JP2015196617A - Interlayer film for glass laminate, the glass laminate, and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interlayer film for a glass laminate that can display an image of high contrast by irradiation with a beam and that can prevent the leakage of the beam to the outside, and to provide the glass laminate in which the interlayer film for the glass laminate is used, and a display device using the glass laminate.SOLUTION: There is provided an interlayer film for a glass laminate comprising a luminous layer that comprises a polyvinyl acetal, a plasticizer and a luminescent material, and a light absorption layer that comprises a polyvinyl acetal, a plasticizer and a light absorber. In the interlayer film for the glass laminate, the light absorber absorbs a light beam of a wavelength that excites the luminescent material.

Description

The present invention provides an interlayer film for laminated glass capable of displaying an image with high contrast by being irradiated with light and preventing the light from leaking to the outside, and a laminate using the interlayer film for laminated glass The present invention relates to glass and a display device using the laminated glass.

Laminated glass is safe because it does not scatter glass fragments even if it is damaged by an external impact, so it can be used as a windshield, side glass, rear glass for vehicles such as automobiles, and window glass for aircraft, buildings, etc. Widely used. Examples of the laminated glass include a laminated glass obtained by integrating an interlayer film for laminated glass including a liquid plasticizer and a polyvinyl acetal resin between at least a pair of glasses.

2. Description of the Related Art In recent years, there has been a growing demand for a windshield for an automobile to display an instrument display such as speed information, which is automobile travel data, as a head-up display (HUD) within the same field of view as the windshield.
A number of forms have been developed as HUDs so far. By reflecting the speed information transmitted from the control unit as the most common HUD to the windshield from the display unit of the instrument panel, the driver can obtain the speed information at the same position as the windshield, that is, within the same field of view. There is a HUD that can be visually recognized.
As an interlayer film for laminated glass for HUD, for example, Patent Document 1 proposes an interlayer film for wedge-shaped laminated glass having a predetermined wedge angle, and HUD's that the instrument display looks double in laminated glass. It has been proposed to solve the drawbacks.

If the laminated glass described in patent document 1 is a partial area | region in the surface of a laminated glass, the fault of HUD that an instrument display looks double can be solved. That is, the problem that the instrument display appears double on the entire surface of the laminated glass has not been solved.
Patent Document 2 discloses a laminated glass in which an intermediate layer containing hydroxyterephthalate is laminated between two transparent plates. The laminated glass described in Patent Document 2 can display an image with high contrast when irradiated with light.

JP 2002-1000079 A International Publication No. 2010/139889 Pamphlet

The present inventors examined an interlayer film for laminated glass having a light emitting layer containing polyvinyl acetal, a plasticizer, and a light emitting material. It was confirmed that an image having a high contrast can be displayed by irradiating a laminated glass using such an interlayer film for laminated glass with a light beam having a wavelength that excites the light emitting material.
However, there has been a problem that the light irradiated to display an image passes through the laminated glass and leaks to the outside. When laminated glass is used as a windshield for automobiles, if the light emitted from the inside leaks outside the car, not only will there be a problem on the landscape, but it will be dangerous if the driver of the oncoming vehicle is exposed to the light. There was a problem.

The present invention provides an interlayer film for laminated glass capable of displaying an image with high contrast by being irradiated with light and preventing the light from leaking to the outside, and a laminate using the interlayer film for laminated glass It is an object of the present invention to provide glass and a display device using the laminated glass.

The present invention is an interlayer film for laminated glass having a light emitting layer containing polyvinyl acetal, a plasticizer and a light emitting material, and a light absorbing layer containing polyvinyl acetal, a plasticizer and a light absorber, wherein the light absorber is An interlayer film for laminated glass that absorbs light having a wavelength that excites the light emitting material.
The present invention is described in detail below.

As a result of intensive studies, the present inventors have prevented the light from leaking outside by laminating a light-absorbing layer that absorbs light having a wavelength that excites the light-emitting material on the light-emitting layer containing the light-emitting material. As a result, the present invention was completed.
When the laminated glass using the interlayer film for laminated glass having the light emitting layer and the light absorbing layer is used as an automotive windshield, the light emitting layer is disposed on the vehicle interior side and the light absorbing layer is disposed on the vehicle exterior side. . In such an arrangement, when light is irradiated from the vehicle interior toward the laminated glass, the light emitting material emits light and an image with high contrast can be displayed. On the other hand, since the light beam transmitted through the light emitting layer is absorbed by the light absorption layer, the light beam hardly leaks out of the vehicle.

The interlayer film for laminated glass of the present invention has a light emitting layer containing polyvinyl acetal, a plasticizer, and a light emitting material.
The polyvinyl acetal is not particularly limited as long as it is a polyvinyl acetal obtained by acetalizing polyvinyl alcohol with an aldehyde, but polyvinyl butyral is preferable. Moreover, you may use together 2 or more types of polyvinyl acetal as needed.
The preferable lower limit of the degree of acetalization of the polyvinyl acetal is 40 mol%, the preferable upper limit is 85 mol%, the more preferable lower limit is 60 mol%, and the more preferable upper limit is 75 mol%.

The polyvinyl acetal has a preferred lower limit of the hydroxyl group content of 15 mol% and a preferred upper limit of 35 mol%. When the hydroxyl group amount is 15 mol% or more, the interlayer film for laminated glass can be easily molded. When the hydroxyl group amount is 35 mol% or less, handling of the interlayer film for laminated glass becomes easy.
The degree of acetalization and the amount of hydroxyl groups can be measured in accordance with, for example, JIS K6728 “Testing method for polyvinyl butyral”.

The polyvinyl acetal can be prepared by acetalizing polyvinyl alcohol with an aldehyde. The polyvinyl alcohol is usually obtained by saponifying polyvinyl acetate, and polyvinyl alcohol having a saponification degree of 70 to 99.8 mol% is generally used.
The preferable lower limit of the polymerization degree of the polyvinyl alcohol is 500, and the preferable upper limit is 4000. When the polymerization degree of the polyvinyl alcohol is 500 or more, the penetration resistance of the obtained laminated glass is increased. When the polymerization degree of the polyvinyl alcohol is 4000 or less, the interlayer film for laminated glass can be easily molded. The minimum with a more preferable polymerization degree of the said polyvinyl alcohol is 1000, and a more preferable upper limit is 3600.

The aldehyde is not particularly limited, but generally an aldehyde having 1 to 10 carbon atoms is preferably used. The aldehyde having 1 to 10 carbon atoms is not particularly limited. For example, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexylaldehyde, n-octylaldehyde, n-nonylaldehyde N-decylaldehyde, formaldehyde, acetaldehyde, benzaldehyde and the like. Of these, n-butyraldehyde, n-hexylaldehyde, and n-valeraldehyde are preferable, and n-butyraldehyde is more preferable. These aldehydes may be used alone or in combination of two or more.

The light emitting layer contains a plasticizer. The plasticizer is not particularly limited, and examples thereof include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic phosphorous acid plasticizers, and the like. Is mentioned. The plasticizer is preferably a liquid plasticizer.

The monobasic organic acid ester is not particularly limited. For example, glycols such as triethylene glycol, tetraethylene glycol, and tripropylene glycol, butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptylic acid, and n-octyl Examples thereof include glycol esters obtained by reaction with monobasic organic acids such as acid, 2-ethylhexyl acid, pelargonic acid (n-nonyl acid), and decyl acid. Of these, triethylene glycol dicaproate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-n-octylate, triethylene glycol di-2-ethylhexylate and the like are preferable.

Although the said polybasic organic acid ester is not specifically limited, For example, ester compound of polybasic organic acid, such as adipic acid, sebacic acid, azelaic acid, and the alcohol which has a C4-C8 linear or branched structure Is mentioned. Of these, dibutyl sebacic acid ester, dioctyl azelaic acid ester, dibutyl carbitol adipic acid ester and the like are preferable.

The organic ester plasticizer is not particularly limited, and triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, triethylene glycol di-n-octanoate, Triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, tetraethylene glycol di-2-ethylhexanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethyl Butyrate, 1,3-propylene glycol di-2-ethyl butyrate, 1,4-butylene glycol di-2-ethyl butyrate, diethylene glycol di-2-ethyl butyrate, diethylene glycol di- -Ethyl hexanoate, dipropylene glycol di-2-ethyl butyrate, triethylene glycol di-2-ethyl pentanoate, tetraethylene glycol di-2-ethyl butyrate, diethylene glycol dicapryate, dihexyl adipate, adipine Dioctyl acid, hexyl cyclohexyl adipate, diisononyl adipate, heptylnonyl adipate, dibutyl sebacate, oil-modified sebacic acid alkyd, a mixture of phosphate ester and adipic acid ester, adipic acid ester, alkyl alcohol having 4 to 9 carbon atoms and Examples thereof include mixed adipic acid esters prepared from cyclic alcohols having 4 to 9 carbon atoms and adipic acid esters having 6 to 8 carbon atoms such as hexyl adipate.

The organophosphate plasticizer is not particularly limited, and examples thereof include tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphate, and the like.

Among the above plasticizers, dihexyl adipate (DHA), triethylene glycol di-2-ethylhexanoate (3GO), tetraethylene glycol di-2-ethylhexanoate (4GO), triethylene glycol di-2- Selected from the group consisting of ethyl butyrate (3GH), tetraethylene glycol di-2-ethylbutyrate (4GH), tetraethylene glycol di-n-heptanoate (4G7) and triethylene glycol di-n-heptanoate (3G7) It is preferable that it is at least one kind.

Furthermore, since it is difficult to cause hydrolysis as the plasticizer, triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH), tetraethylene glycol di-2- It preferably contains ethyl hexanoate (4GO) and dihexyl adipate (DHA), and tetraethylene glycol di-2-ethylhexanoate (4GO) and triethylene glycol di-2-ethylhexanoate (3GO). More preferably, it contains triethylene glycol di-2-ethylhexanoate, and even more preferably.

The content of the plasticizer in the light emitting layer is not particularly limited, but a preferable lower limit with respect to 100 parts by weight of the polyvinyl acetal is 20 parts by weight, and a preferable upper limit is 80 parts by weight. When the content of the plasticizer is 20 parts by weight or more, the melt viscosity of the interlayer film for laminated glass becomes low, so that the interlayer film for laminated glass can be easily formed. When the content of the plasticizer is 80 parts by weight or less, the transparency of the interlayer film for laminated glass increases. The more preferred lower limit of the plasticizer content is 30 parts by weight, the more preferred upper limit is 70 parts by weight, the still more preferred lower limit is 35 parts by weight, and the still more preferred upper limit is 63 parts by weight.

The light emitting layer contains a light emitting material.
Examples of the light emitting material include a blue light emitting material, a green light emitting material, and a red light emitting material.
In this specification, a blue light emitting material means a material that emits light in a wavelength region of 380 nm or more and less than 495 nm by irradiating light with an excitation wavelength, and a green light emitting material means light having an excitation wavelength. It means that emits light in the wavelength range of 495 nm or more and less than 590 nm when irradiated, and the red light emitting material emits light in the wavelength range of 590 nm or more and 750 nm or less by irradiating light of excitation wavelength. Means what to do.

Examples of the blue light emitting material include naphthalimide materials (for example, “Violet 570” manufactured by BASF, excitation wavelength 405 nm), 4,4′-bis (2-benzoxazolyl) stilbene (manufactured by Central Techno Co., Ltd.) B-800 ", excitation wavelength 405 nm), diethyl 2,5-dihydroxyterephthalate (manufactured by Aldrich, excitation wavelength, excitation wavelength 405 nm), tris (3,4,7,8-tetramethyl-1,10-phenant Lorinato) iridium (III) (excitation wavelength 405 nm), tris (2,9-dimethyl-4,7-diphenyl-1,10-phenanthrolinato) iridium (III) hexafluorophosphate trisalt (excitation wavelength 405 nm).

Examples of the green light emitting material include 2- (3-oxoindoline-1-ylidene) methylquinoline (“G-3300” manufactured by Central Techno Co., Ltd., excitation wavelength: 380 nm), tris (trifluoroacetylacetonato) terbium (III ) (Excitation wavelength: 380 nm), tris (trifluoroacetylacetonate) mono (1,10-phenanthrolinato) terbium (III) (excitation wavelength: 380 nm), and the like.

The red light emitting material is, for example, tris (4,4,4-trifluoro-1- (2-thienyl) -1,3-butanedionate-O, O ′) bis (triphenylphosphine oxide-O— ) Europium (Central Techno Co., Ltd., excitation wavelength: 340 nm), tris [4,4,4-trifluoro-1- (2-thienyl) -1,3-butanedionato-0,0 ′] (benzoic acid) europium ( Manufactured by Central Techno Co., Ltd., excitation wavelength 340 nm), tris [1,1,5,5,5-hexafluoro-1,3-pentanedionato-0,0 ′] bis (triphenylphosphine oxide-O—) europium (Central Manufactured by Techno, excitation wavelength 340 nm), tris (trifluoroacetylacetonato) mono (1,10-phenanthrolinato) europium (I I) (excitation wavelength 340 nm), tris (hexafluoroacetylacetonate) mono (1,10-phenanthrolinyl diisocyanate) europium (III) (excitation wavelength 340 nm), and the like.

The interlayer film for laminated glass of the present invention preferably has a plurality of light emitting layers containing any one of the blue light emitting material, the green light emitting material, and the red light emitting material. That is, a light emitting layer containing a blue light emitting material (hereinafter also referred to as “blue light emitting layer”), a light emitting layer containing a green light emitting material (hereinafter also referred to as “green light emitting layer”), and It is preferable to have at least two light emitting layers selected from the group consisting of a light emitting layer containing a red light emitting material (hereinafter also referred to as “red light emitting layer”). Thereby, it is possible to display a multicolor image instead of a single color.

The minimum with preferable content of the luminescent material with respect to 100 weight part of said polyvinyl acetals in the said light emitting layer is 0.001 weight part, and a preferable upper limit is 10 weight part. When the content of the light emitting material is 0.001 part by weight or more, an image with much higher contrast can be displayed by irradiation with light. When the content of the light emitting material is 10 parts by weight or less, the transparency of the interlayer film for laminated glass is further enhanced. The minimum with more preferable content of the said luminescent material is 0.01 weight part, and a more preferable upper limit is 2 weight part.

The light emitting layer preferably further contains a dispersant. By containing the dispersant, aggregation of the light emitting material can be suppressed, and more uniform light emission can be obtained.
The dispersant is, for example, a compound having a sulfonic acid structure such as a linear alkylbenzene sulfonate, or an ester structure such as a diester compound, a ricinoleic acid alkyl ester, a phthalic acid ester, an adipic acid ester, a sebacic acid ester, or a phosphoric acid ester. , Compounds having an ether structure such as polyoxyethylene glycol, polyoxypropylene glycol and alkylphenyl-polyoxyethylene-ether, compounds having a carboxylic acid structure such as polycarboxylic acid, laurylamine, dimethyllauryl Compounds having an amine structure such as amines, oleylpropylenediamine, secondary amines of polyoxyethylene, tertiary amines of polyoxyethylene, and diamines of polyoxyethylene, and polyalkylenepolyaminealkyleneoxy Dispersants such as compounds having a polyamine structure such as amides, compounds having an amide structure such as oleic acid diethanolamide and alkanol fatty acid amide, and compounds having a high molecular weight amide structure such as polyvinylpyrrolidone and polyester acid amide amine salts Can be used. Moreover, you may use high molecular weight dispersing agents, such as polyoxyethylene alkyl ether phosphoric acid (salt), high molecular polycarboxylic acid, and condensed ricinoleic acid ester. The high molecular weight dispersant is defined as a dispersant having a molecular weight of 10,000 or more.

When the dispersing agent is blended, the preferable lower limit of the content of the dispersing agent with respect to the total of 100 parts by weight of the light emitting material in the light emitting layer is 1 part by weight, and the preferable upper limit is 50 parts by weight. When the content of the dispersant is within this range, the light emitting material can be uniformly dispersed in the light emitting layer. The more preferable lower limit of the content of the dispersant is 3 parts by weight, the more preferable upper limit is 30 parts by weight, the still more preferable lower limit is 5 parts by weight, and the still more preferable upper limit is 25 parts by weight.

The light emitting layer preferably further contains an antioxidant. When the light emitting layer contains an antioxidant, excellent light resistance can be exhibited.
Examples of the antioxidant include an antioxidant having a phenol structure, an antioxidant containing sulfur, and an antioxidant containing phosphorus.
Examples of the antioxidant having the phenol structure include 2,6-di-t-butyl-p-cresol (BHT), butylated hydroxyanisole (BHA), 2,6-di-t-butyl-4-ethyl. Phenol, stearyl-β- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 2,2′-methylenebis- (4-methyl-6-butylphenol), 2,2′-methylenebis- (4 -Ethyl-6-t-butylphenol), 4,4'-butylidene-bis- (3-methyl-6-t-butylphenol), 1,1,3-tris- (2-methyl-hydroxy-5-t- Butylphenyl) butane, tetrakis [methylene-3- (3 ′, 5′-butyl-4-hydroxyphenyl) propionate] methane, 1,3,3-tris- (2-methyl-4) -Hydroxy-5-t-butylphenol) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, and bis (3,3 '-T-butylphenol) butyric acid glycol ester and pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and the like. The said antioxidant may be used independently and may use 2 or more types together.

The light emitting layer may contain additives such as an adhesive strength adjusting agent, a light stabilizer, an antistatic agent, a blue pigment, a blue dye, a green pigment, and a green dye as necessary.

The preferable lower limit of the thickness of the light emitting layer is 300 μm, and the preferable upper limit is 2000 μm. When the thickness of the light emitting layer is within this range, light emission with sufficiently high contrast can be obtained when a light beam having a specific wavelength is irradiated. The more preferable lower limit of the thickness of the light emitting layer is 350 μm, and the more preferable upper limit is 1000 μm.

The light emitting layer may be disposed on the entire surface of the interlayer film for laminated glass, or may be disposed on only a part thereof, and disposed on the entire surface in a plane direction perpendicular to the thickness direction of the interlayer film for laminated glass. It may be arranged only in part. In the case where the light emitting layer is arranged only in part, information can be displayed only in the light emitting area, with the part as a light emitting area and the other part as a non-light emitting area.

The interlayer film for laminated glass of the present invention has a light absorption layer containing polyvinyl acetal, a plasticizer, and a light absorber. By laminating such a light absorbing layer, it is possible to prevent the light beam irradiated toward the light emitting layer from leaking out.

As the polyvinyl acetal, the plasticizer and other additives used for the light absorption layer, the same materials as those used for the light emitting material can be used. In addition, about the kind and compounding quantity of polyvinyl acetal, a plasticizer, and another additive, it may be the same as the said luminescent material, and may differ.

The light absorbing agent absorbs light having a wavelength that excites the light emitting material, and is appropriately selected according to the light emitting material.
Examples of the light absorber include a compound having a malonic ester structure, a compound having an oxalic acid anilide structure, a compound having a benzotriazole structure, a compound having a benzophenone structure, a compound having a triazine structure, a compound having a benzoate structure, and a hindered amine Known ultraviolet shielding agents such as compounds having a structure can be used. More specifically, Tinuvin 312 (manufactured by BASF, mainly absorbing light at 250 to 350 nm), Tinuvin 326 (manufactured by BASF, mainly absorbing light at 300 to 405 nm), Tinuvin 460 (manufactured by BASF, mainly 280 to 350 nm) Absorption of light at 370 nm).

The minimum with preferable content of the said light absorber with respect to 100 weight part of said polyvinyl acetals in the said light absorption layer is 0.001 weight part, and a preferable upper limit is 10 weight part. Within this range, it is possible to achieve both prevention of light leakage and high transparency. The minimum with more preferable content of the said light absorber is 0.05 weight part, and a more preferable upper limit is 1 weight part.

When the interlayer film for laminated glass of the present invention has at least two light emitting layers selected from the group consisting of a blue light emitting layer, a green light emitting layer, and a red light emitting layer, the at least two kinds of light emitting layers are used. Corresponding to the light emitting layer, it is preferable to have a plurality of light absorbing layers containing a light absorbing agent that absorbs light having a wavelength that excites the light emitting material contained in each light emitting layer. That is, a light absorbing layer containing a light absorber that absorbs light having a wavelength for exciting the blue light emitting material (hereinafter also referred to as “light absorbing layer for blue light emitting layer”), a wavelength for exciting the green light emitting material. A light absorbing layer containing a light absorbing agent that absorbs light (hereinafter also referred to as “light absorbing layer for green light emitting layer”), and a light absorbing agent that absorbs light having a wavelength that excites a red light emitting material. It is preferable to have at least two types of light absorbing layers selected from the group consisting of a light absorbing layer containing benzene (hereinafter also referred to as “light absorbing layer for red light emitting layer”). Thereby, it is possible to prevent light from leaking to the outside while performing multicolor image display.

The interlayer film for laminated glass of the present invention has at least two light emitting layers selected from the group consisting of a blue light emitting layer, a green light emitting layer, and a red light emitting layer, and the at least two kinds Corresponding to the light emitting layer, at least two light absorbing layers selected from the group consisting of a light absorbing layer for a blue light emitting layer, a light absorbing layer for a green light emitting layer, and a light absorbing layer for a red light emitting layer are provided. When it has, it is preferable that the corresponding light emitting layer and light absorption layer are laminated | stacked directly. That is, for example, blue light emitting layer / light emitting layer for blue light emitting layer / green light emitting layer / light absorbing layer for green light emitting layer / red light emitting layer / light absorbing layer for red light emitting layer are laminated in this order. Preferably it is. For example, when a laminated glass including an interlayer film for laminated glass having such a structure is irradiated with light having a wavelength that excites the blue light-emitting material from the blue light-emitting layer side, the blue light-emitting material emits light and emits a blue image. On the other hand, since the light transmitted through the blue light emitting layer is absorbed by the light absorbing layer for blue light emitting layer, it hardly reaches the next green light emitting layer. Accordingly, the green light-emitting layer is not erroneously excited by the light beam having a wavelength for exciting the blue light-emitting material, and a desired color image can be displayed and the color development can be prevented from becoming cloudy. .

The interlayer film for laminated glass of the present invention may have, in addition to the light emitting layer and the light absorbing layer, a resin layer that exhibits other functions, such as a heat ray absorbing layer and a sound insulating layer.

The laminated glass in which the interlayer film for laminated glass of the present invention is laminated between a pair of glass plates is also one aspect of the present invention.
The said glass plate can use the transparent plate glass generally used. Examples thereof include inorganic glass such as float plate glass, polished plate glass, template glass, netted glass, wire-containing plate glass, colored plate glass, heat ray absorbing glass, heat ray reflecting glass, and green glass. Moreover, although the ultraviolet shielding glass in which the ultraviolet shielding coating layer was formed in the glass surface can be used, it is preferable to use as a glass plate opposite to the side irradiated with the light ray of a specific wavelength. Furthermore, organic glass plates such as polyethylene terephthalate, polycarbonate, and polyacrylate can be used as the glass plate.
Two or more types of glass plates may be used as the glass plate. For example, the laminated glass which laminated | stacked the intermediate film for laminated glasses of this invention between transparent float plate glass and colored glass plates like green glass is mentioned. Moreover, you may use the glass plate from which 2 or more types of thickness differs as said glass plate.

The laminated glass of the present invention can display a corresponding color by irradiating light having an excitation wavelength of the light emitting material, and when it has at least two kinds of light emitting layers, it can emit light having a plurality of wavelengths. Multi-color images can be displayed by irradiation in combination.
The apparatus for irradiating the light having the excitation wavelength of the luminescent material is preferably a laser type concentrated light (laser light) generator. By using such a laser beam generator, an image with higher contrast can be displayed.
A display device that includes the laminated glass of the present invention and one or more laser beam generators and displays an image by irradiating the laminated glass with the laser beam from the laser beam generator is also 1 of the present invention. One.

The laser beam generator preferably includes at least one laser diode capable of irradiating an ultraviolet laser beam having a wavelength of less than 410 nm.
The laser beam generator preferably has a laser beam illuminance adjusting means. Thereby, the brightness | luminance of the multicolor image to display can be adjusted according to external conditions, such as day and night.

The laser beam generator includes, for example, a spot light source (for example, “LC-8” manufactured by Hamamatsu Photonics), a xenon flash lamp (for example, “CW lamp” manufactured by Heraeus Co., Ltd. and “REX-250” manufactured by Asahi Spectroscopic Co., Ltd.), Black light (for example, “Carry Hand” manufactured by Inoue Seieido Co., Ltd.) and the like.

According to the present invention, an interlayer film for laminated glass that can display an image with high contrast by being irradiated with light and can prevent the light from leaking to the outside, and the interlayer film for laminated glass are used. A laminated glass and a display device using the laminated glass can be provided.

Hereinafter, embodiments of the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

(Example 1)
(1) Preparation of red light emitting layer Polyvinyl butyral obtained by acetalizing polyvinyl alcohol having a polymerization degree of 1700 with n-butyraldehyde (acetyl group content 0.9 mol%, hydroxyl group content 30.6 mol%) , Butyralization degree 68.5 mol%) 100 parts by weight, triethylene glycol di-2-ethylhexanoate (3GO) 40 parts by weight, red light emitting material tris (4,4,4-trifluoro- 1- (2-thienyl) -1,3-butanedionate-O, O ′) bis (triphenylphosphine oxide-O—) europium) (manufactured by Central Techno Co., Ltd.) 0.2 parts by weight, and antioxidant 0.20 part by weight of H-BHT (manufactured by Sakai Chemical Industry Co., Ltd.) was added as an agent, and the mixture was sufficiently kneaded with a mixing roll to obtain a red light emitting layer composition.
The resulting red light emitting layer composition was extruded using an extruder to obtain a single layer resin film having an average thickness of 0.38 mm.

(2) Preparation of light-absorbing layer for red light-emitting layer Polyvinyl butyral obtained by acetalizing polyvinyl alcohol having a polymerization degree of 1700 with n-butyraldehyde (acetyl group content: 0.9 mol%, hydroxyl group content: 30) .6 mol%, butyralization degree 68.5 mol%) to 100 parts by weight, triethylene glycol di-2-ethylhexanoate (3GO) 40 parts by weight, Tinuvin 312 (manufactured by BASF) as a light absorber 0. 2 parts by weight and 0.20 part by weight of H-BHT (manufactured by Sakai Chemical Industry Co., Ltd.) as an antioxidant were added, and kneaded thoroughly with a mixing roll to obtain a light-absorbing layer composition for a red light emitting layer.
The obtained light absorbing layer for red light emitting layer was extruded with an extruder to obtain a single layer resin film having an average thickness of 0.38 mm.

(3) Two types of laminated resin films obtained by laminating glass are stacked and sandwiched between two transparent float glass panes with an area of 50 mm x 50 mm and a thickness of 2.5 mm so as not to be displaced using a heat-resistant tape. The laminate was obtained by fixing. The obtained laminate was placed in a vacuum bag, and the vacuum bag was degassed at a reduced pressure of 933.2 hPa at room temperature. Subsequently, while maintaining the deaerated state, the vacuum bag was heated to 100 ° C., and held for 20 minutes after the temperature reached 100 ° C. Thereafter, the vacuum bag was cooled by natural cooling, and after confirming that the temperature had dropped to 30 ° C., the pressure was released to atmospheric pressure.
The laminated glass temporarily pressure-bonded by the vacuum bag method was pressure-bonded for 20 minutes under the conditions of 135 ° C. and pressure 1.2 MPa using an autoclave to obtain a laminated glass.

(Examples 2-6, Comparative Example 1)
An interlayer film for laminated glass and a laminated glass were obtained in the same manner as in Example 1 except that the luminescent material and the light absorber were changed as shown in Table 1. In Table 1, naphthalimide-based material (“Violet 570” manufactured by BASF) is used as a blue-based luminescent material, and 2- (3-oxoindoline-1-ylidene) methylquinoline (“G” manufactured by Central Techno Co., Ltd.) is used as a green-based luminescent material. -3300 ").
In Table 1, the display of components other than the light emitting material and the light absorber is omitted, and the stacking order of each layer is indicated by numbers 1 to 3 in order from the top.

(Evaluation)
The obtained laminated glass was evaluated by the following method. The results are shown in Table 1.

(1) Measurement of visible light transmittance About the obtained laminated glass, a 300-2500 nm transmittance | permeability is measured using a self-recording spectrophotometer ("U4100" made by Hitachi, Ltd.), and it conforms to JIS R 3211 (1998). The visible light transmittance at 380 to 780 nm was calculated.

(2) Evaluation of image display Table 1 shows a high power xenon light source ("REX-250" manufactured by Asahi Spectroscopic Co., Ltd.) placed at a position 10 cm away from the surface of the laminated glass in the dark direction in a dark room. Luminance meter ("SR-3AR" manufactured by Topcon Technohouse Co., Ltd.) placed at a position 35 cm away from the surface of the laminated glass irradiated with the light with a laser beam of each wavelength. ) To measure the emission wavelength and evaluate the color development.

(3) Evaluation of light leakage Using a self-recording spectrophotometer ("U4100" manufactured by Hitachi, Ltd.), the light transmittance at the irradiation wavelength of the laminated glass was measured. Example 1 is the transmittance of light having an irradiation wavelength of 340 nm, Example 2 is the transmittance of light having an irradiation wavelength of 380 nm, Example 3 is the transmittance of light having an irradiation wavelength of 405 nm, and Example 4 is a light having irradiation wavelengths of 340 nm and 405 nm. Example 5 is the maximum value of the transmittance of the light with the irradiation wavelengths of 380 nm and 405 nm, Example 6 is the maximum value of the transmittance of the light with the irradiation wavelengths of 340 nm, 380 nm and 405 nm, and the comparative example 1 is the irradiation The transmittance of light having a wavelength of 340 nm was measured.

According to the present invention, an interlayer film for laminated glass that can display an image with high contrast by being irradiated with light and can prevent the light from leaking to the outside, and the interlayer film for laminated glass are used. A laminated glass and a display device using the laminated glass can be provided.

Claims (7)

An interlayer film for laminated glass having a light emitting layer containing polyvinyl acetal, a plasticizer and a light emitting material, and a light absorbing layer containing polyvinyl acetal, a plasticizer and a light absorber,
The interlayer film for laminated glass, wherein the light absorber absorbs light having a wavelength that excites the light emitting material. Having at least two light emitting layers selected from the group consisting of a light emitting layer containing a blue light emitting material, a light emitting layer containing a green light emitting material, and a light emitting layer containing a red light emitting material, and Corresponding to the at least two kinds of light emitting layers, a light absorbing layer containing a light absorber that absorbs light having a wavelength for exciting the blue light emitting material, and absorbing light having a wavelength for exciting the green light emitting material. A light absorbing layer containing a light absorbing agent and at least two light absorbing layers selected from the group consisting of a light absorbing layer containing a light absorbing agent that absorbs light having a wavelength that excites the red light emitting material. The interlayer film for laminated glass according to claim 1, comprising: The interlayer film for laminated glass according to claim 2, wherein the corresponding light emitting layer and light absorbing layer are directly laminated. 4. The interlayer film for laminated glass according to claim 1, wherein the content of the light emitting material is 0.001 to 10 parts by weight with respect to 100 parts by weight of the polyvinyl acetal in the light emitting layer. 5. The interlayer film for laminated glass according to claim 1, wherein the content of the light absorber is 0.001 to 10 parts by weight with respect to 100 parts by weight of the polyvinyl acetal in the light absorption layer. A laminated glass, wherein the interlayer film for laminated glass according to claim 1, 2, 3, 4 or 5 is laminated on a pair of glass plates. It has the laminated glass according to claim 6 and one or more laser beam generators, and displays an image by irradiating a laser beam from the laser beam generator toward the laminated glass. Display device.