JP2016210640A - Interlayer for laminate glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interlayer for laminate glass manufactured by a nip roll method, in which air bubbles between a transparent substrate of the laminate glass to be manufactured and the interlayer do not remain, and which can be satisfactorily bonded to a substrate.SOLUTION: There is provided an interlayer 12 for laminate glass containing a resin mixture of an ethylene-vinyl acetate copolymer A having vinyl acetate percentage content of 30 to 40 mass% and melt flow rate (according to JIS K7210, temperature at 190°C and load at 2.16 kg) of 0.1 to 1.0 g/10 min and an ethylene-vinyl acetate copolymer B having vinyl acetate percentage content of 20 to 26 mass% and melt flow rate (according to JIS K7210, temperature at 190°C and load at 2.16 kg) of 2.0 to 10.0 g/10 min and having mass ratio of the ethylene-vinyl acetate copolymer A to the ethylene-vinyl acetate copolymer B of 25/75 to 75/25.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an interlayer film for laminated glass and a method for producing laminated glass using the same.

  Conventionally, laminated glass has been widely used for window glass for automobiles, aircraft, etc., window glass for buildings, and the like. Laminated glass generally has a structure in which an intermediate film is sandwiched between two transparent substrates such as two glass plates, and has functions such as penetration resistance and prevention of scattering of broken glass.

  The intermediate film used for the laminated glass is mainly composed of an ethylene-vinyl acetate copolymer (hereinafter also referred to as EVA) from the viewpoint of adhesion to a transparent substrate such as a glass plate, strength, and transparency (hereinafter also referred to as EVA) ( Hereinafter, transparent resin films such as EVA intermediate films) and polyvinyl butyral (hereinafter also referred to as PVB) as a main component (hereinafter also referred to as PVB intermediate films) are used. In particular, the EVA-based interlayer film is inexpensive and is preferably used because it has excellent water resistance, adhesiveness, and transparency. The EVA-based intermediate film can improve adhesion, penetration resistance, durability, and the like by crosslinking the copolymer using a crosslinking agent such as an organic peroxide.

  As a method of bonding the EVA-based intermediate film and the substrate, a laminate in which a window film and a transparent substrate are laminated through an adhesive layer is put in a vacuum bag, degassed, and pressed under heating, or the above lamination There is a nip roll method or the like in which the body is pressure-bonded with a nip roll while being heated and then cured by secondary heating or the like. In particular, the nip roll method can be said to be an advantageous method that can be produced continuously.

JP 2008-050187 A

  However, since EVA has a high temperature dependency on its fluidity, the temperature range in which the viscosity is suitable for pressure bonding is narrow in the nip roll method. For this reason, accurate temperature control is required to produce a laminated glass having good quality in which no bubbles remain between the substrate and the intermediate film, and it has been difficult to efficiently produce laminated glass.

  Accordingly, an object of the present invention is an interlayer film for laminated glass produced by a nip roll method, in which no bubbles remain between the laminated glass substrate and the interlayer film, and the pressure bonding process with the substrate is performed in a wide temperature range. It is providing the intermediate film for laminated glasses which can be performed.

  The above-mentioned purpose is an ethylene having a vinyl acetate content of 30 to 40% by mass and a melt flow rate (according to JIS K7210, temperature 190 ° C., load 2.16 kg) of 0.1 to 1.0 g / 10 min. The vinyl acetate copolymer A has a vinyl acetate content of 20 to 26% by mass and a melt flow rate (according to JIS K7210, temperature 190 ° C., load 2.16 kg) of 2.0 to 10.0 g / 10 min. A resin composition comprising a mixture with a certain ethylene-vinyl acetate copolymer B, wherein the mass ratio of the ethylene-vinyl acetate copolymer A to the ethylene-vinyl acetate copolymer B is 25/75 to 75/25 It is achieved by an interlayer film for laminated glass characterized by being.

  As in this configuration, by using two kinds of ethylene-vinyl acetate copolymers having the specific vinyl acetate content and MFR in the above mass ratio, the laminated glass substrate and the interlayer film are pressure-bonded in the nip roll method. The process can be performed in a wide temperature range, and bubbles can be prevented from remaining between the substrate and the intermediate film. And if it is the said structure, the adhesiveness as an intermediate film for laminated glasses can fully be acquired.

Preferred embodiments of the present invention are as follows.
(1) The viscosity of the resin composition is 3.0 × 10 ⁵ mPa · s or less at 65 ° C. and 1.0 × 10 ⁴ mPa · s or more at 100 ° C. By setting this viscosity range, it is possible to more reliably prevent bubbles from remaining.
(2) The viscosity at 65 ° C. (V _{65 ° C.} ) and the viscosity at _{100 ° C.} (V _{100 ° C.} ) of the resin composition are the following formula (I)
(V _{65 ° C.-} V _{100 ° C.} ) / V _{65 ° C.} × 100 ≦ 91 (%) (I)
Satisfy the relationship. Laminated glass in which bubbles do not remain can be manufactured more reliably and efficiently.
(3) For laminated glass produced by pressure-bonding two substrates and the interlayer film for laminated glass with a nip roll.

  The above object can also be achieved by a method for producing a laminated glass including a step of pressure-bonding a laminated body in which the interlayer film for laminated glass of the present invention is sandwiched between two substrates by a nip roll.

  According to the present invention, it is possible to provide an interlayer film for laminated glass in which bubbles do not remain between the substrate and the interlayer film for laminated glass and the pressure bonding process with the substrate can be performed in a wide temperature range. Therefore, by using this interlayer film for laminated glass, a laminated glass having a good appearance can be produced with high efficiency.

It is a schematic sectional drawing of a common laminated glass. It is a schematic explanatory drawing of the nip roll method.

  Hereinafter, the present invention will be described in detail. As described above, the interlayer film for laminated glass of the present invention contains a mixture of two kinds of ethylene-vinyl acetate copolymers A and B.

  The ethylene-vinyl acetate copolymer A has a vinyl acetate content of 30 to 40% by mass and a melt flow rate of 0.1 to 1.0 g / 10 min. The preferable range of the vinyl acetate content of the ethylene-vinyl acetate copolymer A is 30 to 35% by mass, and the preferable range of the melt flow rate is 0.5 to 1.0 g / 10 min.

  The ethylene-vinyl acetate copolymer B has a vinyl acetate content of 20 to 26% by mass and a melt flow rate of 2.0 to 10.0 g / 10 min. The preferable range of the vinyl acetate content of the ethylene-vinyl acetate copolymer B is 25 to 26% by mass, and the preferable range of the melt flow rate is 2.0 to 5.0 g / 10 min, and particularly preferably 4.0. -5.0 g / 10 min.

  The mass ratio of ethylene-vinyl acetate copolymer A to ethylene-vinyl acetate copolymer B in the resin mixture is 25/75 to 75-25. If the ethylene-vinyl acetate copolymer A is less than this range, bubbles may remain in the produced laminated glass, and if the ethylene-vinyl acetate copolymer B is less than this range, the adhesion may be poor.

  In the present invention, the melt flow rate is a value measured under conditions of a temperature of 190 ° C. and a load of 2.16 kg in accordance with JIS K7210. The vinyl acetate content is a ratio to the mass of the ethylene-vinyl acetate copolymer.

In the present invention, the viscosity of the interlayer film for laminated glass is preferably 3.0 × 10 ⁵ mPa · s or less at 65 ° C. and 1.0 × 10 ⁴ mPa · s or more at 100 ° C. By setting this viscosity range, it is possible to more reliably prevent bubbles from remaining.

The viscosity at 65 ° C. of the resin composition forming the interlayer film for laminated glass of the present invention is preferably 5.0 × 10 ^{4 to} 3.0 × 10 ⁵ Pa · s, and 6.0 × 10 ⁴ to 2 More preferably, it is 0.0 × 10 ⁵ Pa · s. It is preferable that the viscosity at 100 ° C. of the interlayer film for a laminated glass of the present invention is ^{9.0 × 10 3 ~3.0 × 10 4} Pa · s, 1.0 × 10 4 ~2.0 × 10 More preferably, it is ⁴ Pa · s.

In the present invention, the viscosity at 65 ° C. (V _{65 ° C.} ) and the viscosity at _{100 ° C.} (V _{100 ° C.} ) of the resin composition forming the interlayer film for laminated glass are represented by the following formula (I).
(V _{65 ° C.-} V _{100 ° C.} ) / V _{65 ° C.} × 100 ≦ 91 (%) (I)
It is preferable to satisfy the relationship. This makes it possible to manufacture a laminated glass with no bubbles remaining more reliably and efficiently.

  In the present invention, by using the two ethylene-vinyl acetate copolymers having the specific vinyl acetate content and MFR in the above mass ratio, the step of pressure bonding to the laminated glass substrate in the nip roll method is performed over a wide temperature range. In addition, it is possible to prevent bubbles from remaining between the substrate and the interlayer film for laminated glass. And sufficient adhesiveness as an interlayer film for laminated glass can also be obtained.

[Crosslinking agent]
In the interlayer film for laminated glass of the present invention, it is preferable to further contain a crosslinking agent to form an EVA crosslinked structure. As the crosslinking agent, an organic peroxide or a photopolymerization initiator is preferably used. Among these, it is preferable to use an organic peroxide because a sealing film with improved temperature dependency of adhesive strength, moisture resistance, and penetration resistance can be obtained.

  Any organic peroxide can be used as long as it decomposes at a temperature of 100 ° C. or higher to generate radicals. The organic peroxide is generally selected in consideration of the film formation temperature, the adjustment conditions of the composition, the curing temperature, the 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 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane, 2,5-dimethylhexane-2,5-dihydroperoxide, 3-di-t- Butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexyne, α, α'-bis (t-butylperoxyisopropyl) benzene, n-butyl-4 , 4-bis (t-butylperoxy) butane, t-butylperoxy-2-ethylhexyl monocarbonate, t-hexylperoxyisopropyl monocarbonate, 2,2-bis (t-butylperoxy) butane, 1-bis (t-hexylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) -3,3 -Trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, 2,2-bis (4,4-di-t-butylperoxycyclohexyl) propane, 1,1-bis (t-butylperoxy) ) Cyclododecane, 1,1-bis (t-butylperoxy) cyclohexane, benzoyl peroxide curing agents (t-butylperoxybenzoate, etc.) and the like.

  As the organic peroxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane or tert-butylperoxy-2-ethylhexyl monocarbonate is particularly preferable. Thereby, the intermediate film for laminated glasses which has the outstanding adhesiveness is obtained.

  The content of the organic peroxide is preferably 0.1 to 5 parts by mass, more preferably 0.2 to 3 parts by mass with respect to 100 parts by mass of the total amount of the ethylene-vinyl acetate copolymers A and B. is there. If the content of the organic peroxide is small, the crosslinking speed may be reduced during the crosslinking and curing, and if it is large, the compatibility with EVA may be deteriorated.

  As the photopolymerization initiator, any known photopolymerization initiator can be used, but a photopolymerization initiator having good storage stability after blending is desirable. Examples of such a photopolymerization initiator include 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, and 2-methyl-1- (4- (methylthio) phenyl). Acetophenones such as 2-morpholinopropane-1, benzoins such as benzyldimethylketal, benzophenones such as benzophenone, 4-phenylbenzophenone and hydroxybenzophenone, thioxanthones such as isopropylthioxanthone and 2-4-diethylthioxanthone, As other special ones, methylphenylglyoxylate can be used. Particularly preferably, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, Examples include benzophenone. These photopolymerization initiators may be optionally selected from one or more known photopolymerization accelerators such as a benzoic acid type such as 4-dimethylaminobenzoic acid or a tertiary amine type. It can be used by mixing at a ratio. Moreover, it can be used individually by 1 type of only a photoinitiator, or 2 or more types of mixture.

  Content of a photoinitiator is 0.1-5 mass parts with respect to 100 mass parts of total amounts of ethylene-vinyl acetate copolymer A and B, Preferably it is 0.2-3 mass parts.

[Crosslinking aid]
The interlayer film for laminated glass of the present invention may further contain a crosslinking aid as necessary. The crosslinking aid can improve the gel fraction of EVA and improve the adhesion and durability of the interlayer film for laminated glass.

  The content of the crosslinking aid is generally 10 parts by mass or less, preferably 0.1 to 5 parts by mass, more preferably 0.1 to 100 parts by mass of the total amount of the ethylene-vinyl acetate copolymers A and B. Used at ~ 2.5 parts by weight.

  As a crosslinking aid (generally, a compound having a radical polymerizable group as a functional group), a trifunctional crosslinking aid such as triallyl cyanurate and triallyl isocyanurate, and a (meth) acrylic ester (eg, NK ester) Etc.) of monofunctional or bifunctional crosslinking aids. Of these, triallyl cyanurate and triallyl isocyanurate are preferable, and triallyl isocyanurate is particularly preferable.

[Silane coupling agent]
The interlayer film for laminated glass of the present invention may further contain a silane coupling agent. Thereby, it can be set as the intermediate film for laminated glasses which has the further outstanding adhesive force. As silane coupling agents, γ-chloropropyltrimethoxysilane, vinyltriethoxysilane, 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. Of these, γ-methacryloxypropyltrimethoxysilane is particularly preferred.

  The content of the silane coupling agent is 0.1 to 2.0 parts by weight, particularly 0.3 to 1.0 parts by weight, based on 100 parts by weight of the total amount of ethylene-vinyl acetate copolymers A and B. Is preferred.

[Others]
The interlayer film for laminated glass according to the present invention is provided with a plasticizer or an acryloxy group as necessary for improving or adjusting various physical properties (optical properties such as mechanical strength and transparency, heat resistance, and light resistance). Various additives such as a containing compound, a methacryloxy group-containing compound and / or an epoxy group-containing compound, an ultraviolet absorber, a light stabilizer and an anti-aging agent may be further contained.

[Manufacture of interlayer film for laminated glass]
The interlayer film for laminated glass of the present invention may be formed according to a known method. For example, a composition in which each of the above materials is mixed by a known method using a super mixer (high-speed fluid mixer), a roll mill, etc., is molded by ordinary extrusion molding, calendar molding (calendering), or the like, and is in the form of a sheet. It can manufacture by the method of obtaining. Alternatively, a sheet-like material can be obtained by dissolving the composition in a solvent and coating the solution on a suitable support with a suitable coating machine (coater) and drying to form a coating film. The heating temperature at the time of film formation is preferably a temperature at which the organic peroxide does not react or hardly reacts when an organic peroxide is used as the crosslinking agent. For example, it is preferably 50 to 90 ° C, particularly 40 to 80 ° C. The thickness of the interlayer film for laminated glass is not particularly limited and can be appropriately set depending on the application. Generally, it is in the range of 0.05-2 mm. The interlayer film for laminated glass may be embossed on the surface. Thereby, when bonding with the transparent substrate of a laminated glass, it can prevent that air enters between a transparent substrate and the intermediate film for laminated glasses.

[Laminated glass]
As shown in FIG. 1, the laminated glass has a structure in which two substrates 11 </ b> A and 11 </ b> B are bonded with an intermediate film 12 for laminated glass having a gap therebetween. Hereinafter, the manufacturing method of the laminated glass of this invention is demonstrated, referring drawings.

  FIG. 2 is a schematic sectional view showing a typical example of the method for producing a laminated glass of the present invention. In FIG. 2, the laminated glass is manufactured by forming a laminate 20 in which the interlayer film for laminated glass of the present invention is sandwiched between two substrates, heat-pressing (also referred to as pre-pressing), and then heat-crosslinking. Is done.

  The substrate in the method for producing a laminated glass of the present invention is, for example, a glass plate such as green glass, silicate glass, inorganic glass plate, non-colored transparent glass plate, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), A plastic substrate or film such as polyethylene butyrate or polymethyl methacrylate (PMMA) may be used. A glass plate is preferable in terms of heat resistance, weather resistance, impact resistance, and the like. The thickness of the substrate is generally about 1 to 20 mm. The same substrate may be used, or different substrates may be used in combination. The combination is determined in consideration of the strength of the substrate and the use of the laminated glass. As the laminated glass, a transparent substrate, particularly a glass plate is generally used.

  The manufacturing method of the laminated glass of this invention in FIG. 2 is explained in full detail. The laminate 20 described above is passed through the heating furnace 31 while being transported by the transport device 33. The heating furnace 31 includes a heater unit 32, and heats the laminated glass intermediate film 12 until a predetermined temperature is reached while the laminate 20 passes through the heating furnace 31. Thereafter, the laminate 20 is passed between nip rolls 34 formed of two pairs of opposing roll portions. The nip roll 34 is a device that continuously pressurizes what passes between the roll portions with a predetermined linear pressure. Thereby, the laminated body 20 is pressurized, and the heated intermediate film for laminated glass is pressure-bonded to the boundary surface between the two substrates. At this time, since the interlayer film for laminated glass is formed from the mixture of the two types of EVA as described above, air easily escapes from the interface between the interlayer film for laminated glass and the two substrates, and bubbles are not easily generated. ing.

  A conventionally well-known thing can be used for the conveying apparatus 33, the heating furnace 31, and the nip roll 34. FIG. The heating method of the heater unit 32 of the heating furnace 31 may be any method, and examples thereof include an infrared heating method and a hot air method. Instead of the heating furnace 31, a heating apparatus of a heating roll type may be used. The heating method is preferably an infrared heating method that can directly and uniformly heat the intermediate film. This makes it easy to control the heating temperature of the interlayer film and facilitates uniform melting of the EVA layer. Therefore, the interlayer film for laminated glass is spread evenly on the boundary surface with the glass plate when pressed by the nip roll. be able to. The heating is not particularly limited as long as the crosslinking agent that can be contained in the interlayer film for laminated glass does not react.

  The nip roll 34 may be any type and may have a plurality of pairs of nip rolls. Moreover, in order to avoid the temperature fall at the time of pressurization, what was comprised with the heating roll may be used. The linear pressure applied by the nip roll 34 is not particularly limited, but is generally 5 to 100 kN / m.

A laminated glass can be obtained by performing the process (heating bridge | crosslinking process) of heating and preliminarily pressure-bonding the laminated body 20 after the above-mentioned crimping | compression-bonding process. A conventionally well-known method can be used for a heat-crosslinking process. For example, high-temperature and high-pressure treatment such as autoclave can be used. There are no particular restrictions on the heating conditions, and the heating conditions are also adjusted by blending a crosslinking agent or the like contained in the EVA layer described later. Usually, heating is performed at 100 to 150 ° C. (particularly around 130 ° C.) for 10 minutes to 1 hour. Heating is preferably performed while pressurizing at a pressure of 1.0 × 10 ³ Pa to 5.0 × 10 ⁷ Pa. At this time, cooling after cross-linking of the laminate is generally performed at room temperature, and in particular, the faster the cooling, the better.

  When the heating and crosslinking step is performed, a laminated glass in which the laminated glass intermediate film EVA is crosslinked and the laminated glass interlayer film is firmly bonded can be obtained.

  Hereinafter, the present invention will be described by way of examples.

1. Manufacture of interlayer film for laminated glass Each material shown in the following table was supplied to a roll mill in each blending amount and kneaded at 80 ° C. to prepare a composition of an interlayer film for laminated glass. This composition was calendered at 80 ° C., allowed to cool, and then an interlayer film for laminated glass (thickness: 0.5 mm) was produced.

2. Manufacture of laminated glass A laminated body in which the produced interlayer film for laminated glass is sandwiched between two glass plates (size: 1000 mm × 1000 mm, thickness: 3 mm) is formed, as shown in FIG. Preliminary pressure bonding was performed at a temperature shown in the following table using a pressure bonding device having a heating device and a pressure device using a nip roll. In addition, the nip roll linear pressure at this time was 5-100 kN / m.
Next, a laminated glass was produced by pressurizing with an autoclave at a temperature of 130 ° C. for 30 minutes.
In each of the examples and comparative examples, the temperature of the interlayer film for laminated glass before press bonding by the nip roll was changed as shown in the following table. When heating is performed, the temperature at the end of the interlayer film for laminated glass tends to rise more than that at the center, and thus the temperatures at the center and the edge of the interlayer film for laminated glass before being pressed by the nip roll were measured.

3. Evaluation (1) Appearance A case where there was no air bubble that could be visually confirmed in the produced laminated glass was indicated as ◯, and a case where there was even one was indicated as ×.
(2) Viscosity change rate About the composition of the said intermediate film for laminated glasses, the viscosity (V65 _degreeC ) in _{65 degreeC} and the viscosity (V100 _degreeC ) in _{100 degreeC} are measured, and the viscosity change rate (65 degreeC to 100 degreeC ( %) Was calculated from the following formula.
Viscosity change rate (%) from 65 ° C. to 100 ° C. = (V _{65 ° C.−} V _{100 ° C.} ) / V _{65 ° C.} × 100
The measured viscosities were as follows.
Example 1
Viscosity at 65 ° C .: 1.6 × 10 ⁵ Pa · s
Viscosity at 100 ° C .: 1.2 × 10 ⁴ Pa · s
Example 2
Viscosity at 65 ° C .: 1.4 × 10 ⁵ Pa · s
Viscosity at 100 ° C .: 1.5 × 10 ⁴ Pa · s
Example 3
Viscosity at 65 ° C .: 1.2 × 10 ⁵ Pa · s
Viscosity at 100 ° C .: 1.6 × 10 ⁴ Pa · s
Comparative example 1
Viscosity at 65 ° C .: 2.2 × 10 ⁵ Pa · s
Viscosity at 100 ° C .: 1.0 × 10 ⁴ Pa · s
Comparative example 2
Viscosity at 65 ° C .: 6.9 × 10 ⁴ Pa · s
Viscosity at 100 ° C .: 1.9 × 10 ⁴ Pa · s
Comparative example 3
Viscosity at 65 ° C .: 1.4 × 10 ⁵ Pa · s
Viscosity at 100 ° C .: 1.0 × 10 ⁴ Pa · s
(3) Adhesive strength to glass About the produced laminated glass, a part between the glass plate and the interlayer film for laminated glass after crosslinking was peeled off, and the interlayer film for laminated glass was folded 180 ° to obtain a tensile tester (Shimadzu) Using an autograph manufactured by Seisakusho Co., Ltd., the peeling force at a pulling speed of 100 mm / min was measured as the adhesion force to glass (N / cm).

The results are shown in the table below. The details of each material are as follows.
EVA (1): vinyl acetate content 33% by mass, MFR 1.0 g / 10 min
EVA (2): vinyl acetate content 26 mass%, MFR 4.0 g / 10 min
EVA (3): vinyl acetate content 28% by mass, MFR 3.0 g / 10 min
Crosslinking agent: 2,5-dimethyl-2,5-di (t-butylperoxy) hexane Crosslinking aid: triallyl isocyanurate Silane coupling agent: γ-methacryloxypropyltrimethoxysilane UV absorber: ubinal 3049 ( (Made by BASF)

<Evaluation results>
In Examples 1-3, it was recognized that the laminated glass in which air bubbles do not remain can be produced in a wide temperature range, and the adhesiveness of the interlayer film for laminated glass is excellent. In Comparative Examples 1 and 3, bubbles remained. In Comparative Example 2, it was recognized that although no bubbles remained, the adhesiveness was poor.

11A, 11B Substrate 12 Intermediate film for laminated glass 20 Laminated body 31 Heating furnace 32 Heater part 33 Conveying device 34 Nip roll

Claims (5)

Ethylene-vinyl acetate copolymer having a vinyl acetate content of 30 to 40% by mass and a melt flow rate (according to JIS K7210, temperature 190 ° C., load 2.16 kg) of 0.1 to 1.0 g / 10 min. Combined A and ethylene-acetic acid having a vinyl acetate content of 20 to 26% by mass and a melt flow rate (according to JIS K7210, temperature 190 ° C., load 2.16 kg) of 2.0 to 10.0 g / 10 min. Formed from a resin composition comprising a mixture with vinyl copolymer B;
An interlayer film for laminated glass, wherein the mass ratio of the ethylene-vinyl acetate copolymer A to the ethylene-vinyl acetate copolymer B is 25/75 to 75/25. 2. The interlayer film for laminated glass according to claim 1, wherein the viscosity of the resin composition is 3.0 × 10 ⁵ mPa · s or less at 65 ° C. and 1.0 × 10 ⁴ mPa · s or more at 100 ° C. 3. The viscosity (V _{65 ° C.} ) at _{65 °} C. and the viscosity (V _{100 ° C.} ) at 100 ° C. of the resin composition are represented by the following formula (I)
(V _{65 ° C.-} V _{100 ° C.} ) / V _{65 ° C.} × 100 ≦ 91 (%) (I)
The interlayer film for laminated glass according to claim 1 or 2, satisfying the relationship:   The interlayer film for laminated glass according to any one of claims 1 to 3, which is for laminated glass produced by pressure-bonding two substrates and the interlayer film for laminated glass with a nip roll.   The manufacturing method of a laminated glass including the process of crimping | bonding the laminated body by which the intermediate film for laminated glasses of any one of Claims 1-3 was pinched | interposed between two board | substrates by a nip roll.

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