JP2021088500A - Laminated glass, and method for manufacturing laminated glass - Google Patents

Abstract

To provide laminated glass which can prevent gas generated from an intermediate resin layer from remaining between a pair of glass plates in fire, and a method for manufacturing laminated glass.SOLUTION: Laminated glass 11 has a laminated structure having a pair of glass plates 12, and an intermediate resin layer 13 provided between the pair of glass plates 12. The intermediate resin layer 13 of the laminated glass 11 has an adhesive part 14 bonded to the glass plate 12, and a low adhesive part 15 having an adhesive strength to the glass plate 12 lower than the adhesive part 14. The low adhesive part 15 of the intermediate resin layer 13 extends toward inside of an outer peripheral end edge 13a of the intermediate resin layer 13 from the outer peripheral end edge 13a of the intermediate resin layer 13 in plan view.SELECTED DRAWING: Figure 1

Description

The present invention relates to a laminated glass and a method for producing the laminated glass.

Conventionally, as disclosed in Patent Documents 1 to 3, laminated glass used as, for example, fireproof glass is known. Such a laminated glass has a laminated structure of a pair of glass plates and an intermediate resin layer provided between the pair of glass plates.

Japanese Unexamined Patent Publication No. 2016-088813 Japanese Unexamined Patent Publication No. 2015-171983 Japanese Unexamined Patent Publication No. 2017-036181

In the above-mentioned laminated glass, when the glass surface of the laminated glass is heated in the event of a fire, gas is generated from the intermediate resin layer as the temperature of the intermediate resin layer of the laminated glass rises. When the gas generated from the intermediate resin layer stays between the pair of glass plates, unnecessary pressure is applied to the glass plates. Unnecessary pressure applied to the glass plate in this way contributes to damage to the laminated glass. Therefore, in order to improve the fire protection performance of the laminated glass, it is preferable to prevent the gas generated from the intermediate resin layer from staying between the pair of glass plates in the event of a fire.

The present invention has been made in view of such circumstances, and an object of the present invention is a laminated glass capable of suppressing gas generated from an intermediate resin layer from staying between a pair of glass plates in the event of a fire, and a laminated glass. The purpose is to provide a method for producing glass.

The laminated glass that solves the above problems is a laminated glass having a laminated structure of a pair of glass plates and an intermediate resin layer provided between the pair of glass plates, and the intermediate resin layer adheres to the glass plates. The laminated portion is provided with a low adhesive portion having a lower adhesive strength to the glass plate than the adhesive portion, and the low adhesive portion is formed from the outer peripheral edge of the intermediate resin layer to the intermediate resin layer in a plan view. It extends toward the inside of the glass.

As described above, since the intermediate resin layer of the laminated glass has a low adhesive portion having a lower adhesive strength to the glass plate than the adhesive portion, the intermediate resin layer is low when the laminated glass is heated in the event of a fire. A gap is likely to be formed between the adhesive portion and the glass plate. Further, the low adhesive portion of the intermediate resin layer extends inward from the outer peripheral edge of the intermediate resin layer in a plan view. Therefore, the gap between the low-adhesion portion of the intermediate resin layer and the glass plate serves as a discharge path for discharging the gas between the intermediate resin layer and the glass plate to the outer peripheral edge of the intermediate resin layer. This makes it possible to promote the discharge of gas between the intermediate resin layer and the glass plate.

The "low-adhesive portion having a lower adhesive strength to the glass plate than the adhesive portion" is a portion having no adhesive strength at all, or a portion that adheres but has a lower adhesive strength than the adhesive portion.
Further, the "low adhesive portion" is a portion having a portion having a lower adhesive strength to the glass plate than the adhesive portion. For example, as shown in FIG. 13 described later, one of the intermediate resin layers is attached to the glass plate rather than the adhesive portion. It also includes a case where the portion has a low adhesive strength and the other has a portion having an adhesive strength equivalent to that of the adhesive portion.

In the laminated glass, the low-adhesive portion extends from the first low-adhesive portion extending from the first outer peripheral edge of the intermediate resin layer and from the second outer peripheral edge at a position different from the first outer peripheral edge. It is preferable to have a second low-adhesion portion that is present.

According to this configuration, since a plurality of discharge paths can be formed between the intermediate resin layer and the glass plate, the discharge of gas between the intermediate resin layer and the glass plate can be further promoted.
In the laminated glass, it is preferable that the first low-adhesion portion and the second low-adhesion portion are arranged so as to be connected inside the intermediate resin layer in a plan view.

According to this configuration, the discharge of gas between the intermediate resin layer and the glass plate can be further promoted by the discharge path connected between the first outer peripheral edge and the second outer peripheral edge of the intermediate resin layer.
In the laminated glass, the intermediate resin layer has a resin base material layer and adhesive layers provided on both main surfaces of the resin base material layer, and the low adhesive portion is the resin base material layer and the said resin base material layer. Of the adhesive layers, it is preferable to have only the resin base material layer.

According to this configuration, the adhesive strength of the low-adhesive portion to the glass plate can be easily reduced.
In the laminated glass, the resin base material layer is preferably composed of a fluororesin.

According to this configuration, it is possible to further improve the fire protection performance of the laminated glass.
The method for producing a laminated glass is a method for producing a laminated glass having a laminated structure of a pair of glass plates and an intermediate resin layer provided between the pair of glass plates, the pair of glass plates and the pair. A laminate forming step of forming a laminate having a laminated structure with an intermediate film layer in which a resin film is arranged between glass plates, and heating the laminate to bond the intermediate film layer and the pair of glass plates. The intermediate resin layer forming step of forming the intermediate resin layer is provided, and the intermediate film layer of the laminated body has a discontinuous portion in which the end faces of the resin films face each other, and the discontinuous portion is In a plan view, it extends from the outer peripheral edge of the intermediate film layer toward the inside of the intermediate film layer, and in the intermediate resin layer forming step, the gas between the pair of glass plates is passed through the discontinuous portion to the intermediate film. By discharging from the outer peripheral edge of the layer and welding the discontinuous portion, a low adhesive portion having a lower adhesive strength to the glass plate than other portions is formed.

According to this method, the discontinuous portion of the intermediate film layer serves as an degassing path for degassing between the pair of glass plates, so that the gap between the pair of glass plates can be smoothly degassed.
In the method for producing a laminated glass, the resin film may have a film base material layer and a film adhesive layer provided on both main surfaces of the film base material layer.

In the method for producing a laminated glass, it is preferable that the laminate forming step is performed in an atmosphere having a relative humidity of 60% or less.
Here, since the resin film having good adhesiveness to the glass plate tends to have relatively high hydrophilicity, the resin film may be discolored due to the influence of the environmental humidity in which the laminate forming step is performed. When moisture absorption progresses near the end face of the resin film, white streaks may be easily visible along the low-adhesion portion in the obtained laminated glass. As described above, in the method for producing laminated glass, by performing the laminate forming step in an atmosphere having a relative humidity of 60% or less, it is possible to suppress moisture absorption in the vicinity of the end face of the resin film. This makes it difficult to see the white streaks along the low-adhesion portion, and makes the white streaks invisible.

In the method for producing a laminated glass, the resin film includes a first resin film and a second resin film, and in the laminate forming step, the outer peripheral end face of the first resin film and the second resin film It is preferable to form the discontinuous portion by arranging the outer peripheral end faces of the above surface so as to face each other.

According to this method, for example, a laminated glass can be obtained by using a resin film having an area smaller than the area of the glass plate surface. Therefore, for example, it is possible to obtain a laminated glass having a larger external dimension by using a resin film having existing dimensions.

According to the present invention, it is possible to prevent the gas generated from the intermediate resin layer from staying between the pair of glass plates in the event of a fire.

It is a top view which shows by cutting out a part of the laminated glass in this embodiment. It is a partial cross-sectional view along line 2-2 of FIG. It is sectional drawing which shows the main part of FIG. 2 in an enlarged manner. It is sectional drawing which follows the 4-4 line of FIG. It is sectional drawing explaining the operation of the laminated glass. It is a perspective view explaining the laminated body formation process. It is a top view which shows by cutting out a part of a laminated body. It is a partial cross-sectional view along the line 8-8 of FIG. It is sectional drawing which shows the main part of FIG. 8 enlarged. (A) and (b) are plan views showing a part of the laminated glass of the modified example cut out. (A) and (b) are plan views showing a part of the laminated glass of the reference example cut out. It is a temperature profile in the heating test of laminated glass. It is sectional drawing which shows the main part of the modification of the laminated glass in an enlarged manner.

Hereinafter, an embodiment of a laminated glass and a method for manufacturing a laminated glass will be described with reference to the drawings. In the drawings, for convenience of explanation, a part of the configuration may be exaggerated or simplified. In addition, the dimensional ratio of each part may differ from the actual one.

As shown in FIGS. 1 and 2, the laminated glass 11 of the present embodiment has a laminated structure of a pair of glass plates 12 and an intermediate resin layer 13 provided between the pair of glass plates 12. .. Examples of the glass plate 12 include silicate glass, silica glass, borosilicate glass, soda lime glass, aluminosilicate glass, alkali-free glass, and crystallized glass. The glass plate 12 may be tempered glass, which is air-cooled or chemically strengthened glass, or unreinforced glass having a functional film such as an antireflection film formed on its surface. For example, laminated glass 11 using low thermal expansion glass such as crystallized glass is suitably used as, for example, fire safety safety glass. The thickness and external dimensions of the glass plate 12 are not particularly limited. The thickness of the glass plate 12 is preferably in the range of, for example, 2 mm or more and 10 mm or less. The types of the pair of glass plates 12 may be the same or different from each other. Further, the thickness of the pair of glass plates 12 may be the same or different from each other.

The intermediate resin layer 13 of the laminated glass 11 has an adhesive portion 14 that is adhered to the glass plate 12 and a low adhesive portion 15 that has a lower adhesive strength to the glass plate 12 than the adhesive portion 14 in a plan view. .. The low-adhesion portion 15 of the intermediate resin layer 13 extends from the outer peripheral edge of the intermediate resin layer 13 toward the inside of the intermediate resin layer 13 in a plan view.

The intermediate resin layer 13 of the laminated glass 11 extends from the first low-adhesion portion 15a extending from the first outer peripheral edge 13a and from the second outer peripheral edge 13b at a position different from the first outer peripheral edge 13a. 2 It has a low adhesive portion 15b. The first low-adhesion portion 15a and the second low-adhesion portion 15b are arranged so as to be connected inside the intermediate resin layer 13. The first low-adhesion portion 15a of the present embodiment extends from the first outer peripheral edge 13a of the intermediate resin layer 13 toward the central portion in a plan view. The second low-adhesion portion 15b extends from the second outer peripheral edge 13b of the intermediate resin layer 13 toward the central portion in a plan view. The first low-adhesion portion 15a and the second low-adhesion portion 15b are connected at the central portion of the intermediate resin layer 13 in a plan view.

As shown in FIG. 3, the intermediate resin layer 13 of the present embodiment has a resin base material layer L1 and an adhesive layer L2 provided on both main surfaces of the resin base material layer L1. The low adhesive portion 15 of the intermediate resin layer 13 has only the resin base material layer L1 of the resin base material layer L1 and the adhesive layer L2. The adhesive portion 14 of the intermediate resin layer 13 has both the resin base material layer L1 and the adhesive layer L2.

Examples of the resin constituting the resin base material layer L1 of the intermediate resin layer 13 include polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyethylene terephthalate (PET), polycarbonate (PC), and polyvinylidene chloride. (PVC), polyvinylidene chloride (PVDC), acrylic resin, fluororesin and the like can be mentioned. The resin base material layer L1 may have a single-layer structure or a multi-layer structure. From the viewpoint of further enhancing the fire protection performance of the laminated glass 11, the resin constituting the resin base material layer L1 is preferably a fluorine-based resin. Examples of the monomers constituting the fluororesin include tetrafluoroethylene (TFE), hexafluoropropylene (HFP), vinylidene fluoride (VDF), polychlorotrifluoroethylene (PCTFE), vinyl fluoride (VF), and par. Fluoroalkyl vinyl ether (PFA) and the like can be mentioned. As the fluororesin, tetrafluoroethylene (TFE) -hexafluoropropylene (HFP) -vinylidene fluoride (VDF) copolymer (THV) is preferable.

The thickness of the resin base material layer L1 is preferably in the range of, for example, 0.2 mm or more and 2 mm or less.
Examples of the adhesive constituting the adhesive layer L2 of the intermediate resin layer 13 include acrylic adhesives, fluorine adhesives, silicone adhesives, vinyl adhesives and the like. The adhesive preferably contains a silane coupling agent from the viewpoint of enhancing the adhesiveness with the glass plate 12. The thickness of the adhesive layer L2 is preferably in the range of 0.001 μm or more and 5 μm or less, for example.

Next, the operation of the laminated glass 11 will be described.
4 and 5 show the usage state of the laminated glass 11. When the glass surface of the laminated glass 11 is heated at the time of a fire, gas is generated from the intermediate resin layer 13 as the temperature of the intermediate resin layer 13 of the laminated glass 11 rises. At this time, since the intermediate resin layer 13 of the laminated glass of the present embodiment has a low adhesive portion 15 having a lower adhesive strength to the glass plate 12 than the adhesive portion 14, when the laminated glass 11 is heated in the event of a fire. In addition, a gap is likely to be formed between the low-adhesion portion 15 of the intermediate resin layer 13 and the glass plate 12. Further, the low adhesive portion 15 of the intermediate resin layer 13 extends inward from the outer peripheral edge of the intermediate resin layer 13 in a plan view. Therefore, the gap between the low-adhesion portion 15 of the intermediate resin layer 13 and the glass plate 12 allows the gas between the intermediate resin layer 13 and the glass plate 12 to pass through the intermediate resin layer 13 as shown by an arrow in FIG. It is a discharge route that discharges to the outer peripheral edge. Thereby, the discharge of gas between the intermediate resin layer 13 and the glass plate 12 can be promoted. In the present embodiment, the discharge path along the first low-adhesion portion 15a can promote the discharge of gas from the first outer peripheral edge 13a of the intermediate resin layer 13. In addition, the discharge path along the second low-adhesion portion 15b can promote the discharge of gas from the second outer peripheral edge 13b of the intermediate resin layer 13.

Next, a method of manufacturing the laminated glass 11 will be described.
As shown in FIGS. 6 and 7, the method for manufacturing the laminated glass 11 includes a laminate forming step of forming the laminate 16. The laminated body 16 has a laminated structure of a pair of glass plates 12 and an intermediate film layer 17 in which a resin film F is arranged between the pair of glass plates 12. In the present embodiment, the first resin film F1 and the second resin film F2 are used as the resin film F.

As shown in FIGS. 7 to 9, the intermediate film layer 17 of the laminated body 16 has a discontinuous portion 18 in which the end faces of the resin film F face each other. The discontinuous portion 18 of the intermediate film layer 17 extends from the outer peripheral edge of the intermediate film layer 17 toward the inside of the intermediate film layer 17 in a plan view.

The intermediate film layer 17 has a first discontinuous portion 18a extending from the first outer peripheral edge 17a and a second discontinuous portion extending from the second outer peripheral edge 17b at a position different from the first outer peripheral edge 17a. It has 18b and. The first discontinuous portion 18a and the second discontinuous portion 18b are connected inside the intermediate film layer 17 in a plan view. The first discontinuous portion 18a of the present embodiment extends from the first outer peripheral edge 17a of the intermediate film layer 17 toward the central portion in a plan view. The second discontinuous portion 18b extends from the second outer peripheral edge 17b of the intermediate film layer 17 toward the central portion in a plan view. The first discontinuous portion 18a and the second discontinuous portion 18b are connected at the central portion of the intermediate film layer 17 in a plan view.

In the laminate forming step, the discontinuous portion 18 of the intermediate film layer 17 is formed by arranging the outer peripheral end faces of the first resin film F1 and the outer peripheral end faces of the second resin film F2 so as to face each other.

As shown in FIG. 9, the intermediate film layer 17 of the present embodiment has a film base material layer L11 and a film adhesive layer L12 provided on both main surfaces of the film base material layer L11. The laminate forming step is preferably performed in an atmosphere having a relative humidity of 60% or less from the viewpoint of suppressing discoloration due to moisture absorption of the film adhesive layer L12.

Further, from the viewpoint of suppressing discoloration due to moisture absorption of the film adhesive layer L12, it is more preferable that the laminate forming step is performed in an atmosphere having a relative humidity of 30% or less and is completed within 1 hour.

The method for producing the laminated glass 11 further includes an intermediate resin layer forming step of forming the intermediate resin layer 13 from the intermediate film layer 17 by heating the laminated body 16 obtained in the laminated body forming step. In the intermediate resin layer forming step, the gas between the pair of glass plates 12 is discharged from the outer peripheral edge of the intermediate film layer 17 through the discontinuous portion 18, and the discontinuous portion 18 is welded to be shown in FIG. The low-adhesion portion 15 is formed.

More specifically, by evacuating the outer circumference of the laminated body 16, the gas between the pair of glass plates 12 can be discharged from the outer peripheral edge of the intermediate film layer 17 through the discontinuous portion 18. Specifically, the gas between the pair of glass plates 12 is discharged by a degassing process that evacuates the inside of the sealing member attached to the outer periphery of the laminated body 16 and the inside of the bag accommodating the laminated body 16 (patented). Reference 2). For example, immediately after the start of evacuation, the gas between the pair of glass plates 12 can be discharged from the continuous portion (resin film F) of the intermediate film layer 17 and the glass plates 12.

Further, by thermocompression bonding the intermediate film layer 17 of the laminated body 16 to the glass plate 12, the intermediate resin layer 13 having the low adhesive portion 15 can be formed. Specifically, the laminate 16 is heated and pressurized using an autoclave (see Patent Document 3).

Next, the operation of the method for producing the laminated glass 11 will be described.
In the intermediate resin layer forming step of the method for manufacturing the laminated glass 11, the gas between the pair of glass plates 12 is discharged from the outer peripheral edge of the intermediate film layer 17 through the discontinuous portion 18 of the intermediate film layer 17 in the laminated body 16. At the same time, the low adhesive portion 15 is formed by welding the discontinuous portion 18. According to this method, the discontinuous portion 18 of the intermediate film layer 17 serves as an degassing path for degassing between the pair of glass plates 12, so that the gap between the pair of glass plates 12 can be smoothly degassed. it can.

Further, in the intermediate resin layer forming step, the welded portion to which the discontinuous portion 18 of the intermediate film layer 17 is welded is less likely to receive the crimping force from the pair of glass plates 12 than the continuous portion of the intermediate film layer 17, so that the intermediate portion is intermediate. In a part of the resin layer 13, the adhesive strength to the glass plate 12 can be easily reduced. That is, in the intermediate resin layer 13 of the obtained laminated glass 11, the adhesive strength of the low adhesive portion 15 to the glass plate 12 can be easily reduced.

The intermediate film layer 17 of the present embodiment has a film base material layer L11 and a film adhesive layer L12 provided on both main surfaces of the film base material layer L11. In this case, in the intermediate resin layer forming step, the film base material layer L11 is more likely to flow by heating than the film adhesive layer L12 that adheres to the glass surface, so that the resin constituting the film base material layer L11 is preferentially discontinuous. By flowing into the portion 18, the low adhesive portion 15 having only the resin base material layer L1 among the resin base material layer L1 and the adhesive layer L2 can be formed. Since the low-adhesive portion 15 formed in this way does not have the adhesive layer L2, the adhesive strength of the low-adhesive portion 15 with respect to the glass plate 12 can be further reduced.

Next, a test example will be described.
(Sample A)
As shown in FIG. 7, sample A is a laminate 16 provided with an intermediate film layer 17 having a first discontinuous portion 18a and a second discontinuous portion 18b. This sample A was obtained by performing a laminate forming step of arranging the first resin film F1 and the second resin film F2 between the pair of glass plates 12 at an interval of 1 mm.

(Sample B)
As shown in FIG. 10A, the sample B is a laminate 16 produced in the same manner as the sample A except that the intermediate film layer 17 is changed to the intermediate film layer 17 in which the second discontinuous portion 18b is omitted. The resin film used for producing the sample B was obtained by making a cut from the outer peripheral edge to the central portion. In sample B, the resin film was arranged between the pair of glass plates 12 so that the distance between the end faces facing each other at the cut of the resin film was 1 mm.

(Sample C)
Sample C is the laminated body 19 shown in FIG. 11A, and the intermediate film layer 20 of the laminated body 19 has a discontinuous portion 21 extending in a range inside the outer peripheral edge. ing. The resin film used for producing the sample C was obtained by making a cut in the range inside the outer peripheral edge. In sample C, the resin film was arranged between the pair of glass plates 12 so that the distance between the end faces facing each other at the cut of the resin film was 1 mm.

(Sample D)
Sample D is the laminated body 19 shown in FIG. 11B, and has an intermediate film layer 20 in which one unbroken resin film is arranged between a pair of glass plates 12.

(Manufacturing of laminated glass)
Laminated glass was obtained by performing an intermediate resin forming step using the samples A and B of the laminated body. In the intermediate resin layer forming step, a degassing process of vacuuming between the pair of glass plates 12 and a process of thermocompression bonding the intermediate film layer 17 of the laminated body to the glass plates 12 by using an autoclave were performed.

Further, the samples C and D of the laminated body are also subjected to a degassing process of evacuating between the pair of glass plates 12 and a process of thermocompression bonding the intermediate film layer 20 of the laminated body to the glass plates 12 using an autoclave. I got a laminated glass.

As shown in Table 1, by performing the degassing treatment of the laminated bodies 16 and 19 of each sample under three kinds of pressure conditions for a certain period of time, the degassed state between the pair of glass plates 12 in the obtained laminated glass can be obtained. confirmed. The pressure conditions in Table 1 are as follows. If no residual air bubbles are confirmed under the pressure condition c below, the gas is unlikely to stay between the pair of glass plates 12.

Pressure condition a: Differential pressure -0.1 MPa
Pressure condition b: Differential pressure -0.05 MPa
Pressure condition c: Differential pressure −0.02 MPa
The differential pressure is the differential pressure between the atmospheric pressure and the pressure inside the bag containing the laminate. The pressure conditions a to c were set by adjusting the pressure inside the bag.

In Table 1, the residual state of bubbles in the obtained laminated glass was visually confirmed, and the sample in which no residual bubbles were confirmed was “○”, the sample in which small bubbles were confirmed was “△”, and the sample was large. Samples in which residual bubbles are confirmed are indicated by "x".

表１に示すように気泡の残存状態の結果から、サンプルＡ，Ｂの積層体では、圧力条件ｃのように、差圧を０に近づけても気泡の残存が確認されなかった。圧力条件ｃでも気泡が残存しないことは、気泡が残存し難いことを示す。なお、サンプルＤの積層体では、小さな気泡が残存し、サンプルＣの積層体では、不連続部２１が形成されていた付近に気泡が残存していた。これにより、サンプルＤの積層体は、気泡が残存し易く、サンプルＣの積層体の不連続部２１は、脱気経路として機能しないことが分かる。

As shown in Table 1, from the results of the residual state of bubbles, in the laminated body of Samples A and B, the residual bubbles were not confirmed even when the differential pressure was brought close to 0 as in the pressure condition c. The fact that no bubbles remain even under the pressure condition c indicates that the bubbles are unlikely to remain. In the laminated body of sample D, small bubbles remained, and in the laminated body of sample C, air bubbles remained in the vicinity where the discontinuous portion 21 was formed. From this, it can be seen that bubbles are likely to remain in the laminated body of sample D, and the discontinuous portion 21 of the laminated body of sample C does not function as a degassing path.

(Laminated glass heating test)
A fireproof glass window was obtained by attaching the laminated glass obtained from the above sample A (hereinafter, referred to as "laminated glass A") to the window frame. Next, a fireproof glass window was attached to the window frame of the test furnace formed of the heat insulating brick, and a heating test was conducted in which the laminated glass A of the fireproof glass window was heated by the test furnace. The width dimension of the laminated glass A used in the heating test is 600 mm, and the height dimension is 800 mm. In the heating test, the temperature inside the furnace at a position 10 cm away from the window frame of the test furnace was raised according to the temperature profile shown in FIG.

The state in which white smoke was generated from the laminated glass A being heated in the test furnace was visually observed from the outside of the test furnace. This white smoke is generated by burning the intermediate resin layer 13 of the laminated glass A. The time from the start of heating to the start of white smoke generation (hereinafter referred to as "start time") and the time from the start of heating to the end of white smoke generation (hereinafter referred to as "end time"). And measured. This heating test was repeated four times using four laminated glasses A, and the average value of the start time and the average value of the end time were calculated.

The laminated glass obtained from the sample D (hereinafter referred to as “laminated glass D”) was also subjected to a heating test under the same conditions as the laminated glass A, and the average value of the start time and the average value of the end time were calculated. .. The results are shown in Table 2.

表２に示されるように、合わせガラスＡの開始時間は、合わせガラスＤの開始時間よりも早い。この結果から、合わせガラスＡでは、合わせガラスＤと比較して、中間樹脂層１３から発生した気体が中間樹脂層１３の外周端縁へ排出され易いことが分かる。すなわち、合わせガラスＡでは、合わせガラスＤと比較して、中間樹脂層１３から発生した気体が一対のガラス板１２の間に滞留し難いことが分かる。

As shown in Table 2, the start time of the laminated glass A is earlier than the start time of the laminated glass D. From this result, it can be seen that in the laminated glass A, the gas generated from the intermediate resin layer 13 is more likely to be discharged to the outer peripheral edge of the intermediate resin layer 13 as compared with the laminated glass D. That is, it can be seen that in the laminated glass A, the gas generated from the intermediate resin layer 13 is less likely to stay between the pair of glass plates 12 as compared with the laminated glass D.

Further, as shown in Table 2, the end time of the laminated glass A is earlier than the end time of the laminated glass D. From this result, it can be seen that the gas generated from the intermediate resin layer 13 is less likely to stay between the pair of glass plates 12 in the laminated glass A than in the laminated glass D.

Next, the operation and effect of this embodiment will be described.
(1) The laminated glass 11 has a laminated structure having a pair of glass plates 12 and an intermediate resin layer 13 provided between the pair of glass plates 12. The intermediate resin layer 13 of the laminated glass 11 has an adhesive portion 14 formed by adhering to the glass plate 12, and a low adhesive portion 15 having a lower adhesive strength to the glass plate 12 than the adhesive portion 14. The low-adhesion portion 15 of the intermediate resin layer 13 extends from the outer peripheral edge of the intermediate resin layer 13 toward the inside of the intermediate resin layer 13 in a plan view.

According to this configuration, as described above, the gap between the low-adhesion portion 15 of the intermediate resin layer 13 and the glass plate 12 allows the gas between the intermediate resin layer 13 and the glass plate 12 to pass through the outer periphery of the intermediate resin layer 13. It is a discharge route that discharges to the edge. Thereby, the discharge of gas between the intermediate resin layer 13 and the glass plate 12 can be promoted. Therefore, in the event of a fire, it is possible to prevent the gas generated from the intermediate resin layer 13 from staying between the pair of glass plates 12.

(2) The low-adhesive portion 15 of the intermediate resin layer 13 in the laminated glass 11 is different from the first low-adhesive portion 15a extending from the first outer peripheral edge 13a of the intermediate resin layer 13 and the first outer peripheral edge 13a. It has a second low adhesive portion 15b extending from the second outer peripheral edge 13b at the position. In this case, since a plurality of discharge paths can be formed in the intermediate resin layer 13, the gas staying between the pair of glass plates 12 can be further suppressed. As a result, it is possible to further improve the fire protection performance of the laminated glass 11 by further suppressing unnecessary pressure applied to the glass plate 12.

(3) The first low-adhesive portion 15a and the second low-adhesive portion 15b of the laminated glass 11 are connected inside the intermediate resin layer 13 in a plan view. In this case, the discharge of gas between the intermediate resin layer 13 and the glass plate 12 can be further promoted by the discharge path connected between the first outer peripheral edge 13a and the second outer peripheral edge 13b of the intermediate resin layer 13. it can. As a result, it is possible to further improve the fire protection performance of the laminated glass 11 by further suppressing unnecessary pressure applied to the glass plate 12.

(4) The intermediate resin layer 13 of the laminated glass 11 has a resin base material layer L1 and an adhesive layer L2 provided on both main surfaces of the resin base material layer L1. The low adhesive portion 15 of the intermediate resin layer 13 has only the resin base material layer L1 of the resin base material layer L1 and the adhesive layer L2. In this case, the adhesive strength of the low adhesive portion 15 to the glass plate 12 can be easily reduced.

(5) By forming the resin base material layer L1 of the intermediate resin layer 13 from a fluororesin, it is possible to further improve the fire protection performance of the laminated glass 11.
(6) The method for manufacturing the laminated glass 11 is a laminated body that forms a laminated body 16 having a laminated structure of a pair of glass plates 12 and an intermediate film layer 17 in which a resin film F is arranged between the pair of glass plates 12. It has a forming process. The intermediate film layer 17 of the laminated body 16 has a discontinuous portion 18 in which the end faces of the resin film F face each other. The discontinuous portion 18 extends from the outer peripheral edge of the intermediate film layer 17 toward the inside of the intermediate film layer 17 in a plan view. The method for producing the laminated glass 11 includes an intermediate resin layer forming step of forming the intermediate resin layer 13 from the intermediate film layer 17 by heating the laminated body 16. In the intermediate resin layer forming step, the gas between the pair of glass plates 12 is discharged from the outer peripheral edge of the intermediate film layer 17 through the discontinuous portion 18, and the discontinuous portion 18 is welded to form the low adhesive portion 15. Is forming.

According to this method, the gas between the pair of glass plates 12 can be smoothly discharged as described above, so that the adhesion between the resin film F and the glass plates 12 can be improved in a shorter time, for example. It will be possible.

(7) The resin film F has a film base material layer L11 and a film adhesive layer L12 provided on both main surfaces of the film base material layer L11, so that the adhesive portion 14 of the intermediate resin layer 13 and the glass plate 12 are provided. Adhesion with can be improved. Here, since the resin film F having good adhesiveness to the glass plate 12 tends to have relatively high hydrophilicity, the resin film F may be discolored due to the influence of the environmental humidity in which the laminate forming step is performed. In the present embodiment, the film adhesive layer L12 of the resin film F has relatively high hydrophilicity. When moisture absorption progresses in the vicinity of the end face of the resin film F, white streaks may be easily visually recognized along the low adhesive portion 15 in the obtained laminated glass 11.

From the viewpoint of suppressing moisture absorption in the vicinity of the end face of the resin film F as described above, in the method for producing the laminated glass 11, it is preferable to perform the laminate forming step in an atmosphere having a relative humidity of 60% or less. In this case, by setting the relative humidity within the above range, it is possible to make the white streaks along the low adhesive portion 15 difficult to see. Therefore, the appearance quality of the laminated glass 11 can be improved.

(8) In the laminate forming step, the discontinuous portion 18 of the intermediate film layer 17 is formed by arranging the outer peripheral end faces of the first resin film F1 and the outer peripheral end faces of the second resin film F2 so as to face each other. doing. In this case, for example, the laminated glass 11 can be obtained by using a plurality of resin films having an area smaller than the area of the glass plate surface. Therefore, for example, it is possible to obtain a laminated glass 11 having a larger external dimension by using a resin film having existing dimensions.

(Change example)
This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

-The intermediate resin layer 13 of the laminated glass 11 has a resin base material layer L1 and an adhesive layer L2, but even if the adhesive layer L2 is omitted and the intermediate resin layer is formed only from the resin base material layer L1. Good.
The first low-adhesive portion 15a and the second low-adhesive portion 15b in the intermediate resin layer 13 of the laminated glass 11 may be separated from each other without being connected.

-As shown in FIG. 13, the low adhesive portion 15 may be formed only on one side of the intermediate resin layer 13.
The first low-adhesive portion 15a and the second low-adhesive portion 15b in the intermediate resin layer 13 of the laminated glass 11 are connected at the central portion of the intermediate resin layer 13 in a plan view, but on the outer peripheral side of the central portion. It may be connected.

As shown in FIG. 10B, the discontinuous portion 18 of the intermediate film layer 17 in the laminated body 16 is located at three or more different positions on the outer peripheral end portion of the intermediate film layer 17, for example, the first outer peripheral end. It can also be arranged so as to extend from the edge 17a, the second outer peripheral edge 17b, the third outer peripheral edge 17c, and the fourth outer peripheral edge 17d. The low-adhesion portion 15 of the laminated glass 11 is a discontinuity portion 18 of the intermediate film layer 17, that is, a first discontinuity portion 18a, a second discontinuity portion 18b, a third discontinuity portion 18c, and a fourth discontinuity portion. It is changed corresponding to 18d.

-The discontinuous portion 18 of the intermediate film layer 17 in the laminated body 16 may be arranged so as to extend in a plurality of directions from the same position on the outer peripheral end portion of the intermediate film layer 17.
The number of resin films constituting the intermediate film layer 17 of the laminated body 16 may be a single number as shown in FIG. 10A, or may be a plurality of resin films as shown in FIGS. 7 and 10B. It may be.

The shapes of the first low-adhesion portion 15a and the second low-adhesion portion 15b in the intermediate resin layer 13 of the laminated glass 11 may be linear or curved.
-The planar shape of the laminated glass 11 may be a polygonal shape other than a quadrangular shape, or may be a planar shape such as a circular shape or an elliptical shape, for example.

The laminated glass 11 is not limited to a three-layer structure consisting of a pair of glass plates 12 and an intermediate resin layer 13, and for example, a first glass plate, a first intermediate resin layer, a second glass plate, and a second glass plate. It may have a five-layer structure of an intermediate resin layer and a third glass plate. In this case, the laminated structure of the above embodiment may be applied to the first laminated structure of the first glass plate, the first intermediate resin layer, and the second glass plate in the five-layer structure. It may be applied to the second laminated structure of the second glass plate, the second intermediate resin layer, and the third glass plate. Further, the laminated structure of the above embodiment may be applied to any of the first laminated structure and the second laminated structure in the five-layer structure. The laminated glass 11 may have a structure of seven or more layers including an intermediate resin layer and a glass plate.

11 ... Laminated glass, 12 ... Glass plate, 13 ... Intermediate resin layer, 13a, 17a ... First outer peripheral edge, 13b, 17b ... Second outer peripheral edge, 14 ... Adhesive part, 15 ... Low adhesive part, 15a ... First 1 Low adhesive part, 15b ... Second low adhesive part, 16 ... Laminated body, 17 ... Intermediate film layer, 18 ... Discontinuous part, L1 ... Resin base material layer, L2 ... Adhesive layer, L11 ... Film base material layer, L12 ... film adhesive layer, F ... resin film, F1 ... first resin film, F2 ... second resin film.

Claims (9)

A laminated glass having a laminated structure of a pair of glass plates and an intermediate resin layer provided between the pair of glass plates.
The intermediate resin layer has an adhesive portion formed by adhering to the glass plate and a low adhesive portion having a lower adhesive strength to the glass plate than the adhesive portion.
The low-adhesion portion is a laminated glass extending from the outer peripheral edge of the intermediate resin layer toward the inside of the intermediate resin layer in a plan view. The low adhesive portion includes a first low adhesive portion extending from the first outer peripheral edge of the intermediate resin layer and a second low extending from a second outer peripheral edge at a position different from the first outer peripheral edge. The laminated glass according to claim 1, further comprising an adhesive portion. The laminated glass according to claim 2, wherein the first low-adhesion portion and the second low-adhesion portion are arranged so as to be connected inside the intermediate resin layer in a plan view. The intermediate resin layer has a resin base material layer and adhesive layers provided on both main surfaces of the resin base material layer.
The laminated glass according to any one of claims 1 to 3, wherein the low-adhesion portion has only the resin base material layer among the resin base material layer and the adhesive layer. The laminated glass according to claim 4, wherein the resin base material layer is made of a fluororesin. A method for producing a laminated glass having a laminated structure of a pair of glass plates and an intermediate resin layer provided between the pair of glass plates.
A laminate forming step of forming a laminate having a laminated structure of the pair of glass plates and an intermediate film layer in which a resin film is arranged between the pair of glass plates.
An intermediate resin layer forming step of adhering the intermediate film layer and the pair of glass plates to form the intermediate resin layer by heating the laminate is provided.
The intermediate film layer of the laminated body has a discontinuous portion in which the end faces of the resin film face each other, and the discontinuous portion is from the outer peripheral edge of the intermediate film layer to the inside of the intermediate film layer in a plan view. Prolonged towards
In the intermediate resin layer forming step, the gas between the pair of glass plates is discharged from the outer peripheral edge of the intermediate film layer through the discontinuous portion, and the discontinuous portion is welded to be more than the other portions. A method for producing a laminated glass, which forms a low-adhesive portion having a low adhesive strength to the glass plate. The method for producing a laminated glass according to claim 6, wherein the resin film has a film base material layer and a film adhesive layer provided on both main surfaces of the film base material layer. The method for producing a laminated glass according to claim 6 or 7, wherein the laminate forming step is performed in an atmosphere having a relative humidity of 60% or less. The resin film includes a first resin film and a second resin film.
Claim 6 to claim that the discontinuity is formed by arranging the outer peripheral end face of the first resin film and the outer peripheral end face of the second resin film so as to face each other in the laminate forming step. 8. The method for producing a laminated glass according to any one of 8.

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