JP2013006723A - Interlayer film for laminated glass and laminated glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interlayer film for laminated glass capable of giving a laminated glass having excellent heat-shielding property and suppressing generation of bubbles and growth of bubbles.SOLUTION: The interlayer film 1 for laminated glass is provided with first and second layers 2, 3 containing a polyvinyl acetal resin and a plasticizer. The first layer 2 or the second layer 3 of the interlayer film 1 contains an infrared absorber. The content of a hydroxyl group of the polyvinyl acetal resin in the first layer 2 is smaller than the content of the hydroxyl group of the polyvinyl acetal resin in the second layer 3. The difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer 2 and the hydroxyl group content of the polyvinyl acetal resin in the second layer 3 is ≤9.2 mol%. When the content difference is >8.5 mol% and ≤9.2 mol%, the acetylation degree of the polyvinyl acetal resin in the first layer 2 is ≤8 mol%.

Description

  The present invention relates to an interlayer film for laminated glass having a multilayer structure of at least two layers, and more specifically, an interlayer film for laminated glass in which each layer contains a polyvinyl acetal resin and a plasticizer, respectively, and the interlayer film for laminated glass It is related with the laminated glass using.

  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 a pair of 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 30 parts by weight or more of a plasticizer is disclosed. This sound insulation layer may be a single layer and used as an intermediate film.

  Furthermore, the following Patent Document 1 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 of 30 parts by weight or less are included.

JP 2007-070200 A

  When the laminated glass is formed using the interlayer film described in Patent Document 1, the sound insulation in the frequency region near 2000 Hz of the laminated glass is not sufficient, and therefore the sound insulation performance is inevitably lowered due to the coincidence effect. There is. In particular, the sound insulation properties at around 20 ° C. of this laminated glass may not be sufficient.

  Here, the coincidence effect means that when a sound wave is incident on the glass plate, the transverse wave propagates on the glass surface due to the rigidity and inertia of the glass plate, and the transverse wave and the incident sound resonate. This is a phenomenon that occurs.

  In addition, when a laminated glass is formed using a multilayer interlayer film in which the sound insulating layer described in Patent Document 1 and other layers are laminated, the sound insulating property in the vicinity of 20 ° C. of the laminated glass can be increased to some extent. it can. However, since the multilayer interlayer film has the sound insulating layer, foaming may occur in the laminated glass using the multilayer interlayer film.

  Furthermore, in recent years, in order to improve the sound insulation of the laminated glass, it has been studied to increase the content of the plasticizer in the interlayer film. When the content of the plasticizer in the interlayer film is increased, the sound insulation of the laminated glass can be improved. However, when the plasticizer content is increased, foaming may occur in the laminated glass.

  Furthermore, when a laminated glass is formed using a conventional interlayer film for laminated glass, there is a problem that the heat shielding property of the laminated glass is low.

  An object of the present invention is to provide an interlayer film for laminated glass that is excellent in heat-shielding properties and that can obtain a laminated glass capable of suppressing the occurrence of foaming and the growth of foam, and a laminated glass using the interlayer film for laminated glass. Is to provide.

  A limited object of the present invention is to provide an interlayer film for laminated glass capable of obtaining a laminated glass excellent in sound insulation, and a laminated glass using the interlayer film for laminated glass.

  According to a wide aspect of the present invention, a first layer containing a polyvinyl acetal resin and a plasticizer is laminated on one surface of the first layer, and contains a polyvinyl acetal resin and a plasticizer. And the first layer contains an infrared absorber, or the second layer contains an infrared absorber, and the polyvinyl acetal resin in the first layer is 100 weight by weight. The content of the plasticizer with respect to part is 50 parts by weight or more, and the hydroxyl group content of the polyvinyl acetal resin in the first layer is the hydroxyl group content of the polyvinyl acetal resin in the second layer. The difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer is 9.2 mol% or less. ,the above The difference between the hydroxyl group content of the polyvinyl acetal resin in the layer 1 and the hydroxyl group content of the polyvinyl acetal resin in the second layer is more than 8.5 mol% and not more than 9.2 mol% In this case, an interlayer film for laminated glass is provided in which the degree of acetylation of the polyvinyl acetal resin in the first layer is 8 mol% or less.

  The second layer preferably contains the infrared absorber. It is preferable that the infrared absorber contains heat shielding particles. The infrared absorber preferably contains metal oxide particles.

  In a specific aspect of the interlayer film for laminated glass according to the present invention, the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer Is a difference of 9.2 mol% or less, and the difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer is , 8.5 mol% or less, the degree of acetylation of the polyvinyl acetal resin in the first layer exceeds 8 mol%.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, the polyvinyl acetal resin in the first layer has an acetylation degree of 8 mol% or less and a hydroxyl group content of less than 31.5 mol%. is there.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, the degree of acetylation of the polyvinyl acetal resin in the first layer is 8 mol% or less, and the degree of acetalization is 68 mol% or more.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, the content of hydroxyl groups in the polyvinyl acetal resin in the first layer is less than 31.5 mol%, and the degree of acetalization is 68 mol% or more. is there.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer. Is not more than 8.5 mol%, the degree of acetylation of the polyvinyl acetal resin in the first layer is more than 8 mol% and less than 20 mol%.

  In still another specific aspect of the interlayer film for laminated glass according to the present invention, the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer. When the difference from the rate is 8.5 mol% or less, the degree of acetylation of the polyvinyl acetal resin in the first layer exceeds 8 mol%, and the degree of acetalization is 52.5 mol% or more. It is.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer. Is 8.5 mol% or less, the degree of acetylation of the polyvinyl acetal resin in the first layer exceeds 8 mol%, and the hydroxyl group content is 28 mol% or less. .

  In still another specific aspect of the interlayer film for laminated glass according to the present invention, the polyvinyl acetal resin in the first layer is obtained by acetalizing polyvinyl alcohol having a degree of polymerization of more than 1700 and 3000 or less. It is a polyvinyl acetal resin obtained.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, the hydroxyl group content of the polyvinyl acetal resin in the second layer is 33 mol% or less.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is the polyvinyl acetal in the second layer. The content of the plasticizer is more than 100 parts by weight of the resin.

  In still another specific aspect of the interlayer film for laminated glass according to the present invention, the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is the polyvinyl in the second layer. The amount of the plasticizer is 20 parts by weight or more than 100 parts by weight of the acetal resin.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer. Is 8.5 mol% or less.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, a third layer that is laminated on the other surface of the first layer and contains a polyvinyl acetal resin and a plasticizer is further provided. The hydroxyl content of the polyvinyl acetal resin in the first layer is lower than the hydroxyl content of the polyvinyl acetal resin in the third layer; The difference between the hydroxyl group content of the polyvinyl acetal resin and the hydroxyl group content of the polyvinyl acetal resin in the third layer is 9.2 mol% or less, and the polyvinyl acetal resin in the first layer is not more than 9.2 mol%. When the difference between the hydroxyl group content in the third layer and the hydroxyl group content in the polyvinyl acetal resin in the third layer is more than 8.5 mol% and 9.2 mol% or less, the first In the layer Serial acetylation degree of polyvinyl acetal resin is not more than 8 mol%. The third layer preferably contains an infrared absorber.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the third layer. And the difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the third layer is 9.2 mol% or less. However, when it is 8.5 mol% or less, the acetylation degree of the polyvinyl acetal resin in the first layer exceeds 8 mol%.

  In still another specific aspect of the interlayer film for laminated glass according to the present invention, the hydroxyl group content of the polyvinyl acetal resin in the third layer is 33 mol% or less.

  In still another specific aspect of the interlayer film for laminated glass according to the present invention, the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is in the second and third layers. The content of the plasticizer is more than 100 parts by weight of the polyvinyl acetal resin.

  The interlayer film for laminated glass according to the present invention preferably contains a polyvinyl butyral resin as the polyvinyl acetal resin contained in the first to third layers. The interlayer film for laminated glass according to the present invention preferably contains triethylene glycol di-2-ethylhexanoate as the plasticizer contained in the first to third layers.

  The laminated glass according to the present invention comprises first and second laminated glass constituent members and an intermediate film sandwiched between the first and second laminated glass constituent members, and the intermediate film comprises: 1 is an interlayer film for laminated glass constructed according to the present invention.

  The interlayer film for laminated glass according to the present invention includes a first layer containing a polyvinyl acetal resin and a plasticizer, laminated on one surface of the first layer, and a polyvinyl acetal resin and a plasticizer. Since the said 1st layer or the said 2nd layer contains an infrared absorber, the heat-shielding property of the laminated glass using an intermediate film can be improved.

  Furthermore, the interlayer film for laminated glass according to the present invention includes the first and second layers, and the content of the hydroxyl group of the polyvinyl acetal resin in the first layer is higher than that in the second layer. Lower than the content of each hydroxyl group in the polyvinyl acetal resin, the plasticizer content in 100 parts by weight of the polyvinyl acetal resin in the first layer is 50 parts by weight or more, and in the first layer The difference between the hydroxyl group content of the polyvinyl acetal resin and the hydroxyl group content of the polyvinyl acetal resin in the second layer is 9.2 mol% or less. When the difference between the hydroxyl group content of the polyvinyl acetal resin and the hydroxyl group content of the polyvinyl acetal resin in the second layer is more than 8.5 mol% and 9.2 mol% or less, Since acetylation degree of the polyvinyl acetal resin of the serial first layer is 8 mol% or less, it is possible to suppress the generation and growth of the foam of the foam in the laminated glass using the interlayer film.

FIG. 1 is a cross-sectional view schematically showing an interlayer film for laminated glass according to an embodiment of the present invention. FIG. 2 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 clarified by giving specific embodiments and examples of the present invention with reference to the drawings.

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

  The intermediate film 1 shown in FIG. 1 includes a first layer 2, a second layer 3 stacked on one surface 2 a (first surface) of the first layer 2, and the other of the first layer 2. And a third layer 4 laminated on the surface 2b (second surface). The intermediate film 1 is used to obtain a laminated glass. The intermediate film 1 is an intermediate film for laminated glass. The intermediate film 1 is a multilayer intermediate film.

  The first layer 2 is disposed between the second layer 3 and the third layer 4, and is sandwiched between the second layer 3 and the third layer 4. In the present embodiment, the first layer 2 is an intermediate layer, and the second and third layers 3 and 4 are surface layers. However, the second and third layers 3 and 4 are intermediate layers, and other interlayer films for laminated glass are further laminated on the outer surfaces 3a and 4a of the second and third layers 3 and 4. May be.

Each of the first to third layers 2 to 4 contains a polyvinyl acetal resin and a plasticizer.
Moreover, in the intermediate film 1, the 1st layer 2 contains an infrared absorber, or the 2nd layer 3 contains an infrared absorber. Only the first layer 2 may contain an infrared absorber, only the second layer 3 may contain an infrared absorber, both the first layer 2 and the second layer 3. May contain an infrared absorber. The third layer 4 may or may not contain an infrared absorber. The first layer 2 that is an intermediate layer is relatively thin, and thickness variations are likely to occur. The second and third layers 3 and 4 which are surface layers are relatively thicker than the first layer 2 and thickness variations are less likely to occur. For this reason, by using an infrared absorber for the second and third layers 3 and 4, the heat shielding property can be made uniform and good. In addition, when the first layer 2 is thinner than the second layer 3 or the first layer 2 is thinner than the third layer 4, the second and third layers 3 and 4 are irradiated with infrared rays. By using the absorbent, the heat shielding uniformity is increased.

  That is, the main feature of the present invention is that the first layer 2 contains an infrared absorber or the second layer 3 contains an infrared absorber. Thereby, the heat shielding property of the laminated glass of the intermediate film can be enhanced.

  Furthermore, another main feature of this embodiment is that the hydroxyl group content of the polyvinyl acetal resin in the first layer 2 is higher than the hydroxyl group content of the polyvinyl acetal resin in the second layer 3. The difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer 2 and the hydroxyl group content of the polyvinyl acetal resin in the second layer 3 (hereinafter referred to as a content difference (1-2)) is low. May be described) is 9.2 mol% or less, and further, the hydroxyl group content of the polyvinyl acetal resin in the first layer 2 and the hydroxyl group content of the polyvinyl acetal resin in the second layer 3. Acetylation of the polyvinyl acetal resin in the first layer 2 when the difference from the ratio (content difference (1-2)) is more than 8.5 mol% and 9.2 mol% or less. The degree is 8 mol% or lessIn the present embodiment, the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer 2 is 50 parts by weight or more. The content difference (1-2) may exceed 8.5 mol% and may be 9.2 mol% or less, and may be 8.5 mol% or less.

  In the present embodiment, the hydroxyl content of the polyvinyl acetal resin in the first layer 2 is lower than the hydroxyl content of the polyvinyl acetal resin in the third layer 4. There is a difference between the hydroxyl group content of the polyvinyl acetal resin in the inside and the hydroxyl group content of the polyvinyl acetal resin in the third layer 4 (hereinafter sometimes referred to as a content rate difference (1-3)). 9.2 mol% or less, and the difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer 2 and the hydroxyl group content of the polyvinyl acetal resin in the third layer 4 (content rate) When the difference (1-3)) exceeds 8.5 mol% and is 9.2 mol% or less, the degree of acetylation of the polyvinyl acetal resin in the first layer 2 is 8 mol% or less. Preferably there is. However, even when the content difference (1-3) is 8.5 mol% or less, the content difference (1-2) exceeds 8.5 mol% and is 9.2 mol% or less. The degree of acetylation of the polyvinyl acetal resin in the first layer 2 is 8 mol% or less. The content difference (1-3) exceeds 8.5 mol%, may be 9.2 mol% or less, and may be 8.5 mol% or less.

  The polyvinyl acetal in the first layer 2 when the content difference (1-2) and the content difference (1-3) exceed 8.5 mol% and 9.2 mol% or less, respectively. The degree of acetylation of the resin is limited to 8 mol% or less, together with the difference in content (1-2) and the difference in content (1-3), together with the acetylation of the polyvinyl acetal resin in the first layer 2 This is because when the degree is increased, the effect of suppressing the occurrence of foaming and growth of the laminated glass tends to be reduced. On the other hand, if the content difference (1-2) and the content difference (1-3) are 8.5 mol% or less, the degree of acetylation of the polyvinyl acetal resin in the first layer 2 is 8 mol%. Even if it exceeds, generation | occurrence | production and the growth of foaming of a laminated glass can be suppressed.

  In the interlayer film for laminated glass having a multilayer structure, the present inventors have found that a plasticizer migrates between the respective layers, and as a result, a layer having a high plasticizer content is formed. It was found that the plasticizer migrated from the first layer to the first layer, and as a result, the plasticizer content in the first layer increased. Furthermore, when a layer having a high plasticizer content is formed, that is, when the content of the plasticizer in the first layer is increased, foaming is likely to occur in the laminated glass using the interlayer film for laminated glass, and further foaming occurs. It has also been found that once foaming occurs, foaming grows with the resulting foaming as a nucleus.

  As a result of intensive studies to suppress the occurrence of foaming and the growth of foam, the present inventors have controlled the content of each hydroxyl group of the polyvinyl acetal resin in the first to third layers as described above. It has also been found that the occurrence of foaming and the growth of foaming in the laminated glass can be sufficiently suppressed. Since the migration of the plasticizer can be suppressed and the occurrence of foaming and the growth of foaming in the laminated glass can be sufficiently suppressed, the plasticizer content in each layer, particularly the plasticizer content in the first layer 2 should be increased. Can do. For this reason, the sound insulation of a laminated glass can be improved.

  From the viewpoint of further suppressing the occurrence of foaming and the growth of foaming in the laminated glass, the hydroxyl group content of the polyvinyl acetal resin in the first layer 2 and the polyvinyl in the second and third layers 3 and 4. The preferable lower limit of the difference from the content of each hydroxyl group of the acetal resin (content difference (1-2) and content difference (1-3)) is 0.1 mol%, more preferably the lower limit is 1 mol%, and still more preferable. The lower limit is 2 mol%, the preferred upper limit is 8.5 mol%, the more preferred upper limit is 7.8 mol%, the still more preferred upper limit is 7 mol%, and the particularly preferred upper limit is 5.6 mol%. Since the occurrence of foaming and the growth of foaming in the laminated glass can be further suppressed, the hydroxyl group content of the polyvinyl acetal resin in the first layer 2 and the above in the second and third layers 3 and 4 The difference (content ratio difference (1-2) and content ratio difference (1-3)) from the content of each hydroxyl group in the polyvinyl acetal resin is preferably 5 mol% or less, more preferably 4.5 mol% or less, and more. More preferably, it is 4 mol% or less, More preferably, it is 3.5 mol% or less.

  Moreover, when the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer 2 is 55 parts by weight or more, the sound insulation of the laminated glass can be sufficiently enhanced. When the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer 2 is 60 parts by weight or more, the sound insulation of the laminated glass can be further enhanced.

  Hereinafter, the detail of each component contained in the said 1st-3rd layer of an intermediate film is demonstrated.

(Polyvinyl acetal resin)
When the first to third layers each contain a polyvinyl acetal resin and a plasticizer, the adhesive strength of the first to third layers can be increased. For this reason, the adhesive force of the intermediate film with respect to the laminated glass constituent member can be further increased.

  The polyvinyl acetal resin can be produced, for example, by acetalizing polyvinyl alcohol with an aldehyde. The polyvinyl alcohol can be obtained, for example, by saponifying polyvinyl acetate. The saponification degree of the polyvinyl alcohol is generally in the range of 70 to 99.9 mol%, and preferably in the range of 80 to 99.8 mol%.

  The degree of polymerization of the polyvinyl alcohol is preferably 200 or more, more preferably 500 or more, more preferably 3000 or less, and still more preferably 2800 or less. When the said polymerization degree satisfy | fills the said preferable minimum, the penetration resistance of a laminated glass can be improved further. When the said polymerization degree satisfy | fills the said preferable upper limit, shaping | molding of an intermediate film will become easy. The polyvinyl acetal resin in the first layer is preferably a polyvinyl acetal resin obtained by acetalizing polyvinyl alcohol having a degree of polymerization of more than 1700 and 3000 or less. The degree of polymerization indicates an average degree of polymerization.

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

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

  The polyvinyl acetal resin is preferably a polyvinyl butyral resin. The interlayer film for laminated glass according to the present invention preferably contains a polyvinyl butyral resin as the polyvinyl acetal resin contained in the first to third layers. Synthesis of polyvinyl butyral resin is easy. Furthermore, the use of the polyvinyl butyral resin allows the intermediate film to have a more appropriate adhesive force with respect to the laminated glass component. Furthermore, light resistance, weather resistance, etc. can be further improved.

  The preferred lower limit of the hydroxyl group content (hydroxyl content) of the polyvinyl acetal resin contained in the first layer as the intermediate layer is 20 mol%, more preferred lower limit is 22 mol%, still more preferred lower limit is 23 mol%, A particularly preferred lower limit is 25 mol%, a preferred upper limit is 30 mol%, a more preferred upper limit is 28 mol%, a still more preferred upper limit is 27 mol%, and a particularly preferred upper limit is 26 mol%. When the hydroxyl group content satisfies the preferable lower limit, the adhesive strength of the first layer can be further increased. When the hydroxyl group content satisfies the preferable upper limit, the sound insulating properties of the laminated glass can be further enhanced. Furthermore, the flexibility of the intermediate film is increased, and the handleability of the intermediate film can be further enhanced.

  In addition, when the content rate of the hydroxyl group of polyvinyl acetal resin is low, the hydrophilic property of polyvinyl acetal resin will become low. For this reason, content of a plasticizer can be increased and as a result, the sound insulation of a laminated glass can be made still higher. The content ratio of the hydroxyl group of the polyvinyl acetal resin in the first layer is lower than the content ratio of each hydroxyl group of the polyvinyl acetal resin in the second and third layers. The content of the agent can be increased.

  The preferred lower limit of the hydroxyl group content of the polyvinyl acetal resin contained in the second and third layers as the surface layer is 26 mol%, more preferred lower limit is 27 mol%, and still more preferred lower limit is 28 mol%, A particularly preferred lower limit is 29 mol%, a preferred upper limit is 35 mol%, a more preferred upper limit is 33 mol%, a still more preferred upper limit is 32 mol%, and a particularly preferred upper limit is 31.5 mol%. When the hydroxyl group content satisfies the preferable lower limit, the adhesive strength of the intermediate film can be further increased. When the hydroxyl group content satisfies the preferable upper limit, the flexibility of the intermediate film is increased, and the handleability of the intermediate film can be further enhanced.

  The content of hydroxyl groups in the polyvinyl acetal resin is a value obtained by dividing the amount of ethylene groups to which hydroxyl groups are bonded by the total amount of ethylene groups in the main chain, as a percentage (mol%). . The amount of ethylene group to which the hydroxyl group is bonded can be determined, for example, by measuring the amount of ethylene group to which the hydroxyl group of the polyvinyl acetal resin is bonded by a method based on JIS K6728 “Testing method for polyvinyl butyral”. it can.

  The degree of acetylation (acetyl group amount) of the polyvinyl acetal resin contained in the first layer is preferably 30 mol% or less. When the degree of acetylation exceeds 30 mol%, the reaction efficiency in producing a polyvinyl acetal resin may be reduced.

  The more preferable lower limit of the degree of acetylation of the polyvinyl acetal resin contained in the first layer is 0.1 mol%, the more preferable lower limit is 0.5 mol%, the still more preferable lower limit is 1 mol%, and the particularly preferable lower limit. Is 1.2 mol%, the preferable upper limit is 24 mol%, the more preferable upper limit is 20 mol%, the still more preferable upper limit is 16 mol%, and the particularly preferable upper limit is 15 mol%. The preferable lower limit of the degree of acetylation of the polyvinyl acetal resin contained in the second and third layers is 0.1 mol%, the more preferable lower limit is 0.5 mol%, and the still more preferable lower limit is 0.8 mol%. The preferred upper limit is 10 mol%, the more preferred upper limit is 5 mol%, the still more preferred upper limit is 2 mol%, and the particularly preferred upper limit is 1.5 mol%. When the acetylation degree satisfies the preferable lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer is further enhanced, and the glass transition temperature of the interlayer film can be sufficiently lowered. When the acetylation degree satisfies the preferable upper limit, the moisture resistance of the intermediate film can be further enhanced.

  Since the sound insulation of the laminated glass can be further enhanced, the degree of acetylation of the polyvinyl acetal resin contained in the first layer is determined by the polyvinyl acetal contained in the second and third layers. More than the degree of acetylation of the resin.

  The degree of acetylation is obtained by subtracting the amount of ethylene groups to which acetal groups are bonded and the amount of ethylene groups to which hydroxyl groups are bonded from the total amount of ethylene groups of the main chain, This is a value expressed as a percentage (mol%) of the mole fraction obtained by dividing by. The amount of ethylene group to which the acetal group is bonded can be measured, for example, according to JIS K6728 “Testing method for polyvinyl butyral”.

  The preferable lower limit of the degree of acetalization of the polyvinyl acetal resin contained in the first layer is 45 mol%, the more preferable lower limit is 52.5 mol%, the still more preferable lower limit is 58 mol%, and the particularly preferable lower limit is 60 mol%. The preferred upper limit is 85 mol%, the more preferred upper limit is 80 mol%, the still more preferred upper limit is 77 mol%, and the particularly preferred upper limit is 75 mol%. The preferable lower limit of the degree of acetalization of the polyvinyl acetal resin contained in the second and third layers is 61 mol%, the more preferable lower limit is 65 mol%, the still more preferable lower limit is 67 mol%, and the preferable upper limit is 72 mol%. A more preferred upper limit is 71 mol%, and a still more preferred upper limit is 70 mol%. When the said acetalization degree satisfy | fills the said preferable minimum, the compatibility of polyvinyl acetal resin and a plasticizer becomes still higher, and the glass transition temperature of an intermediate film can fully be reduced. When the said acetalization degree satisfy | fills the said preferable upper limit, reaction time required in order to manufacture polyvinyl acetal resin can be shortened.

  The degree of acetalization is a value obtained by dividing the amount of ethylene groups to which acetal groups are bonded by the total amount of ethylene groups in the main chain, and expressed as a percentage (mol%).

  The degree of acetalization was determined by measuring the amount of acetyl groups and the amount of vinyl alcohol (hydroxyl content) by a method based on JIS K6728 “Testing methods for polyvinyl butyral”, and calculating the mole fraction from the obtained measurement results. Then, it can be calculated by subtracting the amount of acetyl groups and the amount of vinyl alcohol from 100 mol%.

  In order to suppress the occurrence of foaming and the growth of foam, by controlling the hydroxyl group content of the first to third layers as described above, the occurrence of foaming and the growth of foam in the laminated glass are sufficiently achieved. Can be suppressed. Since the migration of the plasticizer can be suppressed, the occurrence of foaming and the growth of foaming in the laminated glass can be sufficiently suppressed, and the sound insulating properties of the laminated glass can be enhanced.

  Since the transition of the plasticizer can be easily controlled and the sound insulation of the laminated glass can be further enhanced, when the content difference (1-2) is 8.5 mol% or less, the first It is preferable that the degree of acetylation of the polyvinyl acetal resin in the layer exceeds 8 mol%. Since the transition of the plasticizer can be easily controlled and the sound insulation of the laminated glass can be further enhanced, when the content difference (1-3) is 8.5 mol% or less, the first It is preferable that the degree of acetylation of the polyvinyl acetal resin in the layer exceeds 8 mol%.

  Since the transition of the plasticizer can be easily controlled and the sound insulating properties of the laminated glass can be further enhanced, the content difference (1-2) is more than 8.5 mol% and not more than 9.2 mol%. In some cases or when the content difference (1-2) is 9.2 mol% or less, the degree of acetalization of the polyvinyl acetal resin in the first layer is 68 mol% or more, Or it is preferable that the content rate of a hydroxyl group is less than 31.5 mol%. Since the transition of the plasticizer can be easily controlled and the sound insulating properties of the laminated glass can be further enhanced, the content difference (1-3) exceeds 8.5 mol% and is 9.2 mol% or less. In some cases or when the content difference (1-3) is 9.2 mol% or less, the degree of acetalization of the polyvinyl acetal resin in the first layer is 68 mol% or more, Or it is preferable that the content rate of a hydroxyl group is less than 31.5 mol%.

  Furthermore, since the migration of the plasticizer can be easily controlled and the sound insulation of the laminated glass can be further enhanced, the degree of acetylation of the polyvinyl acetal resin contained in the first layer is 8 mol% or less. In the case (hereinafter, also referred to as “polyvinyl acetal resin A”), the content difference (1-2) and the content difference (1-3) are preferably 9.2 mol% or less. When the degree of acetylation of the polyvinyl acetal resin contained in the first layer exceeds 8 mol% (hereinafter, also referred to as “polyvinyl acetal resin B”), the difference in content (1-2) and The content difference (1-3) is 9.2 mol% or less, and preferably 8.5 mol% or less.

  The upper limit of the degree of acetylation a of the polyvinyl acetal resin A is 8 mol%, the preferable upper limit is 7 mol%, the more preferable upper limit is 6 mol%, the still more preferable upper limit is 5 mol%, and the preferable lower limit is 0.1 mol%. A preferred lower limit is 0.5 mol%, a more preferred lower limit is 0.8 mol%, and a particularly preferred lower limit is 1 mol%. When the acetylation degree a is not more than the above upper limit and not less than the above lower limit, the migration of the plasticizer can be easily controlled, and the sound insulation of the laminated glass can be further enhanced.

  A preferable lower limit of the degree of acetalization a of the polyvinyl acetal resin A is 68 mol%, a more preferable lower limit is 70 mol%, a further preferable lower limit is 71 mol%, a particularly preferable lower limit is 72 mol%, and a preferable upper limit is 85 mol%. A preferred upper limit is 83 mol%, a more preferred upper limit is 81 mol%, and a particularly preferred upper limit is 79 mol%. When the acetalization degree a is not less than the above lower limit, the sound insulation of the laminated glass can be further enhanced. When the acetalization degree a is not more than the above upper limit, the reaction time necessary for producing the polyvinyl acetal resin A can be shortened.

  The hydroxyl group content a of the polyvinyl acetal resin A is preferably less than 31.5 mol%, more preferably 31 mol% or less, still more preferably 29 mol% or less, still more preferably 28 mol% or less, preferably 20 mol. % Or more, more preferably 21 mol% or more, still more preferably 22 mol% or more, and particularly preferably 24 mol% or more. When the hydroxyl group content a is not more than the above upper limit, the sound insulation of the laminated glass can be further enhanced. When the hydroxyl group content a is equal to or higher than the lower limit, the adhesive strength of the intermediate film can be further increased.

  The polyvinyl acetal resin A is preferably a polyvinyl butyral resin.

  The degree of acetylation b of the polyvinyl acetal resin B exceeds 8 mol%, the preferable lower limit is 10 mol%, the more preferable lower limit is 11 mol%, the still more preferable lower limit is 12 mol%, and the particularly preferable lower limit is 15 mol%, preferably. The upper limit is 30 mol%, the more preferable upper limit is 28 mol%, the still more preferable upper limit is 26 mol%, and the particularly preferable upper limit is 19.5 mol%. When the acetylation degree b is not less than the above lower limit, the sound insulation of the laminated glass can be further enhanced. When the acetylation degree b is not more than the above upper limit, the reaction time required for producing the polyvinyl acetal resin B can be shortened. Especially, since reaction time required in order to manufacture polyvinyl acetal resin B can be shortened further, it is preferable that the acetylation degree b of the said polyvinyl acetal resin B is less than 20 mol%. Moreover, since the generation | occurrence | production of foaming and the growth of foaming can further be suppressed in a laminated glass, it is preferable that the acetylation degree b of the polyvinyl acetal resin B is 25 mol% or less.

  The preferable lower limit of the degree of acetalization b of the polyvinyl acetal resin B is 45 mol%, the more preferable lower limit is 52.5 mol%, the still more preferable lower limit is 55 mol%, the particularly preferable lower limit is 60 mol%, and the preferable upper limit is 80 mol%. A more preferred upper limit is 77 mol%, a still more preferred upper limit is 74 mol%, and a particularly preferred upper limit is 71 mol%. When the acetalization degree b is equal to or higher than the lower limit, the sound insulation of the laminated glass can be further enhanced. When the acetalization degree b is not more than the above upper limit, the reaction time required for producing the polyvinyl acetal resin B can be shortened.

  The preferable upper limit of the hydroxyl group content b of the polyvinyl acetal resin B is 31.5 mol%, the more preferable upper limit is 30 mol%, the still more preferable upper limit is 29 mol%, the particularly preferable upper limit is 27.5 mol%, and the preferable lower limit is 22 mol%, a more preferred lower limit is 23 mol%, a still more preferred lower limit is 24 mol%, and a particularly preferred lower limit is 25 mol%. When the hydroxyl group content b is not more than the above upper limit, the sound insulation of the laminated glass can be further enhanced. When the hydroxyl group content b is not less than the above lower limit, the adhesive strength of the intermediate film can be further increased.

  As described above, when the content difference (1-2) or the content difference (1-3) exceeds 8.5 mol% and is 9.2 mol% or less, the first layer The acetylation degree of the said polyvinyl acetal resin in it is 8 mol% or less.

  When the content difference (1-2) or the content difference (1-3) is 8.5 mol% or less, first, the acetyl of the polyvinyl acetal resin in the first layer It is preferable that the degree of conversion exceeds 8 mol%. Regarding the polyvinyl acetal resin in the first layer, firstly, the degree of acetylation is preferably 8 mol% or less, and the hydroxyl group content is preferably less than 31.5 mol%, and secondly, The degree of acetylation is preferably 8 mol% or less and the degree of acetalization is preferably 68 mol% or more. Third, the hydroxyl group content is less than 31.5 mol% and the degree of acetalization is 68 mol% or more. Is preferred.

  When the content difference (1-2) or the content difference (1-3) is 8.5 mol% or less, the polyvinyl acetal resin in the first layer will be described first. The degree of acetylation is preferably more than 8 mol% and less than 20 mol%, and secondly, the degree of acetylation is more than 8 mol% and the degree of acetalization is preferably 52.5 mol% or more. Thirdly, it is preferable that the degree of acetylation exceeds 8 mol%, and the hydroxyl group content is 28 mol% or less.

  When the interlayer film for laminated glass according to the present invention includes the first, second and third layers, the hydroxyl group content of the polyvinyl acetal resin in the first layer is 31.5 mol. % And the degree of acetalization is preferably 68 mol% or more. It is preferable that the hydroxyl group content of the polyvinyl acetal resin in the second layer and the third layer is 33 mol% or less.

  The polyvinyl acetal resin B is preferably a polyvinyl butyral resin.

  The polyvinyl acetal resin A and the polyvinyl acetal resin B are obtained by acetalizing polyvinyl alcohol with an aldehyde. The aldehyde is preferably an aldehyde having 1 to 10 carbon atoms, and more preferably an aldehyde having 4 or 5 carbon atoms. Especially, it is preferable that the said polyvinyl acetal resin A and the said polyvinyl acetal resin B are polyvinyl acetal resins obtained by acetalizing the polyvinyl alcohol whose polymerization degree exceeds 1700 and is 3000 or less with an aldehyde. The preferable lower limit of the polymerization degree of the polyvinyl alcohol is 1800, more preferable lower limit is 2000, still more preferable lower limit is 2400, particularly preferable lower limit is 2500, preferable upper limit is 3000, more preferable upper limit is 2900, still more preferable upper limit is 2800, and particularly preferable upper limit. Is 2700. When the said polymerization degree satisfy | fills the said preferable minimum, the penetration resistance of a laminated glass can be improved further, and generation | occurrence | production of foaming and the growth of foaming in a laminated glass can be suppressed further. When the said polymerization degree satisfy | fills the said preferable upper limit, shaping | molding of an intermediate film will become easy.

(Plasticizer)
The plasticizer contained in each of the first to third layers is not particularly limited. A conventionally known plasticizer can be used as the plasticizer. As for the said plasticizer, only 1 type may be used and 2 or more types may be used together.

  Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and phosphate plasticizers such as organic phosphate plasticizers and organic phosphorous acid plasticizers. It is done. Of these, organic ester plasticizers are preferred. The plasticizer is preferably a liquid plasticizer.

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

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

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

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

  The plasticizer is preferably a diester plasticizer represented by the following formula (1). By using this diester plasticizer, the sound insulation of the laminated glass can be further enhanced.

  In said formula (1), R1 and R2 respectively represent a C5-C10 organic group, R3 represents an ethylene group, an isopropylene group, or n-propylene group, p represents the integer of 3-10. . R1 and R2 in the above formula (1) are each preferably an organic group having 6 to 10 carbon atoms.

  The plasticizer preferably contains a diester compound, and includes triethylene glycol di-2-ethylbutyrate (3GH), triethylene glycol di-2-ethylhexanoate (3GO), and triethylene glycol di-n-heptanoate. More preferably, it contains at least one selected from the group consisting of (3G7), and more preferably contains triethylene glycol di-2-ethylhexanoate. By using these preferable plasticizers, the sound insulation of the laminated glass can be further enhanced. The interlayer film for laminated glass according to the present invention particularly preferably contains triethylene glycol di-2-ethylhexanoate as the plasticizer contained in the first to third layers.

  The content of the plasticizer in each layer of the intermediate film is not particularly limited.

  From the viewpoint of sufficiently increasing the sound insulation of the laminated glass, the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is 50 parts by weight or more. Even if the content of the plasticizer in the first layer is large, since the hydroxyl group content in the first to third layers is controlled as described above, generation of foam and growth of foam in the laminated glass Can be suppressed.

  The lower limit of the plasticizer content relative to 100 parts by weight of the polyvinyl acetal resin in the first layer is 50 parts by weight, the preferred lower limit is 55 parts by weight, the more preferred lower limit is 60 parts by weight, and the preferred upper limit is 80 parts by weight. The upper limit is 75 parts by weight, and a more preferable upper limit is 70 parts by weight. When content of the said plasticizer satisfy | fills the said preferable minimum, the penetration resistance of a laminated glass can be improved further. As the content of the plasticizer in the first layer is larger, the sound insulation of the laminated glass can be further enhanced. When content of the said plasticizer satisfy | fills the said preferable upper limit, transparency of an intermediate film can be improved further. In order to sufficiently enhance the sound insulation of the laminated glass, the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is 50 parts by weight or more. The content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is preferably 50 parts by weight or more before the transition of the plasticizer (initial), and 50 parts by weight or more after the transition. May be. When 50 parts by weight of a plasticizer is blended with 100 parts by weight of the polyvinyl acetal resin in order to obtain the first layer, the content of the plasticizer in the first layer is generally increased. Tend. In particular, when the content of the hydroxyl group of the polyvinyl acetal resin in the first layer is low, in order to obtain 50 parts by weight of a plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in order to obtain the first layer, Generally, the content of the plasticizer in the first layer tends to increase.

  The preferred lower limit of each content of the plasticizer relative to 100 parts by weight of the polyvinyl acetal resin in the second and third layers is 25 parts by weight, the more preferred lower limit is 30 parts by weight, the still more preferred lower limit is 35 parts by weight, and the preferred upper limit is 50 parts by weight, more preferred upper limit is 45 parts by weight, and still more preferred upper limit is 40 parts by weight. When content of the said plasticizer satisfy | fills the said preferable minimum, the adhesive force of an intermediate film will become high and the penetration resistance of a laminated glass can be improved further. When content of the said plasticizer satisfy | fills the said preferable upper limit, transparency of an intermediate film can be improved further.

  From the viewpoint of further improving the sound insulation of the laminated glass, the content of the plasticizer relative to 100 parts by weight of the polyvinyl acetal resin in the first layer is based on 100 parts by weight of the polyvinyl acetal resin in the second and third layers. It is preferable that there is more content than a plasticizer. From the viewpoint of further enhancing the sound insulation of the laminated glass, the plasticizer content relative to 100 parts by weight of the polyvinyl acetal resin of the first layer is the plasticity of 100 parts by weight of the polyvinyl acetal resin of the second and third layers. It is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, still more preferably 15 parts by weight or more, particularly preferably 20 parts by weight or more, more preferably 25 parts by weight or more. It is particularly preferable that the amount is more than 30 parts by weight.

(Infrared absorber)
When the said 1st layer or the said 2nd layer contains the said infrared absorber, the thermal insulation of the intermediate film for laminated glasses and a laminated glass can be improved effectively. Examples of the infrared absorber include heat shielding particles, and also include at least one component (hereinafter sometimes referred to as component X) among phthalocyanine compounds, naphthalocyanine compounds, and anthracocyanine compounds. The infrared absorber is preferably a heat shielding particle or the component X.

  By the way, in recent years, for example, in the United States, the California Air Resources Board (CARB) has proposed reducing the amount of carbon dioxide emitted from automobiles in order to reduce greenhouse gases. It was. In order to reduce the amount of carbon dioxide emitted from automobiles, the CARB regulates the heat energy that passes through the laminated glass and flows into the automobile, reducing the fuel consumed by the air conditioner and reducing the fuel consumption of the automobile. I was considering improving it. Specifically, the CARB had planned to introduce cool car regulations (Cool Cars Standards).

  Specifically, in the above-mentioned cool car regulation, in 2012, Tts (Total Solar Transmission) of laminated glass used for automobiles was expected to be 50% or less. In 2016, it was expected that the Tts of the laminated glass was 40% or less. The Tts is an index of heat ray shielding.

  In addition, the heat ray reflective laminated glass using the glass which vapor-deposited the metal thin film or heat ray reflective PET generally called a thermoreflex type reflects the communication wave of not only infrared rays but a communication wavelength range. When the heat ray reflective laminated glass is used for the windshield, it is necessary to cut out the heat ray reflective portion in order to cope with many sensors. As a result, the average Tts of the entire windshield using the heat ray reflective laminated glass having a Tts of 50% is about 53%. Therefore, in a type of laminated glass that transmits communication waves and absorbs infrared rays, Tts was expected to be allowed up to 53%.

  As of September 2010, the introduction of the cool car regulations has been postponed, but there is still a tendency for laminated glass having a low Tts.

  Thus, in recent years, there has been a considerable increase in demand for improving the heat shielding properties of laminated glass. Moreover, it is calculated | required that the laminated glass using the intermediate film containing the said infrared absorber to make high heat-shielding property and high visible light transmittance | permeability (Visible Transmittance) compatible. That is, in the laminated glass, it is necessary to increase the heat shielding property while keeping the visible light transmittance high.

  Of the first to third layers, the layer containing the infrared absorber preferably contains both the heat shielding particles and the component X as the infrared absorber. In this case, the heat shielding property and visible light transmittance of the laminated glass can be effectively increased.

  The present inventors have found that the use of a layer containing heat-shielding particles and a specific component X described above can increase both the heat-shielding property and the visible light transmittance of the laminated glass.

  Of the first to third layers, the layer containing the polyvinyl acetal resin and the infrared absorber, and the preferred lower limit of the content of the infrared absorber is 100 parts by weight with respect to 100 parts by weight of the polyvinyl acetal resin. 01 parts by weight, more preferred lower limit is 0.1 parts by weight, even more preferred lower limit is 0.14 parts by weight, still more preferred lower limit is 0.2 parts by weight, still more preferred lower limit is 0.55 parts by weight, and particularly preferred lower limit is 0.6 parts by weight, the preferred upper limit is 3 parts by weight, the more preferred upper limit is 2 parts by weight, the still more preferred upper limit is 1.8 parts by weight, and the still more preferred upper limit is 1.65 parts by weight. If content of the said infrared absorber satisfy | fills the said preferable minimum, heat-shielding property can be made still higher. When the content of the infrared absorber satisfies the preferable upper limit, the visible light transmittance can be further increased.

  The content of the heat shielding particles in the layer containing the polyvinyl acetal resin and the infrared absorber is not particularly limited. In 100% by weight of the layer containing the polyvinyl acetal resin and the infrared absorber, the content of the infrared absorber is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, and further preferably 1% by weight. Above, particularly preferably 1.5% by weight or more, preferably 6% by weight or less, more preferably 5.5% by weight or less, further preferably 4% by weight or less, particularly preferably 3.5% by weight or less, most preferably 3.0% by weight or less. When the content of the infrared absorber in the layer containing the polyvinyl acetal resin and the infrared absorber is within the preferable range, the heat shielding property can be sufficiently increased, and the visible light transmittance is sufficiently high. can do.

  In the layer containing the polyvinyl acetal resin and the heat shielding particles, the content of the heat shielding particles with respect to 100 parts by weight of the polyvinyl acetal resin is defined as content A, and the content of the components with respect to 100 parts by weight of the polyvinyl acetal resin When the content is B, the content A is in the range of 0.1 to 3 parts by weight, and the ratio of the content A to the content B (the content A / the content B). Is preferably in the range of 3 to 2000. In this case, a laminated glass having a sufficiently high heat shielding property and a sufficiently high visible light transmittance can be obtained. However, even if the content A is 0.01 parts by weight or more, the heat shielding property and the visible light transmittance are increased.

Thermal barrier particles:
From the viewpoint of further improving the heat shielding property of the laminated glass, the infrared absorber preferably contains heat shielding particles, and more preferably contains metal oxide particles. The heat shielding particles are preferably particles (metal oxide particles) formed of a metal oxide. Only 1 type may be used for a heat-shielding particle and 2 or more types may be used together.

  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 once 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. In addition, a heat shielding particle means the particle | grains which can absorb infrared rays.

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

  The tungsten oxide particles are generally represented by the following formula (X1) or the following formula (X2). In the interlayer film for laminated glass according to the present invention, tungsten oxide particles represented by the following formula (X1) or the following formula (X2) are preferably used.

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

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

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

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

  The preferable lower limit of the average particle diameter of the heat shielding particles is 0.01 μm, the more preferable lower limit is 0.02 μm, the preferable upper limit is 0.1 μm, and the more preferable upper limit is 0.05 μm. When the average particle diameter satisfies the above preferable lower limit, the heat ray shielding property can be sufficiently enhanced. When the average particle diameter satisfies the preferable upper limit, the dispersibility of the heat shielding particles can be improved.

  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 the layer containing the polyvinyl acetal resin and the heat shielding particles in the first to third layers, the content A indicating the content of the heat shielding particles is in the range of 0.1 to 3 parts by weight. It is preferable that When the content A is within the above range, the heat shielding property can be sufficiently increased, and the visible light transmittance can be sufficiently increased. Further, when the content A is 3 parts by weight or less, the haze value of the obtained laminated glass is further reduced. The preferred lower limit of the content A is 0.14 parts by weight, the more preferred lower limit is 0.2 parts by weight, the still more preferred lower limit is 0.55 parts by weight, the particularly preferred lower limit is 0.6 parts by weight, and the preferred upper limit is 2 parts by weight. A more preferred upper limit is 1.8 parts by weight, and a still more preferred upper limit is 1.65 parts by weight. When the content A satisfies the preferable lower limit, the heat shielding property can be further increased. When the content A satisfies the preferable upper limit, the visible light transmittance can be further increased.

  The content of the heat shielding particles in the layer containing the polyvinyl acetal resin and the heat shielding particles is not particularly limited. In 100% by weight of the layer containing the polyvinyl acetal resin and the heat shielding particles, the content of the heat shielding particles is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, and further preferably 1% by weight. Above, particularly preferably 1.5% by weight or more, preferably 6% by weight or less, more preferably 5.5% by weight or less, further preferably 4% by weight or less, particularly preferably 3.5% by weight or less, most preferably 3.0% by weight or less. When the content of the heat-shielding particles in the layer containing the polyvinyl acetal resin and the heat-shielding particles is within the preferable range, the heat-shielding property can be sufficiently increased, and the visible light transmittance is sufficiently high. can do.

The interlayer film for laminated glass of the present invention preferably contains the heat shielding particles at a rate of 0.1 to 12 g / m ² . When the ratio of the heat shielding particles is within the above range, the heat shielding property can be sufficiently increased, and the visible light transmittance can be sufficiently increased. A preferred lower limit of the ratio of the heat shielding particles, 0.5g / ^{m 2,} and more preferable lower limit is 0.8 g / ^{m 2,} still more preferred lower limit 1.5 g / ^{m 2,} especially preferred lower limit is at 3 g / ^{m 2} The preferred upper limit is 11 g / m ² , the more preferred upper limit is 10 g / m ² , the still more preferred upper limit is 9 g / m ² , and the particularly preferred upper limit is 7 g / m ² . When the said ratio satisfy | fills the said preferable minimum, heat-shielding property can be made still higher, and when the said ratio satisfy | fills the said preferable upper limit, the said visible light transmittance | permeability can be made still higher.

Component X:
The component X is at least one component among phthalocyanine compounds, naphthalocyanine compounds, and anthracocyanine compounds. The component X is not particularly limited. As the component X, conventionally known phthalocyanine compounds, naphthalocyanine compounds and anthracocyanine compounds can be used. As for the said component X, only 1 type may be used and 2 or more types may be used together.

  The combined use of the heat shielding particles and the component X can sufficiently block infrared rays (heat rays). By using the metal oxide particles and the component X in combination, infrared rays can be blocked more effectively. In combination with the ITO particles or the tungsten oxide particles and the component X, infrared rays can be blocked more effectively.

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

  From the viewpoint of further increasing the heat shielding properties of the interlayer film and the laminated glass and sufficiently increasing the visible light transmittance, the component X is a group consisting of phthalocyanine, a derivative of phthalocyanine, naphthalocyanine, and a derivative of naphthalocyanine. It is preferable that it is at least one selected from.

  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, and contains a vanadium atom. Is more preferable. The component X is preferably at least one of a phthalocyanine derivative containing a vanadium atom or a copper atom and a naphthalocyanine 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 structure containing vanadium atoms.

  In the layer including the polyvinyl acetal resin and the heat shielding particles in the first to third layers, the content (content B) of the component X with respect to 100 parts by weight of the polyvinyl acetal resin is not particularly limited. The preferable lower limit of the content B of the component X is 0.0005 parts by weight, the preferable lower limit is 0.001 parts by weight, the more preferable lower limit is 0.0014 parts by weight, the still more preferable lower limit is 0.002 parts by weight, and the particularly preferable lower limit. Is 0.0025 parts by weight, the preferred upper limit is 0.05 parts by weight, the more preferred upper limit is 0.025 parts by weight, the still more preferred upper limit is 0.02 parts by weight, and the particularly preferred upper limit is 0.01 parts by weight. When the said content B satisfy | fills the said preferable minimum, heat-shielding property can be made still higher. When the content B satisfies the preferable upper limit, the visible light transmittance can be further increased. Moreover, when the said content B satisfy | fills the said preferable upper limit, the saturation of a laminated glass can be made low. The saturation can be measured according to JIS Z8729. The preferable upper limit of the saturation of the laminated glass is 65, the more preferable upper limit is 50, the still more preferable upper limit is 40, and the particularly preferable upper limit is 35. When the saturation satisfies the preferable upper limit, coloring of the laminated glass can be suppressed.

  Further, in 100% by weight of the layer containing the polyvinyl acetal resin and the heat shielding particles, the content of the component X is preferably 0.001% by weight or more, more preferably 0.005% by weight or more, and still more preferably 0.00. 05% by weight or more, particularly preferably 0.1% by weight or more, preferably 0.2% by weight or less, more preferably 0.18% by weight or less, still more preferably 0.16% by weight or less, particularly preferably 0.15% or less. % 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 can be sufficiently increased, and the visible light transmittance can be sufficiently increased.

(Yellow dye)
Each of the first to third layers may contain a yellow dye as necessary. Moreover, the layer containing the yellow dye among the first to third layers may contain the yellow dye in the entire layer containing the yellow dye, or may partially contain the yellow dye. .

  The interlayer film for laminated glass according to the present invention may have a transparent or opaque colored region and a second region different from the colored region. The intermediate film may have a transparent or opaque colored region R1 (first region) and a second region R2 different from the colored region R1. In this case, it is preferable that the colored region R1 contains a yellow dye. When the colored region R1 contains a yellow dye, the heat shielding property of the colored region can be increased. As a result, the heat shielding property of the laminated glass can be enhanced due to the colored region having a high heat shielding property. It is preferable that the colored region R1 is provided at the edge on the upper end side of the intermediate film. The colored region R1 may be provided in a region other than the edge portion on the upper end side of the intermediate film, and may be provided in an edge portion on the lower end side of the intermediate film, for example. Further, the colored region R1 may be provided on both the upper edge portion and the lower edge portion of the intermediate film.

  The visible light transmittance of the second region R2 is preferably higher than the visible light transmittance of the colored region R1. In this case, the visual field can be improved in the second region R2. The colored region R1 is preferably darker than the second region R2.

  The colored region R1 is preferably present in a strip shape at least at the edge on one end side. Laminated glass for vehicles such as automobiles, especially windshields, may be provided with a band-like colored region for the purpose of preventing the driving driver from feeling dazzled by sunlight or outdoor lighting. is there.

  The layer containing the infrared absorbing agent among the first to third layers includes a heat shielding particle, at least one component X of a phthalocyanine compound, a naphthalocyanine compound, and an anthocyanin compound, and a yellow dye. It is preferable. In this case, it is possible to obtain a laminated glass having higher heat shielding properties and higher visible light transmittance.

  The yellow dye is not particularly limited. As for the said yellow dye, only 1 type may be used and 2 or more types may be used together. The yellow dye preferably absorbs transmitted light of 380 to 500 nm, more preferably absorbs transmitted light of 390 to 480 nm, and effectively absorbs transmitted light of 395 to 460 nm. More preferably, it is particularly preferable to effectively absorb transmitted light of 400 to 450 nm. As a result, in addition to the heat shielding particles and the component X, the heat shielding properties can be further enhanced by using a yellow dye. Since the shielding property of heat rays can be sufficiently increased, the preferable lower limit of the maximum absorption wavelength of the yellow dye is 380 nm, the more preferable lower limit is 390 nm, the still more preferable lower limit is 395 nm, the particularly preferable lower limit is 400 nm, and the preferable upper limit is 500 nm, more preferable. The upper limit is 480 nm, the more preferable upper limit is 460 nm, and the particularly preferable upper limit is 450 nm. For example, the maximum absorption wavelength of the yellow dye is a solution in which 0.01 part by weight of the yellow dye is dissolved in 100 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO) (cell length: 1 mm, It can be measured with a spectrophotometer (Hitachi High-Tech "U-4100") using a quartz cell.

  Specific examples of the yellow dye include anthraquinone dye, quinoline dye, isoquinoline dye, monoazo dye, disazo dye, quinophthalone dye, perylene dye, triphenylmethane dye, and methine dye. Among these, anthraquinone dyes are preferable from the viewpoint of further improving the heat shielding property of the interlayer film for laminated glass.

  As commercially available yellow dyes, “ORACEET Yellow GHS” manufactured by Ciba Japan (anthraquinone dye, maximum absorption wavelength 450 nm), “KP Last Yellow G” (methine dye, maximum absorption wavelength 400 nm) manufactured by Kiwa Chemical Industry Co., Ltd. ), “KP Plast Yellow 2G” (quinophthalone dye, maximum absorption wavelength 420 nm), “KP Plast Yellow 3G” (monoazo dye, maximum absorption wavelength 395 nm), “KP Plast Yellow F” (isoquinoline dye, maximum absorption wavelength 415 nm), “KP Past Yellow 7G” (perylene dye, maximum absorption wavelength 460 nm) and the like.

  In the layer containing the polyvinyl acetal resin and the yellow dye in the first and third layers, the content of the yellow dye with respect to 100 parts by weight of the polyvinyl acetal resin is 0.005 to 0.24 parts by weight. It is preferable to be within the range. The more preferable lower limit of the content of the yellow dye with respect to 100 parts by weight of the polyvinyl acetal resin in the layer containing the polyvinyl acetal resin and the yellow dye is 0.01 parts by weight, and the more preferable lower limit is 0.04 parts by weight. A preferred lower limit is 0.06 parts by weight, a more preferred upper limit is 0.2 parts by weight, a still more preferred upper limit is 0.15 parts by weight, and a particularly preferred upper limit is 0.1 parts by weight. When the yellow dye is partially contained, the lower limit and the upper limit of the preferred content of the yellow dye in the portion containing the yellow dye (for example, the colored region) are the same as those described above. When the content of the yellow dye is within the above range, the heat shielding property can be further increased and the visible light transmittance can be further increased.

The interlayer film for laminated glass according to the present invention preferably contains the yellow dye at a rate of 0.025 to 1.45 g / m ² . A more preferred lower limit of the content of the yellow dye of the combined glass interlayer film for 0.05 g / ^{m 2,} still more preferred lower limit 0.2 g / ^{m 2,} especially preferred lower limit is 0.3 g / ^{m 2,} more a preferred upper limit is 1.2 g / ^{m 2,} still more preferred upper limit 1 g / ^{m 2,} particularly preferred upper limit is 0.8 g / ^{m 2.} When the content ratio of the yellow dye is within the above range, the heat shielding property can be further increased, and the visible light transmittance can be further increased.

  In the layer containing the polyvinyl acetal resin, the component X and the yellow dye in the first and third layers, the total content of the component X and the yellow dye with respect to 100 parts by weight of the p-polyvinyl acetal resin. The preferred lower limit is 0.005 parts by weight, the more preferred lower limit is 0.03 parts by weight, the still more preferred lower limit is 0.04 parts by weight, the particularly preferred lower limit is 0.07 parts by weight, and the more preferred upper limit is 0.24 parts by weight. Parts, and a more preferred upper limit is 0.2 parts by weight, a particularly preferred upper limit is 0.18 parts by weight, and a most preferred upper limit is 0.15 parts by weight. When the yellow dye is partially contained, the lower limit and the upper limit of the preferable content of the total content of the component X and the yellow dye in the portion containing the yellow dye are the same as the above-described values. When the total content of the yellow dye and the component X is within the above range, the heat shielding property can be further increased, and the visible light transmittance can be further increased.

The sum of component A preferred lower limit of the content of the X and yellow dye 0.005 g / ^{m 2} in the interlayer film for a laminated glass, and more preferable lower limit is 0.03 g / ^{m 2,} still more preferred lower limit 0.2 g / ^{m 2} , especially preferred lower limit is 0.25 g / ^{m 2,} a preferred upper limit is 1.5 g / ^{m 2,} and more preferable upper limit is 1.2 g / ^{m 2,} still more preferred upper limit 1 g / ^{m 2,} particularly preferred upper limit 0. 7 g / m ² . When the total content of the component X and the yellow dye satisfies the preferable lower limit, the heat shielding property of the laminated glass can be further enhanced. When the total content of the component X and the yellow dye satisfies the preferable upper limit, the visible light transmittance can be further increased.

(Metal salt)
Each of the first to third layers preferably contains at least one metal salt (hereinafter sometimes referred to as metal salt M) of an alkali metal salt and an alkaline earth metal salt. The first layer preferably contains a metal salt M. In particular, the second and third layers preferably each contain the metal salt M. By using the metal salt M, it becomes easy to control the adhesion between the laminated glass constituent member and the interlayer film or the adhesion between the layers in the interlayer film. Furthermore, since the first layer contains the upper metal salt M, the dispersibility of the infrared absorber such as the heat-shielding particles is further improved, and as a result, the weather resistance of the intermediate film is further increased and is high. Visible light transmittance can be maintained for a longer period of time. As for the said metal salt M, only 1 type may be used and 2 or more types may be used together.

  The metal salt M preferably contains at least one metal selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba. The metal salt M is preferably contained in the layer of the intermediate film in the state of metal ion, hydrated metal ion, complexed metal ion, metal inorganic salt, or metal organic acid ester. When present in the form of metal ions, hydrated metal ions, or complex metal ions, it is easy to control the adhesion between the laminated glass component and the interlayer film, or the adhesion between each layer in the interlayer film. is there. The metal salt contained in the interlayer film layer preferably contains at least one of K and Mg.

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

  Although it does not specifically limit as said C2-C16 carboxylic acid magnesium salt and said C2-C16 carboxylic acid potassium salt, For example, magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, 2-ethylbutanoic acid Examples include magnesium, potassium 2-ethylbutanoate, magnesium 2-ethylhexanoate, and potassium 2-ethylhexanoate.

  In the layer containing the metal salt M among the first to third layers, the content of the metal salt M is the content of metal ions (for example, magnesium concentration in the case of magnesium ions, potassium concentration in the case of potassium ions). ) Is preferably 5 ppm or more, more preferably 10 ppm or more, still more preferably 20 ppm or more, preferably 300 ppm or less, more preferably 250 ppm or less, still more preferably 200 ppm or less. When the content of the metal salt M is not less than the above lower limit and not more than the above upper limit, the adhesiveness between the laminated glass constituent member and the intermediate film or the adhesiveness between each layer in the intermediate film can be controlled even better. Furthermore, when the content of the metal salt M is equal to or higher than the lower limit, the weather resistance of the intermediate film is further increased, and high visible light transmittance can be maintained for a further long period.

(UV shielding agent)
In the interlayer film for laminated glass according to the present invention, it is preferable that the first layer contains an ultraviolet shielding agent, or the second layer contains an ultraviolet shielding agent, and the second layer is an ultraviolet shielding agent. It is more preferable to contain an agent. Both the first layer and the second layer may contain 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 time, the visible light transmittance is hardly lowered. As for this ultraviolet shielding agent, only 1 type may be used and 2 or more types may be used together. The ultraviolet shielding agents used for the first, second and third layers may be the same or different.

  As a result of the study by the present inventors, only by producing a laminated glass using an interlayer film containing the heat shielding particles and the specific component X, when the obtained laminated glass is used for a long period of time, the heat shielding properties are obtained. It was found that there was a tendency to decrease. Therefore, as a result of further studies by the present inventors, the present inventors have also found a configuration of an interlayer film for laminated glass that can maintain high heat shielding properties for a long period of time.

  That is, the present inventors dared to make the interlayer film for laminated glass into a multilayer of two or more layers, and by adopting a configuration comprising the layer containing the infrared absorber and the layer containing the ultraviolet shielding agent, It has been found that even when laminated glass is used for a long period of time, the visible light transmittance is hardly lowered. In particular, the use of an ultraviolet shielding agent can suppress the chemical change of the component X and the deterioration of the resin accompanying the chemical change of the component X. For this reason, the outstanding heat insulation can be maintained over a long period of time.

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

  Conventionally known general UV screening agents are, for example, metal UV screening agents, metal oxide UV screening agents, benzotriazole UV screening agents (bent triazole compounds), and benzophenone UV screening agents (benzophenone). Compound), triazine-based UV screening agent (triazine compound), malonic acid ester-based UV screening agent (malonic acid ester compound), oxalic acid anilide-based UV screening agent (oxalic acid anilide compound) and benzoate-based UV screening agent (benzoate compound) Etc.

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

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

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

  Examples of the benzotriazole-based ultraviolet shielding agent include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole (“TinvinP” manufactured by BASF), 2- (2′-hydroxy-3 ′, 5 ′). -Di-t-butylphenyl) benzotriazole ("Tinvin 320" manufactured by BASF), 2- (2'-hydroxy-3'-t-butyl-5-methylphenyl) -5-chlorobenzotriazole (manufactured by BASF " Tinuvin 326 ") and 2- (2'-hydroxy-3 ', 5'-di-amylphenyl) benzotriazole (" Tinvin 328 "manufactured by BASF) and the like. The benzotriazole-based ultraviolet shielding agent is preferably a benzotriazole-based ultraviolet shielding agent containing a halogen atom, and more preferably a benzotriazole-based ultraviolet shielding agent containing a chlorine atom, because of its excellent ability to absorb ultraviolet rays. .

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

  Examples of the triazine-based ultraviolet shielding agent include 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol (manufactured by BASF Corporation, “Tinuvin 1577FF”). ]) And the like.

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

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

  Examples of the oxalic acid anilide-based ultraviolet shielding agent include N- (2-ethylphenyl) -N ′-(2-ethoxy-5-t-butylphenyl) oxalic acid diamide, N- (2-ethylphenyl) -N ′. Oxalic acid diamides having an aryl group substituted on a nitrogen atom, such as-(2-ethoxy-phenyl) oxalic acid diamide, 2-ethyl-2'-ethoxy-oxyanilide ("Sanduvor VSU" manufactured by Clariant) Can be mentioned.

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

  In order to suppress a decrease in visible light transmittance of the interlayer film and the laminated glass after aging, the ultraviolet shielding agent is 2- (2′-hydroxy-3′-t-butyl-5-methylphenyl) -5- It is preferably chlorobenzotriazole (“Tinvin 326” manufactured by BASF) or 2- (2′-hydroxy-3 ′, 5′-di-amylphenyl) benzotriazole (“Tinvin 328” manufactured by BASF). It may be (2′-hydroxy-3′-t-butyl-5-methylphenyl) -5-chlorobenzotriazole.

  The content of the ultraviolet shielding agent is not particularly limited. From the viewpoint of further suppressing the decrease in visible light transmittance after time, the content of the ultraviolet shielding agent is preferably in 100% by weight of the first to third layers containing the ultraviolet shielding agent. Is 0.1% by weight or more, more preferably 0.2% by weight or more, further preferably 0.3% by weight or more, particularly preferably 0.5% by weight or more, preferably 2.5% by weight or less, more preferably It is 2% by weight or less, more preferably 1% by weight or less, and particularly preferably 0.8% by weight or less. In particular, the content of the ultraviolet screening agent in 100% by weight of the first layer is 0.2% by weight or more, or the content of the ultraviolet screening agent in 100% by weight of the second and third layers. When the amount is 0.2% by weight or more, a decrease in visible light transmittance after aging of the interlayer film and the laminated glass can be remarkably suppressed.

  The interlayer film for laminated glass according to the present invention has a weight (weight%) ratio (heat shielding particles: all ultraviolet shielding agents) of the heat shielding particles and all the ultraviolet shielding agents to the entire intermediate film, and 4: It is preferable to include by 1: 1: 200, and it is more preferable to include by 2: 1-1: 100. When the weight (% by weight) ratio of the heat shielding particles to all the ultraviolet shielding agents is within the above range, the heat shielding property and visible light transmittance of the interlayer film and the laminated glass, and after the aging of the interlayer film and the laminated glass The visible light transmittance of can be further increased. The weight ratio means the content of the heat shielding particles in 100% by weight of the intermediate film (% by weight) and the content of all the ultraviolet shielding agents in the 100% by weight of the intermediate film (% by weight). Indicates the ratio.

(Antioxidant)
The interlayer film for laminated glass according to the present invention preferably contains an antioxidant. The first layer preferably contains an antioxidant, and the second and third layers preferably contain an antioxidant. As for this antioxidant, only 1 type may be used and 2 or more types may be used together.

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

  From the viewpoint of more effectively maintaining the high visible light transmittance of the interlayer film and the laminated glass over a long period of time, the antioxidant is preferably a phenol-based antioxidant or a phosphorus-based antioxidant.

  Commercially available products of the above-mentioned antioxidants include, for example, trade name “IRGANOX 245” manufactured by BASF, trade name “IRGAFOS 168” manufactured by BASF, trade name “IRGAFOS 38” manufactured by BASF, and Sumitomo Chemical Co., Ltd. A trade name “Sumilyzer BHT” and a trade name “Irganox 1010” manufactured by Ciba Geigy are listed.

  In order to maintain the high visible light transmittance of the interlayer film and the laminated glass for a long period of time, in 100% by weight of the layer containing the antioxidant or in 100% by weight of the interlayer film among the first to third layers. The content of the antioxidant is preferably 0.75% by weight or more. Moreover, 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 layer containing the antioxidant or 100% by weight of the intermediate film. In addition, in order to maintain the visible light transmittance of the intermediate film and the laminated glass after the lapse of time, the higher the content of the antioxidant, the better.

  From the viewpoint of further increasing the heat shielding properties and visible light transmittance of the interlayer film and the laminated glass, and the visible light transmittance after the lapse of time of the interlayer film and the laminated glass, the antioxidant of the first to third layers. The content of the antioxidant is preferably 0.75% by weight or more, more preferably 0.8% by weight or more in 100% by weight of the layer containing or 100% by weight of the interlayer film. In order to suppress the color change of the peripheral part due to the influence of the antioxidant, the content of the antioxidant is preferably 2% by weight in 100% by weight of the layer containing the antioxidant or 100% by weight of the intermediate film. Below, more preferably 1.8% by weight or less.

  The interlayer film for laminated glass according to the present invention includes the thermal barrier particles and the antioxidant in a weight ratio (thermal barrier particles: antioxidant) of 10: 1 to 1: 100 in the entire intermediate film. It is more preferable to include 5: 1 to 1:50. When the weight ratio between the heat shielding particles and the antioxidant is within the above range, the heat shielding property and visible light transmittance of the interlayer film and the laminated glass, and the visible light transmittance after aging of the interlayer film and the laminated glass are further increased. It can be further enhanced. The weight ratio is the ratio between the content of the heat shielding particles in 100% by weight of the intermediate film (% by weight) and the content of the antioxidant in the film of 100% by weight (% by weight). Show.

(Other ingredients)
Each of the first to third layers contains additives such as a light stabilizer, a flame retardant, an antistatic agent, a pigment, a dye, an adhesion modifier, a moisture-resistant agent, and a fluorescent brightening agent, as necessary. It may be.

(Method for producing interlayer film for laminated glass and laminated glass)
Although the manufacturing method of the interlayer film for laminated glass according to the present invention is not particularly limited, after forming the first to third layers using a resin composition containing the polyvinyl acetal resin and the plasticizer, For example, the second layer, the first layer, and the third layer are laminated in this order, and the resin composition is coextruded using an extruder, whereby the second layer And a method of laminating the first layer and the third layer in this order. Since the production efficiency of the interlayer film is excellent, it is preferable that the second and third layers contain the same polyvinyl acetal resin, and the second and third layers contain the same polyvinyl acetal resin and More preferably, the same plasticizer is contained, and the second and third layers are more preferably formed of the same resin composition.

  Each of the interlayer films for laminated glass according to the present invention is used to obtain a laminated glass.

  FIG. 2 is a cross-sectional view schematically showing an example of a laminated glass using the intermediate film 1 shown in FIG.

  A laminated glass 11 shown in FIG. 2 includes a first laminated glass constituting member 12, a second laminated glass constituting member 13, and the intermediate film 1. The intermediate film 1 is sandwiched between the first and second laminated glass constituent members 12 and 13.

  The first laminated glass constituting member 12 is laminated on the outer surface 3 a of the second layer 3. The second laminated glass component 13 is laminated on the outer surface 4 a of the third layer 4. Accordingly, the laminated glass 11 is composed of the first laminated glass constituting member 12, the second layer 3, the first layer 2, the third layer 4, and the second laminated glass constituting member 13 in this order. It is laminated and configured.

  Examples of the first and second laminated glass constituent members include glass plates and PET (polyethylene terephthalate) films. Laminated glass includes not only laminated glass in which an intermediate film is sandwiched between two glass plates, but also laminated glass in which an intermediate film is sandwiched between a glass plate and a PET film or the like. Laminated glass is a laminated body provided with a glass plate, and preferably at least one glass plate is used.

  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, netted plate glass, and lined plate glass. The organic glass is a synthetic resin glass substituted for inorganic glass. Examples of the organic glass include polycarbonate plates and poly (meth) acrylic resin plates. Examples of the poly (meth) acrylic resin plate include a polymethyl (meth) acrylate plate.

  From the viewpoint of further improving the penetration resistance of the laminated glass, the preferable lower limit of the thickness of the interlayer film is 0.05 mm, the more preferable lower limit is 0.25 mm, the preferable upper limit is 3 mm, and the more preferable upper limit is 1.5 mm. When the thickness of the interlayer film satisfies the preferable lower limit and the preferable upper limit, the penetration resistance and transparency of the laminated glass can be further enhanced.

  In the case of a laminated structure of two or more layers, a preferable lower limit of the thickness of the first layer is 0.01 mm, a more preferable lower limit is 0.04 mm, a still more preferable lower limit is 0.07 mm, and a preferable upper limit is 0.3 mm. The upper limit is 0.2 mm, the more preferable upper limit is 0.18 mm, and the particularly preferable upper limit is 0.16 mm. When the thickness of the first layer satisfies the above lower limit, the sound insulating property of the laminated glass can be further increased, and when the upper limit is satisfied, the transparency of the laminated glass can be further increased. A preferable lower limit of the thickness of the second and third layers is 0.1 mm, a more preferable lower limit is 0.2 mm, a still more preferable lower limit is 0.25 mm, a particularly preferable lower limit is 0.3 mm, and a preferable upper limit is 0.6 mm. A preferred upper limit is 0.5 mm, a more preferred upper limit is 0.45 mm, and a particularly preferred upper limit is 0.4 mm. When the thicknesses of the second and third layers satisfy the above lower limit, the penetration resistance of the laminated glass can be further increased, and when the upper limit is satisfied, the transparency of the laminated glass can be further increased. The ratio of the thickness of the first layer to the thickness of the intermediate film ((thickness of the first layer) / (thickness of the intermediate film)) is small, and the plasticizer contained in the first layer is contained. The larger the amount, the more foaming occurs in the laminated glass and the foam tends to grow. In particular, when the ratio in the intermediate film is 0.05 to 0.35 and the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is 55 parts by weight or more, Generation | occurrence | production of foaming and the growth of foaming in the laminated glass using the intermediate film for laminated glass which concerns on invention can fully be suppressed, and the sound-insulating property of laminated glass can be improved further. The preferable lower limit of the ratio ((the thickness of the first layer) / (the thickness of the intermediate film)) is 0.06, the more preferable lower limit is 0.07, the still more preferable lower limit is 0.08, and the particularly preferable lower limit is 0.00. 1. A preferred upper limit is 0.3, a more preferred upper limit is 0.25, a still more preferred upper limit is 0.2, and a particularly preferred upper limit is 0.15.

  The thickness of the first and second laminated glass constituting members is preferably 0.5 mm or more, more preferably 1 mm or more, preferably 5 mm or less, more preferably 3 mm or less. Moreover, when the said laminated glass structural member is a glass plate, it is preferable that the thickness of this glass plate exists in the range of 1-3 mm. When the laminated glass component is a PET film, the thickness of the PET film is preferably in the range of 0.03 to 0.5 mm.

  The manufacturing method of the said laminated glass is not specifically limited. For example, the intermediate film is sandwiched between the first and second laminated glass constituent members, passed through a pressing roll, or put in a rubber bag and sucked under reduced pressure, and the first and second laminated glass The air remaining between the glass component and the intermediate film is degassed. Then, it pre-adheres at about 70-110 degreeC, and a laminated body is obtained. Next, the laminated body is put in an autoclave or pressed, and pressed at about 120 to 150 ° C. and a pressure of 1 to 1.5 MPa. In this way, the laminated glass can be obtained.

  The laminated glass can be used for automobiles, railway vehicles, aircraft, ships, buildings, and the like. Laminated glass can be used for other purposes. The laminated glass is preferably laminated glass for buildings or vehicles, and more preferably laminated glass for vehicles. Laminated glass can be used for a windshield, side glass, rear glass, roof glass, or the like of an automobile.

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

Example 1
(1) Preparation of dispersion 37.5 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO), 0.98 parts by weight of ITO particles (manufactured by Mitsubishi Materials), and naphthalocyanine compound (copper naphthalocyanine) The compound, “FF IRSORB203” manufactured by Fuji Film Co., Ltd.) was mixed in 0.0182 parts by weight, and further a phosphate ester compound as a dispersant was added, followed by mixing in a horizontal microbead mill to obtain a mixed solution. . Thereafter, 0.1 part by weight of acetylacetone was added to the mixed solution with stirring to prepare a dispersion. The content of the phosphate ester compound was adjusted to be 1/10 of the content of the heat shielding particles.

(2) Production of multilayer interlayer film Polyvinyl butyral resin A (hydroxyl content 25.2 mol%, acetylation degree 12.3 mol%, butyralization degree 62.5 mol%) 100 parts by weight as a plasticizer 60 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO) was added and sufficiently kneaded with a mixing roll to obtain an intermediate layer resin composition. Furthermore, 100 parts by weight of polyvinyl butyral resin B (hydroxyl content 31.2 mol%, acetylation degree 0.8 mol%, butyralization degree 68.0 mol%) was added with the total amount of plasticizer, and mixed with a mixing roll. The mixture was sufficiently kneaded to obtain a resin composition for the surface layer.

  The surface layer (thickness 350 μm), the intermediate layer (thickness 100 μm), and the surface layer (thickness 350 μm) are sequentially laminated by co-extrusion using the obtained intermediate layer resin composition and surface layer resin composition. A multilayer interlayer film was prepared.

(3) Production of laminated glass used for penetration resistance test and optical strain evaluation The obtained multilayer interlayer film was cut into a size of 30 cm in length and 30 cm in width. Next, a multilayer intermediate film was sandwiched between two transparent float glasses (length 30 cm × width 30 cm × thickness 2.5 mm) to obtain a laminate. This laminated body is put in a rubber bag, deaerated at a vacuum degree of 2.6 kPa for 20 minutes, then transferred to an oven while being deaerated, and further kept at 90 ° C. for 30 minutes and vacuum pressed to prepare a laminated body as a preliminary. Crimped. The pre-pressed laminate was pressed in an autoclave at 135 ° C. and a pressure of 1.2 MPa for 20 minutes to obtain a laminated glass used for penetration resistance test and optical strain evaluation.

(4) Production of laminated glass used for sound insulation measurement Multilayer interlayer film is cut into a size of 30 cm in length x 2.5 cm in width, and transparent float glass (length 30 cm x width 2.5 cm x thickness 2.5 mm) is obtained. A laminated glass used for sound insulation measurement was obtained in the same manner as the laminated glass used for the penetration resistance test except that it was used.

(5) Preparation of laminated glass used for foaming tests A and B The obtained multilayer interlayer film was cut into a size of 30 cm in length and 15 cm in width and stored in an environment at a temperature of 23 ° C. for 10 hours. In addition, embossing was formed on both surfaces of the obtained multilayer intermediate film, and the ten-point average roughness of the embossing was 30 μm. In the cut multilayer intermediate film, an intersection 4 between a position 8 cm inward in the vertical direction from the end of the multilayer intermediate film and a position 5 cm inward in the lateral direction from the end of the multilayer intermediate film. A through-hole with a diameter of 6 mm was produced at the location.

  A multilayer intermediate film having a through hole was sandwiched between two transparent float glasses (length 30 cm × width 15 cm × thickness 2.5 mm) to obtain a laminate. The outer peripheral edge of the laminate was sealed with a sealing agent having a width of 2 cm from the end portion by heat sealing, thereby enclosing the air remaining in the emboss and the air remaining in the through hole. The laminated body was pressure-bonded at 135 ° C. and a pressure of 1.2 MPa for 20 minutes, so that the remaining air was dissolved in the multilayer interlayer film to obtain a laminated glass used for foaming tests A and B.

(Examples 2-20 and Comparative Examples 1-2)
In the same manner as in Example 1 except that the composition of the first to third layers and the composition of the dispersion (number of blended parts of the plasticizer) were changed as shown in Tables 1 and 2 below, the interlayer film and the laminated glass Was made.

  In addition, the content of the hydroxyl group of polyvinyl acetal resins C to V shown in Tables 1 to 2 below, the degree of acetylation, the degree of butyralization, and the polyvinyl alcohol (PVA) used for the synthesis of the PVB resin of the first layer The degree of polymerization is a value shown in Tables 1 and 2 below. In addition, the polymerization degree of the polyvinyl alcohol (PVA) used for the synthesis | combination of the PVB resin of a 1st layer showed only about Examples 5-20.

(Evaluation)
(1) Sound insulation The laminated glass is vibrated with a vibration generator for vibration testing ("Vibrator G21-005D" manufactured by KENKEN Co., Ltd.), and the vibration characteristics obtained therefrom are mechanical impedance measuring device (manufactured by RION Co., Ltd.) The vibration spectrum was analyzed with an FFT spectrum analyzer ("FFT analyzer HP3582A" manufactured by Yokogawa Hured Packard).

  From the ratio of the loss factor thus obtained and the resonance frequency of the laminated glass, a graph showing the relationship between the sound frequency (Hz) and the sound transmission loss (dB) at 20 ° C. is created. The minimum sound transmission loss (TL value) in the vicinity of 000 Hz was determined. The higher the TL value, the higher the sound insulation. The results are shown in Tables 1 and 2 below, where “◯” indicates a case where the TL value is 35 dB or more and “X” indicates a case where the TL value is less than 35 dB.

(2) Foam test A (foaming state)
Five laminated glasses used for the foam test A were prepared for each multilayer intermediate film, and left in an oven at 50 ° C. for 100 hours. In the laminated glass after being left, the presence or absence of foaming and the size of foaming were visually observed in plan view, and the state of foaming was judged according to the following criteria.

[Criteria of foaming state by foaming test A]
Foam generated in five laminated glasses was approximated by an ellipse, and the area of the ellipse was defined as the foamed area. The average value of the elliptical areas observed in the five laminated glasses was determined, and the ratio (percentage) of the average value (foamed area) of the elliptical area to the area (30 cm × 15 cm) of the laminated glass was determined.

◯: No foaming was observed in all the 5 laminated glasses. ○: The ratio of the average value of the elliptical area (foamed area) was less than 5%. △: The ratio of the average value of the elliptical area (foamed area) It was 5% or more and less than 10% x: The ratio of the average value (foaming area) of the elliptical area was 10% or more

(3) Foam test B (foaming state)
Thirty laminated glasses used for the foam test B were prepared for each multilayer intermediate film and left in an oven at 50 ° C. for 24 hours. In the laminated glass after being left, the number of laminated glasses in which foaming was visually observed was confirmed.

(4) Penetration resistance The laminated glass (300 mm long x 300 mm wide) used for the penetration resistance test was adjusted so that the surface temperature was 23 ° C. Next, in accordance with JIS R3212, a rigid sphere having a mass of 2260 g and a diameter of 82 mm was dropped from the height of 4 m onto the center portion of the laminated glass for each of the six laminated glasses. For all six laminated glasses, the case where the hard sphere did not penetrate within 5 seconds after the collision of the hard sphere was regarded as acceptable. If the number of laminated glasses in which the hard sphere did not penetrate within 5 seconds after the collision of the hard sphere was 3 or less, it was rejected. In the case of four sheets, the penetration resistance of six new laminated glasses was evaluated. In the case of 5 sheets, one additional laminated glass was additionally tested, and the case where the hard sphere did not penetrate within 5 seconds after the collision of the hard sphere was regarded as acceptable. In the same manner, from a height of 5 m and 6 m, a rigid sphere having a mass of 2260 g and a diameter of 82 mm was dropped on the laminated glass of 6 sheets, and the penetration resistance of the laminated glass was evaluated. .

(5) Evaluation of bleed out On the surface of the obtained intermediate film, two lines each having a length of 10 cm were written and marked with a red oily magic in the vertical direction and the horizontal direction. The marked interlayer film was placed so that the main surface was located in a plane parallel to the vertical direction. This was left to stand for 1 month under constant temperature and humidity conditions of 23 ° C. and relative humidity of 28%. In the case where the oily magic bleed and sag are not observed on any of the four lines in the intermediate film after standing, the pass is “○”, and is observed on at least one of the four lines. Was rejected as “x”.

(6) Evaluation of optical distortion The light transmitted through the slit from the light source (halogen lamp) is applied to the laminated glass (length 30cm x width 30cm) used for the evaluation of optical distortion, and the projection distortion reflected on the screen is a sensor (camera). And processed by a computer to obtain an optical distortion value. A case where the optical distortion value was 1.8 or less was regarded as acceptable “◯”, and a case where it exceeded 1.8 was regarded as unacceptable “x”. It can be said that the higher the optical distortion value, the larger the optical distortion (distortion of the image).

  The results are shown in Tables 1-2 below. In Tables 1 and 2 below, 3GO as the type of plasticizer represents triethylene glycol di-2-ethylhexanoate, and 3GH represents triethylene glycol di-2-ethylbutyrate.

DESCRIPTION OF SYMBOLS 1 ... Intermediate film 2 ... 1st layer 2a ... One side 2b ... The other side 3 ... 2nd layer 3a ... Outer surface 4 ... 3rd layer 4a ... Outer surface 11 ... Laminated glass 12 ... 1st Laminated glass constituent member 13 ... Second laminated glass constituent member

Claims (23)

A first layer containing a polyvinyl acetal resin and a plasticizer;
A second layer that is laminated on one side of the first layer and contains a polyvinyl acetal resin and a plasticizer;
The first layer contains an infrared absorber, or the second layer contains an infrared absorber;
The content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is 50 parts by weight or more,
The hydroxyl group content of the polyvinyl acetal resin in the first layer is lower than the hydroxyl group content of the polyvinyl acetal resin in the second layer,
The difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer is 9.2 mol% or less,
The difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer is more than 8.5 mol% and 9.2 mol When it is% or less, the interlayer film for laminated glass, wherein the degree of acetylation of the polyvinyl acetal resin in the first layer is 8 mol% or less.   The interlayer film for laminated glass according to claim 1, wherein the second layer contains the infrared absorber.   The interlayer film for laminated glass according to claim 1 or 2, wherein the infrared absorber includes heat shielding particles.   The interlayer film for laminated glass according to any one of claims 1 to 3, wherein the infrared absorber contains metal oxide particles. The difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer is 9.2 mol% or less,
When the difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer is 8.5 mol% or less, The interlayer film for laminated glass according to any one of claims 1 to 4, wherein the degree of acetylation of the polyvinyl acetal resin in the first layer exceeds 8 mol%.   The laminated glass according to any one of claims 1 to 5, wherein the polyvinyl acetal resin in the first layer has an acetylation degree of 8 mol% or less and a hydroxyl group content of less than 31.5 mol%. Interlayer film.   The interlayer film for laminated glass according to any one of claims 1 to 6, wherein the polyvinyl acetal resin in the first layer has an acetylation degree of 8 mol% or less and an acetalization degree of 68 mol% or more. .   The laminated glass of any one of Claims 1-7 whose content rate of the hydroxyl group of the said polyvinyl acetal resin in a said 1st layer is less than 31.5 mol%, and an acetalization degree is 68 mol% or more. Interlayer film. When the difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer is 8.5 mol% or less,
The interlayer film for laminated glass according to any one of claims 1 to 8, wherein the degree of acetylation of the polyvinyl acetal resin in the first layer is more than 8 mol% and less than 20 mol%. When the difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer is 8.5 mol% or less,
The laminated glass according to any one of claims 1 to 9, wherein the degree of acetylation of the polyvinyl acetal resin in the first layer exceeds 8 mol%, and the degree of acetalization is 52.5 mol% or more. Interlayer film. When the difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer is 8.5 mol% or less,
11. The laminated glass according to claim 1, wherein the degree of acetylation of the polyvinyl acetal resin in the first layer exceeds 8 mol%, and the hydroxyl group content is 28 mol% or less. Interlayer film.   The polyvinyl acetal resin in the first layer is a polyvinyl acetal resin obtained by acetalizing polyvinyl alcohol having a degree of polymerization of more than 1700 and 3000 or less. An interlayer film for laminated glass as described in 1.   The interlayer film for laminated glass according to any one of claims 1 to 12, wherein the content of hydroxyl groups in the polyvinyl acetal resin in the second layer is 33 mol% or less.   The content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is larger than the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the second layer. The interlayer film for laminated glass according to any one of ˜13.   The content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is 20 parts by weight or more than the content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the second layer. The interlayer film for laminated glass according to claim 14, wherein the interlayer film is large.   The difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the second layer is 8.5 mol% or less. The interlayer film for laminated glass according to any one of -15. A third layer laminated on the other surface of the first layer and containing a polyvinyl acetal resin and a plasticizer;
The hydroxyl group content of the polyvinyl acetal resin in the first layer is lower than the hydroxyl group content of the polyvinyl acetal resin in the third layer,
The difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the third layer is 9.2 mol% or less,
The difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the third layer is more than 8.5 mol% and 9.2 mol The interlayer film for laminated glass according to any one of claims 1 to 16, wherein when the content is not more than%, the degree of acetylation of the polyvinyl acetal resin in the first layer is not more than 8 mol%.   The interlayer film for laminated glass according to claim 17, wherein the third layer contains an infrared absorber. The difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the third layer is 9.2 mol% or less,
When the difference between the hydroxyl group content of the polyvinyl acetal resin in the first layer and the hydroxyl group content of the polyvinyl acetal resin in the third layer is 8.5 mol% or less, The interlayer film for laminated glass according to claim 17 or 18, wherein a degree of acetylation of the polyvinyl acetal resin in the first layer exceeds 8 mol%.   The interlayer film for laminated glass according to any one of claims 17 to 19, wherein a content ratio of a hydroxyl group of the polyvinyl acetal resin in the third layer is 33 mol% or less.   Content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the first layer is more than each content of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal resin in the second and third layers. The interlayer film for laminated glass according to any one of claims 17 to 20, wherein there are many. Each of the polyvinyl acetal resins contained in the first to third layers includes a polyvinyl butyral resin,
The intermediate for laminated glass according to any one of claims 17 to 21, wherein each of the plasticizers contained in the first to third layers contains triethylene glycol di-2-ethylhexanoate. film. First and second laminated glass components;
An intermediate film sandwiched between the first and second laminated glass constituent members,
Laminated glass, wherein the interlayer film is the interlayer film for laminated glass according to any one of claims 1 to 22.

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