of the tan δ value of the mixture is excellent in the sound insulation performance. The resin is shifted to a lower temperature range than the maximum temperature of the tan δ value of the resin. Therefore, the tan δ value near room temperature of the above mixture is increased, and the interlayer film for transparent laminate of the present invention has excellent sound insulation performance near room temperature.
On the other hand, when only the resin excellent in the sound insulation performance is contained, sufficient sound insulation performance cannot be obtained at around room temperature. This is because, as described above, since the maximum value of the tan δ value of the resin having excellent sound insulation performance exists in the high temperature range, the tan δ value near room temperature becomes low.

The resin having excellent sound insulation performance has a maximum value at which the loss tangent tan δ value measured by the dynamic viscoelasticity measuring device is 0.5 or more. When the maximum value is less than 0.5, the sound insulation performance of the interlayer film for a transparent laminate of the present invention becomes insufficient. A preferred lower limit is 0.6.

Such a resin having excellent sound insulation performance is not particularly limited as long as it has the above tan δ value characteristics, but chlorine resin, acrylic resin, vinyl isoprene-styrene copolymer, pornolbornene, etc. are preferably used. It is done.

The chlorine-based resin is not particularly limited, and examples thereof include “Daiso Rack C130” manufactured by Daiso Corporation, “Elaslene 402NA” manufactured by Showa Denko Corporation, and the like.

The acrylic resin is not particularly limited, and examples thereof include “Parapet SA-F” manufactured by Kuraray Co., Ltd.

The vinyl isoprene-styrene copolymer is not particularly limited, and examples thereof include “Hibler 5127” manufactured by Kuraray Co., Ltd.

The polynorbornene is not particularly limited, and examples thereof include “Nosolex” manufactured by Arkema.

These resins having excellent sound insulation performance may be used alone or in combination of two or more. However, when using the above-mentioned chlorinated resins, other resins are used from the viewpoint of ease of disposal and recycling. It is preferable to use together. Among them, polynorbornene is suitable as the resin having excellent sound insulation performance because of its high tan δ value.

The polynorbornene is a polymer resin compound obtained by ring-opening polymerization of norbornene produced by Diels-Alder reaction of cyclopentadiene and ethylene, and having a structure in which double bonds and five-membered rings are alternately bonded. is there. Such polynorbornene has an extremely high oil absorbency, and has an advantage that the peak position and height of the tan δ value can be designed according to the oil absorption amount.

When the resin having excellent sound insulation performance is polynorbornene, the preferable lower limit of the number average molecular weight is 50,000, and the preferable upper limit is 6 million. When it is less than 50,000, the mechanical strength of the interlayer film for a transparent laminate of the present invention is lowered, and when it exceeds 6 million, the reaction efficiency during polymerization is lowered. A more preferable lower limit is 500,000, and a more preferable upper limit is 5 million. The above-mentioned “Nosolex” manufactured by Arkema is a high molecular weight polynorbornene having a number average molecular weight of about 3 million.

The said oil component comprises the phase which consists of the said mixture in the state included or absorbed in resin excellent in the sound insulation performance mentioned above. Such an oil component has an effect of increasing the maximum value of the tan δ value of the resin excellent in the sound insulation performance, and the maximum temperature of the tan δ value of the mixture is set to the tan δ value of the resin excellent in the sound insulation performance. This has the effect of shifting to a lower temperature range than the maximum temperature.
Specifically, in the interlayer film for a transparent laminate of the present invention, the maximum value of the loss tangent (tan δ value) of the mixture by the dynamic viscoelasticity measuring device is in the temperature range of 0 to 50 ° C. When the maximum value of the mixture is less than 0 ° C. or exceeds 50 ° C., the sound insulation performance is insufficient in a normal environment using the transparent laminate using the interlayer film for transparent laminate of the present invention. Become.

The oil component is not particularly limited as long as it is included or absorbed in the resin having excellent sound insulation performance under the normal use environment of the interlayer film for transparent laminate of the present invention and has the above-mentioned effects. Liquids such as fats and oils and mineral oils are preferably used.

The fats and oils are not particularly limited, and examples thereof include vegetable oils such as soybean oil, rapeseed oil, cottonseed oil, and rice oil, and animal oils such as pig oil, cow oil, fish oil, and butter. These may be used independently and 2 or more types may be used together.

It does not specifically limit as said mineral oil, For example, gasoline, kerosene, heavy oil, motor oil etc. are mentioned. These may be used independently and 2 or more types may be used together.
Moreover, as a commercial item of the said mineral oil, for example, Nisseki Hyzol SAS-LH, Nisseki Hyzol SAS-296, Aromi × 200P (all of these are manufactured by Shin Nippon Petrochemical Co., Ltd.), Sunthene 450 (manufactured by Sun Oil) And Diana Process Oil AH-58 (made by Idemitsu Kosan Co., Ltd.).

Furthermore, in the interlayer film for a transparent laminate of the present invention, by appropriately selecting the oil component, the transparency of the mixture with the resin having excellent sound insulation performance can be increased, and for the transparent laminate of the present invention. The interlayer film can be excellent in transparency.

As a blending amount of the oil, a preferable lower limit is 50 parts by weight and a preferable upper limit is 500 parts by weight with respect to 100 parts by weight of the resin having excellent sound insulation performance. If it is less than 50 parts by weight, the effect of shifting the maximum value of the tan δ value of the above mixture to a low temperature range can hardly be obtained, and the interlayer film for transparent laminate of the present invention is inferior in sound insulation performance near room temperature. There is. If it exceeds 500 parts by weight, the oil may bleed. A more preferred lower limit is 100 parts by weight, and a more preferred upper limit is 300 parts by weight.

In the intermediate film for transparent laminate of the present invention, the blending amount of the resin and oil component having excellent sound insulation performance is not particularly limited, but a preferred lower limit is 100 parts by weight of the ethylene-vinyl acetate copolymer. 5 parts by weight, and a preferred upper limit is 100 parts by weight. If it is less than 5 parts by weight, the sound insulation performance of the interlayer film for transparent laminate of the present invention may be insufficient. If it exceeds 100 parts by weight, the transparent glass plate of the interlayer film for transparent laminate of the present invention and Adhesive strength to the transparent resin plate may be reduced. A more preferred lower limit is 10 parts by weight, and a more preferred upper limit is 50 parts by weight.

In the interlayer film for transparent laminate of the present invention, the phase composed of the ethylene-vinyl acetate copolymer and the phase composed of the mixture form a phase separation structure. The phase separation structure is preferably a structure in which the phase composed of the mixture is finely dispersed in the phase composed of the ethylene-vinyl acetate copolymer. That is, the interlayer film for a transparent laminate of the present invention preferably has a so-called sea-island structure in which the phase composed of the ethylene-vinyl acetate copolymer is a sea component and the phase composed of the mixture is an island component.
When the interlayer film for a transparent laminate of the present invention has a sea-island structure, a transparent glass plate and / or a transparent resin plate that is an adherend of the interlayer film for the transparent laminate of the present invention is used as a transparent laminate. The interfacial characteristics are dominant in the phase composed of an ethylene-vinyl acetate copolymer, which is a sea component, and have excellent adhesiveness. On the other hand, the interlayer film for a transparent laminate of the present invention has a phase composed of a mixture containing a resin having excellent sound insulation performance as an island component, and therefore has excellent sound insulation performance. That is, according to the interlayer film for a transparent laminate of the present invention, both excellent adhesion to a transparent glass plate and / or transparent resin plate and excellent sound insulation performance can be achieved.

The interlayer film for a transparent laminate of the present invention in which a phase composed of such an ethylene-vinyl acetate copolymer and a phase composed of the above mixture form a phase separation structure is a loss tangent tan δ value measured by a dynamic viscoelasticity measuring device. The maximum value of the ethylene-vinyl acetate copolymer and the maximum value of the mixture appear. This indicates that the dynamic viscoelastic property behaves individually because the phase composed of the ethylene-vinyl acetate copolymer and the phase composed of the mixture form a phase separation structure.

Note that, as described above, the maximum value of the tan δ value of the mixture has the same maximum value of the tan δ value as that of the above-described resin having excellent sound insulation performance. This is a case where the maximum values of the tan δ values measured in (1) are compared. On the other hand, when the tan δ value of the interlayer film for transparent laminate of the present invention is measured, the maximum value of the tan δ value of the mixture actually measured is dispersed in the tan δ value of the ethylene-vinyl acetate copolymer, The value is smaller than the maximum value measured by the mixture alone.
When the tan δ value of the interlayer film for a transparent laminate of the present invention is measured with a dynamic viscoelasticity measuring device under the condition of a frequency of 10 Hz, the tan δ value indicated by the above mixture is the highest value in the temperature range of 0 to 40 ° C. The lower limit is preferably 0.2. If it is less than 0.2, the interlayer film for transparent laminate of the present invention is inferior in sound insulation performance.

Further, the interlayer film for transparent laminate of the present invention may be blended with known additives such as heat stabilizers, antioxidants, ultraviolet absorbers, etc., as necessary, within the range not impairing the effects of the present invention. Good.

The heat stabilizer is not particularly limited, and examples thereof include calcium stearate and dialkanol aliphatic tertiary amine.

The antioxidant is not particularly limited, and examples thereof include t-butylhydroxytoluene (BHT) and “Irganox 1010” manufactured by Ciba Geigy.

The ultraviolet absorber is not particularly limited, and examples thereof include benzotriazole-based and hindered amine-based ultraviolet absorbers. Examples of the benzotriazole series include “Tinuvin P”, “Tinuvin 320”, “Tinuvin 326”, “Tinuvin 328” and the like manufactured by Ciba Geigy, and examples of hindered amines include “LA -57 "and the like.

The thickness of the interlayer film for a transparent laminate of the present invention is appropriately determined depending on the use of the transparent laminate to be produced and is not particularly limited, but the preferred lower limit is 0.1 mm and the preferred upper limit is 1.5 mm. If it is less than 0.1 mm, the initial sound insulation effect may not be obtained, and if it exceeds 1.5 mm, it may be difficult to mold with a uniform thickness, and unevenness in sound insulation performance may occur. In addition, the manufacturing cost is disadvantageous.

The method for producing the interlayer film for a transparent laminate of the present invention is not particularly limited. For example, the above-described ethylene-vinyl acetate copolymer, a resin excellent in sound insulation performance, an oil component, and an additive that is added as necessary. A method of melt-kneading the mixed composition in an extruder and extruding the mixture composition into a sheet; a method of kneading the mixed composition with a mixing roller and forming a film with a hot press through a spacer having a predetermined thickness, etc. Can be mentioned.

A transparent laminate in which the interlayer film for a transparent laminate of the present invention is sandwiched between a pair of transparent glass plates and / or transparent resin plates is also one aspect of the present invention.
It does not specifically limit as said transparent glass plate, For example, transparent inorganic glass plates, such as float glass, are mentioned.
The transparent resin plate is not particularly limited, and examples thereof include transparent organic glass plates such as polycarbonate and methyl methacrylate.
The pair of transparent glass plates and / or transparent resin plates constituting the transparent laminate of the present invention may be the same type of combination or different types of combinations.

The method for producing the transparent laminate of the present invention is not particularly limited. For example, the intermediate laminate for the transparent laminate of the present invention is interposed between the pair of transparent glass plates and / or the transparent resin plate to obtain a sandwich body, This sandwich body is put in a rubber bag, deaerated for a certain time at a vacuum of about 20 Torr or less, then transferred to an oven at about 80 ° C. or more in a degassed state, and kept at this temperature for a certain time, whereby a transparent glass plate And / or a method of adhering the transparent resin plate and the interlayer film for transparent laminate of the present invention; sandwiching the interlayer film for transparent laminate of the present invention between the pair of transparent glass plates and / or transparent resin plates. The sandwich body is passed through a pressurized rubber roll at about 100 ° C. for a certain period of time, then transferred to an oven at about 80 ° C. or higher and held at this temperature for a certain period of time. The method adhering the transparent layered-body intermediate film of the transparent glass plate and / or a transparent resin plate and the invention, and the like.

The transparent laminate of the present invention is used for a multilayered transparent laminate by interposing a film or sheet such as polyester film, paper, metal sheet or the like printed with various patterns between the intermediate films for the transparent laminate of the present invention. An interlayer film or an interlayer film for a decorative transparent laminate may be used and laminated using the interlayer film.

According to the present invention, an intermediate film for a transparent laminate having excellent adhesion to a transparent glass plate and a transparent resin plate and having excellent sound insulation performance near room temperature, and a transparent laminate formed using the intermediate film for the transparent laminate Can provide the body.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

(Examples 1-6, Comparative Examples 1-4)
The mixed composition composed of the raw materials having the composition shown in Table 1 below is kneaded with a mixing roller, and pressurized and hot-pressed under conditions of a pressure of 10 MPa and a temperature of 180 ° C. using a spacer having a height of 0.4 mm to obtain a thickness. An interlayer film for a transparent laminate having a thickness of 0.4 mm was prepared.
In Table 1, the copolymer (A) is an ethylene-vinyl acetate copolymer (“EVAFLEX 360” manufactured by Mitsui DuPont Polychemical Co.), and the resin (B) is “Nosolex” manufactured by Arkema Co., Ltd. ) Represents “Nisseki Hysol SAS-LH” manufactured by Nippon Oil Corporation.

In addition, when the tan δ value of the resin (B) was measured under the condition of a frequency of 1000 Hz using a loss factor measuring device (RION sound and vibration signal analyzer SA-74, manufactured by Rion Co., Ltd.), the maximum value was 1.0. The temperature was 50 ° C.

The interlayer film for transparent laminate obtained in each of the examples and comparative examples was sandwiched between float glass plates (300 mm × 300 mm) having a thickness of 3 mm on the other side using a polycarbonate (PC) plate on one side. The sandwich body was put in a rubber bag, deaerated at a vacuum degree of 10 torr for 20 minutes, then transferred to an oven at 90 ° C. in a deaerated state, and kept at this temperature for 10 minutes, whereby the PC plate / interlayer film / glass was removed. A transparent laminate was produced by bonding.

(Evaluation)
The following evaluation was performed about the intermediate film for transparent laminated bodies and the transparent laminated body which were produced by the Example and the comparative example. The results are shown in Table 1.

(Tan δ value)
About the transparent laminated body produced by the Example and the comparative example, the tan-delta value in the frequency of 10 Hz was measured with the dynamic viscoelasticity spectrum measuring device (IT measurement control company make, product number: DVA200) (temperature rising 5 degree-C / min). The maximum value of the tan δ value of the copolymer (A), and the maximum value of the tan δ value of the mixture of the resin (B) and the oil component (C) (only the resin (B) is the same for Comparative Examples 2 and 3); And the maximum value of the tan-delta value in the temperature range of 0-40 degreeC of a mixture was measured, respectively.

(Sound insulation performance)
From the tan δ value in the temperature range of 0 to 40 ° C. of the mixture of the resin (B) and the oil component (C), the sound insulation performance was evaluated according to the following criteria.
○: Maximum value is 0.2 or more ×: Maximum value is less than 0.2

(Adhesiveness)
In the transparent laminates prepared in Examples and Comparative Examples, the adhesion between the transparent laminate intermediate film and the polycarbonate substrate was evaluated by the following method.
A polycarbonate substrate (PC) is used on one side, a polyester film is used on the other side, an intermediate film (immediately after production) is sandwiched between them, and a float glass plate (300 mm x 300 mm) that is a rigid body with a thickness of 3 mm is sandwiched between them. The sandwich is put in a rubber bag, deaerated at a vacuum of 10 torr for 20 minutes, then transferred to an oven at 90 ° C. in a deaerated state, and held at this temperature for 10 minutes, whereby the PC plate and the intermediate film are attached. The laminated body was manufactured by bonding.
This was cut into a width of 2 mm and a length of 100 mm to prepare a sample. The intermediate film at the end of this sample is peeled off, and the peeled off end of the intermediate film is pulled at 90 ° at a pulling speed of 500 mm / min using a tensile tester (Tensilon UCE500: manufactured by Orientec Co., Ltd.). The strength was measured. If the peel strength is 3.0 kg / cm or more, the adhesive strength between the intermediate film and the PC is considered to be sufficient.

(Comprehensive judgment)
The performance as a transparent laminate of the interlayer film for a transparent laminate produced in Examples and Comparative Examples was determined according to the following criteria.
○: Excellent adhesiveness and sound insulation performance, and sufficient performance as an interlayer film for transparent laminates ×: Inferior to adhesiveness and / or sound insulation performance, insufficient performance as an interlayer film for transparent laminates

ADVANTAGE OF THE INVENTION According to this invention, while being excellent in the adhesiveness with respect to a transparent glass plate and a transparent resin plate, the transparent film which uses the intermediate film for transparent laminated bodies which has the outstanding sound-insulation performance at normal temperature vicinity, and this intermediate film for transparent laminated bodies A laminate can be provided.

Claims (3)

A sea component composed of an ethylene-vinyl acetate copolymer and an island component composed of a mixture of a resin and an oil component having a local maximum value with a loss tangent (tan δ value) of 0.5 or more determined by a dynamic viscoelasticity measuring device, Forming a sea-island structure, and
Loss tangent (tan δ value) by dynamic viscoelasticity measurement device when a mixture of resin and oil having a maximum value at which the loss tangent (tan δ value) by the dynamic viscoelasticity measurement device is 0.5 or more is measured alone ) In the temperature range of 0 to 50 ° C., and the loss caused by the dynamic viscoelasticity measuring device when the transparent laminate intermediate film is measured with a dynamic viscoelasticity measuring device at a frequency of 10 Hz. The maximum value of the loss tangent (tan δ value) in the temperature range of 0 to 40 ° C. indicated by the resin and oil mixture in which the tangent (tan δ value) has a maximum value of 0.5 or more is 0.2 or more. An intermediate film for a transparent laminate. 2. The resin having a maximum value at which a loss tangent (tan δ value) measured by a dynamic viscoelasticity measuring device is 0.5 or more in a temperature range of 0 to 50 ° C. is polynorbornene. Intermediate film for transparent laminate. A transparent laminate, wherein the interlayer film for a transparent laminate according to claim 1 or 2 is sandwiched between a pair of transparent glass plates and / or transparent resin plates.