JP2019147706A - Interlayer for glass laminate and glass laminate - Google Patents

Abstract

To provide an interlayer for glass laminate excellent in heat resistance, and capable of suppressing discoloration even when used under high temperature.SOLUTION: The interlayer for glass laminate contains a polyvinyl acetal resin and a second resin other than the polyvinyl acetal resin, and having a YI value of 3.5 or less after a first heat resistance test for 2000 hr.: an interlayer having lengthwise of 10 cm and cross wise of 10 cm is prepared. The interlayer is sandwiched with 2 clear float glasses and a test piece is obtained. The test piece is put into an oven at 100°C, taken out from the oven after 2000 hr. passed to set a surface temperature of the test piece at 23°C. The YI value at a position of 5 cm in a lengthwise direction and 2 cm in a crosswise direction of the test piece.SELECTED DRAWING: Figure 1

Description

  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 excellent in safety because it has less scattering of glass fragments even if it is damaged by 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.

  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.

  Patent Document 2 below discloses an intermediate film which is a polymer layer having a glass transition temperature of 33 ° C. or higher. Patent Document 2 describes that the polymer layer is disposed between glass plates having a thickness of 4.0 mm or less.

JP 2007-070200 A US2013 / 0236711A1

  Laminated glass using an intermediate film may be exposed to sunlight and become high temperature.

  In the laminated glass using the conventional intermediate film, when the laminated glass is exposed to a high temperature, the color may be changed.

  An object of the present invention is to provide an interlayer film for laminated glass that has excellent heat resistance and can suppress discoloration even when used at high temperatures. 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, when a polyvinyl acetal resin and a second resin other than the polyvinyl acetal resin are included and the following first heat resistance test is performed in accordance with JIS K7373: 2000 hours, An interlayer film for laminated glass (hereinafter, sometimes referred to as an interlayer film) having a YI value of 3.5 or less after a heat resistance test is provided.

  First heat resistance test: 2000 hours; An intermediate film having a length of 10 cm and a width of 10 cm is prepared. Two sheets of 1 mm clear float glass in accordance with JIS 3202 are prepared. The intermediate film is sandwiched between two clear float glasses, and pre-bonding is performed for 10 minutes under the conditions of 100 ° C. and 100 kPa pressure. Thereafter, pressurization to 1.3 MPa over 10 minutes and heating to 140 ° C. over 30 minutes, followed by pressure bonding under conditions of pressures of 140 ° C. and 1.3 MPa over 20 minutes. Thereafter, the temperature is lowered to 32 ° C. over 40 minutes under a pressurized condition of 1.3 MPa, and then the pressure is reduced to 0 MPa over 10 minutes to obtain a test piece. The test piece is put into an oven at 100 ° C., and after 2000 hours, it is taken out from the oven, and the surface temperature of the test piece is set to 23 ° C. The YI value of the test piece is measured at a position of 5 cm in the horizontal direction and 2 cm in the vertical direction from the end of the test piece to the inside.

  In a specific aspect of the intermediate film according to the present invention, the content of the second resin is 40% by weight or more and 80% by weight or less in a total of 100% by weight of the polyvinyl acetal resin and the second resin. is there.

  In a specific aspect of the interlayer film according to the present invention, the second resin is a (meth) acrylic polymer.

  In a specific aspect of the intermediate film according to the present invention, the material of the (meth) acrylic polymer is a plurality of (meth) acrylic monomers, and the value A represented by the following formula (X) is 3.5. % Or more.

Value A = N (Ar) + N (C3) (X)
N (Ar) = (Σni (Ar) × αi) / (Σni (C) × αi) × 100
N (C3) = (Σni (C3) × αi) / (Σni (C) × αi) × 100
N (Ar): Ratio of the number of aromatic groups having no electron-donating group as a substituent with respect to the total number of carbon atoms of the (meth) acrylic monomer used as the second resin material in the second resin N (C3): ratio of the number of tertiary carbon atoms to the number of all carbon atoms of the (meth) acrylic monomer used as the material of the second resin in the second resin ni (Ar): second Number of aromatic groups having no electron-donating group of (meth) acrylic monomer i used as a material for the second resin in the resin as a substituent ni (C3): of the second resin in the second resin Number of tertiary carbon atoms of (meth) acrylic monomer i used as material ni (C): not an aromatic group of (meth) acrylic monomer i used as material of second resin in second resin Sum of the number of carbon atoms and the number of aromatic groups Αi: molar fraction of the (meth) acrylic monomer i used as the material of the second resin in the second resin when the second resin is 100 mol% The (meth) acrylic monomer i is All the (meth) acrylic monomers used as the material for the second resin in the resin No. 2 are represented, and Σ represents the sum for all the (meth) acrylic monomers i.

  In a specific aspect of the interlayer film according to the present invention, the YI value after the second heat resistance test is 4.0 or less when the following second heat resistance test is performed in accordance with JIS K7373: 3000 hours. It is.

  Second heat resistance test: 3000 hours; heat resistance test in which the heating time in the first heat resistance test was changed from 2000 hours to 3000 hours

  On the specific situation with the intermediate film which concerns on this invention, the said intermediate film contains 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 polyvinyl acetal resin and a second resin other than the polyvinyl acetal resin. In the interlayer film for laminated glass according to the present invention, when the first heat resistance test: 2000 hours, the YI value after the first heat resistance test is 3.5 or less. Since the interlayer film for laminated glass according to the present invention has the above-described configuration, it has excellent heat resistance, and discoloration can be suppressed even when used at high temperatures.

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.

(Interlayer film for laminated glass)
The interlayer film for laminated glass according to the present invention (hereinafter sometimes referred to as an interlayer film) includes a polyvinyl acetal resin and a second resin other than the polyvinyl acetal resin. In the interlayer film according to the present invention, the YI value after the first heat resistance test is 3.5 or less when the following first heat resistance test: 2000 hours is performed in accordance with JIS K7373.

  First heat resistance test: 2000 hours; An intermediate film having a length of 10 cm and a width of 10 cm is prepared. Two sheets of 1 mm clear float glass in accordance with JIS 3202 are prepared. The intermediate film is sandwiched between two clear float glasses, and pre-bonding is performed for 10 minutes under the conditions of 100 ° C. and 100 kPa pressure. Thereafter, pressurization to 1.3 MPa over 10 minutes and heating to 140 ° C. over 30 minutes, followed by pressure bonding under conditions of pressures of 140 ° C. and 1.3 MPa over 20 minutes. Thereafter, the temperature is lowered to 32 ° C. over 40 minutes under a pressurized condition of 1.3 MPa, and then the pressure is reduced to 0 MPa over 10 minutes to obtain a test piece. The test piece is put into an oven at 100 ° C., and after 2000 hours, it is taken out from the oven, and the surface temperature of the test piece is set to 23 ° C. The YI value of the test piece is measured at a position of 5 cm in the horizontal direction and 2 cm in the vertical direction from the end of the test piece to the inside.

  In the present invention, since the above-described configuration is provided, the heat resistance is excellent, and discoloration can be suppressed even when used at a high temperature.

  The YI value after the first heat resistance test is 3.5 or less.

  From the viewpoint of further improving heat resistance and further suppressing discoloration at high temperatures, the YI value after the first heat resistance test is preferably 3.3 or less. The YI value after the first heat resistance test is usually 0 or more.

  From the viewpoint of further improving heat resistance and further suppressing discoloration under high temperature, the following second heat resistance test: after 3000 hours after JIS K7373, after the second heat resistance test The YI value is preferably 4.0 or less.

  Second heat resistance test: 3000 hours; heat resistance test in which the heating time in the first heat resistance test is changed from 2000 hours to 3000 hours

  That is, the second heat resistance test: 3000 hours is as follows.

  Second heat resistance test: 3000 hours; An intermediate film having a length of 10 cm and a width of 10 cm is prepared. Two 1 mm thick clear float glasses in accordance with JIS 3202 are prepared. The intermediate film is sandwiched between two clear float glasses, and precompression bonding is performed for 10 minutes under the conditions of 100 ° C. and 100 kPa pressure. Thereafter, pressurization to 1.3 MPa over 10 minutes and heating to 140 ° C. over 30 minutes, followed by pressure bonding under conditions of pressures of 140 ° C. and 1.3 MPa over 20 minutes. Thereafter, the temperature is lowered to 32 ° C. over 40 minutes under a pressurized condition of 1.3 MPa, and then the pressure is reduced to 0 MPa over 10 minutes to obtain a test piece. The test piece is put in an oven at 100 ° C., and after 3000 hours, the test piece is taken out from the oven, and the surface temperature of the test piece is set to 23 ° C. The YI value of the test piece is measured at a position of 5 cm in the horizontal direction and 2 cm in the vertical direction from the end of the test piece to the inside.

  From the viewpoint of further improving heat resistance and further suppressing discoloration at high temperatures, the YI value after the second heat resistance test is preferably 4.0 or less. The YI value after the second heat resistance test is usually 0 or more.

  From the viewpoint of further improving the heat resistance and further suppressing discoloration at high temperatures, the following third heat resistance test: after 1000 hours after the third heat resistance test in accordance with JIS K7373 The YI value is preferably 3.3 or less.

  Third heat resistance test: 1000 hours; heat resistance test in which the heating time in the first heat resistance test is changed from 2000 hours to 1000 hours

  That is, the third heat resistance test: 1000 hours is as follows.

  Third heat resistance test: 1000 hours; An intermediate film having a length of 10 cm and a width of 10 cm is prepared. Two 1 mm thick clear float glasses in accordance with JIS 3202 are prepared. The intermediate film is sandwiched between two clear float glasses, and precompression bonding is performed for 10 minutes under the conditions of 100 ° C. and 100 kPa pressure. Thereafter, pressurization to 1.3 MPa over 10 minutes and heating to 140 ° C. over 30 minutes, followed by pressure bonding under conditions of pressures of 140 ° C. and 1.3 MPa over 20 minutes. Thereafter, the temperature is lowered to 32 ° C. over 40 minutes under a pressurized condition of 1.3 MPa, and then the pressure is reduced to 0 MPa over 10 minutes to obtain a test piece. The test piece is put in an oven at 100 ° C., and after 1000 hours, the test piece is taken out from the oven, and the surface temperature of the test piece is set to 23 ° C. The YI value of the test piece is measured at a position of 5 cm in the horizontal direction and 2 cm in the vertical direction from the end of the test piece to the inside.

  From the viewpoint of further improving heat resistance and further suppressing discoloration at high temperatures, the YI value after the third heat resistance test is preferably 3.3 or less. The YI value after the third heat resistance test is usually 0 or more.

  From the viewpoint of further improving heat resistance and further suppressing discoloration at high temperatures, the second resin is preferably a (meth) acrylic polymer. From the viewpoint of further improving heat resistance and further suppressing discoloration at high temperatures, the material of the (meth) acrylic polymer is preferably a plurality of (meth) acrylic monomers.

  From the viewpoint of further improving heat resistance and further suppressing discoloration at high temperatures, the value A represented by the following formula (X) in the intermediate film is preferably 3.5% or more.

Value A = N (Ar) + N (C3) (X)
N (Ar) = (Σni (Ar) × αi) / (Σni (C) × αi) × 100
N (C3) = (Σni (C3) × αi) / (Σni (C) × αi) × 100
N (Ar): Ratio of the number of aromatic groups having no electron-donating group as a substituent with respect to the total number of carbon atoms of the (meth) acrylic monomer used as the second resin material in the second resin N (C3): ratio of the number of tertiary carbon atoms to the number of all carbon atoms of the (meth) acrylic monomer used as the material of the second resin in the second resin ni (Ar): second Number of aromatic groups having no electron-donating group of (meth) acrylic monomer i used as a material for the second resin in the resin as a substituent ni (C3): of the second resin in the second resin Number of tertiary carbon atoms of (meth) acrylic monomer i used as material ni (C): not an aromatic group of (meth) acrylic monomer i used as material of second resin in second resin Sum of the number of carbon atoms and the number of aromatic groups Αi: molar fraction of the (meth) acrylic monomer i used as the material of the second resin in the second resin when the second resin is 100 mol% The (meth) acrylic monomer i is All the (meth) acrylic monomers used as the material for the second resin in the resin No. 2 are represented, and Σ represents the sum for all the (meth) acrylic monomers i.

  In the aromatic group having no electron donating group as a substituent, the electron donating group is not substituted on the aromatic group.

  In order to control the value A, it is preferable to polymerize using an appropriate amount of an acrylic monomer containing an aromatic group not having an electron donating group as a substituent and an acrylic monomer containing a tertiary carbon atom.

  Examples of the acrylic monomer containing an aromatic group that does not have the electron donating group as a substituent include benzyl acrylate. Examples of the acrylic monomer containing a tertiary carbon atom include 2-ethylhexyl acrylate, isobornyl acrylate, isobutyl acrylate, and cyclohexyl acrylate.

  Although the detailed mechanism is unknown, by controlling the value A as described above, acrylic radicals that can be generated when used at high temperatures can be captured and discoloration of the interlayer film for laminated glass can be suppressed. It is thought that you can.

  From the viewpoint of further improving heat resistance and further suppressing discoloration at high temperatures, the value A represented by the above formula (X) is preferably 3.8% or more. From the viewpoint of easily synthesizing the second resin, the value A represented by the formula (X) is preferably 15% or less, more preferably 12% or less.

  In the present invention, since the intermediate film contains the polyvinyl acetal resin and the second resin, the bending rigidity at a high temperature can be increased. In order to obtain a laminated glass, the interlayer film is often disposed between the first glass plate and the second glass plate. Even if the thickness of the first glass plate is thin, the bending rigidity of the laminated glass can be sufficiently increased by using the interlayer film according to the present invention. Moreover, even if the thickness of both the first glass plate and the second glass plate is thin, the bending rigidity of the laminated glass can be sufficiently increased by using the interlayer film according to the present invention. In addition, when the thickness of both the 1st glass plate and the 2nd glass plate is thick, the bending rigidity of a laminated glass will become still higher.

  The glass transition temperature of the polyvinyl acetal resin in the intermediate film is preferably 85 ° C. or higher, more preferably 105 ° C. or higher. When the glass transition temperature of the polyvinyl acetal resin is equal to or higher than the lower limit, the bending rigidity at 65 ° C. is further increased. The glass transition temperature of the polyvinyl acetal resin in the intermediate film is preferably 200 ° C. or lower, more preferably 150 ° C. or lower. When the glass transition temperature of the polyvinyl acetal resin is not more than the above upper limit, the moldability is further enhanced. The glass transition temperature of the polyvinyl acetal resin is a glass transition temperature derived from the polyvinyl acetal resin.

  The glass transition temperature of the second resin in the intermediate film is preferably −20 ° C. or higher, more preferably −12 ° C. or higher, preferably 0 ° C. or lower, more preferably −8 ° C. or lower. When the glass transition temperature of the second resin is within the range between the lower limit and the upper limit, the sound insulation is further enhanced. The glass transition temperature of the second resin in the intermediate film is preferably −30 ° C. or lower, more preferably −40 ° C. or lower. When the glass transition temperature of the second resin is equal to or lower than the upper limit, the penetration resistance is further enhanced. The glass transition temperature of the second resin is a glass transition temperature derived from the second resin.

  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 intermediate film according to the present invention includes a first layer. 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 may include only the first layer, and may include a second layer in addition to the first layer. The intermediate film preferably further includes a second layer. When the intermediate film includes the second layer, the second layer is disposed on the first surface side of the first layer.

  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 further includes a third layer. When the intermediate film includes the second layer and the third layer, the third layer is disposed on the second surface side of the first layer opposite to the first surface. The

  The surface of the second layer opposite to the first layer side is preferably the surface on which the laminated glass member or the glass plate is laminated. The thickness of the glass plate laminated | stacked on the said 2nd layer becomes like this. Preferably it is 1.6 mm or less, More preferably, it is 1.3 mm or less. The second surface opposite to the first surface of the first layer (the surface on the second layer side) may be a surface on which a laminated glass member or a glass plate is laminated. The thickness of the glass plate laminated | stacked on the said 1st layer becomes like this. Preferably it is 1.6 mm or less, More preferably, it is 1.3 mm or less. The surface of the third layer opposite to the first layer side is preferably a surface on which a laminated glass member or a glass plate is laminated. The thickness of the glass plate laminated on the third layer is preferably 1.6 mm or less, more preferably 1.3 mm or less.

  The said intermediate film is arrange | positioned between a 1st glass plate and a 2nd glass plate, and is used suitably in order to obtain a laminated glass. Since the bending rigidity can be sufficiently increased due to the intermediate film, the total thickness of the first glass plate and the second glass plate is preferably 3.5 mm or less, more preferably 3 mm. It is as follows. The said intermediate film is arrange | positioned between a 1st glass plate and a 2nd glass plate, and is used suitably in order to obtain a laminated glass. Since the bending rigidity can be sufficiently increased due to the intermediate film, the intermediate film is formed using the first glass plate having a thickness of 1.6 mm or less (preferably 1.3 mm or less). It arrange | positions between 1 glass plate and 2nd glass plate, and is used suitably in order to obtain a laminated glass. The intermediate film includes a first glass plate having a thickness of 1.6 mm or less (preferably 1.3 mm or less) and a second glass plate having a thickness of 1.6 mm or less (preferably 1.3 mm or less). It is used between the first glass plate and the second glass plate and is more preferably used to obtain laminated glass. Also in this case, the bending rigidity can be sufficiently increased due to the intermediate film.

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

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

  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 1a of the first layer 1, the second layer 2 is disposed and laminated. The third layer 3 is disposed on the second surface 1b opposite to the first surface 1a of the first layer 1 and laminated. The first layer 1 is an intermediate layer. Each of the second layer 2 and the third layer 3 is a protective layer, and is a surface layer in the present embodiment. The first layer 1 is arranged between the second layer 2 and the third layer 3 and is sandwiched between them. Therefore, the intermediate film 11 has a multilayer structure (second layer 2 / first layer 1 / third layer) in which the second layer 2, the first layer 1, and the third layer 3 are laminated in this order. Having layer 3).

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

  FIG. 2 is a cross-sectional view schematically showing an interlayer film for laminated glass according to the second embodiment of the present invention.

  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 details of the first layer, the second layer, and the third layer constituting the intermediate film according to the present invention, and the first layer, the second layer, and the third layer are as follows. The detail of each component contained is demonstrated.

(resin)
The intermediate film includes a polyvinyl acetal resin and a second resin other than the polyvinyl acetal resin. The first layer, the second layer, and the third layer preferably contain a polyvinyl acetal resin. The first layer, the second layer, and the third layer preferably contain a second resin other than the polyvinyl acetal resin. As for the said polyvinyl acetal resin, only 1 type may be used and 2 or more types may be used together. As for said 2nd resin, only 1 type may be used and 2 or more types may be used together.

  In a total of 100% by weight of the polyvinyl acetal resin and the second resin, the content of the polyvinyl acetal resin is preferably 20% by weight or more, more preferably 25% by weight or more, and further preferably 30% by weight or more. Especially preferably, it is 35 weight% or more, Preferably it is 60 weight% or less. When the content of the polyvinyl acetal resin is not less than the above lower limit, the bending rigidity is effectively increased. Of the total 100% by weight of the polyvinyl acetal resin and the second resin, the content of the polyvinyl acetal resin is preferably 90% by weight or less, more preferably 80% by weight or less, and even more preferably 75% by weight or less. More preferably, it is 70% by weight or less, particularly preferably 65% by weight or less, and most preferably 60% by weight or less. When the content of the polyvinyl acetal resin is equal to or more than the lower limit, penetration resistance, sound insulation and heat resistance are effectively increased.

  The polyvinyl acetal resin is a polyvinyl acetoacetal resin from the viewpoint of further increasing the tensile properties at high temperatures and effectively increasing the affinity between the resin component and the plasticizer and effectively increasing the penetration resistance. Polyvinyl butyral resin, polyvinyl benzyl acetal resin or polyvinyl cumin acetal resin is preferable.

  From the viewpoint of further increasing the bending rigidity at high temperature, a polyvinyl acetoacetal resin is preferable. In the present specification, polyvinyl acetal resins include acetoacetalized resins, benzyl acetalized resins, and cumin acetalized resins.

  From the viewpoint of effectively increasing the bending rigidity and sound insulation, the intermediate film may be a polyolefin resin, (meth) acrylic polymer, urethane polymer, silicone polymer, rubber, or vinyl acetate polymer as the second resin. It is preferable that a (meth) acrylic polymer is included.

  From the viewpoint of effectively increasing the bending rigidity, the intermediate film contains a polyolefin resin, a (meth) acrylic polymer, a urethane polymer, a silicone polymer, a rubber, or a vinyl acetate polymer as the second resin. It is more preferable that it contains a (meth) acrylic polymer.

  The (meth) acrylic polymer is preferably a polymer of a polymerization component containing (meth) acrylic acid ester. The (meth) acrylic polymer is preferably a poly (meth) acrylic acid ester.

  The poly (meth) acrylic acid ester is not particularly limited. Examples of the poly (meth) acrylate ester include poly (meth) acrylate methyl, poly (meth) ethyl acrylate, poly (meth) acrylate n-propyl, poly (meth) acrylate i-propyl, poly N-butyl (meth) acrylate, i-butyl poly (meth) acrylate, t-butyl poly (meth) acrylate, 2-ethylhexyl poly (meth) acrylate, 2-hydroxyethyl poly (meth) acrylate, Poly (meth) acrylate 2-hydroxypropyl, poly (meth) acrylate 4-hydroxybutyl, poly (meth) acrylate glycidyl, poly (meth) acrylate octyl, poly (meth) acrylate propyl, poly (meth) 2-ethyloctyl acrylate, poly (meth) acrylate nonyl, poly (meth) acrylate isononyl, Li (meth) acrylate decyl, poly (meth) acrylate isodecyl, poly (meth) acrylate lauryl, poly (meth) acrylate isotetradecyl, poly (meth) acrylate cyclohexyl, poly (meth) acrylate isobornyl, And poly (meth) acrylate benzyl. In addition, (meth) acrylic acid having a polar group and (meth) acrylic acid ester include (meth) acrylic acid, 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, ( Examples thereof include glycidyl acrylate and 2-hydroxypropyl acrylate. In the dynamic viscoelastic spectrum, the polyacrylic acid ester is preferred because the temperature showing the maximum value of the loss tangent can be easily controlled within an appropriate range, and polyacrylic acid ester is preferred. 2-ethylhexyl acrylate or octyl polyacrylate is more preferred. By using these preferable poly (meth) acrylic acid esters, the productivity of the intermediate film and the balance of the characteristics of the intermediate film are further improved. As for the said poly (meth) acrylic acid ester, only 1 type may be used and 2 or more types may be used together.

  Of the total 100% by weight of the polyvinyl acetal resin and the second resin, the content of the second resin other than the polyvinyl acetal resin is preferably 20% by weight or more, more preferably 25% by weight or more, and still more preferably. It is 30% by weight or more, more preferably 35% by weight or more. Of the total 100% by weight of the polyvinyl acetal resin and the second resin, the content of the second resin other than the polyvinyl acetal resin is still more preferably 40% by weight or more, particularly preferably 45% by weight or more, most preferably Preferably it is 50 weight% or more. In a total of 100% by weight of the polyvinyl acetal resin and the second resin, the content of the second resin other than the polyvinyl acetal resin is preferably less than 80% by weight. When the content of the second resin is equal to or higher than the lower limit, the sound insulation is effectively increased. Of the total 100% by weight of the polyvinyl acetal resin and the second resin, the content of the second resin is preferably 90% by weight or less, more preferably 80% by weight or less, and even more preferably 75% by weight or less. Particularly preferred is 70% by weight or less, and most preferred is 65% by weight or less. When the content of the second resin is not more than the upper limit, the bending rigidity is effectively increased.

  In a total of 100% by weight of the polyvinyl acetal resin and the second resin, the content of the (meth) acrylic polymer is preferably 20% by weight or more, more preferably 25% by weight or more, and even more preferably 30% by weight. As mentioned above, More preferably, it is 35 weight% or more. In a total of 100% by weight of the polyvinyl acetal resin and the second resin, the content of the (meth) acrylic polymer is still more preferably 40% by weight or more, particularly preferably 45% by weight or more, and most preferably 50%. % By weight or more. In a total of 100% by weight of the polyvinyl acetal resin and the second resin, the content of the (meth) acrylic polymer is preferably less than 100% by weight. When the content of the acrylic polymer is not less than the above lower limit, deaeration and sound insulation properties are effectively increased. In the total 100% by weight of the polyvinyl acetal resin and the second resin, the content of the (meth) acrylic polymer is preferably 90% by weight or less, more preferably 80% by weight or less, and still more preferably 75% by weight. % Or less, particularly preferably 70% by weight or less, and most preferably 65% by weight or less. When the content of the (meth) acrylic polymer is not more than the above upper limit, the bending rigidity is effectively increased.

  It is preferable that the second resin has a cross-linked structure or the polyvinyl acetal resin and the second resin are cross-linked. The intermediate film may contain the polyvinyl acetal resin and the second resin as a crosslinked product in which the polyvinyl acetal resin and the second resin are crosslinked.

  Examples of the method for crosslinking the resin include the following methods. A method in which crosslinks are formed by introducing functional groups that react with each other into the polymer structure of the resin. A method of crosslinking using a crosslinking agent having two or more functional groups that react with a functional group present in the polymer structure of the resin. A method of crosslinking a polymer by using a radical generator having a hydrogen abstraction ability such as peroxide. A method of crosslinking by electron beam irradiation. Since the shear storage modulus can be easily controlled and the productivity of the intermediate film is increased, a method in which functional groups that react with each other are introduced into the polymer structure of the resin to form a crosslink is preferable.

  When the intermediate film contains a crosslinked product of the polyvinyl acetal resin and the second resin, the glass transition temperature of the polyvinyl acetal resin indicates a glass transition temperature derived from the polyvinyl acetal resin in the crosslinked product. The glass transition temperature of the second resin indicates a glass transition temperature derived from the second resin in the crosslinked product.

  The first layer (including a single-layer intermediate film) preferably contains a thermoplastic resin (hereinafter sometimes referred to as a thermoplastic resin (1)). The first layer (including a single-layer intermediate film) preferably includes a polyvinyl acetal resin (hereinafter sometimes referred to as a polyvinyl acetal resin (1)) as the thermoplastic resin (1). When the intermediate film is a single-layer intermediate film composed of only the first layer, the intermediate film preferably contains the polyvinyl acetal resin (1). The second layer preferably contains a thermoplastic resin (hereinafter sometimes referred to as a thermoplastic resin (2)). The second layer preferably contains a polyvinyl acetal resin (hereinafter sometimes referred to as a polyvinyl acetal resin (2)) as the thermoplastic resin (2). The third layer preferably contains a thermoplastic resin (hereinafter sometimes referred to as a thermoplastic resin (3)). The third layer preferably contains a polyvinyl acetal resin (hereinafter sometimes referred to as a polyvinyl acetal resin (3)) as the thermoplastic resin (3). The polyvinyl acetal resin (1), the polyvinyl acetal resin (2), and the polyvinyl acetal resin (3) may be the same or different. Since the sound insulation is further enhanced, the polyvinyl acetal resin (1) is preferably different from the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3). The thermoplastic resin (1), the thermoplastic resin (2), and the thermoplastic 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. 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.

  Examples of the thermoplastic resin include polyvinyl acetal resin, polyacrylic 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 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 (PVA) 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 It is 5000 or less, more preferably 4000 or less, and still more preferably 3500 or less. When the average degree of polymerization is not less than the above lower limit, the penetration resistance and bending rigidity of the laminated glass are further increased. 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 in the polyvinyl acetal resin is preferably 2 to 10, more preferably 2 to 5, and further preferably 2, 3 or 4. The carbon number of the acetal group in the polyvinyl acetal resin is preferably 2 or 4, and in this case, the production of the polyvinyl acetal resin is efficient.

  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 thereof include n-nonyl aldehyde, n-decyl aldehyde, cumin aldehyde, and benzaldehyde. Acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexylaldehyde or n-valeraldehyde are preferred. Acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde or n-valeraldehyde is more preferred, and acetaldehyde, n-butyraldehyde or n-valeraldehyde is still more preferred. As for the said aldehyde, only 1 type may be used and 2 or more types may be used together.

  When the polyvinyl acetal resin (1) is used as part of a multilayer interlayer film, the hydroxyl group content preferably satisfies the following. The hydroxyl group content (hydroxyl content) of the polyvinyl acetal resin (1) is preferably 25 mol% or more, more preferably 28 mol% or more, more preferably 30 mol% or more, and even more preferably 31.5 mol%. More preferably, it is at least 32 mol%, particularly preferably at least 33 mol%. The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin (1) is preferably not more than 37 mol%, more preferably not more than 36.5 mol%, still more preferably not more than 36 mol%. When the hydroxyl group content is at least the above lower limit, the bending rigidity is further increased, and 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 content) of the polyvinyl acetal resin (1) is preferably 17 mol% or more, more preferably 20 mol% or more, still more preferably 22 mol% or more, preferably 28 mol% or less, more preferably. Is 27 mol% or less, more preferably 25 mol% or less, and particularly preferably 24 mol% or less. In particular, when the polyvinyl acetal resin (1) is used as a part of a multilayer interlayer film, it is preferable that the lower limit and the upper limit of the hydroxyl group content are satisfied. When the hydroxyl group content is equal to or higher than the lower limit, the mechanical strength of the interlayer film is further increased. In particular, when the hydroxyl group content of the polyvinyl acetal resin (1) is 20 mol% or more, the reaction efficiency is high and the productivity is excellent, and when it is 28 mol% or less, 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 content of each hydroxyl group in the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 25 mol% or more, more preferably 28 mol% or more, more preferably 30 mol% or more, and still more preferably. It is 31.5 mol% or more, more preferably 32 mol% or more, and particularly preferably 33 mol% or more. Each content rate of the hydroxyl group of the said polyvinyl acetal resin (2) and the said polyvinyl acetal resin (3) becomes like this. Preferably it is 37 mol% or less, More preferably, it is 36.5 mol% or less, More preferably, it is 36 mol% or less. When the hydroxyl group content is at least the above lower limit, the bending rigidity is further increased, and 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.

  From the viewpoint of further enhancing the sound insulation, the hydroxyl group content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (2). From the viewpoint of further increasing the sound insulation, the hydroxyl group content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl group content of the polyvinyl acetal resin (3). From the viewpoint of further improving sound insulation, the absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (2) is preferably 1 mol% or more. More preferably, it is 5 mol% or more, more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. From the viewpoint of further improving sound insulation, the absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (3) is preferably 1 mol% or more. More preferably, it is 5 mol% or more, more preferably 9 mol% or more, particularly preferably 10 mol% or more, and most preferably 12 mol% or more. The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (2), the hydroxyl group content of the polyvinyl acetal resin (1), and the above The absolute value of the difference from the hydroxyl group content of the polyvinyl acetal resin (3) is preferably 20 mol% or less.

  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 ethylene group to which the hydroxyl group is bonded can be measured, for example, according to JIS K6728 “Testing method for polyvinyl butyral”.

  The degree of acetylation (acetyl group amount) of the polyvinyl acetal resin (1) is preferably 0.01 mol% or more, more preferably 0.1 mol% or more, still more preferably 7 mol% or more, 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 24 mol%. When the degree of acetylation is not less than the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer or other thermoplastic resin is increased, the sound insulation and penetration resistance are further improved, and the performance is further improved over a long period of time. Stabilize. 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 degree of acetylation of the polyvinyl acetal resin (1) is 0.1 mol% or more and 25 mol% or less, the penetration resistance is further improved.

  Each degree of acetylation of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) 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 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 of the polyvinyl acetal resin (1) (in the case of polyvinyl butyral resin, the degree of butyralization) is preferably 47 mol% or more, more preferably 60 mol% or more, still more preferably 68 mol% or more, preferably It is 85 mol% or less, More preferably, it is 80 mol% or less, More preferably, it is 75 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 (degree of butyralization in the case of polyvinyl butyral resin) of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably 55 mol% or more, more preferably 60 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 is determined as follows. First, a value obtained by subtracting the amount of ethylene groups bonded with hydroxyl groups and the amount of ethylene groups bonded with acetyl groups from the total amount of ethylene groups in the main chain is obtained. The obtained value is divided by the total amount of ethylene groups in the main chain to obtain the mole fraction. A value indicating the mole fraction as a percentage is the degree of acetalization.

  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

(Plasticizer)
The interlayer film preferably contains a plasticizer. The first layer (including a single-layer interlayer) preferably 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 using a plasticizer, and by using a polyvinyl acetal resin and a plasticizer in combination, the penetration resistance is further improved, and the adhesive strength of the layer containing the polyvinyl acetal resin and the plasticizer to the laminated glass member or other layers is moderately high. Become. 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 (1), the said plasticizer (2), and the said plasticizer (3), only 1 type may respectively 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. . 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, alkyd oil-modified 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. . More preferably, the plasticizer includes triethylene glycol di-2-ethylhexanoate or triethylene glycol di-2-ethylbutyrate, and further includes triethylene glycol di-2-ethylhexanoate. preferable.

  The content of the plasticizer is preferably 1 part by weight or more, more preferably 2 parts by weight or more, and still more preferably 3 parts by weight or more with respect to 100 parts by weight of the total of the polyvinyl acetal resin and the second resin. The amount is preferably 15 parts by weight or less, more preferably 10 parts by weight or less, and still more preferably 8 parts by weight or less. When the content of the plasticizer is not less than the above lower limit, the tensile properties and sound insulation at high temperatures are further enhanced. When the content of the plasticizer is not more than the above upper limit, the bending rigidity is further increased.

  In the second layer, the plastic with respect to 100 parts by weight of the thermoplastic resin (2) (when the thermoplastic resin (2) is a polyvinyl acetal resin (2), 100 parts by weight of the polyvinyl acetal resin (2)). Let content of an agent (2) be content (2). In the third layer, the plastic relative to 100 parts by weight of the thermoplastic resin (3) (when the thermoplastic resin (3) is a polyvinyl acetal resin (3), 100 parts by weight of the polyvinyl acetal resin (3)). Let content of an agent (3) be content (3). The content (2) and the content (3) are each preferably 10 parts by weight or more, more preferably 15 parts by weight or more, preferably 40 parts by weight or less, more preferably 35 parts by weight or less, and still more preferably 32 parts. It is 30 parts by weight or less, particularly preferably 30 parts by weight or less. When the content (2) and the content (3) are equal to or higher than the lower limit, the flexibility of the intermediate film is increased and the handling of the intermediate film is facilitated. When the content (2) and the content (3) are equal to or lower than the upper limit, the bending rigidity is further increased.

  In the first layer, the plastic relative to 100 parts by weight of the thermoplastic resin (1) (or 100 parts by weight of the polyvinyl acetal resin (1) when the thermoplastic resin (1) is a polyvinyl acetal resin (1)). Let content of an agent (1) be content (1). The content (1) is preferably 1 part by weight or more, more preferably 2 parts by weight or more, still more preferably 3 parts by weight or more, still more preferably 5 parts by weight or more, preferably 90 parts by weight or less, more preferably 85 parts by weight or less, more preferably 80 parts by weight or less. When the content (1) is not less than the above lower limit, the flexibility of the intermediate film is increased, and the handling of the intermediate film is facilitated. When the content (1) is not more than the above upper limit, the penetration resistance of the laminated glass is further enhanced. The content (1) may be 50 parts by weight or more, 55 parts by weight or more, or 60 parts by weight or more. The content (1) may be 30 parts by weight or less, 20 parts by weight or less, or 10 parts by weight or less.

  When the interlayer film has two or more layers, the content (1) is preferably larger than the content (2) in order to enhance the sound insulation of the laminated glass, and the content (1) is It is preferable that there is more than the said content (3).

  From the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the content (2) and the content (1), and the difference between the content (3) and the content (1). Is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and still more preferably 20 parts by weight or more. The absolute value of the difference between the content (2) and the content (1) and the absolute value of the difference between the content (3) and the content (1) are each preferably 80 parts by weight or less. More preferably, it is 75 weight part or less, More preferably, it is 70 weight part or less.

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

  The heat shielding material preferably contains at least one component X of phthalocyanine compounds, naphthalocyanine compounds and anthracocyanine compounds, or contains heat shielding particles. In this case, both the component X and the heat shielding particles may be included.

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 material. 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.

  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. 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 0.2% by weight or less, more preferably 0.1%. % By weight or less, 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 (including a single-layer intermediate film) preferably includes 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 materials. 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 “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%. .1% by weight or more, more preferably 1% by weight or more, and particularly preferably 1.5% by weight or more. 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 6% by weight or less, more preferably 5.5%. % By weight or less, more preferably 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.

(Adhesive strength modifier)
From the viewpoint of effectively improving impact resistance and penetration resistance, the intermediate film is composed of an adhesive strength modifier having a carboxyl group, a hydroxyl group, a sulfo group, an amino group, or a phosphate group (hereinafter referred to as an adhesive strength modifier L). Which may be described). The first layer preferably contains the adhesive strength modifier L. The second layer preferably contains the adhesive strength modifier L. It is preferable that the third layer includes the adhesive force adjusting agent L. Use of the adhesive strength adjusting agent L makes it easy to control the adhesion between the interlayer film and the laminated glass member or the adhesion between the interlayers in the interlayer film, and the peel strength between the interlayer film and the laminated glass member is moderate. It becomes easy to control within a wide range. Further, the use of the adhesive strength modifier L effectively increases the impact resistance and penetration resistance. As for the said adhesive force regulator L, only 1 type may be used and 2 or more types may be used together.

  From the viewpoint of further improving impact resistance and penetration resistance, the adhesive force adjusting agent L preferably has a carboxyl group and a hydroxyl group, and more preferably has a carboxyl group. The adhesive force adjusting agent L may have a hydroxyl group. When the adhesive strength modifier L has a hydroxyl group, the hydroxyl group is preferably not a phenolic hydroxyl group.

  UC3510 is mentioned as an adhesive force regulator which has a carboxyl group.

  Examples of the adhesive strength adjusting agent having a hydroxyl group include KE-604.

  Examples of the adhesion adjusting agent having a thiol group include LP-55 and LP-980.

  Examples of the adhesion adjusting agent having an amino group include PAA-01 and PAA-03.

  JP-524R is mentioned as an adhesive force regulator which has a phosphoric acid group.

  The molecular weight of the adhesive strength adjusting agent L is preferably 100 or more, more preferably 200 or more, still more preferably 500 or more, preferably 10,000 or less, more preferably 5000 or less, and still more preferably 4000 or less. When the molecular weight is not less than the above lower limit and not more than the above upper limit, impact resistance and penetration resistance can be further improved, and the compatibility between the adhesive strength modifier L and other components is increased.

  The content of the adhesion adjusting agent L is preferably 0.01 parts by weight or more, more preferably 0.05 parts by weight or more, with respect to 100 parts by weight of the total of the polyvinyl acetal resin and the second resin. The amount is preferably 3 parts by weight or less, more preferably 1 part by weight or less. When the content of the adhesive force adjusting agent L is not less than the above lower limit and not more than the above upper limit, impact resistance and penetration resistance are further enhanced.

  When the adhesive strength adjusting agent L has a carboxyl group, the content of the adhesive strength adjusting agent having a carboxyl group is preferably 0.00 with respect to 100 parts by weight in total of the polyvinyl acetal resin and the second resin. 01 parts by weight or more, more preferably 0.05 parts by weight or more, and still more preferably 0.1 parts by weight or more. When the adhesive strength adjusting agent L has a carboxyl group, the content of the adhesive strength adjusting agent having a carboxyl group is preferably 0.00 with respect to 100 parts by weight in total of the polyvinyl acetal resin and the second resin. 5 parts by weight or less, more preferably 0.3 parts by weight or less, and preferably 0.25 parts by weight or less. When the content of the adhesion adjusting agent having a carboxyl group is not less than the above lower limit and not more than the above upper limit, impact resistance and penetration resistance are further enhanced.

  When the adhesive strength adjusting agent L has a hydroxyl group, the content of the adhesive strength adjusting agent having a hydroxyl group is preferably 0.1 weight with respect to a total of 100 parts by weight of the polyvinyl acetal resin and the second resin. Part or more, more preferably 0.2 part by weight or more, still more preferably 0.25 part by weight or more, particularly preferably 0.5 part by weight or more. When the adhesive strength modifier L has a hydroxyl group, the content of the adhesive strength modifier having a hydroxyl group is preferably 3 parts by weight or less with respect to a total of 100 parts by weight of the polyvinyl acetal resin and the second resin. More preferably, it is 2 parts by weight or less, and still more preferably 1 part by weight or less. When the content of the adhesion adjusting agent having a hydroxyl group is not less than the above lower limit and not more than the above upper limit, impact resistance and penetration resistance are further enhanced.

(Metal salt)
The intermediate film may contain at least one metal salt (hereinafter sometimes referred to as metal salt M) among alkali metal salts, alkaline earth metal salts, and magnesium salts. The first layer may contain the metal salt M. The second layer may contain the metal salt M. The third layer may contain the metal salt M. 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 may contain 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 intermediate film may contain at least one metal of K and Mg.

  The metal salt M is an alkali metal salt of an organic acid having 2 to 16 carbon atoms, an alkaline earth metal salt of an organic acid having 2 to 16 carbon atoms, or a magnesium salt of an organic acid having 2 to 16 carbon atoms. Alternatively, it may be a C 2-16 carboxylic acid magnesium salt or a C 2-16 carboxylic acid potassium salt.

  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.

  The total content of Mg and K in the layer containing the metal salt M (first layer, second layer or third layer) may be 5 ppm or more, or 10 ppm or more, It may be 20 ppm or more, 300 ppm or less, 250 ppm or less, or 200 ppm or less.

(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 an ultraviolet shielding agent containing a metal atom, an ultraviolet shielding agent containing a metal oxide, an ultraviolet shielding agent having a benzotriazole structure (benzotriazole compound), and an ultraviolet shielding agent having a benzophenone structure (benzophenone compound). ), UV screening agent having triazine structure (triazine compound), UV screening agent having malonate ester structure (malonic acid ester compound), UV screening agent having oxalic acid anilide structure (oxalic acid anilide compound) and benzoate structure Examples thereof include an ultraviolet shielding agent (benzoate compound).

  Examples of the ultraviolet shielding agent containing a metal atom 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 an ultraviolet shielding agent having a benzotriazole structure, an ultraviolet shielding agent having a benzophenone structure, an ultraviolet shielding agent having a triazine structure, or an ultraviolet shielding agent having a benzoate structure. The ultraviolet shielding agent is more preferably an ultraviolet shielding agent having a benzotriazole structure or an ultraviolet shielding agent having a benzophenone structure, and more preferably an ultraviolet shielding agent having a benzotriazole structure.

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

  Examples of the ultraviolet shielding agent having the benzotriazole structure 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 (BASF) “Tinuvin 326”), 2- (2′-hydroxy-3 ′, 5′-di-amylphenyl) benzotriazole (“Tinvin 328” manufactured by BASF), and the like. Since the performance of absorbing ultraviolet rays is excellent, the ultraviolet shielding agent is preferably an ultraviolet shielding agent having a benzotriazole structure containing a halogen atom, and may be an ultraviolet shielding agent having a benzotriazole structure containing a chlorine atom. More preferred.

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

  Examples of the ultraviolet shielding agent having the triazine structure include “LA-F70” manufactured by ADEKA and 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl). And oxy] -phenol ("Tinuvin 1577FF" manufactured by BASF).

  Examples of the ultraviolet screening agent having a malonic ester structure include dimethyl 2- (p-methoxybenzylidene) malonate, tetraethyl-2,2- (1,4-phenylenedimethylidene) bismalonate, and 2- (p-methoxybenzylidene). -Bis (1,2,2,6,6-pentamethyl 4-piperidinyl) malonate and the like.

  Examples of commercially available ultraviolet screening agents having the malonic ester structure include Hostavin B-CAP, Hostavin PR-25, and Hostavin PR-31 (all manufactured by Clariant).

  Examples of the ultraviolet shielding agent having the oxalic anilide structure include N- (2-ethylphenyl) -N ′-(2-ethoxy-5-t-butylphenyl) oxalic acid diamide, N- (2-ethylphenyl)- Oxalic acid diamide having an aryl group substituted on the nitrogen atom, such as N ′-(2-ethoxy-phenyl) oxalic acid diamide, 2-ethyl-2′-ethoxy-oxyanilide (“Slandor VSU” manufactured by Clariant) Kind.

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

  In 100% by weight of the layer containing the ultraviolet screening agent (first layer, second layer or third layer), the content of the ultraviolet screening agent is preferably 0.1% by weight or more, more preferably 0%. .2% by weight or more, more preferably 0.3% by weight or more, and particularly preferably 0.5% by weight or more. In 100% by weight of the layer containing the ultraviolet shielding agent (first layer, second layer or third layer), the content of the ultraviolet shielding agent is preferably 2.5% by weight or less, more preferably 2%. % By weight or less, more preferably 1% by weight or less, particularly preferably 0.8% by weight or less. When the content of the ultraviolet shielding agent is not less than the above lower limit and not more than the above upper limit, a decrease in visible light transmittance after a lapse of time can be further suppressed. 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), butylhydroxyanisole (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-t-butylphenyl) butane Tetrakis [methylene-3- (3 ′, 5′-butyl-4-hydroxyphenyl) propionate] methane, 1,3,3-tris- (2-methyl-4-hydride) Xyl-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) 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, and 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 Sumitomo Chemical Industries Examples thereof include “Sumilyzer GA-80”, “H-BHT” manufactured by Sakai Chemical Industry Co., Ltd., and “IRGANOX 1010” manufactured by BASF.

  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. .

(Light stabilizer)
The intermediate film preferably contains a light stabilizer. The first layer preferably contains a light stabilizer. The second layer preferably contains a light stabilizer. The third layer preferably contains a light stabilizer. By using the light stabilizer, even if the interlayer film is used for a long period of time or exposed to sunlight, the discoloration is further suppressed, and the visible light transmittance is further hardly lowered. As for the said light stabilizer, only 1 type may be used and 2 or more types may be used together.

  From the viewpoint of further suppressing discoloration, the light stabilizer is preferably a hindered amine light stabilizer.

  Examples of the hindered amine light stabilizer include a hindered amine light stabilizer in which an alkyl group, an alkoxy group, or a hydrogen atom is bonded to a nitrogen atom of a piperidine structure. From the viewpoint of further suppressing discoloration, a hindered amine light stabilizer in which an alkyl group or an alkoxy group is bonded to the nitrogen atom of the piperidine structure is preferable. The hindered amine light stabilizer is preferably a hindered amine light stabilizer in which an alkyl group is bonded to the nitrogen atom of the piperidine structure, and is a hindered amine light stabilizer in which an alkoxy group is bonded to the nitrogen atom of the piperidine structure. Is also preferable.

  Examples of the hindered amine light stabilizer in which an alkyl group is bonded to the nitrogen atom of the piperidine structure include “Tinvin 765” and “Tinvin 622SF” manufactured by BASF, and “Adekastab LA-52” manufactured by ADEKA.

  Examples of the hindered amine light stabilizer in which an alkoxy group is bonded to the nitrogen atom of the piperidine structure include “Tinvin XT-850FF” and “Tinuvin XT-855FF” manufactured by BASF, and “Adekastab LA-81” manufactured by ADEKA. .

  Examples of the hindered amine light stabilizer in which a hydrogen atom is bonded to a nitrogen atom of the piperidine structure include “Tinvin 770DF” manufactured by BASF and “Hostavin N24” manufactured by Clariant.

  From the viewpoint of further suppressing discoloration, the molecular weight of the light stabilizer is preferably 2000 or less, more preferably 1000 or less, and still more preferably 700 or less.

  In 100% by weight of the intermediate film or 100% by weight of the layer containing the light stabilizer (first layer, second layer, third layer or colored layer), the content of the light stabilizer is preferably 0.00. It is 0025% by weight or more, more preferably 0.025% by weight or more, preferably 0.5% by weight or less, more preferably 0.3% by weight or less. When the content of the light stabilizer is not less than the above lower limit and not more than the above upper limit, discoloration can be effectively suppressed.

(Other ingredients)
The intermediate film, the first layer, the second layer, and the third layer are respectively a coupling agent containing silicon, aluminum, or titanium, a dispersant, a surfactant, a flame retardant, Additives such as antistatic agents, fillers, pigments, dyes, adhesive strength modifiers, moisture-proofing agents, fluorescent brighteners and infrared absorbers may be included. As for these additives, only 1 type may be used and 2 or more types may be used together.

  In order to control the shear storage modulus within a suitable range, the intermediate film, the first layer, the second layer, and the third layer may contain a filler. Examples of the filler include calcium carbonate particles and silica particles. Silica particles are preferable from the viewpoint of effectively increasing the bending rigidity and effectively suppressing the decrease in transparency.

  In 100% by weight of the layer containing the filler (first layer, second layer or third layer), the content of the filler is preferably 1% by weight or more, more preferably 5% by weight or more, and still more preferably. It is 10% by weight or more, preferably 60% by weight or less, more preferably 50% by weight or less.

(Other details of interlayer film for laminated glass)
The thickness of the intermediate film is not particularly limited. From the viewpoint of practical use and from the viewpoint of sufficiently enhancing the penetration resistance and bending rigidity of the laminated glass, the thickness of the interlayer film is preferably 0.1 mm or more, more preferably 0.25 mm or more, preferably 3 mm or less, more Preferably it is 1.5 mm or less. When the thickness of the interlayer film is not less than the above lower limit, the penetration resistance and bending rigidity of the laminated glass are further increased. When the thickness of the interlayer film is not more than the above upper limit, the transparency of the interlayer film is further improved.

  Let T be the thickness of the intermediate film. The thickness of the first layer is preferably 0.035T or more, more preferably 0.0625T or more, further preferably 0.1T or more, preferably 0.4T or less, more preferably 0.375T or less, and still more preferably. It is 0.25 T or less, particularly preferably 0.15 T or less. When the thickness of the first layer is 0.4 T or less, the bending rigidity is further improved.

  Each thickness of the second layer and the third layer is preferably 0.3 T or more, more preferably 0.3125 T or more, still more preferably 0.375 T or more, preferably 0.97 T or less, more preferably 0. 9375T or less, more preferably 0.9T or less. Each thickness of the second layer and the third layer may be 0.46875T or less, or 0.45T or less. Moreover, the bending rigidity of a laminated glass becomes still higher that each thickness of the said 2nd layer and the said 3rd layer is more than the said minimum and below the said upper limit.

  The total thickness of the second layer and the third layer is preferably 0.625 T or more, more preferably 0.75 T or more, still more preferably 0.85 T or more, preferably 0.97 T or less, more preferably 0.9375T or less, more preferably 0.9T or less. Further, when the total thickness of the second layer and the third layer is not less than the lower limit and not more than the upper limit, the bending rigidity of the laminated glass is further increased.

  The intermediate film may be an intermediate film having a uniform thickness or an intermediate film having a changed thickness. The cross-sectional shape of the intermediate film may be rectangular or wedge-shaped.

  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 interlayer film according to the present invention, in the case of a multilayer interlayer film, for example, a method in which each layer is formed using each resin composition for forming each layer and then the obtained layers are stacked. 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.

  Since the production efficiency of the intermediate film is excellent, the same polyvinyl acetal resin is preferably contained in the second layer and the third layer. Since the production efficiency of the intermediate film is excellent, it is more preferable that the same polyvinyl acetal resin and the same plasticizer are contained in the second layer and the third layer. Since the production efficiency of the intermediate film is excellent, it is more preferable that the second layer and the third 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 lip embossing method, the embossing roll method, the calender roll method, a profile extrusion method, etc. are mentioned. 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 2 a of the second layer 2. A second laminated glass member 22 is laminated on the outer surface 3 a of the third layer 3.

  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.

  The first laminated glass member is preferably a first glass plate. The second laminated glass member is preferably a second glass plate.

  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. The laminated glass is a laminate including a glass plate, and preferably at least one glass plate is used. Each of the first laminated glass member and the second laminated glass member is a glass plate or a PET film, and the laminated glass is one of the first laminated glass member and the second laminated glass member. It is preferable to provide a glass plate as at least one.

  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 that replaces the 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 0.5 mm or more, more preferably 0.7 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.

  By using the interlayer film according to the present invention, even when the laminated glass is thin, the bending rigidity of the laminated glass can be maintained high. The thickness of the glass plate is preferably 2 mm or less, more preferably 1.8 mm or less, even more preferably 1.6 mm or less, still more preferably 1.5 mm or less, still more preferably 1.4 mm or less, and even more preferably 1. 0.3 mm or less, still more preferably 1.0 mm or less, and particularly preferably 0.7 mm or less. If the thickness of the glass plate is less than or equal to the above upper limit, the laminated glass is reduced in weight, the environmental load is reduced by reducing the material of the laminated glass, or the automobile fuel efficiency is improved by reducing the laminated glass in the environmental load. Can be reduced. The total thickness of the first glass plate and the second glass plate is preferably 3.5 mm or less, more preferably 3.2 mm or less, still more preferably 3 mm or less, particularly preferably 2.8 mm or less. It is. If the sum of the thickness of the first glass plate and the thickness of the second glass plate is not more than the above upper limit, the laminated glass is reduced in weight, or the environmental load is reduced by reducing the material of the laminated glass, By reducing the weight of the laminated glass, it is possible to improve the fuel efficiency of the automobile and reduce the environmental load.

  The manufacturing method of the said laminated glass is not specifically limited. First, an interlayer film is sandwiched between the first laminated glass member and the second laminated glass member to obtain a laminate. Next, for example, by passing the obtained laminate through a pressing roll or putting it in a rubber bag and sucking under reduced pressure, the first laminated glass member, the second laminated glass member, and the intermediate film The remaining air is deaerated. After that, pre-bonding is performed at about 70 to 110 ° C. to obtain a pre-bonded laminate. Next, the pre-press-bonded 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. You may laminate | stack a 1st layer, a 2nd layer, and a 3rd 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.

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

  The following materials were prepared.

(Polyvinyl acetal resin)
Polyvinyl acetal resins shown in Tables 1 and 2 below were appropriately used.

  With respect to 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, also when measured by ASTM D1396-92, the same numerical value as the method based on JIS K6728 "polyvinyl butyral test method" was shown. Further, when the type of acetal is acetoacetal or the like, the degree of acetal is similarly measured for the degree of acetylation and the hydroxyl group content, and the molar fraction is calculated from the obtained measurement results, It is calculated by subtracting the acetylation degree and the hydroxyl group content from 100 mol%.

(Second resin)
(Meth) acrylic polymers shown in Tables 1 and 2 below were appropriately used.

  The (meth) acrylic polymers shown in Tables 1 and 2 below are acrylic polymers obtained by polymerizing polymerization components containing the following components in the contents shown in Tables 1 and 2 below.

Ethyl acrylate 2-ethylhexyl acrylate Benzyl acrylate 2-hydroxyethyl acrylate n-butyl acrylate Isobornyl acrylate Tripropylene glycol diacrylate (crosslinking agent)

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

(Adhesive strength modifier L)
UC3510 (Adhesive force regulator having a molecular weight of 1500 and a galboxyl group, manufactured by Toagosei Co., Ltd.)
KE-604 (molecular weight 400, adhesion adjusting agent having a hydroxyl group, manufactured by Arakawa Chemical Industries, Ltd.)

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

(Antioxidant)
BHT (2,6-di-t-butyl-p-cresol)
IRGANOX 1010 ("IRGANOX 1010" manufactured by BASF)
GA-80 (“Sumilyzer GA-80” manufactured by Sumitomo Chemical Co., Ltd.)

(Light stabilizer)
Tinuvin 765 ("Tinvin 765" manufactured by BASF)

Example 1
Preparation of a composition for forming an intermediate film (first layer):
The following components were mixed to obtain a composition for forming an intermediate film.

100 parts by weight of polyvinyl acetal resin of the type shown in Table 1 150 parts by weight of (meth) acrylic polymer of the type shown in Table 1 12.5 parts by weight of plasticizer (3GO) Adhesive strength modifier L (UC3510) 0. 2 parts by weight UV shielding agent in an amount of 0.4% by weight in the obtained intermediate film (Tinuvin 326)
Antioxidant (IRGANOX 1010) in an amount of 0.4% by weight in the obtained interlayer film
Light stabilizer (Tinvin 765) in an amount of 0.05% by weight in the obtained interlayer film

Preparation of interlayer film:
The composition for forming the intermediate film was extruded using an extruder to produce an intermediate film having a thickness of 760 μm.

Preparation of laminated glass (for heat resistance test):
An intermediate film (thickness 0.76 mm) including a polyvinyl acetal resin and a second resin other than the polyvinyl acetal resin was prepared. Two clear float glasses having a thickness of 1 mm and 10 cm × 10 cm in accordance with JIS 3202 were prepared. The intermediate film was sandwiched between two clear float glasses, and pre-bonded under conditions of 10 minutes, 100 ° C., and 100 kPa. Thereafter, the pressure was increased to 1.3 MPa over 10 minutes and heated to 140 ° C. over 30 minutes, followed by pressure bonding for 20 minutes at 140 ° C. and 1.3 MPa pressure. Thereafter, the temperature was lowered to 32 ° C. over 40 minutes under a pressurized condition of 1.3 MPa, and then the pressure was reduced to 0 MPa over 10 minutes to produce a laminated glass.

(Examples 2-11 and Comparative Examples 1-3)
An interlayer film and a laminated glass were obtained in the same manner as in Example 1 except that the composition of the interlayer film was changed as shown in Tables 1 and 2 below.

(Evaluation)
(1) Glass transition temperature Immediately after the obtained interlayer film was stored in an environment of room temperature 23 ± 2 ° C. and humidity 25 ± 5% for 12 hours, a dynamic viscoelasticity measuring device “DVA-” manufactured by IT Measurement Co., Ltd. was used. 200 "was used to measure the tensile storage modulus. The interlayer film was cut out at a length of 30 mm and a width of 5 mm, and measured under the conditions of increasing the temperature from −50 to 150 ° C. at a rate of temperature increase of 5 ° C./min in the tensile mode, and the frequency of 1 Hz and the strain of 0.08%. . The glass transition temperature of the polyvinyl acetal resin (the glass transition temperature of the component derived from the polyvinyl acetal resin) was evaluated.

(2) 1st heat resistance test: 2000 hours The following 1st heat resistance test: 2000 hours was implemented based on JISK7373, and the YI value after a 1st heat resistance test was evaluated.

  First heat resistance test: 2000 hours; The laminated glass was put in an oven at 100 ° C., and after 2000 hours, the laminated glass was taken out from the oven, and the YI value was evaluated after the surface temperature of the laminated glass reached 23 ° C.

  Further, the second heat resistance test in which the heating time in the first heat resistance test was changed from 2000 hours to 3000 hours: 3000 hours was also performed, and the YI value was evaluated.

  Further, the third heat resistance test in which the heating time in the first heat resistance test was changed from 2000 hours to 1000 hours: 1000 hours were also performed, and the YI value was evaluated.

  Details and results are shown in Tables 1 and 2 below.

  Among the examples and comparative examples, in Example 1, the value A represented by the formula (X) was specifically calculated as follows. The same calculation can be performed in other examples and comparative examples.

1) Calculation of mole fraction of each (meth) acrylic monomer First, the number of moles of all (meth) acrylic monomers used is determined from the following formula (Y). (Rounded to the fourth decimal place. The same shall apply hereinafter)
Number of moles = blending amount (part by weight) / molecular weight (Y)
Number of moles of 2-ethylhexyl acrylate (molecular weight: 184): 98.7 / 184 = 0.536
Number of moles of benzyl acrylate (molecular weight: 162): 25.65 / 162 = 0.158
Number of moles of isobornyl acrylate (molecular weight 208): 22.65 / 208 = 0.109
Number of moles of tripropylene glycol diacrylate (molecular weight 300): 3.00 / 300 = 0.010

2) Next, the total number of moles of the second resin is obtained from the sum of the number of moles of the respective acrylic monomers.
Total number of moles of second resin: 0.536 + 0.158 + 0.109 + 0.010 = 0.814

3) Next, the number of carbon atoms of each acrylic monomer in the second resin component is determined from the following formula (Z).
Number of carbon atoms of each acrylic monomer × Total number of moles of second resin (0.813) × Mole fraction of each acrylic monomer × Avocado constant (6.022 × 10 ²³ ) / 100 = Number of carbon atoms of each acrylic monomer X number of moles of each acrylic monomer x Avogadro constant (6.022 x 10 ²³ ) / 100 (Z)
2-ethylhexyl acrylate (11 carbon atoms): 11 × 0.536 × 6.022 × 10 ²³ benzyl acrylate (5 carbon atoms): 5 × 0.158 × 6.022 × 10 ²³ = isobornyl acrylate (The number of carbon atoms 13): 13 × 0.109 × 6.002 × 10 ²³
Tripropylene glycol diacrylate (14 carbon atoms): 14 × 0.010 × 6.022 × 10 ²³

4) Next, from the sum of the number of carbon atoms that are not aromatic groups and the number of aromatic groups in each acrylic monomer, the number of carbon atoms that are not aromatic groups in the second resin component and the fragrance The total number (the total number of carbon atoms in which the aromatic group is regarded as 1 carbon atom) with the number of group groups is obtained.
(11 × 0.536 + 5 × 0.158 + 13 × 0.109 + 14 × 0.010) 6.022 × 10 ²³ = 8.043 × 6.022 × 10 ²³

5) Next, the number of tertiary carbon atoms or the number of aromatic groups of each acrylic monomer is determined from the following formula (α).
(Tertiary carbon atoms, or phenyl groups) × the total number of moles of the second resin (0.813) × mole fraction ^{× 6.022 × 10 23/100 =} ( tertiary carbon atoms, or phenyl radix) × number of moles × each acrylic monomer ^{6.022 × 10 23/100 ... (} α)
2-ethylhexyl acrylate (tertiary carbon atom number 1): 1 × 0.536 × 6.022 × 10 ²³
Benzyl acrylate (1 aromatic group): 1 × 0.158 × 6.022 × 10 ²³ Isobornyl acrylate (1 tertiary carbon atom): 1 × 0.109 × 6.022 × 10 ²³

6) Next, the sum of the number of tertiary carbon atoms and the number of aromatic groups is divided by the total number of carbon atoms (the total number of carbon atoms in which the aromatic group is regarded as 1 carbon atom) and multiplied by 100 to obtain the value A .
Value A = {(0.536 + 0.158 + 0.109) × 6.022 × 10 ²³ /(8.243×6.022×10 ²³ )} × 100 = 9.7%

DESCRIPTION OF SYMBOLS 1 ... 1st layer 1a ... 1st surface 1b ... 2nd surface 2 ... 2nd layer 2a ... Outer surface 3 ... 3rd layer 3a ... Outer surface 11 ... Intermediate film 11A ... Intermediate film (1st 1 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 (7)

Including a polyvinyl acetal resin and a second resin other than the polyvinyl acetal resin,
The following 1st heat resistance test based on JISK7373: The interlayer film for laminated glasses whose YI value after a 1st heat resistance test is 3.5 or less when 2000 hours are carried out.
First heat resistance test: 2000 hours; An intermediate film having a length of 10 cm and a width of 10 cm is prepared. Two sheets of 1 mm clear float glass in accordance with JIS 3202 are prepared. The intermediate film is sandwiched between two clear float glasses, and pre-bonding is performed for 10 minutes under the conditions of 100 ° C. and 100 kPa pressure. Thereafter, pressurization to 1.3 MPa over 10 minutes and heating to 140 ° C. over 30 minutes, followed by pressure bonding under conditions of pressures of 140 ° C. and 1.3 MPa over 20 minutes. Thereafter, the temperature is lowered to 32 ° C. over 40 minutes under a pressurized condition of 1.3 MPa, and then the pressure is reduced to 0 MPa over 10 minutes to obtain a test piece. The test piece is put into an oven at 100 ° C., and after 2000 hours, it is taken out from the oven, and the surface temperature of the test piece is set to 23 ° C. The YI value of the test piece is measured at a position of 5 cm in the horizontal direction and 2 cm in the vertical direction from the end of the test piece to the inside.   The interlayer film for laminated glass according to claim 1, wherein the content of the second resin is 40 wt% or more and 80 wt% or less in a total of 100 wt% of the polyvinyl acetal resin and the second resin. .   The interlayer film for laminated glass according to claim 1 or 2, wherein the second resin is a (meth) acrylic polymer. The material of the (meth) acrylic polymer is a plurality of (meth) acrylic monomers,
The interlayer film for laminated glass according to claim 3, wherein a value A represented by the following formula (X) is 3.5% or more.
Value A = N (Ar) + N (C3) (X)
N (Ar) = (Σni (Ar) × αi) / (Σni (C) × αi) × 100
N (C3) = (Σni (C3) × αi) / (Σni (C) × αi) × 100
N (Ar): Ratio of the number of aromatic groups having no electron-donating group as a substituent with respect to the total number of carbon atoms of the (meth) acrylic monomer used as the second resin material in the second resin N (C3): ratio of the number of tertiary carbon atoms to the number of all carbon atoms of the (meth) acrylic monomer used as the material of the second resin in the second resin ni (Ar): second Number of aromatic groups having no electron-donating group of (meth) acrylic monomer i used as a material for the second resin in the resin as a substituent ni (C3): of the second resin in the second resin Number of tertiary carbon atoms of (meth) acrylic monomer i used as material ni (C): not an aromatic group of (meth) acrylic monomer i used as material of second resin in second resin Sum of the number of carbon atoms and the number of aromatic groups Αi: molar fraction of the (meth) acrylic monomer i used as the material of the second resin in the second resin when the second resin is 100 mol% The (meth) acrylic monomer i is All the (meth) acrylic monomers used as the material for the second resin in the resin No. 2 are represented, and Σ represents the sum for all the (meth) acrylic monomers i. The following 2nd heat resistance test based on JISK7373: YI value after a 2nd heat resistance test is 4.0 or less when 3000 hours are carried out, The any one of Claims 1-4. An interlayer film for laminated glass as described in 1.
Second heat resistance test: 3000 hours; heat resistance test in which the heating time in the first heat resistance test was changed from 2000 hours to 3000 hours   The interlayer film for laminated glass according to any one of claims 1 to 5, comprising a plasticizer. A first laminated glass member;
A second laminated glass member;
An interlayer film for laminated glass according to any one of claims 1 to 6,
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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