JP6613094B2 - Laminated glass interlayer film and laminated glass - Google Patents

Description

  The present invention relates to an interlayer film for laminated glass and a method for producing 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.

  In general, laminated glass is excellent in safety because the amount of glass fragments scattered is small even if it is damaged by an external impact. 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 two glass plates.

  Examples of the interlayer film for laminated glass include a single-layer interlayer film having a single-layer structure and a multilayer interlayer film having a structure of two or more layers.

  As an example of the interlayer film for laminated glass, the following Patent Document 1 discloses that 100 parts by weight of a polyvinyl acetal resin having an acetalization degree of 60 to 85 mol%, and at least one of an alkali metal salt and an alkaline earth metal salt. A sound insulation layer containing 0.001 to 1.0 parts by weight of a metal salt of and a plasticizer exceeding 30 parts by weight is disclosed. This sound insulation layer may be a single layer and used as an intermediate film.

  Further, Patent Document 1 listed below also describes a multilayer intermediate film in which the sound insulation layer and other layers are laminated. The other layer laminated on the sound insulation layer is composed of 100 parts by weight of a polyvinyl acetal resin having an acetalization degree of 60 to 85 mol%, and at least one metal salt of an alkali metal salt and an alkaline earth metal salt 0.001 to 0.001. 1.0 part by weight and a plasticizer that is 30 parts by weight or less are included.

  In Patent Document 1, as alkali metal salts and alkaline earth metal salts, salts of K, Na, and Mg are mentioned.

  Patent Document 1 below discloses an intermediate film formed from a resin composition containing a polyvinyl acetal resin, a plasticizer, a metal salt of a carboxylic acid, and an organic acid.

  In Patent Document 2, Mg, Ca and Zn salts are mentioned as metal salts of carboxylic acid.

JP 2007-070200 A JP-A-5-186250

  In the laminated glass, if the adhesive force between the interlayer film and the glass plate is too low, the laminated glass is easily damaged by an external impact, and glass fragments are likely to be scattered. If the adhesive force between the intermediate film and the glass plate is too high, the intermediate film and the glass plate are easily broken at the same time. Therefore, in order to increase the safety of the laminated glass, it is necessary to adjust the adhesive force between the interlayer film and the glass plate within a certain range. In laminated glass used in automobiles, adjusting the adhesive force between the interlayer film and the glass plate to a certain range is to absorb the impact when the occupant and article collide with the laminated glass in the event of an automobile accident, It plays a major role in preventing passengers and articles from penetrating the laminated glass. In addition, with laminated glass used in buildings, adjusting the adhesive strength between the interlayer film and the glass plate within a certain range makes it difficult for glass fragments to fly even if the laminated glass breaks due to flying objects from the outside. Or it plays a big role in preventing flying objects from the outside from penetrating the laminated glass.

  In order to adjust the adhesive force between the intermediate film and the glass plate, in Patent Documents 1 and 2, an adhesive force adjusting agent is used.

  However, even when a laminated glass is produced using a conventional adhesive strength modifier, it may be difficult to control the adhesive strength between the intermediate film and the glass plate.

  The objective of this invention is providing the manufacturing method of the intermediate film for laminated glasses which can make the adhesive force of an intermediate film and a laminated glass member effectively favorable in laminated glass, and the intermediate film for laminated glasses. . 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 having a single-layer structure or a two-layer structure, wherein the surface layer in the intermediate film includes a thermoplastic resin, a plasticizer, and a metal element. There is provided an interlayer film for laminated glass, wherein the first layer is a first layer having a contact angle measured by a droplet method using water of less than 73 °. .

  On the specific situation with the intermediate film for laminated glasses which concerns on this invention, content of the said metal element in a said 1st layer is 20 ppm or more and 200 ppm or less.

  In a specific aspect of the interlayer film for laminated glass according to the present invention, the first layer contains the metal element due to the addition of an alkali metal salt and an alkaline earth metal salt.

  In a specific aspect of the interlayer film for laminated glass according to the present invention, the metal element is a polyvalent metal element.

  In a specific aspect of the interlayer film for laminated glass according to the present invention, the first layer contains the metal element due to the addition of magnesium acetate or magnesium 2-ethylbutyrate.

  In a specific aspect of the interlayer film for laminated glass according to the present invention, the interlayer film for laminated glass has a structure of two or more layers, and includes a thermoplastic resin and a plasticizer as a surface layer in the interlayer film. The second layer is disposed on the first surface side of the first layer.

  In a specific aspect of the interlayer film for laminated glass according to the present invention, the second layer contains a metal element, and the second layer has a contact angle measured by a droplet method using water of 73 °. It is the 2nd layer which shows the value which is less than.

  In a specific aspect of the interlayer film for laminated glass according to the present invention, the interlayer film for laminated glass has a structure of three or more layers, and further includes a third layer containing a thermoplastic resin and a plasticizer. The third layer is disposed between the first layer and the second layer.

  In a specific aspect of the interlayer film for laminated glass according to the present invention, the interlayer film for laminated glass has a single-layer structure and includes only the first layer.

  It is preferable that the thermoplastic resin contained in the first layer is a polyvinyl acetal resin. It is preferable that the thermoplastic resin contained in the second layer is a polyvinyl acetal resin. It is preferable that the thermoplastic resin contained in the third layer is a polyvinyl acetal resin.

  According to a wide aspect of the present invention, there is provided a method for producing an interlayer film for laminated glass as described above, wherein by using a vent type extruder, extrusion molding is performed under the condition that the gauge pressure of the vacuum vent is 500 mmHg or more. There is provided a method for producing an interlayer film for laminated glass, comprising a step of obtaining a first layer.

  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 has a structure of one layer or two or more layers, and includes a first layer containing a thermoplastic resin, a plasticizer, and a metal element as a surface layer in the interlayer film. Since the first layer is a first layer having a contact angle measured by a droplet method using water of less than 73 °, the laminated layer using the interlayer film for laminated glass according to the present invention is used. In glass, the adhesive force between the interlayer film and the laminated glass member can be effectively improved.

FIG. 1 is a cross-sectional view schematically showing an interlayer film for laminated glass according to the first embodiment of the present invention. FIG. 2 is a cross-sectional 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 schematically showing an example of a laminated glass using the laminated glass interlayer film shown in FIG. FIG. 4 is a cross-sectional view schematically showing an example of a laminated glass using the laminated glass interlayer film shown in FIG.

  Hereinafter, the present invention will be described in detail.

  The interlayer film for laminated glass according to the present invention (sometimes abbreviated as “intermediate film” in the present specification) has a single-layer structure or a two-layer structure. The intermediate film according to the present invention may have a single-layer structure, may have a structure of two or more layers, or may have a structure of three or more layers. The intermediate film according to the present invention includes a first layer containing a thermoplastic resin, a plasticizer, and a metal element. The intermediate film according to the present invention may be a single-layer intermediate film including only the first layer, or may be a multilayer intermediate film including the first layer and another layer. The intermediate film according to the present invention includes the first layer as a surface layer in the intermediate film.

  In the intermediate film according to the present invention, the first layer is a first layer showing a value at which a contact angle measured by a droplet method using water is less than 73 °.

  Since the interlayer film according to the present invention has the above-described configuration, in the laminated glass using the interlayer film according to the present invention, the adhesive force between the interlayer film and the laminated glass member can be effectively improved. it can. As a result of improving the adhesive force between the interlayer film and the laminated glass member, the penetration resistance of the laminated glass can be enhanced. In order to effectively enhance the penetration resistance of the laminated glass, in addition to including a metal element in the first layer, the contact angle in the first layer should satisfy the above range. Was found by the present inventors.

  Furthermore, since the intermediate film according to the present invention has the above-described configuration, the first layer particularly has a value at which a contact angle measured by a droplet method using water is less than 73 °. Since it is 1 layer, the value of immersion haze can also be made small. When the value of the immersion haze is small, the moisture resistance is increased. The inventors have found that the contact angle measured by the droplet method using the first layer of water is related to the value of immersion haze.

  From the viewpoint of more effectively improving the adhesive force between the interlayer film and the laminated glass member, contact measured by the droplet method using water in each of the interlayer film, the first layer, and the second layer. The angle is preferably 72.9 ° or less, more preferably 72.6 ° or less, still more preferably 72.3 ° or less, particularly preferably 72.0 ° or less, and most preferably 71.7 ° or less. In each of the intermediate film, the first layer, and the second layer, the lower limit of the contact angle measured by the droplet method using water is not particularly limited, but the contact angle is preferably 61.0 ° or more, more It is preferably 61.5 ° or more, more preferably 62.0 ° or more, particularly preferably 62.5 ° or more, and most preferably 63.0 ° or more.

  The contact angle is measured at the outer surface of the surface layer. As a measuring device, “DropMaster 500” manufactured by Kyowa Interface Science Co., Ltd. can be used. Moreover, the said contact angle is specifically measured as follows.

  (Measurement environment) Temperature 23 ° C, relative humidity 50%

  (Measurement method) Water is collected in a syringe, and a 1.0 μL droplet is prepared at the needle tip. When a polyethylene terephthalate (PET) film or the like is bonded to the intermediate film, the PET film is peeled off. The produced droplet is brought into contact with the intermediate film to form a droplet on the intermediate film. One second after the droplet is formed on the intermediate film, an image of the droplet is taken. By analyzing the image of the droplet, the contact angle is calculated by the θ / 2 method. The average value of 10 measurements is taken as the contact angle. The intermediate film is held in a measurement environment for 24 hours before measurement.

  In the present invention, not the surface shape of the surface layer and the intermediate film, but the contact angle as an index indicating the properties of the substances themselves constituting the surface layer and the intermediate layer (combination of contained components, presence state of contained components, etc.) Is defined. For this reason, when measuring the contact angle of the layer for measuring the contact angle or the intermediate film, it is preferable to measure the surface layer and the surface of the intermediate film in a smooth state.

  When the layer or intermediate film for measuring the contact angle has irregularities on the surface by embossing, the transparent float glass, the polyethylene terephthalate (PET) film, the layer or intermediate film for measuring the contact angle, and polyethylene terephthalate ( After the PET) film and the transparent float glass were laminated in this order, the obtained laminate was heated to 70 ° C. in a heating oven and passed through a nip roll (roll pressure 0.44 MPa, linear velocity 1 m / min). Thereafter, it is preferable to further perform autoclaving (kept at 135 ° C. and pressure of 1.2 MPa for 20 minutes), peel off the transparent float glass and the PET film, and obtain the contact angle.

  The intermediate film may have a structure of two or more layers, and may include a second layer in addition to the first layer. The intermediate film preferably includes a second layer as a surface layer in the intermediate film. The intermediate film preferably includes a second layer containing a thermoplastic resin and a plasticizer as a surface layer in the intermediate film. Preferably, the first layer is a surface layer on one side of the intermediate layer, and the second layer is a surface layer on the other side of the intermediate layer. When the intermediate film includes the second layer, the first layer is disposed on the first surface side of the second layer. In this case, the first layer and the second layer may be directly laminated, and another layer (a third layer to be described later) is provided between the first layer and the second layer. Etc.) may be arranged.

  The intermediate film may have a structure of three or more layers, and may include a third layer in addition to the first layer and the second layer. The intermediate film preferably includes a third layer containing a thermoplastic resin and a plasticizer. When the intermediate film includes the third layer, the third layer is disposed between the first layer and the second layer. In this case, the first layer and the third layer may be directly laminated, or another layer may be disposed between the first layer and the third layer. . The second layer and the third layer may be directly laminated, or another layer may be disposed between the second layer and the third layer.

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

  In FIG. 1, the intermediate film for laminated glasses which concerns on the 1st Embodiment of this invention is typically shown with sectional drawing.

  The intermediate film 11 shown in FIG. 1 is a multilayer intermediate film having a structure of two or more layers. 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 includes a first layer 1, a second layer 2, and a third layer 3. On the first surface 3a of the third layer 3, the first layer 1 is disposed and laminated. The second layer 2 is disposed on the second surface 3b opposite to the first surface 3a of the third layer 3 and laminated. A third layer 3 is disposed between the first layer 1 and the second layer 2 and sandwiched therebetween. The third layer 3 is an intermediate layer. On the first surface 1b side of the first layer 1, the third layer 3 and the second layer 2 are arranged in this order. Each of the first layer 1 and the second layer 2 is a protective layer, and is a surface layer in the present embodiment. Therefore, the intermediate film 11 has a multilayer structure (first layer 1 / third layer 3 / second layer) in which the first layer 1, the third layer 3, and the second layer 2 are laminated in this order. Having layer 2).

  Other layers may be arranged between the first layer 1 and the third layer 3 and between the third layer 3 and the second layer 2, respectively. The first layer 1 and the third layer 3, and the third layer 3 and the second layer 2 are preferably laminated directly. Examples of other layers include layers containing polyethylene terephthalate and the like.

  The first layer 1 includes a thermoplastic resin, a plasticizer, and a metal element. The second layer 2 preferably contains a thermoplastic resin, and preferably contains a plasticizer. The first layer 1 is a first layer that exhibits a value that a contact angle measured by a droplet method using water is less than 73 °. The second layer 2 preferably contains a metal element. The second layer 2 is preferably a second layer showing a value that a contact angle measured by a droplet method using water is less than 73 °. The third layer 3 preferably contains a thermoplastic resin, and preferably contains a plasticizer.

  In FIG. 2, the intermediate film for laminated glasses which concerns on the 2nd Embodiment of this invention is typically shown with sectional drawing.

  An intermediate film 11A shown in FIG. 2 is a single-layer intermediate film having a single-layer structure. The intermediate film 11A is a first layer. 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 (first layer) includes a thermoplastic resin, a plasticizer, and a metal element. The intermediate film 11A (first layer) is an intermediate film (first layer) showing a value that a contact angle measured by a droplet method using water is less than 73 °.

  Hereinafter, the first layer (including a single-layer intermediate film) constituting the intermediate film according to the present invention, the details of the second layer and the third layer, the first layer, the second layer, and the like. Details of each component contained in the layer and the third layer will be described.

(Polyvinyl acetal resin or thermoplastic resin)
The first layer (including a single-layer intermediate film) preferably includes a thermoplastic resin (hereinafter sometimes referred to as a thermoplastic resin (1)), and the thermoplastic resin (1) includes polyvinyl. It preferably contains an acetal resin (hereinafter sometimes referred to as polyvinyl acetal resin (1)). The second layer preferably contains a thermoplastic resin (hereinafter sometimes referred to as a thermoplastic resin (2)), and a polyvinyl acetal resin (hereinafter referred to as a polyvinyl acetal resin (2) as the thermoplastic resin (2). )) May be included. The third layer preferably contains a thermoplastic resin (hereinafter sometimes referred to as a thermoplastic resin (3)), and as the thermoplastic resin (3), a polyvinyl acetal resin (hereinafter referred to as a polyvinyl acetal resin ( 3)) may be included. The thermoplastic resin (1), the thermoplastic resin (2), and the thermoplastic resin (3) may be the same or different. As for the said thermoplastic resin (1), the said thermoplastic resin (2), and the said thermoplastic resin (3), only 1 type may respectively be used and 2 or more types may be used together. The polyvinyl acetal resin (1), the polyvinyl acetal resin (2), and the polyvinyl acetal resin (3) may be the same or different. As for the said polyvinyl acetal resin (1), the said polyvinyl acetal resin (2), and the said polyvinyl acetal resin (3), only 1 type may respectively 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 polyvinyl acetal resin can be produced, for example, by acetalizing polyvinyl alcohol with an aldehyde. The polyvinyl acetal resin is preferably an acetalized product of polyvinyl alcohol. The polyvinyl alcohol can be obtained, for example, by saponifying polyvinyl acetate. The saponification degree of the polyvinyl alcohol is generally 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 number of carbon atoms 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 number of carbon atoms of the acetal group in the polyvinyl acetal resin is preferably 3 to 5, and more 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, an aldehyde having 1 to 10 carbon atoms is preferably used as the aldehyde. Examples of the aldehyde having 1 to 10 carbon atoms include formaldehyde, acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexylaldehyde, n-octylaldehyde, Examples include n-nonyl aldehyde, n-decyl aldehyde, and benzaldehyde. Of these, propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexylaldehyde or n-valeraldehyde is preferable, propionaldehyde, n-butyraldehyde or isobutyraldehyde is more preferable, and n-butyraldehyde is still more preferable. As for the said aldehyde, only 1 type may be used and 2 or more types may be used together.

  The content of each hydroxyl group in the polyvinyl acetal resin (1) and the polyvinyl acetal resin (2) is preferably 25 mol% or more, more preferably 28 mol% or more, still more preferably 29 mol% or more, preferably 35 mol. % Or less, more preferably 32 mol% or less, particularly preferably 31 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 (hydroxyl group amount) of the polyvinyl acetal resin (3) is preferably 17 mol% or more, more preferably 20 mol% or more, still more preferably 22 mol% or more, preferably 30 mol% or less, more preferably. Is less than 27 mol%, more preferably 25 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. In particular, when the hydroxyl group content of the polyvinyl acetal resin (3) is 20 mol% or more, the reaction efficiency is high and the productivity is excellent, and when it is less than 27 mol%, the sound insulation of the laminated glass is further enhanced. . 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 by measuring, for example, according to JIS K6728 “Testing method for polyvinyl butyral”.

  Each degree of acetylation of the polyvinyl acetal resin (1) and the polyvinyl acetal resin (2) is preferably 0.01 mol% or more, more preferably 0.5 mol% or more, preferably 10 mol% or less, more preferably. Is 2 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 (acetyl group amount) of the polyvinyl acetal resin (3) is preferably 0.01 mol% or more, more preferably 0.1 mol% or more, still more preferably 7 mol% or more, and still more preferably 9 It is at least mol%, preferably at most 30 mol%, more preferably at most 25 mol%, still more preferably at most 15 mol%. 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. In particular, when the polyvinyl acetal resin (3) has an acetylation degree of 0.1 mol% or more and 25 mol% or less, the penetration resistance is excellent.

  The degree of acetylation is a value indicating the mole fraction obtained by dividing the amount of ethylene groups to which acetyl groups are bonded by the total amount of ethylene groups in the main chain, as a percentage. The amount of ethylene group to which the acetyl group is bonded can be measured, for example, according to JIS K6728 “Testing method for polyvinyl butyral”.

  The degree of acetalization (degree of butyralization in the case of polyvinyl butyral resin) of the polyvinyl acetal resin (1) and the polyvinyl acetal resin (2) is preferably 55 mol% or more, more preferably 67 mol% or more, preferably Is 75 mol% or less, more preferably 71 mol% or less. 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 degree of acetalization of the polyvinyl acetal resin (3) (in the case of polyvinyl butyral resin, the degree of butyralization) is preferably 47 mol% or more, more preferably 60 mol% or more, preferably 80 mol% or less, more preferably It is 70 mol% or less. 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 degree of acetalization is the value obtained by subtracting the amount of ethylene groups to which acetyl 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 degree of acetalization can be calculated by a method based on JIS K6728 “Testing method for polyvinyl butyral”.

  The hydroxyl group content (hydroxyl group amount), acetalization degree (butyralization degree), and acetylation degree are preferably calculated from results measured by a method based on JIS K6728 “Testing methods for polyvinyl butyral”. However, you may use the measurement by ASTM D1396-92. When the polyvinyl acetal resin is a polyvinyl butyral resin, the hydroxyl group content (hydroxyl content), the acetalization degree (butyralization degree), and the acetylation degree are determined in accordance with JIS K6728 “Testing methods for polyvinyl butyral”. It can be calculated from the results measured by

  From the viewpoint of further improving the penetration resistance of the laminated glass, the polyvinyl acetal resin (3) has an acetylation degree (a) of 8 mol% or less and an acetalization degree (a) of 66 mol%. The polyvinyl acetal resin (A) as described above is preferable, or the polyvinyl acetal resin (B) having a degree of acetylation (b) exceeding 8 mol% is preferable. The polyvinyl acetal resin (3) may be the polyvinyl acetal resin (A) or the polyvinyl acetal resin (B).

  The degree of acetylation (a) of the polyvinyl acetal resin (A) is 8 mol% or less, preferably 7.5 mol% or less, more preferably 7 mol% or less, still more preferably 6.5 mol% or less, particularly preferably. It is 5 mol% or less, preferably 0.1 mol% or more, more preferably 0.5 mol% or more, still more preferably 0.8 mol% or more, and particularly preferably 1 mol% or more. When the degree of acetylation (a) is not more than the above upper limit and not less than the above lower limit, the migration of the plasticizer can be easily controlled, and the sound insulation of the laminated glass is further enhanced.

  The degree of acetalization (a) of the polyvinyl acetal resin (A) is 66 mol% or more, preferably 70 mol% or more, more preferably 70.5 mol% or more, still more preferably 71 mol% or more, and particularly preferably 71. 5 mol% or more, most preferably 72 mol% or more, preferably 85 mol% or less, more preferably 83 mol% or less, still more preferably 81 mol% or less, particularly preferably 79 mol% or less. When the acetalization degree (a) is not less than the above lower limit, the sound insulating properties of the laminated glass are further enhanced. The reaction time required in order to manufacture polyvinyl acetal resin (A) as the said acetalization degree (a) is below the said upper limit can be shortened.

  The hydroxyl group content (a) of the polyvinyl acetal resin (A) is preferably 18 mol% or more, more preferably 19 mol% or more, still more preferably 20 mol% or more, particularly preferably 21 mol% or more, preferably 31. The mol% or less, more preferably 30 mol% or less, still more preferably 29 mol% or less, and particularly preferably 28 mol% or less. When the hydroxyl group content (a) is not less than the above lower limit, the adhesion of the third layer is further increased. When the hydroxyl group content (a) is not more than the above upper limit, the sound insulation of the laminated glass is further enhanced.

  The degree of acetylation (b) of the polyvinyl acetal resin (B) exceeds 8 mol%, preferably 9 mol% or more, more preferably 9.5 mol% or more, still more preferably 10 mol% or more, particularly preferably. 10.5 mol% or more, preferably 30 mol% or less, more preferably 28 mol% or less, still more preferably 26 mol% or less, and particularly preferably 24 mol% or less. When the acetylation degree (b) is not less than the above lower limit, the sound insulation of the laminated glass is further enhanced. The reaction time required in order to manufacture polyvinyl acetal resin (B) as the said acetylation degree (b) is below the said upper limit can be shortened.

  The degree of acetalization (b) of the polyvinyl acetal resin (B) is preferably 50 mol% or more, more preferably 53 mol% or more, still more preferably 55 mol% or more, particularly preferably 60 mol% or more, preferably 80 mol%. % Or less, more preferably 78 mol% or less, still more preferably 76 mol% or less, and particularly preferably 74 mol% or less. When the acetalization degree (b) is not less than the above lower limit, the sound insulating properties of the laminated glass are further enhanced. The reaction time required in order to manufacture polyvinyl acetal resin (B) as the said acetalization degree (b) is below the said upper limit can be shortened.

  The content (b) of the hydroxyl group in the polyvinyl acetal resin (B) is preferably 18 mol% or more, more preferably 19 mol% or more, still more preferably 20 mol% or more, particularly preferably 21 mol% or more, preferably 31. The mol% or less, more preferably 30 mol% or less, still more preferably 29 mol% or less, and particularly preferably 28 mol% or less. When the hydroxyl group content (b) is equal to or higher than the lower limit, the adhesive strength of the third layer is further increased. When the hydroxyl group content (b) is not more than the above upper limit, the sound insulating properties of the laminated glass are further enhanced.

  The polyvinyl acetal resin (1), the polyvinyl acetal resin (2), and the polyvinyl acetal resin (3) are each preferably a polyvinyl butyral resin. The polyvinyl acetal resin (A) and the polyvinyl acetal resin (B) are each preferably a polyvinyl butyral resin.

(Plasticizer)
The first layer (including a single-layer interlayer film) includes a plasticizer (hereinafter sometimes referred to as a plasticizer (1)). The second layer preferably contains a plasticizer (hereinafter sometimes referred to as a plasticizer (2)). The third layer preferably contains a plasticizer (hereinafter may be referred to as a plasticizer (3)). By the combined use of the polyvinyl acetal resin and the plasticizer, the adhesive strength of the layer containing the polyvinyl acetal resin and the plasticizer to the laminated glass member or another layer is appropriately increased. The plasticizer is not particularly limited. The plasticizer (1), the plasticizer (2), and the plasticizer (3) may be the same or different. 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 phosphoric acid plasticizers and organic phosphorous acid plasticizers. . Of these, organic ester plasticizers are preferred. The plasticizer is preferably a liquid plasticizer.

  Examples of the monobasic organic acid ester include glycol esters obtained by reaction of glycol with a monobasic organic acid. 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.

  Examples of the polybasic organic acid ester include ester compounds 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.

  Examples of the organic ester plasticizer include triethylene glycol di-2-ethylpropanoate, 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-ethylbutyrate, 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 Xanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylpentanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprylate, dihexyl adipate, dioctyl adipate, adipine Hexyl cyclohexyl, a mixture of heptyl adipate and nonyl adipate, diisononyl adipate, diisodecyl adipate, heptylnonyl adipate, dibutyl sebacate, oil-modified alkyd sebacate, and a mixture of phosphate ester and adipate Can be mentioned. Organic ester plasticizers other than these may be used. Other adipic acid esters other than the above-mentioned adipic acid esters may be used.

  Examples of the organic phosphate plasticizer 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 represent an organic group having 2 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 formula (1) are each preferably an organic group having 5 to 10 carbon atoms, and more preferably an organic group having 6 to 10 carbon atoms.

  The plasticizer preferably contains triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH) or triethylene glycol di-2-ethylpropanoate. , Triethylene glycol di-2-ethylhexanoate or triethylene glycol di-2-ethylbutyrate is more preferable, and triethylene glycol di-2-ethylhexanoate is still more preferable.

(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, anthracyanine, an anthracocyanine derivative, and the like. 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. Among these, metal oxide particles are preferable because of their high heat ray shielding function, ATO particles, GZO particles, IZO particles, ITO particles or tungsten oxide particles are more preferable, and ITO particles or tungsten oxide particles are particularly preferable. 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.

  The tungsten oxide particles are generally represented by the following formula (X1) or the following formula (X2). In the intermediate film, tungsten oxide particles represented by the following formula (X1) or the following formula (X2) are preferably used.

W _y O _z Formula (X1)

  In the above formula (X1), W represents tungsten, O represents oxygen, and y and z satisfy 2.0 <z / y <3.0.

M _x W _y O _z Formula (X2)

  In the above formula (X2), M is H, He, alkali metal, alkaline earth metal, rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu , Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta And at least one element selected from the group consisting of Re, W represents tungsten, O represents oxygen, and x, y, and z represent 0.001 ≦ x / y ≦ 1, and 2.0 <z / y ≦ 3.0 is satisfied.

  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 “average particle diameter” indicates a volume average particle diameter. The average particle diameter can be measured using a particle size distribution measuring apparatus (“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), the content of the heat shielding particles is preferably 0.01% by weight or more, more preferably 0%. 0.1% by weight or more, 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, still more preferably 4% by weight or less, Preferably it is 3.5 weight% or less, Most preferably, it is 3.0 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.

The layer (the first layer, the second layer, or the third layer) containing the heat shielding particles may contain the heat shielding particles at a ratio of 0.1 g / m ² or more and 12 g / m ² or less. preferable. When the ratio of the heat shielding particles is within the above range, the heat shielding property is sufficiently high and the visible light transmittance is sufficiently high. The proportion of the heat shielding particles is preferably 0.5 g / m ² or more, more preferably 0.8 g / m ² or more, still more preferably 1.5 g / m ² or more, particularly preferably 3 g / m ² or more, preferably Is 11 g / m ² or less, more preferably 10 g / m ² or less, still more preferably 9 g / m ² or less, and particularly preferably 7 g / m ² or less. When the ratio is equal to or higher than the lower limit, the heat shielding property is further enhanced. When the ratio is less than or equal to the upper limit, the visible light transmittance is further increased.

(Metal element)
The intermediate film includes a metal element. The first layer includes a metal element. The second layer preferably contains a metal element. Each of the intermediate film, the first layer, and the second layer preferably includes the metal element derived from the addition of a metal salt. By using the metal salt, the adhesive force between the interlayer film and the laminated glass member can be improved, and the penetration resistance of the laminated glass can be effectively enhanced. As for the said metal element, only 1 type may be used and 2 or more types may be used together.

  The metal salt is preferably an alkali metal salt or an alkaline earth metal salt. In this case, only one of the alkali metal salt and the alkaline earth metal salt may be used, or both of them may be used. The alkaline earth metal salt includes a magnesium salt.

  The metal salt 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 magnesium carboxylate having 2 to 16 carbon atoms or More preferably, it is a carboxylic acid potassium salt having 2 to 16 carbon atoms.

  Although it does not specifically limit as said C2-C16 carboxylic acid magnesium salt and said C2-C16 carboxylic acid potassium salt, 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.

  From the viewpoint of more effectively improving the adhesive force between the interlayer film and the laminated glass member, the metal element is preferably a polyvalent metal element. From the viewpoint of more effectively improving the adhesion between the interlayer film and the laminated glass member, the interlayer film, the first layer, and the second layer are each derived from the addition of an alkaline earth metal salt. And it is preferable that the said metal element is included.

  From the viewpoint of more effectively improving the adhesive force between the interlayer film and the laminated glass member, the interlayer film, the first layer, and the second layer are each made of magnesium acetate or magnesium 2-ethylbutyrate. It is preferable that the metal element is contained due to the addition. In this case, only one of magnesium acetate and magnesium 2-ethylbutyrate may be used, or both may be used. From the viewpoint of more effectively improving the adhesive force between the interlayer film and the laminated glass member, it is preferable to use both magnesium acetate and magnesium 2-ethylbutyrate.

  From the viewpoint of more effectively improving the adhesive force between the interlayer film and the laminated glass member, the metal element particularly preferably contains Mg, and most preferably Mg.

  The total content of the metal elements and the total content of Mg in the layer containing the metal element (first layer, second layer or third layer) are preferably 5 ppm or more, more preferably 10 ppm or more. More preferably, it is 20 ppm or more, preferably 300 ppm or less, more preferably 250 ppm or less, still more preferably 200 ppm or less, and particularly preferably 100 ppm or less. When the total content of the above metal elements 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 each layer in the interlayer film can be controlled even better, and the resistance of the laminated glass The penetrability can be effectively increased.

  The Mg content in the metal element-containing layer (first layer, second layer or third layer) is preferably 5 ppm or more, more preferably 10 ppm or more, still more preferably 20 ppm or more, preferably 300 ppm or less. More preferably, it is 250 ppm or less, More preferably, it is 200 ppm or less, Most preferably, it is 100 ppm or less. When the total amount of Mg 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 each layer in the interlayer film can be controlled even more effectively, and the penetration resistance of the laminated glass is effective Can be increased.

  The K content in the metal element-containing layer (first layer, second layer, or third layer) is preferably 30 ppm or less, more preferably 20 ppm or less, still more preferably 10 ppm or less, and particularly preferably 5 ppm. It is as follows. When the K content is not more than the above upper limit, the adhesiveness between the interlayer film and the laminated glass member can be controlled even better even if the moisture content of the interlayer film is high.

(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 a metal ultraviolet shielding agent, a metal oxide ultraviolet shielding agent, a benzotriazole ultraviolet shielding agent (benzotriazole compound), a benzophenone ultraviolet shielding agent (benzophenone compound), and a triazine ultraviolet shielding agent. (Triazine compound), malonic acid ester ultraviolet shielding agent (malonic acid ester compound), oxalic acid anilide ultraviolet shielding agent (oxalic acid anilide compound), benzoate ultraviolet shielding agent (benzoate compound) and the like.

  Examples of the metallic ultraviolet shielding agent 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 preferably, it is a benzotriazole ultraviolet shielding agent.

  Examples of the metal oxide ultraviolet shielding agent include zinc oxide, titanium oxide, and cerium oxide. Furthermore, the surface of the metal oxide ultraviolet shielding agent may be coated. Examples of the coating material on the surface of the metal oxide ultraviolet shielding agent 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-based ultraviolet shielding agent 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 " Tinuvin 326 "), 2- (2'-hydroxy-3 ', 5'-di-amylphenyl) benzotriazole (" Tinvin 328 "manufactured by BASF) and the like. The ultraviolet shielding agent is preferably a benzotriazole-based ultraviolet shielding agent containing a halogen atom, more preferably a benzotriazole-based ultraviolet shielding agent containing a chlorine atom, because of its excellent performance of absorbing ultraviolet rays.

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

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

  As a commercial item of the said malonic acid ester type | system | group ultraviolet shielding agent, Hostavin B-CAP, Hostavin PR-25, and Hostavin PR-31 (all are the Clariant company make) are mentioned.

  Examples of the oxalic acid anilide-based ultraviolet shielding agent include N- (2-ethylphenyl) -N ′-(2-ethoxy-5-t-butylphenyl) oxalic acid diamide, N- (2-ethylphenyl) -N ′. Oxalic acid diamides having an aryl group substituted on a 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-based ultraviolet shielding agent include 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate (“Tinvin 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 is preferably 0.1% by weight or more, more preferably 0.2% by weight or more, further preferably 0.3% by weight or more, particularly preferably 0.5% by weight or more, 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, and 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-tert-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-hydro) Loxy-5-t-butylphenol) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, bis (3,3′- and t-butylphenol) butyric acid glycol ester and bis (3-t-butyl-4-hydroxy-5-methylbenzenepropanoic acid) ethylene bis (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 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 "and the like.

  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.

(Other details of interlayer film for laminated glass)
The thickness of the interlayer film for laminated glass according to the present invention is not particularly limited. From the viewpoint of practical use and from the viewpoint of sufficiently increasing the heat shielding property, the thickness of the intermediate film is preferably 0.1 mm or more, more preferably 0.25 mm or more, preferably 3 mm or less, more preferably 1.5 mm or less. is there. When the thickness of the intermediate film is not less than the above lower limit, the penetration resistance of the laminated glass is increased.

  The ratio of each thickness (μm) of the first layer and the second layer to the thickness of the entire intermediate film (μm) is preferably 0.1 or more, more preferably 0.2 or more, preferably 0.9 or less. More preferably, it is 0.7 or less, and still more preferably 0.5 or less. That is, when the thickness of the interlayer film for laminated glass is T (μm), each thickness of the first layer and the second layer is preferably 0.1 T or more, more preferably 0.2 T or more. Preferably it is 0.9T or less, More preferably, it is 0.7T or less, More preferably, it is 0.5T or less. When the thickness of each of the first layer and the second layer is equal to or greater than the lower limit, the adhesion between the layers and the adhesion between the interlayer film and the laminated glass member are likely to be good. When the intermediate film has a three-layer structure of the first layer, the second layer, and the third layer, the total thickness of the first layer and the second layer (μm) of the entire intermediate film The ratio to the thickness (μm) is preferably 0.5 or more, more preferably 0.6 or more, preferably 0.95 or less, more preferably 0.9 or less. When the thickness ratio is less than or equal to the above upper limit, the thickness of the laminated glass becomes thin, and the handleability of the interlayer film and the laminated glass is further enhanced.

  The method for producing the interlayer film according to the present invention is not particularly limited. Examples of the method for producing an interlayer film according to the present invention include a method of extruding a resin composition using an extruder in the case of a single-layer interlayer film. As a method for producing an intermediate film according to the present invention, in the case of a multilayer intermediate film, for example, a method of laminating each obtained layer after forming each layer using each resin composition for forming each layer In addition, a method of laminating each layer by coextruding each resin composition for forming each layer using an extruder may be used. Since it is suitable for continuous production, an extrusion method is preferred.

  The intermediate film, the first layer, and the second layer are each preferably obtained by extrusion molding using a vent-type extruder under the condition that the gauge pressure of the vacuum vent is 500 mmHg or more. In this case, it is easy to control the contact angle measured by the droplet method using water within the above range. In the present invention, it is preferable to obtain an intermediate film by setting the gauge pressure high as described above.

  Since the production efficiency of the intermediate film is excellent, it is preferable that the same polyvinyl acetal resin is contained in the first layer and the second layer, and the first layer and the second layer It is more preferable that the same polyvinyl acetal resin and the same plasticizer are contained, and it is more preferable that the first layer and the second layer are formed of the same resin composition.

  The intermediate film preferably has an uneven shape on at least one of the surfaces on both sides. More preferably, the intermediate film has a concavo-convex shape on both surfaces. It does not specifically limit as a method of forming said uneven | corrugated shape, For example, the embossing roll method, the calender roll method, and a profile extrusion method etc. are mentioned. Among them, the embossing roll method is preferable because it can form a large number of concavo-convex embossments that are quantitatively constant.

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

  A laminated glass 31 shown in FIG. 3 includes a first laminated glass member 21, a second laminated glass member 22, and the intermediate film 11. The intermediate film 11 is disposed between the first laminated glass member 21 and the second laminated glass member 22 and is sandwiched.

  A first laminated glass member 21 is laminated on the first surface 11 a of the intermediate film 11. A second laminated glass member 22 is laminated on the second surface 11 b opposite to the first surface 11 a of the intermediate film 11. A first laminated glass member 21 is laminated on the outer surface 1a of the first layer 1 (a second surface opposite to the first surface 1b). A second laminated glass member 22 is laminated on the outer surface 2 a of the second layer 2.

  FIG. 4 is a cross-sectional view schematically showing an example of a laminated glass using the laminated glass interlayer film shown in FIG.

  A laminated glass 31A shown in FIG. 4 includes a first laminated glass member 21, a second laminated glass member 22, and an intermediate film 11A. 11 A of intermediate films are arrange | positioned between the 1st laminated glass member 21 and the 2nd laminated glass member 22, and are inserted | pinched.

  A first laminated glass member 21 is laminated on the first surface 11a of the intermediate film 11A. A second laminated glass member 22 is laminated on the second surface 11b opposite to the first surface 11a of the intermediate film 11A.

  Thus, the laminated glass which concerns on this invention is equipped with the 1st laminated glass member, the 2nd laminated glass member, and the intermediate film, and this intermediate film is the intermediate film for laminated glasses which concerns on this invention. It is. In the laminated glass according to the present invention, the interlayer film is disposed between the first laminated glass member and the second laminated glass member.

  Examples of the laminated glass member include a glass plate and a PET (polyethylene terephthalate) film. 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 is a glass plate or a PET film, the second laminated glass member is a glass plate or a PET film, and the first laminated glass member and the second laminated glass member. At least one of them is preferably a glass plate.

  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, and wire-containing plate 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 thickness of the laminated glass member is preferably 1 mm or more, preferably 5 mm or less, more preferably 3 mm or less. When the laminated glass member is a glass plate, the thickness of the glass plate is preferably 1 mm or more, preferably 5 mm or less, more preferably 3 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 manufacturing method of the said laminated glass is not specifically limited. For example, the intermediate film is sandwiched between the first laminated glass member and the second laminated glass member, passed through a pressing roll, or put in a rubber bag and sucked under reduced pressure, and the first laminated glass member. The air remaining between the laminated glass member, the second laminated glass member and the intermediate film is degassed. Then, it pre-adheres at about 70-110 degreeC, and a laminated body is obtained. Next, the laminated body 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. You may laminate | stack a 1st layer, a 3rd layer, and a 2nd layer at the time of manufacture of the said laminated glass.

  The interlayer film and the laminated glass can be used for automobiles, railway vehicles, aircraft, ships, buildings, and the like. The said intermediate film and the said laminated glass can be used besides these uses. The interlayer film and the laminated glass are preferably a vehicle or architectural interlayer film and a laminated glass, and more preferably a vehicle interlayer film and a laminated glass. The intermediate film and the laminated glass can be used for an automobile windshield, side glass, rear glass, roof glass, or the like. The interlayer film and the laminated glass are suitably used for automobiles. The interlayer film is used for obtaining laminated glass for automobiles.

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

  The following materials were prepared.

(Thermoplastic resin)
A polyvinyl acetal resin having an average polymerization degree, a hydroxyl group content, an acetylation degree, and an acetalization degree of polyvinyl alcohol shown in Table 2 below was used. In the used polyvinyl acetal resin, n-butyraldehyde having 4 carbon atoms is used for acetalization.

  The hydroxyl group content, acetylation degree, and acetalization degree (butyralization degree) were measured by a method in accordance with JIS K6728 “Testing methods for polyvinyl butyral”. In addition, also when measured by ASTM D1396-92, the same numerical value as the method based on JIS K6728 "polyvinyl butyral test method" was shown.

(Plasticizer)
Triethylene glycol di-2-ethylhexanoate (3GO)

(UV shielding agent)
Tinuvin 326 (2- (2′-hydroxy-3′-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, “Tinuvin 326” manufactured by BASF)

(Antioxidant)
H-BHT (2,6-di-t-butyl-4-methylphenol, “H-BHT” manufactured by Sakai Chemical Industry Co., Ltd.)

(Salts containing metal elements)
Type A: Mg mixture 1 (50:50 (weight ratio) mixture of 2-ethyl magnesium butyrate and magnesium acetate)
Type B: Magnesium acetate

Example 1
Preparation of a composition for forming the first layer:
100 parts by weight of polyvinyl acetal resin shown in Table 2 below, 40 parts by weight of plasticizer (3GO), an amount of 0.2% by weight in the first layer from which an ultraviolet shielding agent (Tinvin 326) can be obtained, and oxidation An amount of 0.2 wt% in the first layer from which the inhibitor (H-BHT) can be obtained, and an amount in which the metal element concentration (Mg concentration) is 41 ppm in the intermediate film from which the Mg mixture 1 is obtained. Then, the mixture for mixing with a mixing roll was sufficiently obtained to obtain a composition for forming the first layer.

Preparation of interlayer film:
The composition for forming the first layer was extruded using a vented extruder under the condition that the gauge pressure (vent pressure) of the vacuum vent was 700 mmHg, whereby the first layer (thickness: 760 μm) ) Only single layer intermediate film (thickness: 760 μm). The amount of Mg and the amount of K in the intermediate film were adjusted according to the type and blending amount of the metal salt containing the metal element to be used.

Preparation of interlayer for contact angle measurement:
Two PET films (“Lumirror T60” manufactured by Toray Industries, Inc., 15 cm long × 15 cm wide × 100 μm thick) and two transparent float glasses (15 cm long × 15 cm wide × 2.5 mm thick) washed and dried were prepared. Two PET films were sandwiched between two glass plates, and the intermediate film obtained was further sandwiched between them to obtain a laminate. The obtained laminated body has a laminated structure of glass plate / PET film / intermediate film / PET film / glass plate. The obtained laminate was put in a bag, and the inside of the vacuum bag was deaerated at a reduced pressure of 933.2 hPa at room temperature (23 ° C.). Subsequently, while maintaining the deaerated state, the vacuum bag was heated to 100 ° C. and held for 20 minutes after the temperature reached 100 ° C. Thereafter, the vacuum bag was cooled by natural cooling, and it was confirmed that the temperature had dropped to 30 ° C., and the pressure was released to atmospheric pressure. After the vacuum bag, it was further held for 20 minutes at 135 ° C. and a pressure of 1.2 MPa using an autoclave. The transparent float glass and PET film of the obtained laminate were peeled to obtain an intermediate film.

Preparation of laminated glass for adhesive strength evaluation:
Two transparent float glasses (length 15 cm × width 15 cm × thickness 2.5 mm) that had been washed and dried were prepared. The obtained interlayer film was sandwiched between the two glass plates to obtain a laminate. The obtained laminate was put in a bag, and the inside of the vacuum bag was deaerated at a reduced pressure of 933.2 hPa at room temperature (23 ° C.). Subsequently, while maintaining the deaerated state, the vacuum bag was heated to 100 ° C. and held for 20 minutes after the temperature reached 100 ° C. Thereafter, the vacuum bag was cooled by natural cooling, and it was confirmed that the temperature had dropped to 30 ° C., and the pressure was released to atmospheric pressure.

  The laminated glass temporarily pressure-bonded by the vacuum bag method was pressure-bonded for 20 minutes under the conditions of 135 ° C. and pressure 1.2 MPa using an autoclave to obtain a laminated glass.

( Reference Examples 2 and 3, Examples 4 and 5, Reference Examples 6 and 7, and Comparative Example 1)
The types and contents of the ingredients used in the composition for forming the first layer were set as shown in Table 2 below, and the vent pressure during the production of the intermediate film is shown in Table 2 below. An interlayer film and a laminated glass were obtained in the same manner as in Example 1 except that the settings were made as described above.

(Evaluation)
(1) Measurement of contact angle (Measurement environment) Temperature 23 ° C, relative humidity 50%

  (Measurement method) Water was collected in a syringe and a 1.0 μL droplet was prepared on the needle tip. The produced droplet was brought into contact with the intermediate film peeled off from the PET film to form a droplet on the intermediate film. At this time, the produced droplet was brought into contact with the intermediate film peeled off from the PET film. One second after forming the droplet on the intermediate film, an image of the droplet was taken. The contact angle was calculated by the θ / 2 method by analyzing the image of the droplet. The average value of 10 measurements was taken as the contact angle. The intermediate film was held in a measurement environment for 24 hours before measurement.

  As a measuring apparatus, “DropMaster 500” manufactured by Kyowa Interface Science Co., Ltd. was used.

(2) Immersion haze The intermediate film used for the measurement of the contact angle is immersed in ion exchanged water at 23 ° C. for 10 hours, taken out and wiped off with moisture, using a haze meter (“TC-HIIIDPK” manufactured by Tokyo Denshoku). The haze value was measured according to JIS K6714. The measurement was performed twice, and the average value thereof was taken as the value of immersion haze.

(3) Adhesive strength (Pummel value)
The obtained laminated glass was stored at −18 ° C. ± 0.6 ° C. for 16 hours. The central part of the laminated glass after storage (15 cm long × 15 cm wide) was crushed with a hammer having a head of 0.45 kg until the particle size of the crushed glass was 6 mm or less. After crushing the central part of the laminated glass (length 15 cm × width 15 cm), the degree of exposure (area%) of the interlayer film was measured, and the Pummel value was determined according to Table 1 below. The average value of 6 measured values was adopted as the Pummel value.

  Details and results are shown in Table 2 below.

In addition, the specific Example and reference example of the intermediate film for laminated glasses of 1 layer structure were shown. Even if it is an interlayer film for laminated glass having a structure of two or more layers, the effect of the present invention can be obtained as in the case of the interlayer film for laminated glass having a single-layer structure if the first layer has the above-described configuration. It was confirmed that Further, it was confirmed that the effect of the present invention can be obtained more effectively by adopting the above-described configuration for the first layer and further controlling the contact angle in the second layer as described above.

DESCRIPTION OF SYMBOLS 1 ... 1st layer 1a ... Outer surface (2nd surface)
DESCRIPTION OF SYMBOLS 1b ... 1st surface 2 ... 2nd layer 2a ... Outer surface 3 ... 3rd layer 3a ... 1st surface 3b ... 2nd surface 11 ... Intermediate film 11A ... Intermediate film (1st layer)
DESCRIPTION OF SYMBOLS 11a ... 1st surface 11b ... 2nd surface 21 ... 1st laminated glass member 22 ... 2nd laminated glass member 31 ... Laminated glass 31A ... Laminated glass

Claims (8)

An interlayer film for laminated glass having a structure of one layer or a structure of two or more layers,
As a surface layer in the intermediate film, comprising a first layer containing a thermoplastic resin, a plasticizer and a metal element,
The first layer includes the metal element in a content of 47 ppm or less;
The first layer is an interlayer film for laminated glass, which is a first layer having a contact angle measured by a droplet method using water of 68.1 ° or less . The interlayer film for laminated glass according to claim 1, wherein the content of the metal element in the first layer is 20 ppm or more and 47 ppm or less.   The interlayer film for laminated glass according to claim 1 or 2, wherein the first layer contains the metal element derived from the addition of an alkali metal salt and an alkaline earth metal salt.   The interlayer film for laminated glass according to any one of claims 1 to 3, wherein the metal element is a polyvalent metal element.   The interlayer film for laminated glass according to any one of claims 1 to 4, wherein the first layer contains the metal element due to the addition of magnesium acetate or magnesium 2-ethylbutyrate. An interlayer film for laminated glass having a structure of two or more layers,
As a surface layer in the intermediate film, comprising a second layer containing a thermoplastic resin and a plasticizer,
The interlayer film for laminated glass according to any one of claims 1 to 5, wherein the second layer is disposed on the first surface side of the first layer. The second layer includes a metal element;
The interlayer film for laminated glass according to claim 6, wherein the second layer is a second layer having a contact angle measured by a droplet method using water of less than 73 °. A first laminated glass member;
A second laminated glass member;
An interlayer film for laminated glass according to any one of claims 1 to 7,
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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