JPS63278840A - Anti-fogging sheet - Google Patents

Abstract

PURPOSE:To extend the life of the title sheet, by forming an anti-fogging layer from a composition obtained by crosslinking a polymer and a hydrophylic monomer by irradiation with electron beam. CONSTITUTION:An anti-fogging sheet has a support film and an anti-fogging layer, and the anti-fogging layer is formed from a composition obtained by crosslinking a polymer and a hydrophylic monomer by irradiating both of them with electron beam. In forming the anti-fogging layer, 5-200pts.wt. of the hydrophylic monomer is added to 100pts.wt. of the polymer. When the amount of the hydrophylic monomer is below 5pts.wt., no sufficient hydrophylicity is imparted and, contrarily, when said amount exceeds 200pts.wt., the water resistance of the film is lowered. The pref. content of the hydrophylic monomer is 20-150pts.wt. A crosslinkable monomer is 1-300pts.wt. of 100pts. of the polymer and a hydrophylic crosslinkable monomer is 1-200pts.wt. of 100pts.wt. of the polymer.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to an anti-fog sheet for imparting anti-fog properties to the surfaces of articles such as automobile windows and side mirrors, household mirrors and bathroom windows. .

[Conventional technology 1] Conventionally, as an antifogging layer that imparts antifogging properties to the surface of an article, (a) a layer that achieves antifogging properties by kneading a surfactant into a resin, (0) a colloidal silica or phosphor There are those whose antifogging life has been extended by adding Im-free salts such as phite, and those whose surface has been made hydrophilic by (c) polymer modification such as saponification of acetyl cellulose.

[Problems to be Solved by the Invention] However, the above-mentioned antifogging layer (a) has a problem in that its antifogging life is short due to leaching of the surfactant. Furthermore, the above-mentioned antifogging layer (b) has a problem in that its antifogging life is short due to leaching of the surfactant. Furthermore, the anti-fog layer (c) has a problem of poor film strength when wet and is damaged during application, resulting in deterioration of anti-fog properties.

In view of the above problems, an object of the present invention is to provide an antifogging sheet that solves the problems of the prior art described above.

Means for Solving Problem L] In view of the above objectives, as a result of intensive research, we have achieved good and durable anti-fog properties by cross-linking the anti-fog layer of the anti-fog sheet by electron beam irradiation. The present inventors have discovered that it is possible to provide the same, and have come up with the present invention. .

That is, the antifogging sheet of the present invention has a support film and an antifogging layer, and the antifogging layer is characterized in that a polymer, a hydrophilic monomer, etc. are crosslinked by electron beam irradiation.

The anti-fog sheet of the present invention is most simply formed by forming an anti-fog layer on a support film, but if necessary, a contact layer may be formed on the back surface of the support film, or a layer formed between the support film and the anti-fog layer may be formed. A printed layer may be provided between the two.

Azuma Tsukiji t) Lla The supporting film can be made of various materials depending on the purpose, as long as it has sufficient mechanical strength to support the antifogging layer. Specific examples include films, sheets, and boards made of polyesters such as polyethylene terephthalate, polyolefins such as polyethylene and polypropylene, polyamides such as nylon, and synthetic resins such as polycarbonate, polyacrylate, polystyrene, and polyvinyl chloride. These can be laminated and used if necessary.

The support film may be colored in various colors as required. Disperse dyes are preferred as spring coloring agents.

Disperse dyes such as heptanoazo, bisazo, anthraquinone, nitro, styryl, methine, aroylene, benzimidazole, aminonaphthylamide, naphthoquinoneimide, coumarin derivatives and the like can be used.

Anti-fog layer The anti-fog layer basically consists of a polymer cross-linked with a hydrophilic polymer or the like by irradiation with an electron beam and, if necessary, a surfactant. As for the specific combination.

(B) Polymer 10-philic monomer, (2) Polymer 10-hydrophilic 7-mer 10 surfactant, (3)
(2) Polymer (1) Hydrophilic monomer (1) Cross-linkable monomer (1) Surfactant (5) Polymer (1) Wood-related monomer (1) Cross-linkable monomer (5) Polymer (5) Hydrophilic monomer (1) Cross-linkable (g) a polymer, a hydrophilic monomer, a hydrophilic crosslinking monomer, and (d) a polymer, a hydrophilic monomer, a hydrophilic crosslinking monomer, and a surfactant. In all of the above combinations, the polymer can be either a functional polymer or a boneless polymer.

As the non-functional polymer, polyacrylic acid alkyl ester, polymethacrylic acid alkyl ester, polyurethane, polyester, polyamide, polyvinyl acetate, polyvinyl chloride, polystyrene, polyacrylonitrile, polyvinylgorolidone, etc. can be used.

In order to improve the compatibility with hydrophilic monomers, a hydrophilic group may be introduced into the non-functional polymer in advance.
A copolymer with The ratio of the wood-philic monomer to the non-functional polymer is 50 mol% or less, and if it exceeds this, the water resistance of the resulting membrane will decrease.

Furthermore, derivatives of polyvinyl alcohol such as partially saponified polyvinyl alcohol, polyvinyl butyral °, and polyvinyl acetal, and cellulose derivatives such as nitrocellulose, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, and hydroxypropylcellulose can also be used. can.

On the other hand, a functional polymer is a polymer having a functional group that causes a crosslinking reaction by ionizing radiation, and examples of the functional group include the following.

Acryloyl group -〇〇-C=CI-12CH3 Methacryloyl group -QC-C=CH2 Allyl group -CIl -CI-1=CH2 Epoxy group -CH-Cl-12 The functional group is 1 in the molecular weight of the polymer from 300 to 10,000. It is desirable that the ratio is less than one per 10,000 molecules fi, and there will be almost no crosslinking effect due to the functional group.
If the ratio exceeds one per molecular weight of 300, the crosslinking density will become too high.

Examples of functional polymers include urethane acrylate, polyester acrylate, epoxy acrylate, etc., and acrylic acid chloride or acrylic! ! - Copolymers with acryloyl groups introduced by adding a 1:1 adduct of 2-hydroxyethyl and diisocyanate, and glycidyl methacrylate added to the carboxyl groups of copolymers of acrylic acid alkyl ester and acrylic acid. Acrylic acid chloride or acrylic acid-
A 1:1 adduct of 2-hydroxyethyl° and diisocyanate can be used.

The above-mentioned polymer may be in the form of an oligomer, but from the viewpoint of film-forming properties, the molecular weight is preferably from 1,000 to 300,000 (weight average).

Hydrophilic monomers include hydroxyl groups, carboxyl groups (metal salts),
Amide group, imide group, sulfone group, ammonium base,
A monomer containing a hydrophilic group such as a phosphoric acid group, such as acrylic acid 2-, droxyethyl, methacryl 'f1
12-hydroxyethyl, acrylic i12-hydroxypropyl, methacryl wI2-hydroxypropyl, acrylic acid, methacrylic acid, acrylic acid gold jl salt, methacrylic acid gold 8 salt, acrylamide, methacrylamide, dimethylaminopropylacrylamide, dimethylaminopropylmethacrylamide , N-acryloylmorpholine, N-methacryloylmorpholine, N-methylol acrylamide, N-methylol methacrylamide,
t-Butylacrylamide, t-butylmethacrylamide, N-methoxymethylacrylamide, N-1 toxymethylacrylamide, N-n-butoxyacrylamide, N,N-dimethylacrylamide, N,N-dimethylaminobutyl acrylamide, N , N-dimethylaminopropyl methacrylamide, polyethylene glycol monomethacrylate, polypropylene glycol monomethacrylate, glycerol monomethacrylate, 2
-Acrylamido 2-methylpropanesulfonic acid, methacrylamide butyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, mono(2-methacryloyloxyethyl)
Examples include acid phosphate.

Crosslinkable monomers are monomers that have two or more groups that easily become radicals by electron beam irradiation, such as acryloyl groups, methacryloyl groups, allyl groups, and epoxy groups, and crosslink with both the backbone polymer and the hydrophilic monomer. This improves the overall crosslinking density of the membrane, increases membrane strength, and prevents unreacted hydrophilic monomers from remaining.

Such crosslinking monomers include ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, glycidyl methacrylate, neopentyl glycol dimethacrylate, tetraethylene glycol dimethacrylate, 2,2-bis( 4-(acryloxyjethoxy)
phenyl)propane, 2,2-bis(4-(methacryloxyjethoxy)phenyl)propane, 2,2-bis(
4-(acryloxypolyethoxy)phenyl)propane, 2.2-bis[4-(methacryloxypolyethoxy)
Examples include bifunctional monomers such as phenyl]propane, trifunctional monomers such as trimethylolpropane trimethacrylate, and polyfunctional monomers such as tetramethylolmethanetetraacrylate and dipentaerythritol hexaacrylate.

Hydrophilic crosslinking monomers include hydroxyl group, carboxyl group (metal salt), amide group, imide group, sulfonic acid group (metal salt),
It is a monomer having a hydrophilic group such as an ammonium base or a phosphoric acid group and two or more crosslinkable functional groups that easily become radicals by electron beam irradiation, such as an acryloyl group, a methacryloyl group, an allyl group, or an epoxy group.

Examples of such hydrophilic crosslinking monomers include those having 11 tW of water such as glycerol di(meth)acrylate and glycerol methacrylate acrylate, ethylene glycol, diglycidyl ether di(meth)acrylate, and polyethylene glycol diglycidyl ether di( meth)acrylate, polypropylene glycol diglycidyl ether di(meth)acrylate,
Neopentyl glycol diglycidyl ether di(meth)acrylate, glycerin diglycidyl ether di(meth)acrylate, Pisf I-NorA diglycidyl ether di(meth)acrylate, trimethylolpropane triglycidyl ether di(meth)acrylate, etc. 1 of diol diglycidyl ether and acrylic acid
:2 adduct, pentaerythritol mono(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol mono(meth)acrylate, dipentaerythritol di(meth)acrylate, dipentaerythritol Tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, pentaerythritol derivatives such as dipentaerythritol penta(meth)acrylate, methylene bis(meth)acrylamide, acrylamide/glyoxal adduct, acrylamide/methylene urea condensate , 1,3.5-triacryloylhexahydro-s-triazine, N.

N-diallylacrylamide, acrylamide/methylolmelamine condensate, acrylamide/methyloltriazone condensate, acrylamide/methylolhydantoin condensate, acrylamide/medylolurea, N,N-
Examples include acrylamide derivatives such as diallylacrylamide.

The anti-@ layer of the present invention can also contain a surfactant. The surfactant has the effect of imparting antifogging properties by gradually exuding from the hydrophilic film to the surface.

Any anionic, nonionic, or cationic surfactant can be used as long as it has good compatibility with the composition consisting of the above components constituting the antifogging layer.

Examples of anionic surfactants include fatty acid salts, alkyl sulfate ester salts, alkylbenzene sulfonates, alkylnaphthalene sulfone MFA1 dialkyl sulfosuccinate ester salts, alkyl phosphate ester salts, naphthalene sulfonic acid-formalin condensates, polyoxyethylene alkyl [ Nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkylphenol ether, polyoxyethylene fatty acid ester, sorbitan fatty acid ester, polyoxy, diethylene sorbitan fatty acid ester, and polyoxyethylene alkyl. Examples include amines, glycerin fatty acid esters, oxyethylene-oxybrobylene block polymers, etc., and examples of cationic surfactants include alkyl amines, 4@ammonium salts, etc.

When forming the antifogging layer of the present invention, the hydrophilic monomer is added in an amount of 5 to 200 parts by weight per 100 parts by weight of the polymer. 5
If it is less than 200 parts by weight, sufficient hydrophilicity will not be imparted;
If the amount exceeds 1 part by weight, the water resistance of the membrane decreases.

The preferred hydrophilic monomer content is 20 to 150 parts by weight.

The crosslinking monomer is 1 to 30 parts per 100 parts by weight of the polymer.
It is 0 parts by weight. If it is less than 1 part by weight, crosslinking of the unreacted wood-philic monomer will be insufficient, and if it exceeds 300 parts by weight, the crosslinking density of the entire membrane will become too high. Especially when the polymer has no functional groups, the content of crosslinking monomers is 5
It is preferably 300 parts by weight, more preferably 5 to 200 parts by weight. Further, when the polymer has a functional group, the content of the crosslinking monomer is preferably 1 to 2001 parts by weight, more preferably 5 to 100 parts by weight.

Hydrophilic crosslinking monomer per 100 parts by weight of polymer
~200 parts by weight. If the amount is less than 100 parts by weight of the polymer, sufficient hydrophilicity and crosslinking properties will not be imparted, whereas if it exceeds 200 parts by weight, the water resistance of the membrane will decrease and the crosslinking density will become too high. The preferred content of the hydrophilic crosslinkable monomer is 1 to 100 parts by weight.

When a surfactant is added, the amount is 100 parts by weight or less per 100 parts by weight of the polymer. If the suspension exceeds 100 loads, too much surfactant will ooze out. The preferred content is 1 to 50 parts.

When forming an antifogging layer, the composition is made of an appropriate combination of the above components and contains an appropriate solvent. The solvent not only adjusts the fluidity of the composition but also has the effect of lifting the wood-philic monomer onto the surface of the coating film, and is therefore preferred in forming the antifogging layer of the present invention.

Usable solvents include alcohols such as methanol, ethanol, isopropanol, methyl cellosolve, and ethyl cellosolve, ethers such as tetrahydrofuran, ketones such as methyl ethyl ketone, acetone, and methyl imbutyl ketone, ethyl acetate, and acetic acid. Solvents include esters such as butyl, aromatic hydrocarbons such as toluene and xylene, or a mixture thereof.

The amount of solvent added varies depending on the film formation method, but when forming a coating film by coating, the solid content in the composition is 5 to 50% by weight, preferably 5 to 30% by weight. Generally, the amount of solvent added is 6000 parts per 100 parts by weight of polymer.
Part by weight or less.

An antifogging layer can be formed by the following method using a composition consisting of the above components.

First, a composition adjusted to an appropriate viscosity is applied onto the surface of a support film by a roll coating method such as a gravure reverse method, a three-line reverse method, a gravure direct method, or a four-line reverse method. The coating film of the composition formed on the support film is dried while being heated with a dryer or the like in order to remove the solvent by evaporation. If the heating temperature is too high, the monomers will also evaporate, so the maximum heating temperature is about 140°C.

In the antifogging layer formed as described above, the monomer floats to the surface, forming a monomer-rich phase and a polymer-rich phase.
It was found that there is a tendency to consist of a rich phase. This is an important feature of the invention. That is, due to such "orientation", an antifogging layer supported by a polymer skeleton portion having hydrophilic properties and a relatively large number of groups on the surface and having water resistance, mechanical strength, etc. can be obtained.

Next, this antifogging layer is irradiated with an electron beam. As the irradiation method, any method such as an electron curtain method or a beam scanning method can be used. By irradiation with electron beams, polymers with or without functional groups can be crosslinked, and the monomers crosslink to the polymer in the form of graft or block polymerization. This point is markedly different from crosslinking by ultraviolet irradiation. The energy of the emitted electron beam is 1
It is about 50 to 200 keV, and the irradiation amount varies depending on the composition of the composition, the desired degree of crosslinking density, etc. The more functional groups there are in the polymer and the more crosslinkable 7-mers there are, the less the irradiation load will be required, and the higher the crosslinking density, the more the irradiation load will need to be. In particular, when a surfactant is contained, if the crosslinking density is too high, its exudation will be insufficient and the antifogging effect will be reduced, so controlling the irradiation amount is important.

From the above, it is generally assumed that 1) the amount of i is 0.5 to 20M r
ad, and if it is less than 0.5 Mrad, unreacted monomers may remain, and if it exceeds 20 Mrad, the crosslinking density will become too high.

The antifogging layer thus created has a polymer skeleton crosslinked with a hydrophilic monomer and/or a hydrophilic crosslinkable monomer, and a hydrophilic group of the hydrophilic monomer and/or hydrophilic crosslinkable monomer on the layer surface. It has a unique structure of being concentrated. Therefore, it has good antifogging properties. Since the entire upper layer is crosslinked, it has sufficient hardness and strength.

Because of the hydrophilic groups present on the surface, it has excellent antifogging properties, especially in applications where it is exposed to water vapor for a short period of time. Therefore, it is not particularly necessary to contain a surfactant in those used for such purposes.

On the other hand, for those used in applications that are exposed to water vapor for a long period of time, it is necessary to contain a surfactant. In this case, the hydrophilic groups on the surface exhibit initial antifogging properties, and the surfactant present in the layer oozes out to the surface due to moisture adhering to the layer surface, thereby exhibiting long-term antifogging properties. Here, since the antifogging layer of the present invention is crosslinked, the surfactant leaches out gradually, and the antifogging property can be maintained for a very long period of time. Furthermore, by changing the electron beam irradiation conditions, the crosslinking density can be adjusted to control the exudation rate of the surfactant.

The thickness of the anti-fog layer is 0.5 to 30 μm, preferably 1 to 10 μm.
It is μm.

The antifogging layer may also contain various colorants as required. As the coloring agent, the same coloring agent as that for the support film can be used. Furthermore, to improve weather resistance,
An ultraviolet absorber can also be added to the antifogging layer, for example, a benzotriazole-based ultraviolet absorber can be used.

Note that an appropriate adhesive layer may be provided between the antifogging layer and the support film.

deep red! 1. In order to attach the antifogging sheet to glass, mirrors, etc., an adhesive layer can be provided on the back side of the support film.

As the adhesive, known adhesives can be used, such as S[
Any adhesive such as 3R type, natural rubber type, solvent type acrylic resin, emulsion type acrylic resin, butyl rubber type, isobutyl rubber type thermoplastic elastomer type (hot melt), silicone type etc. can be used.

These resins are diluted as necessary to obtain a viscosity suitable for coating, and then subjected to known coating methods such as reverse roll coating, roll coating, gravure coating, kiss coating, plate coating,
Coat using smooth coating, etc.

The thickness of the adhesive layer is generally 10 to 30 μm, preferably 15 to 30 μm. Further, an ultraviolet absorber can be added to the adhesive layer to improve weather resistance.

Minister! 1. The printing layer is for giving a printed pattern to the article by pasting an antifogging sheet. The printing layer is usually provided between the support film and the anti-fog layer, and the type of ink may be determined by taking into account the application and the 4!4 structure of the anti-fog sheet.

Ordinary inks are prepared by mixing pigments or dyes, colorants, plasticizers, stabilizers, other additives, or solvents or diluents in a vehicle.

Among the components of the ink, binders related to adhesion include homopolymers of acrylic or methacrylic monomers such as polymethyl methacrylate, polyethyl methacrylate, polyethyl acrylate, and polybutyl acrylate, or copolymers of these monomers. Preferably, one or more alcohol-insoluble resins are selected and used, such as styrene resins such as copolymers containing polystyrene and polyα-styrene, styrene copolymer resins, cellulose acetate, vinyl chloride, and polyester resins. do.

In addition to the above, the following layers can be provided as appropriate.

A thin metal FA layer may be provided on the surface of the antifogging sheet to give it a metallic appearance. Materials for making the metal thin film layer include aluminum, chromium, tin, silver, copper, and gold, and the thickness is usually about 400 to 600. The metal thin film layer can be patterned if necessary. I This metal thin WA layer is formed by vapor deposition, sputtering, plating, etc.

1. Anti-■1 (a) Dyeing or coating with pigments or dyes, (b)
It is formed by thin coating by vapor deposition or sputtering of aluminum, copper, silver, etc., (c) thin coating by sputtering or coating of ceramic such as aluminum titanate, (d) selective permeability multilayer coating, etc.

In addition, a colored layer may be provided separately, or a protective layer made of polypropylene or polyester may be provided.

[Example] A preferred example of the antifogging sheet of the present invention is shown in FIG. 1 is a support film, and 2 is an anti-fog layer.

FIG. 2 shows another embodiment, 1.2 is the same as FIG. 1,
3 is an adhesive layer. Moreover, FIG. 3 shows yet another embodiment,
1.2.3 are the same as in FIG. 2, and 4 is a printing layer.

FIG. 4 shows yet another embodiment, in which 1,2.degree. 3 is the same as in FIG. 2, 5 is an aluminum vapor deposited layer, and 10 is a release sheet. FIG. 5 shows yet another example, 1, 2. 3, 5
．． 10 is the same as in FIG. 4, and 7 is an adhesive layer. 6th
The figure shows yet another example, and 1.2.3.7, 10 are fifth examples.
It is the same as the figure, and 6 is a heat ray reflective layer and 9 is a protective layer. FIG. 7 shows yet another example, in which 1, 2.3, and 1.0 are the same as in FIG. 4, and 8 is a colored layer.

Next, the present invention will be explained in more detail using specific examples.

Examples 1 to 9 Polyester film (manufactured by Toshi ■,
Using a roll coater, a composition shown in Table 1 below was applied to one side of Lumirror ■-60 (thickness 38 .mu.m) and dried with a drier to form an 8 .mu.m thick antifogging layer. Next, an electron curtain type EB device (
(Manufactured by ESI), the electron beam of 175 eV was applied to 58 rad.
@I irradiated it and hardened it.

Note that the acrylic polymer solution was prepared according to the following procedure. That is, methyl methacrylate 700 raw material and 2
- Hydroxyethyl methacrylate 390 @ hanging part, 1.5 parts of azobisisobutyronitrile and 2210 parts by weight of Methyl Celsolve are placed in a separable flask equipped with a flow tube and a stirrer and purged with nitrogen, The reaction was carried out at 85°C for 5 hours in a N2 stream. Thereafter, 1.5 parts by weight of azobisisobutyronitrile was further added, and the mixture was reacted for 3 hours. The resulting acrylic polymer solution has a concentration of 333 double circles, and the weight average molecular m (Mw) as measured by gel permeation Omography (GPC) is 7.
It was 5 x 10'. Moreover, no monomer peak was observed.

Furthermore, an acrylic pressure-sensitive adhesive layer was applied to the back of the support film so that the dry thickness was 25 μm to obtain an antifogging sheet.

Attach the folded anti-fog sheet to a glass plate with a thickness of 2 shoes.
The following antifogging test was conducted.

(1) Water contact angle test.

(2) Breath test (to check whether cloudiness occurs with exhaled breath). ○: Clouding did not occur; X: *fogging occurred.

(3) Ice water breath test (a film is pasted on a beaker containing ice water and exhaled for 1 minute to check whether clouding occurs), O: no clouding occurs, X: clouding occurs.

(4) 60°C steam test (exposing the film to 60°C salt air to check whether clouding occurs).

O: @zu (1 minute) Δ: Cloudy in 1 minute X: Cloudy immediately The results are shown in Table 2 below.

As shown in Table 2 and above, the articles to which the antifogging sheet of the present invention was attached showed good antifogging properties.

[Effects of the Invention] Since the antifogging sheet of the present invention has the antifogging layer having the above structure, it has good and long-life antifogging properties. Moreover, since it can be easily applied to articles of various shapes, it is convenient for imparting antifogging properties. Therefore, the antifogging sheet of the present invention can be effectively used for automobile windows and mirrors, household mirrors and windows, especially bathroom mirrors.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an anti-fog sheet according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of an anti-fog sheet according to another embodiment of the present invention, and FIG. 3 is a cross-sectional view of an anti-fog sheet according to another embodiment of the present invention. FIG. 7 is a cross-sectional view of an antifogging sheet according to yet another example. FIG. 4 is a cross-sectional view of an anti-fog sheet according to yet another embodiment of the present invention, FIG. 5 is a cross-sectional view of an anti-fog sheet according to yet another embodiment of the present invention, and FIG. FIG. 7 is a cross-sectional view of an anti-fog sheet according to yet another embodiment of the present invention; FIG. 7 is a cross-sectional view of an anti-fog sheet according to yet another embodiment of the present invention. 1... Support sheet 2... Anti-fog layer 3... Adhesive layer 4... Printing layer 5... Aluminum vapor deposited layer 6... Heat ray anti-Il1 Figure 7... Adhesive layer 8... Colored layer 9... Fa retaining layer 10... Release sheet

Claims (14)

[Claims] (1) An anti-fog sheet comprising a support film and an anti-fog layer, wherein the anti-fog layer is a polymer and a hydrophilic monomer crosslinked by electron beam irradiation. (2) In the antifogging sheet according to claim 1, the antifogging layer contains 100 parts by weight of a polymer and 5 to 20 parts by weight of a polymer.
An antifogging sheet characterized by being crosslinked with 0 parts by weight of a hydrophilic monomer using an electron beam. (3) The anti-fog sheet according to claim 2, wherein the anti-fog layer contains 1 to 100 parts by weight of a surfactant. (4) In the antifogging sheet according to claim 1, the antifogging layer contains 100 parts by weight of a polymer and 5 to 20 parts by weight of a polymer.
An antifogging sheet characterized in that 0 parts by weight of a hydrophilic monomer and 1 to 300 parts by weight of a crosslinkable monomer are crosslinked by electron beam. (5) The anti-fog sheet according to claim 4, wherein the anti-fog layer contains 1 to 100 parts by weight of a surfactant. (6) In the antifogging sheet according to claim 1, the antifogging layer contains 100 parts by weight of a polymer and 5 to 20 parts by weight of a polymer.
An antifogging sheet characterized by being crosslinked with 0 parts by weight of a hydrophilic crosslinkable monomer using an electron beam. (7) The anti-fog sheet according to claim 1, wherein the anti-fog layer contains 1 to 100 parts by weight of a surfactant. (8) In the antifogging sheet according to claim 1, the antifogging layer contains 100 parts by weight of a polymer and 5 to 20 parts by weight of a polymer.
An antifogging sheet characterized in that 0 parts by weight of a hydrophilic monomer and 1 to 300 parts by weight of a hydrophilic crosslinkable monomer are crosslinked with an electron beam. (9) The anti-fog sheet according to claim 8, wherein the anti-fog layer contains 100 parts by weight or less of a surfactant. (10) Claims 3, 5, 7, or 9
2. The anti-fog sheet according to item 1, wherein the anti-fog layer has many hydrophilic groups on its surface and also contains a surfactant that can leached out from inside the layer. (11) In the antifogging sheet according to any one of claims 1 to 10, the antifogging layer has a
An anti-fog sheet having a thickness of 30 μm. (12) The anti-fog sheet according to claim 11, wherein the anti-fog layer is colored. (13) The anti-fog sheet according to any one of claims 1 to 12, further comprising an adhesive layer. (14) The anti-fog sheet according to claim 13, further comprising a printed layer on the support film.