WO2017039004A1 - Interlayer film for laminated glass, and laminated glass - Google Patents

Abstract

Provided is an interlayer film for laminated glass with which it is possible to easily recognize the display correspondence region of the interlayer film corresponding to the display region of a head-up display when obtaining laminated glass, more accurately position the display correspondence region of the interlayer film on the display region of a head-up display in laminated glass, and display information well in a head-up display. The interlayer film for laminated glass according to the present invention includes a thermoplastic resin, has one end and another end thicker than the one end on the side opposite the one end, has a display correspondence region corresponding to the display region of a head-up display, and makes it possible to visually distinguish the display correspondence region from the surrounding region adjacent to the display correspondence region, or the color or glossiness of the display correspondence region differs from the color or glossiness of the surrounding region adjacent to the display correspondence region.

Description

Laminated glass interlayer film and laminated glass

The present invention relates to an interlayer film for laminated glass used for obtaining laminated glass. Moreover, this invention relates to the laminated glass using the said intermediate film for laminated glasses.

Laminated glass is superior in safety even if it is damaged by an external impact and the amount of glass fragments scattered is small. For this reason, the said laminated glass is widely used for a motor vehicle, a rail vehicle, an aircraft, a ship, a building, etc. The laminated glass is manufactured by sandwiching an interlayer film for laminated glass between a pair of glass plates.

A head-up display (HUD) is known as the laminated glass used in automobiles. In HUD, measurement information such as speed, which is driving data of a car, can be displayed on the windshield of the car.

The above HUD has a problem that the measurement information displayed on the windshield looks double.

In order to suppress double images, the following Patent Document 1 discloses a laminated glass in which a wedge-shaped interlayer film having a predetermined wedge angle is sandwiched between a pair of glass plates. In such a laminated glass, by adjusting the wedge angle of the interlayer film, the display of measurement information reflected by one glass plate and the display of measurement information reflected by another glass plate can be performed in the driver's field of view. Can be tied to one point. For this reason, it is hard to see the display of measurement information double, and it is hard to disturb a driver | operator's visual field.

Japanese National Publication No. 4-502525

In the wedge-shaped intermediate film, the intermediate film itself has a region where measurement information can be displayed favorably on the HUD and another region where measurement information cannot be favorably displayed on the HUD due to the wedge angle or the like. Sometimes. The area where the measurement information of the intermediate film can be displayed is a display corresponding area corresponding to the display area of the HUD.

For example, HUDs such as windshields often display information at the bottom. In addition, the display area of the HUD is often determined depending on the vehicle type and the mounting location.

Also, the glass plate before the intermediate film is sandwiched has a predetermined size depending on the vehicle type and the mounting location. For this reason, the glass plate has a display corresponding area of HUD in a predetermined area. In the glass plate before the intermediate film is sandwiched, the portion located in the display area of the HUD is determined, and the display corresponding area of the glass plate is often determined.

In the conventional wedge-shaped intermediate film, it may be difficult to match the display corresponding area of the intermediate film and the display corresponding area of the glass plate at the time of producing the laminated glass. Sometimes. Further, the display corresponding area of the intermediate film is not located in the display area of the HUD that is the obtained laminated glass, and the other area of the intermediate film that cannot display the measurement information in the HUD is the display area of the HUD. May be located.

As a result, in the display area of the HUD that is the obtained laminated glass, the measurement information looks double, or the measurement information itself is not displayed in a readable manner.

On the other hand, for example, while measuring and confirming the wedge angle, it is possible to grasp the position of the display corresponding region of the interlayer film and to produce the laminated glass. However, the production efficiency of laminated glass is greatly reduced.

The object of the present invention is to easily recognize the display corresponding area of the intermediate film corresponding to the display area of the head-up display when obtaining the laminated glass, and to display the intermediate film in the display area of the head-up display of the laminated glass. It is to provide an interlayer film for laminated glass capable of positioning a region more reliably and displaying information on a head-up display. Another object of the present invention is to provide a laminated glass using the interlayer film for laminated glass.

According to a wide aspect of the present invention, there is provided an interlayer film for laminated glass used for laminated glass that is a head-up display, including a thermoplastic resin, and having a thickness larger than the one end and one end opposite to the one end. The display corresponding region corresponding to the display region of the head-up display, and the display corresponding region and the surrounding region adjacent to the display corresponding region can be visually identified. Alternatively, an interlayer film for laminated glass is provided in which the color or glossiness of the display corresponding area is different from the color or glossiness of the surrounding area adjacent to the display corresponding area.

In one specific aspect of the interlayer film for laminated glass according to the present invention, the color or glossiness of the display corresponding region is different from the color or glossiness of a surrounding region adjacent to the display corresponding region, and in another specific aspect, The color of the display corresponding area is different from the color of the area adjacent to the display corresponding area.

In a specific aspect of the interlayer film for laminated glass according to the present invention, the thickness changes from the one end to the other end in the display corresponding region.

In a specific aspect of the interlayer film for laminated glass according to the present invention, the interlayer film for laminated glass has a portion in which the cross-sectional shape in the thickness direction is wedge-shaped.

In a specific aspect of the interlayer film for laminated glass according to the present invention, the display corresponding region has a length direction and a width direction, and the width direction of the display corresponding region includes the one end and the other end. It is the direction to tie.

In a specific aspect of the interlayer film for laminated glass according to the present invention, the visible light transmittance of the display corresponding region is 80% or more.

In a specific aspect of the interlayer film for laminated glass according to the present invention, the interlayer film for laminated glass has a shade area apart from the display corresponding area.

In a specific aspect of the interlayer film for laminated glass according to the present invention, the thermoplastic resin is a polyvinyl acetal resin.

In a specific aspect of the interlayer film for laminated glass according to the present invention, the interlayer film for laminated glass includes a plasticizer.

According to a wide aspect of the present invention, the first laminated glass member, the second laminated glass member, and the interlayer film for laminated glass described above are provided, and the first laminated glass member and the second laminated glass are provided. There is provided a laminated glass in which the interlayer film for laminated glass is disposed between the members.

The interlayer film for laminated glass according to the present invention includes a thermoplastic resin, has one end, and the other end having a thickness larger than the one end on the side opposite to the one end, and corresponds to the display area of the head-up display. The display corresponding area and the surrounding area adjacent to the display corresponding area are visually identifiable, or the color or glossiness of the display corresponding area is the display Since the color or glossiness of the surrounding area adjacent to the corresponding area is different, the display corresponding area of the intermediate film corresponding to the display area of the head-up display can be easily recognized when obtaining a laminated glass. Furthermore, in the obtained laminated glass, the display corresponding region of the intermediate film can be more reliably positioned in the display region of the head-up display. For this reason, information can be satisfactorily displayed on the head-up display.

1A and 1B are a cross-sectional view and a front view schematically showing the interlayer film for laminated glass according to the first embodiment of the present invention. 2A and 2B are a sectional view and a front view schematically showing an interlayer film for laminated glass according to the second embodiment of the present invention. FIG. 3 is a cross-sectional view showing an example of a laminated glass using the laminated glass interlayer film shown in FIG.

Hereinafter, the details of the present invention will be described.

The interlayer film for laminated glass according to the present invention (sometimes abbreviated as “intermediate film” in the present specification) is used for laminated glass as a head-up display (HUD). The intermediate film according to the present invention is an HUD intermediate film.

The intermediate film according to the present invention has a single-layer structure or a two-layer structure. The intermediate film according to the present invention may have a single-layer structure or a two-layer structure. The interlayer film according to the present invention may have a two-layer structure or may have a three-layer structure or more. The interlayer film according to the present invention may be a single-layer interlayer film or a multilayer interlayer film.

The intermediate film according to the present invention contains a thermoplastic resin.

The intermediate film according to the present invention has one end and the other end opposite to the one end and having a thickness larger than that of the one end. In the intermediate film according to the present invention, the other end is thicker than the other end. The one end and the other end are end portions on both sides facing each other in the intermediate film.

The intermediate film according to the present invention has a display corresponding area corresponding to the display area of the HUD. The display corresponding area is an area where information can be displayed favorably.

In the intermediate film according to the present invention, the display corresponding region and the surrounding region adjacent to the display corresponding region can be visually identified, or the color or glossiness of the display corresponding region is the display It differs from the color or glossiness of the surrounding area adjacent to the corresponding area.

Since the intermediate film according to the present invention has the above-described configuration, the display corresponding area of the intermediate film corresponding to the display area of the HUD can be easily recognized when obtaining the laminated glass. Therefore, it is possible to easily align the display corresponding area of the laminated glass member having a predetermined size (the area corresponding to the display corresponding area of the obtained laminated glass) and the display corresponding area of the intermediate film. It is possible to prevent displacement between areas. Therefore, the display corresponding region of the intermediate film can be more reliably positioned in the display region of the HUD of the obtained laminated glass. As a result, in the HUD, it is difficult for the information to be seen twice, and the information can be displayed well.

Compared to an intermediate film having a certain thickness, an intermediate film (such as a wedge-shaped intermediate film) having one end and the other end having a thickness larger than the one end on the side opposite to the one end can display the intermediate film. Whereas the alignment of the region is important, in the present invention, the alignment can be performed more reliably.

In addition, since the display corresponding area of the intermediate film can be easily recognized, there is no need to perform an operation of specifying the HUD display corresponding area in advance by measurement or the like when the laminated glass is manufactured. For this reason, the manufacturing efficiency of a laminated glass can be improved considerably.

In addition, the position of the display corresponding area of the glass plate is often different depending on the vehicle type, the mounting location, etc., whereas the display corresponding area of the intermediate film can be easily recognized even when multiple types of laminated glass are obtained. Therefore, the display corresponding area of the intermediate film can be efficiently positioned in the display corresponding area of the glass plate, and the manufacturing efficiency of the laminated glass can be considerably increased.

In the intermediate film according to the present invention, the display corresponding area and the surrounding area adjacent to the display corresponding area may be visually distinguishable. In the intermediate film according to the present invention, the color or glossiness of the display corresponding area may be different from the color or glossiness of the surrounding area adjacent to the display corresponding area. Since the color or glossiness of the display corresponding area is different from the color or glossiness of the surrounding area adjacent to the display corresponding area, the surrounding area adjacent to the display corresponding area can be visually identified. Also good. Since the display correspondence area is more recognizable, the intermediate film can be easily manufactured without impairing the original function of the intermediate film, so that the color of the display correspondence area is different from the color of the surrounding area adjacent to the display correspondence area. It is preferable. It is also preferable that the glossiness of the display-corresponding area is different from the glossiness of the surrounding area adjacent to the display-corresponding area, since the display-corresponding area is more recognizable.

Whether or not the display corresponding area and the surrounding area adjacent to the display corresponding area can be visually identified is determined as follows.

Judgment is made based on whether or not a person having normal visual acuity (for example, visual acuity 1.0) can discriminate when viewing the main surface of the intermediate film in a vertical direction from a position 70 cm away.

From the viewpoint of further improving the display, it is preferable that the thickness changes from the one end to the other end in the display corresponding region. From the viewpoint of further improving the display, it is preferable that the thickness increases from the one end to the other end in the display corresponding region.

The interlayer film according to the present invention may have a shade region. The shade area may be separated from the display corresponding area. The shade region is provided for the purpose of preventing the driver during driving from feeling dazzled by, for example, sunlight or outdoor lighting. The shade region may be provided to provide heat shielding properties. The shade region is preferably located at the edge of the intermediate film. The shade region is preferably strip-shaped.

From the viewpoint of further improving the display and further expanding the visual field, the visible light transmittance of the display corresponding region is preferably 80% or more, more preferably 88% or more, and still more preferably 90% or more.

It is preferable that the visible light transmittance of the display corresponding region is higher than the visible light transmittance of the shade region. The visible light transmittance of the display corresponding region may be lower than the visible light transmittance of the shade region. The visible light transmittance of the display corresponding region is preferably 50% or more, more preferably 60% or more higher than the visible light transmittance of the shade region. The visible light transmittance of the display corresponding region is preferably lower than the visible light transmittance of the surrounding region. The visible light transmittance of the display corresponding region is preferably lower than the visible light transmittance of the surrounding region, preferably 1% or lower, more preferably 5% or lower, and still more preferably 10% or lower.

For example, when the visible light transmittance changes in the intermediate film of the display corresponding region and the shade region, the visible light transmittance is measured at the center position of the display corresponding region and the center position of the shade region. The

Using a spectrophotometer ("U-4100" manufactured by Hitachi High-Tech), the visible light transmittance at a wavelength of 380 to 780 nm of the obtained laminated glass can be measured according to JIS R3211 (1998). . In addition, it is preferable to use a clear glass having a thickness of 2 mm as the glass plate.

In the shade area and the display corresponding area, a colorant or a filler may be used to change the color and visible light transmittance. The colorant or filler may be included only in a partial region in the thickness direction of the intermediate film, or may be included in the entire region in the thickness direction of the intermediate film.

The display corresponding area preferably has a length direction and a width direction. Since the intermediate film is excellent in versatility, it is preferable that the width direction of the display corresponding region is a direction connecting the one end and the other end. The display-corresponding region is preferably strip-shaped.

The intermediate film preferably has an MD direction and a TD direction. The intermediate film is obtained by, for example, melt extrusion molding. The MD direction is the flow direction of the intermediate film during the production of the intermediate film. The TD direction is a direction orthogonal to the flow direction of the intermediate film at the time of manufacturing the intermediate film, and is a direction orthogonal to the thickness direction of the intermediate film. It is preferable that the one end and the other end are located on both sides in the TD direction.

From the viewpoint of further improving the display, it is preferable that the intermediate film has a portion having a wedge-shaped cross-sectional shape in the thickness direction. The cross-sectional shape in the thickness direction of the display corresponding region is preferably a wedge shape.

Since the glossiness and the like can be controlled, it is preferable that the intermediate film has an uneven shape on at least one of the surfaces on both sides in the display corresponding region. In the display corresponding region, it is more preferable that the intermediate film has an uneven shape on both surfaces. The uneven shape of the display corresponding region is preferably different from the uneven shape of the surrounding region.

The method for forming the uneven shape is not particularly limited, and examples thereof include a lip embossing method, an embossing roll method, a calendar roll method, and a profile extrusion method. The embossing roll method is preferable because it can form a large number of concavo-convex embossments that are quantitatively constant. The surface of the intermediate film is preferably embossed by an embossing roll method.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIGS. 1A and 1B schematically show a cross-sectional view and a front view of an interlayer film for laminated glass according to a first embodiment of the present invention. FIG. 1A is a cross-sectional view taken along the line II in FIG. Note that the size and dimensions of the interlayer film in FIG. 1 and the drawings to be described later are appropriately changed from the actual size and shape for convenience of illustration.

FIG. 1A shows a cross section in the thickness direction of the intermediate film 11. In FIG. 1A and the drawings described later, for convenience of illustration, the thickness of each layer constituting the intermediate film and the intermediate film, and the wedge angle θ are shown to be different from the actual thickness and wedge angle. .

The intermediate film 11 includes a first layer 1 (intermediate layer), a second layer 2 (surface layer), and a third layer 3 (surface layer). On the first surface side of the first layer 1, the second layer 2 is disposed and laminated. On the second surface side opposite to the first surface of the first layer 1, the third layer 3 is disposed and laminated. The first layer 1 is arranged between the second layer 2 and the third layer 3 and is sandwiched between them. The intermediate film 11 is used to obtain a laminated glass. The intermediate film 11 is an intermediate film for laminated glass. The intermediate film 11 is a multilayer intermediate film.

The intermediate film 11 has one end 11a and the other end 11b on the opposite side of the one end 11a. The one end 11a and the other end 11b are opposite ends on opposite sides. The cross-sectional shape in the thickness direction of the second layer 2 and the third layer 3 is a wedge shape. The cross-sectional shape in the thickness direction of the first layer 1 is a rectangle. The thicknesses of the second layer 2 and the third layer 3 are larger on the other end 11b side than on the one end 11a side. Therefore, the thickness of the other end 11b of the intermediate film 11 is larger than the thickness of the one end 11a. Therefore, the intermediate film 11 has a thin region and a thick region.

The intermediate film 11 has a display corresponding region R1 corresponding to the display region of the head-up display. The display corresponding region R1 and the surrounding region R2 adjacent to the display corresponding region R1 can be visually identified, or the color or glossiness of the display corresponding region R1 is adjacent to the display corresponding region R1 Different from R2 color or gloss.

The intermediate film 11 has a shade region R3 apart from the display corresponding region R1. The shade region R3 is located at the edge of the intermediate film 11.

FIGS. 2A and 2B schematically show a cross-sectional view and a front view of an interlayer film for laminated glass according to a second embodiment of the present invention. FIG. 2A is a cross-sectional view taken along the line II in FIG. FIG. 2A shows a cross section in the thickness direction of the intermediate film 11A.

The intermediate film 11A shown in FIG. 2 includes the first layer 1A. The intermediate film 11A has a single-layer structure including only the first layer 1A, and is a single-layer intermediate film. The intermediate film 11A is the first layer 1A. The intermediate film 11A is used to obtain a laminated glass. The intermediate film 11A is an intermediate film for laminated glass.

The intermediate film 11A has one end 11a and the other end 11b on the opposite side to the one end 11a. The one end 11a and the other end 11b are opposite ends on opposite sides. The thickness of the other end 11b of the intermediate film 11A is larger than the thickness of the one end 11a. Accordingly, the intermediate film 11A and the first layer 1A have a thin region and a thick region.

The intermediate film 11A and the first layer 1A have portions 11Aa and 1Aa whose cross-sectional shape in the thickness direction is rectangular, and portions 11Ab and 1Ab whose cross-sectional shape in the thickness direction are wedge-shaped.

The intermediate film 11A has a display corresponding region R1 corresponding to the display region of the head-up display. The display corresponding region R1 and the surrounding region R2 adjacent to the display corresponding region R1 can be visually identified, or the color or glossiness of the display corresponding region R1 is adjacent to the display corresponding region R1 Different from R2 color or gloss.

The intermediate film 11A has a shade region R3 apart from the display corresponding region R1. The shade region R3 is located at the edge of the intermediate film 11A.

The intermediate film preferably has a portion having a wedge-shaped cross-sectional shape in the thickness direction. The intermediate film preferably has a portion where the thickness gradually increases from one end to the other end. The cross-sectional shape in the thickness direction of the intermediate film is preferably a wedge shape. Examples of the cross-sectional shape in the thickness direction of the intermediate film include a trapezoid, a triangle, and a pentagon.

In order to suppress the double image, the wedge angle θ of the interlayer film can be appropriately set according to the attachment angle of the laminated glass. From the viewpoint of further suppressing the double image, the wedge angle θ of the interlayer film is preferably 0.01 mrad (0.0006 degrees) or more, more preferably 0.2 mrad (0.0115 degrees) or more, preferably 2 mrad. (0.1146 degrees) or less, more preferably 0.7 mrad (0.0401 degrees) or less. The wedge angle θ is a straight line connecting the first surface portion of the intermediate film between the maximum thickness portion and the minimum thickness portion and a straight line connecting the second surface portion of the intermediate film between the maximum thickness portion and the minimum thickness portion. Is the inner angle at the intersection with.

The thickness of the intermediate film is not particularly limited. The thickness of the intermediate film indicates the total thickness of each layer constituting the intermediate film. Therefore, in the case of the multilayer intermediate film 11, the thickness of the intermediate film indicates the total thickness of the first layer 1, the second layer 2, and the third layer 3.

The maximum thickness of the interlayer film is preferably 0.1 mm or more, more preferably 0.25 mm or more, further preferably 0.5 mm or more, particularly preferably 0.8 mm or more, preferably 3 mm or less, more preferably 2 mm or less, still more preferably Is 1.5 mm or less.

When the distance between one end and the other end is X, the intermediate film has a minimum thickness in a region of a distance of 0X to 0.2X from one end to the inside, and 0X from the other end to the inside. Preferably, the intermediate film has a maximum thickness in a region having a distance of ˜0.2X, and the intermediate film has a minimum thickness in a region having a distance of 0X to 0.1X from one end to the inside, and from the other end to the inside. It is more preferable to have the maximum thickness in a region with a distance of 0X to 0.1X. Preferably, the intermediate film has a minimum thickness at one end and the intermediate film has a maximum thickness at the other end. The intermediate films 11 and 11A have a maximum thickness at the other end 11b and a minimum thickness at the one end 11a.

From the viewpoint of practical use and from the viewpoint of sufficiently increasing the adhesive strength and penetration resistance, the maximum thickness of the surface layer is preferably 0.001 mm or more, more preferably 0.2 mm or more, still more preferably 0.3 mm or more, preferably Is 1 mm or less, more preferably 0.8 mm or less.

From the viewpoint of practical use and the viewpoint of sufficiently increasing the penetration resistance, the maximum thickness of the layer (intermediate layer) disposed between the two surface layers is 0.001 mm or more, more preferably 0.8 mm. It is 1 mm or more, more preferably 0.2 mm or more, preferably 0.8 mm or less, more preferably 0.6 mm or less, and still more preferably 0.3 mm or less.

Hereinafter, the details of the materials constituting each layer of the multilayer interlayer film and the single-layer interlayer film will be described.

(Thermoplastic resin)
The thermoplastic resin contained in the intermediate film (each layer) according to the present invention is not particularly limited. As the thermoplastic resin, a conventionally known thermoplastic resin can be used. As for the said thermoplastic resin, only 1 type may be used and 2 or more types may be used together.

Examples of the thermoplastic resin include polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, and polyvinyl alcohol resin. Thermoplastic resins other than these may be used.

The thermoplastic resin is preferably a polyvinyl acetal resin. By the combined use of the polyvinyl acetal resin and the plasticizer, the adhesion of the interlayer film according to the present invention to the laminated glass member or other interlayer film is further increased.

The polyvinyl acetal resin can be produced, for example, by acetalizing polyvinyl alcohol (PVA) with an aldehyde. The polyvinyl acetal resin is preferably an acetalized product of polyvinyl alcohol. The polyvinyl alcohol can be produced, for example, by saponifying polyvinyl acetate. The saponification degree of the polyvinyl alcohol is generally in the range of 70 to 99.9 mol%.

The average degree of polymerization of the polyvinyl alcohol is preferably 200 or more, more preferably 500 or more, still more preferably 1500 or more, still more preferably 1600 or more, particularly preferably 2600 or more, most preferably 2700 or more, preferably 5000 or less, More preferably, it is 4000 or less, More preferably, it is 3500 or less. When the average degree of polymerization is not less than the above lower limit, the penetration resistance of the laminated glass is further enhanced. When the average degree of polymerization is not more than the above upper limit, the intermediate film can be easily molded.

The average degree of polymerization of the polyvinyl alcohol is determined by a method based on JIS K6726 “Testing method for polyvinyl alcohol”.

The carbon number of the acetal group contained in the polyvinyl acetal resin is not particularly limited. The aldehyde used when manufacturing the said polyvinyl acetal resin is not specifically limited. The carbon number of the acetal group in the polyvinyl acetal resin is preferably 3 or 4. When the carbon number of the acetal group in the polyvinyl acetal resin is 3 or more, the glass transition temperature of the intermediate film is sufficiently low.

The aldehyde is not particularly limited. In general, aldehydes having 1 to 10 carbon atoms are preferably used. Examples of the aldehyde having 1 to 10 carbon atoms include propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexylaldehyde, n-octylaldehyde, and n-nonylaldehyde. N-decylaldehyde, formaldehyde, acetaldehyde, benzaldehyde and the like. Propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexylaldehyde or n-valeraldehyde is preferred, propionaldehyde, n-butyraldehyde or isobutyraldehyde is more preferred, and n-butyraldehyde is still more preferred. As for the said aldehyde, only 1 type may be used and 2 or more types may be used together.

The hydroxyl group content (hydroxyl content) of the polyvinyl acetal resin is preferably 15 mol% or more, more preferably 18 mol% or more, preferably 40 mol% or less, more preferably 35 mol% or less. When the hydroxyl group content is at least the above lower limit, the adhesive strength of the interlayer film is further increased. Further, when the hydroxyl group content is not more than the above upper limit, the flexibility of the interlayer film is increased, and the handling of the interlayer film is facilitated.

The hydroxyl group content of the polyvinyl acetal resin is a value indicating the mole fraction obtained by dividing the amount of ethylene groups to which the hydroxyl group is bonded by the total amount of ethylene groups in the main chain, as a percentage. The amount of the ethylene group to which the hydroxyl group is bonded can be determined, for example, by measuring in accordance with JIS K6728 “Testing methods for polyvinyl butyral” or in accordance with ASTM D1396-92.

The degree of acetylation (acetyl group amount) of the polyvinyl acetal resin is preferably 0.1 mol% or more, more preferably 0.3 mol% or more, still more preferably 0.5 mol% or more, preferably 30 mol% or less. More preferably, it is 25 mol% or less, More preferably, it is 20 mol% or less. When the acetylation degree is not less than the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer is increased. When the acetylation degree is not more than the above upper limit, the moisture resistance of the interlayer film and the laminated glass is increased.

The degree of acetylation is obtained by subtracting the amount of ethylene groups to which acetal groups are bonded and the amount of ethylene groups to which hydroxyl groups are bonded from the total amount of ethylene groups of the main chain, It is a value indicating the mole fraction obtained by dividing by the percentage. The amount of ethylene group to which the acetal group is bonded can be measured, for example, according to JIS K6728 “Testing method for polyvinyl butyral” or according to ASTM D1396-92.

The degree of acetalization of the polyvinyl acetal resin (in the case of polyvinyl butyral resin, the degree of butyralization) is preferably 60 mol% or more, more preferably 63 mol% or more, preferably 85 mol% or less, more preferably 75 mol%. Hereinafter, it is 70 mol% or less more preferably. When the degree of acetalization is not less than the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer increases. When the degree of acetalization is less than or equal to the above upper limit, the reaction time required for producing a polyvinyl acetal resin is shortened.

The above-mentioned degree of acetalization is a value indicating the mole fraction obtained by dividing the amount of ethylene groups to which acetal groups are bonded by the total amount of ethylene groups in the main chain as a percentage.

The degree of acetalization can be calculated by a method based on JIS K6728 “Testing methods for polyvinyl butyral” or a method based on ASTM D1396-92.

The hydroxyl group content (hydroxyl content), acetalization degree (butyralization degree), and acetylation degree are preferably calculated from results measured by a method in accordance with JIS K6728 “Testing methods for polyvinyl butyral”. When the polyvinyl acetal resin is a polyvinyl butyral resin, the hydroxyl group content (hydroxyl content), the degree of acetalization (degree of butyralization) and the degree of acetylation are measured by a method according to JIS K6728 “Testing methods for polyvinyl butyral” It is preferable to calculate from the obtained results.

(Plasticizer)
From the viewpoint of further increasing the adhesive strength of the intermediate film, the intermediate film (each layer) according to the present invention preferably contains a plasticizer. When the thermoplastic resin contained in the intermediate film is a polyvinyl acetal resin, the intermediate film (each layer) particularly preferably contains a plasticizer. The layer containing the polyvinyl acetal resin preferably contains a plasticizer.

The plasticizer is not particularly limited. A conventionally known plasticizer can be used as the plasticizer. As for the said plasticizer, only 1 type may be used and 2 or more types may be used together.

Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and organic phosphate plasticizers such as organic phosphate plasticizers and organic phosphite plasticizers. Can be mentioned. Organic ester plasticizers are preferred. The plasticizer is preferably a liquid plasticizer.

The monobasic organic acid ester is not particularly limited. For example, a glycol ester obtained by reaction of glycol with a monobasic organic acid, and triethylene glycol or tripropylene glycol with a monobasic organic acid. Examples include esters. Examples of the glycol include triethylene glycol, tetraethylene glycol, and tripropylene glycol. Examples of the monobasic organic acid include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptylic acid, n-octylic acid, 2-ethylhexylic acid, n-nonylic acid, and decylic acid.

The polybasic organic acid ester is not particularly limited, and examples thereof include an ester compound of a polybasic organic acid and an alcohol having a linear or branched structure having 4 to 8 carbon atoms. Examples of the polybasic organic acid include adipic acid, sebacic acid, and azelaic acid.

The organic ester plasticizer is not particularly limited, and triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, triethylene glycol di-n- Octanoate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethyl butyrate, 1,3-propylene glycol di -2-Ethyl butyrate, 1,4-butylene glycol di-2-ethyl butyrate, diethylene glycol di-2-ethyl butyrate, diethylene glycol di-2-ethyl hexanoate, dipropylene glycol Rudi-2-ethylbutyrate, triethylene glycol di-2-ethylpentanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprate, dihexyl adipate, dioctyl adipate, hexyl cyclohexyl adipate, adipine Examples include a mixture of heptyl acid and nonyl adipate, diisononyl adipate, diisodecyl adipate, heptylnonyl adipate, dibutyl sebacate, alkyd oil-modified sebacic acid, and a mixture of phosphate ester and adipate. Organic ester plasticizers other than these may be used.

The organic phosphate plasticizer is not particularly limited, and examples thereof include tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphate, and the like.

The plasticizer is preferably a diester plasticizer represented by the following formula (1).

In the above formula (1), R1 and R2 each represents an organic group having 5 to 10 carbon atoms, R3 represents an ethylene group, an isopropylene group or an n-propylene group, and p represents an integer of 3 to 10 . R1 and R2 in the above formula (1) are each preferably an organic group having 6 to 10 carbon atoms.

The plasticizer preferably contains triethylene glycol di-2-ethylhexanoate (3GO) or triethylene glycol di-2-ethylbutyrate (3GH). Triethylene glycol di-2-ethylhexanoate It is more preferable to contain.

The content of the plasticizer is not particularly limited. In each layer, the content of the plasticizer is preferably 25 parts by weight or more, more preferably 30 parts by weight or more, preferably 100 parts by weight or less, more preferably 60 parts by weight with respect to 100 parts by weight of the thermoplastic resin. Hereinafter, it is more preferably 50 parts by weight or less. When the content of the plasticizer is not less than the above lower limit, the penetration resistance of the laminated glass is further enhanced. When the content of the plasticizer is not more than the above upper limit, the transparency of the interlayer film is further enhanced.

(Thermal barrier compound)
The intermediate film preferably contains a heat shielding compound. The first layer preferably contains a heat shielding compound. The second layer preferably contains a heat shielding compound. The third layer preferably includes a heat shielding compound. As for the said heat-shielding compound, only 1 type may be used and 2 or more types may be used together.

Component X:
The intermediate film preferably includes at least one component X among a phthalocyanine compound, a naphthalocyanine compound, and an anthracocyanine compound. The first layer preferably contains the component X. The second layer preferably contains the component X. The third layer preferably contains the component X. The component X is a heat shielding compound. As for the said component X, only 1 type may be used and 2 or more types may be used together.

The component X is not particularly limited. As component X, conventionally known phthalocyanine compounds, naphthalocyanine compounds and anthracocyanine compounds can be used.

Examples of the component X include phthalocyanine, a derivative of phthalocyanine, naphthalocyanine, a derivative of naphthalocyanine, an anthocyanin, and an anthocyanin derivative. The phthalocyanine compound and the phthalocyanine derivative preferably each have a phthalocyanine skeleton. The naphthalocyanine compound and the naphthalocyanine derivative preferably each have a naphthalocyanine skeleton. It is preferable that each of the anthocyanin compound and the derivative of the anthracyanine has an anthracyanine skeleton.

From the viewpoint of further increasing the heat shielding properties of the interlayer film and the laminated glass, the component X is preferably at least one selected from the group consisting of phthalocyanine, phthalocyanine derivatives, naphthalocyanine, and naphthalocyanine derivatives. More preferably, it is at least one of phthalocyanine and phthalocyanine derivatives.

From the viewpoint of effectively increasing the heat shielding property and maintaining the visible light transmittance at a higher level over a long period of time, the component X preferably contains a vanadium atom or a copper atom. The component X preferably contains a vanadium atom, and preferably contains a copper atom. The component X is more preferably at least one of a phthalocyanine containing a vanadium atom or a copper atom and a phthalocyanine derivative containing a vanadium atom or a copper atom. From the viewpoint of further increasing the heat shielding properties of the interlayer film and the laminated glass, the component X preferably has a structural unit in which an oxygen atom is bonded to a vanadium atom.

In 100% by weight of the layer containing the component X (first layer, second layer or third layer), the content of the component X is preferably 0.001% by weight or more, more preferably 0.005. % By weight or more, more preferably 0.01% by weight or more, particularly preferably 0.02% by weight or more, preferably 0.2% by weight or less, more preferably 0.1% by weight or less, still more preferably 0.05% by weight. % Or less, particularly preferably 0.04% by weight or less. When the content of the component X is not less than the above lower limit and not more than the above upper limit, the heat shielding property is sufficiently high and the visible light transmittance is sufficiently high. For example, the visible light transmittance can be 70% or more.

Thermal barrier particles:
The intermediate film preferably contains heat shielding particles. The first layer preferably contains the heat shielding particles. The second layer preferably includes the heat shielding particles. The third layer preferably contains the heat shielding particles. The heat shielding particles are heat shielding compounds. By using heat shielding particles, infrared rays (heat rays) can be effectively blocked. As for the said heat-shielding particle, only 1 type may be used and 2 or more types may be used together.

From the viewpoint of further improving the heat shielding property of the laminated glass, the heat shielding particles are more preferably metal oxide particles. The heat shielding particles are preferably particles (metal oxide particles) formed of a metal oxide.

¡Infrared rays having a wavelength longer than 780 nm longer than visible light have a smaller amount of energy than ultraviolet rays. However, infrared rays have a large thermal effect, and when infrared rays are absorbed by a substance, they are released as heat. For this reason, infrared rays are generally called heat rays. By using the heat shielding particles, infrared rays (heat rays) can be effectively blocked. The heat shielding particles mean particles that can absorb infrared rays.

Specific examples of the heat shielding particles include aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide particles (ATO particles), gallium-doped zinc oxide particles (GZO particles), and indium-doped zinc oxide particles (IZO particles). ), Aluminum doped zinc oxide particles (AZO particles), niobium doped titanium oxide particles, sodium doped tungsten oxide particles, cesium doped tungsten oxide particles, thallium doped tungsten oxide particles, rubidium doped tungsten oxide particles, tin doped indium oxide particles (ITO particles) And metal oxide particles such as tin-doped zinc oxide particles and silicon-doped zinc oxide particles, and lanthanum hexaboride (LaB ₆ ) particles. Heat shielding particles other than these may be used. Metal oxide particles are preferred because of their high heat ray shielding function, ATO particles, GZO particles, IZO particles, ITO particles or tungsten oxide particles are more preferred, and ITO particles or tungsten oxide particles are particularly preferred. In particular, tin-doped indium oxide particles (ITO particles) are preferable, and tungsten oxide particles are also preferable because they have a high heat ray shielding function and are easily available.

From the viewpoint of further increasing the heat shielding properties of the interlayer film and the laminated glass, the tungsten oxide particles are preferably metal-doped tungsten oxide particles. The “tungsten oxide particles” include metal-doped tungsten oxide particles. Specific examples of the metal-doped tungsten oxide particles include sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, and rubidium-doped tungsten oxide particles.

From the viewpoint of further increasing the heat shielding properties of the interlayer film and the laminated glass, cesium-doped tungsten oxide particles are particularly preferable. From the viewpoint of further increasing the heat shielding properties of the interlayer film and the laminated glass, the cesium-doped tungsten oxide particles are preferably tungsten oxide particles represented by the formula: Cs _0.33 WO ₃ .

The average particle diameter of the heat shielding particles is preferably 0.01 μm or more, more preferably 0.02 μm or more, preferably 0.1 μm or less, more preferably 0.05 μm or less. When the average particle size is not less than the above lower limit, the heat ray shielding property is sufficiently increased. When the average particle size is not more than the above upper limit, the dispersibility of the heat shielding particles is increased.

The above “average particle diameter” indicates the volume average particle diameter. The average particle diameter can be measured using a particle size distribution measuring device (“UPA-EX150” manufactured by Nikkiso Co., Ltd.) or the like.

In 100% by weight of the layer containing the heat shielding particles (first layer, second layer or third layer), each content of the heat shielding particles (particularly the content of tungsten oxide particles) is preferably 0. 0.01% by weight or more, more preferably 0.1% by weight or more, still more preferably 1% by weight or more, particularly preferably 1.5% by weight or more, preferably 6% by weight or less, more preferably 5.5% by weight or less. More preferably, it is 4% by weight or less, particularly preferably 3.5% by weight or less, and most preferably 3% by weight or less. When the content of the heat shielding particles is not less than the above lower limit and not more than the above upper limit, the heat shielding property is sufficiently high and the visible light transmittance is sufficiently high.

(Metal salt)
The intermediate film preferably contains at least one metal salt (hereinafter sometimes referred to as a metal salt M) of an alkali metal salt and an alkaline earth metal salt. The first layer preferably includes the metal salt M. The second layer preferably contains the metal salt M. The third layer preferably contains the metal salt M. Use of the metal salt M makes it easy to control the adhesion between the interlayer film and the glass plate or the adhesion between the layers in the interlayer film. As for the said metal salt M, only 1 type may be used and 2 or more types may be used together.

The metal salt M preferably contains at least one metal selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba. The metal salt contained in the interlayer film preferably contains at least one metal of K and Mg.

The metal salt M is more preferably an alkali metal salt of an organic acid having 2 to 16 carbon atoms or an alkaline earth metal salt of an organic acid having 2 to 16 carbon atoms, and a carboxylic acid having 2 to 16 carbon atoms. More preferably, it is a magnesium salt or a potassium salt of a carboxylic acid having 2 to 16 carbon atoms.

Examples of the magnesium salt of carboxylic acid having 2 to 16 carbon atoms and the potassium salt of carboxylic acid having 2 to 16 carbon atoms include, but are not limited to, for example, magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, 2-ethylbutyric acid Examples include magnesium, potassium 2-ethylbutanoate, magnesium 2-ethylhexanoate and potassium 2-ethylhexanoate.

The total content of Mg and K in the layer containing the metal salt M (first layer, second layer, or third layer) is preferably 5 ppm or more, more preferably 10 ppm or more, and even more preferably 20 ppm or more. , Preferably 300 ppm or less, more preferably 250 ppm or less, still more preferably 200 ppm or less. When the total content of Mg and K is not less than the above lower limit and not more than the above upper limit, the adhesion between the interlayer film and the glass plate or the adhesion between the layers in the interlayer film can be controlled even better.

(UV shielding agent)
The intermediate film preferably contains an ultraviolet shielding agent. The first layer preferably contains an ultraviolet shielding agent. The second layer preferably contains an ultraviolet shielding agent. The third layer preferably contains an ultraviolet shielding agent. By using the ultraviolet shielding agent, even if the interlayer film and the laminated glass are used for a long period of time, the visible light transmittance is more unlikely to decrease. As for the said ultraviolet shielding agent, only 1 type may be used and 2 or more types may be used together.

The ultraviolet shielding agent includes an ultraviolet absorber. The ultraviolet shielding agent is preferably an ultraviolet absorber.

Examples of the ultraviolet shielding agent include metal ultraviolet shielding agents, metal oxide ultraviolet shielding agents, benzotriazole ultraviolet shielding agents (benzotriazole compounds), benzophenone ultraviolet shielding agents (benzophenone compounds), and triazine ultraviolet shielding agents. (Triazine compound), malonic acid ester ultraviolet screening agent (malonic acid ester compound), oxalic acid anilide ultraviolet screening agent (oxalic acid anilide compound), benzoate ultraviolet screening agent (benzoate compound) and the like.

Examples of the metallic ultraviolet absorber include platinum particles, particles in which the surface of the platinum particles is coated with silica, palladium particles, particles in which the surface of the palladium particles is coated with silica, and the like. The ultraviolet shielding agent is preferably not a heat shielding particle.

The ultraviolet shielding agent is preferably a benzotriazole ultraviolet shielding agent, a benzophenone ultraviolet shielding agent, a triazine ultraviolet shielding agent or a benzoate ultraviolet shielding agent, more preferably a benzotriazole ultraviolet shielding agent or a benzophenone ultraviolet shielding agent. More preferred are benzotriazole ultraviolet absorbers.

Examples of the metal oxide ultraviolet absorber include zinc oxide, titanium oxide, and cerium oxide. Furthermore, the surface may be coat | covered regarding the said metal oxide type ultraviolet absorber. Examples of the coating material on the surface of the metal oxide ultraviolet absorber include insulating metal oxides, hydrolyzable organosilicon compounds, and silicone compounds.

Examples of the insulating metal oxide include silica, alumina and zirconia. The insulating metal oxide has a band gap energy of 5.0 eV or more, for example.

Examples of the benzotriazole ultraviolet absorber include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole (“TinvinP” manufactured by BASF), 2- (2′-hydroxy-3 ′, 5 ′). -Di-t-butylphenyl) benzotriazole ("Tinvin 320" manufactured by BASF), 2- (2'-hydroxy-3'-t-butyl-5-methylphenyl) -5-chlorobenzotriazole (manufactured by BASF " And benzotriazole-based ultraviolet absorbers such as 2- (2′-hydroxy-3 ′, 5′-di-amylphenyl) benzotriazole (“Tinvin 328” manufactured by BASF)). The ultraviolet shielding agent is preferably a benzotriazole-based ultraviolet absorber containing a halogen atom, and more preferably a benzotriazole-based ultraviolet absorber containing a chlorine atom, because of its excellent ability to absorb ultraviolet rays.

Examples of the benzophenone-based ultraviolet absorber include octabenzone (“Chimasorb 81” manufactured by BASF).

Examples of the triazine-based ultraviolet absorber include “LA-F70” manufactured by ADEKA and 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy]. -Phenol ("Tinuvin 1577FF" manufactured by BASF) and the like.

Examples of the malonic ester-based ultraviolet shielding agent include 2- (p-methoxybenzylidene) malonic acid dimethyl, tetraethyl-2,2- (1,4-phenylenedimethylidene) bismalonate, 2- (p-methoxybenzylidene) -bis. (1,2,2,6,6-pentamethyl 4-piperidinyl) malonate and the like.

As commercial products of the above-mentioned malonic ester-based ultraviolet screening agents, there are Hostavin B-CAP, Hostavin PR-25, and Hostavin PR-31 (all manufactured by Clariant).

Examples of the oxalic acid anilide-based ultraviolet shielding agent include N- (2-ethylphenyl) -N ′-(2-ethoxy-5-tert-butylphenyl) oxalic acid diamide, N- (2-ethylphenyl) -N ′. Oxalic acid diamides having an aryl group substituted on the nitrogen atom, such as-(2-ethoxy-phenyl) oxalic acid diamide, 2-ethyl-2'-ethoxy-oxyanilide ("Sanduvor VSU" manufactured by Clariant) Can be mentioned.

Examples of the benzoate ultraviolet absorber include 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate (“Tinuvin 120” manufactured by BASF).

From the viewpoint of further suppressing a decrease in visible light transmittance after a lapse of time, the ultraviolet shielding is performed in 100% by weight of the layer containing the ultraviolet shielding agent (first layer, second layer, or third layer). The content of the agent and the content of the benttriazole compound are preferably 0.1% by weight or more, more preferably 0.2% by weight or more, still more preferably 0.3% by weight or more, and particularly preferably 0.5% by weight. Above, preferably 2.5% by weight or less, more preferably 2% by weight or less, further preferably 1% by weight or less, and particularly preferably 0.8% by weight or less. In particular, in 100% by weight of the layer containing the ultraviolet shielding agent, the content of the ultraviolet shielding agent is 0.2% by weight or more, thereby reducing the visible light transmittance after the passage of the intermediate film and the laminated glass. Remarkably suppressed.

(Antioxidant)
The intermediate film preferably contains an antioxidant. The first layer preferably contains an antioxidant. The second layer preferably contains an antioxidant. The third layer preferably contains an antioxidant. As for the said antioxidant, only 1 type may be used and 2 or more types may be used together.

Examples of the antioxidant include phenol-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants. The phenolic antioxidant is an antioxidant having a phenol skeleton. The sulfur-based antioxidant is an antioxidant containing a sulfur atom. The phosphorus antioxidant is an antioxidant containing a phosphorus atom.

The antioxidant is preferably a phenolic antioxidant or a phosphorus antioxidant.

Examples of the phenolic antioxidant include 2,6-di-t-butyl-p-cresol (BHT), butylated hydroxyanisole (BHA), 2,6-di-t-butyl-4-ethylphenol, stearyl -Β- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,2'-methylenebis- (4-methyl-6-butylphenol), 2,2'-methylenebis- (4-ethyl- 6-t-butylphenol), 4,4′-butylidene-bis- (3-methyl-6-t-butylphenol), 1,1,3-tris- (2-methyl-hydroxy-5-tert-butylphenyl) Butane, tetrakis [methylene-3- (3 ′, 5′-butyl-4-hydroxyphenyl) propionate] methane, 1,3,3-tris- (2-methyl-4- Droxy-5-tert-butylphenol) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, bis (3,3′- and t-butylphenol) butyric acid glycol ester and bis (3-t-butyl-4-hydroxy-5-methylbenzenepropanoic acid) ethylenebis (oxyethylene). One or more of these antioxidants are preferably used.

Examples of the phosphorus antioxidant include tridecyl phosphite, tris (tridecyl) phosphite, triphenyl phosphite, trinonylphenyl phosphite, bis (tridecyl) pentaerythritol diphosphite, bis (decyl) pentaerythritol diphos. Phyto, tris (2,4-di-t-butylphenyl) phosphite, bis (2,4-di-t-butyl-6-methylphenyl) ethyl ester phosphorous acid, tris (2,4-di-t -Butylphenyl) phosphite, 2,2'-methylenebis (4,6-di-t-butyl-1-phenyloxy) (2-ethylhexyloxy) phosphorus, and the like. One or more of these antioxidants are preferably used.

Examples of the commercially available antioxidants include “IRGANOX 245” manufactured by BASF, “IRGAFOS 168” manufactured by BASF, “IRGAFOS 38” manufactured by BASF, “Smilizer BHT” manufactured by Sumitomo Chemical, and “ IRGANOX 1010 ".

In order to maintain the high visible light transmittance of the interlayer film and the laminated glass over a long period of time, a layer (first layer, second layer or third layer) in 100% by weight of the interlayer film or containing an antioxidant. ) In 100% by weight, the content of the antioxidant is preferably 0.1% by weight or more. Further, since the effect of adding the antioxidant is saturated, the content of the antioxidant is preferably 2% by weight or less in 100% by weight of the intermediate film or 100% by weight of the layer containing the antioxidant. .

(Other ingredients)
The first layer, the second layer, and the third layer are each added with a flame retardant, an antistatic agent, a pigment, a dye, a moisture-proofing agent, a fluorescent brightening agent, an infrared absorber, and the like as necessary. An agent may be included. As for these additives, only 1 type may be used and 2 or more types may be used together.

(Laminated glass)
FIG. 3 is a sectional view showing an example of laminated glass using the laminated glass interlayer film shown in FIG.

The laminated glass 21 shown in FIG. 3 includes the intermediate film 11, a first laminated glass member 22, and a second laminated glass member 23. The intermediate film 11 is disposed between the first laminated glass member 22 and the second laminated glass member 23 and is sandwiched. A first laminated glass member 22 is disposed on the first surface of the intermediate film 11. A second laminated glass member 23 is disposed on the second surface opposite to the first surface of the intermediate film 11.

Examples of the laminated glass member include a glass plate and a PET (polyethylene terephthalate) film. The laminated glass includes not only laminated glass in which an intermediate film is sandwiched between two glass plates, but also laminated glass in which an intermediate film is sandwiched between a glass plate and a PET film or the like. Laminated glass is a laminated body provided with a glass plate, and preferably at least one glass plate is used. The first laminated glass member and the second laminated glass member are respectively a glass plate or a PET (polyethylene terephthalate) film, and the intermediate film is the first laminated glass member and the second laminated glass member. It is preferable that at least one glass plate is included. It is particularly preferable that both the first laminated glass member and the second laminated glass member are glass plates.

Examples of the glass plate include inorganic glass and organic glass. Examples of the inorganic glass include float plate glass, heat ray absorbing plate glass, heat ray reflecting plate glass, polished plate glass, mold plate glass, wire-containing plate glass, and green glass. The organic glass is a synthetic resin glass substituted for inorganic glass. Examples of the organic glass include polycarbonate plates and poly (meth) acrylic resin plates. Examples of the poly (meth) acrylic resin plate include a polymethyl (meth) acrylate plate.

The thicknesses of the first laminated glass member and the second laminated glass member are not particularly limited, but are preferably 1 mm or more and preferably 5 mm or less. When the laminated glass member is a glass plate, the thickness of the glass plate is preferably 1 mm or more, and preferably 5 mm or less. When the laminated glass member is a PET film, the thickness of the PET film is preferably 0.03 mm or more, and preferably 0.5 mm or less.

The method for producing the laminated glass is not particularly limited. For example, the intermediate film is sandwiched between the first and second laminated glass members, passed through a pressing roll, or put into a rubber bag and sucked under reduced pressure. Thereby, the air which remains between the 1st laminated glass member and an intermediate film, and the 2nd laminated glass member and an intermediate film is deaerated. Thereafter, it is pre-adhered at about 70 to 110 ° C. to obtain a laminate. Next, the laminate is put in an autoclave or pressed and pressed at about 120 to 150 ° C. and a pressure of 1 to 1.5 MPa. In this way, a laminated glass can be obtained.

The laminated glass can be used for automobiles, railway vehicles, aircraft, ships, buildings, and the like. The laminated glass is preferably laminated glass for buildings or vehicles, and more preferably laminated glass for vehicles. The laminated glass can be used for other purposes. The laminated glass can be used for an automobile windshield, side glass, rear glass, roof glass, or the like. Since the heat shielding property is high and the visible light transmittance is high, the laminated glass is suitably used for automobiles.

The laminated glass is a laminated glass that is a head-up display (HUD). In the laminated glass, measurement information such as speed transmitted from the control unit can be displayed on the windshield from the display unit of the instrument panel. For this reason, the driver | operator of a motor vehicle can visually recognize a front visual field and measurement information simultaneously, without reducing a visual field.

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

In the polyvinyl acetal resin used, n-butyraldehyde having 4 carbon atoms is used for acetalization. Regarding the polyvinyl acetal resin, the degree of acetalization (degree of butyralization), the degree of acetylation, and the hydroxyl group content were measured by a method based on JIS K6728 “Testing methods for polyvinyl butyral”. In addition, when measured by ASTM D1396-92, the same numerical value as the method based on JIS K6728 “Testing method for polyvinyl butyral” was shown.

Preparation of composition (1) for forming an interlayer film:
Triethylene glycol with respect to 100 parts by weight of polyvinyl butyral resin (average polymerization degree of polyvinyl alcohol 1700, hydroxyl group content 30.7 mol%, acetalization degree 68.5 mol%, acetylation degree 0.8 mol%) 40 parts by weight of di-2-ethylhexanoate (3GO) and 2- (2′-hydroxy-3′-t-butyl-5-methylphenyl) -5-chlorobenzotriazole (“Tinvin 326” manufactured by BASF) A composition for adding 0.2 parts by weight and 0.2 parts by weight of BHT (2,6-di-t-butyl-p-cresol) and kneading sufficiently with a mixing roll to form an intermediate film (1) was obtained.

Preparation of composition (1A) for forming an interlayer film:
SG-1505 (anthraquinone compound, “BLUE SG-1505” manufactured by Sumika Color Co., Ltd.), which is a colorant, is added to the composition (1), and the colorant content is 0.025% by weight. (1A) was prepared.

Preparation of composition (1B) for forming an interlayer film:
SG-1505 (anthraquinone compound, “BLUE SG-1505” manufactured by Sumika Color Co., Ltd.) as a colorant is added to the composition (1), and the colorant content is 0.0005% by weight. (1B) was prepared.

Example 1
A display corresponding area of the intermediate film was formed at a position corresponding to the display area of the HUD.

The composition (1) was used in the area around the display corresponding area. The composition (1) and the composition (1A) were used in the shade region. The composition (1A) is disposed in a partial region in the thickness direction of the intermediate film. The composition (1) and the composition (1B) were used in the display corresponding region. The composition (1B) is disposed in a partial region in the thickness direction of the intermediate film.

The composition (1) and the composition are formed in the width direction of the obtained intermediate film by using an extruder having a plurality of resin flow paths in the mold, and the plurality of resin flow paths merge at the mold outlet. (1A) / the composition (1) / the composition (1) and the composition (1B) / the cross section in the thickness direction by extruding them so that the composition (1) is positioned in this order. An intermediate film having a wedge shape was obtained. The obtained intermediate film was wound up in a roll shape.

The obtained intermediate film has a minimum thickness of 800 μm at the other end, a maximum thickness of 1400 μm at one end, and a wedge angle of 0.6 mrad.

The laminate obtained by laminating the obtained interlayer film between two pieces of clear glass (2 mm) was put in a rubber bag, sucked under reduced pressure, and pre-adhered at 100 ° C. The pre-adhered laminate was put in an autoclave and pressure-bonded at 150 ° C. and a pressure of 1.5 MPa to obtain a laminated glass.

In the width direction of the obtained interlayer film, a strip-shaped shade region (visible light transmittance is 10% or less) at the edge on one end side where the thickness is large, and a peripheral region of the display corresponding region (visible light transmittance is 80% or more) ), A band-like display corresponding area corresponding to the display area of the HUD (the visible light transmittance of the display corresponding area is lower than the visible light transmittance of the surrounding area), and the surrounding area of the display corresponding area (the visible light transmittance is 80). % Or more) were positioned in this order. The visible light transmittance of the obtained laminated glass at a wavelength of 380 to 780 nm was measured using a spectrophotometer (“U-4100” manufactured by Hitachi High-Tech) in accordance with JIS R3211 (1998).

In the obtained intermediate film, the display corresponding area and the surrounding area adjacent to the display corresponding area can be visually identified, and the color of the display corresponding area is the color of the surrounding area adjacent to the display corresponding area. Was different.

(Example 2)
A display corresponding area of the intermediate film was formed at a position corresponding to the display area of the HUD.

The composition (1) was used in the area around the display corresponding area. The composition (1) and the composition (1A) were used in the shade region. The composition (1A) is disposed in a partial region in the thickness direction of the intermediate film. The composition (1) was used in the display corresponding region.

The composition (1) and the composition are formed in the width direction of the obtained intermediate film by using an extruder having a plurality of resin flow paths in the mold, and the plurality of resin flow paths merge at the mold outlet. (1A) / A film having a wedge-shaped cross-sectional shape in the thickness direction was obtained by extruding them so that the composition (1) was positioned in this order. On both surfaces of the obtained intermediate film, embossing was performed in the display corresponding region to form a concavo-convex shape in the display corresponding region to obtain an intermediate film. The obtained intermediate film was wound up in a roll shape.

The obtained intermediate film has a minimum thickness of 800 μm at the other end, a maximum thickness of 1200 μm at one end, and a wedge angle of 0.4 mrad.

In the width direction of the obtained interlayer film, a strip-shaped shade region (visible light transmittance is 10% or less) at the edge on one end side where the thickness is large, and a peripheral region of the display corresponding region (visible light transmittance is 80% or more) ), A band-like display corresponding area (visible light transmittance of 80% or more) corresponding to the HUD display area, and a surrounding area (visible light transmittance of 80% or more) of the display corresponding area are positioned in this order. It was.

The laminate obtained by laminating the obtained interlayer film between two pieces of clear glass (2 mm) was put in a rubber bag, sucked under reduced pressure, and pre-adhered at 100 ° C. The pre-adhered laminate was put in an autoclave and pressure-bonded at 150 ° C. and a pressure of 1.5 MPa to obtain a laminated glass.

In the obtained intermediate film, the display corresponding area and the surrounding area adjacent to the display corresponding area can be visually identified, and the glossiness of the display corresponding area is equal to that of the surrounding area adjacent to the display corresponding area. It was different from the glossiness.

(Comparative Example 1)
An intermediate film was obtained in the same manner as in Example 2 except that the embossing was not performed. The obtained intermediate film was wound up in a roll shape.

In the width direction of the obtained intermediate film, a strip-shaped shade region (visible light transmittance is 10% or less) at the edge on the other end side where the thickness is large, and other regions (visible light transmittance is 80% or more) Were in this order. In this intermediate film, a part of another area includes an area where information is preferably displayed (display corresponding area), but the other area as a whole is formed in the same manner.

(Evaluation)
(1) Laminated glass A pair of glass plates was prepared. This glass plate has a predetermined size. In the glass plate before the intermediate film is sandwiched, the portion located in the display area of the HUD is determined, and the display corresponding area of the glass plate is determined.

In Examples 1 and 2, a roll-shaped intermediate film is developed, the display corresponding area of the intermediate film is aligned with the display corresponding area of the pair of glass plates, and the glass plate / intermediate film / glass plate is thermally laminated. 10 sheets of laminated glass were obtained. In Examples 1 and 2, it was easy to align the display corresponding regions of the glass plate and the intermediate film. Note that the alignment of Example 1 was easier than Example 2. In addition, the 10 laminated glasses obtained in Examples 1 and 2 were used as the HUD of the windshield, and display information was reflected from the display unit installed in the lower part to the laminated glass. As a result, no double image was observed, and the measurement information was displayed well.

In Comparative Example 1, ten laminated glasses were obtained by developing a roll-shaped intermediate film and thermally laminating a glass plate / intermediate film / glass plate. In Comparative Example 1, an area where information is preferably displayed (display corresponding area) is included in a part of the other area, but the other area as a whole is formed in the same manner. In Comparative Example 1, it was possible to align the display corresponding area of the intermediate film to some extent with the display corresponding area of the pair of glass plates, but it was difficult to sufficiently align. The ten laminated glasses obtained in Comparative Example 1 were used as the HUD of the windshield, and display information was reflected on the laminated glass from the display unit installed at the bottom. As a result, a double image may be observed, and measurement information may not be displayed well.

DESCRIPTION OF SYMBOLS 1,1A ... 1st layer 1Aa ... The part whose cross-sectional shape of thickness direction is a rectangle 1Ab ... The part whose cross-sectional shape of thickness direction is wedge shape 2 ... 2nd layer 3 ... 3rd layer 11, 11A ... Intermediate film DESCRIPTION OF SYMBOLS 11a ... One end 11b ... Other end 11Aa ... The part whose cross-sectional shape of thickness direction is a rectangle 11Ab ... The part whose cross-sectional shape of thickness direction is wedge shape 21 ... Laminated glass 22 ... 1st laminated glass member 23 ... 2nd laminated glass Member R1 ... Display corresponding area R2 ... Surrounding area R3 ... Shade area

Claims (11)

1. An interlayer film for laminated glass used for laminated glass which is a head-up display,
   Including thermoplastics,
   Having one end and the other end having a thickness larger than the one end on the side opposite to the one end,
   Has a display corresponding area corresponding to the display area of the head-up display,
   The display corresponding area and the surrounding area adjacent to the display corresponding area can be visually identified, or the color or glossiness of the display corresponding area is equal to that of the surrounding area adjacent to the display corresponding area. An interlayer film for laminated glass that has a different color or gloss.
2. The interlayer film for laminated glass according to claim 1, wherein a color or glossiness of the display corresponding area is different from a color or glossiness of a surrounding area adjacent to the display corresponding area.
3. The interlayer film for laminated glass according to claim 2, wherein a color of the display corresponding area is different from a color of an area adjacent to the display corresponding area.
4. The interlayer film for laminated glass according to any one of claims 1 to 3, wherein a thickness of the display corresponding region changes from the one end to the other end.
5. The interlayer film for laminated glass according to any one of claims 1 to 4, which has a portion having a wedge-shaped cross-sectional shape in the thickness direction.
6. The display corresponding region has a length direction and a width direction;
   The interlayer film for laminated glass according to any one of claims 1 to 5, wherein a width direction of the display corresponding region is a direction connecting the one end and the other end.
7. The interlayer film for laminated glass according to any one of claims 1 to 6, wherein a visible light transmittance of the display corresponding region is 80% or more.
8. The interlayer film for laminated glass according to any one of claims 1 to 7, further comprising a shade region apart from the display corresponding region.
9. The interlayer film for laminated glass according to any one of claims 1 to 8, wherein the thermoplastic resin is a polyvinyl acetal resin.
10. The interlayer film for laminated glass according to any one of claims 1 to 9, comprising a plasticizer.
11. A first laminated glass member;
    A second laminated glass member;
    An interlayer film for laminated glass according to any one of claims 1 to 10,
    Laminated glass in which the interlayer film for laminated glass is disposed between the first laminated glass member and the second laminated glass member.

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