WO2020189780A1 - 合わせガラス用中間膜、及び合わせガラス - Google Patents
合わせガラス用中間膜、及び合わせガラス Download PDFInfo
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- WO2020189780A1 WO2020189780A1 PCT/JP2020/012500 JP2020012500W WO2020189780A1 WO 2020189780 A1 WO2020189780 A1 WO 2020189780A1 JP 2020012500 W JP2020012500 W JP 2020012500W WO 2020189780 A1 WO2020189780 A1 WO 2020189780A1
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- Prior art keywords
- thermoplastic resin
- laminated glass
- resin layer
- optical functional
- functional layer
- Prior art date
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- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10678—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer comprising UV absorbers or stabilizers, e.g. antioxidants
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Definitions
- the present invention relates to a laminated glass interlayer film having an optical functional layer and a laminated glass provided with the laminated glass interlayer film.
- laminated glass in which an interlayer film is interposed between two glass plates and integrated is widely known.
- the interlayer film is often formed of a plasticized polyvinyl acetal in which a plasticizer is mixed with a polyvinyl acetal resin.
- Laminated glass is widely used as window glass for vehicles such as automobiles, aircraft, and buildings because it is safe because glass fragments are less likely to scatter even if it is damaged by an external impact.
- a head-up display (HUD) that displays information necessary for driving may be applied to the windshield of automobiles, aircraft, etc. within the same field of view as the windshield.
- a widely known HUD is one in which the light from a projector provided on an instrument panel or the like is reflected by a windshield made of laminated glass so that the driver can see it.
- Patent Document 1 discloses that a relief type hologram is arranged between two glass plates constituting a laminated glass.
- Patent Document 2 discloses a hologram-encapsulated laminated glass having a structure in which a glass plate, a hologram, a hologram coating layer, and a synthetic resin film are laminated in this order.
- Patent Document 1 in order to prevent the relief type hologram from being deteriorated by ultraviolet rays, an ultraviolet absorbing layer is provided between the two glass plates, and the relief type hologram is arranged inside the vehicle rather than the ultraviolet absorbing layer. ing. Further, also in Patent Document 2, the synthetic resin film has an ultraviolet absorbing ability, and it is prevented that the hologram is directly irradiated with ultraviolet light from the outside of the vehicle.
- a volume type hologram is known in addition to the relief type hologram described above.
- a volume hologram is formed from a composition containing, for example, a matrix polymer, a photoreactive monomer, a photopolymerization initiator, a photosensitizer, and the like, and when exposed to an interference wave, the photoreactive monomer polymerizes to record an image. Will be done. Further, in the volumetric hologram, the recorded image is reproduced when the reproduction light is irradiated.
- a laminated glass having a volumetric hologram has a problem that it deteriorates due to long-term irradiation with sunlight even if a general ultraviolet absorbing layer is provided as in Patent Documents 1 and 2.
- the present invention provides a laminated glass interlayer film having a specific optical functional layer and having light resistance so that the optical functional layer does not photodegrade even when irradiated with sunlight for a long period of time. That is the issue.
- a first interlayer film for laminated glass having a specific optical functional layer constituting a volumetric hologram contains an ultraviolet absorber and has a transmittance of a certain value or less at a wavelength of 400 nm.
- the above problems can be solved by providing the thermoplastic resin layer of the above, and have completed the following invention.
- An optical functional layer and a first thermoplastic resin layer provided on one surface side of the optical functional layer are provided.
- the optical functional layer contains a polymer of photoreactive monomers and a matrix polymer.
- the interlayer film for laminated glass of the present invention has a specific optical functional layer, it does not photodegrade even when irradiated with sunlight for a long period of time and has good light resistance.
- the interlayer film for laminated glass of the present invention includes an optical functional layer and a first thermoplastic resin layer provided on one surface side of the optical functional layer. Further, it is preferable that the interlayer film for laminated glass of the present invention further includes a second thermoplastic resin layer provided on the other surface side of the optical functional layer.
- the first thermoplastic resin layer is arranged on the outdoor side of the optical functional layer. Further, the second thermoplastic resin layer is arranged on the indoor side of the optical functional layer.
- the optical functional layer used in the present invention contains a polymer of photoreactive monomers and a matrix polymer.
- the optical functional layer contains these components to form a volumetric hologram. That is, the optical functional layer can record image information by being exposed to interference light and polymerizing a photoreactive monomer. More specifically, depending on the intensity of the interference light, the photoreactive monomer and the polymer of the photoreactive monomer can be sparsely packed, and the difference in the refractive index between them and the matrix polymer forms a hologram, and image information is recorded.
- the optical functional layer on which the image information is recorded can reproduce the recorded image by being irradiated with the reproduction light. Therefore, in the optical functional layer, in addition to the polymer of the photoreactive monomer, a photoreactive monomer is also generally present.
- the photoreactive monomer has at least one ethylenically unsaturated double bond and can be polymerized by being exposed to interference light.
- the photoreactive monomer preferably exhibits a relatively high refractive index.
- an acrylic monomer is preferably used as the photoreactive monomer.
- the acrylic monomer is a monomer having either an acryloyl group or a methacryloyl group.
- acrylic monomer examples include 2,3-dibromopropyl acrylate, dicyclopentanyl acrylate, dibromoneopentyl glycol diacrylate, 2-phenoxyethyl acrylate, 2-phenoxymethyl methacrylate, phenolethoxylate monoacrylate, 2-( p-Chlorophenoxy) ethyl acrylate, p-chlorophenyl acrylate, phenyl acrylate, phenyl methacrylate, 2-phenyl ethyl acrylate, 2- (1-naphthyloxy) ethyl acrylate, o-biphenyl methacrylate, o-biphenyl acrylate, benzyl acrylate, phenyl Acrylate, 2-phenylethyl acrylate, 2-phenoxyethyl methacrylate, phenolethoxylate acrylate, methylphenoxyethyl acrylate, phenoxyethoxyethyl
- the acrylic monomer may be one having a 9,9-diarylfluorene skeleton and having at least one (meth) acryloyl group in the molecule, urethane acrylate or the like.
- the urethane acrylate include those composed of a condensate of a phenylisocyanate compound and a compound having a hydroxy group and a (meth) acryloyl group in one molecule.
- a photoreactive monomer other than the acrylic monomer such as styrene, methoxystyrene, 2-chlorostyrene, 2-bromostyrene, N-vinylcarbazole, phenylmaleimide, and 2-vinylnaphthalene may be used.
- the photoreactive monomer may be used alone or in combination of two or more.
- the content of the photoreactive monomer in the optical functional layer is preferably in the range of, for example, 10 to 50% by mass.
- matrix polymer examples include polyvinyl acetate (polyvinyl acetate), polyvinyl butyrate, polyvinyl formal, polyvinyl carbazole, polyacrylic acid, polymethacrylic acid, polymethylacrylate, polymethylmethacrylate, polyethylacrylate, polybutylacrylate, and poly.
- Methacronitrile polyethyl methacrylate, polybutyl methacrylate, polyacrylonitrile, poly-1,2-dichloroethylene, ethylene-vinyl acetate copolymer, tetrafluoroethylene-vinyl acetate copolymer, syndiotactic polymethyl methacrylate, poly - ⁇ -vinylnaphthalate, polycarbonate, cellulose acetate, cellulose triacetate, cellulose acetate butyrate, polystyrene, poly- ⁇ -methylstyrene, poly-o-methylstyrene, poly-p-methylstyrene, poly-p-phenylstyrene, Poly-2,5-dichlorostyrene, poly-p-chlorostyrene, polyarylate, polysulfone, polyethersulfone, styrene-acrylonitrile copolymer, styrene-divinylbenzene copolymer
- a copolymer of tetrafluoroethylene, hexafluoroethylene or the like and vinyl alcohol, vinyl ester, vinyl ether, vinyl acetal, vinyl butyral or the like may be used, or (meth) acrylic acid cyclic aliphatic ester and methyl (meth) acrylate. It may be a copolymer with or a methyl methacrylate-ethyl acrylate-acrylic acid copolymer or the like. Of these, polyurethane is preferred.
- the content of the matrix polymer in the optical functional layer is, for example, in the range of 30 to 80% by mass.
- the optical functional layer preferably contains a photopolymerization initiator.
- a photopolymerization initiator a known photopolymerization initiator can be used, and iodonium salts, triazine compounds, azo compounds, azido compounds, organic peroxides, organic boron salts, onium salts, halogenated hydrocarbon derivatives can be used.
- a radical polymerization initiator system using a hydrogen donor such as a thiol compound in combination with a bisimidazole derivative can also be used.
- the photopolymerization initiator may be a single molecule type or a bimolecular type.
- the polymerization is initiated by the photopolymerization initiator alone.
- the single molecule bond is cleaved by irradiation with interference light to generate a free radical.
- the optical functional layer further contains a dye such as a dye. The bimolecular type initiates polymerization with a polymerization initiator and dye.
- a dye such as a dye absorbs photons and transfers energy from an excited state to a photopolymerization initiator (co-initiator), and the photopolymerization initiator transfers electrons or protons or directly. Desorption of hydrogen releases polymerization-induced free radicals.
- co-initiator for example, ammonium alkylarylborate is used.
- the content of the photopolymerization initiator in the optical functional layer is preferably in the range of, for example, 0.1 to 5% by mass.
- the dye contained in the optical functional layer is not particularly limited, but a known dye or the like can be used.
- cyanine, polymethine, phenothiazine, phenoxazine, phenothiazine, diarylmethane, triarylmethane, (thio) pyrylium salt, squarylium, coumarin, xanthene, thioxanthene, acridine Examples thereof include merocyanine type, thiazolium type, acridine type, hemicyanine type, zeromethine type, streptocyanine type and the like.
- These dyes may be used alone or in combination of two or more, and for example, three or more may be used according to RGB.
- the optical functional layer may appropriately contain a known additive used for volumetric holograms such as a chain transfer agent.
- the thickness of the optical functional layer is not particularly limited, but is, for example, 0.1 to 50 ⁇ m, preferably 1 to 10 ⁇ m.
- the optical functional layer may be formed on, for example, a base material.
- the base material on which the optical functional layer is formed include a resin film.
- Resin films include polycarbonate (PC), polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene, polypropylene, cellulose acetate, cellulose hydrate, nitrocellulose, cycloolefin polymer, polystyrene, polyepoxide, polysulfone, cellulose triacetate (TAC).
- PC polycarbonate
- PET polyethylene terephthalate
- PET polybutylene terephthalate
- polyethylene polypropylene
- cellulose acetate cellulose hydrate
- nitrocellulose cycloolefin polymer
- polystyrene polyepoxide
- polysulfone cellulose triacetate
- TAC cellulose triacetate
- a multilayer film is a multi-layered structure in which a plurality of layers made of different materials are laminated. Of these, a TAC film is preferred.
- the thickness of the base material on which the optical functional layer is formed is, for example, 10 to 200 ⁇ m, preferably 40 to 100 ⁇ m.
- a cover material may be further laminated on the optical functional layer formed on the base material, and both sides of the optical functional layer may be covered with the base material and the cover material, respectively. This makes it easier to protect the optical functional layer.
- the optical functional layer does not necessarily have to be formed on the base material, and may be directly laminated on, for example, the first thermoplastic resin layer or the second thermoplastic resin layer. Further, it may be directly laminated on the glass plate constituting the laminated glass described later.
- a composition for the optical functional layer containing a photoreactive monomer, a matrix polymer, and other additives such as a photopolymerization initiator, a dye, and a chain transfer agent, which are blended as needed.
- the composition for the optical functional layer may be appropriately diluted with a solvent.
- the composition for an optical functional layer may be applied to a base material, a release sheet, or the like and dried if necessary to form an optical functional layer.
- the matrix polymer is a thermosetting resin such as polyurethane
- a precursor component of the matrix polymer for example, polyol and polyisocyanate in the case of polyurethane
- a photoreactive monomer for example, a photoreactive monomer
- a composition for an optical functional layer may be prepared, which comprises other additives such as a photopolymerization initiator, a dye, and a chain transfer agent blended in the above.
- the composition for the optical functional layer may be applied to a base material, a release sheet, or the like, and then the precursor component may be cured. In this case as well, the applied composition for the optical functional layer may be appropriately dried as needed.
- the optical functional layer is exposed and reacted with a photoreactive monomer to convert at least a part of the photoreactive monomer into a polymer.
- a hologram is formed by interfering two types of light waves.
- the optical functional layer on which the hologram is formed on the release sheet may be peeled off from the release sheet and laminated on a first thermoplastic resin layer, a second thermoplastic resin layer, a glass plate, or the like. Further, the optical functional layer may be formed by directly applying the composition for the optical functional layer to the glass plate constituting the laminated glass instead of the base material or the release sheet.
- the first thermoplastic resin layer contains an ultraviolet absorber and has a transmittance of 20% or less at a wavelength of 400 nm.
- the interlayer film for laminated glass has such a first thermoplastic resin layer, which prevents the optical functional layer from photodegrading even when irradiated with sunlight for a long period of time, and provides light resistance. Can be improved.
- the above-mentioned optical functional layer is surprisingly easily deteriorated by light rays in the vicinity of 400 nm, while the ordinary ultraviolet absorbing layer has a not so low absorption rate in the vicinity of 400 nm. Therefore, in the present invention, it is presumed that by controlling the transmittance at a wavelength of 400 nm to be low, the light resistance is improved as compared with the case where the conventional ultraviolet absorbing layer is used.
- the transmittance of the first thermoplastic resin layer at a wavelength of 400 nm is larger than 20%, the optical functional layer is photodegraded by long-term irradiation such as sunlight, and the optical functional layer does not function well for a long period of time.
- the transmittance at a wavelength of 400 nm is preferably 16% or less, more preferably 10% or less, still more preferably 5% or less, still more preferably 3.5% or less.
- the transmittance at a wavelength of 400 nm may be 0% or more, but practically 0.1% or more is preferable, and 0.2% or more is more preferable.
- the first thermoplastic resin layer preferably has a transmittance of 60% or less at a wavelength of 410 nm.
- the optical functional layer is liable to be lightly deteriorated not only by light rays having a wavelength of around 400 nm but also by light rays having a wavelength of around 410 nm. However, by lowering the transmittance at a wavelength of 410 nm, the optical deterioration of the optical functional layer can be prevented more effectively. ..
- the first thermoplastic resin layer preferably has a transmittance of 70% or less at a wavelength of 420 nm.
- the optical functional layer may be photodegraded by light rays in the vicinity of 420 nm, but by setting the transmittance at 420 nm to 70% or less, the photodegradation of the optical functional layer can be effectively prevented. Further, it is more preferable that the first thermoplastic resin layer has a transmittance of 60% or less at a wavelength of 410 nm and a transmittance of 70% or less at a wavelength of 420 nm. When the transmittances of both wavelengths 410 and 420 nm are below a certain value, photodegradation of the optical functional layer can be prevented even more effectively.
- the first thermoplastic resin layer has a transmittance at 410 nm of more preferably 45% or less, further preferably 25% or less, still more preferably 20% or less.
- the transmittance of the first thermoplastic resin layer at 410 nm is not particularly limited, but is, for example, 1% or more, preferably 5% or more, more preferably 10% or more, still more preferably 15% or more.
- the first thermoplastic resin layer has a transmittance of 60% or less at a wavelength of 420 nm. By setting the transmittance at 420 nm to 60% or less, it becomes easier to prevent photodegradation of the optical functional layer.
- the transmittance of the first thermoplastic resin layer at 420 nm is not particularly limited, but is, for example, 1% or more, preferably 7% or more, and more preferably 15% or more. By setting the transmittance at 420 nm to these lower limit values or more, it is possible to prevent the visible light transmittance from being lowered and the laminated glass interlayer film from being colored.
- the first thermoplastic resin layer contains an ultraviolet absorber.
- the first thermoplastic resin layer can prevent the optical functional layer and the first thermoplastic resin layer from being photodegraded by sunlight or the like.
- the ultraviolet absorber include benzotriazole compounds, indole compounds, and porphyrin compounds. These may be used alone or in combination of two or more.
- the transmittance at 400 to 420 nm can be adjusted within a predetermined range as described above by adjusting the type of the ultraviolet absorber to be used and the blending amount.
- the benzotriazole compound used as an ultraviolet absorber is a compound having a benzotriazole skeleton and capable of absorbing ultraviolet rays.
- Examples of the benzotriazole compound include compounds having a maximum absorption wavelength peak in the wavelength region of 300 to 390 nm, preferably 330 to 375 nm, and more preferably 345 to 360 nm.
- the maximum absorption wavelength of the ultraviolet absorber can be measured by the following method. 0.0002 to 0.002 parts by mass of the compound to be measured is mixed with 100 parts by mass of chloroform to obtain a chloroform solution. The obtained chloroform solution is placed in a quartz cell for a spectrophotometer having an optical path length of 1.0 cm. Using a self-recording spectrophotometer (“U4100” manufactured by Hitachi, Ltd.), the transmittance at 300 to 2500 nm is measured to determine the maximum absorption wavelength.
- the maximum absorption wavelength is a wavelength having a minimum transmittance, and there may be a plurality of wavelengths. In that case, the maximum absorption wavelength means a wavelength having the minimum minimum value.
- a preferable specific example of the benzotriazole compound is a compound represented by the following formula (1).
- R 11 represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkoxycarbonylalkyl group having 4 to 20 carbon atoms
- R 12 is a hydrogen atom or an alkyl group having 1 carbon number. Represents an alkyl group of ⁇ 8.
- X is a chlorine atom or a hydrogen atom.
- the alkyl groups of R 11 and R 12 may have a linear structure or may have a branched structure.
- the alkoxycarbonylalkyl group may have a linear structure or may have a branched structure.
- R 11 and R 12 include hydrogen atom, methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, tert-butyl group, pentyl group, hexyl group and octyl group.
- R 11 includes a methoxycarbonylpropyl group, an octyloxycarbonylpropyl group and the like.
- R 11 is preferably a hydrogen atom or an alkyl group, particularly preferably a hydrogen atom, a methyl group, a tert-butyl group, a pentyl group, or an octyl group.
- R 11 and R 12 may be the same or different.
- Specific examples of the compound represented by the formula (1) include 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole and 2- (3,5-di-).
- the compound represented by the formula (1) is preferably a compound having a maximum absorption wavelength peak in the wavelength region of 330 to 375 nm, more preferably 345 to 360 nm.
- the indole compound is a compound having an indole skeleton and capable of absorbing ultraviolet rays.
- the indole-based compound preferably includes a compound represented by the following formula (2).
- R 21 represents an alkyl group having 1 to 3 carbon atoms
- R 22 is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an aralkyl group having 7 to 10 carbon atoms. Represents.
- the alkyl groups of R 21 and R 22 may each have a linear structure or may have a branched structure.
- R 21 in the above formula (2) include a methyl group, an ethyl group, an isopropyl group, an n-propyl group and the like.
- R 21 is preferably a methyl group, an ethyl group and an isopropyl group. From the viewpoint of light resistance, it is more preferably a methyl group or an ethyl group.
- R 22 in the formula (2) is preferably an alkyl group having 1 to 10 carbon atoms, and more preferably an alkyl group having 1 to 8 carbon atoms.
- alkyl group having 1 to 10 carbon atoms examples include a methyl group, an ethyl group, an isopropyl group, an n-propyl group, an isobutyl group, an n-butyl group, a pentyl group, a hexyl group, a 2-ethylhexyl group and an n-octyl group. Group etc. can be mentioned.
- Examples of the aralkyl group having 7 to 10 carbon atoms include a benzyl group, a phenylethyl group, a phenylpropyl group and a phenylbutyl group.
- the indole-based compound is not particularly limited, but has a maximum absorption wavelength peak of, for example, 375 to 405 nm, preferably 380 to 400 nm, and more preferably 385 to 395 nm.
- the porphyrin compound used in the present invention is a compound having a porphyrin skeleton and capable of absorbing ultraviolet rays.
- the porphyrin compound has a maximum absorption wavelength peak of, for example, 380 to 430 nm, preferably 390 to 425 nm, and more preferably 400 to 420 nm.
- Specific examples of the porphyrin compound include a compound represented by the following formula (3).
- R 31 to R 34 are hydrocarbon groups that may independently have a hydrogen atom or a hetero atom.
- M include metal atoms such as copper, magnesium, cobalt, zinc, manganese, and iron. Among them, copper, manganese, iron, and cobalt are preferable, and copper is more preferable.
- the carbon atoms of R 31 to R 34 are independently 1 to 24, preferably 1 to 18, and more preferably 6 to 12.
- the hetero atom include a nitrogen atom, a sulfur atom, an oxygen atom, a halogen atom and the like.
- R 31 to R 34 examples include aromatic rings that may each have a substituent.
- the number of substituents in each of the aromatic rings of R 31 to R 34 is not particularly limited, but is, for example, 0 to 5, preferably 0 to 3, more preferably 1 to 2, and most preferably 1. ..
- the substituent is preferably a substituent having an electron-withdrawing property.
- Specific examples of the substituent include halogen atoms such as chlorine atom, bromine atom, fluorine atom and iodine atom, carboxyl group (-COOH), nitrile group (-CN), nitro group (-NO 2 ) and aldehyde group (-NO 2 ). CHO), ester group (-COOR) and the like.
- the R in the ester group is, for example, an alkyl group having 1 to 6 carbon atoms, preferably an alkyl group having 1 to 4 carbon atoms, and more preferably an alkyl group having 1 to 2 carbon atoms.
- an ester group is preferable.
- examples of the aromatic ring include a benzene ring, a naphthalene ring, a phenanthrene ring, an anthracene ring and the like.
- the aromatic ring may be a polycycle containing a benzene ring, which is provided with a heterocycle forming a 5-membered ring or a 6-membered ring together with the benzene ring.
- hetero atom constituting the heterocycle examples include a nitrogen atom, an oxygen atom, and a sulfur atom.
- the aromatic ring is preferably a benzene ring.
- the aromatic ring may be directly bonded to the porphyrin skeleton by a single bond.
- a preferable specific example of a porphyrin compound is a compound represented by the following formula (3-1).
- R 35 to R 38 are the above-mentioned substituents independently, and among them, an ester group is preferable.
- the positions of R 35 to R 38 may be any of the ortho, meta, and para positions, but the para position is preferable from the viewpoint of ease of manufacture.
- the content of the ultraviolet absorber in the first thermoplastic resin layer is not limited as long as the transmittance at 400 nm is 20% or less, but is preferably more than 0.2% by mass with respect to 100 parts by mass of the thermoplastic resin. It is more preferably 0.3 parts by mass or more, still more preferably 0.4 parts by mass or more. By setting the content of the ultraviolet absorber to these lower limit values or more, it becomes easy to lower the transmittance at 400 to 420 nm.
- the content of the ultraviolet absorber in the first thermoplastic resin layer is preferably 2.0 parts by mass or less, more preferably 1.5 parts by mass or less, still more preferably 1.5 parts by mass or less, based on 100 parts by mass of the thermoplastic resin. It is 1.0 part by mass or less.
- the ultraviolet absorber can be appropriately dispersed or dissolved in the thermoplastic resin, and it becomes easy to exert an effect commensurate with the content.
- the content of the ultraviolet absorber is the total content of two or more kinds of ultraviolet absorbers when they are contained.
- the first thermoplastic resin layer preferably contains a benzotriazole compound among the above-mentioned ultraviolet absorbers.
- a benzotriazole compound among the above-mentioned ultraviolet absorbers.
- the content of the benzotriazole compound in the first thermoplastic resin layer is preferably 0.15 parts by mass or more, more preferably 0.2 parts by mass or more, and 0.4 parts by mass with respect to 100 parts by mass of the thermoplastic resin.
- the above is more preferable, and 0.6 parts by mass or more is particularly preferable. Further, 1.5 parts by mass or less is preferable, and 1.0 part by mass or less is more preferable.
- the benzotriazole compound may be used alone as an ultraviolet absorber. Even if the benzotriazole compound is used alone as the ultraviolet absorber, the transmittance at 400 nm can be lowered as described above by adjusting the blending amount.
- the content of the benzotriazole compound when used alone is preferably 0.35 parts by mass or more, more preferably 0.4 parts by mass or more, and 0.7 parts by mass or more with respect to 100 parts by mass of the thermoplastic resin. Further, 1.5 parts by mass or less is preferable, and 1.0 part by mass or less is more preferable.
- the benzotriazole compound is preferably used in combination with other UV absorbers as a UV absorber.
- the preferable ultraviolet absorber to be used in combination with the benzotriazole compound is at least one selected from indole compounds and porphyrin compounds.
- the content of the benzotriazole compound in the first thermoplastic resin layer when used in combination with another ultraviolet absorber is preferably 0.15 parts by mass or more, preferably 0.2 parts by mass, based on 100 parts by mass of the thermoplastic resin. More than parts, more preferably 0.4 parts by mass or more, and particularly preferably 0.6 parts by mass or more. Further, 1.2 parts by mass or less is preferable, and 1.0 part by mass or less is more preferable.
- the benzotriazole compound when the value is not more than the upper limit, the benzotriazole compound is appropriately dispersed or dissolved in the thermoplastic resin, and it becomes easy to exert an effect commensurate with the content. In addition, it is possible to prevent the first thermoplastic resin layer from being colored by the benzotriazole compound.
- the content of at least one selected from the indole compound and the porphyrin compound when used in combination is preferably 0.001 part by mass or more, preferably 0.002 part by mass or more, based on 100 parts by mass of the thermoplastic resin. More preferably, 0.003 parts by mass or more is further preferable. Further, 0.5 parts by mass or less is preferable, 0.3 parts by mass or less is more preferable, 0.1 parts by mass or less is further preferable, and 0.03 parts by mass or less is further preferable.
- the ultraviolet absorber preferably contains a low wavelength side ultraviolet absorber and a high wavelength side ultraviolet absorber having a maximum absorption wavelength peak on the higher wavelength side than the low wavelength side ultraviolet absorber.
- the low wavelength side ultraviolet absorber is, for example, a compound having a maximum absorption wavelength peak in a wavelength region of 300 to 380 nm, preferably 330 to 375 nm, and more preferably 345 to 360 nm.
- the low-wavelength UV absorber is, for example, the above-mentioned benzotriazole compound, and preferably the above-mentioned compound represented by the formula (1).
- the ultraviolet absorber on the high wavelength side is, for example, 380 to 430 nm, preferably 390 to 425 nm, and more preferably 400 to 420 nm.
- the high wavelength side ultraviolet absorber is, for example, at least one selected from the above-mentioned indole compound and porphyrin compound, and is preferably selected from the compound represented by the formula (2) and the compound represented by the formula (3). At least one kind.
- the content of the low wavelength side ultraviolet absorber in the first thermoplastic resin layer is preferably 0.15 parts by mass or more, more preferably 0.2 parts by mass or more, and 0 parts by mass with respect to 100 parts by mass of the thermoplastic resin. .4 parts by mass or more is more preferable, and 0.6 parts by mass or more is particularly preferable. Further, 1.2 parts by mass or less is preferable, and 1.0 part by mass or less is more preferable.
- the ultraviolet absorber when the value is set to the upper limit or less, the ultraviolet absorber is appropriately dispersed or dissolved in the thermoplastic resin, and the effect commensurate with the content is easily exhibited. In addition, it is possible to prevent the first thermoplastic resin layer from being colored by the ultraviolet absorber.
- the content of the long wavelength side ultraviolet absorber is preferably 0.001 part by mass or more, more preferably 0.002 part by mass or more, and further more preferably 0.003 part by mass or more with respect to 100 parts by mass of the thermoplastic resin. It is preferable, 0.5 parts by mass or less is preferable, 0.3 parts by mass or less is more preferable, 0.1 parts by mass or less is further preferable, and 0.03 parts by mass or less is further preferable.
- the first thermoplastic resin layer contains a thermoplastic resin.
- the first thermoplastic resin layer By containing the thermoplastic resin, the first thermoplastic resin layer easily functions as an adhesive layer, and has good adhesiveness to an optical functional layer, a glass plate, or the like.
- the thermoplastic resin is not particularly limited, and examples thereof include polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ionomer resin, polyurethane resin, and thermoplastic elastomer. By using these resins, it becomes easy to secure the adhesiveness with the glass plate.
- one type of thermoplastic resin may be used alone, or two or more types may be used in combination.
- At least one selected from a polyvinyl acetal resin and an ethylene-vinyl acetate copolymer resin is preferable, and in particular, when used in combination with a plasticizer, it exhibits excellent adhesiveness to a glass plate. Therefore, a polyvinyl acetal resin is more preferable.
- the polyvinyl acetal resin is not particularly limited as long as it is a polyvinyl acetal resin obtained by acetalizing polyvinyl alcohol with an aldehyde, but a polyvinyl butyral resin is preferable.
- the preferable lower limit of the acetalization degree of the polyvinyl acetal resin 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 preferable lower limit of the amount of hydroxyl groups in the polyvinyl acetal resin is 15 mol%, and the preferable upper limit is 35 mol%.
- the amount of hydroxyl groups is 15 mol% or more, the adhesiveness with a glass plate or the like is likely to be improved, and the penetration resistance of the laminated glass is likely to be improved. Further, by setting the amount of hydroxyl groups to 35 mol% or less, it is possible to prevent the laminated glass from becoming too hard.
- the more preferable lower limit of the amount of hydroxyl groups is 25 mol%, and the more preferable upper limit is 33 mol%.
- the preferable lower limit of the amount of hydroxyl groups is 15 mol%, the preferable upper limit is 35 mol%, the more preferable lower limit is 25 mol%, and the more preferable upper limit is 33 mol. %.
- the degree of acetalization and the amount of hydroxyl groups can be measured by, for example, a method based on JIS K6728 "polyvinyl butyral test method".
- the polyvinyl acetal resin can be prepared by acetalizing polyvinyl alcohol with an aldehyde.
- Polyvinyl alcohol is usually obtained by saponifying polyvinyl acetate, and polyvinyl alcohol having a saponification degree of 80 to 99.8 mol% is generally used.
- the preferable lower limit of the degree of polymerization of the polyvinyl acetal resin is 500, and the preferable upper limit is 4000. When the degree of polymerization is 500 or more, the penetration resistance of the laminated glass is improved. Further, by setting the degree of polymerization to 4000 or less, it becomes easy to mold the laminated glass.
- the more preferable lower limit of the degree of polymerization is 1000, and the more preferable upper limit is 3600.
- the above aldehyde is not particularly limited, but in general, an aldehyde having 1 to 10 carbon atoms is preferably used.
- the aldehyde having 1 to 10 carbon atoms is not particularly limited, and for example, n-butyraldehyde, isobutylaldehyde, n-barrelaldehyde, 2-ethylbutylaldehyde, n-hexylaldehyde, n-octylaldehyde, and n-nonylaldehyde are not particularly limited. , N-decylaldehyde, formaldehyde, acetaldehyde, benzaldehyde and the like.
- n-butyraldehyde, n-hexylaldehyde, and n-barrelaldehyde are preferable, and n-butyraldehyde is more preferable.
- These aldehydes may be used alone or in combination of two or more.
- the ethylene-vinyl acetate copolymer resin may be a non-crosslinked ethylene-vinyl acetate copolymer resin or a high-temperature crosslinked ethylene-vinyl acetate copolymer resin. Further, as the ethylene-vinyl acetate copolymer resin, an ethylene-vinyl acetate modified resin such as an ethylene-vinyl acetate copolymer saponified product and an ethylene-vinyl acetate hydrolyzate can also be used.
- the ethylene-vinyl acetate copolymer resin preferably has a vinyl acetate content of 10 to 50% by mass, more preferably 20 to 40% by mass, as measured in accordance with JIS K 6730 "Ethylene-vinyl acetate resin test method". ..
- a vinyl acetate content 10 to 50% by mass, more preferably 20 to 40% by mass, as measured in accordance with JIS K 6730 "Ethylene-vinyl acetate resin test method". ..
- the vinyl acetate content By setting the vinyl acetate content to these lower limit values or more, the adhesiveness to the glass is increased, and the penetration resistance of the laminated glass is likely to be improved. Further, by setting the vinyl acetate content to these upper limit values or less, the breaking strength of the first thermoplastic resin layer is increased, and the impact resistance of the laminated glass is improved.
- the ionomer resin is not particularly limited, and various ionomer resins can be used. Specific examples thereof include ethylene-based ionomers, styrene-based ionomers, perfluorocarbon-based ionomers, telechelic ionomers, and polyurethane ionomers. Among these, ethylene-based ionomers are preferable because the mechanical strength, durability, transparency, etc. of the laminated glass are improved, and the adhesiveness to the glass is excellent.
- an ethylene / unsaturated carboxylic acid copolymer ionomer is preferably used because it has excellent transparency and toughness.
- the ethylene / unsaturated carboxylic acid copolymer is a copolymer having at least a structural unit derived from ethylene and a structural unit derived from unsaturated carboxylic acid, and may have a structural unit derived from another monomer.
- the unsaturated carboxylic acid include acrylic acid, methacrylic acid, maleic acid and the like, and acrylic acid and methacrylic acid are preferable, and methacrylic acid is particularly preferable.
- examples of other monomers include acrylic acid ester, methacrylic acid ester, 1-butene and the like.
- the ethylene / unsaturated carboxylic acid copolymer As the ethylene / unsaturated carboxylic acid copolymer, assuming that the total structural units of the copolymer are 100 mol%, it is preferable to have 75 to 99 mol% of the structural units derived from ethylene, and the copolymer is derived from unsaturated carboxylic acid. It preferably has 1 to 25 mol% of structural units.
- the ionomer of the ethylene / unsaturated carboxylic acid copolymer is an ionomer resin obtained by neutralizing or cross-linking at least a part of the carboxyl groups of the ethylene / unsaturated carboxylic acid copolymer with metal ions. The degree of neutralization of the carboxyl group is usually 1 to 90%, preferably 5 to 85%.
- Examples of the ion source in the ionomer resin include alkali metals such as lithium, sodium, potassium, rubidium and cesium, and polyvalent metals such as magnesium, calcium and zinc, and sodium and zinc are preferable.
- the method for producing the ionomer resin is not particularly limited, and the ionomer resin can be produced by a conventionally known production method.
- the ionomer resin when an ionomer of an ethylene / unsaturated carboxylic acid copolymer is used as the ionomer resin, for example, ethylene and unsaturated carboxylic acid are subjected to radical copolymerization at high temperature and high pressure to carry out radical copolymerization of ethylene / unsaturated carboxylic acid. Produce a copolymer.
- polyurethane resin examples include polyurethane obtained by reacting an isocyanate compound with a diol compound, polyurethane obtained by reacting an isocyanate compound with a diol compound, and a chain length extender such as polyamine. Further, the polyurethane resin may contain a sulfur atom. In that case, some or all of the above diols may be selected from polythiols and sulfur-containing polyols.
- the polyurethane resin can improve the adhesiveness with the organic glass. Therefore, it is preferably used when the glass plate is organic glass.
- thermoplastic elastomer examples include styrene-based thermoplastic elastomers and aliphatic polyolefins.
- the styrene-based thermoplastic elastomer is not particularly limited, and known ones can be used.
- the styrene-based thermoplastic elastomer generally has a styrene monomer polymer block as a hard segment and a conjugated diene compound polymer block as a soft segment or a hydrogenated block thereof.
- styrene-based thermoplastic elastomer examples include styrene-isoprene block copolymer, styrene-butadiene diblock copolymer, styrene-isoprene-styrene triblock copolymer, and styrene-butadiene / isoprene-styrene triblock.
- examples include polymers, styrene-butadiene-styrene triblock copolymers, and hydrogenated products thereof.
- the aliphatic polyolefin may be a saturated aliphatic polyolefin or an unsaturated aliphatic polyolefin.
- the aliphatic polyolefin may be a polyolefin having a chain olefin as a monomer or a polyolefin having a cyclic olefin as a monomer. From the viewpoint of effectively enhancing the storage stability and sound insulation of the interlayer film, the aliphatic polyolefin is preferably a saturated aliphatic polyolefin. Examples of the material for the aliphatic polyolefin include ethylene, propylene, 1-butene, trans-2-butene, cis-2-butene, 1-pentene, trans-2-pentene, cis-2-pentene, 1-hexene and trans.
- the first thermoplastic resin layer may further contain a plasticizer.
- the first thermoplastic resin layer becomes flexible by containing a plasticizer, and as a result, the laminated glass becomes flexible. Furthermore, it is possible to exhibit high adhesiveness to the glass plate.
- the first thermoplastic resin layer is particularly effective when it contains a plasticizer.
- the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic subphosphate plasticizers. .. Of these, organic ester plasticizers are preferable.
- Organic ester plasticizers include, for example, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, triethylene glycol di-n-octanoate, triethylene glycol.
- Examples of the mixed adipate ester include an adipate ester prepared from two or more alcohols selected from an alkyl alcohol having 4 to 9 carbon atoms and a cyclic alcohol having 4 to 9 carbon atoms.
- adipate ester prepared from two or more alcohols selected from an alkyl alcohol having 4 to 9 carbon atoms and a cyclic alcohol having 4 to 9 carbon atoms are particularly preferably used.
- the content of the plasticizer in the first thermoplastic resin layer is not particularly limited, but the preferable lower limit is 30 parts by mass and the preferable upper limit is 70 parts by mass with respect to 100 parts by mass of the thermoplastic resin.
- the content of the plasticizer is 30 parts by mass or more, the laminated glass becomes moderately flexible and the handleability and the like are improved. Further, when the content of the plasticizer is 70 parts by mass or less, the plasticizer is prevented from being separated from the first thermoplastic resin layer.
- the more preferable lower limit of the content of the plasticizer is 35 parts by mass, and the more preferable upper limit is 63 parts by mass.
- the first thermoplastic resin layer is mainly composed of a thermoplastic resin or a thermoplastic resin and a plasticizer, and the total amount of the thermoplastic resin and the plasticizer is the total amount of the first thermoplastic resin layer.
- it is usually 70% by mass or more, preferably 80% by mass or more, and more preferably 90% by mass or more.
- the first thermoplastic resin layer further contains additives such as an infrared absorber, an antioxidant, a light stabilizer, an adhesive strength modifier, a pigment, a dye, a fluorescent whitening agent, and a crystal nucleating agent, if necessary. You may.
- the infrared absorber is not particularly limited as long as it has the ability to shield infrared rays, but for example, tin-doped indium oxide particles are suitable. By containing the infrared absorber, the first thermoplastic resin layer can exhibit high heat shielding properties.
- the antioxidant is not particularly limited, and for example, 2,2-bis [[[3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyl] oxy] methyl] propan-1,3- Diol 1,3-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 4,4'-thiobis (6-tert-butyl-3-methylphenol), 4,4 '-Dimethyl-6,6'-di (tert-butyl) [2,2'-methylenebis (phenol)], 2,6-di-t-butyl-p-cresol, 4,4'-butylidenebis- (6) -T-Butyl-3-methylphenol) and the like.
- the crystal nucleating agent is not particularly limited, and examples thereof include dibenzylidene sorbitol, dibenzidenexylitol, dibenzideneacetonelcitol, dibenzidenemannitol, and calixarene.
- the crystal nucleating agent is preferably used when an ethylene-vinyl acetate copolymer resin is used as the thermoplastic resin.
- As the adhesive strength adjusting agent for example, various magnesium salts or potassium salts are used.
- the thickness of the first thermoplastic resin layer is preferably 0.05 to 1.5 mm, more preferably 0.1 to 1 mm, and even more preferably 0.2 to 0.6 mm.
- the thickness of the first thermoplastic resin layer is preferably 0.05 to 1.5 mm, more preferably 0.1 to 1 mm, and even more preferably 0.2 to 0.6 mm.
- the interlayer film for laminated glass of the present invention further includes a second thermoplastic resin layer on the other surface side of the optical functional layer.
- the interlayer film for laminated glass having the optical functional layer can be easily adhered to the two glass plates constituting the laminated glass.
- the transmittance of the second thermoplastic resin layer at a wavelength of 400 nm is T400 (2) and the transmittance of the first thermoplastic resin layer at a wavelength of 400 nm is T400 (1), T400 (2)> T400. It is preferable to satisfy the relationship (1).
- T400 (2) transmittance of the second thermoplastic resin layer as described above, it becomes easier to increase the visible light transmittance, and coloring and the like are prevented, so that it can be used for automobile windshields and the like. Can be suitably used.
- the difference in transmittance (T400 (2) -T400 (1)) between the first and second thermoplastic resin layers at a wavelength of 400 nm is preferably 5% or more, more preferably 10% or more.
- the difference (T400 (2) -T400 (1)) is not particularly limited, but may be, for example, 60% or less, or 50% or less.
- the transmittance (T400 (2)) of the second thermoplastic resin layer at a wavelength of 400 nm is not particularly limited, but is, for example, 20% or more, preferably 30% or more, and for example, 80% or less, preferably 80% or less. It is 60% or less.
- T410 (2) when the transmittance of the second thermoplastic resin layer at a wavelength of 410 nm is T410 (2) and the transmittance of the first thermoplastic resin layer at a wavelength of 410 nm is T410 (1), T410 (2)> T410 ( It is preferable to satisfy the relationship of 1).
- T410 (2) By increasing the transmittance (T410 (2)) of the second thermoplastic resin layer in this way, it becomes easy to increase the visible light transmittance, and it is possible to prevent coloring and the like, which is suitable for automobile windshields and the like. Can be used for. From the viewpoint of increasing the visible light transmittance and facilitating prevention of coloring, the difference in transmittance between the first and second thermoplastic resin layers at a wavelength of 410 nm (T410 (2) -T410 (1)) is 5%.
- the above is preferable, 10% or more is more preferable, 20% or more is further preferable, and 30% or more is further preferable.
- the difference (T410 (2) -T410 (1)) is not particularly limited, but may be, for example, 70% or less, or 60% or less.
- the transmittance (T410 (2)) of the second thermoplastic resin layer at a wavelength of 410 nm is not particularly limited, but is, for example, 40% or more, preferably 50% or more, and for example, 95% or less, preferably 95% or less. It is 80% or less.
- T420 (2) when the transmittance of the second thermoplastic resin layer at a wavelength of 420 nm is T420 (2) and the transmittance of the first thermoplastic resin layer at a wavelength of 420 nm is T420 (1), then T420 (2)> T420 ( It is preferable to satisfy the relationship of 1).
- T420 (2) By increasing the transmittance (T420 (2)) of the second thermoplastic resin layer in this way, it becomes easier to increase the visible light transmittance, and it is possible to prevent coloring and the like, which is suitable for automobile windshields and the like. Can be used for.
- the difference in transmittance between the first and second thermoplastic resin layers at a wavelength of 420 nm is 3%.
- the above is preferable, 5% or more is more preferable, 20% or more is further preferable, and 25% or more is further preferable.
- the difference (T420 (2) -T420 (1)) is not particularly limited, but may be, for example, 80% or less, or 70% or less.
- the transmittance (T420 (2)) of the second thermoplastic resin layer at a wavelength of 420 nm is not particularly limited, but is, for example, 45% or more, preferably 55% or more, and for example, 95% or less, preferably 95% or less. It is 90% or less.
- the second thermoplastic resin layer is a layer containing a thermoplastic resin
- the thermoplastic resin used for the second thermoplastic resin layer is not particularly limited, but for example, a polyvinyl acetal resin or ethylene-vinyl acetate. Examples thereof include copolymer resins, ionomer resins, polyurethane resins, and thermoplastic elastomers. By using these resins, it becomes easy to secure the adhesiveness with the glass plate.
- one type of thermoplastic resin may be used alone, or two or more types may be used in combination.
- At least one selected from polyvinyl acetal resin and ethylene-vinyl acetate copolymer resin is preferable, and in particular, when used in combination with a plasticizer, it exhibits excellent adhesiveness to glass.
- Polyvinyl acetal resin is more preferable.
- thermoplastic resin in the first thermoplastic resin layer and the thermoplastic resin in the second thermoplastic resin the same type of resin may be used, or different types of resins may be used, but the same type may be used. It is preferable to use the resin of.
- the thermoplastic resin in the first thermoplastic resin layer is a polyvinyl acetal resin
- the thermoplastic resin in the second thermoplastic resin layer is also a polyvinyl acetal resin.
- the thermoplastic resin in the first thermoplastic resin layer is an ethylene-vinyl acetate copolymer resin
- the thermoplastic resin in the second thermoplastic resin layer is also an ethylene-vinyl acetate copolymer resin. It is preferable to have.
- the details of the polyvinyl acetal resin, the ethylene-vinyl acetate copolymer resin, the ionomer resin, the polyurethane resin, and the thermoplastic elastomer are as described in the first thermoplastic resin layer, and thus the description thereof will be omitted.
- the second thermoplastic resin layer may further contain a plasticizer.
- the second thermoplastic resin layer becomes flexible by containing a plasticizer, and as a result, the laminated glass becomes flexible. Furthermore, it is possible to exhibit high adhesiveness to the glass plate.
- the polyvinyl acetal resin is used as the thermoplastic resin
- the second thermoplastic resin layer is particularly effective when it contains a plasticizer.
- the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic subphosphate plasticizers. .. Specific examples of the plasticizer are as described above.
- an organic ester plasticizer is preferable, and triethylene glycol-di-2-ethylhexanoate (3GO) is particularly preferably used.
- 3GO triethylene glycol-di-2-ethylhexanoate
- one type of plasticizer may be used alone, or two or more types may be used in combination.
- the content of the plasticizer is not particularly limited, but the preferable lower limit is 30 parts by mass and the preferable upper limit is 70 parts by mass with respect to 100 parts by mass of the thermoplastic resin.
- the content of the plasticizer is 30 parts by mass or more, the laminated glass becomes moderately flexible and the handleability and the like are improved. Further, when the content of the plasticizer is 70 parts by mass or less, the plasticizer is prevented from being separated from the second thermoplastic resin layer.
- the more preferable lower limit of the content of the plasticizer is 35 parts by mass, and the more preferable upper limit is 63 parts by mass.
- the second thermoplastic resin layer is mainly composed of a thermoplastic resin or a thermoplastic resin and a plasticizer, and the total amount of the thermoplastic resin and the plasticizer is based on the total amount of the second thermoplastic resin. It is usually 70% by mass or more, preferably 80% by mass or more, and more preferably 90% by mass or more.
- the second thermoplastic resin layer preferably contains an ultraviolet absorber.
- an ultraviolet absorber By containing the ultraviolet absorber, it is possible to prevent the second thermoplastic resin layer from being deteriorated by sunlight or the like. Further, when a laminated glass containing an interlayer film for laminated glass is used as, for example, a window glass, it is possible to prevent ultraviolet rays from being transmitted to the indoor side through the window glass.
- the ultraviolet absorber is not particularly limited, and a known ultraviolet absorber may be used, but the above-mentioned ultraviolet absorber may be used, and a benzotriazole compound is preferably used. By using the benzotriazole compound, the ultraviolet rays contained in sunlight can be effectively absorbed by the ultraviolet absorber.
- the ultraviolet absorber may be used alone or in combination of two or more.
- the ultraviolet absorber in the second thermoplastic resin layer is a compound having a maximum absorption wavelength peak in the wavelength region of, for example, 330 to 390 nm, preferably 330 to 375 nm, and more preferably 345 to 360 nm. By using such a compound, the ultraviolet absorber can effectively absorb the ultraviolet rays contained in sunlight.
- the content of the ultraviolet absorber in 100 parts by mass of the thermoplastic resin in the second thermoplastic resin layer is preferably smaller than the content of the ultraviolet absorber in 100 parts by mass of the thermoplastic resin in the first thermoplastic resin layer.
- the content of the ultraviolet absorber in the specific second thermoplastic resin layer is preferably, for example, 0.02 parts by mass or more, more preferably 0.10 parts by mass or more, and 0, with respect to 100 parts by mass of the thermoplastic resin. .15 parts by mass or more is further preferable, 1.0 parts by mass or less is preferable, 0.5 parts by mass or less is more preferable, and 0.4 parts by mass or less is further preferable.
- the second thermoplastic resin layer further contains additives such as an infrared absorber, an antioxidant, a light stabilizer, an adhesive strength modifier, a pigment, a dye, a fluorescent whitening agent, and a crystal nucleating agent, if necessary. You may. Details of these additives are as described above.
- the thickness of the second thermoplastic resin layer is preferably 0.05 to 1.5 mm, more preferably 0.1 to 1 mm, and even more preferably 0.2 to 0.6 mm.
- the thickness of the second thermoplastic resin layer is preferably 0.05 to 1.5 mm, more preferably 0.1 to 1 mm, and even more preferably 0.2 to 0.6 mm.
- the first and second thermoplastic resin layers are each made of a material constituting each thermoplastic resin layer such as a thermoplastic resin, an ultraviolet absorber, a plasticizer added as needed, and other additives. It may be formed of a thermoplastic resin composition. Specifically, the thermoplastic resin composition obtained by kneading the materials constituting each thermoplastic resin layer may be formed by extrusion molding, press molding or the like. At this time, when a plasticizer is used, the ultraviolet absorber may be dissolved in the plasticizer, and the mixture thereof may be kneaded with a thermoplastic resin such as a polyvinyl acetal resin to prepare a thermoplastic resin composition.
- a thermoplastic resin composition obtained by kneading the materials constituting each thermoplastic resin layer may be formed by extrusion molding, press molding or the like.
- the ultraviolet absorber may be dissolved in the plasticizer, and the mixture thereof may be kneaded with a thermoplastic resin such as a polyvinyl acetal resin to prepare a thermo
- the laminated glass of the present invention includes a pair of glass plates and the above-mentioned interlayer film for laminated glass arranged between the pair of glass plates.
- the pair of glass plates are bonded by an interlayer film for laminated glass to form a laminated glass.
- the glass plate used in the laminated glass may be either inorganic glass or organic glass, but inorganic glass is preferable.
- the inorganic glass is not particularly limited, and examples thereof include clear glass, float glass, polished glass, template glass, meshed glass, wire-reinforced glass, and green glass.
- the organic glass what is generally called resin glass is used, and examples thereof include organic glass composed of a resin such as polycarbonate, acrylic resin, acrylic copolymer resin, and polyester, although the glass is not particularly limited.
- the two glass plates may be made of the same kind of material as each other, or may be made of different materials.
- one may be inorganic glass and the other may be organic glass, but it is preferable that both of the two glass plates are inorganic glass or organic glass.
- the thickness of each glass plate is not particularly limited, but is, for example, about 0.1 to 15 mm, preferably 0.5 to 5 mm.
- the thickness of each glass plate may be the same as or different from each other, but is preferably the same.
- the laminated glass of the present invention has a visible light transmittance of, for example, 50% or more, preferably 70% or more, and more preferably 80% or more.
- a visible light transmittance of, for example, 50% or more, preferably 70% or more, and more preferably 80% or more.
- the upper limit of the visible light transmittance is not particularly limited, but may be, for example, 99%, and may be 95% in practice.
- the laminated glass of the present invention is used, for example, as a window glass, and is used, for example, in an outdoor window in which one glass plate of the laminated glass is arranged on the outdoor side where sunlight is incident.
- the outdoor window means a window arranged at a position where sunlight is incident. Therefore, the outdoor window is usually arranged on the outer surface of a building or the outer surface of a vehicle, but if it is arranged at a position where sunlight is incident even on an inner window of a double-glazed window, the present specification Included in the outdoor window of the calligraphy.
- the laminated glass of the present invention is preferably used for windowpanes of various vehicles such as automobiles, trains and ships, and various buildings such as buildings, condominiums, detached houses, halls and gymnasiums, and is used for automobiles. More preferably, it is used for window glass.
- the window glass for automobiles may be a windshield, a rear glass, a side glass, or a roof glass, but it is preferably used for the windshield.
- a laminated glass having an optical functional layer is used for the windshield, it can be suitably used for HUD applications.
- the first thermoplastic resin layer may be arranged on the outdoor side of the optical functional layer. That is, in the window glass for automobiles, the first thermoplastic resin layer may be arranged on the outer side of the vehicle rather than the optical functional layer.
- the first thermoplastic resin layer By arranging the first thermoplastic resin layer on the outdoor side of the optical functional layer, the light from sunlight is incident on the optical functional layer via the first thermoplastic resin layer. Become.
- the first thermoplastic resin layer sufficiently absorbs ultraviolet rays and light rays in the vicinity of 400 nm, photodegradation of the optical functional layer can be appropriately prevented.
- FIG. 1 shows an interlayer film for laminated glass and a laminated glass according to the first embodiment.
- the laminated glass interlayer film according to the first embodiment has first and second thermoplastic resin layers.
- the laminated glass interlayer film 10 in the present embodiment includes first and second thermoplastic resin layers 11 and 12 and an optical functional layer 15, and one surface of the optical functional layer 15 is provided.
- the first thermoplastic resin layer 11 is arranged on the 15A side
- the second thermoplastic resin layer 12 is arranged on the other surface 15B side of the optical functional layer 15.
- the optical functional layer 15 is a layer formed on the base material 14, and therefore, the base material 14 is provided on the other surface 15B of the optical functional layer 15. Therefore, the second thermoplastic resin layer 12 is laminated on the optical functional layer 15 via the base material 14.
- the laminated glass 20 of the present embodiment includes two glass plates (first and second glass plates) 21 and 22, and an interlayer film 10 for laminated glass arranged between the glass plates 21 and 22. ..
- the first and second thermoplastic resin layers 11 and 12 of the laminated glass interlayer film 10 are adhered to the first and second glass plates 21 and 22, respectively.
- the first glass plate 21 is a glass plate arranged on the outdoor side (outside the vehicle in the window glass for automobiles)
- the second glass plate 22 is the glass plate arranged on the indoor side (inside the vehicle in the window glass for automobiles).
- FIG. 1 shows a first embodiment in which the laminated glass interlayer film 10 has the first and second thermoplastic resin layers 11 and 12, but the first and second thermoplastic resin layers 11 and 12 are shown.
- the aspect of the interlayer film 10 for laminated glass is not limited to the configuration shown in FIG.
- the base material 14 may be provided on one surface 15A of the optical functional layer 15, in which case the first thermoplastic resin layer 11 is laminated on the optical functional layer 15 via the base material 14. .
- the base material 14 may be omitted, and both sides of the optical functional layer 14 may be directly laminated on the first and second thermoplastic resin layers 11 and 12.
- a cover material (not shown) may be laminated on one surface 15A of the optical functional layer 15, and both sides of the optical functional layer 15 may be covered with the base material 14 and the cover material.
- the first and second thermoplastic resin layers 11 and 12 may be laminated on the optical functional layer 15 via the cover material and the base material, respectively.
- the base material 14 may be laminated on one surface 15A of the optical functional layer 15, and the cover material may be laminated on the other surface 15B of the optical functional layer 15.
- FIGS. 2 and 3 show the laminated glass interlayer film 30 of the second embodiment and the laminated glass 40 provided with the laminated glass interlayer film 30.
- the laminated glass interlayer film 30 of the second embodiment does not have a second thermoplastic resin layer, but includes a first thermoplastic resin layer 11 and an optical functional layer 15.
- the first thermoplastic resin layer 11 is arranged on one surface 15A side of the optical functional layer 15.
- the optical functional layer 15 is a layer formed on the base material 14, and therefore, the base material 14 is provided on the other surface 15B of the optical functional layer 15.
- the first thermoplastic resin layer 11 is adhered to the first glass plate 21, and the base material 14 of the optical functional layer 15 is adhered to the second glass plate 22.
- the base material 14 may be adhered to the second glass plate 22 via an adhesive or the like, but may be adhered to the second glass plate 22 by being pressure-bonded or the like.
- the base material 14 may be omitted, and the optical functional layer 15 may be directly laminated on the second glass plate 22.
- the optical functional layer 15 may be formed, for example, by applying the composition for the optical functional layer to the second glass plate 22.
- the optical functional layer 15 is formed smaller than the first thermoplastic resin layer 11 when viewed in a plan view, and the first thermoplastic resin layer is formed. It may be arranged so as to be buried in 11. In this case, the first thermoplastic resin layer 11 is adhered to the first glass plate 21 and also to the second glass 22 on the outer peripheral side of the optical functional layer 15, whereby the two glasses.
- the plates 21 and 22 may form a laminated glass structure.
- the thickness of the first thermoplastic resin layer 11 is the thickness of the optical functional layer 15. It means the thickness of the first thermoplastic resin layer 11 in the provided portion.
- the base material 14 may be provided on one surface 15A instead of being laminated on the other surface 15B of the optical functional layer 15, or the optical function may be provided.
- a cover material and a base material may be laminated on both sides of the layer 15.
- the interlayer films 10 and 30 for laminated glass in each of the above-described embodiments are merely examples, and may have any laminated structure as long as the effects of the present invention are exhibited, and other than the above. Layer may be appropriately provided.
- the interlayer film for laminated glass of the present invention is not particularly limited, but at least the first thermoplastic resin layer and the optical functional layer, or the first thermoplastic resin layer, the optical functional layer and the second thermoplastic resin layer are used. It can be manufactured by laminating and heat-bonding. At this time, a base material, a cover material, or the like may be appropriately attached to the optical functional layer. Further, laminated glass can also be produced in the same manner, and between the two glass plates, a first thermoplastic resin layer and an optical functional layer, or a first thermoplastic resin layer, an optical functional layer and a second thermoplastic resin layer can be produced. Can be manufactured by at least laminating and heat-bonding.
- an optical functional layer is directly formed on a glass plate for laminated glass, and a first thermoplastic resin layer or the like is laminated on the optical functional layer to form an interlayer film for laminated glass.
- Laminated glass may be manufactured.
- the method for producing the laminated glass interlayer film and the laminated glass is not limited to the above, and any method may be used as long as the laminated glass interlayer film and the laminated glass of the present invention can be produced.
- the present invention also provides an image display system including the above-mentioned laminated glass and a light source.
- the laminated glass is preferably a window glass
- the first glass plate is arranged on the outdoor side (outside the vehicle in the automobile) and the second glass plate is arranged on the indoor side (inside the vehicle in the automobile).
- the optical functional layer provided on the interlayer film for laminated glass is a volumetric hologram, and the hologram is formed by being exposed to interference light in advance, and image information is stored. Volumetric holograms are usually multiple-exposed, and a plurality of image information is recorded in a superimposed manner.
- the light source is a device that emits regenerated light.
- the regenerated light emitted from the light source irradiates the laminated glass.
- the regenerated light is irradiated to the laminated glass from the indoor side (that is, the inside of the vehicle), and the image information stored in the optical functional layer of the laminated glass is reproduced by the irradiated regenerated light.
- the reproduced image is generally displayed as a virtual image on the outdoor side (that is, the outside of the vehicle).
- the image reproduced from the indoor side inside the car
- the image display system of the present invention can be suitably used as an automobile HUD when the laminated glass is used as an automobile windshield.
- ⁇ YI the C-light XYZ color system YI before and after ultraviolet irradiation was calculated using a spectrophotometer (“U-4100” manufactured by Hitachi High-Tech) in accordance with JIS K7373.
- a spectrophotometer (“U-4100” manufactured by Hitachi High-Tech) was used to measure the tristimulus values of the laminated glass before and after irradiation with ultraviolet rays, and the brightness index and chromaticity index were calculated, and the hunter described in JIS Z8731.
- the color difference ⁇ E was obtained according to the color difference equation of.
- Porphyrin compound A compound represented by the formula (3-1), in which R 35 , R 36 , R 37 , and R 38 are coordinated to the para position, and represented by -COOCH 3 .
- Maximum absorption wavelength peak 415 nm The porphyrin compound was prepared by the following method. Tetraphenyl (4-carboxyphenyl) porphyrin tetramethyl ester (manufactured by Wako Pure Chemical Industries, Ltd.) 0.31 g (0.37 mmol) was dissolved in 50 mL of chloroform, and 2.11 g (15.5 mmol) of copper chloride was dissolved therein.
- the indole compound was prepared by the following method. To 120 ml of methanol, 23.5 g (0.10 mol) of 1-methyl-2-phenyl-1H-indole-3-carbaldehyde and 11.9 g (0.12 mol) of methyl cyanoacetate were added. Then, 2.5 g (0.03 mol) of piperidine was added, and the mixture was reacted under reflux for 6 hours to cool to room temperature, and then precipitated crystals were obtained. The obtained crystals were washed with a small amount of alcohol and then dried to obtain 30.9 g of pale yellow crystals of an indole compound having R 21 as a methyl group and R 22 as a methyl group in the above formula (2). The melting point of the obtained indole compound was 193.7 ° C., and the maximum absorption wavelength peak was 391 nm.
- Example 1 (Preparation of the first thermoplastic resin layer) A polyvinyl butyral resin, a plasticizer, and an ultraviolet absorber are mixed according to the formulation shown in Table 1, and the obtained thermoplastic resin composition is extruded by a twin-screw isotropic extruder to obtain a first 380 ⁇ m thick. A thermoplastic resin layer was prepared. When the above components were mixed, an aqueous magnesium organic acid solution as an adhesive force regulator was further added so that the Mg concentration in the first thermoplastic resin layer was 65 ppm. The concentration of Mg can be determined by measuring the Mg content with an ICP emission spectrometer (“ICPE-9000” manufactured by Shimadzu Corporation).
- ICP emission spectrometer (“ICPE-9000” manufactured by Shimadzu Corporation).
- thermoplastic resin layer A composition for an optical functional layer containing an acrylic monomer as a photoreactive monomer, polyurethane as a matrix polymer, a photopolymerization initiator, and a dye is applied to a TAC (cellulose triacetate) film having a thickness of 60 ⁇ m as a base material. And dried to obtain an optical functional layer having a thickness of 3 ⁇ m laminated on one surface of the substrate. Next, exposure was performed using a laser light source having a wavelength of 532 nm, and a photoreactive monomer was reacted and polymerized. At the time of exposure, an optical functional layer having a hologram was obtained by interfering light waves from two directions on the optical functional layer.
- second thermoplastic resin layer A second thermoplastic resin layer was prepared in the same manner as the first thermoplastic resin layer, except that the blending amount of the ultraviolet absorber was changed as shown in Table 1.
- thermoplastic resin layers were kept at a constant temperature and humidity of 23 ° C. and a relative humidity of 28% for 4 hours. After that, two transparent clear glass plates (thickness 2.5 mm) are prepared, and a second thermoplastic resin layer, an optical functional layer with a base material, and a first thermoplastic are placed on one of the clear glass plates. The resin layer and the other clear glass plate were laminated in this order to form a laminate.
- the obtained laminate is transferred into a rubber bag, the rubber bag is connected to a suction decompression system, heated at the outside air heating temperature, and at the same time held under a reduced pressure of -600 mmHg (absolute pressure 160 mmHg) for 10 minutes to bring the temperature of the laminate After heating to 60 ° C. (preliminary crimping temperature), the pressure was returned to atmospheric pressure to perform temporary crimping.
- the temporarily crimped laminate was held in an autoclave under the conditions of a temperature of 140 ° C. and a pressure of 1.3 MPa for 10 minutes, and then the temperature was lowered to 50 ° C. and returned to atmospheric pressure to complete the main crimping. I got a glass.
- the laminated glass had a layer structure of a first glass plate / a first thermoplastic resin layer / an optical functional layer / a base material / a second thermoplastic resin layer / a second glass plate.
- Examples 2 to 5 Comparative Examples 1 and 2
- the same procedure as in Example 1 was carried out except that the types and amounts of the ultraviolet absorbers blended in the first thermoplastic resin layer were changed as shown in Table 1.
- Comparative Example 1 no ultraviolet absorber was added to the first thermoplastic resin layer.
Abstract
Description
しかし、体積型ホログラムを有する合わせガラスは、特許文献1、2のように一般的な紫外線吸収層を設けても、太陽光が長期間照射されることで劣化するという不具合が生じる。
[1]光学機能層と、前記光学機能層の一方の面側に設けられる第1の熱可塑性樹脂層とを備え、
前記光学機能層が光反応性モノマーの重合体、及びマトリックスポリマーを含み、
前記第1の熱可塑性樹脂層が紫外線吸収剤を含み、かつ波長400nmにおける透過率が20%以下である合わせガラス用中間膜。
[2]前記第1の熱可塑性樹脂層の波長410nmにおける透過率が60%以下である上記[1]に記載の合わせガラス用中間膜。
[3]前記第1の熱可塑性樹脂層の波長420nmにおける透過率が70%以下である上記[1]又は[2]に記載の合わせガラス用中間膜。
[4]前記紫外線吸収剤がベンゾトリアゾール化合物、インドール系化合物、及びポルフィリン化合物からなる群から選択される少なくとも1種である上記[1]~[3]のいずれか1項に記載の合わせガラス用中間膜。
[5]前記紫外線吸収剤が、ベンゾトリアゾール化合物と、インドール系化合物及びポルフィリン化合物からなる群から選択される少なくとも1種とを含む上記[4]に記載の合わせガラス用中間膜。
[6]前記光学機能層の他方の面側に設けられる第2の熱可塑性樹脂層をさらに備える上記[1]~[5]のいずれか1項に記載の合わせガラス用中間膜。
[7]前記第2の熱可塑性樹脂層の波長400nmにおける透過率をT400(2)、前記第1の熱可塑性樹脂層の波長400nmにおける透過率をT400(1)とした場合に、T400(2)>T400(1)の関係を満たす上記[6]に記載の合わせガラス用中間膜。
[8]前記第2の熱可塑性樹脂層の波長410nmにおける透過率をT410(2)、前記第1の熱可塑性樹脂層の波長410nmにおける透過率をT410(1)とした場合に、T410(2)>T410(1)の関係を満たす上記[6]又は[7]に記載の合わせガラス用中間膜。
[9]前記第2の熱可塑性樹脂層の波長420nmにおける透過率をT420(2)、前記第1の熱可塑性樹脂層の波長420nmにおける透過率をT420(1)とした場合に、T420(2)>T420(1)の関係を満たす上記[6]~[8]のいずれか1項に記載の合わせガラス用中間膜。
[10]前記光学機能層が光重合開始剤を含有する上記[1]~[9]のいずれか1項に記載の合わせガラス用中間膜。
[11]上記[1]~[10]のいずれか1項に記載の合わせガラス用中間膜と、一対のガラス板を備え、前記一対のガラス板の間に合わせガラス用中間膜が配置される合わせガラス。
本発明の合わせガラス用中間膜は、光学機能層と、光学機能層の一方の面側に設けられる第1の熱可塑性樹脂層とを備える。また、本発明の合わせガラス用中間膜は、光学機能層の他方の面側に設けられる第2の熱可塑性樹脂層をさらに備えることが好ましい。
合わせガラス用中間膜は、後述するように例えば室外窓の窓ガラスに使用される場合には、第1の熱可塑性樹脂層が光学機能層よりも屋外側に配置される。また、第2の熱可塑性樹脂層は、光学機能層よりも屋内側に配置される。
以下、本発明の合わせガラス用中間膜を構成する各部材についてより詳細に説明する。
本発明で使用する光学機能層は、光反応性モノマーの重合体、及びマトリックスポリマーを含む。光学機能層は、これらの成分を含有することで、体積型ホログラムを構成する。すなわち、光学機能層は、干渉光により露光され光反応性モノマーを重合させることで、画像情報を記録できる。より具体的には、干渉光の強弱により、光反応性モノマーや光反応性モノマーの重合体の疎密ができ、それらとマトリックスポリマーの屈折率差によりホログラムが形成され、画像情報が記録される。画像情報が記録された光学機能層は、再生光が照射されることで記録された画像を再生できる。したがって、光学機能層には、一般的には光反応性モノマーの重合体に加えて、光反応性モノマーも存在する。
光反応性モノマーとしては、少なくとも一つのエチレン性不飽和二重結合を有し、干渉光により露光されて重合可能なものである。光反応性モノマーは、比較的高屈折率を呈するものが好ましい。光反応性モノマーとしては、好ましくはアクリル系モノマーが使用される。アクリル系モノマーは、アクリロイル基及びメタクリロイル基のいずれかを有するモノマーである。
また、アクリル系モノマーとしては、9,9-ジアリールフルオレン骨格を有し、分子中に少なくとも一つの(メタ)アクリロイル基を有するものや、ウレタンアクリレートなどでもよい。ウレタンアクリレートとしては、フェニルイソシアネート化合物と、一分子中にヒドロキシ基及び(メタ)アクリロイル基を有する化合物との縮合物からなるものが挙げられる。
また、スチレン、メトキシスチレン、2-クロロスチレン、2-ブロモスチレン、N-ビニルカルバゾール、フェニルマレイミド、2-ビニルナフタレンなどのアクリル系モノマー以外の光反応性モノマーでもよい。
光反応性モノマーは、1種単独でも又は2種以上を組み合わせても用いることができる。光学機能層における光反応性モノマーの含有量は、例えば、10~50質量%の範囲内であることが好ましい。
マトリクスポリマーとしては、例えば、ポリビニルアセテート(ポリ酢酸ビニル)、ポリビニルブチラート、ポリビニルホルマール、ポリビニルカルバゾール、ポリアクリル酸、ポリメタクリル酸、ポリメチルアクリレート、ポリメチルメタクリレート、ポリエチルアクリレート、ポリブチルアクリレート、ポリメタクリロニトリル、ポリエチルメタクリレート、ポリブチルメタクリレート、ポリアクリロニトリル、ポリ-1,2-ジクロロエチレン、エチレン-酢酸ビニル共重合体、テトラフルオロエチレン-酢酸ビニル共重合体、シンジオタクチック型ポリメチルメタクリレート、ポリ-α-ビニルナフタレート、ポリカーボネート、セルロースアセテート、セルローストリアセテート、セルロースアセテートブチラート、ポリスチレン、ポリ-α-メチルスチレン、ポリ-o-メチルスチレン、ポリ-p-メチルスチレン、ポリ-p-フェニルスチレン、ポリ-2,5-ジクロロスチレン、ポリ-p-クロロスチレン、ポリアリレート、ポリスルホン、ポリエーテルスルホン、スチレン-アクリロニトリル共重合体、スチレン-ジビニルベンゼン共重合体、スチレン-ブタジエン共重合体、スチレン-無水マレイン酸共重合体、ABS樹脂、ポリエチレン、ポリ塩化ビニル、ポリプロピレン、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリビニルピロリドン、ポリ塩化ビニリデン、水素化スチレン-ブタジエン-スチレン共重合体、ポリウレタン、ポリテトラフルオロエチレン、ポリフッ化ビニリデンなどが挙げられる。また、テトラフルオロエチレンやヘキサフルオロエチレン等とビニルアルコール、ビニルエステル、ビニルエーテル、ビニルアセタール、ビニルブチラール等との共重合体などでもよいし、(メタ)アクリル酸環状脂肪族エステルとメチル(メタ)アクリレートとの共重合体、メチルメタクリレート-エチルアクリレート-アクリル酸共重合体等でもよい。これらのなかでは、ポリウレタンが好ましい。
光学機能層におけるマトリックスポリマーの含有量は、例えば、30~80質量%の範囲内である。
光学機能層は、光重合開始剤を含有することが好ましい。光重合開始剤としては、公知の光重合開始剤が使用可能であり、ヨードニウム塩類、トリアジン系化合物、アゾ化合物、アジド化合物、有機過酸化物、有機ホウ素酸塩、オニウム塩類、ハロゲン化炭化水素誘導体、チタノセン化合物、アシルホスフィンオキサイド、ビスアシルホスフィンオキサイドとα-ヒドロキシケトンとの組み合わせ等が挙げられる。また、チオール化合物等の水素供与体とビスイミダゾール誘導体との併用によるラジカル重合開始剤システムも利用できる。
また、光重合開始剤は、単分子タイプでもよいし、二分子タイプを使用してもよい。単分子タイプは、光重合開始剤単独で重合を開始させるものであり、例えば、干渉光の照射により単分子の結合が開裂してフリーラジカルを生成する。また、二分子タイプでは、光学機能層が染料などの色素をさらに含む。二分子タイプは、重合開始剤と色素により重合を開始させる。二分子タイプでは、例えば、染料などの色素が光子を吸収し、励起状態から光重合開始剤(共開始剤)へエネルギーを伝達するとともに、光重合開始剤が、電子又はプロトンの移動或いは直接の水素抜き取りによって重合誘発フリーラジカルを放出する。共開始剤としては、例えばアルキルアリールホウ酸アンモニウムなどが使用される。
光学機能層における光重合開始剤の含有量は、例えば、0.1~5質量%の範囲内であることが好ましい。
また、光学機能層は、上記以外にも連鎖移動剤など体積型ホログラムに使用される公知の添加剤が適宜配合されていてもよい。
光学機能層の厚さは、特に限定されないが、例えば0.1~50μm、好ましくは1~10μmである。
光学機能層が形成される基材の厚さは例えば10~200μm、好ましくは40~100μmである。
また、基材上に形成された光学機能層には、さらにカバー材が積層され、光学機能層の両面が、基材及びカバー材それぞれによって被覆されてもよい。これにより、光学機能層は保護されやすくなる。
ただし、光学機能層は、必ずしも基材上に形成される必要はなく、例えば第1の熱可塑性樹脂層や、第2の熱可塑性樹脂層に直接積層されてもよい。また、後述する合わせガラスを構成するガラス板上に直接積層されてもよい。
光学機能層の作製においては、まず、光反応性モノマー、マトリックスポリマー、及び必要に応じて配合される光重合開始剤、色素、連鎖移動剤などのその他の添加剤を含む光学機能層用組成物を用意する。光学機能層用組成物は適宜溶媒によって希釈されてもよい。光学機能層用組成物は、基材や剥離シートなどに塗布し、必要に応じて乾燥することで、光学機能層を形成するとよい。
また、マトリックスポリマーがポリウレタンなどの熱硬化性樹脂である場合には、マトリックスポリマーの前駆体成分(例えば、ポリウレタンであれば、ポリオールとポリイソシアネート)と、光反応性モノマーと、必要に応じて任意で配合される光重合開始剤、色素、連鎖移動剤などのその他の添加剤とを含む光学機能層用組成物を用意してもよい。その場合には、光学機能層用組成物は、基材や剥離シートなどに塗布した後、前駆体成分を硬化させるとよい。この場合も、塗布された光学機能層用組成物は、必要に応じて適宜乾燥されるとよい。
上記光学機能層は、露光し、光反応性モノマーを反応させることで光反応性モノマーの少なくとも一部を重合体とする。その際、2種類の光の波を干渉させることにより、ホログラムを形成する。
なお、剥離シート上でホログラムが形成された光学機能層は、剥離シートから剥がされて、第1の熱可塑性樹脂層、第2の熱可塑性樹脂層、又はガラス板などに積層されるとよい。
また、光学機能層は、基材又は剥離シートの代わりに、合わせガラスを構成するガラス板に光学機能層用組成物を直接塗布して形成してもよい。
第1の熱可塑性樹脂層は、紫外線吸収剤を含み、かつ波長400nmにおける透過率が20%以下となるものである。本発明では、合わせガラス用中間膜が、このような第1の熱可塑性樹脂層を有することで、太陽光などが長期間照射されても光学機能層が光劣化することを防ぎ、耐光性を改善できる。
その原理は定かではないが、上記した光学機能層は、意外なことに400nm付近の光線によって劣化しやすい一方で、通常の紫外線吸収層は400nm付近の吸収率がそれほど低くない。そのため、本発明では、波長400nmにおける透過率を低く制御することで、従来の紫外線吸収層を使用した場合に比べて耐光性が改善していると推定される。
また、第1の熱可塑性樹脂層は、波長420nmにおける透過率が70%以下であることが好ましい。光学機能層は、420nm付近の光線によっても光劣化することがあるが、420nmにおける透過率を70%以下とすることで、光学機能層の光劣化を効果的に防止できる。
さらに、第1の熱可塑性樹脂層は、波長410nmにおける透過率が60%以下となり、かつ波長420nmにおける透過率が70%以下となることがより好ましい。波長410、420nmの両方の透過率が一定値以下となることで、より一層効果的に光学機能層の光劣化を防止できる。
また、第1の熱可塑性樹脂層の410nmにおける透過率は、特に限定されないが、例えば1%以上、好ましくは5%以上、より好ましくは10%以上、さらに好ましくは15%以上である。410nmにおける透過率をこれら下限値以上とすることで、可視光線透過率が低下したり、合わせガラス用中間膜に色付きが発生したりすることを防止する。
また、第1の熱可塑性樹脂層の420nmにおける透過率は、特に限定されないが、例えば1%以上、好ましくは7%以上、より好ましくは15%以上である。420nmにおける透過率をこれら下限値以上とすることで、可視光線透過率が低下したり、合わせガラス用中間膜に色付きが発生したりすることを防止する。
第1の熱可塑性樹脂層は、紫外線吸収剤を含有する。第1の熱可塑性樹脂層は、紫外線吸収剤を含有することで、光学機能層及び第1の熱可塑性樹脂層が太陽光などにより光劣化することを防止できる。また、合わせガラス用中間膜を含む合わせガラスを例えば窓ガラスとして使用する場合には、窓ガラスを介して紫外線が屋内側に透過することを防止できる。
紫外線吸収剤としては、ベンゾトリアゾール化合物、インドール系化合物、及びポルフィリン化合物が挙げられる。これらは1種単独で使用してよいし、2種以上を併用してもよい。本発明では、使用する紫外線吸収剤の種類と、配合量を調整することで、上記したように400~420nmにおける透過率を所定の範囲内に調整できる。
紫外線吸収剤として使用されるベンゾトリアゾール化合物は、ベンゾトリアゾール骨格を有し、紫外線を吸収することが可能な化合物である。ベンゾトリアゾール化合物は、例えば300~390nm、好ましくは330~375nm、より好ましくは345~360nmの波長領域に最大吸収波長ピークを有する化合物が挙げられる。
(式(1)において、R11は、水素原子、炭素数が1~8のアルキル基、又は炭素数4~20のアルコキシカルボニルアルキル基を表し、R12は、水素原子、又は炭素数が1~8のアルキル基を表す。Xは塩素原子又は水素原子である。)
また、式(1)で示される化合物の具体例としては、2-(3-t-ブチル-5-メチル-2-ヒドロキシフェニル)-5-クロロベンゾトリアゾール、2-(3,5-ジ-t-ブチル-2-ヒドロキシフェニル)-5-クロロベンゾトリアゾール、3-[3-tert-ブチル-5-(5-クロロ-2H-ベンゾトリアゾール-2-イル)-4-ヒドロキシフェニル]プロピオン酸オクチル、3-(5-クロロ-2H-ベンゾトリアゾール-2-イル)-5-(1,1-ジメチルエチル)-4-ヒドロキシフェニルプロピオン酸メチル、2-(3,5-ジ-tert-アミル-2-ヒドロキシフェニル)ベンゾトリアゾールなどが挙げられる。
式(1)で示される化合物は、好ましくは330~375nm、より好ましくは345~360nmの波長領域に最大吸収波長ピークを有する化合物である。
インドール系化合物は、インドール骨格を有し、紫外線を吸収することが可能な化合物である。インドール系化合物としては、好ましくは以下の式(2)で表される化合物が挙げられる。
式(2)において、R21は、炭素数が1~3のアルキル基を表し、R22は、水素原子、炭素数が1~10のアルキル基、又は、炭素数が7~10のアラルキル基を表す。
式(2)におけるR22は、炭素数が1~10のアルキル基であることが好ましく、炭素数が1~8のアルキル基であることがより好ましい。炭素数が1~10のアルキル基としては、例えば、メチル基、エチル基、イソプロピル基、n-プロピル基、イソブチル基、n-ブチル基、ペンチル基、ヘキシル基、2-エチルヘキシル基、n-オクチル基等が挙げられる。また、炭素数が7~10のアラルキル基として、例えば、ベンジル基、フェニルエチル基、フェニルプロピル基、フェニルブチル基等が挙げられる。
インドール系化合物は、特に限定されないが、最大吸収波長ピークが例えば375~405nm、好ましくは380~400nm、より好ましく385~395nmである。
本発明で使用するポルフィリン化合物は、ポルフィリン骨格を有し、紫外線を吸収することが可能な化合物である。ポルフィリン化合物は、最大吸収波長ピークが、例えば380~430nm、好ましくは390~425nm、より好ましく400~420nmである。
ポルフィリン化合物の具体例としては、以下の式(3)で示される化合物が挙げられる。
式(3)において、R31~R34は、それぞれ独立に、水素原子、又はヘテロ原子を有してもよい炭化水素基である。Mとしては、銅、マグネシウム、コバルト、亜鉛、マンガン、鉄などの金属原子が挙げられ、中でも銅、マンガン、鉄、コバルトが好ましく、銅がより好ましい。ここで、R31~R34の炭素数は、それぞれ独立に1~24であり、好ましくは1~18、より好ましくは6~12である。ヘテロ原子としては、窒素原子、硫黄原子、酸素原子、ハロゲン原子などが挙げられる。
ここで、置換基は、電子吸引性を有する置換基が好ましい。置換基の具体例としては、塩素原子、臭素原子、フッ素原子、ヨウ素原子などのハロゲン原子、カルボキシル基(-COOH)、ニトリル基(-CN),ニトロ基(-NO2)、アルデヒド基(-CHO)、エステル基(-COOR)などが挙げられる。なお、エステル基におけるRは、例えば炭素数1~6のアルキル基、好ましくは炭素数1~4のアルキル基、より好ましくは炭素数1~2のアルキル基である。置換基としては、エステル基が好ましい。
また、芳香族環としては、ベンゼン環、ナフタレン環、フェナントレン環、アントラセン環などが挙げられる。芳香族環は、ベンゼン環とともに5員環又は6員環を形成する複素環が設けられた、ベンゼン環を含む多環であってもよい。複素環を構成するヘテロ原子は、窒素原子、酸素原子、硫黄原子が挙げられる。芳香族環は、好ましくはベンゼン環である。芳香族環は、単結合により、ポルフィリン骨格に直接結合すればよい。
式(3-1)において、R35~R38は、それぞれ独立に上記した置換基であり、中でもエステル基が好ましい。また、R35~R38の位置は、オルト、メタ、パラ位のいずれでもよいが、製造容易性の観点からは、パラ位が好ましい。
また、第1の熱可塑性樹脂層における紫外線吸収剤の含有量は、熱可塑性樹脂100質量部に対して、好ましくは2.0質量部以下、より好ましくは1.5質量部以下、さらに好ましくは1.0質量部以下である。これら上限値以下とすることで、紫外線吸収剤により、第1の熱可塑性樹脂層に色味がついたりすること防止できる。また、紫外線吸収剤を熱可塑性樹脂に適切に分散ないし溶解でき、含有量に見合った効果を発揮しやすくなる。
なお、紫外線吸収剤の含有量とは、紫外線吸収剤が2種以上含有される場合には、それらの合計含有量である。
第1の熱可塑性樹脂層におけるベンゾトリアゾール化合物の含有量は、熱可塑性樹脂100質量部に対して、0.15質量部以上が好ましく、0.2質量部以上がより好ましく、0.4質量部以上がさらに好ましく、0.6質量部以上が特に好ましい。また、1.5質量部以下が好ましく、1.0質量部以下がより好ましい。
単独で使用する場合のベンゾトリアゾール化合物の含有量は、熱可塑性樹脂100質量部に対して、0.35質量部以上が好ましく、0.4質量部以上がより好ましく、0.7質量部以上がさらに好ましく、また、1.5質量部以下が好ましく、1.0質量部以下がより好ましい。
ベンゾトリアゾール化合物と、インドール系化合物又はポルフィリン化合物とを併用することで、380nm以下の波長領域における紫外線を適切に吸収しつつ、400、410、420nmにおける透過率も低くなり、光学機能層の光劣化をより効果的に防止できる。さらに、420nmより高波長の光を十分に透過させて、可視光領域の透過率を高くしやすくなる。
ここで、低波長側紫外線吸収剤は、例えば、300~380nm、好ましくは330~375nm、より好ましくは345~360nmの波長領域に最大吸収波長ピークを有する化合物である。低波長側紫外線吸収剤は、例えば上記したベンゾトリアゾール化合物であり、好ましくは上記した式(1)で表される化合物である。
また、高波長側紫外線吸収剤は、例えば380~430nm、好ましくは390~425nm、より好ましくは400~420nmである。高波長側紫外線吸収剤は、例えば上記したインドール化合物及びポルフィリン化合物から選択される少なくとも1種であり、好ましくは式(2)で表される化合物及び式(3)で表される化合物から選択される少なくとも1種である。
また、長波長側紫外線吸収剤の含有量は、熱可塑性樹脂100質量部に対して、0.001質量部以上が好ましく、0.002質量部以上がより好ましく、0.003質量部以上がさらに好ましく、また、0.5質量部以下が好ましく、0.3質量部以下がより好ましく、0.1質量部以下がさらに好ましく、0.03質量部以下がよりさらに好ましい。これらの含有量を上記下限値以上とすることで、400、410、420nmにおける透過率を低くしやすくなる。また、上記上限値以下とすることで、紫外線吸収剤により、第1の熱可塑性樹脂層に色味がついたりすること防止でき、かつ含有量に見合った効果を発揮しやすくなる。
第1の熱可塑性樹脂層は、熱可塑性樹脂を含有する。第1の熱可塑性樹脂層は、熱可塑性樹脂を含有することで、接着層としての機能を果たしやすくなり、光学機能層や、ガラス板などとの接着性が良好になる。
熱可塑性樹脂としては、特に限定されないが、例えば、ポリビニルアセタール樹脂、エチレン-酢酸ビニル共重合体樹脂、アイオノマー樹脂、ポリウレタン樹脂、及び熱可塑性エラストマーなどが挙げられる。これら樹脂を使用することで、ガラス板との接着性を確保しやすくなる。第1の熱可塑性樹脂層において熱可塑性樹脂は、1種単独で使用してもよいし、2種以上を併用してもよい。これらの中では、ポリビニルアセタール樹脂及びエチレン-酢酸ビニル共重合体樹脂から選択される少なくとも1種が好ましく、特に、可塑剤と併用した場合に、ガラス板に対して優れた接着性を発揮する点から、ポリビニルアセタール樹脂がより好ましい。
ポリビニルアセタール樹脂は、ポリビニルアルコールをアルデヒドでアセタール化して得られるポリビニルアセタール樹脂であれば特に限定されないが、ポリビニルブチラール樹脂が好適である。
上記ポリビニルアセタール樹脂のアセタール化度の好ましい下限は40モル%、好ましい上限は85モル%であり、より好ましい下限は60モル%、より好ましい上限は75モル%である。
ポリビニルアセタール樹脂としてポリビニルブチラール樹脂を用いる場合も、同様の観点から、水酸基量の好ましい下限は15モル%、好ましい上限は35モル%であり、より好ましい下限は25モル%、より好ましい上限は33モル%である。
なお、上記アセタール化度及び上記水酸基量は、例えば、JIS K6728「ポリビニルブチラール試験方法」に準拠した方法により測定することができる。
ポリビニルアセタール樹脂の重合度の好ましい下限は500、好ましい上限は4000である。重合度を500以上することで、合わせガラスの耐貫通性が良好になる。また、重合度を4000以下とすることで、合わせガラスの成形がしやすくなる。重合度のより好ましい下限は1000、より好ましい上限は3600である。
エチレン-酢酸ビニル共重合体樹脂としては、非架橋型のエチレン-酢酸ビニル共重合体樹脂であってもよいし、また、高温架橋型のエチレン-酢酸ビニル共重合体樹脂であってもよい。また、エチレン-酢酸ビニル共重合体樹脂としては、エチレン-酢酸ビニル共重合体けん化物、エチレン-酢酸ビニルの加水分解物などのようなエチレン-酢酸ビニル変性体樹脂も用いることができる。
アイオノマー樹脂としては、特に限定はなく、様々なアイオノマー樹脂を用いることができる。具体的には、エチレン系アイオノマー、スチレン系アイオノマー、パーフルオロカーボン系アイオノマー、テレケリックアイオノマー、ポリウレタンアイオノマー等が挙げられる。これらの中では、合わせガラスの機械強度、耐久性、透明性などが良好になる点、ガラスへの接着性に優れる点から、エチレン系アイオノマーが好ましい。
不飽和カルボン酸としては、アクリル酸、メタクリル酸、マレイン酸等が挙げられ、アクリル酸、メタクリル酸が好ましく、メタクリル酸が特に好ましい。また、他のモノマーとしては、アクリル酸エステル、メタクリル酸エステル、1-ブテン等が挙げられる。
エチレン・不飽和カルボン酸共重合体としては、該共重合体が有する全構成単位を100モル%とすると、エチレン由来の構成単位を75~99モル%有することが好ましく、不飽和カルボン酸由来の構成単位を1~25モル%有することが好ましい。
エチレン・不飽和カルボン酸共重合体のアイオノマーは、エチレン・不飽和カルボン酸共重合体が有するカルボキシル基の少なくとも一部を金属イオンで中和または架橋することにより得られるアイオノマー樹脂であるが、該カルボキシル基の中和度は、通常は1~90%であり、好ましくは5~85%である。
ポリウレタン樹脂としては、イソシアネート化合物と、ジオール化合物とを反応して得られるポリウレタン、イソシアネート化合物と、ジオール化合物、さらに、ポリアミンなどの鎖長延長剤を反応させることにより得られるポリウレタンなどが挙げられる。また、ポリウレタン樹脂は、硫黄原子を含有するものでもよい。その場合には、上記ジオールの一部又は全部を、ポリチオール及び含硫黄ポリオールから選択されるものとするとよい。ポリウレタン樹脂は、有機ガラスとの接着性を良好にすることができる。そのため、ガラス板が有機ガラスである場合に好適に使用される。
熱可塑性エラストマーとしては、スチレン系熱可塑性エラストマー、脂肪族ポリオレフィンが挙げられる。スチレン系熱可塑性エラストマーとしては、特に限定されず、公知のものを用いることができる。スチレン系熱可塑性エラストマーは、一般的に、ハードセグメントとなるスチレンモノマー重合体ブロックと、ソフトセグメントとなる共役ジエン化合物重合体ブロック又はその水添ブロックとを有する。スチレン系熱可塑性エラストマーの具体例としては、スチレン-イソプレンジブロック共重合体、スチレン-ブタジエンジブロック共重合体、スチレン-イソプレン-スチレントリブロック共重合体、スチレン-ブタジエン/イソプレン-スチレントリブロック共重合体、スチレン-ブタジエン-スチレントリブロック共重合体、並びにその水素添加体が挙げられる。
上記脂肪族ポリオレフィンは、飽和脂肪族ポリオレフィンであってもよく、不飽和脂肪族ポリオレフィンであってもよい。上記脂肪族ポリオレフィンは、鎖状オレフィンをモノマーとするポリオレフィンであってもよく、環状オレフィンをモノマーとするポリオレフィンであってもよい。中間膜の保存安定性、及び、遮音性を効果的に高める観点からは、上記脂肪族ポリオレフィンは、飽和脂肪族ポリオレフィンであることが好ましい。
上記脂肪族ポリオレフィンの材料としては、エチレン、プロピレン、1-ブテン、trans-2-ブテン、cis-2-ブテン、1-ペンテン、trans-2-ペンテン、cis-2-ペンテン、1-ヘキセン、trans-2-ヘキセン、cis-2-ヘキセン、trans-3-ヘキセン、cis-3-ヘキセン、1-ヘプテン、trans-2-ヘプテン、cis-2-ヘプテン、trans-3-ヘプテン、cis-3-ヘプテン、1-オクテン、trans-2-オクテン、cis-2-オクテン、trans-3-オクテン、cis-3-オクテン、trans-4-オクテン、cis-4-オクテン、1-ノネン、trans-2-ノネン、cis-2-ノネン、trans-3-ノネン、cis-3-ノネン、trans-4-ノネン、cis-4-ノネン、1-デセン、trans-2-デセン、cis-2-デセン、trans-3-デセン、cis-3-デセン、trans-4-デセン、cis-4-デセン、trans-5-デセン、cis-5-デセン、4-メチル-1-ペンテン、及びビニルシクロヘキサン等が挙げられる。
第1の熱可塑性樹脂層は、さらに可塑剤を含有してもよい。第1の熱可塑性樹脂層は、可塑剤を含有することにより柔軟となり、その結果、合わせガラスを柔軟にする。さらには、ガラス板に対する高い接着性を発揮することも可能になる。第1の熱可塑性樹脂層は、熱可塑性樹脂としてポリビニルアセタール樹脂を使用する場合に、可塑剤を含有すると特に効果的である。
可塑剤としては、例えば、一塩基性有機酸エステル及び多塩基性有機酸エステル等の有機エステル可塑剤、並びに有機リン酸可塑剤及び有機亜リン酸可塑剤などのリン酸可塑剤等が挙げられる。なかでも、有機エステル可塑剤が好ましい。
上記可塑剤のなかでも、トリエチレングリコール-ジ-2-エチルヘキサノエート(3GO)が特に好適に用いられる。
また、第1の熱可塑性樹脂層は、熱可塑性樹脂、又は熱可塑性樹脂及び可塑剤が主成分となるものであり、熱可塑性樹脂及び可塑剤の合計量が、第1の熱可塑性樹脂層全量基準で、通常70質量%以上、好ましくは80質量%以上、さらに好ましくは90質量%以上である。
第1の熱可塑性樹脂層は、更に必要に応じて、赤外線吸収剤、酸化防止剤、光安定剤、接着力調整剤、顔料、染料、蛍光増白剤、結晶核剤等の添加剤を含有してもよい。
赤外線吸収剤は、赤外線を遮蔽する性能を有すれば特に限定されないが、例えば、錫ドープ酸化インジウム粒子が好適である。第1の熱可塑性樹脂層は、赤外線吸収剤を含有することにより、高い遮熱性を発揮することができる。
酸化防止剤は、特に限定されず、例えば、2,2-ビス[[[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオニル]オキシ]メチル]プロパン-1,3-ジオール1,3-ビス[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオナート]、4,4’-チオビス(6-tert-ブチル-3-メチルフェノール)、4,4’-ジメチル-6,6’-ジ(tert-ブチル)[2,2’-メチレンビス(フェノール)]、2,6-ジ-t-ブチル-p-クレゾール、4,4’-ブチリデンビス-(6-t-ブチル-3-メチルフェノール)等が挙げられる。
また、結晶核剤としては、特に限定されるものではないが、例えば、ジベンジリデンソルビトール、ジベンジリデンキシリトール、ジベンジリデンズルシトール、ジベンジリデンマンニトール、カリックスアレーンが挙げられる。結晶核剤は、熱可塑性樹脂としては、エチレン-酢酸ビニル共重合体樹脂が使用される場合、好適に使用される。
接着力調整剤としては、例えば各種のマグネシウム塩又はカリウム塩などが使用される。
本発明の合わせガラス用中間膜は、光学機能層の他方の面側に第2の熱可塑性樹脂層をさらに備えることが好ましい。第2の熱可塑性樹脂層を有することで、光学機能層を有する合わせガラス用中間膜を、合わせガラスを構成する2枚のガラス板に容易に接着させることができる。
そのような観点から、波長400nmにおける第1及び第2の熱可塑性樹脂層の透過率の差(T400(2)-T400(1))は、5%以上が好ましく、10%以上がより好ましく、15%以上がさらに好ましく、25%以上がよりさらに好ましい。
また、差(T400(2)-T400(1))は、特に限定されないが、例えば60%以下であってもよいが、50%以下であってもよい。
なお、第2の熱可塑性樹脂層の波長400nmにおける透過率(T400(2))は、特に限定されないが、例えば20%以上、好ましくは30%以上であり、また、例えば80%以下、好ましくは60%以下である。
可視光線透過率を高くし、色付きを防止しやすくする観点から、波長410nmにおける第1及び第2の熱可塑性樹脂層の透過率の差(T410(2)-T410(1))は、5%以上が好ましく、10%以上がより好ましく、20%以上がさらに好ましく、30%以上がよりさらに好ましい。また、差(T410(2)-T410(1))は、特に限定されないが、例えば70%以下であってもよいが、60%以下であってもよい。
なお、第2の熱可塑性樹脂層の波長410nmにおける透過率(T410(2))は、特に限定されないが、例えば40%以上、好ましくは50%以上であり、また、例えば95%以下、好ましくは80%以下である。
可視光線透過率を高くし、色付きを防止しやすくする観点から、波長420nmにおける第1及び第2の熱可塑性樹脂層の透過率の差(T420(2)-T420(1))は、3%以上が好ましく、5%以上がより好ましく、20%以上がさらに好ましく、25%以上がよりさらに好ましい。
また、差(T420(2)-T420(1))は、特に限定されないが、例えば80%以下であってもよいが、70%以下であってもよい。
なお、第2の熱可塑性樹脂層の波長420nmにおける透過率(T420(2))は、特に限定されないが、例えば45%以上、好ましくは55%以上であり、また、例えば95%以下、好ましくは90%以下である。
なお、ポリビニルアセタール樹脂、エチレン-酢酸ビニル共重合体樹脂、アイオノマー樹脂、ポリウレタン樹脂、及び熱可塑性エラストマーの詳細は、第1の熱可塑性樹脂層において説明したとおりであるので、その説明は省略する。
可塑剤としては、例えば、一塩基性有機酸エステル及び多塩基性有機酸エステル等の有機エステル可塑剤、並びに有機リン酸可塑剤及び有機亜リン酸可塑剤などのリン酸可塑剤等が挙げられる。可塑剤の具体例は上記のとおりである。これらのなかでも、有機エステル可塑剤が好ましく、トリエチレングリコール-ジ-2-エチルヘキサノエート(3GO)が特に好適に用いられる。第2の熱可塑性樹脂層においても、可塑剤は、1種単独で使用してもよいし、2種以上を併用してもよい。
また、第2の熱可塑性樹脂層は、熱可塑性樹脂、又は熱可塑性樹脂及び可塑剤が主成分となるものであり、熱可塑性樹脂及び可塑剤の合計量が、第2の熱可塑性樹脂全量基準で、通常70質量%以上、好ましくは80質量%以上、さらに好ましくは90質量%以上である。
紫外線吸収剤としては、特に限定されず、公知の紫外線吸収剤を使用すればよいが、上記した紫外線吸収剤を使用すればよく、好ましくはベンゾトリアゾール化合物を使用する。ベンゾトリアゾール化合物を使用することで、紫外線吸収剤によって太陽光に含まれる紫外線を効果的に吸収することができる。なお、ベンゾトリアゾール化合物の詳細は上記したとおりであり、好ましくは上記した式(1)で示されるベンゾトリアゾール化合物が使用される。
第2の熱可塑性樹脂層において、紫外線吸収剤は、1種単独で使用してもよいし、2種以上を併用してもよい。
第2の熱可塑性樹脂層における紫外線吸収剤は、例えば330~390nm、好ましくは330~375nm、より好ましくは345~360nmの波長領域に最大吸収波長ピークを有する化合物である。このような化合物を使用することで、紫外線吸収剤によって太陽光に含まれる紫外線を効果的に吸収できる。
具体的な第2の熱可塑性樹脂層における紫外線吸収剤の含有量は、熱可塑性樹脂100質量部に対して、例えば0.02質量部以上が好ましく、0.10質量部以上がより好ましく、0.15質量部以上がさらに好ましく、また、1.0質量部以下が好ましく、0.5質量部以下がより好ましく、0.4質量部以下がさらに好ましい。
第2の熱可塑性樹脂層は、更に必要に応じて、赤外線吸収剤、酸化防止剤、光安定剤、接着力調整剤、顔料、染料、蛍光増白剤、結晶核剤等の添加剤を含有してもよい。これら添加剤の詳細は、上記のとおりである。
具体的には、各熱可塑性樹脂層を構成する材料を混練して得られた熱可塑性樹脂組成物を押出成形、プレス成形などして形成すればよい。このとき、可塑剤を使用する場合には、可塑剤に紫外線吸収剤を溶解させ、その混合物とポリビニルアセタール樹脂等の熱可塑性樹脂とを混練して熱可塑性樹脂組成物を作製してもよい。
本発明の合わせガラスは、一対のガラス板と、一対のガラス板の間に配置される上記した合わせガラス用中間膜とを備える。一対のガラス板は、合わせガラス用中間膜によって接着されて合わせガラスを構成する。
合わせガラスで使用するガラス板としては、無機ガラス、有機ガラスのいずれでもよいが、無機ガラスが好ましい。無機ガラスとしては、特に限定されないが、クリアガラス、フロート板ガラス、磨き板ガラス、型板ガラス、網入り板ガラス、線入り板ガラス、グリーンガラス等が挙げられる。
また、有機ガラスとしては、一般的に樹脂ガラスと呼ばれるものが使用され、特に限定されないが、ポリカーボネート、アクリル樹脂、アクリル共重合体樹脂、ポリエステルなどの樹脂から構成される有機ガラスが挙げられる。
2枚のガラス板は、互いに同種の材質から構成されてもよいし、別の材質から構成されてもよい。例えば、一方が無機ガラスで、他方が有機ガラスであってもよいが、2枚のガラス板の両方が無機ガラスであるか、又は有機ガラスであることが好ましい。
また、各ガラス板の厚さは、特に限定されないが、例えば、0.1~15mm程度、好ましくは0.5~5mmである。各ガラス板の厚さは、互いに同一であってもよいし、異なっていてもよいが、同一であることが好ましい。
本発明の合わせガラスは、具体的には、自動車、電車、船舶などの各種乗り物、ビル、マンション、一戸建て、ホール、体育館などの各種建築物等の窓ガラスに使用されることが好ましく、自動車用窓ガラスに使用されることがより好ましい。自動車用窓ガラスはフロントガラス、リアガラス、サイドガラス、ルーフガラスのいずれでもよいが、フロントガラスに使用することが好ましい。光学機能層を有する合わせガラスをフロントガラスに使用すると、HUD用途に好適に使用できる。
第1の熱可塑性樹脂層が、光学機能層よりも屋外側に配置されることで、太陽光からの光は、第1の熱可塑性樹脂層を介して、光学機能層に入射されることになる。本発明では、第1の熱可塑性樹脂層によって、紫外線や400nm付近の光線が十分に吸収されるので、光学機能層の光劣化を適切に防止できる。
次に、本発明の合わせガラス用中間膜、及び合わせガラスの積層構造について図面を参照しつつ説明する。図1は、第1の実施形態に係る合わせガラス用中間膜、及び合わせガラスを示す。第1の実施形態に係る合わせガラス用中間膜は、第1及び第2の熱可塑性樹脂層を有する。
図1に示すように、本実施形態における合わせガラス用中間膜10は、第1及び第2の熱可塑性樹脂層11,12と、光学機能層15とを備え、光学機能層15の一方の面15A側に第1の熱可塑性樹脂層11が、光学機能層15の他方の面15B側に第2の熱可塑性樹脂層12が配置される。ただし、図1において光学機能層15は、基材14上に形成された層であり、したがって、光学機能層15の他方の面15B上には基材14が設けられる。そのため、第2の熱可塑性樹脂層12は、基材14を介して光学機能層15に積層される。
例えば、基材14は光学機能層15の一方の面15A上に設けられてもよく、その場合、第1の熱可塑性樹脂層11が、基材14を介して光学機能層15に積層される。
また、基材14が省略されて、光学機能層14の両面が第1及び第2の熱可塑性樹脂層11,12に直接積層されてもよい。
ただし、基材14は省略されてもよく、第2のガラス板22上に光学機能層15が直接積層されてもよい。この場合、光学機能層15は、例えば第2のガラス板22に光学機能層用組成物を塗布することで形成してもよい。
なお、図2、3に示す第2の実施形態では、基材14は光学機能層15の他方の面15B上に積層される代わりに一方の面15A上に設けられてもよいし、光学機能層15の両面にカバー材と基材がそれぞれ積層されてもよい。
また、上記で説明した各実施形態における合わせガラス用中間膜10、30は、一例を示したに過ぎず、本発明の効果を奏する限り、いかなる積層構造を有してもよく、また、上記以外の層を適宜有してもよい。
本発明の合わせガラス用中間膜は、特に限定されないが、第1の熱可塑性樹脂層及び光学機能層、あるいは、第1の熱可塑性樹脂層、光学機能層及び第2の熱可塑性樹脂層を少なくとも積層して、熱圧着などすることで製造できる。この際、光学機能層には、基材、カバー材などが適宜取り付けられていてもよい。また、合わせガラスも同様に製造でき、2枚のガラス板の間に、第1の熱可塑性樹脂層及び光学機能層、あるいは、第1の熱可塑性樹脂層、光学機能層及び第2の熱可塑性樹脂層を少なくとも積層して、熱圧着などすることで製造できる。
また、上記製造方法においては、合わせガラス用のガラス板の上に光学機能層を直接形成し、その光学機能層の上に第1の熱可塑性樹脂層などを積層して、合わせガラス用中間膜や合わせガラスを製造してもよい。
ただし、合わせガラス用中間膜、及び合わせガラスの製造方法は、上記に限定されず、本発明の合わせガラス用中間膜、及び合わせガラスを製造できる限りいかなる方法でもよい。
本発明は、上記した合わせガラスと、光源とを備える画像表示システムも提供する。合わせガラスは、上記したように、窓ガラスであるとよく、第1のガラス板が屋外側(自動車では車外側)、第2のガラス板が屋内側(自動車では車内側)に配置される。また、合わせガラス用中間膜に設けられる光学機能層は体積型ホログラムであり、予め干渉光が照射されて露光されることでホログラムが形成され、画像情報を保存している。体積型ホログラムは、通常多重露光され、重畳的に複数の画像情報が記録される。
本発明の画像表示システムは、合わせガラスを自動車のフロントガラスとすると、自動車のHUDとして好適に使用できる。
分光光度計(日立ハイテク社製「U-4100」)を用いて、スリット幅:8nm、スキャンスピード:300nm/minの条件で各熱可塑性樹脂層の波長毎の透過率を測定した。
[可視光線透過率]
合わせガラスの可視光線透過率(Tv)は、JISR3106(1998)に準拠して分光光度計(日立ハイテク社製「U-4100」)を用いて測定した。
[耐光性試験]
各実施例、比較例で得られた合わせガラスに、JIS R 3205(2005)に準拠して、第1のガラス板側から紫外線照射装置(HLG-2S、スガ試験機社製)を用いて紫外線を1000時間照射し、紫外線照射後における合わせガラスのTvを測定した。紫外線照射前のTvも測定し、(紫外線照射前のTv-紫外線照射後のTv)よりΔTvを測定した。黄色度の変化ΔYI及び色差の変化量ΔEについても同様に測定した。なお、ΔYIは分光光度計(日立ハイテク社製「U-4100」)を用いて、JIS K7373に準拠して、紫外線照射前後のC光XYZ表色系YIを算出した。ΔEは分光光度計(日立ハイテク社製「U-4100」)を用いて、紫外線照射前後の合わせガラスの三刺激値を測定し、明度指数およびクロマティクネス指数を算出し、JIS Z8731に記載のハンターの色差式に従って色差ΔEを求めた。
(樹脂)
PVB:ポリビニルブチラール樹脂、アセタール化度69モル%、水酸基量30モル%、アセチル化度1モル%、重合度1700
(可塑剤)
3GO:トリエチレングリコールジ-2-エチルヘキサノエート
(紫外線吸収剤)
ベンゾトリアゾール化合物:式(1)で表され、かつXが塩素原子、R11がメチル基、R12はtert-ブチル基で表される化合物。商品名.Tinuvin 326、チバスペシャリティ・ケミカルズ社製、最大吸収波長ピーク353nm
ポルフィリン化合物:式(3-1)で表され、かつR35、R36、R37、R38がパラ位に配位され、かつ-COOCH3で表される化合物。最大吸収波長ピーク415nm
なお、ポルフィリン系化合物は、以下の方法により調製した。
テトラキス(4-カルボキシフェニル)ポルフィリンテトラメチルエステル(和光純薬工業株式会社製)0.31g(0.37mmol)をクロロホルム50mLに溶解させ、そこに塩化銅2.11g(15.5mmol)を溶解させた飽和メタノール溶液40mLを加えて、24時間加熱還流を行なった。24時間後、室温まで冷却し、分液ロートに移し、蒸留水を用いて洗浄を行なった。その後、残った有機層をエバポレーターを用いて減圧留去した。その後、少量のクロロホルムに溶解させ、ヘキサン及びジエチルエーテルで再沈殿を行なうことで、目的物を得た(0.27g、収率80%)。
メタノール120mlに1-メチル-2-フェニル-1H-インドール-3-カルボアルデヒド23.5g(0.10mol)、及び、シアノ酢酸メチル11.9g(0.12mol)を加えた。次いで、ピペリジン2.5g(0.03mol)を加え、還流下6時間反応させ、室温まで冷却した後、析出した結晶を得た。得られた結晶を少量のアルコールで洗浄後、乾燥して、上記式(2)においてR21がメチル基、R22がメチル基であるインドール系化合物の淡黄色結晶を30.9g得た。なお、得られたインドール化合物の融点は193.7℃、最大吸収波長ピークが391nmであった。
(第1の熱可塑性樹脂層の作製)
表1に示す配合に従って、ポリビニルブチラール樹脂、可塑剤、及び紫外線吸収剤を混合し、得られた熱可塑性樹脂組成物を二軸異方押出機により押出成形して、厚さ380μmの第1の熱可塑性樹脂層を作製した。なお、上記成分を混合するとき、接着力調整剤としての有機酸マグネシウム水溶液を、第1の熱可塑性樹脂層におけるMg濃度が65ppmとなるようにさらに添加した。なお、Mgの濃度は、ICP発光分析装置(島津製作所社製「ICPE-9000」)によりMg含有量を測定し求めることができる。
(光学機能層の作製)
光反応性モノマーとしてのアクリル系モノマー、マトリックスポリマーとしてのポリウレタン、光重合開始剤、及び染料を含む光学機能層用組成物を、基材としての厚さ60μmのTAC(セルローストリアセテート)フィルムに塗布して乾燥させて、基材の一方の面上に積層された厚さ3μmの光学機能層を得た。次に、波長532nmを有すレーザー光源を用いて露光し、光反応性モノマーを反応させ重合させた。露光の際、光学機能層上に2方向からの光の波を干渉させることで、ホログラムを有する光学機能層とした。
(第2の熱可塑性樹脂層の作製)
紫外線吸収剤の配合量を表1に示すとおりに変更した以外は、第1の熱可塑性樹脂層と同様に第2の熱可塑性樹脂層を作製した。
得られた第1及び第2の熱可塑性樹脂層を、23℃、相対湿度28%の恒温恒湿条件で4時間保持した。その後、透明なクリアガラス板(厚さ2.5mm)を2枚用意して、一方のクリアガラス板の上に、第2の熱可塑性樹脂層、基材付き光学機能層、第1の熱可塑性樹脂層、及び他方のクリアガラス板をこの順に重ねて積層体とした。得られた積層体を、ゴムバッグ内に移し、ゴムバッグを吸引減圧系に接続し、外気加熱温度で加熱すると同時に-600mmHg(絶対圧力160mmHg)の減圧下で10分間保持し、積層体の温度(予備圧着温度)がそれぞれ60℃になるように加熱した後、大気圧に戻して仮圧着を行った。仮圧着された積層体を、オートクレーブ内で、温度140℃、圧力1.3MPaの条件下に10分間保持した後、50℃まで温度を下げ大気圧に戻すことにより本圧着を終了して、合わせガラスを得た。合わせガラスは、第1のガラス板/第1の熱可塑性樹脂層/光学機能層/基材/第2の熱可塑性樹脂層/第2のガラス板の層構成からなるものであった。
第1の熱可塑性樹脂層に配合される紫外線吸収剤の種類、及び配合量を表1に示すとおりに変更した以外は、実施例1と同様に実施した。なお、比較例1では、第1の熱可塑性樹脂層には紫外線吸収剤を配合しなかった。
11 第1の熱可塑性樹脂層
12 第2の熱可塑性樹脂層
14 基材
15 光学機能層
20、40 合わせガラス
21 第1のガラス板
22 第2のガラス板
Claims (11)
- 光学機能層と、前記光学機能層の一方の面側に設けられる第1の熱可塑性樹脂層とを備え、
前記光学機能層が光反応性モノマーの重合体、及びマトリックスポリマーを含み、
前記第1の熱可塑性樹脂層が紫外線吸収剤を含み、かつ波長400nmにおける透過率が20%以下である合わせガラス用中間膜。 - 前記第1の熱可塑性樹脂層の波長410nmにおける透過率が60%以下である請求項1に記載の合わせガラス用中間膜。
- 前記第1の熱可塑性樹脂層の波長420nmにおける透過率が70%以下である請求項1又は2に記載の合わせガラス用中間膜。
- 前記紫外線吸収剤がベンゾトリアゾール化合物、インドール系化合物、及びポルフィリン化合物からなる群から選択される少なくとも1種である請求項1~3のいずれか1項に記載の合わせガラス用中間膜。
- 前記紫外線吸収剤が、ベンゾトリアゾール化合物と、インドール系化合物及びポルフィリン化合物からなる群から選択される少なくとも1種とを含む請求項4に記載の合わせガラス用中間膜。
- 前記光学機能層の他方の面側に設けられる第2の熱可塑性樹脂層をさらに備える請求項1~5のいずれか1項に記載の合わせガラス用中間膜。
- 前記第2の熱可塑性樹脂層の波長400nmにおける透過率をT400(2)、前記第1の熱可塑性樹脂層の波長400nmにおける透過率をT400(1)とした場合に、T400(2)>T400(1)の関係を満たす請求項6に記載の合わせガラス用中間膜。
- 前記第2の熱可塑性樹脂層の波長410nmにおける透過率をT410(2)、前記第1の熱可塑性樹脂層の波長410nmにおける透過率をT410(1)とした場合に、T410(2)>T410(1)の関係を満たす請求項6又は7に記載の合わせガラス用中間膜。
- 前記第2の熱可塑性樹脂層の波長420nmにおける透過率をT420(2)、前記第1の熱可塑性樹脂層の波長420nmにおける透過率をT420(1)とした場合に、T420(2)>T420(1)の関係を満たす請求項6~8のいずれか1項に記載の合わせガラス用中間膜。
- 前記光学機能層が光重合開始剤を含有する請求項1~9のいずれか1項に記載の合わせガラス用中間膜。
- 請求項1~10のいずれか1項に記載の合わせガラス用中間膜と、一対のガラス板を備え、前記一対のガラス板の間に合わせガラス用中間膜が配置される合わせガラス。
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- 2020-03-19 US US17/437,300 patent/US20220176682A1/en active Pending
- 2020-03-19 EP EP20774242.0A patent/EP3943291A4/en active Pending
- 2020-03-19 WO PCT/JP2020/012500 patent/WO2020189780A1/ja active Application Filing
- 2020-03-19 JP JP2020527127A patent/JPWO2020189780A1/ja active Pending
- 2020-03-19 CN CN202080019995.XA patent/CN113557135A/zh active Pending
- 2020-03-19 MX MX2021010937A patent/MX2021010937A/es unknown
- 2020-03-19 KR KR1020217028842A patent/KR20210145137A/ko unknown
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US20220176682A1 (en) | 2022-06-09 |
KR20210145137A (ko) | 2021-12-01 |
EP3943291A4 (en) | 2022-12-14 |
MX2021010937A (es) | 2021-10-13 |
JPWO2020189780A1 (ja) | 2020-09-24 |
CN113557135A (zh) | 2021-10-26 |
EP3943291A1 (en) | 2022-01-26 |
TW202043170A (zh) | 2020-12-01 |
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