JP3150356B2 - Laminated glass and its manufacturing method - 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, and a method for producing the same.

[0002]

2. Description of the Related Art It is disclosed in Japanese Patent Application Laid-Open No. 64-6341 to provide glass with a function of suppressing the transmittance of light and heat.
No. 9 and the like. Techniques such as laminating a thin film having a selective light transmitting property or a transparent conductive function on a polymer film, and sandwiching the thin film with a polyvinyl butyral film are also known as general techniques as disclosed in JP-A-58-17734.
No. 5, gazette.

However, a thin film having a function of selectively controlling light and heat transmittance used in the prior art (a thin film having a function of selectively controlling light and heat transmittance is hereinafter referred to as a functional film). Is not sufficiently durable, and practical problems still remain. That is, water resistance, heat resistance, chemical resistance, and the like were not sufficient, and discoloration, whitening, peeling, and the like occurred, so that the original effects could not be exhibited.

Japanese Patent Application Laid-Open No. 64-63419 discloses a preferred example of avoiding this problem in which the functional thin film is not provided on the glass end face. In the technique of providing a functional thin film directly on a glass surface, it is necessary to deposit a thin film on a peripheral portion, and such a measure is possible.

[0005] On the other hand, laminated glass via a polymer film having a functional thin film layer has been widely studied for window materials of buildings, automobiles, home appliances and the like. However, when the above-mentioned means is applied to a polymer film having a functional thin film layer, the size of the removed portion of the thin film, the complexity of the process, etc. become extremely inferior in economical efficiency, and the durability of the obtained laminated glass is reduced. Is not always sufficient, and the appearance is inferior.

The present invention overcomes these problems, and provides a novel laminated glass excellent in practical use and a method for producing the same.

[0007]

The laminated glass of the present invention is a laminated glass having a glass layer, a bonding material layer, a functional film layer, a bonding material layer and a glass layer in this order.
The functional film layer is made of a polymer film having a functional thin film layer having a discontinuous portion that makes the end and the inside substantially discontinuous.

The structure effective in the present invention will be described with reference to the drawings. FIG. 1 is one of the embodiments of the present invention, and is a schematic partial sectional view including an intermittent portion of a functional thin film. That is, the laminated glass includes the glass 1, the bonding material 2, and the functional film 3. The functional film 3 is a polymer film 6
3 shows that the functional thin film 4 having the intermittent portion 5 is formed, and the intermittent portion 5 of the functional thin film 4 is configured to be filled with the bonding material 2. In this figure, the curtain thickness of the functional thin film is exaggerated, but the thickness is at most several hundreds of μm to several μm. On the other hand, the thickness of the bonding material is in the range of tens of μm to several hundred μm, and the ratio of the thickness of the functional thin film to the bonding material is 1/10 or less. The intermittentness of the thin film can be confirmed by observation with the naked eye, a magnifying glass, a microscope, or the like, or by measurement of electric resistance when the thin film is conductive. FIG. 2 is a plan view showing an example of the embodiment of the present invention. As shown in the figure, an intermittent portion 8 is located at a position 3 mm or more inward from the glass end 7.
Exists. The width of the intermittent portion 8 varies depending on the properties of the joining material. If the width is 50 μm or more, the effect of durability is exhibited. For example, the width when using a polyvinyl butyral resin as a bonding material for laminated glass is preferably 1 mm or more, more preferably 3 mm or more and 15 mm or less. FIG. 3 is also a plan view showing an example of the embodiment of the present invention, but shows that the interrupted portion 10 does not necessarily need to be continuous along the periphery 9 of the glass. Usually, it is preferable that the intermittent portion is present at 70% or more of the length around the glass, and such a mode is included in a state where the end portion and the inside are substantially discontinuous. The intermittent portion is preferably linear (including a dotted line), and its position is near the edge 3 mm or more inside the edge of the glass as described above. The meaning of the vicinity of the end is not limited and means that it is desirable to be as close to the end as possible within the range where the effect can be exhibited. Usually, it is preferable to be within 5 mm from the end.

In the method for producing a laminated glass of the present invention, in producing a laminated glass having the above structure, a part of a functional thin film layer of a polymer film having a functional thin film layer on an entire surface is removed to form an intermittent portion, When the intermittent portion is formed into a laminated glass, the end and the interior are provided in a discontinuous state in the vicinity of the end which is at least 3 mm from the end of the glass, and this is laminated on the glass via a bonding material. It is characterized by the following.

The functional thin 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 gold, silver,
Metals such as copper, platinum, iridium, palladium, nickel, tin, aluminum and their alloys, or mixtures,
Inorganic thin films of oxides, nitrides, carbides, and the like such as indium-tin-oxide (ITO), tin, titanium, indium, tungsten, zirconium, silicon, and cadmium are used in a single layer or a plurality of layers. The material and the layer structure of these functional thin films are appropriately determined according to the purpose and use of the functional thin film, and are not limited in the present invention.

As the polymer film, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT),
Polyethylene (PE), polypropylene (PP), nylon, polyvinyl chloride (PVC), polyvinyl fluoride (PVF), polycarbonate (PC), polyarylate (for example, Unitika U-polymer), ethylene vinyl acetate (EVA), polyacryl Films such as polyimide, polyimide (PI), polyamide, polyethersulfone (PES), and polyetheretherketone (PEEK) are used. The type of the polymer film is appropriately determined depending on the purpose and use of the polymer film, and is not limited in the present invention. As a matter of course,
Commercially available functional films can also be effectively used in the present invention.

As the bonding material, a known bonding material generally used for laminated glass is appropriately used. A typical example is polyvinyl butyral resin. The polyvinyl butyral resin can be used in the form of a film or in the form of a powder or a solution. When used in the form of a film, it is effective to use a film in which one surface is an uneven surface and the other is a smooth surface in order to improve 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 a powder or solution state, it functions as a bonding material by being applied to a functional film or glass and then heated and compressed. Also, ethylene-
Vinyl acetate (EVA) resins, silicone resins, polyurethane resins, and the like can also be used as the bonding agent. 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 bonding material is appropriately determined depending on the purpose and use of the bonding material, and is not limited in the present invention. The glass is not particularly limited, and glass for automobiles, buildings, and the like is appropriately selected and used according to its use.

In the present invention, the intermittent portion of the functional film is formed by (a) irradiation with a laser beam, (b) contact with a high-temperature heating body, (c) mechanical removal means, and (d) erosion by a chemical. Is preferably used. The intermittent portion is preferably formed before the bonding material is provided, but may be formed in a lamination intermediate process such as after bonding one glass. Hereinafter, each will be described.

(A) Irradiation of laser light A laser device can be appropriately selected and used depending on the light absorption coefficient of the functional thin film, and thus there is no particular limitation on the laser device. Since the functional thin film absorbs light in the near-ultraviolet light, visible light, and near-infrared light regions (light wavelength of 300 to 2500 nm), a laser device that emits light having a wavelength in this region is effective. Specifically, the fundamental wave (1.06 μm) of the YAG laser used for laser processing is used.
m), the second harmonic (532 nm) or a dye laser (500 to 800 nm) can be used effectively. The control of the width of the intermittent part is determined by the laser power. Increasing the laser output increases the intermittent width. However, if the output is excessively increased, the polymer film may be damaged, which is not preferable. In addition, the shape of the intermittent portion can be changed depending on the laser oscillation frequency. The laser light is squeezed by a lens and is applied to the functional thin film. The laser beam or the functional film is moved to form the intermittent portion, and the shape of the intermittent portion changes depending on the magnitude of the moving speed. In other words, these processing conditions affect the energy injected into the functional thin film as the workpiece by the laser beam. Therefore, these laser processing conditions are within the range of design conditions and are not particularly limited.

(B) Contact with High Temperature Heating Body Preferably, contact with a nichrome wire filament or the like heated by energization is used. The width of the intermittent portion is controlled by the thickness of a filament such as a nichrome wire and the contact time with a hot filament. If the contact time is too long, the plastic film as a base material is thermally damaged, which is not preferable.

(C) Mechanical removal means Specifically, the thin film is cut and removed with a sharp object such as a blade. Examples of the blade used include a diamond scriber and a cutout. The control of the width of the intermittent portion is determined by the size of the tip of the blade and the load at the time of cutting. If the tip of the blade is too thin or too sharp, or if the load at the time of cutting is too large, the damage to the plastic film as the base material is undesirably increased.

(D) Erosion by Chemicals Depending on the type of the functional thin film, it is brought into contact with a chemical that erodes (dissolves) it. After the formation of the intermittent portion, it is preferable to wash and remove the chemical and then dry it. The control of the width of the intermittent portion is determined by the contact time and the contact width with the eroding chemical and the chemical concentration. Here, for the purpose of the present invention, it is preferable that after forming the intermittent portion, the residual chemical is washed away, and dried to maintain the durability of the functional thin film.

[0018]

Example 1 A laminated glass as shown in FIG. 1 was formed. That is, ITO / silver /
After forming the ITO laminated thin film 4 with a thin film of 1000 °, a hot filament of a nichrome wire is brought into contact with the thin film 4 to make the intermittent portion 5 1 mm.
Thus, a functional film 3 of the present invention was obtained. The 3 mm-thick float glass 1 and the 0.19 mm-thick PVB film 2 are laminated so that the intermittent portion 5 of the functional film 3 is located 3 mm inward from the edge of the glass, and a laminated glass is formed by a conventional method. Formed. To verify the effect of the present invention, three sides of the end face of the laminated glass were sealed with silicone resin. Salt water was sprayed on portions not sealed with silicone resin to test the durability of the functional thin film. After a continuous salt spray test for one week, an appearance inspection revealed that the durability of the functional film was extremely improved without whitening or discoloration as well as peeling of the functional thin film inside the intermittent part. .

[0019]

Comparative Example 1 In Example 1, a laminated glass was formed using a functional thin film having no intermittent portions, and sprayed with salt water. The functional thin film is discolored from the end to the inside in the portion not sealed with the silicone resin from the time when the salt spray was performed for one day, and on the third day, the functional thin film is completely discolored (whitened). However, some cracks also occurred.

[0020]

Example 2 In Example 1, the intermittent portion was irradiated with a fundamental wave of YAG (1.06 μm) at an oscillation frequency of 3 kHz, a moving speed of 50 mm / sec, and a laser output of 4 W. Was 50 μm on average. After applying a silicone resin to the intermittent portion, a laminated glass for a test was formed in the same manner as in Example 1, and a salt spray test was performed. Despite the intermittent width being as narrow as 50 μm, no change in appearance was observed even after a one-week continuous salt spray test by using a combination of a silicone resin and a PVB film as a bonding agent.

[0021]

Example 3 In Example 1, the intermittent portion was formed by cutting with a diamond scriber. Its width is 0.2 mm. Processing was performed in the same manner as in Example 1, and similar results were obtained.

[0022]

Example 4 In Example 1, the intermittent portion was formed by contact with absorbent cotton impregnated with hydrochloric acid. Its width is 2mm
It is. Processing was performed in the same manner as in Example 1, and similar results were obtained.

[0023]

Industrial Applicability According to the present invention, a laminated glass in which the durability of a functional film is remarkably improved can be economically obtained, and the laminated glass is used as a technique for manufacturing a special glass used for window materials of buildings, automobiles, home electric appliances and the like. You.

[Brief description of the drawings]

FIG. 1 is a partial schematic cross-sectional view of one embodiment of the present invention.

FIG. 2 is a schematic plan view of one embodiment of the present invention.

FIG. 3 is a schematic plan view of one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Glass 2 ... Bonding material 3 ... Functional film 4 ... Functional thin film 5 ... Intermittent part 6 ... Polymer film 7 ... Edge of glass 8 ... Intermittent Part 9: around glass 10: discontinuous intermittent part

Continuation of the front page (72) Inventor Tamotsu Kamijima 3-5-2 Kasumigaseki, Chiyoda-ku, Tokyo Examiner, Mitsui Toatsu Chemicals Co., Ltd. Kenichi Kamono (56) References JP-A-63-147844 (JP, A) Kaihei 2-74337 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 C03C 27/12

Claims (5)

(57) [Claims] When producing a laminated glass having a glass layer, a bonding material layer, a functional film layer, a bonding material layer and a glass layer in this order, a functional thin film layer of a polymer film having a functional thin film layer on the entire surface. A part of the glass is removed to form an intermittent portion, and when the intermittent portion is made into a laminated glass, the end and the inside are substantially discontinuous in the vicinity of the end portion which is 3 mm or more inside from the end of the glass. And laminating the same on a glass via a bonding material. 2. The method according to claim 1, wherein the intermittent portion is provided by irradiating a laser beam. 3. The method of claim 1 wherein said intermittent portion is provided by contact with a high temperature heater. 4. The method of claim 1, wherein said interrupted portion is provided by mechanical removal means. 5. The method according to claim 1, wherein the intermittent portion is provided by contact with a chemical which erodes the functional thin film.