JP2022033063A - Resin material for intermediate film of glass laminate, film material for intermediate film of glass laminate, and glass laminate - Google Patents

Abstract

To provide a resin material for an intermediate film of a glass laminate which makes it possible to further improve chipping resistance of the glass laminate.SOLUTION: A resin material for an intermediate film of a glass laminate that contains a thermoplastic resin containing a polyvinyl acetal resin and may further contain a plasticizer is disclosed. A proportion of the polyvinyl acetal resin in the thermoplastic resin is larger than 85 mass% and 100 mass% or smaller based on an amount of the thermoplastic resin. A content of the plasticizer is 0 to 22 mass% based on the amount of polyvinyl acetal resin.SELECTED DRAWING: Figure 1

Description

The present invention relates to a resin material for an interlayer film of a laminated glass, a film material for an interlayer film of a laminated glass, and a laminated glass.

Conventionally, laminated glass, which is less likely to scatter when damaged, is widely used as glass for vehicles such as automobiles, aircraft, buildings, and the like. Laminated glass generally has an interlayer film sandwiched between two glass plates. As the interlayer film for laminated glass, for example, a resin layer containing a polyvinyl acetal resin, an ionoma resin, an acrylic resin, or the like is used (for example, Patent Documents 1 to 10).

Japanese Unexamined Patent Publication No. 2016-193542 Japanese Unexamined Patent Publication No. 2009-298046 JP-A-2015-151540 Special Publication No. 62-0288105 Japanese Unexamined Patent Publication No. 2000-001345 Japanese Patent No. 6163259 Japanese Patent No. 6147421 International Publication No. 2016/158696 Japanese Unexamined Patent Publication No. 2017-171574 International Publication No. 2017/171043

Glass members such as windshields used in automobile applications are required to have excellent resistance to collisions with scattered objects such as stepping stones during traveling, that is, excellent chipping resistance. On the other hand, in order to reduce the weight of the glass member, it is desirable that the glass plate is as thin as possible. However, when the glass plate becomes thin, it tends to be difficult to maintain sufficient chipping resistance.

Therefore, an object of one aspect of the present invention is to further improve the chipping resistance of the laminated glass.

One aspect of the present invention relates to a resin material for an interlayer film of laminated glass, which contains a thermoplastic resin containing a polyvinyl acetal resin and may further contain a plasticizer. The proportion of the polyvinyl acetal resin in the thermoplastic resin is more than 85% by mass and 100% by mass or less based on the amount of the thermoplastic resin. The content of the plasticizer is 0 to 18% by mass or less based on the amount of the polyvinyl acetal resin. Another aspect of the present invention relates to a film material for an interlayer film of laminated glass, which has a resin layer made of the resin material.

Laminated glass to which an interlayer film having a resin layer made of the resin material is applied can exhibit excellent chipping resistance even when the glass plate is thin.

Another aspect of the present invention relates to laminated glass comprising two opposing glass plates and an interlayer film arranged between them. The interlayer film has a resin layer made of a resin material for an interlayer film of the laminated glass. This laminated glass can exhibit excellent chipping resistance even when the glass plate is thin.

According to one aspect of the present invention, there is provided a resin material for an interlayer film of a laminated glass, which enables further improvement of the chipping resistance of the laminated glass.

It is sectional drawing which shows one Embodiment of laminated glass. It is sectional drawing which shows one Embodiment of laminated glass. It is sectional drawing which shows one Embodiment of the film material for the interlayer film of laminated glass. It is sectional drawing which shows one Embodiment of the film material for the interlayer film of laminated glass.

Hereinafter, some embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

(Resin material for interlayer film of laminated glass)
The resin material according to one embodiment contains a thermoplastic resin containing a polyvinyl acetal resin. This resin material can be used to form a resin layer constituting an interlayer film of laminated glass.

Alternatively, the resin material according to this embodiment can be used as an image display member used in an image display device such as an organic electroluminescence (organic EL) or a liquid crystal display, a protective material for the image display member, or a shock absorber for the image display member. Can also be used.

The polyvinyl acetal resin usually has an acetal unit represented by the following formula (1) and a hydroxyl group unit represented by the following formula (2). The polyvinyl acetal resin may further have a vinyl acetate unit represented by the following formula (3). R in the formula (1) represents an alkyl group having 1 to 3 carbon atoms. A plurality of Rs in the same molecule may be the same or different. R may be a methyl group or a butyl group.

The content of the acetal unit may be 65% by mass or more, 68% by mass or more, or 71% by mass or more, and 90% by mass or less, based on the total amount of the acetal unit, the hydroxyl group unit, and the vinyl acetate unit. It may be 88% by mass or less, or 81% by mass or less. The content of the hydroxyl group is 10% by mass or more, 11% by mass or more, 14% by mass or more, 18% by mass or more or 19% by mass or more, 21 based on the total amount of the acetal unit, the hydroxyl group unit and the vinyl acetate unit. It may be 3% by mass or more, or 24% by mass or more, and may be 35% by mass or less, 27% by mass or less, or 26% by mass or less. By using a polyvinyl acetal resin having a relatively large hydroxyl group unit content and reducing the amount of the plasticizer, it is easy to obtain a laminated glass having particularly excellent chipping resistance. When the content of the hydroxyl group unit is large, the storage elastic modulus at high frequencies tends to be high. The high storage elastic modulus of the resin layer at high frequencies is advantageous in terms of improving the chipping resistance of the laminated glass. By using polyvinyl acetal having a high content of hydroxyl group units, it is easy to maintain a high storage elastic modulus at a high frequency of the resin layer even when the resin material contains a plasticizer described later in a certain amount. When the resin material contains a certain amount of plasticizer, the fluidity of the resin material becomes high, so that it is easy to avoid problems such as mixing of air bubbles in the interlayer film in the process of manufacturing the laminated glass.

The weight average molecular weight of the polyvinyl acetal resin may be 10,000 or more, 25,000 or more, 50,000 or more, 70,000 or more, 80,000 or more, or 95,000 or more, and may be 200,000 or less, 150,000 or less, 120,000 or less, or 105,000 or less. .. When the weight average molecular weight of the polyvinyl acetal resin is large, the chipping resistance of the laminated glass tends to be further improved. When the weight average molecular weight of the polyvinyl acetal resin is small, the resin layer tends to be easily formed, and the interlayer film and the glass plate tend to be easily bonded to each other. The weight average molecular weight here is a conversion value based on standard polystyrene obtained by gel permeation chromatography.

The resin material according to the present embodiment may contain a polyvinyl acetal resin and other thermoplastic resins. The ratio of the polyvinyl acetal resin to the total amount of the polyvinyl acetal resin and other thermoplastic resins may be more than 85% by mass, 90% by mass or more, or 95% by mass or more.

Examples of other thermoplastic resins include acrylic resins (acrylic polymers), ethylene-vinyl acetate copolymer resins, ethylene-acrylic acid copolymer resins, polyurethane resins and polyvinyl alcohol resins.

The resin material according to the present embodiment may or may not contain a plasticizer. The content of the plasticizer in the resin material or the resin layer formed from the resin material may be 0 to 22% by mass based on the amount of the polyvinyl acetal resin. When the content of the plasticizer is 22% by mass or less, the chipping resistance of the laminated glass is remarkably improved. From the same viewpoint, the content of the plasticizer is 20% by mass or less, 19% by mass or less, 18% by mass or less, 17% by mass or less, 16% by mass or less, 15% by mass or less, based on the amount of polyvinyl acetal resin. 14% by mass or less, 13% by mass or less, 12% by mass or less, 11% by mass or less, 10% by mass or less, 9% by mass or less, 8% by mass or less, 7% by mass or less, 6% by mass or less, or 5% by mass or less. May be.

The plasticizer can be selected without particular limitation from those usually used as a plasticizer for polyvinyl acetal resin. For example, the plasticizer may contain a fatty acid ester compound, an organic phosphate ester compound, or a combination thereof.

The aliphatic ester compound may be, for example, a monoester or a diester of a polyalkylene glycol and an aliphatic monocarboxylic acid. Examples of polyalkylene glycols include triethylene glycol, tetraethylene glycol and tripropylene glycol. Examples of aliphatic monocarboxylic acids include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptyl acid, n-octyl acid, 2-ethylhexic acid, n-nonyl acid and decyl acid. The aliphatic ester compound may be an ester of a linear or branched alkyl alcohol having 4 to 8 carbon atoms and an aliphatic polycarboxylic acid. Examples of aliphatic polycarboxylic acids include adipic acid, sebacic acid and azelaic acid.

The plasticizers include, for example, triethylene glycol mono (2-ethylhexanoate), triethylene glycol di (2-ethylhexanoate), triethylene glycol di-2-ethylbutyrate, and triethylene glycol di (2). -It may contain at least one aliphatic ester compound selected from (ethylpropanoate).

Examples of organic phosphate compounds include tributoxyethyl phosphate, isodecylphenyl phosphate and triisopropyl phosphate.

The resin material according to this embodiment may contain other components if necessary. Examples of other components include antioxidants and inorganic fillers. The ratio of the total amount of the polyvinyl acetal resin and the plasticizer in the resin material may be 80% by mass or more or 90% by mass or more based on the amount of the resin material.

(Laminated glass)
FIG. 1 is a cross-sectional view showing an embodiment of laminated glass. The laminated glass 1 shown in FIG. 1 includes two opposing glass plates 11 and 12 and an interlayer film 5 arranged between the two glass plates 11 and 12.

The glass plates 11 and 12 may be, for example, an inorganic glass plate such as float glass, air-cooled tempered glass, chemically tempered glass, and double glazing. One or both of the glass plates 11 and 12 may be a transparent substrate made of resin. Examples of the transparent substrate include a transparent plastic substrate such as an acrylic resin substrate, a polycarbonate substrate, a cycloolefin polymer substrate, and a polyester substrate.

The thickness of one glass plate 11 is larger than the thickness of the other glass plate 12. When used as a glass member of a vehicle (eg, a windshield for an automobile), the laminated glass 1 is usually mounted on the vehicle with a thicker glass plate 11 oriented on the outside of the vehicle. The ratio of the thickness of the glass plate 11 to the thickness of the glass plate 12 may be, for example, 1.1 to 3.0. However, the thickness of the two glass plates may be the same. The thickness of the glass plates 11 and 12 may be, for example, 0.1 mm or more, 0.5 mm or more, or 0.8 mm or more. The thickness of the glass plate 11 may be 30 mm or less, or 20 mm or less. The thickness of the glass plate 12 may be 20 mm or less, or 15 mm or less.

The interlayer film 5 has a first resin layer 20 and a second resin layer 21 as an additional resin layer. At least one of the first resin layer 20 and the second resin layer 21 is a resin layer made of the resin material according to the above-described embodiment (hereinafter, may be referred to as a “chipping resistant layer”). The thermoplastic resin may be crosslinked in the chipping resistant layer.

The first resin layer 20 arranged at a position adjacent to the thicker glass plate 11 may be a chipping resistant layer. As a result, when the laminated glass 1 is mounted on the vehicle with the glass plate 11 located on the outside of the vehicle, the effect of improving the chipping resistance against scattered objects colliding from the outside is particularly effectively exhibited.

When the first resin layer 20 is a chipping resistant layer, its thickness is 0.001 to 1.0 mm, 0.001 to 0.3 mm, or 0.01 to 0 from the viewpoint of improving the chipping resistance. .1 mm may be used. When the chipping resistance layer is thick, the film material described later tends to be handled well. When the chipping resistance layer is thin, the penetration resistance of the laminated glass tends to be further improved.

The storage elastic modulus measured at a frequency of 150 Hz by the nanoindentation method of the chipping resistant layer may be 200 MPa or more, 550 MPa or more, or 1000 MPa or less at 25 ° C. When the storage elastic modulus of the chipping resistance layer is within these ranges, the chipping resistance of the laminated glass tends to be further improved.

When the first resin layer 20 is a chipping resistant layer, the second resin layer 21 can be a functional layer having various functions. For example, the second resin layer may be a functional layer having penetration resistance, sound insulation, or both functions. The functional layer having a sound insulating function (hereinafter, may be referred to as “sound insulating layer”) is a layer for improving the sound insulating property by the laminated glass. The layer having a penetration-resistant function (hereinafter, may be referred to as “penetration-resistant layer”) is a layer that makes it difficult for scattered matter that has collided with the laminated glass to penetrate the laminated glass. The second resin layer 21 may also serve as a sound insulating layer and a penetration resistant layer. The thickness of the second resin layer 21 may be, for example, 0.1 to 10 mm.

In addition to the first resin layer 20 and the second resin layer 21, an additional resin layer having a predetermined function may be further provided. For example, the laminated glass 1 according to the embodiment shown in FIG. 2 has an interlayer film 5 including a first resin layer 20, a second resin layer 21, a third resin layer 22, and a fourth resin layer 23. Have. The first resin layer 20, the second resin layer 21, the third resin layer 22, and the fourth resin layer 23 are laminated in this order from the side of the thicker glass plate 11. Even if the first resin layer 20 is a chipping resistant layer, the second resin layer 21 is a penetration resistant layer, the third resin layer is a sound insulating layer, and the fourth resin layer is a penetrating resistant layer. good.

As the sound insulating layer, an interlayer film known to those skilled in the art as an interlayer film having sound insulating properties can be adopted (see, for example, Patent Documents 6 to 10). For example, the sound insulating layer may contain 100 parts by mass of a thermoplastic resin and 20 to 80 parts by mass, or 50 to 80 parts by mass of a plasticizer. The thickness of the sound insulation layer may be 20 μm or more, 200 μm or less, or 100 μm or less. The penetration resistant layer may contain 100 parts by mass of a thermoplastic resin and 20 to 50 parts by mass, 20 to 40 parts by mass or 20 to 35 parts by mass of a plasticizer. The thickness of the penetration-resistant layer may be 50 μm or more, 300 μm or more, 1000 μm or less, or 800 μm or less. When two or more penetration-resistant layers are provided, the total thickness thereof may be within the above numerical range.

The thermoplastic resin contained in the sound insulating layer and the penetration resistant layer may contain, for example, a polyvinyl acetal resin, or may contain a polyvinyl acetal resin and a polyacrylic resin (poly (meth) acrylic acid ester). As the plasticizer, the same one as the chipping resistance can be used. The sound insulation layer may further contain at least one metal salt of an alkali metal salt or an alkaline earth metal salt. The sound insulation layer having these configurations can usually also have a penetration resistance function.

The laminated glass 1 is particularly useful as a laminated glass for vehicles that requires chipping resistance. Examples of laminated glass for vehicles include windshields for automobiles, side glasses for automobiles, sunroofs for automobiles, and rear glass for automobiles.

(Manufacturing method of laminated glass)
The laminated glass 1 is, for example, a step of forming a laminated body having two opposing glass plates 11 and 12 and an interlayer film arranged between them, and heating and pressurizing the laminated body to form the laminated glass 1. It can be produced by a method including a step of forming.

For the laminate having the glass plate and the interlayer film, for example, the first resin layer 20 and the second resin layer 21 are laminated in order on one of the glass plates 11 to form the interlayer film 5, and the interlayer film 5 is formed. It can be obtained by a method including attaching the other glass plate 12 to 5.

In order to form the laminate, for example, a film material having a resin layer constituting an interlayer film may be used. FIG. 3 is a cross-sectional view showing an embodiment of a film material for an interlayer film whose mating is glass. The film material 2 shown in FIG. 3 includes an interlayer film 5 having a first resin layer 20 and a second resin layer 21, and two base films 31 and 32 covering both sides of the interlayer film 5. For example, the base film 31 may be peeled off from the film material 2 and the exposed interlayer film 5 may be attached to the glass plate 11. One base film 31 may be a film having a surface that is lighter than the surface of the other base film 32. One or both of the base film 31 and the base film 32 may not be provided.

Examples of the base films 31 and 32 include polyethylene terephthalate films, polypropylene films, and polyethylene films. For example, the thicknesses of the base films 31 and 32 are not particularly limited, but may be, for example, 25 to 200 μm.

FIG. 4 is a cross-sectional view showing another embodiment of the film material for an interlayer film of laminated glass. The film material 2 shown in FIG. 4 includes a first resin layer 20 and base films 31 and 32 covering both sides of the first resin layer 20. For example, by a method including using this film material 2 to bond the first resin layer 20 to one glass plate 11 and then laminating the second resin layer 21 on the first resin layer 20. The interlayer film 5 can be formed.

The first resin layer 20 and the second resin layer 21 are, for example, a method of press-molding a resin material for forming these resin layers, or a coating liquid containing a resin material and a solvent is applied to a base film or the like. Then, it can be formed by a method of removing the solvent from the coating film.

The conditions of heating and pressurizing the laminated body composed of the glass plate 11, the interlayer film 5, and the glass plate 12 in order to obtain a laminated glass are adjusted so that the layers are sufficiently adhered to each other. For example, heating and pressurizing conditions are set within a pressure range of 0.8 to 10 MPa, a temperature of 60 to 200 ° C., and a pressurizing time of 10 to 200 minutes.

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

<Examination 1>
1-1. Resin layer for interlayer film (Example 1)
Polyvinyl butyral (PVB) resin (Moital B75H, manufactured by Kuraray, acetal unit: 78.7% by mass, hydroxyl group unit: 20.4% by mass, vinyl acetate unit: 0.8% by mass) at 150 ° C. and 30% by mass. Press molding was performed under the condition of minutes to form a resin layer for an interlayer film having a thickness of 0.76 mm.

(Example 2)
100 parts by mass of the same PVB resin as that of Example 1 and 10 parts by mass of triethylene glycol di (2-ethylhexanoate) (3GO) were mixed. The mixture was sufficiently melt-kneaded with a mixing roll to obtain a PVB resin composition as a resin material for an interlayer film. The obtained PVB resin composition was press-molded with a press molding machine at 150 ° C. for 30 minutes to form a resin layer for an interlayer film having a thickness of 0.76 mm.

(Example 3)
A resin layer for an interlayer film having a thickness of 0.76 mm was obtained in the same manner as in Example 2 except that the amount of triethylene glycol di (2-ethylhexanoate) (3GO) was changed to 15 parts by mass.

(Comparative Example 1)
A resin layer for an interlayer film having a thickness of 0.76 mm was obtained in the same manner as in Example 2 except that the amount of triethylene glycol di (2-ethylhexanoate) (3GO) was changed to 30 parts by mass.

(Comparative Example 2)
A non-crosslinkable ethylene-vinyl acetate copolymer (EVA) (EV170, manufactured by Mitsui DuPont Polychemical, vinyl acetate content: 33% by mass) was press-molded with a press molding machine at 150 ° C. for 30 minutes. A resin layer for an interlayer film having a thickness of 0.76 mm was formed.

1-2. Preparation of laminated glass Each resin layer for interlayer film is cut into a size of 110 mm in length and 110 mm in width, and bonded to float glass having a length of 110 mm, a width of 110 mm and a thickness of 1.6 mm so that four sides overlap each other. Pressurized with a roller. Float glass having a length of 110 mm, a width of 110 mm, and a thickness of 1.1 mm was attached onto the exposed resin layer so that the four sides overlapped, and the whole was pressed with a roller. As a result, a laminated body of float glass / interlayer film / float glass was obtained. The obtained laminate was heated for 25 minutes using a vacuum laminator set at 125 ° C. Subsequently, in an autoclave set at 150 ° C., the laminate was heated and pressurized under the conditions of a pressure of 1.2 MPa and 120 minutes to form a float glass (1.6 mm) / interlayer film / float glass (1.1 mm). A laminated glass having a composition was obtained. By the same operation, 10 laminated glasses were prepared using each interlayer film resin layer.

1-3. Chipping resistance of laminated glass Adhesive tape was attached at a position within 5.0 mm from the edge along each of the four sides of the float glass with a thickness of 1.1 mm of the laminated glass. The laminated glass was fixed to a supporting glass plate having a thickness of 10 mm via an adhesive tape. Next, one crushed stone (basalt) weighing about 0.15 g ± 0.01 g was made to collide with the thick 1.6 mm float glass side surface of the laminated glass by an air gun. The collision speed was set to 145 to 165 km / h, and the collision incident angle was set to 0 degrees. Twenty crushed stones were made to collide with one laminated glass while moving the collision position. Each collision mark was observed, and the number of collision marks (number of cracks generated) in which linear cracks of 0.5 mm or more were generated was recorded. The NG rate was calculated by the following formula.
NG rate (%) = (number of cracks generated / 20) x 100
A similar test was carried out on five laminated glasses, and the average value of the NG rate was obtained. The chipping resistance of the laminated glass was evaluated according to the following criteria based on the average value of the NG rate. As for the chipping resistance of the laminated glass, "S" is the best and "D" is the worst.
S: Less than 5.0% A: 5.0% or more and less than 10.0% B: 10.0% or more and less than 15.0% C: 15.0% or more and less than 20.0% D: 20. 0% or more

Table 1 shows the evaluation results. The laminated glass of Examples 1 to 3 having a resin layer having a resin layer having a plasticizer content of 18% by mass or less based on the amount of polyvinyl butyral resin as an interlayer film was compared with the laminated glass of Comparative Examples 1 to 3. It showed specifically excellent chipping resistance.

<Examination 2>
2-1. Polyvinyl butyral resin The polyvinyl butyral resin shown in Table 2 was prepared.

2-2. Resin layer for interlayer film (chipping resistant layer)
PVBs 1 to 8 were press-molded with a press molding machine at 150 ° C. for 30 minutes to form a resin layer as a chipping resistant layer having a thickness of 0.1 mm. 100 parts by mass of PVB-4 and 11 to 43 parts by mass of 3GO as a plasticizer were mixed. The mixture was sufficiently melt-kneaded with a mixing roll to obtain a PVB resin composition. The obtained PVB resin composition was press-molded with a press molding machine at 150 ° C. for 30 minutes to form a resin layer as a chipping resistant layer having a thickness of 0.1 mm.

(Penetration resistant layer)
100 parts by mass of PVB-9 and 33 parts by mass of triethylene glycol di (2-ethylhexanoate) (3GO) as a plasticizer were mixed. The mixture was sufficiently melt-kneaded with a mixing roll to obtain a PVB resin composition. The obtained PVB resin composition was press-molded with a press molding machine at 150 ° C. for 30 minutes to form a resin layer for a penetration-resistant layer having a thickness of 0.8 mm or 0.4 mm.

(Sound insulation layer)
100 parts by mass of PVB-10 and 57 parts by mass of 3GO as a plasticizer were mixed. The mixture was sufficiently melt-kneaded with a mixing roll to obtain a PVB resin composition. The obtained PVB resin composition was press-molded with a press molding machine at 150 ° C. for 30 minutes to form a resin layer as a sound insulation layer having a thickness of 0.1 mm.

2-3. Laminated glass According to the following procedure, Examples 12 to 11 have a laminated glass of Examples 4 to 11 having a single layer of a chipping resistant layer as an interlayer film, and an interlayer film having a two-layer structure of a chipping resistant layer / a penetration resistant layer. 26 and the laminated glass of Examples 27 to 33 having the laminated glass of Comparative Examples 3 to 8 and the interlayer film having a four-layer structure of a chipping resistant layer / a penetration resistant layer / a sound insulating layer / a penetrating resistant layer were prepared. ..

(Laminated glass for chipping resistance evaluation)
Each resin layer was cut into a size of 110 mm in length and 110 mm in width. The resin layers of the combinations shown in Tables 3 to 6 were superposed on float glass having a length of 110 mm, a width of 110 mm, and a thickness of 1.5 mm in order so that the four sides overlapped, and the whole was pressed with a roller. Float glass having a length of 110 mm, a width of 110 mm, and a thickness of 1.0 mm was attached onto the exposed resin layer so that the four sides overlapped, and the whole was pressed with a roller. As a result, a laminated body of float glass / interlayer film / float glass was obtained. The obtained laminate was heated for 25 minutes using a vacuum laminator set at 125 ° C. Subsequently, the laminate was heated and pressurized under the conditions of 1.2 MPa and 120 minutes in an autoclave set at 150 ° C. to form a float glass (1.5 mm) / interlayer film / float glass (1.0 mm). A laminated glass having the above was obtained.

(Laminated glass for penetration resistance test)
Float glass (1.5 mm) / interlayer film / float glass (1.0 mm) in the same manner as laminated glass for chipping resistance evaluation except that the sizes of the resin layer and float glass have been changed to 3000 mm in length and 3000 mm in width. A laminated glass for a penetration resistance test having the above structure was produced.

(Sample for sound insulation test)
Each resin layer was cut into a size of 3000 mm in length and 25 mm in width. The resin layers of the combinations shown in Tables 3 to 6 were superposed on a float glass having a length of 3000 mm, a width of 25 mm, and a thickness of 2.7 mm in order so that the four sides overlapped, and the whole was pressed with a roller. Float glass having a length of 3000 mm, a width of 25 mm, and a thickness of 1.0 mm was attached onto the exposed resin layer so that the four sides overlapped, and the whole was pressed with a roller. As a result, a laminated body of float glass / interlayer film / float glass was obtained. The obtained laminate was heated for 25 minutes using a vacuum laminator set at 125 ° C. Subsequently, the laminate was heated and pressurized at 1.2 MPa for 120 minutes in an autoclave set at 150 ° C. to form a float glass (2.7 mm) / glass interlayer film / float glass (2.7 mm). A laminated glass having a composition was obtained.

2-4. Storage elastic modulus of chipping resistant layer A strip-shaped test piece having a width of 10 mm and a length of 10 mm was cut out from the resin layer as the chipping resistant layer. The nanodynamic viscoelasticity of the test piece was measured using a nanodynamic viscoelasticity measuring machine (KLA-Tekor, G200 type nanoindenter) under the following measurement conditions.
Measuring head: High resolution DCM-II head indenter: Flat punch indenter (diameter 100 μm and 50 μm)
Measurement mode: Viscoelasticity test Pushing depth: 5 μm (when flat punch indenter diameter 100 μm)
1 μm (when the flat punch indenter diameter is 50 μm)
Frequency range: 150Hz
Measurement temperature: 25 ° C
Poisson's ratio: 0.35
Number of measurement points: 10 points (calculate the average value from the measured values of 10 points)

2-5. Chipping resistance of laminated glass The chipping resistance of each laminated glass was evaluated by the same procedure as in Examination 1.

2-6. Penetration resistance of laminated glass The surface temperature of 10 laminated glasses was adjusted to 20 ° C. Then, a hard ball having a mass of 2260 g and a diameter of 82 mm was dropped from a height of 4.0 m toward the central portion of the 10 laminated glasses. For all 10 laminated glasses, the number of laminated glasses penetrated by the hard sphere was recorded within 5 seconds after the hard sphere collided. Penetration resistance was determined according to the following criteria based on the number of laminated glasses penetrated by the hard sphere.
[Penetration resistance criteria]
A: 2 or less laminated laminated glass penetrated B: 3 or more laminated laminated glass penetrated

2-7. The loss coefficient of the sound-insulating laminated glass was measured by the central vibration method while changing the frequency in a 20 ° C environment using a vibration damping material evaluation system (manufactured by Brüel & Kjä Division, Spectris Co., Ltd.). The loss coefficient for each frequency was calculated using the loss coefficient measurement software MS18143. The loss coefficient near the frequency of 3,000 Hz was read from the measurement results, and the sound insulation was judged according to the following criteria.
A: Loss coefficient is 0.2 or more B: Loss coefficient is 0.1 or more and less than 0.2 C: Loss coefficient is less than 0.1

1 ... Laminated glass, 2 ... Laminated glass film material for interlayer film, 5 ... Intermediate film, 11, 12 ... Glass plate, 20 ... First resin layer, 21 ... Second resin layer, 22 ... Third resin Layer, 23 ... 4th resin layer, 31, 32 ... Base film.

Claims (7)

A resin material for an interlayer film of laminated glass, which contains a thermoplastic resin containing a polyvinyl acetal resin and may further contain a plasticizer.
The proportion of the polyvinyl acetal resin in the thermoplastic resin is more than 85% by mass and 100% by mass or less based on the amount of the thermoplastic resin.
A resin material for an interlayer film of laminated glass, wherein the content of the plasticizer is 0 to 22% by mass based on the amount of the polyvinyl acetal resin. The polyvinyl acetal resin has an acetal unit represented by the following formula (1) and a hydroxyl group unit represented by the following formula (2), and further has a vinyl acetate unit represented by the following formula (3). May,

R in the formula (1) represents an alkyl group having 1 to 3 carbon atoms.
Claimed that the content of the acetal unit is 71 to 88% by mass and the content of the hydroxyl group unit is 18 to 27% by mass based on the total amount of the acetal unit, the hydroxyl group unit, and the vinyl acetate unit. Item 2. The resin material for an interlayer film of laminated glass according to Item 1. The resin material for an interlayer film of a laminated glass according to claim 1 or 2, wherein the polyvinyl acetal resin has a weight average molecular weight of 25,000 to 105,000. A film material for an interlayer film of a laminated glass having a resin layer made of the resin material for an interlayer film of a laminated glass according to any one of claims 1 to 3. Two glass plates facing each other and
With the interlayer placed between them,
Equipped with
A laminated glass having a resin layer made of the resin material for an interlayer film of the laminated glass according to any one of claims 1 to 3. The laminated glass according to claim 5, wherein the two glass plates have different thicknesses, and the resin layer is adjacent to the thicker glass plate. The laminated glass according to claim 5 or 6, wherein the thickness of the resin layer is 0.001 to 0.3 mm.

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