WO2016158635A1

WO2016158635A1 - Laminated glass plate

Info

Publication number: WO2016158635A1
Application number: PCT/JP2016/059301
Authority: WO
Inventors: 勝貴中瀬; 村田　浩一; 山田　浩二; 晴信黒岩
Original assignee: 東洋紡株式会社
Priority date: 2015-03-31
Filing date: 2016-03-24
Publication date: 2016-10-06
Also published as: JPWO2016158635A1; JP6763370B2; TWI691406B; TW201637845A

Abstract

The present invention solves the problem of color unevenness or the like in a glass plate formed by laminating a transparent resin molded body. In a laminated glass plate according to the present invention, an orientation film having a retardation of 3000-150000 nm, a transparent resin molded body, and a glass plate are laminated.

Description

Laminated glass plate

A laminated glass plate in which an oriented film, a transparent resin molded body, and a glass plate are laminated is disclosed.

Transparent resin moldings are excellent in physical impact resistance and light transmission, so window materials used in general buildings and high-rise buildings, lighting from roofs, frames and display cases, automobiles and trains It is widely used for window materials used for vehicles such as.

However, the transparent resin molded body is comparable to glass, which is an inorganic material, in terms of transparency and excellent daylighting properties, but is inferior to glass in terms of chemical resistance, weather resistance, and scratch resistance. Also, the surface texture does not reach that of glass, and glass is more suitable for producing a high-class feeling.

From such a viewpoint, many glass plates in which a glass plate is laminated on a transparent resin molded body have been proposed. For example, Patent Document 1 proposes a laminated glass plate in which glass / polyvinyl butyral / polycarbonate / polyvinyl butyral / glass are sequentially laminated. Patent Document 1 proposes that each of the advantages of the glass plate and the transparent resin molded body is complemented by sandwiching the transparent resin molded body with a glass plate having excellent weather resistance and scratch resistance. .

JP-A-6-915

When a laminated glass plate combining a transparent resin molded body and a glass plate is used, for example, for a window glass of a building such as a high-rise building, when the window glass is irradiated with light such as sunlight and a fluorescent lamp, A problem was found in which colored spots (including rainbow spots) were observed.

Also, resin materials are rich in color variations compared to glass, and are used in various products such as colorless and highly transparent products, transparent colored products, and opaque colored products. For example, a decorative article cover and case. Also in these applications, for example, a problem has been found in which slightly colored spots appear when external light is reflected by a transparent resin molding.

It is a problem to solve the problem of color spots in a glass plate in which these transparent resin moldings are laminated.

It has been found that the above problem can be solved by using an oriented film whose retardation is controlled to 3000 nm or more and 150,000 nm or less. Based on such knowledge, the invention represented by the following is provided.

Item 1.
An oriented film having a retardation of 3000 to 150,000 nm,
Transparent resin molded body and glass plate,
A laminated glass plate laminated.
Item 2.
Item 2. The laminated glass sheet according to Item 1, wherein the transparent resin molded body is formed of at least one resin selected from the group consisting of an acrylic resin and a polycarbonate resin.
Item 3.
Item 3. The laminated glass plate according to Item 1 or 2, wherein the oriented film is a polyester film.
Item 4.
Item 4. The laminated glass sheet according to any one of Items 1 to 3, which is used for building materials.
Item 5
The laminated glass sheet according to any one of claims 1 to 3, which is used for vehicles.
Item 6.
An oriented film having a retardation of 3000 to 150,000 nm,
Transparent resin molded body and glass plate,
Laminated window glass.

Provided is a laminated glass plate in which the occurrence of color spots (rainbow spots) when irradiated with white light such as sunlight and fluorescent lamps is provided. In a preferred embodiment, the color spots to be suppressed are color spots that are observed in a state in which a part of light irradiated to the laminated glass plate from an oblique direction is reflected.

The laminated glass plate is preferably laminated with an oriented film having a retardation of 3000 to 150,000 nm, a transparent resin molded product, and a glass plate. The stacking order of the oriented film, the transparent resin molded body, and the glass plate is arbitrary. A specific stacking order will be described later. In one embodiment, the laminated glass plate preferably has an oriented film on at least one surface of the transparent resin molded body, and more preferably has an oriented film on both surfaces. Moreover, in one Embodiment, it is preferable that the laminated glass plate has the glass plate laminated | stacked on the at least one surface of the transparent resin laminated body, and it is more preferable that the glass plate is laminated | stacked on both surfaces. These specific configurations will be described later.

<Oriented film>
The retardation of the alignment film is preferably 3000 nm or more and 150,000 nm or less from the viewpoint of reducing color spots. In this document, retardation means retardation at a measurement wavelength of 589 nm unless otherwise specified. Further, in this document, when simply described as “retardation”, it means in-plane retardation. From the viewpoint of more effectively suppressing the occurrence of rainbow spots, the lower limit value of the retardation of the oriented film is preferably 4500 nm or more, preferably 6000 nm or more, preferably 8000 nm or more, preferably 10,000 nm or more. On the other hand, the upper limit of the retardation of the oriented film is that the effect of improving the visibility is not substantially obtained even if an oriented film having a retardation higher than that is used, and depending on the height of the retardation, Since the thickness also tends to increase, it is set to 150,000 nm from the viewpoint that it may be contrary to the demand for thinning the laminated glass plate, but it can also be set to a higher value. When having an oriented film on both surfaces of a transparent resin molding, the retardation of two oriented films may be the same or different.

From the viewpoint of more effectively suppressing color spots, the orientation film has a ratio (Re / Rth) of retardation (Re) to thickness direction retardation (Rth) of preferably 0.2 or more, preferably 0.5 or more, preferably 0.6 or more. Thickness direction retardation means an average value of retardation obtained by multiplying two birefringences ΔNxz and ΔNyz by film thickness d when viewed from a cross section in the film thickness direction. As Re / Rth is larger, the birefringence action is more isotropic, and the occurrence of color spots can be more effectively suppressed. Thickness direction retardation is also measured at a measurement wavelength of 589 nm.

The maximum value of Re / Rth is 2.0 (that is, a perfect uniaxial symmetry film), but the mechanical strength in the direction perpendicular to the orientation direction tends to decrease as the perfect uniaxial symmetry film is approached. is there. Therefore, the upper limit of Re / Rth of the polyester film is preferably 1.2 or less, and preferably 1.0 or less.

Retardation can be measured according to a known method. Specifically, it can be determined by measuring the refractive index and thickness in the biaxial direction. It can also be determined using a commercially available automatic birefringence measuring apparatus (for example, KOBRA-21ADH: manufactured by Oji Scientific Instruments).

The oriented film can be produced by appropriately selecting a known method. For example, the alignment film is a polyester resin, a polycarbonate resin, a polystyrene resin, a syndiotactic polystyrene resin, a polyether ether ketone resin, a polyphenylene sulfide resin, a cycloolefin resin, a liquid crystalline polymer resin, and a liquid crystal compound added to a cellulose resin. It can manufacture using 1 or more types selected from the group which consists of resin. Therefore, the orientation film is a polyester film, polycarbonate film, polystyrene film, syndiotactic polystyrene film, polyetheretherketone film, polyphenylene sulfide film, cycloolefin film, liquid crystalline film, film in which a liquid crystal compound is added to a cellulose resin. It can be.

The preferred raw material resin for the oriented film is one or more resins selected from the group consisting of polycarbonate, polyester, and syndiotactic polystyrene. These resins are excellent in transparency and excellent in thermal and mechanical properties, and the retardation can be easily controlled by stretching. Polyesters typified by polyethylene terephthalate and polyethylene naphthalate have a large intrinsic birefringence, and can be obtained relatively easily even when the film is thin, so that they are preferable as raw materials for oriented films. In particular, polyethylene naphthalate has a large intrinsic birefringence among polyesters, and therefore is suitable for a case where it is desired to make the retardation particularly high or a case where it is desired to reduce the film thickness while keeping the retardation high.

<Method for producing oriented film>
Below, the manufacturing method of an oriented film is demonstrated to a polyester film as an example. The polyester film can be obtained by condensing an arbitrary dicarboxylic acid and a diol. Examples of the dicarboxylic acid include terephthalic acid, isophthalic acid, orthophthalic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, and diphenylcarboxylic acid. Acid, diphenoxyethanedicarboxylic acid, diphenylsulfonecarboxylic acid, anthracenedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, hexahydroterephthalic acid, hexahydroisophthalic acid Acid, malonic acid, dimethylmalonic acid, succinic acid, 3,3-diethylsuccinic acid, glutaric acid, 2,2-dimethylglutaric acid, adipic acid, 2-methyladipic acid, trimethyladipic acid, pimelic acid, azelaic acid, Dimer , It may be mentioned sebacic acid, suberic acid, dodecamethylene dicarboxylic acid.

Examples of the diol include ethylene glycol, propylene glycol, hexamethylene glycol, neopentyl glycol, 1,2-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, decamethylene glycol, 1,3-propanediol, 1,4 -Butanediol, 1,5-pentanediol, 1,6-hexadiol, 2,2-bis (4-hydroxyphenyl) propane, bis (4-hydroxyphenyl) sulfone and the like.

The dicarboxylic acid component and the diol component constituting the polyester film may be used alone or in combination of two or more. Specific polyester resins constituting the polyester film include, for example, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc., preferably polyethylene terephthalate and polyethylene naphthalate, preferably polyethylene terephthalate. . The polyester resin may contain other copolymer components. From the viewpoint of mechanical strength, the proportion of the copolymer components is preferably 3 mol% or less, preferably 2 mol% or less, more preferably 1.5 mol% or less. . These resins are excellent in transparency and excellent in thermal and mechanical properties. Moreover, retardation of these resins can be easily controlled by stretching.

The polyester film can be obtained according to a general production method. Specifically, the polyester resin is melted and the non-oriented polyester extruded and formed into a sheet shape is stretched in the longitudinal direction by utilizing the speed difference of the roll at a temperature equal to or higher than the glass transition temperature, and then in the transverse direction by a tenter. An oriented polyester film is mentioned by extending | stretching and heat-processing. The polyester film may be a uniaxially stretched film or a biaxially stretched film. The oriented film may be stretched at an angle of 45 degrees.

The production conditions for obtaining the polyester film can be appropriately set according to a known method. For example, the longitudinal stretching temperature and the transverse stretching temperature are usually 80 to 130 ° C., preferably 90 to 120 ° C. The longitudinal draw ratio is usually 1.0 to 3.5 times, preferably 1.0 to 3.0 times. The transverse draw ratio is usually 2.5 to 6.0 times, preferably 3.0 to 5.5 times.

The retardation can be controlled within a specific range by appropriately setting the stretching ratio, stretching temperature, and film thickness. For example, it becomes easier to obtain a higher retardation as the stretching ratio between the longitudinal stretching and the lateral stretching is higher, the stretching temperature is lower, and the film is thicker. On the contrary, it becomes easier to obtain a lower retardation as the stretching ratio between the longitudinal stretching and the lateral stretching is lower, the stretching temperature is higher, and the film thickness is thinner. Moreover, the higher the stretching temperature and the lower the total stretching ratio, the easier it is to obtain a film having a lower ratio of retardation to thickness direction (Re / Rth). Conversely, a film having a higher ratio of retardation to thickness direction retardation (Re / Rth) can be obtained as the stretching temperature is lower and the total stretching ratio is higher. Further, the heat treatment temperature is usually preferably 140 to 240 ° C, and preferably 180 to 240 ° C.

In order to suppress retardation fluctuation in the polyester film, it is preferable that the thickness unevenness of the film is small. If the longitudinal stretching ratio is lowered to make a retardation difference, the value of the longitudinal thickness unevenness may be increased. Since there is a region where the value of the vertical thickness unevenness becomes very high in a specific range of the draw ratio, it is desirable to set the film forming conditions so as to exclude such a range.

The thickness unevenness of the oriented film is preferably 5.0% or less, more preferably 4.5% or less, still more preferably 4.0% or less, and 3.0% or less. Is particularly preferred. The thickness unevenness of the film can be measured by any means. For example, a tape-like sample (length 3 m) continuous in the film flow direction is collected, and 100 cm at a 1 cm pitch using a commercially available measuring instrument (for example, an electronic micrometer manufactured by Seiko EM Co., Ltd. Millitron 1240). The thickness of the point is measured, the maximum value (dmax), the minimum value (dmin), and the average value (d) of the thickness are obtained, and the thickness unevenness (%) can be calculated by the following formula. Thickness unevenness (%) = ((dmax−dmin) / d) × 100

The thickness of the oriented film is not particularly limited. For example, the lower limit of the thickness of the oriented film is 20 μm or more, preferably 50 μm or more, and the upper limit of the thickness of the oriented film is 300 μm or less, preferably 250 μm or less.

<Transparent resin molding>
The transparent resin molding can be produced by appropriately selecting a known technique from a thermoplastic resin having transparency. Examples of the raw material resin for the transparent resin molding include polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polystyrene (PS), acrylic resin, vinyl chloride resin, and polymethylpentene (PMP). . Among these, from the viewpoint of excellent mechanical strength, at least one selected from the group consisting of polycarbonate (PC) and acrylic resin is preferable.

The transparent resin molded body may have an arbitrary shape, and may be, for example, a planar shape such as a film or a sheet, a curved surface shape, a casing, or a part of the casing.

A transparent resin molded body typically has a portion having a retardation of 150 nm or more.

The thickness of the transparent resin molded body is arbitrary, but is, for example, 0.1 mm or more or 0.2 mm or more. The upper limit of the thickness of the transparent resin molded body is, for example, 5 mm or less or 4 mm or less.

The method for producing the transparent resin molded body is not particularly limited, and a molding method generally adopted for the thermoplastic resin composition can be arbitrarily adopted. For example, when the transparent resin molding is an unstretched sheet, a melt extrusion method, a calender molding method, an injection molding method, a sheet press molding method, a vacuum molding method, a pressure molding method, and the like can be exemplified. The transparent resin molded body may be a multilayer sheet, or a stretched or unstretched film obtained by in-mold molding, insert molding, or the like.

Even if the transparent resin molded body is not stretched, the molecules are oriented with the remnant of flow or distortion during molding. In particular, in the injection-molded product, the molecules have an irregular orientation. Because of this, it is assumed that color spots are observed when external light is applied to the transparent resin molded product, but it is easy to stack an alignment film on at least one surface of the transparent resin molded product. With the configuration, the occurrence of color spots can be suppressed.

<Glass plate>
As long as the glass plate is a glass plate used for windows of buildings or vehicles, or display cases, the material, shape, size, and the like are arbitrary and are not particularly limited. The glass plate may be flat or curved. The glass constituting the glass plate is, for example, silicate glass, preferably one or more selected from the group consisting of silica glass, borosilicate glass, soda lime glass, and aluminosilicate glass, and more preferably. Is alkali-free glass. Although glass is generally excellent in weather resistance, when an alkali component is contained in the glass, if the glass is used in a situation where it is exposed to the external environment for a long period of time, cations are dropped on the surface, A so-called soda blowing phenomenon occurs, the structure becomes rough, and the translucency of the glass may be deteriorated. The alkali-free glass is a glass that does not substantially contain an alkali component (alkali metal oxide), and specifically, a glass having an alkali component weight ratio of 1000 ppm or less. The weight ratio of the alkali component contained in the glass is preferably 500 ppm or less, more preferably 300 ppm or less. Moreover, chemically tempered glass or physical tempered glass can also be used as glass. In one embodiment (for example, when a laminated glass plate is used for window glass), the glass plate is preferably a glass plate formed of soda lime glass (soda glass).

The thickness of the glass plate is arbitrary. The lower limit of the thickness of the glass plate is preferably 10 μm or more, more preferably 50 μm or more, and still more preferably 100 μm or more. The upper limit of the thickness of the glass plate is preferably 1.5 cm or less, preferably 1 cm or less, preferably 0.7 cm or less, preferably 0.5 cm or less, preferably 0.3 cm or less, preferably 1000 μm or less, more preferably 500 μm. Hereinafter, it is more preferably 300 μm or less. The greater the thickness of the glass plate, the higher the strength of the laminated glass plate. On the other hand, as the thickness of the glass plate is thinner, the weight in the thickness of the laminated glass plate can be reduced. In one embodiment, the thickness of the glass plate is preferably smaller than the thickness of the transparent resin molded body. Thereby, since the ratio for which a glass plate accounts in a laminated glass plate reduces, the weight reduction of a laminated glass plate can be achieved. Moreover, when using chemically strengthened glass as glass, it is preferable that the thickness is 300 micrometers or more and 1000 micrometers or less.

The density of the glass is preferably low. Thereby, the weight reduction of glass can be achieved and the weight reduction of a laminated glass board can be achieved by extension. Specifically, the density of the glass is preferably 2.6 g / cm ³ or less, and more preferably 2.5 g / cm ³ or less.

A glass plate satisfying such characteristics is known and can be obtained by any manufacturing method.

When laminating an oriented film, a transparent resin molded body, and a glass plate, a known adhesive can be used. The kind of adhesive is arbitrary and is not particularly limited.

The structure of the laminated glass is arbitrary as long as the above-described oriented film, transparent resin molded body, and glass plate are laminated. Examples of suitable stacking order (configuration) of the assumed laminated glass are given below.
(A) Glass plate / alignment film / transparent resin molded body / alignment film / glass plate (B) glass plate / alignment film / transparent resin molding / glass plate (C) glass plate / alignment film / transparent resin molding / glass Plate / alignment film (D) glass plate / alignment film / transparent resin molding (E) orientation film / glass plate / transparent resin molding (F) glass plate / transparent resin molding / alignment film

The oriented film, the transparent resin molded body, and the oriented film may be laminated via a functional layer (easy-adhesive layer) for promoting their adhesion in addition to the adhesive.

In one embodiment, the laminated glass plate is used as a window glass of a building. In one embodiment, the laminated glass plate is used as a window glass (including a windshield) for vehicles such as automobiles, trains, ships, and airplanes. In one embodiment, the laminated glass plate is used as a glass plate for a display case or a picture frame. The shape and size of the laminated glass plate are arbitrary and are not particularly limited, and may be flat or curved.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by the following examples, and is implemented with appropriate modifications within a range that can be adapted to the gist of the present invention. These are all included in the technical scope of the present invention.

<Preparation of oriented film>
Oriented film 1
PET resin pellets having an intrinsic viscosity of 0.62 dl / g were dried under reduced pressure (1 Torr) at 135 ° C. for 6 hours, then supplied to an extruder and dissolved at 285 ° C. This polymer is filtered with a filter material of stainless sintered body (nominal filtration accuracy 10 μm particle 95% cut), extruded into a sheet form from the die, and then applied to a casting drum having a surface temperature of 30 ° C. using an electrostatic application casting method It was wound and solidified by cooling to make an unstretched film.

The unstretched film was guided to a tenter stretching machine, guided to a hot air zone at a temperature of 125 ° C. while being gripped by a clip, and stretched 4.0 times in the width direction. Next, while maintaining the width stretched in the width direction, the film was treated at 225 ° C. for 30 seconds, and further subjected to a 3% relaxation treatment in the width direction to obtain a uniaxially oriented film 1 having a film thickness of about 100 μm. . The retardation value was 10200 nm. Rth was 13233 nm and Re / Rth ratio was 0.771.

Oriented film 2
By changing the thickness of the unstretched film, a uniaxially oriented oriented film 2 was obtained in the same manner as the oriented film 1 except that the thickness of the film was about 80 μm. The retardation value was 8300 nm. Rth was 10700 nm and the Re / Rth ratio was 0.776.

Oriented film 3
By changing the thickness of the unstretched film, a uniaxially oriented alignment film 3 was obtained in the same manner as the alignment film 1 except that the thickness of the film was about 50 μm. The retardation value was 5200 nm. Rth was 6600 nm and Re / Rth ratio was 0.788.

Oriented film 4
The unstretched film is heated to 105 ° C. using a heated roll group and an infrared heater, and then stretched 2.0 times in the running direction by a roll group having a difference in peripheral speed, and then in the same manner as the oriented film 1. A biaxially oriented oriented film 4 having a film thickness of about 50 μm was obtained in the same manner as the oriented film 1 except that the film was stretched 4.0 times in the width direction. The retardation value was 3200 nm. Rth was 7340 nm and Re / Rth ratio was 0.436.

The retardation (Re) of the oriented film was measured as follows. That is, using two polarizing plates, the orientation principal axis direction of the film was obtained, and a 4 cm × 2 cm rectangle was cut out so that the orientation principal axis directions were orthogonal to each other, and used as a measurement sample. With respect to this sample, the biaxial refractive index (Nx, Ny) perpendicular to each other and the refractive index (Nz) in the thickness direction were determined with an Abbe refractometer (NAR-4T, manufactured by Atago Co., Ltd.) at a wavelength of 589 nm. The absolute value (| Nx−Ny |) of the refractive index difference of the shaft was determined as the anisotropy (ΔNxy) of the refractive index. The thickness d (nm) of the film was measured using an electric micrometer (manufactured by Fine Reef, Millitron 1245D), and the unit was converted to nm. Retardation (Re) was determined from the product (ΔNxy × d) of refractive index anisotropy (ΔNxy) and film thickness d (nm).

Further, Nx, Ny, Nz and film thickness d (nm) are obtained by the same method as the measurement of retardation, and the average value of (ΔNxz × d) and (ΔNyz × d) is calculated to obtain a thickness direction retardation ( Rth) was determined.

<Preparation of transparent resin molding>
As the resin, polycarbonate resin “Caliber 301-10” manufactured by Sumitomo Dow Co., Ltd. having a heat distortion temperature of 140 ° C. was used. This resin was melt-kneaded with an extruder and fed in the order of a feed block and a die. Then, the molten resin extruded from the die was sandwiched between the first cooling roll and the second cooling roll arranged opposite to each other, and molded and cooled to obtain a single-layer resin plate having a thickness of 0.5 mm. . This was used for production of a laminated glass plate as a transparent resin molding.

The retardation (Re) of the transparent resin molded body was measured for the retardation value at a wavelength of 589 nm using KOBRA (21ADH, manufactured by Oji Scientific Instruments).

<Production of laminated glass plate>
The oriented film 1, 2, 3 or 4 was bonded to one surface of the transparent resin molded body via an adhesive to prepare a resin laminate. Next, the glass plate (thickness 5 mm) was laminated | stacked through the adhesive on the surface side by which the oriented film of the resin laminated body was laminated | stacked, and the laminated glass was produced. As a comparison object, a laminated glass in which a glass plate was directly laminated on a transparent resin molded body without using an oriented film was produced.

<Color Spot Evaluation Test A>
A natural light LED (CCS, natural light LED EXLN-NW022050E11JW) is placed on one side of the plane of the laminated glass plate as an alternative to sunlight, and the surface of the laminated glass plate is It observed from the diagonal direction and evaluated according to the following evaluation criteria. The laminated glass plate was disposed so that the glass plate was closer to the viewing side than the transparent resin molded body.

<Evaluation criteria>
A: Color spots are not observed.
○: Light color spots are observed, but there is no problem in visibility.
X: A clear color spot is observed.

Evaluation results are shown in Table 1 below.

As shown in Table 1, clear color spots were observed in the laminated glass on which the oriented film was not laminated, but the color spots could be eliminated by laminating any of the oriented films 1 to 4. confirmed. Moreover, when the oriented film 1 or 2 was used, it was confirmed that a color spot is eliminated more notably.

<Color Spot Evaluation Test B>
The glass surface of the laminated glass plate is irradiated with natural light LED (natural light LED EXLN-NW022050E11JW) as an alternative to sunlight from an angle of 45 degrees with respect to the normal direction of the glass surface. Similar to the color spot evaluation test 1 except that the surface of the laminated glass plate was observed from the front side and the oblique direction from the same side as the side where the natural light LED was arranged with respect to the plane of the laminated glass plate in a state reflected by the surface. Evaluated.

Evaluation results are shown in Table 2 below.

As shown in Table 2, it was confirmed that rainbow spots were observed even when sunlight was incident on the glass surface of the laminated glass from an oblique direction, and in the case of laminated glass on which no oriented film was laminated. On the other hand, it was confirmed that the color spots were eliminated by laminating any one of the oriented films 1 to 4. Moreover, when the oriented film 1 or 2 was used, it was confirmed that a color spot is eliminated more notably.

The laminated glass sheet can be suitably used, for example, for window materials for general buildings and high-rise buildings, lighting from the roof, covering materials for greenhouses for agriculture, and window materials for vehicles such as automobiles and trains. .

Claims

An oriented film having a retardation of 3000 to 150,000 nm,
Transparent resin molded body and glass plate,
A laminated glass plate laminated.
The laminated glass plate according to claim 1, wherein the transparent resin molded body is formed of at least one resin selected from the group consisting of an acrylic resin and a polycarbonate resin.
The laminated glass plate according to claim 1 or 2, wherein the oriented film is a polyester film.
The laminated glass sheet according to any one of claims 1 to 3, which is used for building materials.
The laminated glass sheet according to any one of claims 1 to 3, which is used for vehicles.
An oriented film having a retardation of 3000 to 150,000 nm,
Transparent resin molded body and glass plate,
Laminated window glass.