JPWO2019069373A1 - Resin film used for laminated glass interlayer film, laminated glass interlayer film material, laminated glass and method for manufacturing laminated glass - Google Patents

Abstract

The present invention relates to a resin film used for an interlayer film of laminated glass, in which the maximum value of tan δ in the frequency range of 100 to 100,000 Hz is 0.5 to 4.0 at 25 ° C.

Description

The present invention relates to a resin film used for an interlayer film of a laminated glass, a film material for an interlayer film of a laminated glass, a laminated glass, and a method for producing the laminated glass.

Currently, laminated glass is widely used as glass for windows, sunroofs, interior panels, etc. of vehicles such as automobiles because it is safe because glass fragments are less likely to scatter even if it is damaged by an external impact. .. Laminated glass is also used in windows of trains, aircraft, construction machinery, buildings, and the like.

As an example of the laminated glass, there is an example obtained by interposing an interlayer film for laminated glass made of a polyvinyl acetal resin such as polyvinyl butyral resin plasticized with a plasticizer between at least a pair of glass plates and integrating them. (See, for example, Patent Documents 1 to 3).

Japanese Unexamined Patent Publication No. 62-100463 Japanese Unexamined Patent Publication No. 2005-206445 International Publication No. 2012/091117

Most of the conventional laminated glass has the same degree of split resistance as the glass of the same thickness, but it is more difficult to break due to the impact applied from the outside and the laminated glass has high split resistance. Is required.

The present invention provides a resin film used for a laminated glass interlayer film and a film material for a laminated glass interlayer film capable of producing a laminated glass having excellent split resistance against an impact applied from the outside. The purpose is to do. Another object of the present invention is to provide a laminated glass having excellent impact resistance and split resistance and a method for producing the laminated glass by using the resin film.

The present invention provides a resin film used for an interlayer film of laminated glass, in which the maximum value of tan δ in the frequency range of 100 to 100,000 Hz is 0.5 to 4.0 at 25 ° C.

The resin film may be formed from a resin composition containing a polymer of a monomer containing a (meth) acryloyl compound, in which case the weight average molecular weight of the polymer may be 200,000 to 2000,000.

The (meth) acryloyl compound may contain an alkyl (meth) acrylate and a (meth) acrylate having a hydroxyl group. The content of the alkyl (meth) acrylate may be 50 to 95 parts by mass with respect to 100 parts by mass of the total amount of the monomers.

The resin composition may further contain a thermal cross-linking agent.

The resin film may have a haze of 10% or less.

The present invention also provides a film material for an interlayer film of laminated glass, comprising a base material and a resin layer provided on the base material, wherein the resin layer is a layer made of the resin film according to the present invention described above. provide.

The present invention also provides a laminated glass comprising two opposing glass plates and an interlayer film sandwiched between the two glass plates, wherein the interlayer film is the resin film according to the present invention described above. ..

The present invention is further a method for producing a laminated glass including two opposing glass plates and an interlayer film sandwiched between the two glass plates, via the resin film according to the present invention described above. Manufacture of laminated glass including a step of laminating two glass plates to obtain a laminated body and a step of heat-pressing the laminated body under the conditions of 30 to 150 ° C. and 0.3 to 1.5 MPa. Provide a method.

According to the present invention, there is provided a resin film and a film material for an interlayer film used as an interlayer film of a laminated glass capable of producing a laminated glass having excellent split resistance against an impact applied from the outside. Can be done. The present invention can also provide a laminated glass having excellent impact resistance and split resistance and a method for producing the laminated glass by using the resin film.

It is a schematic cross-sectional view which shows one Embodiment of the film material for the interlayer film of the laminated glass. It is a schematic cross-sectional view which shows one Embodiment of laminated glass. It is a figure which shows the master curve created about the tan δ value of the resin film of Example 2 and Comparative Example 3.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings in some cases. However, the present invention is not limited to the following embodiments.

<Definition>
In the present specification, the numerical range indicated by using "~" indicates a range including the numerical values before and after "~" as the minimum value and the maximum value, respectively. In the numerical range described stepwise in the present specification, the upper limit value or the lower limit value of the numerical range of one step may be replaced with the upper limit value or the lower limit value of the numerical range of another step. In the numerical range described in the present specification, the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples. “A or B” may include either A or B, or both. In the present specification, the content of each component in the composition is the total amount of the plurality of substances present in the composition unless otherwise specified, when a plurality of substances corresponding to each component are present in the composition. means.

As used herein, the term "(meth) acrylate" means at least one of "acrylate" and its corresponding "methacrylate". The same applies to other similar expressions such as (meth) acryloyl.

<Resin film used for the interlayer film of laminated glass>
The resin film used for the interlayer film of the laminated glass of the present embodiment has a maximum value of tan δ in the frequency range of 100 to 100,000 Hz at 25 ° C. of 0.5 to 4.0. The resin film is used, for example, to form an interlayer film of laminated glass including two glass plates facing each other and an interlayer film sandwiched between the two glass plates.

By forming an interlayer film of laminated glass using such a resin film, the interlayer film can dissipate energy due to the impact even when an impact is applied from the outside, and the laminated glass has a high crack resistance. Can express sex.

More specifically, when the maximum value of tan δ is 0.5 or more, the dissipative property of energy due to impact is improved, and the splitting property of the laminated glass can be improved. From such a viewpoint, the maximum value of tan δ is preferably 0.7 or more, more preferably 0.8 or more, and further preferably 1.0 or more. On the other hand, when the maximum value of tan δ is 4.0 or less, the plastic deformability is suppressed, so that the amount of deformation of the laminated glass when an impact is applied can be suppressed, and the laminated glass has high crack resistance. Can be improved. From such a viewpoint, the maximum value of tan δ is preferably 3.0 or less, more preferably 2.0 or less, further preferably 1.6 or less, and 1.4 or less. It is particularly preferable to have.

Here, the tan δ value can be calculated from the composite curve (master curve) obtained from the dynamic viscoelasticity measurement method and the time-temperature conversion law. More specifically, for example, according to a method based on JIS K 0129: 2005, first, using a dynamic viscoelasticity measuring instrument (TA Instrument Co., Ltd., product name "RSA-G2"), -70 to 100 The resin film is measured in the tensile measurement mode under the conditions of ° C., 0.05 / 0.5 / 5/50 Hz, and a strain amount of 1%. Next, from the obtained measurement results, a master curve is created with the reference temperature set to 25 ° C. using the WLF method or the Arrhenius law. Then, the maximum value of tan δ in the frequency range of 100 to 100,000 Hz can be read from the created master curve. The frequency range of 100 to 100,000 Hz here means one of the two pieces of glass that form a laminated glass by freely dropping a hard sphere from a displacement height of several centimeters to one meter and several tens of centimeters. This is the frequency range selected assuming the strain rate that occurs when a hard sphere collides with the glass.

その後、任意の温度Ｔにおける角周波数ωの値から下記式Ａにより基準温度Ｔ_０に対する角周波数ω’を算出することができ、角周波数ω’と計測されている動的粘弾性との関係を描くことにより、横軸を周波数に改めたマスターカーブを得ることができる。
α_Ｔ＝ω’／ω ・・・（Ａ）
なお、上述した一連の計算は、「ＲＳＡ−Ｇ２」に付帯のＴＲＩＯＳ Ｓｏｆｔｗａｒｅ（ＴＡインスツルメント、製品名）を用いて算出することが可能である。Hereinafter, specific means for creating the master curve will be described. First, from the measurement results of dynamic viscoelasticity obtained above, the time-temperature conversion factor α _T is calculated for each temperature value by the following WLF equation or Arrhenius equation.

After that, the angular frequency ω'with respect to the reference temperature T ₀ can be calculated from the value of the angular frequency ω at an arbitrary temperature T by the following formula A, and the relationship between the angular frequency ω'and the measured dynamic viscoelasticity can be calculated. By drawing, a master curve whose horizontal axis is changed to frequency can be obtained.
α _T = ω'/ ω ・ ・ ・ (A)
The series of calculations described above can be calculated using the TRIOS Software (TA instrument, product name) attached to "RSA-G2".

(Resin composition)
The resin film according to this embodiment can be formed from a resin composition. The composition of the resin composition is not particularly limited as long as the maximum value of tan δ in the resin film is within a desired range. The resin composition may contain, for example, a polymer having rubber elasticity.

(Polymer)
Examples of the polymer having rubber elasticity include urethane-based polymers, styrene-based polymers, acrylic-based polymers, vinyl chloride-based polymers, amide-based polymers, and olefin-based polymers. These polymers may be used alone or in combination of two or more. Above all, at least one selected from the group consisting of urethane-based polymers, styrene-based polymers and acrylic-based polymers from the viewpoint that the maximum value of tan δ in the resin film can be adjusted more efficiently within a desired range. It preferably contains seeds, and more preferably contains an acrylic polymer.

The polymer contained in the resin composition may be a polymer of a monomer containing a (meth) acryloyl compound, that is, a polymer having a structural unit derived from the (meth) acryloyl compound. The (meth) acryloyl compound means a compound having a (meth) acryloyl group in the molecule, and is preferably a compound having one (meth) acryloyl group in the molecule. However, in the present specification, the (meth) acryloyl compound does not include a silicon compound having an ethylenically unsaturated group, which will be described later.

Examples of the (meth) acryloyl compound include (meth) acrylic acid, (meth) acrylamide, (meth) acrylamide derivative, alkyl (meth) acrylate having a linear or branched alkyl group, and alkylene glycol chain ( It has a meta) acrylate, a (meth) acrylate having a hydroxyl group, a (meth) acrylate having an aromatic ring, a (meth) acrylate having an alicyclic group, a (meth) acryloylmorpholine, a tetrahydrofurfuryl (meth) acrylate and an isocyanate group. Examples include (meth) acrylate.

Examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, and n-pentyl (meth). Acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, dodecyl (meth) acrylate, stearyl (meth) acrylate, etc. Examples thereof include alkyl (meth) acrylates having an alkyl group having 1 to 18 carbon atoms. Among them, as the alkyl (meth) acrylate, n-butyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and n-octyl (meth) acrylate are preferable, and 2-ethylhexyl (meth) acrylate is preferable. More preferred. Also, alkyl acrylates are preferable to alkyl methacrylates. The alkyl (meth) acrylate may be used alone or in combination of two or more.

Examples of the (meth) acrylate having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 1-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 1-. Examples thereof include hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate and 1-hydroxybutyl (meth) acrylate.

Examples of the (meth) acrylate having an alkylene glycol chain include polyethylene such as diethylene glycol mono (meth) acrylate, triethylene glycol mono (meth) acrylate, tetraethylene glycol mono (meth) acrylate, and hexaethylene glycol mono (meth) acrylate. Glycol mono (meth) acrylate; Polypropylene glycol mono (meth) acrylate such as dipropylene glycol mono (meth) acrylate, tripropylene glycol mono (meth) acrylate, octapropylene glycol mono (meth) acrylate; dibutylene glycol mono (meth) Polybutylene glycol mono (meth) acrylates such as acrylates and tributylene glycol mono (meth) acrylates; methoxytriethylene glycol (meth) acrylate, methoxytetraethylene glycol (meth) acrylate, methoxyhexaethylene glycol (meth) acrylate, methoxyocta Ethylene glycol (meth) acrylate, methoxynona ethylene glycol (meth) acrylate, methoxyethylene glycol (meth) acrylate, methoxyheptapropylene glycol (meth) acrylate, ethoxytetraethylene glycol (meth) acrylate, butoxyethylene glycol (meth) acrylate, Examples thereof include alkoxypolyalkylene glycol (meth) acrylate such as butoxydiethylene glycol (meth) acrylate. Further, these alkylene glycol chain-containing (meth) acrylates may be used alone or in combination of two or more.

Examples of the (meth) acrylate having an aromatic ring include benzyl (meth) acrylate and phenoxyethyl (meth) acrylate. Examples of the (meth) acrylate having an alicyclic group include cyclohexyl (meth) acrylate, isobornyl (meth) acrylate and dicyclopentanyl (meth) acrylate. Examples of the (meth) acrylamide derivative include N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, and N-isopropyl (meth). Examples include acrylamide, N, N-diethyl (meth) acrylamide and N-hydroxyethyl (meth) acrylamide. Examples of the (meth) acrylate having an isocyanate group include 2- (2-methacryloyloxyethyloxy) ethyl isocyanate and 2- (meth) acryloyloxyethyl isocyanate.

The polymer according to this embodiment preferably contains a structural unit derived from an alkyl (meth) acrylate. The polymerization ratio of the alkyl (meth) acrylate is preferably 50 to 95% by mass, more preferably 50 to 90% by mass, and 50 to 85% by mass with respect to the total mass of the polymer. Is more preferable. When the polymerization ratio of the alkyl (meth) acrylate is in such a range, the adhesion between the resin layer and the adherend can be improved, so that the splitting property of the laminated glass can be further improved. Such a polymer can be obtained by polymerizing a monomer containing an alkyl (meth) acrylate at the same content ratio as the above-mentioned polymerization ratio.

The polymer according to this embodiment preferably contains a structural unit derived from a (meth) acrylate having a hydroxyl group. The polymerization ratio of the (meth) acrylate having a hydroxyl group is preferably 5 to 40% by mass, more preferably 10 to 35% by mass, and 10 to 30% by mass with respect to the total mass of the polymer. It is more preferable to have. When the polymerization ratio of the (meth) acrylate having a hydroxyl group is in such a range, the splitting property of the laminated glass can be further improved, and the transparency of the obtained resin film can be improved.

Transparency can be indexed by Haze. The haze is a value (%) representing turbidity, and is based on the total transmittance T _t of the light irradiated by the lamp and dropped in the sample and the transmittance T _{d of the} light diffused and scattered in the sample. It is calculated as T _d / T _t ) × 100. These are specified by JIS K 7136, and can be measured by a commercially available turbidity meter, for example, manufactured by Nippon Denshoku Industries Co., Ltd., product name "NDH-5000".

The (meth) acryloyl compound according to the present embodiment preferably contains an alkyl (meth) acrylate and a (meth) acrylate having a hydroxyl group from the viewpoint of improving the transparency of the laminated glass. In this case, the content of the alkyl (meth) acrylate may be 50 to 95 parts by mass, 50 to 90 parts by mass, or 50 to 85 parts by mass with respect to 100 parts by mass of the total amount of the monomers. Good. The content of the (meth) acrylate having a hydroxyl group may be 5 to 40 parts by mass or 10 to 30 parts by mass with respect to 100 parts by mass of the total amount of the monomers.

The (meth) acryloyl compound further contains a compound having a (meth) acryloyl group and a polar group such as a morpholino group, an amino group, a carboxyl group, a cyano group, a carbonyl group, a nitro group, and a group derived from an alkylene glycol group. You may. By containing the (meth) acrylate having a polar group, the adhesion between the resin layer and the adherend can be improved.

The monomer according to the present embodiment may contain a silicon compound having an ethylenically unsaturated group in addition to the above (meth) acryloyl compound. The silicon compound having an ethylenically unsaturated group has a group having an unsaturated bond such as a (meth) acryloyl group, a styryl group, a siliceous ester group, a vinyl group, and an allyl group, and silicon as a constituent atom. There is no particular limitation as long as it is a compound having. The silicon compound according to the present embodiment may be a siloxane compound or a silane compound, and for example, the compounds represented by the formulas (a), (b) or (c) may be used alone or in combination of two or more. You may.

In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² , R ³ , R ⁴ , R ⁵ , R ⁶ and R ⁷ each independently represent a hydrogen atom or a methyl group, and R ⁸ is a monovalent hydrocarbon. It represents a hydrogen group, L ¹ represents a divalent hydrocarbon group or a single bond in which an oxygen atom may intervene, and m represents an integer of 1 to 300.

In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² , R ³ , R ⁴ , R ⁵ , R ⁶ and R ⁷ each independently represent a hydrogen atom or a methyl group, and L ¹ and L ² respectively. It represents a divalent hydrocarbon group or single bond that may be independently interspersed with an oxygen atom, where n represents an integer from 1 to 300.

In the formula, R ¹ represents a hydrogen atom or a methyl group, R ⁹ , R ¹⁰ and R ¹¹ each independently represent a hydrogen atom or a monovalent hydrocarbon group, and L ³ may be mediated by an oxygen atom 2 Indicates a valent hydrocarbon group or single bond.

Examples of the monovalent hydrocarbon group include an alkyl group having 1 to 6 carbon atoms or a phenyl group. Examples of the divalent hydrocarbon group include an alkylene group having 1 to 20 carbon atoms.

In the polymer according to the present embodiment, the polymerization ratio of the monomer unit derived from the silicon compound is preferably 2 to 20% by mass and 4 to 10% by mass with respect to the total mass of the polymer. More preferred. When the polymerization ratio of the silicon compound is in such a range, the adhesion between the resin film and the adherend is improved, and the toughness of the laminated body is improved, so that the splitting property of the laminated glass is further improved. be able to.

The monomer may contain a compound having two or more (meth) acryloyl groups and a compound having a polymerizable group other than the (meth) acryloyl group as long as the effects of the present invention are not impaired. Examples of the compound having a polymerizable group other than the (meth) acryloyl group include acrylonitrile, styrene, vinyl acetate, ethylene, propylene and divinylbenzene.

The weight average molecular weight (Mw) of the polymer is preferably 200,000 to 20,000, preferably 500,000 to 1,500,000, which is converted by the gel permeation chromatography (GPC) method using a standard polystyrene calibration curve. More preferably, it is more preferably 600,000 to 1300000. When the Mw of the polymer is 200,000 or more, the adhesion to the adherend is improved, so that the splitting property of the laminated glass is further improved, and when it is 2000000 or less, the viscosity of the resin composition is high. It does not become too much, and the processability at the time of forming the resin film becomes good, and as a result, the splitting property of the laminated glass is further improved.

The polymer according to the present embodiment can be synthesized by using known polymerization methods such as solution polymerization, emulsion polymerization, suspension polymerization and bulk polymerization.

As a polymerization initiator when synthesizing a polymer, a compound that generates radicals by heat can be used. Examples of the polymerization initiator include organic peroxides such as benzoyl peroxide and lauroyl peroxide; 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile) and the like. Examples include azo compounds.

(Other additives)
If necessary, the resin composition may contain various additives together with the above-mentioned polymer.

As the additive, for example, a cross-linking agent may be used in order to enhance the cohesive force of the resin composition. Specific examples of the cross-linking agent include a photo-cross-linking agent and a thermal cross-linking agent.

Examples of the photocrosslinking agent include alkylenediol di (meth) acrylates having an alkylene group having 1 to 20 carbon atoms; alkylene glycol di (meth) acrylates such as polyethylene glycol di (meth) acrylate and polypropylene glycol di (meth) acrylate. Bisphenol A di (meth) acrylates such as ethoxylated bisphenol A di (meth) acrylates, ethoxylated bisphenol F di (meth) acrylates, bisphenol A type epoxy (meth) acrylates; and urethane di (meth) acrylates having urethane bonds. Can be mentioned.

The urethane di (meth) acrylate having a urethane bond may have a polyalkylene glycol chain from the viewpoint of good compatibility with other components, and has an alicyclic structure from the viewpoint of ensuring transparency. You may have. If the compatibility between the photocrosslinking agent and the polymer is high, the white turbidity of the resin film formed from the resin composition tends to be easily suppressed.

From the viewpoint of further suppressing the occurrence of bubbles and peeling under high temperature or high temperature and high humidity, the weight average molecular weight of the photocrosslinking agent is preferably 100,000 or less, more preferably 300 to 100,000, and more preferably 500 to 80,000. It is more preferable to have.

When the photocrosslinking agent is used, the content ratio is preferably 15% by mass or less, more preferably 10% by mass or less, and further preferably 7% by mass or less, based on the total mass of the polymer. preferable. Within such a range, a resin film having sufficient adhesion can be obtained. The lower limit of the content ratio of the photocrosslinking agent is not particularly limited, but from the viewpoint of improving the film formability, it is preferably 0.1% by mass or more, more preferably 2% by mass or more, and 3 It is more preferably mass% or more.

As the heat-crosslinking agent, for example, a heat-crosslinking agent such as an isocyanate compound, a melamine compound, or an epoxy compound can be used. As the heat-crosslinking agent, a polyfunctional heat-crosslinking agent such as trifunctional or tetrafunctional is more preferable from the viewpoint of forming a network structure gently spreading in the resin film and appropriately adjusting the flexibility of the resin film.

From the viewpoint of reactivity, an isocyanate compound is preferable, and a polyisocyanate compound is more preferable as the thermal cross-linking agent. Examples of the polyisocyanate compound include a polyfunctional hexamethylene diisocyanate compound which is a reaction product of a trimer of hexamethylene diisocyanate, a triol such as trimethylolpropane, a diol or a monofunctional alcohol, and hexamethylene diisocyanate. ..

When a thermal cross-linking agent is used, the content ratio is preferably 5% by mass or less, more preferably 2% by mass or less, and further preferably 1% by mass or less, based on the total mass of the polymer. preferable. Within such a range, a resin film having sufficient adhesion can be obtained. The lower limit of the content ratio of the thermal cross-linking agent is not particularly limited, but is preferably 0.01% by mass or more from the viewpoint of improving the film formability.

When either the polymer or the cross-linking agent is a curing system using active energy rays, a photopolymerization initiator may be contained. The photopolymerization initiator accelerates the curing reaction by irradiation with active energy rays. The active energy ray refers to ultraviolet rays, electron beams, α rays, β rays, γ rays and the like.

The photopolymerization initiator is not particularly limited, and known materials such as a benzophenone compound, an anthraquinone compound, a benzoyl compound, a sulfonium salt, a diazonium salt, and an onium salt can be used.

Examples of the photopolymerization initiator include benzophenone, N, N, N', N'-tetramethyl-4,4'-diaminobenzophenone (Michler ketone), N, N, N', N'-tetraethyl-4,4'. -Diaminobenzophenone, 4-methoxy-4'-dimethylaminobenzophenone, α-hydroxyisobutylphenone, 2-ethylanthraquinone, t-butylanthraquinone, 1,4-dimethylanthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-Chloro-2-methylanthraquinone, 1,2-benzoanthraquinone, 2-phenylanthraquinone, 1,4-naphthoquinone, 9,10-phenanthraquinone, thioxanthone, 2-chlorothioxanthone, 1-hydroxycyclohexylphenylketone, Aromatic ketone compounds such as 2,2-dimethoxy-1,2-diphenylethane-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,2-diethoxyacetophenone; benzoin, Benzoin compounds such as methylbenzoin and ethylbenzoin; benzoin ether compounds such as benzoin methyl ether, benzoin ethyl ether, benzoin isobutyl ether and benzoin phenyl ether; benzyl compounds such as benzyl and benzyl dimethyl ketal; β- (acrindin-9-yl) Ester compounds such as (meth) acrylic acid; aclysine compounds such as 9-phenylaclysin, 9-pyridylaclysin, 1,7-diacrydinoheptane; 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer , 2- (o-chlorophenyl) 4,5-di (m-methoxyphenyl) imidazole dimer, 2- (o-fluorophenyl) -4,5-diphenylimidazole dimer, 2- (o-methoxy) Phenyl) -4,5-diphenylimidazole dimer, 2- (p-methoxyphenyl) -4,5-diphenylimidazole dimer, 2,4-di (p-methoxyphenyl) 5-phenylimidazole dimer , 2- (2,4-dimethoxyphenyl) -4,5-diphenylimidazole dimer, 2- (p-methylmercaptophenyl) -4,5-diphenylimidazole dimer, etc. 2,4,5-tria Lilleimidazole dimer; 2-benzyl-2-dimethylamino-1- (4-molyholinophenyl) -1-butanone; 2-methyl-1- [4- (methylthio) phenyl] -2- Examples include morpholino-1-propane; bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide; oligo (2-hydroxy-2-methyl-1-(4- (1-methylvinyl) phenyl) propanone). .. A plurality of these compounds may be used in combination.

As the photopolymerization initiator, for example, 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methyl-1-phenyl-propane-1-one, 1- [4- (2) from the viewpoint of not coloring the resin composition. -Hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one and other α-hydroxyalkylphenone compounds; bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis ( Acylphosphine oxide compounds such as 2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide; oligo (2-hydroxy-2-methyl-1) -(4- (1-Methylvinyl) phenyl) propanone).

The photopolymerization initiator is, for example, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4- from the viewpoint of forming a particularly thick resin film. Acylphosphine oxide compounds such as trimethyl-pentylphosphine oxide and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide may be contained.

The content ratio of the photopolymerization initiator is preferably 0.05 to 5% by mass, more preferably 0.1 to 3% by mass, and 0.1 to 0.5% by mass with respect to the total mass of the resin composition. Mass% is more preferred. By setting the content ratio of the photopolymerization initiator to 5% by mass or less, the transmittance is high, the hue is less likely to be yellowish, and a resin film having excellent transparency tends to be easily obtained.

If necessary, the resin composition may contain an additive other than the cross-linking agent. Examples of the additive include a polymerization inhibitor such as paramethoxyphenol added for the purpose of enhancing the storage stability of the resin composition, and an additive for the purpose of enhancing the heat resistance of the interlayer film obtained by photocuring the resin composition. Antioxidants such as triphenylphosphite, light stabilizers such as HALS (Hindered Amine Light Stabilizer) added for the purpose of enhancing the resistance of the resin composition to light such as ultraviolet rays, and enhancing the adhesion of the resin composition to glass. Examples include silane coupling agents added for this purpose.

The resin composition may contain an inorganic filler, for example, crushed silica, molten silica, mica, clay minerals, short glass fibers or fine powder, hollow glass, calcium carbonate, quartz powder, metal hydrate. And so on. The content of the inorganic filler is preferably 0.01 to 100 parts by mass, more preferably 0.05 to 50 parts by mass, and 0.1 to 30 parts by mass with respect to 100 parts by mass of the resin composition based on the total solid content. The portion is more preferable. When the content of the inorganic filler is 0.01 to 100 parts by mass, sufficient low shrinkage, improvement in mechanical strength, low coefficient of thermal expansion and the like can be obtained. The dispersibility of the inorganic filler may be improved by treatment with a commercially available surface treatment agent such as a coupling agent, treatment with a disperser such as a triple roll, a bead mill, or a nanomizer.

<Film material for interlayer film of laminated glass>
The laminated glass film material of the present embodiment has a base material and a resin layer provided on the base material. The resin layer is a layer made of the resin film according to the present embodiment described above.

FIG. 1 is a schematic cross-sectional view showing an embodiment of a film material for an interlayer film of laminated glass. As shown in FIG. 1, the film material 1 for an interlayer film of the present embodiment includes a resin layer 11, one base material 10 laminated so as to sandwich the resin layer 11, and the other base material 12. You may.

As the base material 10, it is preferable to use a base material that is lightly peelable than the base material 12. Examples of the base material 10 include polymer films such as polyethylene terephthalate, polypropylene, and polyethylene, and among them, polyethylene terephthalate film (hereinafter, may be referred to as “PET film”) is preferable. From the viewpoint of workability, the thickness of the base material 10 is preferably 25 to 150 μm, more preferably 30 to 100 μm, and even more preferably 40 to 80 μm.

It is preferable that the planar shape of the base material 10 is larger than the planar shape of the resin layer 11, and the outer edge of the base material 10 projects outward from the outer edge of the resin layer 11. The width of the outer edge of the base material 10 overhanging the outer edge of the resin layer 11 is preferably 2 to 20 mm, preferably 4 to 10 mm, from the viewpoints of ease of handling, easy peeling, and reduction of adhesion of dust and the like. More preferably. When the planar shape of the resin layer 11 and the base material 10 is a substantially rectangular shape such as a substantially rectangular shape, the width of the outer edge of the base material 10 protruding from the outer edge of the resin layer 11 is 2 to 20 mm on at least one side. It is more preferably 4 to 10 mm on at least one side, further preferably 2 to 20 mm on all sides, and particularly preferably 4 to 10 mm on all sides.

As the base material 12, it is preferable to use a base material having a heavy peelability rather than the base material 10. Examples of the base material 12 include polymer films such as polyethylene terephthalate (PET), polypropylene, and polyethylene, and among them, PET film is preferable. From the viewpoint of workability, the thickness of the base material 12 is preferably 50 to 200 μm, more preferably 60 to 150 μm, and even more preferably 70 to 130 μm.

It is preferable that the planar shape of the base material 12 is larger than the planar shape of the resin layer 11, and the outer edge of the base material 12 projects outward from the outer edge of the resin layer 11. The width of the outer edge of the base material 12 projecting from the outer edge of the resin layer 11 is preferably 2 to 20 mm, preferably 4 to 10 mm, from the viewpoints of ease of handling, ease of peeling, and reduction of adhesion of dust and the like. More preferably. When the planar shape of the resin layer 11 and the base material 12 is a substantially rectangular shape such as a substantially rectangular shape, the width of the outer edge of the base material 12 protruding from the outer edge of the resin layer 11 is 2 to 20 mm on at least one side. It is more preferably 4 to 10 mm on at least one side, further preferably 2 to 20 mm on all sides, and particularly preferably 4 to 10 mm on all sides.

The peel strength between the base material 10 and the resin layer 11 is preferably lower than the peel strength between the base material 12 and the resin layer 11. As a result, the base material 12 is more difficult to peel off from the resin layer 11 than the base material 10. The peel strength can be adjusted, for example, by subjecting the base material 12 and the base material 10 to surface treatment. Examples of the surface treatment method include mold release treatment of the base material with a silicone-based compound or a fluorine-based compound.

As a method for forming the resin layer 11, a known technique can be used. For example, first, the resin composition according to the present embodiment is diluted with a volatile solvent such as 2-butanone, cyclohexanone, methyl ethyl ketone, ethyl acetate, and toluene to prepare a coating solution. Next, the coating liquid can be applied onto the base material 12 and removed by drying the solvent to form a resin layer having an arbitrary thickness. In preparing the coating liquid, each component may be blended and then diluted with a solvent, or each component may be diluted with a solvent in advance before blending. As the coating method, for example, known methods such as a flow coating method, a roll coating method, a gravure coating method, a wire bar coating method, and a lip die coating method can be used.

By forming the resin layer 11 on the base material 12 and then laminating the base material 10 on the resin layer 11, the film material for an interlayer film according to the present embodiment is produced. The resin layer 11 is sandwiched between the base material 10 and the base material 12. In order to control the peelability between the resin layer 11 and the base material 10 and the base material 12, the resin composition may contain a surfactant such as a polydimethylsiloxane-based surfactant or a fluorine-based surfactant. Good.

The thickness of the resin layer 11 is not particularly limited because it is appropriately adjusted depending on the intended use and method, but may be 10 to 5000 μm, 25 to 200 μm, 25 to 180 μm, or 25 to 150 μm. When used in this range, an interlayer film for laminated glass having even better split resistance against an impact applied from the outside can be obtained.

The light transmittance of the resin layer 11 with respect to light in the visible light region (wavelength: 380 nm to 780 nm) is preferably 80% or more, more preferably 90% or more, still more preferably 95% or more. ..

The haze of the resin layer 11 is preferably 10% or less, more preferably 5% or less, further preferably 3% or less, and particularly preferably 1% or less. When the haze of the resin layer 11 is 10% or less, it becomes easy to detect appearance defects such as environmental foreign substances mixed in the manufacturing process of the film material for the interlayer film and the laminated glass, and the visibility as the laminated glass is sufficiently ensured. can do.

According to the film material 1 for an interlayer film according to the present embodiment, storage and transportation can be facilitated without damaging the resin layer 11.

As the interlayer film, the resin layer 11 can be attached to, for example, glass to each other, glass and a transparent substrate (or transparent film) made of resin, or a transparent substrate (or transparent film) made of resin.

<Laminated glass>
The interlayer film of the laminated glass according to the present embodiment (hereinafter, may be simply referred to as “intermediate film”) can be applied to various laminated glasses. The laminated glass includes two opposing glass plates and an interlayer film sandwiched between the two glass plates, and the interlayer film is a film made of the resin film according to the present embodiment. The method for producing a laminated glass according to the present embodiment includes a step of laminating two glass plates via the resin film described above to obtain a laminated body, and conditions of 30 to 150 ° C. and 0.3 to 1.5 MPa. The step of heat-pressing the laminated body is included.

Examples of the glass include float glass, wind-cooled tempered glass, chemically tempered glass and double glazing.

The thickness of the glass may be, for example, 0.1 to 50 mm, 0.5 to 30 mm, 1 to 20 mm, or 2 to 10 mm.

FIG. 2 is a side sectional view schematically showing an embodiment of laminated glass. In the laminated glass 2 shown in FIG. 2, the float glass 20, the interlayer film 21, and the float glass 22 are laminated in this order. The laminated glass 2 shown in FIG. 2 can be manufactured, for example, by the following method.

First, the base material 10 in the film material 1 for an interlayer film is peeled from the resin layer 11 to expose the surface of the resin layer 11. Next, the surface of the resin layer 11 to be the interlayer film 21 is attached to the float glass 20 which is the first adherend, pressed by a roller or the like, and then the base material 12 is peeled from the resin layer 11 to expose the surface. .. Subsequently, the surface of the resin layer 11 is attached to the float glass 22 which is the second adherend, and is subjected to heat and pressure treatment (autoclave treatment), and the float glass 20 and the float glass 20 and the like are passed through the interlayer film 21 (resin layer 11). Laminated glass 2 in which 21 is bonded is produced.

By using the resin layer 11, the adherends can be easily bonded to each other without wrinkles. Further, the step of heat and pressurization treatment can be performed at a low temperature for a short time. By using the resin layer 11, the stable transparency of the laminated glass 2 can be maintained without whitening the interlayer film 21.

The conditions for the heat and pressurization treatment are a temperature of 30 to 150 ° C. and a pressure of 0.3 to 1.5 MPa, but from the viewpoint of further removing entrained bubbles, the temperature is 50 to 70 ° C. and 0.3 to 0. It may be .5 MPa. The treatment time is preferably 5 to 60 minutes, more preferably 10 to 30 minutes.

In the above, glass is used as the second adherend, but the second adherend may be a transparent substrate made of resin. Examples of the transparent substrate include a transparent plastic substrate such as an acrylic resin substrate, a polycarbonate substrate, a cycloolefin polymer substrate, and a polyester substrate.

The interlayer film according to the present embodiment is formed by combining a laminated glass with a functional layer having functionality such as an antireflection layer, an antifouling layer, a dye layer, a hard coat layer, a sound insulation layer, and a heat insulation layer, or another resin layer. It may be used to match. That is, the interlayer film according to the present embodiment may have a single-layer structure in which the resin layer is one layer, or may have a multi-layer structure in which two or more layers are laminated.

The antireflection layer may be a layer having an antireflection property having a visible light reflectance of 5% or less. As the antireflection layer, a layer treated by a known antireflection method on a transparent base material such as a transparent plastic film can be used.

The antifouling layer is for making it difficult for the surface to get dirty. As the antifouling layer, a known layer made of a fluorine-based resin, a silicone-based resin, or the like can be used in order to reduce the surface tension.

The dye layer is used to increase the color purity and is used to reduce the light of an unnecessary wavelength transmitted through the laminated glass. The dye layer can be obtained by dissolving a dye that absorbs light of an unnecessary wavelength in a resin and forming or laminating it on a base film such as a polyethylene film or a polyester film.

The hard coat layer is used to increase the surface hardness. As the hard coat layer, for example, an acrylic resin such as urethane acrylate or epoxy acrylate; a film formed or laminated on a base film such as a polyethylene film of an epoxy resin or the like can be used. Similarly, in order to increase the surface hardness, a hard coat layer formed or laminated on a transparent protective plate such as glass, acrylic resin, or polycarbonate can also be used.

As the sound insulation layer, a known film layer can be used as long as it has a function of controlling a loss coefficient (dB) when sound having a frequency of 100 to 10,000 Hz passes through the laminated glass.

The heat shield layer may be any one having a function of absorbing or reflecting light rays in the infrared region (wavelength of 780 nm or more), and a known film layer can be used.

The other resin layer is not particularly limited as long as it does not impair the effects of the present invention. Examples of the resin used for such a resin layer include polyvinyl acetal resins such as polyvinyl butyral resin, ethyl vinyl alcohol resins, and ionomers.

In the case of such a laminated body, the resin layer 11 can be laminated by using a roll laminating machine, a vacuum laminating machine or a single-wafer laminating machine.

According to the method for producing a laminated glass according to the present embodiment, it is possible to produce a laminated glass having excellent split resistance against an impact applied from the outside.

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

The weight average molecular weight (Mw) of the polymer produced in the production example was measured by using a calibration curve using standard polystyrene according to the GPC method and using the following GPC measuring device and measuring conditions.

RI detector: L-3350 (Hitachi High-Tech Science Corporation, product name)
Eluent: THF
Column: Gelpac GL-R420 + R430 + R440 (Hitachi Chemical Co., Ltd., product name)
Column temperature: 40 ° C
Flow rate: 2.0 mL / min

<Preparation of polymer>
Manufacturing example 1
Add 80.0 g of 2-ethylhexyl acrylate, 20.0 g of 2-hydroxyethyl acrylate and 145.0 g of ethyl acetate to a reaction vessel equipped with a condenser, a thermometer, a stirrer, a dropping funnel and a nitrogen introduction tube, and add 100 mL / min. It was heated from room temperature (25 ° C.) to 65 ° C. for 15 minutes while substituting nitrogen with the air volume of. Then, while keeping the temperature at 65 ° C., a solution prepared by dissolving 0.1 g of lauroyl peroxide in 5.0 g of ethyl acetate was added and reacted for 8 hours to prepare a solution of polymer A-1 (Mw900000) having a solid content concentration of 40%. Obtained.

Manufacturing example 2
The same procedure as in Production Example 1 was carried out except that 80.0 g of 2-ethylhexyl acrylate, 10.0 g of 2-hydroxyethyl acrylate, 10.0 g of acryloyl morpholine and 145.0 g of ethyl acetate were added to the reaction vessel, and the solid content concentration was increased. A solution of 40% polymer A-2 (Mw700,000) was obtained.

Manufacturing example 3
Same as Production Example 1 except that 80.0 g of 2-ethylhexyl acrylate, 15.0 g of 2-hydroxyethyl acrylate, 5.0 g of one-terminal methacryloyl-modified polysiloxane compound (Mw12000) and 145.0 g of ethyl acetate were added to the reaction vessel. A solution of polymer A-3 (Mw850000) having a solid content concentration of 40% was obtained.

Manufacturing example 4
Polymer A having a solid content concentration of 40% was operated in the same manner as in Production Example 1 except that 80.0 g of n-butyl acrylate, 20.0 g of 4-hydroxybutyl acrylate and 145.0 g of ethyl acetate were added to the reaction vessel. A solution of -4 (Mw1250000) was obtained.

Production example 5
To the reaction vessel, 90.0 g of 2-ethylhexyl acrylate, 10.0 g of 2-hydroxyethyl acrylate and 145.0 g of ethyl acetate were added, and the same procedure as in Production Example 1 was carried out except that the reaction time was set to 6 hours. A solution of polymer A-5 (Mw100,000) having a concentration of 40% was obtained.

Production example 6
78.5 g of n-butyl acrylate, 19.5 g of 2-ethylhexyl acrylate, 2.0 g of acrylic acid and 100.0 g of ultrapure water in a reaction vessel equipped with a cooling tube, a thermometer, a stirrer, a dropping funnel and a nitrogen introduction tube. As a stabilizer, 1.0 g of polyvinyl alcohol was added, and the mixture was heated from room temperature (25 ° C.) to 65 ° C. for 15 minutes while substituting nitrogen with an air volume of 100 ml / min. Then, while keeping the temperature at 65 ° C., 0.1 g of t-butylperoxy-2-ethylhexanoate was added, reacted for 6 hours, and water was distilled off to obtain polymer A-6 (Mw2200000). It was.

<Preparation of film material for interlayer film of laminated glass>
Example 1
0.2 parts by mass of a polyisocyanate compound (Tosoh Corporation, product name "Coronate HL") was mixed with 100 parts by mass of the polymer of the A-1 solution obtained in Production Example 1 as a thermal cross-linking agent. A coating solution of the resin composition was prepared.

Next, a coating liquid of the above resin composition was applied to a PET film (base material 12) having a thickness of 75 μm, which had been mold-released on the surface, using a bar coater so that the thickness after drying was 100 μm, and at 100 ° C. It was heated and dried for 10 minutes to form a resin layer (resin film). Then, a PET film (base material 10) having a thickness of 75 μm, which had been subjected to a mold release treatment, was placed on the resin layer and attached with a 1.0 kgf hand roller to prepare a film material for an interlayer film of laminated glass.

Example 2
A coating liquid and a film material of the resin composition were obtained in the same manner as in Example 1 except that the solution of the polymer A-2 obtained in Production Example 2 was used.

Example 3
The same as in Example 1 except that the solution of the polymer A-3 obtained in Production Example 3 was used and the operation of applying the polymer A-3 to a thickness of 200 μm after drying was repeated twice to give a total thickness of 400 μm. A coating solution and a film material of the resin composition were obtained.

Example 4
A coating liquid and a film material of the resin composition were obtained in the same manner as in Example 1 except that the solution of the polymer A-4 obtained in Production Example 4 was used.

Comparative Example 1
The same as in Example 1 except that the solution of the polymer A-5 obtained in Production Example 5 was used and the operation of applying the polymer A-5 to a thickness of 200 μm after drying was repeated twice to give a total thickness of 400 μm. A coating solution and a film material of the resin composition were obtained.

Comparative Example 2
A coating liquid and a film material of the resin composition were obtained in the same manner as in Example 1 except that the solution of the polymer A-6 obtained in Production Example 6 was used.

Comparative Example 3
Polyvinyl butyral resin (acetalization degree 68.0 mol%, vinyl acetate component ratio 0.6 mol%) 100 in which the half-value width of the peak corresponding to the hydroxyl group obtained when the infrared absorption spectrum is measured is 245 cm ^-1. A mass portion and 38 parts by mass of triethylene glycol di-2-ethylhexanoate as a plasticizer were mixed, sufficiently melt-kneaded with a mixing roll, and then press-molded at 150 ° C. for 30 minutes with a press molding machine. A resin film having a thickness of 380 μm was obtained, and this was used as an interlayer film for laminated glass.

<Evaluation of resin film>
The resin films obtained in each Example and Comparative Example were evaluated by the following methods. The results are shown in Table 1.

1. 1. Measurement of maximum tan δ value The film material for interlayer film obtained in Examples 1 to 4 and Comparative Examples 1 and 2 was cut into a size of 10 mm × 40 mm, and the base material 10 and the base material 12 were peeled off to measure the tan δ value. Sample (resin film) for use was obtained. Further, in Comparative Example 3, the resin film was cut into a size of 10 mm × 40 mm to obtain a sample for measuring the tan δ value.

The obtained sample was set in a dynamic viscoelasticity measuring instrument (TA Instrument Co., Ltd., product name "RSA-G2") so that the measurement length was 20 mm, and the temperature was -70 to 100 ° C., 0.05. The measurement was performed in the tensile measurement mode under the conditions of /0.5 / 5/50 Hz and the strain amount of 1%. Next, from the obtained measurement results, a master curve was created with the reference temperature set to 25 ° C. using the Arrhenius law, and the maximum value of tan δ in the frequency range of 100 to 100,000 Hz was read from the obtained master curve. .. The master curve was created using TRIOS Software (TA instrument, product name) attached to "RSA-G2". FIG. 3 shows the master curves created for the tan δ values of the resin films of Example 2 and Comparative Example 3.

2. 2. Measurement of Haze The film materials for interlayer films of Examples 1 to 4 and Comparative Examples 1 and 2 were cut into a size of 50 mm × 50 mm, and the base material 10 was peeled off to expose one surface of the resin layer, which was then exposed. A double-sided tape was attached to the frame of the resin layer, and the turbidity meter (Nippon Denshoku Industries Co., Ltd., product name "NDH-5000") was set on the measurement site via the double-sided tape. Next, the base material 12 was peeled off from the resin layer to expose the other surface of the resin layer, and the haze of the resin layer was measured. Further, in Comparative Example 3, a resin film was cut out to a size of 50 mm × 50 mm, a double-sided tape was attached to the frame, and the resin film was set on the measurement site of a turbidity meter (Nippon Denshoku Industries Co., Ltd., product name “NDH-5000”). Then the haze was measured.

<Making laminated glass>
In Examples 1 to 4 and Comparative Examples 1 and 2, the base material 10 was peeled off from the produced film material for an interlayer film to expose the surface of the resin layer, and then the surface of the resin layer was 110 mm long, 110 mm wide, and thick. It was attached to a 2.7 mm float glass and pressed with a roller. Next, the base material 12 is peeled off from the resin layer to expose the surface of the resin layer, and the surface of the resin layer is attached to a float glass having a length of 110 mm, a width of 110 mm, and a thickness of 2.7 mm in a vacuum state using a vacuum laminating machine. A laminate was prepared by attaching. Then, the laminated body was heat-pressurized using an autoclave under the conditions of a temperature of 50 ° C., a pressure of 0.5 MPa, and holding for 30 minutes to obtain a laminated glass.

Further, in Comparative Example 3, a resin film was sandwiched between float glasses and autoclaved under the conditions of a temperature of 135 ° C., a pressure of 115 N / cm ² MPa, and holding for 60 minutes to obtain a laminated glass.

<Evaluation of laminated glass>
The laminated glass obtained in each Example and Comparative Example was evaluated by the following method. The results are shown in Table 1.

3. 3. Impact resistance test A steel ball with a mass of 1040 g and a diameter of 63.5 mm is placed at a position within 25 mm from the center point of the laminated glass supported at the periphery, 110 mm long and 110 mm wide, from a height of 5 cm to a height of 5 cm. Was raised and dropped in sequence, and the height when the glass was broken was recorded. Six sheets of each laminated glass were tested, the average height thereof was calculated, and the laminated glass showing a value of 50 cm or more was designated as a laminated glass having high split resistance.

1 ... film material for interlayer film, 2 ... laminated glass, 10, 12 ... base material, 11 ... resin layer, 20, 22 ... float glass, 21 ... interlayer film.

Claims (9)

A resin film used for an intermediate film of laminated glass, wherein the maximum value of tan δ in the frequency range of 100 to 100,000 Hz at 25 ° C. is 0.5 to 4.0. Formed from a resin composition containing a polymer of monomers containing a (meth) acryloyl compound,
The resin film according to claim 1, wherein the polymer has a weight average molecular weight of 200,000 to 2000,000. The resin film according to claim 2, wherein the (meth) acryloyl compound contains an alkyl (meth) acrylate and a (meth) acrylate having a hydroxyl group. The resin film according to claim 3, wherein the content of the alkyl (meth) acrylate is 50 to 95 parts by mass with respect to 100 parts by mass of the total amount of the monomers. The resin film according to any one of claims 2 to 4, wherein the resin composition further contains a thermal cross-linking agent. The resin film according to any one of claims 1 to 5, wherein the haze is 10% or less. An interlayer film of a laminated glass, comprising a base material and a resin layer provided on the base material, wherein the resin layer is a layer made of the resin film according to any one of claims 1 to 6. Film material for. A laminated glass having two glass plates facing each other and an interlayer film sandwiched between the two glass plates, wherein the intermediate film is the resin film according to any one of claims 1 to 6. Glass. A method for producing a laminated glass, comprising two glass plates facing each other and an interlayer film sandwiched between the two glass plates.
A step of laminating the two glass plates to obtain a laminate via the resin film according to any one of claims 1 to 6.
A step of heat-pressurizing the laminate under the conditions of 30 to 150 ° C. and 0.3 to 1.5 MPa, and
A method for manufacturing laminated glass, including.

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