JP4942556B2 - Intermediate film for laminated glass and laminated glass using the same - Google Patents

Description

  The present invention relates to an interlayer film for laminated glass, and more particularly to an interlayer film for laminated glass comprising a laminate of a resin layer containing a transparent adhesive resin such as an ethylene-vinyl acetate copolymer and a resin layer containing polyethylene terephthalate.

  Conventionally, a laminated glass in which a transparent adhesive resin film is interposed as an intermediate film between two transparent substrates is known. Laminated glass has improved penetration resistance and the like due to the presence of the intermediate film. Accordingly, for example, a laminated glass of an automobile is useful as a security glass because the window cannot be freely opened even if it is broken for the purpose of theft or intrusion. In addition, broken glass fragments remain attached to the intermediate film in response to an impact from the outside, so that scattering can be prevented.

  Such laminated glass is used in various applications such as aircraft, automobile windshields and side glass, building window glass, show windows, water tanks, pool viewing windows, office automation equipment, office equipment, and electrical / electronic equipment. It is used. Accordingly, the laminated glass is required to have safety such as penetration resistance and prevention of scattering of broken glass and to have a high degree of appearance design.

  As an intermediate film in a conventional laminated glass, a PVB resin film obtained by molding a composition containing a polyvinyl butyral resin (hereinafter also referred to as “PVB”) and a plasticizer into a sheet shape is used. While PVB is excellent in impact resistance, penetration resistance, etc., it is easily affected by moisture and has insufficient moisture resistance. That is, due to the permeation of moisture or water at a high temperature, a cloud point (white point) is generated in the intermediate film over time, and the appearance design and transparency of the laminated glass may be lowered. Therefore, a resin film containing an ethylene-vinyl acetate copolymer (hereinafter also referred to as “EVA”) excellent in moisture resistance and sound insulation instead of PVB has been proposed as an interlayer film for laminated glass.

  Laminated glass used in aircraft, automobile windshields and side windows, building window glass, etc., as described above, is prevented from being broken by physical impact or heating, ensuring high crime prevention and safety. Therefore, it is required to have excellent impact resistance, penetration resistance, flame heat resistance, and the like. Therefore, conventionally, an interlayer film for laminated glass comprising a laminate of a resin layer made of polyethylene terephthalate (PET layer) and a resin layer made of a transparent adhesive resin such as an ethylene-vinyl acetate copolymer (transparent adhesive resin layer). A laminated glass using a glass is also known (Patent Document 1).

JP 2002-321948 A

  According to the interlayer film for laminated glass disclosed in Patent Document 1, a laminated glass having excellent impact resistance, penetration resistance and flame heat resistance can be obtained. However, when the interlayer film for laminated glass is used in an environment such as an outdoor room exposed to high temperature and high humidity or wind and rain, the interlayer film and the transparent substrate are peeled off by moisture penetrating into the inside from the end of the laminated glass. In some cases, peeling of the PET layer and the transparent adhesive resin layer in the intermediate film occurred. When such peeling occurs, not only the impact resistance and penetration resistance of the laminated glass are lowered, but also the appearance design is lowered. Laminated glass is required to be able to maintain various performances such as high impact resistance, penetration resistance and appearance design for several decades or more.

  Then, this invention aims at providing the intermediate film for laminated glasses which consists of the laminated body of the resin layer containing a transparent adhesive resin, and the resin layer containing a polyethylene terephthalate, and was excellent in durability in which the deterioration resulting from a water | moisture content was prevented. To do.

  Furthermore, an object of the present invention is to provide a laminated glass using the interlayer film for laminated glass.

As a result of various studies in view of the above problems, the present inventor has found that the interlayer film for laminated glass composed of a laminate of a transparent adhesive resin layer and a PET layer has low moisture resistance of the PET layer and has penetrated into the interior. It has been found that the above-described peeling or the like occurs due to deterioration of the PET layer due to excessive moisture. In particular, in the conventional interlayer film for laminated glass, both the transparent adhesive resin layer and the PET layer are simply laminated using the same size, so that the PET layer is exposed at the end face of the interlayer film and is based on moisture. Deterioration was promoted. Therefore, in order to prevent the occurrence of the deterioration, it is an effective means to prevent the contact between the PET layer and moisture.

Therefore, the present invention is an interlayer film for laminated glass having a resin layer (B) containing polyethylene terephthalate between resin layers (A) containing two layers of transparent adhesive resin,
The transparent adhesive resin contains an ethylene-vinyl acetate copolymer and a crosslinking agent,
The outer peripheral length of the resin layer (B) is 0.7 to 0.9 times the outer peripheral length of the resin layer (A), and the end of the resin layer (A) is the resin layer (B). The above-mentioned problem is solved by an interlayer film for laminated glass characterized in that it protrudes beyond the end of

  Furthermore, this invention solves the said subject with the laminated glass formed by pinching | interposing the interlayer film for laminated glasses between two transparent substrates, and integrating them.

  In the interlayer film for laminated glass of the present invention, the resin layer (B) containing polyethylene terephthalate is prevented from coming into contact with moisture by the resin layer (A) containing a transparent adhesive resin. Therefore, deterioration of the resin layer (B) can be suppressed and an interlayer film for laminated glass having excellent durability can be obtained. Laminated glass using such an interlayer film for laminated glass can be used in a high temperature and high humidity environment. Even if it exists, the outstanding external appearance design property, impact resistance, penetration resistance, and flame heat resistance can be maintained over a long period of time.

  First, the interlayer film for laminated glass of the present invention will be described with reference to FIG. FIG. 1A is a schematic top view of the interlayer film for laminated glass of the present invention, and the broken line in FIG. 1A is a polyethylene disposed between resin layers (A) 110A and 110B containing a transparent adhesive resin. A resin layer (B) 120 containing terephthalate is shown. FIG. 1B is a cross-sectional view taken along line AA ′ of the interlayer film for laminated glass shown in FIG.

  As shown in FIG. 1, the interlayer film for laminated glass of the present invention has a resin layer (B) 120 containing polyethylene terephthalate between resin layers (A) 110A and 110B containing two layers of transparent adhesive resin. Further, the outer peripheral length of the resin layer (B) 120 is smaller than the outer peripheral lengths of the resin layers (A) 110A and 110B, and the end portions of the resin layers (A) 110A and 110B are the resin layer (B). It protrudes from the end of 120.

  Thus, since the interlayer film for laminated glass of the present invention has a configuration in which the size of the resin layer (B) is smaller than that of the resin layer (A) and the resin layer (B) is not exposed at the end face, Contact between B) and moisture from the outside is prevented, and deterioration of the resin layer (B) based on moisture can be suppressed. As a result, the interlayer film for laminated glass can maintain high adhesiveness for a long period of time even in an environment such as an outdoor room exposed to high temperature and high humidity or wind and rain.

In the interlayer film for laminated glass of the present invention, the outer peripheral length of the resin layer (B) is 0.7 to 0.9 times the outer peripheral length of the resin layer (A) . Resin layer against tree fat layer (A) an outer peripheral length of (B), the impact resistance of a resin layer (B) by 0.7 times or more, to improve the penetration resistance and fire torrid, etc. When the ratio is 0.9 times or less, it is possible to prevent the resin layer (B) from contacting with moisture and to suppress deterioration of the resin layer (B).

  What is necessary is just to determine the specific outer periphery length of the said resin layer (A) and the said resin layer (B) according to the use of the laminated glass in which these are used.

  The thickness of the resin layer (B) is preferably 0.05 to 5 mm, more preferably 0.05 to 1 mm. Thereby, while being able to ensure impact resistance, penetration resistance, and flame heat resistance, it can prevent more reliably that the said resin layer (B) contacts with water.

  The thickness of the resin layer (A) is preferably 0.05 to 5 mm, more preferably 0.2 to 1.6 mm. Thereby, it can prevent more reliably that the said resin layer (B) contacts with water.

  The resin layer (B) used for the interlayer film for laminated glass of the present invention contains polyethylene terephthalate. The polyethylene terephthalate is a resin mainly composed of terephthalic acid and ethylene glycol. The polyethylene terephthalate is obtained by a known method, that is, an ester exchange reaction from dimethyl terephthalate and ethylene glycol, or a direct esterification method from terephthalic acid and ethylene glycol, followed by melt polymerization, or further Obtained by solid state polymerization.

  If it is 20 parts by mass or less with respect to 100 parts by mass of the polyethylene terephthalate, other components can be further copolymerized. Further, other polyesters may be mixed. As other components, other dicarboxylic acid components such as isophthalic acid and adipic acid, and other diol components such as propylene glycol, diethylene glycol, and hexamethylene glycol can be used.

  It is preferable that at least one surface of the resin layer (B) in contact with the resin layer (A) further has a heat ray shielding film. The heat ray shielding film has a function of transmitting visible light among all light rays and reflecting heat rays (infrared rays), and suppresses an increase in indoor temperature due to incidence of heat rays when laminated glass is used for a window glass or the like. Is also possible. Furthermore, the heat ray shielding film is formed on the resin layer (B), whereby contact between the resin layer (B) and moisture can be suppressed.

  The heat ray shielding film is preferably a film made of a metal or a metal material capable of absorbing or reflecting near-infrared rays having a wavelength of 780 nm or more, particularly 780 to 2100 nm, among solar rays. The metal is preferably Sn, Ti, Si, Zn, Zr, Fe, Al, Cr, Co, Ce, In, Ni, Pd, Ag, Au, Cu, Pt, Mn, Ta, W, V, Mo. The metals or alloys are preferably mentioned. Moreover, as said metal substance, the said metal oxide, nitride, sulfide or a Sb or F dope etc. are mentioned preferably. In the heat ray shielding film, these metals or metal substances may be used alone or in combination of two or more.

  The heat ray shielding film is preferably a film made of the above-described metal or metal oxide, particularly a film made of antimony-doped tin oxide and / or tin-doped indium oxide.

  The thickness of the heat ray shielding film is preferably 10 to 300 nm. Thereby, contact with the said resin layer (B) and a water | moisture content can be suppressed, without reducing transparency in the intermediate film for laminated glasses.

The resin layer (A) used for the interlayer film for laminated glass of the present invention contains a transparent adhesive resin. The transparent adhesive resin is not particularly limited as long as the transparent substrate can be bonded and integrated by crosslinking and curing at the time of heating and pressurizing when producing the laminated glass. In the present invention, an ethylene vinyl acetate copolymer is used because it is inexpensive and excellent in transparency among transparent adhesive resins. As the ethylene-vinyl acetate copolymer, those having a vinyl acetate unit content of 20 to 35 parts by mass, particularly 24 to 28 parts by mass with respect to 100 parts by mass of ethylene-vinyl acetate copolymer resin are used. Is preferred. If the content of the vinyl acetate unit is less than 20 parts by mass, the transparency of the resin layer (A) may be insufficient. If it exceeds 35 parts by mass, the resin layer (A) of the resin layer (A) may be subjected to thermocompression bonding. Hardness may be insufficient.

The resin layer (A), in addition to the transparent adhesive resin, including a cross-linking agent. Thereby, the crosslink density of the transparent adhesive resin of an ethylene-vinyl acetate copolymer can be improved, and it becomes possible to express the outstanding adhesive force.

  As said crosslinking agent, the organic peroxide which decomposes | disassembles at the temperature of 100 degreeC or more and generate | occur | produces a radical can be used. The organic peroxide is generally selected in consideration of the film formation temperature, the adjustment conditions of the composition, the curing temperature, the flame heat resistance of the adherend, and the storage stability. In particular, those having a decomposition temperature of 70 hours or more with a half-life of 10 hours are preferred.

  Examples of the organic peroxide include, from the viewpoint of resin processing temperature and storage stability, for example, benzoyl peroxide curing agent, tert-hexyl peroxypivalate, tert-butyl peroxypivalate, 3, 5, 5- Trimethylhexanoyl peroxide, di-n-octanoyl peroxide, lauroyl peroxide, stearoyl peroxide, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, succinic acid peroxide, 2,5-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane, 1-cyclohexyl-1-methylethylperoxy-2-ethylhexanoate, tert-hexylperoxy-2-ethylhexa Noate, 4-methylbenzoyl peroxide tert-butylperoxy-2-ethylhexanoate, m-toluoyl + benzoyl peroxide, benzoyl peroxide, 1,1-bis (tert-butylperoxy) -2-methylcyclohexanate, 1,1-bis (Tert-hexylperoxy) -3,3,5-trimethylcyclohexanate, 1,1-bis (tert-hexylperoxy) cyclohexanate, 1,1-bis (tert-butylperoxy) cyclohexanate 2,2-bis (4,4-di-tert-butylperoxycyclohexyl) propane, 1,1-bis (tert-butylperoxy) cyclododecane, 1,1-bis (tert-hexylperoxy)- 3,3,5-trimethylcyclohexane tert-hexylperoxyisopropyl Rumonocarbonate, tert-butylperoxymaleic acid, tert-butylperoxy-3,3,5-trimethylhexanoate, tert-butylperoxylaurate, 2,5-dimethyl-2,5-di (methyl) Benzoylperoxy) hexane, tert-butylperoxyisopropyl monocarbonate, tert-butylperoxy-2-ethylhexyl monocarbonate, tert-hexylperoxybenzoate, 2,5-di-methyl-2,5-di (benzoylper) Oxy) hexane and the like.

  Examples of the benzoyl peroxide curing agent include benzoyl peroxide, 2,5-dimethylhexyl-2,5-bisperoxybenzoate, p-chlorobenzoyl peroxide, m-toluoyl peroxide, 2, Examples include 4-dichlorobenzoyl peroxide and t-butyl peroxybenzoate. Moreover, you may use a crosslinking agent 1 type or in combination of 2 or more types.

  Preferred examples of the crosslinking agent include organic peroxides, particularly tert-butylperoxy-2-ethylhexyl monocarbonate and 1,1-bis (tert-hexylperoxy) -3,3,5-trimethylcyclohexane. With this organic peroxide, the crosslink density of a transparent adhesive resin such as an ethylene-vinyl acetate copolymer can be improved.

  The content of the crosslinking agent in the resin layer (A) is preferably 0.05 to 5.0 parts by mass, more preferably 0.1 to 3.0 parts by mass with respect to 100 parts by mass of the transparent adhesive resin. . If the content of the crosslinking agent is too large, the compatibility with the copolymer may be deteriorated.

  Furthermore, the resin layer (A) may contain a crosslinking aid as necessary. The crosslinking aid can be added to the composition in order to improve the gel fraction of a transparent adhesive resin such as ethylene-vinyl acetate copolymer and to improve the mechanical strength of the interlayer film for laminated glass. As a crosslinking aid (compound having a radical polymerizable group as a functional group) used for this purpose, as well-known trifunctional crosslinking aids such as triallyl cyanurate and triallyl isocyanurate, ) Monofunctional or bifunctional crosslinking aids of acrylic esters (eg, NK esters, etc.) can also be mentioned. Of these, triallyl cyanurate and triallyl isocyanurate are preferable, and triallyl isocyanurate is particularly preferable. These crosslinking assistants are generally used in an amount of 10 parts by mass or less, preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the transparent adhesive resin.

  Furthermore, the resin layer (A) is used to improve or adjust various physical properties of the film (optical properties such as mechanical strength, adhesiveness, transparency, flame heat resistance, light resistance, crosslinking speed, etc.), particularly mechanical strength. In order to improve the above, it may further contain various additives such as a plasticizer and an adhesion improver, if necessary.

  The plasticizer is not particularly limited, but polybasic acid esters and polyhydric alcohol esters are generally used. Examples thereof include dioctyl phthalate, dihexyl adipate, triethylene glycol-di-2-ethylbutyrate, butyl sebacate, tetraethylene glycol diheptanoate, and triethylene glycol dipelargonate. One type of plasticizer may be used, or two or more types may be used in combination. The content of the plasticizer is preferably in the range of 5 parts by mass or less with respect to 100 parts by mass of the ethylene-polar monomer copolymer.

  As the adhesion improver, a silane coupling agent can be used. Examples of the silane coupling agent include γ-chloropropylmethoxysilane, vinylethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, γ-glycidoxypropyltri Methoxysilane, γ-glycidoxypropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N- Mention may be made of β- (aminoethyl) -γ-aminopropyltrimethoxysilane. These silane coupling agents may be used alone or in combination of two or more. Moreover, it is preferable that content of the said adhesive improvement agent is 5 mass parts or less with respect to 100 mass parts of transparent adhesive resin.

  Furthermore, the resin layer (A) may contain an ultraviolet absorber, a light stabilizer and an anti-aging agent.

  The ultraviolet absorber is not particularly limited, but 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2,4-dihydroxybenzophenone, 2,2′-dihydroxy-4- Preferred examples include benzophenone ultraviolet absorbers such as methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, and 2-hydroxy-4-n-octoxybenzophenone. In addition, it is preferable that the compounding quantity of the said benzophenone series ultraviolet absorber is 0.01-5 mass parts with respect to 100 mass parts of transparent adhesive resin.

  As the light stabilizer, a light stabilizer called a hindered amine type is preferably used. For example, LA-52, LA-57, LA-62, LA-63LA-63p, LA-67, LA-68 (all of which are stocks) ADEKA), Tinuvin 744, Tinuvin 770, Tinuvin 765, Tinuvin 144, Tinuvin 622LD, CHIMASSORB 944LD (all manufactured by Ciba Specialty Chemicals Co., Ltd.), UV-3034 (manufactured by BF Goodrich) Can do. In addition, the said light stabilizer may be used independently or may be used in combination of 2 or more types, and the compounding quantity is 0.01-5 mass parts with respect to 100 mass parts of transparent adhesive resin. preferable.

  Examples of the antioxidant include hindered phenol antioxidants such as N, N′-hexane-1,6-diylbis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionamide]. , Phosphorus heat stabilizers, lactone heat stabilizers, vitamin E heat stabilizers, sulfur heat stabilizers, and the like.

  In order to produce the interlayer film for laminated glass of the present invention described above, a known method can be used. For example, a method of laminating the resin layer (A) and the resin layer (B) after separately producing them is used.

  In order to produce the resin layer (A), in addition to the transparent adhesive resin, each of the main components described above as components used in the resin layer (A) is kneaded with a roll mill while being heated as necessary. A method of forming the obtained mixture into a sheet by a film forming method such as extrusion molding, calendar molding, T-die molding or the like is used. Alternatively, the mixture is dissolved in a suitable solvent to form a solution, and this solution is coated on a suitable support using a coater such as a roll coater, knife coater or doctor blade, and dried to form a sheet. Can be used.

  In order to produce the resin layer (B), the same method as that for the resin layer (A) described above can be used. Moreover, since the said resin layer (B) can improve impact resistance, penetration resistance, and flame heat resistance, it is preferable to use what was manufactured by biaxial stretching. In such a case, the following method is used.

  A polyester raw material containing polyethylene terephthalate is put into an extruder, heated and melted, melt-extruded, and extruded from a die orifice of an extrusion T-die to produce an unstretched sheet. The sheet extruded from the die orifice of the T-die is cooled by being closely attached to a cooling drum by an electrostatic application casting method or the like, and then at a temperature of 90 to 140 ° C., 2.5 to 5. The film is stretched at a magnification of 0, and further heat treated at a temperature of 210 ° C. to 245 ° C. to obtain a biaxially stretched film.

  Moreover, what is necessary is just to perform using a well-known method, when producing a heat ray shielding film on the said resin layer (B). For example, in order to produce a heat ray shielding film made of a metal or metal oxide, a vapor phase growth method is preferable, and a vacuum deposition method, a sputtering method, or a plasma CVD method is more preferable. In addition, a conventionally known coating film forming method such as PVD, CVD, or sol-gel method is used.

  After the resin layer (A) and the resin layer (B) produced separately as described above are laminated in the order of resin layer (A) / resin layer (B) / resin layer (A), preferably obtained by this. The laminated body as it is is passed between a pair of hot rolls and is sandwiched and pressure-bonded, and heat-pressed and laminated to form a single laminated film. Thereby, the adhesiveness of a resin layer (A) and a resin layer (B) can be improved. The thermocompression bonding does not have to be performed when a laminated glass is produced immediately after laminating the resin layer (A) and the resin layer (B).

  Moreover, as a method for producing the interlayer film for laminated glass of the present invention, the resin layer (A), the resin layer (B), the resin layer ( A method of producing a laminate of resin layer (A) / resin layer (B) / resin layer (A) by three-layer extrusion molding with A), EVA resin composition on both surfaces of the resin layer (B) formed in advance A method of applying an object is also used.

  According to the interlayer film for laminated glass of the present invention described above, the deterioration due to moisture of the resin layer made of polyethylene terephthalate is suppressed, thereby improving various characteristics such as impact resistance, penetration resistance and flame heat resistance. It becomes possible to provide a laminated glass that can be maintained over a period of time.

  Examples of the configuration of the laminated glass include a configuration in which an interlayer film for laminated glass is sandwiched between two transparent substrates and bonded and integrated.

  In the present invention, the “glass” in the laminated glass means the whole transparent substrate, and therefore the “laminated glass” means one obtained by sandwiching at least an intermediate film on the transparent substrate.

  In the laminated glass, as shown in FIG. 2, the outer peripheral lengths of the resin layers (A) 210A and 210B are made smaller than the outer peripheral lengths of the transparent substrates 230A and 230B, and the end portions of the transparent substrates 230A and 230B. May protrude beyond the end of the interlayer film 200 for laminated glass.

  In FIG. 2, FIG. 2 (A) is a schematic top view of the laminated glass of the present invention, and the broken line in FIG. 1 (A) indicates the interlayer film 200 for laminated glass disposed between the transparent substrates 230A and 230B. Show. FIG. 2B is a cross-sectional view taken along line AA ′ of the laminated glass illustrated in FIG.

  The same transparent substrate may be used for each transparent substrate disposed on both sides of the intermediate film in the laminated glass, or different transparent substrates may be used in combination. The combination of the transparent substrates is preferably determined in consideration of the strength of the transparent substrate and the use of the laminated glass.

  Although it does not specifically limit as a transparent substrate used for laminated glass, For example, plastic films other than glass plates, such as a silicate glass, an inorganic glass plate, a non-colored transparent glass plate, may be used. Examples of the plastic film include a polyethylene terephthalate (PET) film, a polyethylene aphthalate (PEN) film, and a polyethylene butyrate film, and a PET film is preferred. The thickness of the transparent substrate is generally about 1 to 20 mm.

  In the laminated glass according to the present invention, it is preferable that the intermediate film is sandwiched between two transparent substrates and integrated by crosslinking. Such a laminated glass is obtained by degassing the laminated body of the transparent substrate and the intermediate film described above, and then pressing and curing the EVA contained in the intermediate film by crosslinking and curing.

  The crosslinking is generally performed by heat treatment at 100 to 150 ° C., particularly around 130 ° C., for 10 to 120 minutes, preferably 10 to 60 minutes. The cross-linking may be performed after pre-bonding at a temperature of, for example, 80 to 120 ° C. The heat treatment is particularly preferably, for example, at 130 ° C. for 10 to 30 minutes (atmospheric temperature). The layered product after crosslinking is generally performed at room temperature, and in particular, the faster the cooling, the better.

  Since the laminated glass according to the present invention can maintain properties such as impact resistance, penetration resistance and flame heat resistance over a long period of time, it can be suitably used for the following applications. In other words, automotive glass, side glass and rear glass, railway vehicles such as ordinary vehicles, express vehicles, express vehicles and sleeper vehicles, door windows for passenger doors, window glasses and indoor door glasses, windows in buildings, etc. Glass and indoor door glass, indoor display showcases and show windows, and water tanks. However, the application is not limited to these.

  Hereinafter, the present invention will be described with reference to examples. The present invention is not limited by the following examples.

Example 1
1. Preparation of interlayer film for laminated glass Each material was supplied to a roll mill with the composition shown below and kneaded at 80 ° C. to prepare a composition. The composition is calendered at a calender roll temperature of 80 ° C. and a processing speed of 5 m / min, and then allowed to cool, whereby a resin layer (A) containing EVA (thickness 0.4 mm, size 100 mm × 100 mm) is obtained. Produced.

Formulation;
EVA (content of vinyl acetate 25 parts by mass with respect to 100 parts by mass of EVA) 100 parts by mass,
2.5 parts by mass of a cross-linking agent (tert-butyl peroxy-2-ethylhexyl monocarbonate; Perbutyl (registered trademark) E manufactured by NOF Corporation),
Crosslinking aid (triallyl isocyanurate; Nippon Kasei Co., Ltd. TAIC (registered trademark)) 2 parts by mass,
Silane coupling agent (3-methacryloxypropyltrimethoxysilane; manufactured by Toray Dow Corning Co., Ltd., SZ6030) 0.5 parts by mass

  Next, a resin layer (B) (thickness 0.1 mm, size 90 mm × 90 mm) containing polyethylene terephthalate made of a polyethylene terephthalate film is disposed between the two resin layers (A) prepared above in FIG. By arranging and laminating as shown, an interlayer film for laminated glass was obtained.

2. Production of laminated glass The interlayer film for laminated glass produced above is sandwiched between two glass substrates (thickness 3 mm, size 100 mm x 100 mm), and the resulting laminate is placed in a rubber bag and vacuumed. Deaerated and pre-pressed at a temperature of 100 ° C. Further, this was put in an autoclave and subjected to pressure heat treatment for 30 minutes under the conditions of a pressure of 13 × 10 ⁵ Pa and a temperature of 140 ° C. to obtain a laminated glass.

(Examples 2 and 3, Comparative Example 1)
A resin layer (B) was produced in the same manner as in Example 1 except that the size of the resin layer (B) comprising polyethylene terephthalate comprising a polyethylene terephthalate film was as shown in Table 1, and a laminated glass was prepared using this. Produced.

(Evaluation)
About each laminated glass produced above, the presence or absence of generation | occurrence | production of a plate | board thickness deviation and a moisture resistance test was evaluated in accordance with the following procedure.

1. Plate Thickness Deviation The thickness of each laminated glass produced above was measured with a micrometer in an environment of a temperature of 85 ° C. and a humidity of 85% RH, and the difference between the maximum thickness and the minimum thickness was determined. The results are shown in Table 1.

2. Presence or absence of peeling After each laminated glass prepared above was left for 120 days in an environment of a temperature of 85 ° C. and a humidity of 85% RH, the presence or absence of peeling was visually evaluated. In the laminated glass of Comparative Example 1, peeling occurred between the resin layer (B) and the resin layer (A).

  As shown in Table 1, in the laminated glass produced in each example, although the plate thickness deviation after production is larger than that in Comparative Example 1, even if it is left in a high temperature and high humidity atmosphere for a long period of time, it peels off. It can be seen that the occurrence is highly prevented. Thereby, it turns out that degradation of the resin layer (B) by a water | moisture content is prevented, and the laminated glass excellent in durability is obtained.

FIG. 1A is a schematic top view of the interlayer film for laminated glass of the present invention, and is a cross-sectional view taken along line AA ′ of the interlayer film for laminated glass shown in FIG. FIG. 2A is a schematic top view of the laminated glass of the present invention, and FIG. 2B is a cross-sectional view taken along line AA ′ of the laminated glass shown in FIG.

Explanation of symbols

110A, 110B A resin layer (A) containing a transparent adhesive resin,
120 resin layer (B) containing polyethylene terephthalate,
200 interlayer film for laminated glass,
210A, 210B Resin layer (A) containing transparent adhesive resin,
220 resin layer (B) containing polyethylene terephthalate,
230A, 230B Transparent substrate.

Claims (3)

An interlayer film for laminated glass having a resin layer (B) containing polyethylene terephthalate between two resin layers (A) containing a transparent adhesive resin,
The transparent adhesive resin contains an ethylene-vinyl acetate copolymer and a crosslinking agent,
The outer peripheral length of the resin layer (B) is 0.7 to 0.9 times the outer peripheral length of the resin layer (A), and the end of the resin layer (A) is the resin layer (B). The interlayer film for laminated glass, which protrudes from the end of The interlayer film for laminated glass according to claim 1, further comprising a heat ray shielding film on at least one surface of the resin layer (B) in contact with the resin layer (A). Laminated glass formed by sandwiching and bonding the interlayer film for laminated glass according to claim 1 or 2 between two transparent substrates.

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