KR101532340B1 - Film for laminated glass - Google Patents

Abstract

The present invention relates to an intermediate region comprising two or more resin layers; And an outer region adjacent to both sides of the intermediate region and formed integrally with the intermediate region, wherein the intermediate region comprises a greater number of resin layers than the outer region, When the film is used as a laminated glass film, it can be used as a bonding film for a laminated glass used for automobiles, buildings and the like because it can exhibit excellent sound insulation, ductility and impact resistance.

Description

FILM FOR LAMINATED GLASS [0002]

TECHNICAL FIELD The present invention relates to a film useful as a bonding film for laminated glass used for automobiles, buildings, and the like.

Lipped glass is a glass having a resin layer made of a film or the like interposed between two or more glasses. The glass has an excellent impact resistance and is advantageous in that scattering of glass fragments can be prevented at the time of breakage.

Japanese Laid-Open Patent Application No. 2007-331964 (Application 2006-164071) discloses an intermediate film (film) for laminating glass and a laminated glass using the same, wherein the intermediate film is made of a sound insulating layer containing polyvinyl butyral and a plasticizer Wherein the sound insulating layer and the polyvinyl butyral have a degree of butylation higher than that of the protective layer. The intermediate film for a laminated glass has almost no whitening phenomenon even when wetted with water and has excellent soundproofness And the like.

However, the conventional films including the above-mentioned intermediate film are thinned in the edge direction of the film outer region when the film is stretched to produce a car windshield, and the sound insulating performance is lost as a whole, And the like. In addition, since it is in the form of a multi-layered structure, it is not possible to reuse the remainder of the end portion or the broken film as a recycle chip, which is disadvantageous from the viewpoint of cost reduction.

Accordingly, it is required to develop a new polyvinyl acetal film which can improve the sound insulation function and impact resistance in the entire width direction, while reducing manufacturing cost through recyclability.

Japanese Patent Application Laid-Open No. 2007-331964

Accordingly, an object of the present invention is to provide a film for laminated glass excellent in sound insulation, ductility and impact resistance even in various external environments.

According to the above object, the present invention provides a semiconductor device comprising: an intermediate region comprising two or more resin layers; And an outer region adjacent to both sides of the two or more resin layers included in the intermediate region and formed integrally with the intermediate region, wherein the intermediate region includes a greater number of resin layers than the outer region Film.

The present invention also provides a protective layer comprising: a first protective layer; A first sound insulating layer disposed on the first protective layer; A second protective layer disposed on the first sound insulating layer; And a second sound insulating layer disposed adjacent to one side of the first protective layer, one side of the first sound insulating layer and one side of the second protective layer.

In addition, the present invention provides a glass plate comprising: a first glass plate; A second glass plate facing the first glass plate; And an interlayer interposed between the first glass plate and the second glass plate, wherein the interlayer comprises an intermediate region comprising two or more resin layers; And an outer region adjacent to both sides of the two or more resin layers included in the intermediate region and formed integrally with the intermediate region, wherein the intermediate region includes a greater number of resin layers than the outer region And provides a laminated glass.

The film of the present invention can exhibit excellent car noise, ductility, impact resistance and the like, and thus can be usefully used as a bonding film for laminated glass used for automobiles, buildings, and the like.

1 is a plan view showing a sound insulating film according to an embodiment.
2 is a cross-sectional view showing a section taken along the line A-A 'in FIG.
3 is a view illustrating a process of manufacturing a sound insulation film according to an embodiment.
4 is a view showing a part of a T-die.
5 is a cross-sectional view showing one end surface of the laminated glass according to the embodiment.

The film of the present invention comprises an intermediate region comprising two or more resin layers; And an outer region adjacent to both sides of the two or more resin layers included in the intermediate region and formed integrally with the intermediate region.

The intermediate region may be a multi-layer structure including a greater number of resin layers than the outer region. The intermediate region may have 3 to 500 layers, 3 to 200 layers, 3 to 100 layers, 3 to 50 layers, or 3 to 20 layers, preferably 3 to 10 layers, more preferably 3 layers, To 5 layers.

If the number of the laminated layers in the intermediate region exceeds 500, the thickness of the individual layers becomes too thin, so that the laminated structure may be broken at the time of forming the film and the endurance of the inner layer may be deteriorated.

The outer region may include one resin layer and may have a single layer structure.

The resin layers included in the intermediate region and the resin layer included in the outer region may include a polyvinyl acetal resin, and the polyvinyl acetal resin may preferably be polyvinyl butyral.

The degree of polymerization of the polyvinyl acetal resin may be 1,000 to 3,000, and preferably 1,500 to 2,500.

When the degree of polymerization is less than 1,000, the molecular weight is low and good penetration resistance can not be exhibited. When the degree of polymerization is more than 3,000, the viscosity becomes too high. When the laminated glass is produced using the film of the present invention, There is a problem that optical distortion is hindered.

The polyvinyl acetal resin may have an acetate content of 5 mol% or more, and preferably 10 to 50 mol%. When the content of the acetate is less than 5 mol%, the amount of the hydroxyl group in the polyvinyl acetal resin increases, and the compatibility with the plasticizer is lowered, so that migration of the plasticizer may occur, thereby deteriorating the sound insulating performance and water resistance .

In addition, the polyvinyl acetal resin may comprise 20 to 50% plasticizer, preferably 25 to 35% plasticizer. When the content of the plasticizer is less than 20%, the elastic region of the polyvinyl acetal resin becomes excessively high, thereby deteriorating the sound insulating performance. When the plasticizer content exceeds 50%, the viscous region is excessively increased, The strength and toughness of the steel sheet deteriorate.

The plasticizer may be a glycol plasticizer, for example, triethylene glycol bis 2-ethylhexanoate (3G8), tetraethylene glycol diheptanoate (4G7), triethylene glycol bis 2-ethylbutyrate (3GH) And glycol bis 2-heptanoate (3G7). However, adipate plasticizers, especially dibutoxyethoxyethyl adipate (DBEA), dibutyl sebacate (DBS), or bis-2-hexyl adipate (DHA) It is not suitable because it lowers the water resistance.

Wherein the intermediate region comprises a first resin layer; A second resin layer disposed on the first resin layer; And a third resin layer disposed on the second resin layer, wherein the concentration of the plasticizer contained in the second resin layer is higher than the concentration of the plasticizer contained in the first resin layer and the third resin layer .

The outer region may include a fourth resin layer disposed adjacent to both the side surfaces of the first resin layer, the side surfaces of the second resin layer, and the side surfaces of the third resin layer, The concentration of the plasticizer may be higher than the concentration of the plasticizer contained in the first resin layer and the third resin layer.

On the other hand, at least one of the resin layers included in the intermediate region and the resin layer contained in the outer region contain an additive selected from an antioxidant, a UV stabilizer, a UV absorber, a glass adhesion modifier, and mixtures thereof .

As the antioxidant, Irganox, butylhydroxytoluene (BHT) and the like of BASF may be used; As the UV stabilizer, Tinuvin of BASF may be used; As the UV absorber, Chemisorb 12, Chemersorb 79, Chemersorb 74, Chemersorb 102, Tinuvin 328 of BASF, Tinuvin 329, Tinuvin 326 and the like can be used as the UV absorber; As the glass adhesion modifier, Mg, K, Na, epoxy-modified Si oil, or a mixture thereof may be used.

Such an additive may be contained in an amount of 0.01 to 1.0% by weight, preferably 0.2 to 0.5% by weight, based on the weight of the resin layer. When the additive is included in the above range, thermal stability, light resistance, and glass bonding strength can be increased.

The uppermost surface of the intermediate region and the uppermost surface of the outer region may be disposed on the same plane, and the lowermost portion of the intermediate region and the lowermost portion of the outer region may be disposed on the same plane.

Wherein the outer region includes a first outer region disposed adjacent to one side of two or more resin layers included in the intermediate region; And a second outer region disposed adjacent to both of the other sides of the two or more resin layers included in the intermediate region, the intermediate region being disposed between the first outer region and the second outer region .

The intermediate region and the outer region may have a shape extending in one direction, and the width of the outer region may be 2.5 to 25%, preferably 5 to 20%, more preferably 5 to 20% May be between 10 and 20%.

When the outer area is at least 25% of the width of the intermediate area, the area of the outer area, which is a single layer structure, is widened. As a result, the mechanical properties of the entire film are deteriorated and the penetration performance can not be satisfied. The sound insulation performance is deteriorated rather than 40 degrees, which is not preferable. In addition, there is a problem that the tendency of sticking of the film becomes large, so that the workability is poor, and the degassing performance is impaired and bubbles are generated in the glass.

On the other hand, when the outer region is less than 2.5% based on the width of the middle region, the outer region of the film is thinned during the stretching process of the film. Therefore, when the film of the present invention is used for manufacturing a windshield of an automobile, The performance and penetration performance are deteriorated. In addition, since the end portion of the film is cut to include the intermediate region portion having a multilayer structure in the remaining portion, it is difficult to reuse the film as a recycle chip.

The total thickness of the film may be from 0.1 to 5.0 mm, preferably from 0.2 to 2.0 mm. In the above range, there is an advantage in that the impact resistance and the ductility are excellent.

The film of the present invention may have a surface roughness Rz of both sides of 20 mu m or more, and preferably 20 to 70 mu m. When the surface roughness is in the above range, blocking of the film during the process can be minimized, and when the film is used in the glass bonding process, deairing is more effectively performed at the time of glass bonding. .

The film of the present invention may be obtained by (a) melt-extruding a resin layer (fourth resin layer) having a single-layer structure; (b) melt-extruding a multilayer resin layer in the order of the first resin layer, the second resin layer, and the third resin layer; (c) a feed block flow path is designed so that the fourth resin layer, which is a single layer structure, is an outer region of the film, and the first resin layer, the second resin layer, and the third resin layer, And then extruding the mixture into a single / multi-layer composite structure from a die to obtain a film.

In addition, (c), a surface patterning process may be performed on both sides of the film to increase the surface roughness Rz of both surfaces. Such a surface patterning process may include, for example, a desired surface roughness (for example, Rz 20 m Or more) by using a mat roll surface-treated, and in this case, anti-blocking property and degassing property can be improved.

The film may preferably be used as a sound insulating film.

Wherein the sound insulating film comprises: a first protective layer; A first sound insulating layer disposed on the first protective layer; A second protective layer disposed on the first sound insulating layer; And a second sound insulating layer disposed adjacent to one side of the first protective layer, one side of the first sound insulating layer, and one side of the second protective layer.

The sound insulating film may include a third sound insulating layer disposed adjacent to the other side of the first protective layer, the other side of the first sound insulating layer, and the other side of the second protective layer.

That is, the first resin layer, the second resin layer, and the third resin layer correspond to the first protective layer, the first sound insulating layer, and the second protective layer, and the fourth resin layer corresponds to the second sound insulating layer And the third sound insulating layer.

Wherein the first protective layer, the second protective layer, the first sound-insulating layer and the second sound-insulating layer comprise a polyvinyl butyral resin, and the concentration of the plasticizer contained in the first sound- And the concentration of the plasticizer contained in the second sound insulating layer may be higher than the concentration of the plasticizer contained in the first protective layer and the second protective layer .

The sound insulating film is excellent in sound insulating performance by reducing the coincidence effect in which the sound insulating performance is lowered in the high frequency region, especially in the vicinity of 2,000 to 4,000 Hz. And the effect of improving the sound insulation performance (the loss coefficient is increased) in all the low temperature region and the high temperature region can be exerted.

Therefore, when the sound insulating film of the present invention is used for manufacturing a windshield for automobile, the sound insulating performance and the penetration performance of the outer region that is thinned during the film stretching process can be improved.

The sound insulating film may be interposed between two or more glass plates and used to produce a laminated glass.

The laminated glass may have a laminated structure of a glass plate, a sound insulating film and a glass plate, and the thickness of the glass plate may be 0.5 to 10 T, preferably 1 to 5 T.

For example, the laminated glass includes a first glass plate; A second glass plate facing the first glass plate; And an interlayer interposed between the first glass plate and the second glass plate, wherein the interlayer comprises an intermediate region comprising two or more resin layers; And an outer region adjacent to both of the side faces of the two or more resin layers included in the intermediate region and formed integrally with the intermediate region, wherein the intermediate region includes a greater number of resin layers than the outer region .

The above-mentioned lumber glass is manufactured by preparing a 2.1 T glass-sound-attenuating film-2.1 T glass laminate according to KS L 2007, and dropping a 2.26 kg steel ball, And can have an in-pipe strength of more than 4 m in height. There is an advantage in terms of impact absorption, glass protection, and safety when exhibiting the endurance of the above range.

Also, when a 1.20 kg steel ball was dropped on a 4 T glass-sound-shielding film-4 T glass laminate according to the procedure of the impact test of the laminated glass according to KS L 2004, the impacted laminate was broken, It has advantages of glass scattering prevention, shock absorption, and safety.

Also, as a pummel bonding strength evaluation, when a 2.1 T glass-sound insulating film-2.1 T glass laminate was prepared, and the amount of the glass remaining on the film after confirming that the glass was cooled to -18 캜, The amount of the glass having a glass transition point of 30 to 90%, preferably 30 to 90%. If it is less than 30%, the bonding force between the glass and the film is poor, and if it is more than 90%, the bonding force is too high and the film may be torn.

In addition, as an optical distortion evaluation, a 2.1 T glass-sound-attenuating film-2.1 T glass laminate was prepared, preliminarily bonded to a vacuum, degassed and edge sealed, and then subjected to heat treatment in an autoclave at 140 캜 After 2 hours of bonding, the optical performance is excellent because there is no bending or wrinkling on the projected image when the 30 degree angle is tilted in the dark room and then the highlight is irradiated.

Further, as a whiteness distance evaluation, the whitening distance measured from the edge portion of the laminate after immersing the 2.1 T glass-sound insulating film -2.1 T glass laminate in water at 100 ° C for 6 hours may be less than 7 mm. Within the above range, water resistance is excellent and long-term durability is excellent.

As described above, the film of the present invention can exhibit excellent performance when it is used as a sound-insulating film used in manufacturing a laminated glass, particularly a sound-insulating film of laminated glass used for automobiles or buildings.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a preferred sound insulating film and a laminated glass using the same according to the present invention will be described in detail with reference to the drawings.

1 is a plan view showing a sound insulating film according to an embodiment of the present invention.

Referring to FIG. 1, a sound insulating film 10 according to an embodiment of the present invention includes an intermediate area CA, a first outer area OA1, and a second outer area OA2.

Fig. 2 is a cross-sectional view taken along line A-A 'in Fig.

Referring to FIG. 2, the middle area CA includes more resin layers than the first outer area OA1 and the second outer area OA2.

2, the intermediate region CA includes a first sound insulating layer 130, a first protective layer 110 disposed on one surface of the first sound insulating layer 130, and a first sound insulating layer 130 The first outer area OA1 and the second outer area OA2 may have a three-layer structure composed of the second sound insulation layer 140 and the second protective layer 120 disposed on the other surface of the second sound insulation layer 130, And a third sound-insulating layer 150.

FIG. 3 shows a process of manufacturing a sound insulation film according to an embodiment of the present invention. FIG. 4 shows a structure of a T-die 40 used for manufacturing a sound insulation film according to an embodiment of the present invention. have.

3, the sound insulating film according to an embodiment of the present invention discharges resin to the casting roll 50 through the T-die 40, and then cooling the resin coated on the casting roll 50, The film 10 is formed and the sound insulating film 10 is moved by the guide rolls 60 and wound up by a winding roll 70. [

4, the resin is discharged in three layers in the intermediate flow path 41, and the resin is discharged in a single layer in the first outer flow path 42 and the second outer flow path 43. In the jetting section 44, the resin discharged through the intermediate flow path 41, the first outer flow path 42 and the second outer flow path 43 is joined. At this time, the jetting section 44 is provided on the casting roll 50 (50) while maintaining the shape of the resin discharged from the intermediate flow path 41 and the shape of the resin discharged from the first outer flow path 42 and the second outer flow path 43 ).

5 is a cross-sectional view of a laminated glass according to an embodiment of the present invention.

Referring to FIG. 5, a laminated glass according to an embodiment of the present invention includes a first glass plate 20; A second glass plate (30) facing the first glass plate (20); And an intermediate film (sound insulating film) 10 interposed between the first glass plate 20 and the second glass plate 30. The intermediate film (sound insulating film) 10 includes a first sound insulating layer 130, An intermediate region including two or more resin layers composed of a first passivation layer 110 disposed on one side of the layer 130 and a second passivation layer 120 disposed on the other side of the first sound insulating layer 130; And an outer region which is adjacent to both sides of two or more resin layers included in the intermediate region and which is a second sound insulating layer 140 and a third sound insulating layer 150 integrally formed with the middle region. As can be seen from FIG. 5, the intermediate region includes a greater number of resin layers than the outer peripheral region.

Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are illustrative of the present invention, and the present invention is not limited to the following examples.

The ingredients used in the following examples and comparative examples are as follows:

- Polyvinyl butyral resin (protective layer resin): Acetate content 1 mol%, degree of polymerization 1700, Wanwei Co., China

Polyvinyl butyral resin (sound insulation layer resin 1): Acetate content 8 mol%, degree of polymerization 1700, Xinfu Co., Ltd., China

 Polyvinyl butyral resin (sound insulating layer resin 2): acetate content 12 mol%, degree of polymerization 2400, Xinfu Co., Ltd., China

Polyvinyl butyral resin (sound insulation layer resin 3): Acetate content 8 mol%, degree of polymerization 4000, Xinfu Co., Ltd., China

Polyvinyl butyral resin (sound insulating layer resin 4): Acetate content 3 mol%, degree of polymerization 500, Xinfu Co., Ltd., China

- triethylene glycol bis 2-ethylene hexanoate: purity not less than 97.0%, WVC3800, Celanese, Germany

- Chemisorb 12: Benzophenone series, chemoproduct, Japan

- Camerosov 79: benzotriazole series, chemoproduct, Japan

- Irganox: hindered phenolic, BASF, Germany

- butylhydroxytoluene (BHT): Lanxess, Vulkanox, Germany

- Mg, K, and Na: Mg ethyl butyrate, K acetate, Na acetate, OCI, Korea

- Epoxy-modified Si oil: KCC Silicone Co., Korea

Example 1

To prepare the composition for the protective layer to be contained in the multilayer structure, 71.78 wt% of a polyvinyl butyral (PVB) resin based on 100 wt% of the composition, 28 wt% of triethylene glycol bis 2-ethylene hexanoate as a plasticizer, 0.1% by weight of Sorb 79, 0.1% by weight of Irganox as an antioxidant, and 0.02% by weight of Mg + K as a glass adhesion modifier.

In order to prepare a composition for a sound insulation layer to be contained in a single layer and a multilayer structure, 64.7% by weight of a polyvinyl butyral (PVB) resin based on 100% by weight of the composition, 35% by weight of triethylene glycol bis 2-ethylene hexanoate as a plasticizer, 0.2% by weight of Camerosorb 79, 0.1% by weight of Irganox as an antioxidant, and 0.005% by weight of Mg + K + Na as a glass adhesion modifier.

The protective layer composition and the sound insulation layer composition were melt-extruded through respective extruders at a melting temperature of 190 DEG C and 170 DEG C, respectively, and a feed block device designed so that the area of the single layer was 30% A single layer of silver, the intermediate region of the film being a multilayer structure, and cooled on a 40 占 폚 casting roll.

The single / multilayer film including the monolayer structure cooled in the casting roll and the multilayer structure was heated and pressed at a temperature of 100 DEG C in a mat roll having Rz 30 mu m roughness to obtain a film having a surface roughness Rz of 40 mu m and a total thickness of 0.76 mm .

Example 2, and Comparative Examples 1 and 2

The same procedures as in Example 1 were carried out except that the composition shown in Table 1 below was used as the protective layer composition and the sound insulating layer composition and the single / .

At this time, Comparative Example 1 was composed of a single layer structure and Comparative Example 2 was composed of a multilayer structure.

Test Example

The properties of the films prepared in the Examples and Comparative Examples were evaluated as follows, and the results are shown in Table 1 below.

<Loss coefficient>

A specimen was prepared by bonding a 2.1 T glass-film-2.1 T glass of 300 mm x 25 mm in a laminator at 130 &lt; 0 &gt; C for 15 minutes through heating and pressing. The prepared specimens were aged in a constant temperature chamber at 10 ° C, 20 ° C, and 40 ° C for 1 hour, and the specimens were excited by a vibration generator for damping test. The resulting vibration characteristics were amplified by a mechanical impedance amplifier, The loss factor of the graph obtained by analyzing by the FFT spectrum analyzer was calculated using the 1 dB method at a frequency of about 2000 to 4000 Hz. The higher the loss factor, the better the sound insulation performance.

<Drop height>

The penetration resistance of glass with polyvinyl acetal film bonded according to KS L 2007 was evaluated. Specifically, a specimen was bonded by heating and pressing a 300 mm × 300 mm 2.1 T glass-film-2.1 T glass in a laminator at a temperature of 130 ° C. for 15 minutes. Then, a 2.26 kg steel ball was dropped on the specimen, The height (MBH) at which the test piece penetrated was measured.

<Impact test>

Based on KS L 2004, the presence or absence of the glass with the polyvinyl acetal film bonded thereto was evaluated. Specifically, 4T glass-film-4T glass having a size of 610 mm × 610 mm was bonded to a laminator at a temperature of 130 ° C. for 15 minutes by heating and pressing, and then a specimen was prepared. , And the impacted specimen was broken to confirm whether the glass was scattered or opened, that is, the glass was missing.

<Evaluation of Pummer Joint Force>

The bond strength between polyvinyl acetal film and glass was evaluated by evaluating the pummel bonding strength. Specifically, a specimen was prepared by joining a 300 mm × 300 mm 2.1 T glass-film-2.1 T glass through a laminator at a temperature of 130 ° C. for 15 minutes through heating and pressing. The specimen was cooled to -18 ° C., After measuring the degree of the amount of the remaining glass on the film, the case in which no glass remains in the film is set to 0, the case in which all the glass remains in the film is set to 10, .

&Lt; Evaluation of optical distortion &

2.1 T glass-film-2.1 T glass laminate was preliminarily bonded by vacuum, degassed and edge sealed, and then bonded in an autoclave at 140 ° C for 2 hours. Then, in a dark room, When a 30-degree angle was tilted and the hillight was examined, it was confirmed whether or not there was distortion or wrinkle by checking whether or not there was any distortion in the projected image.

&Lt; Evaluation of water resistance (comparison before and after immersion in water) >

A 300 mm × 300 mm 2.1 T glass-film-2.1 T glass was bonded in a laminator at a temperature of 130 ° C. for 15 minutes by heating and pressing, and then the specimen was boiled in water at 100 ° C. for 6 hours, And the distance of water infiltration in the corner direction was measured.

The numbers in parentheses in Table 1 are weight percent of each component.

As can be seen from the above Table 1, the films of Examples 1 and 2 according to the present invention exhibited superior performance to polyvinyl acetal films of Comparative Examples 1 and 2 in terms of sound insulation and penetration resistance.

CA: Middle area OA1: First outer area
OA2: second outer region 10: sound insulating film, intermediate film
20: first glass plate 30: second glass plate
40: T die 41: Middle flow path
42: first outer flow path 43: second outer flow path
44: jetting section 50: casting roll
60: guide roll 70: winding roll
110: first protective layer 120: second protective layer
130: first sound insulating layer 140: second sound insulating layer
150: Third sound insulation layer

Claims (12)

An intermediate region comprising two or more resin layers; And
A film including an outer region formed integrally with the intermediate region and adjacent to both sides of two or more resin layers included in the intermediate region,
Wherein the outer region includes one resin layer,
The resin layers included in the intermediate region and the resin layer included in the outer region include a polyvinyl butyral resin,
The intermediate region
A first resin layer;
A second resin layer disposed on the first resin layer; And
And a third resin layer disposed on the second resin layer,
The concentration of the plasticizer contained in the second resin layer is higher than the concentration of the plasticizer contained in the first resin layer and the third resin layer,
The outer region
And a fourth resin layer disposed adjacent to both the side surfaces of the first resin layer, the side surfaces of the second resin layer and the side surfaces of the third resin layer,
Wherein the concentration of the plasticizer contained in the fourth resin layer is higher than the concentration of the plasticizer contained in the first resin layer and the third resin layer.
delete delete delete delete The method according to claim 1,
The uppermost surface of the intermediate region and the uppermost surface of the outer peripheral region are arranged on the same plane,
Wherein the bottom face of the intermediate region and the bottom face of the outer region are disposed on the same plane.
The method according to claim 1,
The outer region
A first outer region disposed adjacent to one side of the two or more resin layers included in the intermediate region; And
And a second outer region adjacent to both of the other sides of the two or more resin layers included in the intermediate region,
Wherein the intermediate region is disposed between the first outer region and the second outer region.
The method according to claim 1,
Wherein the intermediate region and the outer region have a shape extending in one direction,
Wherein the width of the outer region is 2.5% to 25% based on the width of the middle region.
A first protective layer;
A first sound insulating layer disposed on the first protective layer;
A second protective layer disposed on the first sound insulating layer; And
And a second sound insulating layer disposed adjacent to one side of the first protective layer, one side of the first sound insulating layer and one side of the second protective layer,
Wherein the first protective layer, the second protective layer, the first sound insulating layer and the second sound insulating layer are resin layers, wherein the second sound insulating layer comprises one resin layer,
Wherein the first protective layer, the second protective layer, the first sound insulating layer and the second sound insulating layer comprise a polyvinyl butyral resin,
Wherein the concentration of the plasticizer contained in the first sound insulating layer is higher than the concentration of the plasticizer contained in the first and second protective layers,
Wherein the concentration of the plasticizer contained in the second sound insulating layer is higher than the concentration of the plasticizer contained in the first protective layer and the second protective layer.
10. The method of claim 9,
And a third sound insulating layer disposed adjacent to the other side of the first protective layer, the other side of the first sound insulating layer, and the other side of the second protective layer.
delete A first glass plate;
A second glass plate facing the first glass plate; And
And an interlayer interposed between the first glass plate and the second glass plate,
The interlayer
An intermediate region comprising two or more resin layers; And
And an outer region which is formed integrally with the intermediate region and which is adjacent to both sides of two or more resin layers included in the intermediate region,
Wherein the outer region includes one resin layer,
The resin layers included in the intermediate region and the resin layer included in the outer region include a polyvinyl butyral resin,
The intermediate region
A first resin layer;
A second resin layer disposed on the first resin layer; And
And a third resin layer disposed on the second resin layer,
The concentration of the plasticizer contained in the second resin layer is higher than the concentration of the plasticizer contained in the first resin layer and the third resin layer,
The outer region
And a fourth resin layer disposed adjacent to both the side surfaces of the first resin layer, the side surfaces of the second resin layer and the side surfaces of the third resin layer,
Wherein the concentration of the plasticizer contained in the fourth resin layer is higher than the concentration of the plasticizer contained in the first resin layer and the third resin layer.

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