JP3095500B2 - Laminated glass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated glass and a method for producing the same, and more particularly, to a laminated glass which controls the transmittance of light and heat and has improved durability and practicality.

[0002]

2. Description of the Related Art The provision of a function of suppressing the transmittance of light and heat to glass has been described in Japanese Patent Application Laid-Open No. 64-63419. Further, as a general technique, such as laminating a thin film having a selective light transmittance or a transparent conductive function on a polymer film, or sandwiching the film between polyvinyl butyral films, is disclosed in JP-A-58-177345. Is disclosed.

When a selective light transmitting film or a transparent conductive film is formed on a polymer film, attention is paid to its flexibility, workability, impact resistance, uniform film forming property, continuous production, etc., as compared with a glass substrate. In addition, a laminated glass in which a polymer film having a functional thin film layer is combined with a window material of a building, an automobile, a home appliance, or the like has been widely studied, and some of the laminated glass has begun to be put into practical use.

However, a thin film having a function of selectively controlling the transmittance of light and heat used in the prior art (a thin film having a function of selectively controlling the transmittance of light and heat is described below. , A functional thin film) does not have sufficient durability and practical problems still remain. That is, water resistance, heat resistance, and the like were not sufficient, and discoloration, whitening, peeling, and the like occurred, and the original effect could not be exhibited.

As a countermeasure against this, in the case where a functional thin film is formed on a glass substrate, the functional thin film layer formed at the end portion is peeled off. However, it is applied to a polymer film having a functional thin film layer. If this is attempted, the size of the removed portion of the thin film, the complexity of the process, etc. will be extremely inferior in economical efficiency, and the durability of the obtained laminated glass is not necessarily sufficient, and the appearance is also inferior Becomes The present invention overcomes these problems,
It is intended to provide a novel laminated glass which is excellent in practical use.

[0006]

SUMMARY OF THE INVENTION The present invention provides a novel laminated glass having excellent durability, particularly excellent water resistance and moisture resistance.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a laminated glass in which a functional film having a selective light transmitting film on at least one side of a plastic film is laminated on an inorganic or organic glass by a bonding material. The laminated glass is provided with a protective layer having a moisture permeability of 80 g / m ² · 24 hr or less.

In the present invention, an effective configuration will be described with reference to the drawings. FIG. 1 and FIG. 2 are schematic partial cross-sectional views including a functional thin film which is one example of the present invention and is a selective light transmitting film. That is, the laminated glass includes the glass 1, the bonding material 2, the functional film 3, and the protective layer 4. The functional film 3 is obtained by forming a functional thin film 6 on a polymer film 5. In this figure, the thickness of the functional thin film is exaggerated, but the thickness is at most several hundred m to several μm. On the other hand, the thickness of the joining material
m to several hundred μm.

The selective light transmitting film used in the present invention is a thin film having a function of selectively controlling the transmittance of light and heat as described above, and is known per se. Usually, metals such as gold, silver, copper, platinum, iridium, palladium and nickel, alloys or mixtures thereof, metal oxides such as indium-tin oxide (ITO) and tin oxide, gold, silver, copper, platinum and iridium A laminate is used in which a metal thin film layer of, for example, palladium or nickel is sandwiched between transparent high refractive index thin film layers of ITO, tin oxide, tungsten oxide, zinc oxide, or the like.

In order to obtain a high visible light transmittance and a high infrared reflectance, a first transparent high refractive index thin film layer, a second layer containing silver, and a transparent high refractive index thin film layer are sequentially formed on a polymer film. Third layer, fourth layer containing silver, fifth layer of transparent high refractive index thin film layer
A five-layer laminate consisting of layers, or a sixth layer further containing silver,
A seven-layer laminate composed of a seventh transparent high refractive index thin film layer is preferably used.

As the polymer film, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT),
Polypropylene (PP), polyamide, polyvinyl chloride (PVC), polyvinyl fluoride (PVF), polycarbonate (PC), polyarylate (for example, Unitika U
Polymer), polyethersulfone (PES), polyetherimide (PEI), polyetheretherketone (PEEK), and other homopolymers or copolymers.

The thickness of the polymer film used in the present invention is usually from 10 to 500 μm, preferably from 20 to 200 μm, and more preferably from 50 to 100 μm.

As a bonding material, a known bonding material generally used for laminated glass is appropriately used. A typical example of the polybutylvinylal resin is used in the form of a film as well as a powder or a solution. When used in the form of a film, it is possible to use a film in which one surface is an uneven surface and the other is a smooth surface.
It is effective for improving the appearance. When forming the laminated glass, the smooth surface of the film as the bonding material is used on the functional film side, and the uneven surface side is used on the glass side. In addition, an ethylene-vinyl acetate (EVA) -based resin, a silicone-based resin, a polyurethane resin, or the like can also be used as the bonding material.

It is convenient to use these bonding materials alone, but in particular, it is also effective to use a plurality of bonding materials to improve durability. The type of the joining material is appropriately determined depending on the purpose and use of the joining material, and is not limited in the present invention.

The protective layer used in the present invention has a moisture permeability (JIS Z0208-73 method) of 80 g / m ² · 24 hours or less.
Preferably, it is 60 g / m ² · 24 hr or less, more preferably 20 g / m ² · 24 hr.
It is preferable to provide a polymer film or a resin layer of g / m ² · 24 hr or less.

Table 1 shows the moisture permeability of various resin layers. In the protective layer, in order to reduce moisture permeability to multiple polymer films or resin layers, or polymer films or resin layers,
Those having an inorganic layer formed thereon can be used.

[0017]

[Table 1] PVDC: Vinylidene chloride OPP: Biaxially oriented polypropylene PE: Polyethylene PET: Polyethylene terephthalate EVA: Ethylene-vinyl acetate The glass is not particularly limited. It is appropriately selected and used. Hereinafter, the present invention will be described in detail with reference to Examples.

[0018]

【Example】

Example 1 One side of PET having a thickness of 50 μm was In ₂ O ₃ (300 °) / silver (90 °) / In ₂ O ₃ (700 °) / by DC magnetron sputtering.
A silver (90 °) / In ₂ O ₃ (400 °) film was formed to produce a functional film. Thickness on the sputter surface of the functional film
A 12 μm biaxially oriented polypropylene film (OPP) was bonded with a urethane-based adhesive to form a protective layer. The film is sandwiched between two 0.38-mm-thick polybutylvinylals, and further sandwiched between 2 mm-thick transparent plate glasses, and then adhered under pressure at 120 ° C. and 10 kg / cm ² to form a laminated glass. Produced. This laminated glass is heated to 50 ° C and 95% relative humidity.
For 90 days, a moisture resistance test was performed, and the appearance change, visible light transmittance and solar radiation transmittance before and after the test were measured. As shown in Table 2, a laminated glass having excellent durability was obtained.

Example 2 The same film as in Example 1 was coated on one side of the film by DC magnetron sputtering to obtain In ₂ O ₃ (500 °) / silver (150 °) / In ₂ O ₃ (500 °).
Ii) A film was formed to produce a functional film. 8μm thick biaxially stretched PET on sputtered surface of functional film
The film was adhered with a urethane-based adhesive to form a protective layer. A laminated glass was produced from the film in the same manner as in Example 1, and the moisture resistance test performed in Example 1 was performed. The results are shown in Table 2.

Example 3 Example 1 was prepared on a biaxially stretched nylon film having a thickness of 25 μm.
A functional thin film similar to that described above was formed, and the OPP used in Example 1 was used.
Was adhered to both surfaces with a urethane-based adhesive to form a protective layer. A laminated glass was produced from the film in the same manner as in Example 1, and the moisture resistance test performed in Example 1 was performed. The results are shown in Table 2. As is clear from the table, a laminated glass having excellent durability was obtained.

Example 4 A vinylidene chloride resin (PVDC) was applied to the functional film produced in Example 1 and dried to form a protective layer.
A laminated glass was produced in the same manner as in Example 1. Example 1
The results were shown in Table 2. As is clear from the table, a laminated glass having excellent durability was obtained.

Example 5 A polyethylene film (PE) having a thickness of 12 μm was adhered to the functional film produced in Example 2 with an acrylic adhesive to form a protective layer. A laminated glass was produced in the same manner as in Example 1. The moisture resistance test performed in Example 1 was performed, and the results are shown in Table 2. As is clear from the table, a laminated glass having excellent durability was obtained.

Comparative Example 1 A laminated glass having the same structure as in Example 1 except that no OPP film as a protective film was included was prepared and subjected to a moisture resistance test. The results are shown in Table 2.

COMPARATIVE EXAMPLE 2 In ₂ O ₃ (300 °) / silver (90 °) / In ₂ O ₃ (700) was applied to a 25 μm-thick nylon film by DC magnetron sputtering.
Å) / Silver (90Å) / In ₂ O ₃ (400Å) film was formed to prepare a functional film. A nylon film of the same thickness was adhered to the sputtered film surface with a urethane-based adhesive. The film is sandwiched between two sheets of polybutyl vinyl with a thickness of 0.38 mm,
After sandwiching it between 2mm thick transparent glass sheets,
A laminated glass was prepared by pressure bonding at 10 ° C. and 10 kg / cm ² to perform a moisture resistance test. The results are shown in Table 2.

Comparative Example 3 The sputtered film surface of the functional film produced in Comparative Example 2
VA was adhered. A laminated glass was produced in the same manner as in Comparative Example 2, and a moisture resistance test was performed. The results are shown in Table 2.

[0026]

[Table 2] Tsol: sunlight transmittance Tvis: visible light transmittance

[0027]

As is clear from the above Examples and Comparative Examples, a laminated glass having significantly improved durability of a functional film can be economically obtained by the present invention, and can be used for windows of buildings, automobiles, home electric appliances and the like. Used in the manufacture of specialty glass used for materials.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a preferred configuration of the present invention.

FIG. 2 is a schematic diagram showing an example of another preferred configuration of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass 2 Bonding material 3 Functional film 4 Protective layer 5 Polymer film 6 Functional thin film

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B32B 1/00-35/00

Claims (1)

(57) [Claims] 1. In a laminated glass in which a plastic film having a selective light transmitting film is laminated on an inorganic or organic glass, a moisture permeability on the selective light transmitting film is 80 g / cm ² · 24 h.
r A laminated glass characterized by having the following protective layer.