JP2020056013A - Resin composition, anti-fog film and multilayer body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition having excellent transparency and anti-fog property, and to provide a film having excellent transparency and anti-fog property and which does not cause whitening or stickiness even when stored for a long time. SOLUTION: The acrylic resin containing the rubber-containing polymer (A) and the polyalkyl glycol copolymer (B) are contained, and the polyalkyl glycol copolymer (B) is contained in an amount of 1% by mass or more and less than 20% by mass. Resin composition. [Selection diagram] None

Description

  The present invention relates to a resin composition and an anti-fog film. Specifically, the present invention relates to a resin composition and a film containing an acrylic resin and a polyalkyl glycol copolymer and having excellent transparency and antifogging property, and further relates to a multilayer body provided with the film.

  Conventionally, acrylic resin films are excellent in transparency and weather resistance and have high surface hardness. For example, various molded articles for indoor or outdoor use, such as optical parts of electric products, interior parts of automobiles, signboards, building materials, etc. And is preferably used as a film for protecting the surface. When an acrylic resin film is used outdoors such as a signboard or a building material, it is required that the film surface be subjected to an anti-fog treatment so as to suppress a decrease in visibility due to water droplets such as rain.

As a method for imparting anti-fogging property to a film, a method of forming an anti-fogging layer by coating is known. For example, Patent Documents 1 and 2 propose a method of coating a hydrophilic layer using polyethylene oxide, polyvinyl alcohol, or colloidal silica.
As a method of blending a hydrophilic resin, Patent Document 3 proposes a compounding method using a polyalkylene oxide copolymer.

Japanese Patent Application No. 11-94179 Japanese Patent Application No. 2012-70594 Japanese Patent Application No. 10-118496

However, the functionalization by coating described in Patent Literatures 1 and 2 has a problem in that it requires complicated equipment due to complicated steps, increases costs, and cannot be easily performed.
Further, the method of blending a hydrophilic resin described in Patent Document 3 is a proposal for imparting antistatic performance, and studies on the hydrophilicity of the film surface by the blending method have been insufficient.
The present invention has been made in view of the above circumstances, and provides a resin composition having excellent transparency and anti-fogging property, and has excellent transparency and anti-fogging property. An object of the present invention is to provide a film free from stickiness.

  As a result of intensive studies, the present inventors have found that the above problems can be easily solved, and have completed the present invention.

  That is, an object of the present invention is to provide an acrylic resin containing a rubber-containing polymer (A) and a polyalkyl glycol copolymer (B), wherein the polyalkyl glycol copolymer (B) is contained in an amount of 1% by mass to 20% by mass. Solvent composition containing less than mass%.

  The resin composition of the present invention has excellent transparency and antifogging property. Further, the film obtained from this resin composition is excellent in transparency and antifogging property, and does not cause whitening or stickiness even when stored for a long time. Since this film can maintain its anti-fog property even under high temperature and high humidity, it can be suitably used for outdoor applications such as signboards and building materials.

  Hereinafter, details of the present invention will be described.

<Resin composition>
The resin composition of the present invention (hereinafter, may be referred to as “the present resin composition”) contains an acrylic resin containing a rubber-containing polymer (A), and a polyalkyl glycol copolymer (B), A resin composition containing the polyalkyl glycol copolymer (B) in an amount of 1% by mass or more and less than 20% by mass. By adopting such a configuration, the present film becomes excellent in transparency and antifogging property.

  The content of the acrylic resin in the present resin composition is preferably from 80% by mass to 99% by mass. The lower limit is more preferably 82% by mass or more, further preferably 83% by mass or more, and particularly preferably 84% by mass or more. On the other hand, the upper limit is more preferably 97% by mass or less, further preferably 95% by mass or less, and particularly preferably 93% by mass or less. When the content is 80% by mass or more, the heat resistance can be practically used, and when the content is 99% by mass or less, the antifogging property can be practically used.

  The content of the polyalkyl glycol copolymer (B) in the present resin composition is preferably 1% by mass or more and less than 20% by mass. The lower limit is more preferably 3% by mass or more, further preferably 5% by mass or more, and particularly preferably 7% by mass or more. On the other hand, the upper limit is more preferably less than 18% by mass, further preferably less than 17% by mass, and particularly preferably less than 16% by mass. When the content is 1% by mass or more, the resin composition has antifogging property. On the other hand, when the content is less than 20% by mass, the heat resistance is maintained, and the antifogging property due to excessive bleed out can be prevented from lowering.

  Since the acrylic resin and the polyalkyl glycol copolymer are compatible systems, they can be blended without impairing transparency. By having the polyalkyl glycol copolymer in the acrylic resin, hydrophilicity can be imparted to the acrylic resin. Haze can be expressed. In addition, it is considered that by including a rubber polymer in the acrylic resin, the polyalkyl glycol copolymer easily migrates to the film surface, and contributes to the development of antifogging property.

  In addition, the present resin composition is a heat stabilizer, an antioxidant, an ultraviolet absorber, a light stabilizer, an antibacterial / antifungal agent, an antistatic agent, a lubricant, a pigment, a dye, etc., as long as the effects of the present invention are not impaired. May be included.

  Hereinafter, the acrylic resin and the polyalkyl glycol polymer (B) constituting the present resin composition will be described in detail.

<Acrylic resin>
The acrylic resin in the present invention contains the rubber-containing polymer (A). The rubber-containing polymer (A) will be described below.

  Hereinafter, a preferred form of the acrylic resin will be specifically described. In the following description, “alkyl acrylate” and “alkyl methacrylate” mean an alkyl ester of acrylic acid and an alkyl ester of methacrylic acid, respectively. Further, “alkyl (meth) acrylate” means alkyl acrylate and / or alkyl methacrylate.

The rubber-containing polymer (A) is a polymer containing the rubber polymer (A ′).
Specifically, the rubber-containing polymer (A) is a step of polymerizing a monomer component (a) containing 30% by mass or more of an alkyl acrylate to produce a rubber polymer (A ′); It is a polymer produced through a step of polymerizing a monomer component (b) containing 51% by mass or more of an alkyl methacrylate in the presence of a combination (A ′).
The monomer component (a) is preferably a component that has a glass transition temperature (Tg) of −50 to 25 ° C. of a polymer obtained by polymerizing the monomer component alone. In addition, the monomer component (b) is preferably a component having a Tg of 70 to 120 ° C. of a polymer obtained by polymerizing the monomer component alone.

Prior to the polymerization of the monomer component (a), a step of emulsion-polymerizing the component (s) having a Tg of 70 to 120 ° C. of a polymer obtained by polymerizing the monomer component alone may be included. Further, between the emulsion polymerization step of the monomer component (a) and the emulsion polymerization step of the monomer component (b), a step of emulsion-polymerizing the monomer component (c) or the like may be included as necessary. Can be.
Further, the acrylic resin containing the rubber-containing polymer (A) used in the present invention may contain a thermoplastic polymer in addition to the rubber-containing polymer (A).

The thermoplastic polymer contains 50 to 100% by mass of an alkyl methacrylate unit having an alkyl group having 1 to 4 carbon atoms, and 0 to 50% by mass of at least one other vinyl monomer unit. And a thermoplastic polymer having a reduced viscosity of 0.1 L / g or less. The reduced viscosity is measured at 25 ° C. by dissolving 0.1 g of the polymer in 100 ml of chloroform.
The content of the alkyl methacrylate unit is preferably from 70 to 100% by mass. Moreover, it is preferable that Tg of a thermoplastic polymer is 80-110 degreeC. Specific examples of such a thermoplastic polymer include, for example, “Acrypet VH”, “Acripet MD”, and “Acripet MF” (all trade names) manufactured by Mitsubishi Chemical Corporation.
When a thermoplastic polymer is contained, the amount of the thermoplastic polymer is preferably 100 parts by mass or less, more preferably 90 parts by mass or less, even more preferably 80 parts by mass or less based on 100 parts by mass of the rubber-containing polymer (A). On the other hand, the lower limit is not particularly limited, but the thermoplastic polymer is preferably at least 1 part by mass based on 100 parts by mass of the rubber-containing polymer (A).

  Hereinafter, the monomer components constituting the rubber-containing polymer (A) will be described, and then the polymerization method of the rubber-containing polymer (A) will be described.

[Monomer component (a)]
The monomer component (a) is a monomer mixture containing 30% by mass or more of an alkyl acrylate based on 100% by mass of the total amount of the monomers, and is a monomer that is a raw material for the first-stage polymerization. It is a mixture. The rubber polymer (A ') is produced by polymerizing the monomer component (a) as a raw material.
As the alkyl acrylate (hereinafter sometimes referred to as “monomer (a1)”), the alkyl group may be linear or branched. Examples include methyl acrylate, ethyl acrylate, n-, i-propyl acrylate, n-, i-, t-butyl acrylate, 2-ethylhexyl acrylate, and n-octyl acrylate. Of these, n-butyl acrylate is preferred. These may be used alone or in combination of two or more.

  Examples of the monomer other than the alkyl acrylate in the monomer component (a) include alkyl methacrylate (hereinafter, sometimes referred to as “monomer (a2)”) and other monofunctional monomers ( Hereinafter, it may be referred to as "monofunctional monomer (a3)") and polyfunctional monomer (hereinafter sometimes referred to as "polyfunctional monomer (a4)"). .

  Examples of the alkyl methacrylate include those in which the alkyl group is linear or branched. Examples include methyl methacrylate, ethyl methacrylate, n-, i-propyl methacrylate and n-, i-, t-butyl methacrylate. These may be used alone or in combination of two or more.

  Examples of the monofunctional monomer (a3) include acrylic monomers such as alkoxy acrylate, cyanoethyl acrylate, acrylamide, and (meth) acrylic acid; and aromatic vinyl monomers such as styrene and alkyl-substituted styrene. And vinyl cyanide monomers such as acrylonitrile and methacrylonitrile. These may be used alone or in combination of two or more.

  Examples of the polyfunctional monomer (a4) include ethylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, 1,4-butylene glycol di (meth) acrylate, Alkylene glycol di (meth) acrylates such as propylene glycol (meth) acrylate; polyvinylbenzene such as divinylbenzene and trivinylbenzene; cyanurate-based monomers such as triallyl cyanurate and triallyl isocyanurate; and allyl methacrylate And allyl, methallyl or crotyl esters of α, β-unsaturated carboxylic acids or dicarboxylic acids. These may be used alone or in combination of two or more.

The content of each component in the monomer component (a) is preferably in the following range.
Alkyl acrylate is 30 to 99.9% by mass, alkyl methacrylate is 0 to 69.9% by mass, monofunctional monomer (a3) is 0 to 20% by mass, and polyfunctional monomer (a4) is 0.1 to 10% by mass.

The Tg of the rubber polymer (A ′) is preferably −50 to 25 ° C. from the viewpoint of flexibility as a film. In the present invention, Tg refers to a value calculated from the FOX equation using a value described in a polymer handbook (J. Brandrup, Interscience, 1989).
In addition, the content of the rubber polymer (A ′) in the rubber-containing polymer (A) is preferably from 5 to 70% by mass from the viewpoint of film-forming properties as a film.
The monomer component (a) in the rubber-containing polymer (A) may be polymerized in two or more stages.

[Monomer component (b)]
The monomer component (b) is a monomer mixture serving as a raw material for the final stage of polymerization, and is a component that affects the moldability and mechanical properties of the rubber-containing polymer (A). As the alkyl methacrylate in the monomer component (b), one or more monomers listed as “monomer (a2)” in the description of the monomer component (a) can be used. The other monomer in the monomer component (b) may be an alkyl acrylate or another monofunctional monomer (hereinafter, referred to as “monofunctional monomer (b3)”). )). As the alkyl acrylate, one or more monomers listed as “monomer (a1)” can be used.
As the monofunctional monomer (b3), one or more monomers listed as “monofunctional monomer (a3)” can be used.

The step of emulsion-polymerizing the monomer component (b) can be performed in two or more stages.
The content of each component in the monomer component (b) is preferably in the following range.
Alkyl methacrylate is 51 to 100% by mass, alkyl acrylate is 0 to 20% by mass, and monofunctional monomer (b3) is 0 to 49% by mass.

  The amount of the monomer component (b) used in 100% by mass of the total amount of the monomer components used in all the steps of the polymerization method is preferably from 30 to 95% by mass from the viewpoint of film forming properties.

[Monomer component (s)]
Prior to the step of polymerizing the monomer component (a) to produce the rubber polymer (A ′), a component (s) having a Tg of 70 to 120 ° C. of a polymer obtained by polymerizing the polymer alone is used. An emulsion polymerization step may be included. Examples of the monomer component (s) include the same as the monomer component (b).

[Monomer component (c)]
Between the step of polymerizing the monomer component (a) to produce a rubber polymer (A ') and the step of polymerizing the monomer component (b) in the presence of the rubber polymer (A') May include a step of emulsion-polymerizing the monomer component (c).
As the monomer component (c), 9.9 to 90% by mass of an alkyl acrylate, 0 to 90% by mass of an alkyl methacrylate, 0 to 20% by mass of another monofunctional monomer, and a polyfunctional monomer Mixtures containing from 0.1 to 10% by weight of the body.

As the other monofunctional monomer and polyfunctional monomer used here, the above-described monofunctional monomer (a3) and polyfunctional monomer (a4) can be used.
The step of emulsion-polymerizing the monomer component (c) can be performed in two or more stages. When polymerizing in two or more stages, the composition of the monomer component (c) may be the same or different. Further, the monomer component (c) may contain a surfactant, and may be further mixed and stirred with water and supplied as an emulsion into the polymerization vessel.

[Polymerization method of rubber-containing polymer (A)]
Examples of the method for producing the rubber-containing polymer (A) include a sequential multistage emulsion polymerization method. As a method of performing polymerization in three stages, a monomer component (a) for obtaining a rubbery polymer (A ′), water and a surfactant are mixed and supplied into a polymerization vessel in a state of an emulsion. After the polymerization, the monomer component (c) is supplied into the polymerization container to perform polymerization, and the monomer component (b), water and a surfactant are mixed to form an emulsion, and the mixture is placed in the polymerization container. A method of supplying and polymerizing may be mentioned. In addition, the step of supplying the monomer component (c) into the polymerization vessel and performing polymerization is a step performed as necessary.

  The polymer product obtained by using the rubber-containing polymer (A) produced by the above method has an advantage that the coarse particles in the finally obtained polymer latex are small. In particular, a film is preferable because it has few fish eyes.

Examples of the surfactant used in the production by the sequential multistage emulsion polymerization method include anionic, cationic, and nonionic surfactants. These may be used alone or in combination of two or more. Examples of the anionic surfactant include carboxylate salts such as rosin soap, potassium oleate, sodium stearate, sodium myristate, sodium N-lauroyl sarcosinate, dipotassium alkenyl succinate; and sodium lauryl sulfate. Sulfuric acid ester salts; sulfonates such as sodium dioctylsulfosuccinate, sodium dodecylbenzenesulfonate, sodium alkyldiphenylether disulfonate; and phosphorus such as sodium polyoxyethylene alkylphenyl ether phosphate and sodium polyoxyethylene alkyl ether phosphate Acid ester salts.
Examples of these commercial products include Eleminol NC-718 manufactured by Sanyo Chemical Industry Co., Ltd .; Phosphanol LO-529, Phosphanol RS-610NA, and Phosphanol RS-620NA manufactured by Toho Chemical Industry Co., Ltd. And Phosphanol RS-630NA, Phosphanol RS-640NA, Phosphanol RS-650NA and Phosphanol RS-660NA; and Latemul P-0404, Latemul P-0405, Latemul P-0406 manufactured by Kao Corporation. And Latemul P-0407.

Examples of a method for preparing an emulsion by mixing a monomer component, water and a surfactant include the following methods (1) to (3).
(1) A method of charging a surfactant after charging a monomer component in water, (2) A method of charging a monomer component after charging a surfactant in water, and (3) a monomer A method in which water is added after a surfactant is charged into the components.

  As a mixing device for preparing an emulsion by mixing a monomer component with water and a surfactant, for example, a stirrer equipped with a stirring blade; a forced emulsification device such as a homogenizer and a homomixer; No.

  As the emulsion, any of a W / O type dispersion in which water droplets are dispersed in oil of a monomer component and an O / W type dispersion in which oil droplets of a monomer component are dispersed in water can be used. . It is preferably an O / W type, and the diameter of the oil droplets in the dispersed phase is preferably 100 μm or less, more preferably 50 μm or less, and even more preferably 15 μm or less.

  The amount of the surfactant used for preparing the emulsion is preferably 0.5 to 1.6 parts by mass when the total amount of the monomer components in all the stages of the polymerization is 100 parts by mass. In adjusting the particle size of the sequential multistage polymer, the particle size is usually adjusted by the amount of the first-stage surfactant used. However, in the present invention, separately from the surfactant to be added to the monomer component, by adding the surfactant to water (aqueous medium) charged in advance in the polymerization vessel, a small amount of the surfactant can be used. In addition, the particle diameter of the rubber-containing polymer can be reduced.

  Known polymerization initiators and chain transfer agents are used when polymerizing the monomer component (a) and the monomer component (b), or further when polymerizing the monomer component (c). Can be used. Examples of the method of adding the polymerization initiator and the chain transfer agent include a method of adding the polymerization initiator to the aqueous phase and the monomer phase, and a method of adding the polymerization initiator and the chain transfer agent to both phases.

Examples of the polymerization initiator include a peroxide, an azo-based initiator, and a redox-based initiator.
The redox initiator is an initiator in which a peroxide is combined with an oxidizing agent or a reducing agent, and an initiator in which an azo initiator is combined with an oxidizing agent or a reducing agent. Specific examples include a sulfoxylate initiator obtained by combining ferrous sulfate, disodium ethylenediaminetetraacetate, sodium formaldehyde sulfoxylate, and hydroperoxide.

  Examples of the chain transfer agent include alkyl mercaptans having 2 to 20 carbon atoms, mercapto acids, thiophenol, and carbon tetrachloride. These may be used alone or in combination of two or more. An example is n-octyl mercaptan.

As a method for producing a latex of the rubber-containing polymer (A), a monomer component (a), water and a surfactant are mixed and supplied into a reactor in the form of an emulsion to carry out polymerization. A method in which the body component (c) is fed into the reactor for polymerization, and then the monomer component (b), water and a surfactant are mixed and fed into the reactor in the form of an emulsion to carry out polymerization. And a method for producing the same.
In this case, after raising the aqueous solution in the reactor containing ferrous sulfate, disodium ethylenediaminetetraacetate and sodium formaldehyde sulfoxylate dihydrate to the polymerization temperature, the monomer component (a), water And an emulsion mixed with a surfactant is fed into the reactor and polymerized, then the monomer component (c) is fed into the reactor and polymerized, and further the monomer component (b), water and A method in which an emulsion mixed with a surfactant is supplied into a reactor to perform polymerization.

  The polymerization temperature for obtaining the latex of the rubber-containing polymer (A) varies depending on the type and amount of the polymerization initiator used, but is preferably, for example, about 40 to 120 ° C. The latex of the rubber-containing polymer (A) obtained by the above method can be treated using a filtration device provided with a filter medium, if necessary.

  The latex of the rubber-containing polymer (A) thus obtained can be used for various applications in a latex state. In addition, the rubber-containing polymer (A) is recovered from the latex by a known method such as a salting out coagulation method, an acid precipitation coagulation method, a freeze coagulation method, and a spray drying method, and dried to obtain a rubber-containing polymer. It can be used as the powder of (A). Further, the powder can be melt-extruded and pelletized for use.

  When the rubber-containing polymer (A) is recovered by a coagulation method by a salting-out treatment using a metal salt, the residual metal content in the finally obtained rubber-containing polymer (A) should be 800 ppm or less. It is preferable that the residual metal content is as small as possible.

  The gel fraction of the acrylic resin in the present invention is preferably from 20% to less than 80%, more preferably from 25% to less than 75%, further preferably from 30% to less than 70%. When the gel fraction is 20% or more, workability and anti-fogging property can be imparted, and when it is less than 80%, heat resistance can be maintained and excessive bleed out can be suppressed.

  The gel fraction of the acrylic resin in the present invention can be adjusted by adjusting the amount of the rubber polymer (A ′) in the rubber-containing polymer (A) at the time of polymerization or by blending with a commercially available acrylic resin after the polymerization. Good.

<Polyalkyl glycol copolymer (B)>
The polyalkyl glycol copolymer (B) in the present invention has a role of imparting antifog properties to the acrylic resin.

The polyalkyl glycol copolymer (B) of the present invention also includes those having a molecular weight of tens of thousands or more, which are generally called polyalkyl oxide copolymers.
Structural units constituting the polyalkyl glycol copolymer in the present invention include ethylene glycol, propylene glycol, butylene glycol, cyclohexene glycol, styrene glycol, allyl glycidyl ether and the like. Among them, from the viewpoint of imparting hydrophilicity, the polyalkyl glycol copolymer (B) preferably contains an ethylene glycol unit. Further, in order to prevent bleed-out, it is preferable to contain a glycol unit containing more carbon atoms than an ethylene glycol unit. For example, the polyalkyl glycol copolymer (B) preferably contains a polyethylene glycol unit and a polypropylene glycol unit.
Specific examples of the polyalkyl glycol copolymer (B) containing a polyethylene glycol unit and a polypropylene glycol unit include a polyethylene glycol-polypropylene glycol copolymer or a polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer. Is mentioned.

The weight average molecular weight of the polyalkyl glycol copolymer (B) in the invention is preferably from 50,000 to less than 5,000,000, preferably from 10,000 to 4,000,000, more preferably from 10,000 to 3,000,000. . When the molecular weight of the polyalkyl glycol copolymer is at least 50,000, the film will not be sticky due to excessive bleed-out. On the other hand, when the content is 5,000,000 or less, it is possible to prevent the strength from being reduced due to poor dispersion, stickiness, or insufficient anti-fogging property.
Here, the weight average molecular weight is measured by GPC after dilution with chloroform.

Specific examples of the commercially available polyalkyl glycol copolymer (B) include Alcox manufactured by Meisei Chemical Industry Co., Ltd., and Pluronic manufactured by ADEKA CORPORATION.
As the polyalkyl glycol copolymer (B), one type may be used alone, or two or more types may be used in combination.

  In the present invention, the content of the ethylene glycol unit is preferably from 60% by mass to less than 95% by mass, more preferably from 70% by mass to less than 93% by mass, and still more preferably from 85% by mass to less than 90% by mass. When the content of the ethylene glycol unit is 60% by mass or more, the antifogging property is sufficiently exhibited. On the other hand, when the content of the ethylene glycol unit is less than 95% by mass, stickiness due to bleed out and a decrease in antifogging property are suppressed.

<Anti-fog film>
The anti-fog film of the present invention (hereinafter may be referred to as “the present film”) is a film obtained by using the above-mentioned resin composition.

  The thickness of the film is preferably 2 μm or more and less than 200 μm. The lower limit is preferably 3 μm or more, more preferably 5 μm or more. The upper limit is more preferably less than 180 μm, and further preferably less than 150 μm. When the antifogging layer has a thickness of 2 μm or more, the film has good antifogging properties. On the other hand, when it is less than 200 μm, the workability becomes good, and when it is used as a multilayer body described later, it can have excellent heat resistance when laminated with the base material layer.

  The light transmittance of this film at a wavelength of 555 nm is preferably 85% or more, more preferably 87% or more, and even more preferably 90% or more. When the light transmittance is 85% or more, the visibility of the base is maintained when used as a surface protection material such as a signboard or a building material.

  The film can be produced by a general molding method, for example, extrusion molding, injection molding, blow molding, vacuum molding, air pressure molding, press molding and the like. From the viewpoint of productivity and thickness control, extrusion molding, in particular, T-die method is preferred. Hereinafter, a specific manufacturing method will be described, but the present invention is not limited to this manufacturing method alone.

  This film is produced by melt-extruding a resin composition containing an acrylic resin and a polyalkyl glycol copolymer (B), and then forming the resulting melt-extruded product into a film. Examples of the melt extrusion method include a T-die method and an inflation method. Of these, the T-die method is preferable from the viewpoint of economy. The melt extrusion temperature is preferably about 200 to 240 ° C. In addition, examples of the extruder include a single screw extruder and a twin screw extruder.

  When a film is formed by sandwiching a molten extrudate between a plurality of cooling rolls, the surface of at least one cooling roll is embossed, matted, or the like to form a film on one or both sides. These shapes can be transferred.

<Multilayer body>
The multilayer body of the present invention (hereinafter sometimes referred to as “the present multilayer body”) is a multilayer body provided with at least one anti-fogging film of the present invention described above. It may be a multilayer body having only one layer of the present film, or may be a multilayer body consisting of only the present film. A base layer other than the present film may be provided on the present film. The substrate layer other than the present film is not particularly limited, but is preferably a thermoplastic resin from the viewpoint of moldability.Examples of the thermoplastic resin include olefin resins, ester resins, amide resins, carbonate resins, and acrylic resins. No. Among these, a multilayer body having a layer containing another acrylic resin (not the acrylic resin of the present invention) as the base material layer is preferable from the viewpoint of adhesion to the antifogging layer and film forming properties.

  In the thermoplastic resin serving as the base material, a heat stabilizer, an antioxidant, a matting agent, an ultraviolet absorber, a light stabilizer, an antibacterial / antifungal agent, an antistatic agent, as long as the effects of the present invention are not impaired. Various additives such as lubricants, pigments and dyes may be included.

When the multilayer body is formed by sandwiching the molten extrudate with a plurality of cooling rolls, the surface of at least one cooling roll is embossed, matted, or the like to form a film. These shapes can be transferred to one or both sides.
Above all, when the following hydroxyl group-containing polymer is contained in an acrylic resin, unevenness is exhibited on the surface of the film without imparting an embossed shape, so that blocking when the films are stacked can be suppressed. Further, when the uneven surface of the acrylic resin as the base material is bonded to the molded body by thermal lamination or the like, the lamination can be performed without damaging the design of the molded body.

<Hydroxyl-containing polymer>
The hydroxyl group-containing polymer is composed of 5 to 50% by mass of a hydroxyalkyl (meth) acrylate having a hydroxyl group-containing alkyl group having 1 to 8 carbon atoms, 30 to 90% by mass of an alkyl methacrylate having an alkyl group having 1 to 13 carbon atoms, and carbon number. It is a polymer obtained by copolymerizing a monomer component containing 0.5 to 40% by mass of an alkyl acrylate having 1 to 8 alkyl groups.

  Examples of the hydroxyalkyl (meth) acrylate having a hydroxyl group-containing alkyl group having 1 to 8 carbon atoms include 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2,3-dihydroxypropyl methacrylate, 2-hydroxyethyl acrylate, and 4-hydroxybutyl acrylate. These may be used alone or in combination of two or more. Above all, 2-hydroxyethyl methacrylate is preferred in terms of unevenness-generating properties.

  The lower limit of the content of the hydroxyalkyl (meth) acrylate having a hydroxyl group-containing alkyl group having 1 to 8 carbon atoms in 100% by mass of the monomer component is 5% from the viewpoint that the obtained film has good blocking resistance. %, More preferably 10% by mass or more, even more preferably 20% by mass or more. On the other hand, the upper limit of the content is preferably 50% by mass or less, more preferably 40% by mass or less, from the viewpoint that the dispersibility of the hydroxyl group-containing polymer in the acrylic resin becomes good and the film forming property becomes good.

  Examples of the alkyl methacrylate having an alkyl group having 1 to 13 carbon atoms include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, i-propyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, and t-butyl methacrylate. . These may be used alone or in combination of two or more. Above all, methyl methacrylate is preferred from the viewpoint of weather resistance.

  The lower limit of the content of the alkyl methacrylate having an alkyl group having 1 to 13 carbon atoms in 100% by mass of the monomer component is preferably 30% by mass or more and more preferably 50% by mass or more from the viewpoint of weather resistance. On the other hand, the upper limit of the content is preferably 90% by mass or less, and more preferably 80% by mass or less from the viewpoint of developing unevenness.

  Examples of the alkyl acrylate having an alkyl group having 1 to 8 carbon atoms include methyl acrylate, ethyl acrylate, n-propyl acrylate, i-propyl acrylate, n-butyl acrylate, i-butyl acrylate, t-butyl acrylate and 2-alkyl acrylate. Ethylhexyl acrylate is mentioned. These may be used alone or in combination of two or more.

  The lower limit of the content of the alkyl acrylate having an alkyl group having 1 to 8 carbon atoms in 100% by mass of the monomer component is 0.5% by mass or more in view of the dispersibility of the hydroxyl group-containing polymer in the acrylic resin. , And more preferably 5% by mass or more. On the other hand, the upper limit of the content is preferably 40% by mass or less and more preferably 25% by mass or less from the viewpoint of weather resistance and heat resistance.

The glass transition temperature (Tg) of the hydroxyl group-containing polymer is preferably 90 ° C. or lower, more preferably 80 ° C. or lower, from the viewpoint of dispersibility in the acrylic resin.
The Tg of the hydroxyl group-containing polymer is determined by using the value of the Tg of the homopolymer of each monomer component (as described in the Polymer Handbook [Polymer Handbook, J. Brandrup, Interscience, 1989]). Is calculated from the following equation.

The upper limit of the intrinsic viscosity of the hydroxyl group-containing polymer is preferably 0.3 L / g or less, from the viewpoint of improving the dispersibility of the hydroxyl group-containing polymer in the acrylic resin and improving the appearance of the obtained film. / G or less is more preferable. On the other hand, the lower limit of the intrinsic viscosity is preferably 0.01 L / g or more from the viewpoint of improving the unevenness-producing property of the obtained film.
In addition, the intrinsic viscosity of the hydroxyl group-containing polymer is a value measured at 25 ° C. using chloroform as a solvent using an AVL-2C automatic viscometer manufactured by Sun Electronics Industry.

The weight average molecular weight (Mw) of the hydroxyl group-containing polymer is preferably 30,000 to 200,000, more preferably 50,000 to 200,000. If the Mw of the hydroxyl group-containing polymer is 30,000 or more, the dispersibility in the acrylic resin is good, and if it is 200,000 or less, fine irregularities can be exhibited.
Further, Mw / Mn, which is the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the hydroxyl group-containing polymer, is preferably 2.2 or less. As the Mw / Mn is smaller, the molecular weight distribution of the hydroxyl group-containing polymer becomes closer to monodisperse, so that the high molecular weight component is reduced and the generation of unmelted material which causes poor appearance of the film is suppressed. Generally, it is preferable that Mw / Mn is 1.0 or more.
In addition, Mw and Mw / Mn indicate values obtained by measurement under the following conditions by gel permeation chromatography (GPC).
[GPC measurement conditions]
Equipment used: HLC-8320GPC system (Tosoh Corporation)
Column: 2 TGKgel SuperHZM-H (manufactured by Tosoh Corporation) Lysate: Tetrahydrofuran Column temperature: 40 ° C
Detector: Differential refractive index (RI)

(Production method of hydroxyl group-containing polymer)
As a method for producing a hydroxyl group-containing polymer, suspension polymerization and emulsion polymerization are generally mentioned. Although the production method is not particularly limited, suspension polymerization is described in the present invention.

In the case of suspension polymerization, polymerization is preferably performed by adding an initiator and a suspension stabilizer.
Examples of the initiator used for the suspension polymerization include known organic peroxides and azo compounds. Examples of the suspension stabilizer include known organic colloidal polymer substances, inorganic colloidal polymer substances, inorganic fine particles, and combinations of these with surfactants. When using an inorganic suspension stabilizer, in order to suppress the occurrence of fish eyes in the resulting anti-fog film and not to deteriorate the appearance, the obtained hydroxy group-containing polymer peas-like product is washed with water. Thus, it is preferable to reduce the content of the inorganic suspension stabilizer in the hydroxyl group-containing polymer.

  The hydroxyl group-containing polymer preferably contains no cullet having a particle size of 300 μm or more, more preferably contains no cullet having a particle size of 200 μm or more, and does not contain cullet having a particle size of 100 μm or more. It is more preferable to do so. The cullet refers to a lump formed by a polymer adhering to a portion that comes into contact with latex such as an inner wall surface of a polymerization tank during polymerization.

In order to remove the cullet efficiently by means of separation, and to efficiently remove inorganic substances by washing with water, the upper limit of the average particle diameter of the hydroxyl group-containing polymer is preferably 300 μm or less, more preferably 200 μm or less, and 100 μm or less. The following are more preferred. On the other hand, the lower limit of the average particle diameter is preferably 10 μm or more from the viewpoint of the handleability of the polymer.
The average particle size of the hydroxyl group-containing polymer can be measured using a laser diffraction scattering type particle size distribution analyzer LA-910 manufactured by HORIBA.

  The multilayer body can be formed by a known method, for example, a coextrusion method, a dry lamination method, an extrusion lamination method, a hot melt lamination method, or the like. Above all, it is preferable to form a film by a co-extrusion method from the viewpoint of economy.

  Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to the following Examples as long as the gist of the present invention is not exceeded. Further, “parts” represents “parts by mass”, and “%” represents “% by mass”.

<Acrylic resin>
(Mass average particle diameter of rubber-containing polymer)
About the latex of the rubber-containing polymer obtained by the emulsion polymerization method, the mass average particle diameter was determined by a dynamic light scattering method using a light scattering photometer (DLS-700, manufactured by Otsuka Electronics Co., Ltd.).

(Gel fraction of acrylic resin)
A predetermined amount (mass before extraction) of an acrylic resin was subjected to an extraction treatment in an acetone solvent under reflux, the treated liquid was separated by centrifugation, the acetone-insoluble matter was dried, and the mass was measured (mass after extraction). The gel fraction was calculated by the following equation.
Gel fraction (%) = mass after extraction (g) / mass before extraction (g) × 100.

(Abbreviation)
MMA: methyl methacrylate,
n-BA: n-butyl acrylate,
HEMA: 2-hydroxyethyl methacrylate MA: Methyl acrylate St: Styrene 1,3-BD: 1,3-butylene glycol dimethacrylate,
AMA: allyl methacrylate,
CHP: cumene hydroperoxide,
t-BH: t-butyl hydroperoxide,
LPO: lauryl peroxide n-OM: n-octyl mercaptan,
EDTA: disodium ethylenediaminetetraacetate,
SFS: sodium formaldehyde sulfoxylate (Rongalit),
RS610NA: sodium polyoxyethylene alkyl ether phosphate (Phosphanol RS610NA, manufactured by Toho Chemical Industry Co., Ltd.)
OTP: sodium di-2-ethylhexylsulfosuccinate (Relex OT-P (product name), manufactured by Kao Corporation)

(Production of rubber-containing polymer (A1-1))
A container equipped with a stirrer and a cooler was charged with 8.5 parts of ion-exchanged water, and further 0.3 parts of MMA, 4.5 parts of n-BA, 0.2 parts of 1,3-BD and A monomer component (m11-1) composed of 0.05 part of AMA and 0.025 part of CHP as a polymerization initiator were charged and mixed with stirring. 1.1 parts of RS610NA as an emulsifier was charged into the container with stirring, and stirring was continued for 20 minutes to prepare an emulsion containing the monomer component (m11-1).

186.5 parts of ion-exchanged water was charged into a reaction vessel equipped with a cooler, and the temperature was raised to 70 ° C. A mixture prepared by adding 0.20 part of SFS, 0.0001 part of ferrous sulfate, and 0.0003 part of EDTA to 5 parts of ion-exchanged water was charged all at once into a reaction vessel. While stirring under nitrogen, an emulsion containing the monomer component (m11-1) was dropped into the reaction vessel over 8 minutes. The reaction was continued for 15 minutes to obtain a polymer obtained from the monomer component (m11-1).
Subsequently, a monomer component (m11-2) consisting of 1.5 parts of MMA, 22.5 parts of n-BA, 1.0 part of 1,3-BD and 0.25 part of AMA was added to the reaction vessel, and 0.016 parts of CHP as a polymerization initiator was added over 90 minutes. By continuing the reaction for 60 minutes, a rubber polymer (Aa-1) was obtained as an intermediate polymer. Tg of the rubber polymer (Aa-1) was -47 ° C.

  Subsequently, the rubber polymer (Aa-1) was charged into a reaction vessel in a monomer component (m13-1) consisting of 6.0 parts of MMA, 4.0 parts of n-BA and 0.08 parts of AMA, In addition, 0.013 parts of CHP as a polymerization initiator was added dropwise over 45 minutes. The reaction was continued for 60 minutes to obtain an intermediate polymer. The Tg of the polymer composed of only the monomer component (m13-1) was 20 ° C.

  Subsequently, a monomer component (m12-1) composed of 55.2 parts of MMA and 4.8 parts of n-BA, 0.22 part of n-OM as a chain transfer agent, and polymerization initiation were placed in a reaction vessel. 0.08 parts of t-BH as an agent was added dropwise over 140 minutes. The reaction was continued for 60 minutes to obtain a latex containing the rubber-containing polymer (A1-1). The Tg of the polymer composed of only the monomer component (m12-1) was 84 ° C. The mass average particle diameter of the rubber-containing polymer (A1-1) in the latex was 0.12 μm.

  The latex containing the rubber-containing polymer (A1-1) was filtered using a vibrating filter equipped with a stainless steel mesh (average opening: 54 μm) as a filter medium. The filtrate was poured into an aqueous solution containing 3 parts of calcium acetate to salt out the polymer. The polymer was washed with water, collected, and dried to obtain a powdery rubber-containing polymer (A1-1). The gel fraction of the rubber-containing polymer (A1-1) was 58%.

(Production of rubber-containing polymer (A1-3))
Under a nitrogen atmosphere, 206 parts of deionized water was placed in a reaction vessel equipped with a reflux condenser, and the temperature was raised to 80 ° C. The following component (i) was added, and 1/10 of the following raw material (ii) was charged while stirring and held for 15 minutes. Next, the remaining raw material (ii) was continuously added so that the increase rate of the monomer mixture with respect to water was 8% by mass / hour. Thereafter, the polymerization was carried out for 1 hour to obtain a polymer latex. Subsequently, 0.2 parts of sodium formaldehyde sulfoxylate was added to the polymer latex. Thereafter, the mixture was kept for 15 minutes, and while stirring at 80 ° C. under a nitrogen atmosphere, the following raw material (iii) was continuously added so that the increase rate of the monomer mixture with respect to water was 4% by mass / hour. . Thereafter, the polymerization was carried out for 2 hours to obtain a latex of the elastic copolymer (a1-3-1).
0.2 parts by mass of sodium formaldehyde sulfoxylate was added to the latex of this elastic copolymer (a1-3-1). Then, the mixture was held for 15 minutes, and while stirring at 80 ° C. under a nitrogen atmosphere, the following raw material (iv) was continuously added so that the increasing rate of the monomer mixture with respect to water was 10% by mass / hour. . Thereafter, the polymerization was carried out for 1 hour to obtain a latex of the rubber-containing polymer (A1-3). The average particle diameter of the rubber-containing polymer (A1-3) was 0.28 μm.
The rubber-containing polymer (A1-3) latex was filtered with a filter having a mesh size of 50 μm. Subsequently, coagulation, aggregation, and solidification reactions were performed using calcium acetate, followed by filtration, washing with water, and drying to obtain acrylic rubber particles (A1-3-1).
(I)
SFS 0.4 part Ferrous sulfate 0.00004 part EDTA 0.00012 part (ii)
MMA 11.25 parts BA 12.5 parts St 1.25 parts AMA 0.094 parts 1,3-BD 0.75 parts t-BH 0.044 parts RS-610NA 0.75 parts (iii)
BA 30.9 parts St 6.6 parts AMA 0.66 parts 1,3-BD 0.09 parts CHP 0.11 parts RS-610NA 0.6 parts (iv)
MMA 35.6 parts MA 1.9 parts n-OM 0.11 parts t-BH 0.06 parts

(Production of hydroxyl group-containing polymer (C-1))
The following monomer mixture (1) was charged into a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen gas inlet, and the like. Next, after sufficiently replacing the inside of the vessel with nitrogen gas, the monomer mixture (1) in the reaction vessel was heated to 75 ° C. with stirring, and reacted in a nitrogen gas stream for 3 hours. Thereafter, the temperature in the reaction vessel was raised to 90 ° C., and further maintained for 45 minutes to complete the polymerization. The polymerization was completed with openings of 100 μm, and the passed beads were dehydrated and dried to obtain a hydroxyl group-containing polymer. (C-1) was obtained.
The Tg of the obtained hydroxyl group-containing polymer (C-1) was 77 ° C., the intrinsic viscosity was 0.06 L / g, Mw / Mn was 2.1, and the average particle diameter was 70 μm.
<Monomer mixture (1)>
MA: 10 parts MMA: 60 parts HEMA: 30 parts n-OM: 0.18 parts LPO: 1 part Calcium tribasic phosphate: 1.8 parts Deionized water: 250 parts

(Example 1)
90% by mass of a rubber-containing polymer (A1-1) and polyethylene glycol-polypropylene glycol-polyethylene glycol copolymer (PEG-PPO-PEG) (B-1) (manufactured by ADEKA, weight average molecular weight 15,000, PPG20) 10% by mass), dry-blended and biaxially kneaded at 230 ° C, and then press-molded at 200 ° C and 3 MPa for 5 minutes to obtain an antifogging film having a thickness of 100 µm.

(Example 2)
50% by mass of a rubber-containing polymer (A1-1), and 35% by mass of a PMMA resin (A1-2) (manufactured by Mitsubishi Chemical Corporation, MFR = 2.0 g / 10 minutes) as a polymer containing no rubber-containing polymer, PEG-PPG-PEG (B-1) 5 mass% and polyethylene oxide-polypropylene oxide copolymer (PEO-PPO) (B-2) (manufactured by Meisei Chemical Co., Ltd., weight average molecular weight 800,000, PPO 20 mass%) An antifogging film was obtained in the same manner as in Example 1 except that 10% by mass was blended.

(Example 3)
Same as Example 1 except that rubber-containing polymer (A1-1) was blended with 85% by mass, PEG-PPG-PEG (B-1) 10% by mass and PEO-PPO (B-2) 5% by mass. To obtain an antifogging film.

(Example 4)
An antifogging film was obtained in the same manner as in Example 1, except that 90% by mass of the rubber-containing polymer (A1-1) and 10% by mass of PEO-PPO (B-2) were blended.

(Example 5)
90% by mass of rubber-containing polymer (A1-1) and polyethylene oxide-polypropylene oxide copolymer (PEO-PPO) (B-3) (manufactured by Meisei Chemical Co., Ltd., weight average molecular weight 1,000,000, PPO 10% by mass) 10 % By mass, and the same procedure as in Example 1 was carried out to obtain an antifogging film.

(Comparative Example 1)
An antifogging film was obtained in the same manner as in Example 1, except that 100% by mass of the rubber-containing polymer (A1-1) was used.

(Comparative Example 2)
Same as Example 1 except that 90% by mass of the rubber-containing polymer (A1-1) and 10% by mass of polyethylene oxide (PEO) (B-4) (manufactured by Meisei Chemical Co., Ltd., weight average molecular weight: 1,000,000) were blended. An antifogging film was obtained by the method.

(Comparative Example 3)
An antifogging film was obtained in the same manner as in Example 1, except that 90% by mass of PMMA (A1-2) and 10% by mass of PEG-PPG-PEG (B-1) were blended.

(Comparative Example 4)
An antifogging film was obtained in the same manner as in Example 1 except that 80% by mass of the rubber-containing polymer (A1-1) and 20% by mass of PEG-PPG-PEG (B-1) were blended.

(Examples 6 to 8)
As the antifogging layer, a rubber-containing polymer (A1-3), PMMA (A1-2), a processing aid (manufactured by Mitsubishi Chemical Corporation, trade name: Metablen P-530A), PEG-PPG-PEG (B- 1) was mixed using a Henschel mixer at the ratios shown in Table 2. This mixture is melt-kneaded at a cylinder temperature of 100 to 240 ° C. and a die temperature of 240 ° C. using a degassing type extruder (trade name: TEM-35B, manufactured by Toshiba Machine Co., Ltd.) to prevent defogging. A resin pellet to be a layer was obtained. The transmittance at a wavelength of 555 nm of the antifogging layer (antifogging film) obtained by press-molding the obtained resin pellets was 91% for the compositions of Examples 6 and 7, and 90% for the composition of Example 8. Met.
-As a base material layer, 85.8% by mass of a rubber-containing polymer (A1-1), 1.7% by mass of a processing aid Metablen P-530A, and a lubricant (Metablene L-1000, manufactured by Mitsubishi Chemical Corporation) 0 9.9% by mass, 9.4% by mass of a hydroxyl group-containing polymer (C-1), 1.8% by mass of an ultraviolet absorber (trade name: LA-31RG, manufactured by ADEKA Corporation), and a light stabilizer (ADEKA Corporation) (Trade name: LA-57G) and 0.1% by mass of an antioxidant (BASF Japan K.K., trade name: Irganox 1076) using a Henschel mixer. This mixture was melt-kneaded at a cylinder temperature of 100 to 240 ° C. and a die temperature of 240 ° C. using a degassing extruder to obtain resin pellets to be a base material layer.
A multilayer body was produced from the prepared resin pellets using a multi-manifold die installed at the tip of a 40 mmφ single screw extruder 1 and a 30 mmφ single screw extruder 2.
The resin pellets serving as the anti-fog layer are supplied to a single screw extruder 1 having a cylinder temperature of 230 to 240 ° C., and the resin pellets serving as the base material layer are supplied to a single screw extruder 2 having a cylinder temperature of 230 to 240 ° C. Melt plasticized. After supplying each melt plasticized product to a multi-manifold die heated to 250 ° C., the base material layer is cooled so as to be in contact with a cooling port of 80 ° C., so that the thickness of the anti-fog layer is 10 μm, A multilayer body having a layer thickness of 50 μm was obtained.

[Evaluation item]
The obtained antifogging film or multilayer was evaluated as follows. The evaluation results are shown in Tables 1 and 2.

(1) Light transmittance The transmittance at a wavelength of 555 nm was measured according to JIS K7136.

(2) Appearance The obtained film was stored under the conditions of 40 ° C. and 90% RH for one week, and before and after the change, the appearance change of the film was evaluated according to the following criteria.
：: Practical range without stickiness due to whitening and bleeding.
×: Stickiness due to whitening and bleeding is observed.

(3) Antifogging property The obtained film was stored under the conditions of 40 ° C. and 90% RH for one week, and before and after that, the change of the antifogging property of the film was evaluated according to the following criteria. The antifogging property was evaluated based on the state of water droplets after spraying five times on a film inclined at an angle of 45 degrees.
：: Water flows without water droplets Δ: Water flows immediately but a few water droplets remain. However, it is within a practical range.
×: Water does not flow and water drops remain

(4) Blocking of the multilayer body Ten multilayer bodies were superimposed so that the antifogging layer and the base material layer were in contact with each other, and evaluated according to the following criteria.
：: good adhesion with no sticking between the multilayer bodies.
Δ: There is slight sticking between the multilayer bodies, and resistance is felt when peeling.
X: The sticking of the multilayer bodies is remarkable, and the multilayer bodies are hard to peel off.

From Table 1, the antifogging films of Examples 1 to 5 have excellent transparency, do not cause stickiness due to whitening and bleeding, and have excellent antifogging properties from the initial stage to after storage under high temperature and high humidity. You can see that. Further, the multilayer bodies of Examples 6 to 8 are excellent in transparency and anti-fogging property, and furthermore, the blocking of the multilayer body is suppressed, so that the appearance when the multilayer body is formed into a roll is also improved.
On the other hand, Comparative Example 1 lacks the polyalkylglycol copolymer (B), and thus has insufficient antifogging properties.
In Comparative Example 2, since the polyalkyl glycol copolymer (B) was not used, the bleed out over time could not be controlled, and problems such as stickiness of the antifogging film surface occurred.
Comparative Example 3 does not use an acrylic resin containing a rubber-containing polymer, and thus lacks anti-fogging properties.
In Comparative Example 4, since the blending amount of the polyalkyl oxide copolymer was 20% by weight, stickiness due to bleed-out occurred.

  The anti-fogging film and the multilayer body of the present invention are excellent in transparency and anti-fogging property, and can maintain the anti-fogging property even under high humidity, so that they are suitably used for outdoor applications such as signboards and building materials. be able to.

Claims (10)

  A resin composition containing an acrylic resin containing a rubber-containing polymer (A) and a polyalkyl glycol copolymer (B), and containing the polyalkyl glycol copolymer (B) in an amount of 1% by mass or more and less than 20% by mass.   The resin composition according to claim 1, wherein the polyalkyl glycol copolymer (B) contains a polyethylene glycol unit and a polypropylene glycol unit.   The resin composition according to claim 1, wherein the polyalkyl glycol copolymer (B) is a polyethylene glycol-polypropylene glycol copolymer.   The resin composition according to claim 1 or 2, wherein the polyalkyl glycol copolymer (B) is a triblock copolymer of polyethylene glycol-polypropylene glycol-polyethylene glycol.   The resin composition according to any one of claims 1 to 4, wherein a gel fraction of the acrylic resin is 20% or more and less than 80%.   An antifogging film using the resin composition according to claim 1.   The antifogging film according to claim 6, wherein the light transmittance at a wavelength of 555 nm is 85% or more.   A multilayer body comprising at least one antifogging film according to claim 6 or 7 as an antifogging layer.   The multilayer body according to claim 8, further comprising a layer containing another acrylic resin as the base layer.   The method for producing a multilayer body according to claim 8, wherein the film is formed by a co-extrusion method.