JP2010265165A - Laminated glass and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated glass having an excellent crime prevention which is not easily destroyed and drilled by hitting, prying or burning breakage and to provide a method for manufacturing a laminated glass capable of shortening a manufacturing process and capable of reducing cost. <P>SOLUTION: In the laminated glass having an intermediate layer 4 between a pair of glass plates 5 and 5', the intermediate layer 4 has transparent resin layers 3 and 3' exhibiting tackiness by heating and melting on the surface of the both under layers 2 and 2' of a seat consisting of polyethylene terephthalate having under layers 2 and 2' on both surfaces, and the thickness of the intermediate layer 4 is less than 700 μm. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a laminated glass suitable for a window glass for buildings and the like, and a method for producing the laminated glass, which is inexpensive and lightweight, has a crime prevention performance excellent in penetration resistance and flame heat irradiation.

  In recent years, both the number of empty nests and damage are increasing (see Non-Patent Document 1). Under these circumstances, the National Police Agency and the Ministry of Land, Infrastructure, Transport and Tourism established “Precautions for Crime Prevention Related to Apartment Houses” on March 23, 2001. Among the basic matters, It is desirable to take measures to prevent intrusion such as the installation of a crescent with a lock and an auxiliary lock.

  External intruders for the purpose of criminal activities such as burial nests usually break the glass window provided as a daylighting part in the building, destroy the door, picking, etc. when locked in when entering the building The inside of the building is infiltrated by unlocking the key of the front door using the means described above.

  In addition, according to Non-Patent Document 1, intrusion into a detached house is often through a window. Further, intrusion from a window breaks a part of a window glass or opens a crescent provided in a sash. In order to prevent intrusion, it is preferable to use a glass that does not easily open a hole or break easily.

  Compared to raw glass that has been manufactured by the float process or roll-out method and has not been tempered, air-cooled tempering or chemical tempering such as partially replacing sodium in the glass after production The glass is cracked by adhering the tempered glass which is hard to break by generating compressive stress on the glass surface, or by bonding the two glasses with an intermediate film made of polyvinyl butyral (hereinafter sometimes abbreviated as “PVB”). Even if the laminated glass has few holes in the PVB as the intermediate film, the crime prevention performance is higher.

As a means of breaking glass windows and entering, it is called `` breaking '', it is used to destroy the glass window without worrying about the breaking sound with a bar or hammer, etc., and theft etc. before the surrounding people rush There is a means to achieve the above and a means called “pick break”, a means of breaking a glass window and making a hole so as not to make a loud sound with a screwdriver or the like, and a crescent lock or the like to enter secretly. Compared to the “breaking” with a loud sound of destruction, the “breaking” with a small breaking sound has more damage to the empty nest.
Note that the tempered glass veneer is broken by “breaking” unless it is very thick.

  With respect to the above-mentioned “breaking” and “pricking”, as a crime prevention glass that is hard to break and hardly open a hole, that is, with an emphasis on impact resistance and penetration resistance against physical impact, for example, (1) matching Laminated glass obtained by thickening PVB, which is an intermediate film of glass, so that holes are not easily opened. (2) Polycarbonate plate having high impact resistance on the intermediate layer of laminated glass (hereinafter, sometimes referred to as “PC”) And laminated glass bonded and integrated with an ethylene-vinyl acetate copolymer (hereinafter sometimes abbreviated as “EVA”), (3) a glass plate and polyethylene terephthalate (hereinafter abbreviated as “PET”). Laminated glass or the like obtained by bonding sheets with an adhesive that solidifies after bonding is commercially available.

  By the way, there is no crime prevention standard for buildings in Japan, but in Europe and the United States there are crime prevention standards for buildings such as stores, hotels, houses, offices, hospitals, etc. Especially in the United States, storefronts and hotels It is recommended to use laminated glass for crime prevention. For example, in Japan, a glass impact resistance test is standardized in ISO standard 16939-1, and as a result, plate glass is classified into security classes P1A to P5A.

However, even with laminated glass using the PVB 30 mil, which has the largest shipment volume, the manufacturing process and manufacturing time are long, so the cost is increased and the cost is relatively high. This is the situation.
One factor that has become a bottleneck in the spread of laminated glass is the price. In particular, there is a problem that the expense ratio of the laminated glass manufacturing process is high.

In addition, by using a high-heat type gas burner in which the flame temperature is increased by forcibly injecting flammable gas, or by squeezing the flame, when the glass is rolled, the part that has become hot locally melts, It expands and heat cracks occur.
Small high-heat type gas burners that are easy to carry using flammable gas such as butane gas are commercially available and are readily available. When the window glass is rolled using this gas burner, the glass in the heated part melts or heat cracks in a short time and a through hole is opened, and no sound is generated compared to `` breaking '', compared to `` breaking ''. It takes time and effort.

  Even if PVB, PC board, etc., which has a laminated glass structure and is “breaking” and “pricking”, are sandwiched in the middle layer, the conventional laminated glass for crime prevention is a case of being struck with a high-temperature gas burner Is not assumed, so when heated with a gas burner, the glass in the heated part breaks and the PVB and PC plate used for the intermediate layer melt, so that a through-hole that can be put into a hand is opened in a short time There was a problem.

On the other hand, the melting point of PET is 245 ° C., and the heat resistance temperature of PET is higher than that of PVB having a softening point of 80 ° C. and PC having a softening point of 135 ° C. Even if the laminated glass laminated by the method is rolled from the glass surface side with a gas burner, no hole is opened in a short time compared to the laminated glass sandwiching the PC plate and PVB.
However, the PET sheet has a problem that the adhesiveness with the transparent resin layer, particularly plasticized polyvinyl butyral, is not excellent.
In order to increase the durability of the laminated glass for crime prevention against "breaking", "breaking", and flame heat irradiation by a gas burner, increase the resin thickness of the glass and / or the intermediate layer, and 3 or more glass plates Although it is possible to use a laminated structure in which a resin layer such as PVB, PC plate, or PET sheet is sandwiched between laminated glass, these methods can be used by increasing the thickness and mass of the window glass. There is a problem that sashes and windows are limited, and it is difficult to use for ordinary houses. In addition, the destruction and penetration action by the flame heat irradiation by the gas burner may be referred to as “burn-out”.

In order to solve the above-mentioned problem, for example, Patent Document 1 has a cross-linked ethylene-vinyl acetate copolymer as an intermediate layer on both sides of a sheet made of polyethylene terephthalate between a pair of glass plates, and the thickness of the intermediate layer is A laminated glass having a thickness of 700 μm or more and 2000 μm or less has been proposed. This laminated glass is excellent in fracture penetrability by irradiation with flame-resistant heat having performance satisfying the crime prevention class “P4A” of CEN standard TC129.
However, Patent Document 1 is a high-grade high-grade laminated glass of crime prevention class “P4A”, and since the intermediate layer is thick, it is not possible to reduce the weight, and further, an adhesion process by an autoclave is necessary, and the manufacturing process is shortened. It is difficult to achieve cost reduction, and cost reduction cannot be achieved.

Japanese Patent No. 4076741

JUSRI Report, separate volume No. 8, Urban Security Research Center, published in March 1997

  This invention is made | formed in view of this present condition, and makes it a subject to solve the said various problems in the past and to achieve the following objectives. That is, the present invention provides a laminated glass excellent in crime prevention performance that is not easily broken or pierced by “breaking”, “punching”, and “baking”, and shortening the manufacturing process. An object of the present invention is to provide a method for producing laminated glass, which is possible and can reduce costs.

As a result of intensive studies by the present inventors in order to solve the above-mentioned problems, on the surfaces of both under layers of a sheet made of polyethylene terephthalate having an under layer on both sides for the purpose of enhancing the adhesion to the transparent resin layer. Laminated glass formed by inserting an intermediate layer provided with a transparent resin layer showing adhesiveness by heat melting between a pair of glass plates is easily broken by `` breaking '', `` breaking '', and `` burning '', It has been found that it has excellent crime prevention performance that does not open a hole.
In addition, by making the thickness of the intermediate layer less than 700 μm, it is possible to shorten the manufacturing process and reduce the cost by heating and melting the transparent resin layer without the need for an autoclave. It has been found that a laminated glass can be provided.

The present invention is based on the above findings by the present inventors, and means for solving the above problems are as follows. That is,
<1> A laminated glass having an intermediate layer between a pair of glass plates,
The intermediate layer has a transparent resin layer containing a transparent resin exhibiting adhesiveness by heat melting on both under layer surfaces of a sheet made of polyethylene terephthalate having an under layer on both sides,
The laminated glass is characterized in that the intermediate layer has a thickness of less than 700 μm.
<2> The laminated glass according to <1>, wherein the sheet made of polyethylene terephthalate has a thickness of 50 μm to 400 μm.
<3> Any one of <1> to <2>, wherein the transparent resin comprises at least one selected from plasticized polyvinyl butyral, ethylene-vinyl acetate copolymer, and cross-linked ethylene-vinyl acetate copolymer It is the laminated glass of crab.
<4> The laminated glass according to any one of <1> to <3>, wherein the under layer contains any one of an acrylic resin, a polyurethane resin, and a polyolefin resin.
<5> Any one of <1> to <4>, wherein at least one of the polyethylene terephthalate sheet, the under layer, and the transparent resin layer constituting the intermediate layer has at least one of an ultraviolet shielding function and an infrared shielding function It is the laminated glass of crab.
<6> On both under layer surfaces of a sheet made of polyethylene terephthalate having an under layer on both sides, an intermediate layer having a transparent resin layer containing a transparent resin exhibiting adhesiveness by heating and melting is sandwiched between a pair of glass plates, It is a method for producing a laminated glass, wherein the transparent resin layer is melted by heat treatment, and the intermediate layer and the glass plate are bonded and integrated.

  According to the present invention, various conventional problems can be solved, laminated glass excellent in crime prevention performance that is not easily broken or pierced by `` breaking, '' `` breaking, '' and `` burning, '' and The manufacturing process can be shortened, and a method for manufacturing laminated glass that can contribute to cost reduction can be provided.

FIG. 1 is a schematic cross-sectional view showing an example of the laminated glass of the present invention. FIG. 2 is a schematic view of a support frame used for an impact resistance test of a sheet glass standardized to ISO standard 16939-1. FIG. 3 is an explanatory view of a heated portion of the laminated glass.

(Laminated glass)
The laminated glass of this invention has an intermediate | middle layer between a pair of glass plates, and also has another layer as needed.

<Intermediate layer>
The said intermediate | middle layer has a transparent resin layer containing the transparent resin which shows adhesiveness by heat-melting on the surface of both under layer of the sheet | seat which consists of a polyethylene terephthalate which has an under layer on both surfaces.
The intermediate layer has a thickness of less than 700 μm, preferably 200 μm to 500 μm. If the thickness of the intermediate layer is 700 μm or more, the crime prevention property becomes a high grade of P3A or more, and the time required for the heat treatment increases, which may result in a high-grade product because the process such as no autoclave cannot be shortened.

-Sheet made of polyethylene terephthalate (PET sheet)-
The shape, structure, size and the like of the PET sheet are not particularly limited and can be appropriately selected according to the purpose. Examples of the shape include a flat plate shape, and the structure is as follows. May have a single layer structure or a laminated structure, and the size can be appropriately selected according to the size of the laminated glass.

  The PET is rigid because it has a benzene ring in its main chain in its chemical structure, and the transparent PET sheet produced by biaxial stretching is a tough material having impact strength as well as high tensile strength. Moreover, it is a crystalline plastic and has a high melting point. Even when heated and melted above the melting point, it exhibits viscosity and does not melt immediately. Further, by using a tough PET sheet and transparent resin layers on both sides thereof as an intermediate layer of laminated glass, superior resistance to tearing can be obtained compared to laminated glass using an intermediate layer of only soft PVB. That is, the time until the hole is opened due to the “pick break” becomes extremely long.

By printing a pattern such as a stripe pattern or a logo mark on the PET sheet, it is possible to impart decorativeness to the laminated glass of the present invention.
If necessary, an infrared absorber or an ultraviolet absorber can be added to the PET sheet in order to impart an infrared shielding function, an ultraviolet shielding function, or the like.
The PET sheet may be colored with a colorant such as a pigment, and the laminated glass of the present invention may be a transparent colored laminated glass. Those who produce colored laminated glass using colored PET sheets use colored glass in which the glass itself is colored with a metal oxide or colored coated glass in which a colored film such as a metal oxide is formed on the glass surface. Compared with manufacturing colored laminated glass, it is easier and the degree of freedom in selecting the color tone and visible light transmittance is great.

Since the PET sheet is produced by biaxial stretching, it is difficult to produce a thick sheet, and the thickness of a commercially available transparent PET sheet is usually 400 μm or less. Therefore, the thickness of the PET sheet is preferably 50 μm or more and 400 μm or less, and more preferably 188 μm to 400 μm.
In addition, also when using a some PET sheet, it is preferable that the total thickness of this some PET sheet is 50 micrometers or more and 400 micrometers or less.

-Under layer-
The under layer is provided for the purpose of improving the adhesion between the PET sheet and the transparent resin layer. In particular, when the plasticized polyvinyl butyral, which has been used for laminated glass most frequently but has a low adhesion to a conventional PET sheet, is used for the transparent resin layer, the under layer exhibits an effect.

The under layer contains a binder resin and, if necessary, other components.
The binder resin is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include polyester resin, polyamide resin, polyurethane resin, acrylic resin, epoxy resin, vinyl chloride resin, polyacetal resin, and polyolefin resin. It is done. These may be used individually by 1 type and may use 2 or more types together. Among these, heat melting with transparent resins (plasticized polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), and cross-linked ethylene-vinyl acetate copolymer (EVA)) used for laminated glass Acrylic resin, polyurethane resin, and polyolefin resin are particularly preferable in terms of adhesion (adhesion strength) after wearing.
Other components such as an infrared absorber, an ultraviolet absorber, a colorant, and a foaming inhibitor can be added to the under layer as necessary.

There is no restriction | limiting in particular as a formation method of the said under layer, It can form according to a well-known method, For example, it can form suitably by the apply | coating method using the under layer coating liquid formed by mix | blending the said component. .
Examples of the coating method include blade coating method, gravure coating method, gravure offset coating method, bar coating method, roll coating method, knife coating method, air knife coating method, comma coating method, U comma coating method, AKKU coating method, Examples thereof include a smoothing coating method, a micro gravure coating method, a reverse roll coating method, a four or five roll coating method, a dip coating method, a falling curtain coating method, a slide coating method, and a die coating method.
There is no restriction | limiting in particular in the thickness of the said under layer, According to the objective, it can select suitably, 0.1 micrometer-2.0 micrometers are preferable.

-Transparent resin layer-
The said transparent resin layer contains the transparent resin which shows adhesiveness by heat-melting, and also contains another component as needed.

  The transparent resin is not particularly limited as long as it is a transparent resin that exhibits adhesiveness by heating and melting, and can be appropriately selected according to the purpose. For example, plasticized polyvinyl butyral (PVB) and ethylene-vinyl acetate are used together. It is preferably at least one selected from a polymer (EVA) and a cross-linked ethylene-vinyl acetate copolymer (EVA).

  The PVB, EVA, and cross-linked EVA exhibit viscoelasticity due to entanglement of molecular chains even after adhesion, as compared with a general adhesive that solidifies after adhesion. Therefore, a laminated glass in which a transparent resin layer made of these transparent resins is sandwiched and integrated is difficult to open against “breaking” and “punching”, and exhibits excellent crime prevention performance.

  Since the crosslinked EVA is a three-dimensional copolymer, it has a particularly high melt viscosity at a high temperature. Even if the crosslinked EVA is melted at a high temperature by heating with a flame such as a gas burner, the glass is adhered to the PET sheet. Is particularly long compared to PVB and EVA. That is, when the same thickness of PVB, EVA, and cross-linked EVA are used, the laminated glass is made using cross-linked EVA, and a hole is opened when the laminated glass is rolled. The time is outstanding. Therefore, when it is desired to improve the fracture penetrability by flame heat irradiation, it is preferable to use crosslinked EVA for the transparent resin layer.

  On the other hand, since most of the commercially available laminated glasses are mainly provided with PVB in the intermediate layer, it is preferable to use plasticized PVB from the viewpoint of unifying the manufacturing process and reducing the cost of the laminated glass.

  If necessary, an infrared absorber and an ultraviolet absorber can be added to the transparent resin layer in order to impart an infrared blocking function, an ultraviolet blocking function, and the like. Furthermore, other components such as a colorant and a foaming inhibitor can be added as necessary.

There is no restriction | limiting in particular as a formation method of the said transparent resin layer, It can form according to a well-known method, for example, (1) The coating method using the transparent resin layer coating liquid formed by mix | blending the said component, (2 ) A method using a transparent resin sheet obtained by forming a transparent resin layer composition formed by blending the above components may be used.
The thickness of the transparent resin layer is preferably 10 μm to 150 μm, and more preferably 10 μm to 50 μm.

At least one of the PET sheet, the under layer, and the transparent resin layer constituting the intermediate layer of the laminated glass can be provided with an ultraviolet shielding function. By shielding ultraviolet rays, the PET sheet It is also possible to suppress light degradation of the light and intrusion of ultraviolet rays into the room.
The means for imparting the ultraviolet shielding function is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a method of adding an ultraviolet absorber to a PET sheet, an under layer, or a transparent resin layer. It is done. Examples of the ultraviolet absorber include benzotriazole-based, benzodithiol-based, coumarin-based, benzophenone-based, salicylic acid ester-based, cyanoacrylate-based ultraviolet absorbers; titanium oxide, zinc oxide, and the like. There is no restriction | limiting in particular in the kind and compounding quantity of the said ultraviolet absorber, According to the objective, it selects suitably.

An infrared shielding function can be imparted to at least one of the PET sheet, the under layer, and the transparent resin layer constituting the intermediate layer of the laminated glass. The greenhouse effect, which is a temperature raising action, can be suppressed. As a result, it is possible this may also contribute to the ecology of air conditioning, such as also the cooling load and expenses reduction and CO ₂ suppression.
The means for imparting the infrared shielding function is not particularly limited and may be appropriately selected depending on the purpose. For example, a metal oxide or metal having an infrared shielding function on a PET sheet, an under layer, or a transparent resin layer And the like. There is no restriction | limiting in particular as a metal oxide or metal which has the said infrared shielding function, According to the objective, it can select suitably. Examples thereof include doped indium oxide (ITO), antimony-doped tin oxide (ATO), aluminum-doped zinc oxide, a composite system of zinc oxide, silver and zinc oxide, and an infrared absorbing dye. These may be used individually by 1 type and may use 2 or more types together.

<Plate glass>
The glass plate is not particularly limited and may be appropriately selected depending on the purpose.For example, a transparent glass plate, a mold glass plate, a netted glass plate, a lined glass plate, a tempered glass plate, a heat ray reflective glass plate, A heat ray absorbing glass plate, a Low-E glass plate, other various glass plates, etc. are mentioned.

  Since the intermediate glass has excellent penetration resistance, the plate glass exhibits sufficient crime prevention performance even when a raw plate glass manufactured by a float process and not subjected to a tempering treatment such as a heat treatment is used. Furthermore, in order to improve the impact resistance, that is, to prevent cracking and to obtain excellent crime prevention performance, the raw glass is heated near the softening point and then air-cooled, or sodium near the surface of the raw glass is added. Tempered glass that is chemically tempered by replacement with potassium or the like, netted polished plate glass, or the like may be used.

The thickness of the glass plate is preferably 1.8 mm or more and 6 mm or less, for example, nominal thickness, 3 mm (common name, FL3), nominal thickness, 4 mm (common name, FL4), nominal thickness, 5 mm (common name, FL5). ), Nominal thickness, 6 mm (common name, FL6) and other float plate glass standard products manufactured by a float apparatus can be used. For FL3, FL4, FL5, and FL6, the tolerance for the nominal thickness is ± 0.3 mm in JIS R3202, for example, FL3 is in the range of 2.7 mm to 3.3 mm in thickness.
However, the crime prevention and disaster prevention glass and rib glass used for the atrium of the building are thicker than the glass for general use, and the laminated glass of the present invention can also be used for buildings. About the plate glass used for a laminated glass, it is not necessary to specify the thickness and kind of glass.
In addition, the laminated glass of this invention is good also as a structure which laminated | stacked 3 or more sheet glass.

<Other layers>
As the other layers, an ultraviolet blocking layer mainly having an ultraviolet blocking function and an infrared blocking layer mainly having an infrared blocking function can be provided.

<Conventional laminated glass for crime prevention>
As conventional laminated glass for crime prevention, laminated glass whose thickness is increased so that the polyvinyl butyral, which is an interlayer film, does not easily open a hole, or a PC board and EVA with high impact resistance are inserted into the intermediate layer of laminated glass. An integrated pair of plate glasses each having a thickness of 3 mm and a combination of the intermediate layer and the thickness of 6.8 mm are commercially available as standard products.
For example, laminated glass with a laminated structure of float glass 3.0 mm thickness (FL3) / PVB 760 μm thickness / float glass 3.0 mm thickness (FL3) satisfies the crime prevention class “P2A” of ISO standard 16939-1, It is often used as a security glass for windows of ordinary houses such as condominiums and atriums of buildings.

  The laminated glass of the present invention comprises two intermediate layers provided with a transparent resin layer exhibiting adhesiveness by heating and melting on both sides of a PET sheet provided with an under layer on both sides for the purpose of enhancing adhesion to the transparent resin layer. This is a case in which the glass and the intermediate layer are integrated into a laminated glass by sandwiching between glass sheets and then melting by heating, and is thinner than the conventional laminated glass for crime prevention. It can be made into a laminated glass for crime prevention which is strong against “breaking” and “burning-out”, is light, strong and inexpensive.

  The laminated glass of the present invention has an ISO sheet thickness of 50 μm or more and 400 μm or less, and the intermediate layer has a thickness of less than 700 μm. As a result of testing in accordance with the impact resistance test with a falling ball standardized by the standard, even if a steel ball having a diameter of 100 mm and a weight of 4.11 kg is dropped three times from a height of 3 m, the steel ball does not penetrate. It becomes possible to obtain laminated glass having a strength satisfying the crime prevention class “P1A” or “P2A” of ISO standard 16939-1.

  In the laminated glass of the present invention, an under layer having improved adhesion to the transparent resin layer is provided on both sides of a PET sheet having a high melting point, and an intermediate layer in which the transparent resin layer is laminated on both sides is sandwiched between a pair of glass plates. Because it has a structure, even if it is heated by a flame such as a gas burner and the glass is thermally cracked, it takes advantage of the high melting point PET sheet, and a flame such as a gas burner compared to the conventional laminated glass for crime prevention. It takes a long time to open a hole against heating by, and it is difficult to open a hole against `` breaking '' and `` breaking '', and also has crime prevention performance with excellent destruction penetration due to flame heat irradiation It is.

(Laminated glass manufacturing method)
The method for producing a laminated glass of the present invention comprises an intermediate layer having a transparent resin layer containing a transparent resin exhibiting adhesiveness by heating and melting on both under layer surfaces of a sheet made of polyethylene terephthalate having an under layer on both sides. The transparent resin layer is melted by being sandwiched between a pair of glass plates and subjected to heat treatment, and the intermediate layer and the glass plate are bonded and integrated.
The heating temperature of the transparent resin layer is preferably 120 ° C to 150 ° C.

Specifically, as the method for producing the laminated glass, (1) a transparent resin layer is formed by using a radiant heating means such as an electric heater installed in the production apparatus while degassing the inside of the laminated glass production apparatus. (2) a heat roll method using a nip pressure, a nip position, and a heating temperature by softening and melting a sheet serving as an intermediate layer and integrating with a pair of plate glasses. Incorporation, a method of heat roll while degassing the inside of the laminated glass manufacturing apparatus, and the like.
In all the above manufacturing methods, the laminated glass of the present invention shortens the amount of heat and time required for heating and melting because the transparent resin layer is thinner than the intermediate layer of conventional PVB, EVA and crosslinked EVA. There is an advantage that the manufacturing process can be shortened by various methods such as no autoclave is required. As a result, an inexpensive laminated glass can be efficiently manufactured, and it can contribute to the spread of a safe laminated glass for crime prevention.

  The intermediate layer of the laminated glass is provided by coating by coating an under layer with high adhesion to the transparent resin layer on both sides of a PET sheet having a high melting point, and coating or coating by melt lamination on the both sides of the transparent resin layer. Thus, it can be kept in close contact before the laminated glass manufacturing process. As a result, with respect to the structure in which a transparent resin layer is laminated on both sides of a PET sheet and sandwiched between a pair of glass plates as an intermediate layer, the intermediate layer of the laminated glass has a transparent resin layer coated on the PET sheet in advance. As a result, there is no two layers of air between the transparent resin layer and the PET sheet interface, making it easier to degas in the production of laminated glass, and shortening and simplifying various manufacturing processes and manufacturing equipment by eliminating the need for autoclaves. As a result, it can contribute to the cost reduction of the laminated glass itself.

  Here, FIG. 1 is a cross-sectional view of an example of the laminated glass of the present invention. As shown in FIG. 1, the laminated glass is made of sheet glass 5, 5 ′ facing the intermediate layer 4 provided with transparent resin layers 3, 3 ′ on both sides of the PET sheet 1 having the under layers 2, 2 ′ on both sides. Then, the transparent resin layer is directly bonded to the glass plate by heat treatment, and the PET sheet 1, the under layers 2, 2 ', the transparent resin layers 3, 3', and the plate glasses 5, 5 ' It has an integrated structure.

  The intermediate layer 4 preferably has a thickness of 188 μm or more from the balance of excellent crime prevention against “breaking”, “breaking”, and “baking” and shortening of the manufacturing process. The thickness of the intermediate layer including the under layers 2 and 2 ′ and the transparent resin layers 3 and 3 ′ is less than 700 μm.

  The thickness of the plate glass 3, 3 ′ is preferably 1.8 mm or more and 6 mm or less. For example, a nominal thickness of 3 mm (commonly referred to as FL3), which is used for laminated glass using only general PVB as an interlayer film, A standard float plate glass manufactured by a float apparatus having a nominal thickness of 4 mm (common name, FL4), a nominal thickness, 5 mm (common name, FL5), a nominal thickness, 6 mm (common name, FL6), or the like can be used. For FL3, FL4, FL5, and FL6, the tolerance for the nominal thickness is ± 0.3 mm in JIS R3202, for example, FL3 is in the range of 2.7 mm to 3.3 mm in thickness.

  In the laminated glass of the present invention, when the intermediate layer 4 is the PET sheet 1, the under layers 2 and 2 ′ on both sides thereof, and the transparent resin layers 3 and 3 ′, the tough PET sheet 1 and the transparent resin layer excellent in viscoelasticity Compared with the conventional laminated glass which made the intermediate | middle layer only PVB by 3,3 ', the intensity | strength more than equivalent can be obtained with the laminated glass by an intermediate | middle layer thinner than before. As a result, it is easy to handle because of its lightweight laminated glass, and glass made by the float method with a nominal thickness of 2 mm (common name, FL2) or a nominal thickness of 2.5 mm (common name, FL2.5) that has not been tempered. Even if a plate is used, a laminated glass having a sufficient strength while being lightweight and having excellent breakage penetration due to breakage resistance, breakage resistance, and bake resistance can be obtained.

In addition to crime prevention performance, in order to reflect infrared rays and provide a heat insulating effect and a heat shielding effect, at least one surface of the glass plates 5, 5 ′ used in the laminated glass of the present invention, preferably one surface on the intermediate layer side Alternatively, a thin film made of Ag, SnO ₂ , ITO, TiO ₂ or the like may be formed. Moreover, you may give an infrared shielding function to intermediate | middle layer itself.

The laminated glass of the present invention can be applied to a sash for laminated glass having a general groove width of 9 mm and 11 mm.
Moreover, in order to provide crime prevention performance to the multilayer glass formed by sealing the peripheral edge with a pair of glasses being separated from each other, the laminated glass excellent in fracture penetration resistance according to the present invention is used on the outdoor side or the indoor side. It can be used as glass. In order to obtain the crime prevention performance for the multilayer glass, it is preferable to use the laminated glass of the present invention. In the multilayer glass where the sash itself becomes heavy, the laminated glass using the float plate glass of FL2, FL2.5 is duplicated. Since it is lightweight, it is easy to handle such as transportation, and to provide a favorable result such as easy opening and closing of the sash after installation in a house.

-Use-
Since the laminated glass of the present invention has an excellent anti-crime function, for example, building materials such as general detached houses, apartment houses, office bis, stores, public facilities, factory facilities, etc., partitions, etc. Glass for automobiles: Can be widely used for window glass for various vehicles such as automobiles, buses, trucks, trains, bullet trains, airplanes, passenger planes, and ships.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

<Steel ball drop test>
-Impact resistance test of sheet glass standardized to ISO standard 16939-1-
First, the impact resistance test of sheet glass standardized by ISO standard 16939-1 will be described in order.
FIG. 2 is a schematic view of a support frame used for an impact resistance test of a sheet glass standardized to ISO standard 16939-1.
1. Specimen s
-Size of test body s: 1100 mm x 900 mm (dimensional error: ± 5 mm)
-Storage conditions: Store at 23 ± 2 ° C for a minimum of 12 hours before the test.
2. Test equipment • Impactor: Steel ball (diameter 100 mm ± 0.2 mm, weight 4.11 kg, 60 HRC to 65 HRC)
Support frame: shown in FIG.
3. Test method (1) The test body s is fixed.
As shown in FIG. 2, the test body s is placed on a steel receiving box a, and the outer peripheral 30 mm ± 5 mm portion of the test body s is 140 kN / m ² ± 20 kN / m ² using the steel support frame b. Tighten with. In addition, rubber (40 IHRD to 60 IHRD) having a thickness of 4 mm is installed at a contact portion between the test body s and the support frame b. In order to protect the bottom surface of the receiving box a, a shock absorbing material d is placed on the bottom surface of the receiving box a, and a vent hole e for venting air at the time of impact is provided on the side surface.
(2) A steel ball is set to a predetermined height.
A steel ball (not shown) is raised to a predetermined drop height according to the security class to be tested. The test conditions for each crime prevention class are as shown in Table 1.

(3) Dropping the steel ball-Dropping position: as shown in FIG. 2, the top of an equilateral triangle with a side of 13 cm ± 2 cm centered on the center of the test body s, that is, the impact dropping position c of the steel ball Drop the steel ball on Note that one side of the equilateral triangle is parallel to one side of the test body s.
Drop order: The drop impact position c ′ at which the steel ball is dropped first is a vertex c ′ on the opposite side of the side parallel to one side of the test body s, and the order of the other two vertices is not particularly determined.
In the P1A to P4A classes, the steel balls are dropped once in three places (three times in total), and in the P5A class, the steel balls are dropped freely three times in three places (total nine times).
(4) Judgment conditions The case where all the three test bodies s that have been tested satisfy both of the following conditions 1 and 2 is regarded as acceptable.
Condition 1: The steel ball dropped on the specimen does not penetrate the specimen s.
Condition 2: The specimen s after the test is not displaced by 5 mm or more from the installation position before the test.
(5) Evaluation criteria ○: P2A or more Δ: P1A or more and less than P2A ×: Less than P1A

  In addition, the laminated glass which provided the PVB intermediate | middle layer of 30 mil (= 760 micrometers) between FL3 which is the structure of the commercially available laminated glass for crime prevention is P2A class of ISO standard 16939-1, and between FL3 The laminated glass provided with a PVB intermediate layer having a thickness of 60 mil (= 1520 μm) is a P4A class of ISO standard 16939-1, and the laminated glass provided with a PVB intermediate layer having a thickness of 90 mil (= 2280 μm) between FL3 is ISO This is the P5A class of standard 16939-1.

<Peeling resistance test>
In the test for resistance to tearing, each test piece of 300 mm × 300 mm size was inserted into a sash having a glass groove width of 9 mm by using a vinyl chloride glazing channel. Using a screwdriver, the test specimen was smashed and the time required to open a hole capable of unlocking a crescent of about 10 cm was measured to evaluate the puncture resistance. In this evaluation test, the tester performs “pick break” work, so that the same person does not have to be affected by the difference in the physical strength of the tester and the difference in the way of pry break work. went.
〔Evaluation criteria〕
○: Time required for opening a hole that can be unlocked is 60 seconds or more. ×: Time required for opening a hole that can be unlocked is less than 60 seconds.

<Baking test>
The burn-out test is performed while the tester moves the flame heat irradiation position on the specimen using the burner, i.e., the position where the flame hits. The test was performed three times for each specimen.
As shown in FIG. 3, for each test piece of 300 mm × 300 mm size as described above, after fixing one end portion 6 of the test piece to the jig, arc-shaped heating 100 mm away from the corner of the test piece. Using a commercially available high-temperature gas burner (Model No. GB-2001) for the part 7, the tester separates the burner port about 5 cm from the glass surface so that the flame directly heats the glass surface. While moving the position where the flame hits to the maximum, the glass of the heating part breaks, lightly pushes with the tip of the driver, measures the time required for the glass to drop, and compares the penetration to breakage due to flame heat irradiation evaluated. The flame temperature of the gas burner (manufactured by Prince, model number GB-2001) is 800 to 1,300 ° C. in the specification, and the flame temperature was estimated to be 1,300 ° C. because the heating power was maximized during the test. The
〔Evaluation criteria〕
○: The time required for the glass to drop off is 160 seconds or more. X: The time required for the glass to drop off is less than 160 seconds.

<Measurement of laminated glass completion time>
The laminated glass completion time was compared by the heat melting time of the transparent resin layer (intermediate layer in Comparative Examples 3 to 6).
First, in a method of heating and melting a transparent resin layer using radiant heating means such as an electric heater installed in the manufacturing apparatus while degassing the manufacturing apparatus, the pair of glasses sandwiching the intermediate layer is FL2, and the glass In each test body in which the size of the intermediate layer is fixed to 30 mm × 75 mm, the temperature of the electric heater is maintained at 150 ° C., the transparent resin layer of each test body is melt-bonded, and air escape and the transparent resin layer (or The time until the transparency of the intermediate layer) by heat melting was completed (laminated glass completion time) was measured three times, and the degree of shortening of the laminated glass manufacturing process was quantitatively evaluated by the average time.
〔Evaluation criteria〕
○: Laminated glass completion time is less than 150 seconds ×: Laminated glass completion time is 150 seconds or more

<Light resistance test>
In the light resistance test, a super UV test (metal halide lamp, manufactured by Iwasaki Electric Co., Ltd.) was used, the back plate temperature was set to 63 ° C., and each sample was set so that the glass surface was perpendicular to UV irradiation from above. After each test specimen is exposed and exposed for 500 hours, if there is a PET sheet in the laminated glass before and after the exposure, the amount of floating and air bubbles that can be seen between the PET sheet and the transparent resin layer evaluated.

(Production Example 1)
<Preparation of PET sheet A with double-sided underlayer comprising an underlayer having an acrylic resin and a polyurethane resin>
A PET sheet with a double-sided under layer was formed by the following procedure.
First, a polyethylene terephthalate (hereinafter referred to as PET) resin having an inherent viscosity of 0.66 polycondensed using Ge as a catalyst is dried to a moisture content of 50 ppm or less and melted in an extruder at a heater temperature of 280 ° C. to 300 ° C. It was. The melted PET resin was discharged from a die part onto a chill roll electrostatically applied to obtain an amorphous base. The obtained amorphous base was stretched 3.3 times in the base traveling direction and then stretched 3.8 times in the width direction, and three types of polyethylene terephthalate supports having thicknesses of 188 μm, 250 μm and 300 μm were obtained. Obtained.

After each of the three types of polyethylene terephthalate supports of thickness 188 μm, 250 μm and 300 μm formed as described above was transported at a transport speed of 105 m / min and subjected to corona discharge treatment under the condition of 730 J / m ² , The coating amount was 147.0 mg / m ² and the following [First layer coating solution (1)] was applied by the bar coating method. And after drying this at 180 degreeC for 1 minute and forming a 1st layer, the following [2nd layer coating liquid (1)] was continuously made into the coating amount on the 1st layer as 96.3 mg / m < ² >. After applying by the bar coating method, the under layer in which the first layer and the second layer were laminated on one side of polyethylene terephthalate as a support was produced by drying at 170 ° C. for 1 minute.
Thereafter, the same corona discharge treatment as described above and the subsequent application and drying of the first layer coating liquid (1) as described above are applied to each back surface, and the subsequent second layer coating liquid (1) as described above is applied. And it dried and produced PET sheet A with an under layer of manufacture example 1 by which the 1st layer and the 2nd layer were laminated on both sides of polyethylene terephthalate of a support.

[First layer coating solution (1)]
Polyester binder (manufactured by Kyoyo Chemical Co., Ltd., plus coat Z687, solid content 25% by mass) ... 45.1 parts by mass (coating amount: 80 mg / m ² , ratio to 100 parts by mass of polyester binder: 100 parts by mass)
Carbodiimide compound (manufactured by Nisshinbo Co., Ltd., Carbodilite V-02-L2, solid content 40% by mass) ... 15.8 parts by mass (coating amount: 45 mg / m ² , ratio to 100 parts by mass of polyester binder: 56. (3 parts by mass)
Oxazoline compound (Nippon Shokubai Co., Ltd., Epocros K2020E, solid content 40% by mass) ... 7.0 parts by mass (coating amount: 20 mg / m ² , ratio to 100 parts by mass of polyester binder: 25 parts by mass)
Surfactant A (manufactured by Sanyo Chemical Industries, Ltd., 1% by weight aqueous solution of NAROACTY CL-95) 15.5 parts by mass (coating amount: 1.1 mg / m ² , ratio to 100 parts by mass of polyester binder) : 1.4 parts by mass)
Surfactant B (manufactured by NOF Corporation, 1% by mass aqueous solution of Lapisol B-90) 12.7 parts by mass (coating amount: 0.9 mg / m ² , ratio to 100 parts by mass of polyester binder: 1 .1 part by mass)
・ Distilled water: added so that the whole becomes 1,000 parts by mass

[Second layer coating solution (1)]
・ Polyurethane binder (Mitsui Chemicals Co., Ltd., Olester UD-350, solid content 38% by mass) 22.8 parts by mass (coating amount: 61.5 mg / m ² )
Acrylic binder (manufactured by Daicel Chemical Industries, Ltd., EM48D, solid content: 27.5% by mass) ... 2.6 parts by mass (application amount: 5 mg / m ² )
Carbodiimide compound (Nisshinbo Co., Ltd., Carbodilite V-02-L2, solid content 40% by mass) ... 4.7 parts by mass (coating amount: 13.35 mg / m ² )
Surfactant A (manufactured by Sanyo Chemical Industries, Ltd., 1% by weight aqueous solution of NAROACTY CL-95) ... 15.5 parts by mass (amount applied: 1.1 mg / m ² )
Surfactant B (Nippon Yushi Co., Ltd., 1 mass% aqueous solution of Lapisol B-90) 12.7 parts by mass (coating amount: 0.9 mg / m ² )
Matting agent A (Nissan Chemical Industry Co., Ltd., Snowtex XL, solid content 40.5% by mass) ... 3.5 parts by mass (coating amount: 10 mg / m ² )
Matting agent B (manufactured by Nippon Aerosil Co., Ltd., Aerosil OX-50 aqueous dispersion, solid content 10% by mass) ... 1.6 parts by mass (application amount: 1.1 mg / m ² )
・ Sliding agent (manufactured by Chukyo Yushi Co., Ltd., carbana wax dispersion cellosol 524, solid content 30% by mass) ... 1.6 parts by mass (amount applied: 3.3 mg / m ² )
・ Distilled water: added so that the whole becomes 1,000 parts by mass

(Production Example 2)
<Preparation of PET sheet B with a double-sided underlayer comprising an underlayer having a polyolefin resin>
A PET sheet with a double-sided under layer was formed by the following procedure.
First, a polyethylene terephthalate (hereinafter referred to as PET) resin having an intrinsic viscosity of 0.66 polycondensed using Ge as a catalyst was dried to a moisture content of 50 ppm or less and melted in an extruder having a heater temperature of 280 to 300 ° C. . The melted PET resin was discharged from a die part onto a chill roll electrostatically applied to obtain an amorphous base. The obtained amorphous base was stretched 3.3 times in the base traveling direction and then stretched 3.8 times in the width direction, and three types of polyethylene terephthalate supports having thicknesses of 188 μm, 250 μm and 300 μm were obtained. Obtained.

A support of polyethylene terephthalate having a thickness of 188 μm, 250 μm, and 300 μm formed as described above, each side being transported at a transport speed of 105 m / min, subjected to a corona discharge treatment under the condition of 730 J / m ² , and then coated thereon The following [First layer coating solution (2)] was applied by a bar coating method with an amount of 276.8 mg / m ² . And after drying this at 180 degreeC for 1 minute (s) and forming a 1st layer, the following [2nd layer coating liquid (2)] was continuously made into 66.0 mg / m < ² > on the 1st layer. After applying by the bar coat method, the underlayer in which the first layer and the second layer were laminated on one side of the polyethylene terephthalate of the support was completed by drying at 170 ° C. for 1 minute.
Thereafter, the same corona discharge treatment as described above and the subsequent application and drying of the first layer coating liquid (2) as described above are applied to each back surface, and the subsequent second layer coating liquid (2) as described above is applied. And it dried and produced PET sheet B with the under layer of manufacture example 2 by which the 1st layer and the 2nd layer were laminated on both sides of polyethylene terephthalate of a support.

[First layer coating solution (2)]
Polyolefin binder (Mitsui Chemicals, Chemipearl S75N, solid content: 24% by mass) ... 23.9 parts by mass (coating amount: 40.7 mg / m ² )
・ Oxazoline compound (Nippon Shokubai Co., Ltd., Epocros WS700, solid content 25% by mass)... 7.1 parts by mass (application amount: 12.7 mg / m ² )
Surfactant A (manufactured by Sanyo Chemical Industries, Ltd., 1% by weight aqueous solution of NAROACTY CL-95) 62.0 parts by mass (amount applied: 4.4 mg / m ² )
・ Metal oxide (Mitsubishi Materials Co., Ltd., TDL-1, solid content 17% by mass) ... 181.4 parts by mass (application amount: 219 mg / m ² )
・ Distilled water: added so that the whole becomes 1,000 parts by mass

[Second layer coating solution (2)]
Polyolefin binder (Mitsui Chemicals, Chemipearl S75N, solid content 24% by mass) 26.2 parts by mass (amount applied: 44.7 mg / m ² )
Epoxy compound (manufactured by Nagase Kasei Co., Ltd., 1% by weight aqueous solution of Denacol EX-614B) ... 221.8 parts by mass (coating amount: 15.8 mg / m ² )
Surfactant A (manufactured by Sanyo Chemical Industries, Ltd., 1% by weight aqueous solution of NAROACTY CL-95) 77.2 parts by mass (amount applied: 5.5 mg / m ² )
・ Distilled water: added so that the whole becomes 1,000 parts by mass

Next, examples of laminated glass will be described.
Examples 1 to 20 of laminated glass using the PET sheet A with an under layer of Production Example 1 and Examples 21 to 40 of laminated glass using the PET sheet B with an under layer of Production Example 2 are shown.

Example 1
As shown in FIG. 1, float glass FL3 (manufactured by Nippon Sheet Glass Co., Ltd.) not subjected to a tempering treatment such as a heat treatment having a thickness of 3.0 mm was cut to a size necessary for each evaluation, and the end face was chamfered. PET sheet A with an under layer of Production Example 1 having a thickness of 188 μm, comprising an under layer 2 and 2 ′ having a thickness of 0.156 μm having acrylic resin and polyurethane resin on both surfaces between two glass plates 5 and 5 ′ ( An intermediate layer 4 provided with a transparent resin layer 3 or 3 ′ having a thickness of 50 μm is applied on both sides of a PET sheet with a double-sided adhesive layer (manufactured by Fuji Film Co., Ltd.) 1 and a plasticized polyvinyl butyral solution is applied and dried. After sandwiching, using a vacuum laminator (Nisshinbo Co., Ltd.) and heating and melting at 150 ° C. under vacuum, pressing is performed while maintaining the vacuum and temperature, as shown in FIG. Do combined to produce a glass.
In the case of a size of 300 mm × 300 mm, the glass was heated and melted at 150 ° C. for 20 minutes under vacuum, and then pressed while maintaining the vacuum and temperature to produce a laminated glass.

(Example 2)
In Example 1, laminated glass was obtained in the same manner as in Example 1 except that a plasticized polyvinyl butyral sheet having a thickness of 50 μm previously formed was used as the transparent resin layers 3 and 3 ′ in the intermediate layer. Was made.

(Example 3)
In Example 2, a laminated glass was prepared in the same manner as in Example 2 except that a cross-linked ethylene-vinyl acetate copolymer sheet having a thickness of 50 μm was used as the transparent resin layers 3 and 3 ′ in the intermediate layer. . When an ethylene-vinyl acetate copolymer and a cross-linked ethylene-vinyl acetate copolymer are used, after being melted by heating at 110 ° C. under vacuum, pressing is performed while maintaining the vacuum and temperature, as shown in FIG. Laminated glass was produced, and then re-heated at 150 ° C. to complete crosslinking and adhesion, thereby producing laminated glass.
In the case of a size of 300 mm × 300 mm, after being heated and melted at 110 ° C. for 20 minutes under vacuum, pressing is performed while maintaining the vacuum and temperature to produce a laminated glass, and then the glass is reused at 150 ° C. for 10 minutes. By heating, cross-linking and adhesion were completed, and a laminated glass was produced.

Example 4
In Example 2, a laminated glass was produced in the same manner as in Example 2 except that an ethylene-vinyl acetate copolymer sheet having a thickness of 50 μm was used as the transparent resin layers 3 and 3 ′ in the intermediate layer.

(Example 5)
In Example 3, a laminated glass was produced in the same manner as in Example 3 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 100 μm. The transparent resin was laminated on the PET sheet by a hot melt extrusion laminating method.

(Example 6)
In Example 3, a laminated glass was produced in the same manner as in Example 3 except that the thickness of the transparent resin layers 3 and 3 ′ in the intermediate layer was 150 μm.

(Example 7)
In Example 5, a laminated glass was produced in the same manner as in Example 5, except that an ethylene-vinyl acetate copolymer was used as the transparent resin layer 3 or 3 'in the intermediate layer.

(Example 8)
In Example 7, a laminated glass was produced in the same manner as in Example 7 except that the thickness of the transparent resin layers 3 and 3 ′ in the intermediate layer was 150 μm.

Example 9
In Example 3, PET sheet A with an under layer of Production Example 1 having a thickness of 0.156 μm and an underlayer 2, 2 ′ having an acrylic resin and a polyurethane resin on both sides (PET sheet with both surfaces of easy adhesion layers) Laminated glass was produced in the same manner as in Example 3 except that 1 (manufactured by FUJIFILM Corporation) was used. The transparent resin was laminated on the PET sheet by a hot melt extrusion laminating method.

(Example 10)
In Example 9, a laminated glass was produced in the same manner as in Example 3 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 100 μm.

(Example 11)
In Example 9, a laminated glass was produced in the same manner as in Example 3 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 150 μm.

(Example 12)
In Example 9, a laminated glass was produced in the same manner as in Example 3 except that an ethylene-vinyl acetate copolymer was used as the transparent resin layer 3 or 3 'in the intermediate layer.

(Example 13)
In Example 12, a laminated glass was produced in the same manner as in Example 12 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 100 μm.

(Example 14)
In Example 12, a laminated glass was produced in the same manner as in Example 12 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 150 μm.

(Example 15)
In Example 3, PET sheet A with an under layer of Production Example 1 having a thickness of 0.156 μm and having an underlayer 2, 2 ′ having an acrylic resin and a polyurethane resin on both sides (PET sheet with an easy-adhesion layer on both sides) Laminated glass was produced in the same manner as in Example 3 except that 1 (manufactured by FUJIFILM Corporation) was used. The transparent resin was laminated on the PET sheet by a hot melt extrusion laminating method.

(Example 16)
In Example 15, a laminated glass was produced in the same manner as in Example 15 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 100 μm.

(Example 17)
In Example 15, a laminated glass was produced in the same manner as Example 15 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 150 μm.

(Example 18)
In Example 15, a laminated glass was produced in the same manner as in Example 15 except that an ethylene-vinyl acetate copolymer was used as the transparent resin layer 3 or 3 'in the intermediate layer.

(Example 19)
In Example 18, a laminated glass was produced in the same manner as in Example 18 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 100 μm.

(Example 20)
In Example 18, a laminated glass was produced in the same manner as in Example 18 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 150 μm.

(Example 21)
As shown in FIG. 1, float glass FL3 (manufactured by Nippon Sheet Glass Co., Ltd.) not subjected to a tempering treatment such as a heat treatment having a thickness of 3.0 mm was cut to a size necessary for each evaluation, and the end face was chamfered. PET sheet B with an under layer of Production Example 2 having a thickness of 188 μm, comprising an under layer 2 and 2 ′ having a thickness of 0.163 μm having a polyolefin resin on both sides between two plate glasses 5 and 5 ′ (an easy adhesion layer) A double-sided PET sheet (manufactured by FUJIFILM Corporation) is coated on both sides of a plasticized polyvinyl butyral solution, dried and sandwiched with an intermediate layer 4 provided with transparent resin layers 3 and 3 ′ having a thickness of 50 μm, and vacuum Using a laminator (manufactured by Nisshinbo Co., Ltd.), heat and melt at 150 ° C. under vacuum, and press while maintaining the vacuum and temperature, so that the laminated glass as shown in FIG. It was produced.
In the case of a size of 300 mm × 300 mm, the glass was heated and melted at 150 ° C. for 20 minutes under vacuum, and then pressed while maintaining the vacuum and temperature to produce a laminated glass.

(Example 22)
In Example 21, laminated glass was used in the same manner as in Example 1 except that a plasticized polyvinyl butyral sheet having a thickness of 50 μm previously formed was used as the transparent resin layers 3 and 3 ′ in the intermediate layer. Was made.

(Example 23)
In Example 22, a laminated glass was produced in the same manner as in Example 2 except that a cross-linked ethylene-vinyl acetate copolymer sheet having a thickness of 50 μm was used as the transparent resin layers 3 and 3 ′ in the intermediate layer. . When an ethylene-vinyl acetate copolymer and a cross-linked ethylene-vinyl acetate copolymer are used, after being melted by heating at 110 ° C. under vacuum, pressing is performed while maintaining the vacuum and temperature, as shown in FIG. Laminated glass was produced, and then re-heated at 150 ° C. to complete crosslinking and adhesion, thereby producing laminated glass.
In the case of a size of 300 mm × 300 mm, after being heated and melted at 110 ° C. for 20 minutes under vacuum, pressing is performed while maintaining the vacuum and temperature to produce a laminated glass, and then the glass is reused at 150 ° C. for 10 minutes. By heating, cross-linking and adhesion were completed, and a laminated glass was produced.

(Example 24)
In Example 22, a laminated glass was produced in the same manner as in Example 22 except that an ethylene-vinyl acetate copolymer sheet having a thickness of 50 μm was used as the transparent resin layers 3 and 3 ′ in the intermediate layer.

(Example 25)
In Example 23, laminated glass was produced in the same manner as in Example 23, except that the thickness of the transparent resin layers 3 and 3 ′ in the intermediate layer was 100 μm. The transparent resin was laminated on the PET sheet by a hot melt extrusion laminating method.

(Example 26)
In Example 23, a laminated glass was produced in the same manner as in Example 23 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 150 μm.

(Example 27)
In Example 25, a laminated glass was produced in the same manner as in Example 25 except that an ethylene-vinyl acetate copolymer was used as the transparent resin layer 3 or 3 'in the intermediate layer.

(Example 28)
In Example 27, a laminated glass was produced in the same manner as in Example 27, except that the thickness of the transparent resin layers 3 and 3 ′ in the intermediate layer was 150 μm.

(Example 29)
In Example 23, PET sheet B with an under layer of Production Example 2 having a thickness of 0.163 μm and an underlayer 2, 2 ′ having an olefin resin on both surfaces (PET sheet with both surfaces of an easy-adhesion layer, Fuji Film) A laminated glass was produced in the same manner as in Example 23 except that 1 was used. The transparent resin was laminated on the PET sheet by a hot melt extrusion laminating method.

(Example 30)
In Example 29, a laminated glass was produced in the same manner as in Example 29 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 100 μm.

(Example 31)
In Example 29, a laminated glass was produced in the same manner as in Example 29 except that the thickness of the transparent resin layers 3 and 3 ′ in the intermediate layer was 150 μm.

(Example 32)
In Example 29, a laminated glass was produced in the same manner as in Example 29 except that an ethylene-vinyl acetate copolymer was used as the transparent resin layer 3 or 3 'in the intermediate layer.

(Example 33)
In Example 32, a laminated glass was produced in the same manner as in Example 32 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 100 μm.

(Example 34)
In Example 32, a laminated glass was produced in the same manner as in Example 32 except that the thickness of the transparent resin layers 3 and 3 ′ in the intermediate layer was 150 μm.

(Example 35)
In Example 23, a PET sheet B with an under layer of Production Example 2 having a thickness of 0.163 μm having an olefin resin on both sides and having a thickness of 0.163 μm (PET sheet with an easy-adhesion layer on both sides, Fuji A laminated glass was produced in the same manner as in Example 23 except that Film 1 was used. The transparent resin was laminated on the PET sheet by a hot melt extrusion laminating method.

(Example 36)
In Example 35, a laminated glass was produced in the same manner as in Example 35 except that the thickness of the transparent resin layers 3 and 3 ′ in the intermediate layer was 100 μm.

(Example 37)
In Example 35, a laminated glass was produced in the same manner as in Example 35 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 150 μm.

(Example 38)
In Example 35, a laminated glass was produced in the same manner as in Example 35 except that an ethylene-vinyl acetate copolymer was used as the transparent resin layer 3 or 3 'in the intermediate layer.

(Example 39)
In Example 38, a laminated glass was produced in the same manner as in Example 38 except that the transparent resin layers 3 and 3 ′ in the intermediate layer had a thickness of 100 μm.

(Example 40)
In Example 38, a laminated glass was produced in the same manner as in Example 38 except that the thickness of the transparent resin layers 3 and 3 ′ in the intermediate layer was 150 μm.

(Comparative Example 1)
In Example 1, a laminated glass was produced in the same manner as in Example 1 except that a PET sheet having a thickness of 188 μm without an under layer was used instead of the PET sheet A with an under layer in Production Example 1.

(Comparative Example 2)
In Example 1, as the transparent resin layers 3 and 3 ′ in the intermediate layer, a laminated glass was prepared in the same manner as in Example 1 except that a plasticized polyvinyl butyral solution was applied and dried to have a thickness of 260 μm. Produced.

(Comparative Example 3)
Between a pair of float glass FL3 (manufactured by Nippon Sheet Glass Co., Ltd.) that is not subjected to a tempering treatment such as a heat treatment having a plate thickness of 3.0 mm, a PVB intermediate layer having a thickness of 12 mil (= 304 μm) is formed. Laminated glass was produced.

(Comparative Example 4)
A laminated glass having a PVB intermediate layer having a thickness of 15 mil (= 380 μm) between a pair of float glass FL3 (manufactured by Nippon Sheet Glass Co., Ltd.), which is a commercially available laminated glass for crime prevention.

(Comparative Example 5)
A laminated glass having a PVB intermediate layer having a thickness of 30 mil (= 760 μm) between a pair of float glasses FL3, which is a commercially available laminated glass for crime prevention.

(Comparative Example 6)
A laminated glass having a PVB intermediate layer having a thickness of 60 mil (= 1,520 μm) between a pair of float glass FL3 (manufactured by Nippon Sheet Glass Co., Ltd.), which is a commercially available laminated glass for crime prevention.

(Comparative Example 7)
One sheet of float glass FL3 (thickness 3 mm; manufactured by Nippon Sheet Glass Co., Ltd.), which is a commercially available plate glass, was used.

(Comparative Example 8)
One sheet of float glass FL5 (thickness 5 mm; manufactured by Nippon Sheet Glass Co., Ltd.), which is a commercially available plate glass, was used.

  Next, Table 2 shows a list of the glass configurations of Examples 1 to 40 and Comparative Examples 1 to 8, and Table 3 shows the test results.

From the results of Table 2 and Table 3, many of the examples are the most resistant to PVB30 mil laminated glass of Comparative Example 5 with the most shipment amount among the commercially available laminated glasses. It was also found that the burn-out resistance was almost equal or higher.
By using a PET sheet with an under layer, the adhesion between the PET sheet and the transparent resin has been improved. As a result, the light resistance has been improved, and the floating of the laminated glass and the generation of bubbles after the light resistance test have been eliminated. Plasticized polyvinyl butyral, ethylene-vinyl acetate copolymer, and cross-linked ethylene-vinyl acetate copolymer, which have a weak long-term durability due to insufficient adhesion to the sheet, can be used for the transparent resin layer. It is also big.
In addition, since a rigid PET sheet effective for penetration resistance is used as a core, a transparent resin layer of plasticized polyvinyl butyral, ethylene-vinyl acetate copolymer, and cross-linked ethylene-vinyl acetate copolymer is thinner than before. As a result, the amount of heat and time required for the laminated glass manufacturing process can be greatly reduced, and the cost of the laminated glass itself can be reduced.

On the other hand, all the laminated glasses except Comparative Example 1 were subjected to a light resistance test and a heat resistance test on the specimen in accordance with JIS A3205. Both passability and heat resistance passed JIS A3205. There was no decrease in the visible light transmittance before and after the light resistance test, and the reduction rate of 10% or less, which is the standard of JIS A3205, was satisfied. In addition, no change in appearance such as discoloration and bubble generation was observed in the specimen after the heat resistance test.
Further, in Comparative Example 1, in the light resistance test, floating and bubbles were sporadically generated due to low adhesion between the plasticized polyvinyl butyral and the PET sheet.

  The laminated glass of the present invention is a transparent resin layer showing adhesiveness by heating and melting on both under layer surfaces of a sheet made of polyethylene terephthalate provided with an under layer on both sides for the purpose of enhancing adhesion to the transparent resin layer. And sandwiching the PET sheet with the under layer and the intermediate layer including the transparent resin layer between a pair of glass plates, the glass and the PET sheet are heated and melted with a viscoelastic transparent resin, and the transparent resin layer is bonded. In addition to impact resistance and penetration resistance, in addition to the most commonly used laminated glass for crime prevention (PVB30 mil) in the market, by directly bonding the glass plate to the glass plate, However, it is excellent in crime prevention that can make the time until the through hole is opened to be equal or longer.

  In addition, the laminated glass manufacturing method of the present invention shortens the laminated glass manufacturing process by various methods such as no autoclave, taking advantage of the fact that the thickness of the transparent resin layer to be melted by heating is thinner than that of conventional laminated glass. It is possible to provide an inexpensive laminated glass with excellent crime prevention.

  Therefore, the laminated glass of the present invention is a glass for building materials, such as a general detached house, an apartment house, an office screw, a store, a public facility, a factory facility, and an opening of a building, a partition, etc .; automobile, bus, truck, train It can be suitably used for window glass for various vehicles such as bullet trains, airplanes, passenger planes, and ships.

DESCRIPTION OF SYMBOLS 1 PET sheet 2, 2 'under layer 3, 3' transparent resin layer 4 Intermediate layer 5, 5 'Plate glass 6 Support part 7 Heating part

Claims (6)

A laminated glass having an intermediate layer between a pair of glass plates,
The intermediate layer has a transparent resin layer containing a transparent resin exhibiting adhesiveness by heat melting on both under layer surfaces of a sheet made of polyethylene terephthalate having an under layer on both sides,
Laminated glass, wherein the intermediate layer has a thickness of less than 700 μm.   The laminated glass according to claim 1, wherein the thickness of the sheet made of polyethylene terephthalate is 50 μm to 400 μm.   The laminated glass according to any one of claims 1 to 2, wherein the transparent resin comprises at least one selected from plasticized polyvinyl butyral, ethylene-vinyl acetate copolymer, and cross-linked ethylene-vinyl acetate copolymer. .   The laminated glass in any one of Claim 1 to 3 in which an under layer contains either an acrylic resin, a polyurethane resin, and polyolefin resin.   The laminated glass according to any one of claims 1 to 4, wherein at least one of a polyethylene terephthalate sheet, an under layer, and a transparent resin layer constituting the intermediate layer has at least one of an ultraviolet shielding function and an infrared shielding function. .   An intermediate layer having a transparent resin layer containing a transparent resin showing adhesiveness by heating and melting is sandwiched between a pair of glass plates on both under layer surfaces of a sheet made of polyethylene terephthalate having an under layer on both sides, and heat-treated. A method for producing a laminated glass, comprising melting the transparent resin layer and bonding and integrating the intermediate layer and the glass plate.