JP2000000935A - Anti-fogging sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-fogging sheet good in anti-fogging layer excellent in water resistance and damage resistance, capable of wiping the surface of the anti-fogging layer and suitable for an operating protective surface or the like. SOLUTION: An anti-fogging layer containing a water-soluble polymer containing at least one kind of acetoacetyl modified polyvinyl alcohol and a crosslinking agent is formed on one surface or both surfaces of a transparent support. The crosslinking agent is pref. added to at least one water-soluble polymer selected from a group consisting of glyoxal and a compd. represented by formula (wherein R1, R2, R3 and R4 are pref. a hydrogen atom or a methyl group)in an amt. of 10-200 wt.% on a solid basis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifogging sheet, and more particularly to an antifogging sheet having excellent water resistance and scratch resistance of an antifogging layer.

[0002]

2. Description of the Related Art In general, when performing surgery, doctors wear surgical protection surfaces to protect the face during surgery. There are two types of the protective surface for surgery: a regular use type and a disposable type.In the case of any of the surgical protective surfaces, it is desired that the light transmittance in the operating room is high without reflection by light in the operating room. However, if the protective face for surgery is clouded by moisture due to the breathing of the person wearing it,
It is desired that fogging does not occur because visibility is reduced and surgery becomes difficult. In addition, since the anti-fog layer formed inside the surgical protection surface is usually made of a water-soluble polymer, there is a problem in water resistance and strength, for example, a cloth or non-woven cloth containing water is used. Water resistance and scratch resistance are insufficient, such as the anti-fog layer peels off when it comes into contact and becomes more susceptible to slight impact when used for a long time and the moisture content becomes high. Even when dirt adheres to the surface of the cloudy layer, the antifogging layer itself peels off when wiped off, and further improvement has been desired from the viewpoint of usability.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide an anti-fogging sheet suitable for a surgical protective surface or the like which satisfies the above-mentioned demands, and which has good anti-fogging properties and anti-fogging properties. An object of the present invention is to provide an antifogging sheet which is excellent in water resistance and scratch resistance of a layer and which can wipe the surface of an antifogging layer.

[0004]

The above objects have been achieved by forming an anti-fog layer in which a specific water-soluble polymer is combined with a crosslinking agent. That is, the antifogging sheet of the present invention has an antifogging layer containing a water-soluble polymer containing at least one acetoacetyl-modified polyvinyl alcohol and a crosslinking agent on one or both surfaces of the transparent support. It is characterized by the following.

Here, the crosslinking agent is preferably at least one selected from the group consisting of glyoxal and a compound represented by the following general formula (1). It is preferable that the solid content is in the range of 10 parts by weight to 200 parts by weight with respect to parts by weight.

The general formula (1)

Embedded image

In the formula, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the antifogging sheet of the present invention will be described in more detail. Examples of the transparent support that can be used in the present invention include those generally known as insulating films.Examples of film materials include polyethylene terephthalate, polyesters such as polyethylene naphthalate, polyethylene, polyolefins such as polypropylene, polyamides, Polyester amide, polyether, polyimide, polyamide imide, polystyrene,
Polycarbonate, poly-p-phenylene sulfide,
Acrylic resins such as polyetherester, polyvinyl chloride, and poly (meth) acrylate can be used. Among them, polyesters having high insulation properties and excellent in durability and dimensional stability are preferable, and polyethylene terephthalate is particularly preferable. Although the thickness of the transparent support is not particularly limited, it is 10 to 250 μm (particularly 20 to 250 μm).
200 μm) is preferred because it is easy to handle.

The antifogging layer formed on the support contains a water-soluble polymer containing at least one acetoacetyl-modified polyvinyl alcohol and a crosslinking agent. A polyvinyl alcohol is appropriately referred to as PVA. A part of the hydroxyl group is an acetoacetyl group (CH ₃ C).
PVA substituted with OCH ₂ CO-). Preferred physical properties include a degree of modification of the acetoacetyl group of 0.5 to 20.
Mol%, degree of polymerization 200-4000, degree of saponification 80-9
It is about 9.9. If the degree of polymerization is too large, it is difficult to dissolve in water, and it becomes difficult to prepare a coating solution. If it is too small, the water resistance of the formed antifogging layer is reduced. Such acetoacetyl-modified PVA is, for example, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., Gosefimer Z200, Z200H, Z210, Z10
It is also available as a commercial product such as 0. The acetoacetyl-modified PVA has an excellent property of being able to form a film having appropriate water resistance by being crosslinked. Even if these acetoacetyl-modified polyvinyl alcohols are used alone,
Two or more kinds may be used in combination.

The amount of the acetoacetyl-modified PVA is calculated in terms of solid content in all binders of the anti-fog layer.
It is preferably at least 20% by weight. If the added amount is less than 20% by weight, the effect becomes insufficient, which is not preferable.

In the antifogging layer according to the present invention, in addition to the acetoacetyl-modified PVA, another water-soluble polymer is used together with the acetoacetyl-modified PVA within a range that does not impair the effects of the present invention. Can be. The polymer that can be used in combination is a polymer having a hydrophilic group. Examples of such polymers include polyamide, gelatin, unmodified or polyvinyl alcohol other than acetoacetyl-modified,
Examples include polyacrylic acid, polyamic acid, and other ionic conductive resins. Among these polymers, ionic conductive resins are particularly preferred. As the ionic conductive resin, a resin having an ionic hydrophilic group in a side chain is preferable, and as the ionic hydrophilic group, those having a cationic quaternary ammonium base or a sulfone group are particularly preferable in terms of cost. It is preferred in that respect.

A crosslinking agent is added to the water-soluble polymer,
An antifogging layer having good water resistance and scratch resistance is formed. The crosslinking agent used here is not particularly limited as long as it is a known crosslinking agent for a water-soluble polymer. However, when the crosslinking of the water-soluble polymer progresses rapidly in the coating solution, the viscosity of the antifogging layer coating solution increases, not only the production suitability decreases, but also it becomes difficult to form a uniform layer. Since no cross-linking is performed, the water resistance and the like of the anti-fog layer are reduced. From these properties, it is preferable that the crosslinking agent is at least one selected from the group consisting of glyoxal or a compound having two hydroxyl groups (vicinal diol) represented by the following formula.

General formula (1)

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In the formula, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, preferably a hydrogen atom or a methyl group.
Of these, preferred specific examples are shown below, but are not limited thereto.

[0015]

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The amount of the crosslinking agent to be added depends on the amount of the water-soluble polymer 1
The solid content is preferably 10 parts by weight or more based on 00 parts by weight. When the addition amount is less than 10 parts by weight, the water resistance of the anti-fog layer becomes insufficient. Generally, an acetoacetyl-modified PVA solution mixed with a cross-linking agent decreases the stability of the coating solution when the pH is increased. However, by combining with the cross-linking agent of the present invention, a coating solution having good liquid stability in a low pH region is applied. It becomes a liquid. As the amount of the crosslinking agent added increases, the pH of the antifogging layer coating solution decreases and shifts to the acidic side, making gelation difficult. That is, when the amount of addition is large, the stability of the coating solution is improved, and further, after drying, the acid serves as a catalyst to promote cross-linking, which facilitates the development of favorable water resistance and scratch resistance. As a result, both liquid stability, water resistance and scratch resistance were achieved. Thus, the finally obtained anti-fog layer has good anti-fog properties, and excellent water resistance and scratch resistance. Even if the surface is wiped with a cloth containing water, the anti-fog layer is obtained. Is not peeled or damaged. However, considering the cost, the addition amount is 2
It is preferably not more than 00 parts by weight.

In forming the antifogging layer on the antifogging sheet of the present invention, a solution of a water-soluble polymer, which is an essential component, and a crosslinking agent are mixed with water and other additives to prepare a coating solution for the antifogging layer. Then, it may be applied on a transparent support and dried. However, when the compatibility of the water-soluble polymer is reduced by the combined use of the additives, a good anti-fogging property can be obtained by using a polar solvent such as methanol, ethanol, 1-propanol and 2-propanol and a mixed solvent in combination. A layer coating solution can be prepared.

The antifogging layer has a weight average particle diameter of 5 to 5.
30 nm of transparent inorganic particles can be contained.
When the inorganic particles are contained, it is desirable that the inorganic particles are partially exposed on the surface of the antifogging layer by adjusting the thickness of the antifogging layer and the size of the inorganic particles. Such a state is suitable for preventing the occurrence of scratches and the like on the surface of the antifogging layer. Particle size of inorganic particles is 5
If it is smaller than nm, the effect of preventing scratches or the like from being generated on the surface of the anti-fog layer is small. Examples of the inorganic particles include clay, talc, diatomaceous earth, calcium sulfate, and aluminum hydroxide. Known additives such as a surfactant, a slipping agent, and a matting agent can be used in combination with the antifogging layer coating solution for the purpose of improving coating properties and for other purposes.

The thickness of the antifogging layer is 0.02 μm or more and 0.1
It is desirable that the thickness be less than μm or more than 1.1 μm and about 5 μm or less. This is because when the thickness is in the range of 0.1 to 1.1 μm, rainbow unevenness or the like easily occurs due to the influence of light interference or the like. On the other hand, if the antifogging layer is too thin, it is difficult to obtain the desired antifogging property, and if it is too thick, the transparency and visibility deteriorate, so neither is preferable.

The antifogging layer according to the present invention may be formed directly on the transparent support, or may be formed after forming an undercoat layer. Examples of the undercoat layer include a layer containing a polymer binder such as gelatin or latex as a main component, and a layer containing a conductive metal oxide and a polymer binder similar to the dustproof layer described later. These undercoat layers can be used as an undercoat layer by overlaying the former and the latter undercoat layers as necessary.

The anti-fogging sheet of the present invention may have the anti-fogging layer as described above on one or both sides of a transparent support, and is used as, for example, a protective surface for surgery. In such a case, it is preferable to form an anti-fog layer on the side located on the face of a person and to provide a dust-proof layer or an overcoat layer on the other surface.

The dustproof layer is formed outside the surgical protection surface,
Prevents dust and dirt from adhering to the surface and lowering visibility
The conductive metal oxide and the polymer binder
It is preferable that it contains. Where the conductive gold
As a group oxide, zinc oxide doped with aluminum
(0.12-0.25 μm), doped with antimony
Titanium oxide (0.2 μm), zinc oxide (1.0 μm),
Needle-like crystals of tin oxide doped with antimony (long axis:
0.2 to 4.0 μm, short axis: 0.01 to 0.04 μ
m), antimony-doped tin oxide with barium sulfate
Particles coated with K _TwoO ・ nTiO_Two/ SnO_TwoSb
_TwoO_Three(Short axis 0.4-0.7 μm, long axis 10-20 μm
m) and the like.

As the conductive metal oxide, in particular, acicular tin oxide particles doped with antimony (major axis: 0.2 to 4.
0 μm, short axis: 0.01 to 0.04 μm).
Ordinary tin oxide particles doped with antimony darken the color of the conductive layer to be added and deteriorate the color. However, such defects are not present in the case of acicular tin oxide. In addition, in the case of spherical particles that are not acicular, in order to obtain predetermined conductivity, the amount of addition is larger than that of acicular particles, and blackening of the sheet is remarkable because antimony is distributed throughout the spherical particles. However, in the case of acicular tin oxide, the amount of doped antimony for obtaining a predetermined conductivity is smaller than that of the spherical particles because the doped antimony exists only on the surface of the acicular crystal.
Therefore, the conductive particles to be added to the dustproof layer in the present invention are particularly preferably acicular tin oxide particles doped with antimony. In addition, when the antimony-doped acicular tin oxide particles are used, there is no humidity dependency that occurs when other conductive particles are used, that is, the conductivity is stable from low humidity to high humidity without being affected by humidity. Thus, a conductive layer having excellent transparency can be obtained.

The antimony-doped acicular tin oxide particles have a major axis of 0.2 to 4.0 μm and a minor axis of 0.01 to 0.1 μm.
It is preferably 0.4 μm, and more preferably the aspect ratio is 5 or more. Those having these ranges are particularly preferable because they can form transparency and uniform conductivity. The thickness of the dust-proof layer is not particularly limited, but is preferably from 0.03 to 1.0 μm, and more preferably from 0.05 to 0.2 μm.

Examples of the polymer binder include vinyl chloride, vinylidene chloride, vinyl acetate, styrene, methylstyrene, butadiene, acrylic acid, alkyl acrylate (alkyl group having 2 to 4 carbon atoms), PMM
A, a homoalkyl such as hydroxyalkyl acrylate, maleic anhydride or acrylonitrile, and a copolymer of at least two kinds selected from these monomers, polyester, gelatin, polyamide, etc. are used. Among them, gelatin, polyester, acrylic Resins are preferred.

The amount of the conductive substance added to the dustproof layer is 50 to 90% by weight, preferably 70 to 90% by weight, based on the total solid content of the layer.
It is preferably from 90 to 90% by weight, particularly preferably from 75 to 85% by weight. When the content is less than 50% by weight, poor running tends to be caused by insufficient conductivity and adhesion of dust, and when the content is more than 90% by weight, defects in appearance such as coloring and haze tend to occur.

The overcoat layer is preferably a layer made of a resin having a refractive index difference of 0.06 or less from the refractive index of the antifogging layer, and a resin having a smaller refractive index difference is more preferable. The difference between the overcoat layer and the refractive index of the anti-fog layer is 0.0
Use of a resin having a refractive index of more than 6 is not preferred because the transparency of the antifogging sheet is reduced. Therefore, the resin used for the overcoat layer should be selected according to the relative relationship with the polymer used for the anti-fog layer.

As the resin used for such an overcoat layer, from the viewpoint of transparency, for example, an acrylic resin is preferable, and particularly, a copolymer of methyl methacrylate and an acrylate is particularly preferable. In addition, it is preferable from the viewpoint of production suitability (dissolves easily in general-purpose solvents, MEK, toluene, and the like). In connection with the resin used for the anti-fog layer, for example, a crosslinkable PVA resin or a modified P
VA resin and the like are preferred.

Further, when a fluorine surfactant and / or a fluorine-based transparent polymer is further added to the main film-forming resin to the overcoat layer, adhesion of dust on the surface of the overcoat layer can be prevented. Generation of scratches and the like can be prevented. Here, as the fluorine-based surfactant, for example, Megafac F-
178K (Perfluoroalkyl group-containing oligomer, manufactured by Dainippon Ink and Chemicals, Inc.) and the like. Examples of the fluorine-based transparent polymer include Aron GF-300
(Comb type graft polymer manufactured by Toa Gosei Chemical Co., Ltd.) and the like. The addition amount of these fluorine surfactants and / or fluorine-based transparent polymers is used within a range that does not impair the transparency of the overcoat layer.

Further, the difference between the overcoat layer and the polymer constituting the overcoat layer is 0.0
Polymer particles having a refractive index of 6 or less can be contained. In particular, the polymer particles are preferably crosslinked polymer particles. When such polymer particles are contained in the overcoat layer, an antireflection effect on the surface of the overcoat layer is exhibited, the light transmittance is improved, and the transparency of the antifogging sheet is increased. As these polymer particles, for example, polyethylene, polyolefin such as polypropylene, polymethyl methacrylate, styrene resin, melamine resin, epoxy resin and the like are used, but organic polymer compounds, preferably thermoplastic resins, among them, especially polyolefin filler Is preferably used. The polyolefin particles not only improve the slipperiness of the layer, but also increase the heating temperature (100 to 120) when drying the coating liquid containing the filler.
C.), the spherical particles are slightly flattened due to softening, and the slipperiness and running properties are further improved. The polymer particles are added in an amount of 1 to 10% by weight, preferably 1 to 5% by weight, particularly preferably 1 to 3% by weight, based on the total solid content of the overcoat layer. If it is less than 1% by weight, the slipperiness tends to decrease, and if it is more than 10% by weight, haze tends to occur.

In the present invention, the sheet is referred to as an anti-fogging sheet for convenience, but this does not particularly limit the thickness and form of the sheet of the present invention. The present invention also includes an antifogging sheet formed into a plate-like or lens-like shape having no flexibility.

[0032]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples.

Example 1 Preparation of coating solution for anti-fog layer 8% by weight of acetoacetyl-modified PVA as binder
(Gorse Pharma Z200, saponification degree 99% or more, 4
%, Viscosity at 20 ° C. (hereinafter referred to as viscosity) 13.3 to 1
4.3 cp, manufactured by Nippon Synthetic Chemical Industry)
2.7 g, 40% glyoxal aqueous solution 2 as a crosslinking agent
0 g, 2-ethylhexyl sulfosuccinate-based surfactant (Lapisol B90, manufactured by NOF Corporation) 2% aqueous solution 1
7 g and 8 g of a 2% aqueous solution of sodium (4-nonylphenoxytrioxyethylene) butylsulfonate were added while sequentially mixing to prepare a coating solution having a binder content of 4.5%.

Preparation of antifogging sheet A 100 μm PET base subjected to corona discharge treatment was coated with an undercoat layer coating solution having the following composition after drying to a coating amount of 0.15 μm.
m, and after drying, the anti-fog layer coating solution is applied thereon such that the applied amount after drying is 1.5 μm, and dried in an oven at 50 ° C. to obtain a sheet for anti-fog. I got

Undercoat layer coating solution Gelatin (Nitta 761 gelatin) 2 parts by weight Antimony-doped acicular tin oxide (FS-10D; Ishihara Sangyo Co., Ltd.) 600 parts by weight Alkyl benzene ether polyoxyethylene (EMALEX W160; Nippon Emulsion) 1 part by weight Water 397 parts by weight

Example 2 In the preparation of the coating solution for the anti-fog layer, Gosefimer Z200H (a saponification degree of 99% or more, viscosity of 13.0 to 16.0 cp, Japan) was used as the acetoacetyl-modified PVA in place of Gosefimer Z200. (Synthetic Chemical Industry Co., Ltd.)
An antifogging sheet was obtained. (Example 3) In the preparation of an antifogging layer coating solution, as an acetoacetyl-modified PVA, Gosefimer Z100 (a saponification degree of 98.5% or more, viscosity of 4.6 to 6.0 cp, Nihon Gosei) was used instead of Gosefimer Z200 Except for using Chemical Industry Co., Ltd., was performed in the same manner as in Example 1 to obtain an antifogging sheet.

Example 4 In the preparation of the coating solution for the anti-fog layer, Gosefimer Z210 (saponification degree 95-97%, viscosity 12.5-15.5 cp, The procedure was performed in the same manner as in Example 1 except that
An antifogging sheet was obtained. (Example 5) In the preparation of the coating solution for the anti-fog layer, the same procedure as in Example 1 was carried out except that the amount of the cross-linking agent glyoxal was changed from 20 g to 40 g and the amount of water was changed from 32.7 g to 12.7 g. Thus, an antifogging sheet was obtained. (Example 6) In the preparation of the coating solution for the anti-fog layer, a compound in which R ¹ , R ² , R ³ and R ⁴ are all hydrogen atoms in the structure represented by the above general formula was used instead of glyoxal as a crosslinking agent. Except that it was used as a crosslinking agent, the same procedure as in Example 1 was carried out to obtain an antifogging sheet.

Example 7 In the preparation of the coating solution for the anti-fogging layer, R ¹ , R ² , R ³ and R ⁴ were H, H, and R ^{4 in} the structure represented by the above general formula instead of glyoxal as a crosslinking agent. A fogging-preventing sheet was obtained in the same manner as in Example 1 except that a crosslinking agent of H and CH ₃ was used. (Example 8) In the preparation of the coating solution for the anti-fogging layer, R ¹ , R ² , R ³ and R ⁴ were each replaced with CH ₃ , H,
A fogging-preventing sheet was obtained in the same manner as in Example 1 except that a crosslinking agent of H and CH ₃ was used.

(Example 9) In the preparation of the coating solution for the anti-fogging layer, R ¹ , R ² , R ³ and R ⁴ were CH ₃ and CH in the structure represented by the above general formula instead of glyoxal as a cross-linking agent. _{The same} procedure as in Example 1 was carried out except that a crosslinking agent of ₃ , H, H was used to obtain an antifogging sheet. (Example 10) In the preparation of the coating solution for the anti-fogging layer, R ¹ , R ² , R ³ and R ⁴ were CH ₃ and CH in the structure represented by the above general formula instead of glyoxal as a crosslinking agent.
_3, H, except for using the crosslinking agent is CH ₃ the same manner as in Example 1 to obtain an antifogging sheet.

Example 11 In preparing the coating solution for the antifogging layer, the amount of the cross-linking agent glyoxal was changed from 20 g to 2.5 g.
The same procedure as in Example 1 was carried out except for using g, to obtain an antifogging sheet. (Example 12) An antifogging sheet was obtained in the same manner as in Example 1, except that the amount of the crosslinking agent glyoxal used was changed from 20 g to 1.8 g in the preparation of the coating solution for the antifogging layer.

(Comparative Example 1) An antifogging sheet was obtained in the same manner as in Example 1, except that the crosslinking agent glyoxal was not used. (Comparative Example 2) In the preparation of the coating solution for the anti-fog layer, carboxy-modified PVA (KL-318, manufactured by Kuraray Co., Ltd.) was used instead of acetoacetyl-modified PVA (Gorse Pharma Z200), and 20 g of the crosslinking agent glyoxal was used instead. Epoxy polyamide-based crosslinking agent (Wet Master 5
(00, manufactured by Toho Chemical Co., Ltd.) was carried out in the same manner as in Example 1 except that 6.90 g of an antifogging sheet was obtained.

(Comparative Example 3) In the preparation of the coating solution for the antifogging layer, acetoacetyl-modified PVA (Gorse Pharma Z2
00) instead of silanol-modified PVA (R2130,
20 g of cross-linking agent glyoxal using Kuraray Co., Ltd.
In place of 14.0 g of a 20% colloidal silica dispersion (Snowtex, manufactured by Nissan Chemical Co., Ltd.), the same procedure as in Example 1 was carried out to obtain an antifogging sheet.

The performance of the antifogging sheets obtained in the above Examples and Comparative Examples was evaluated according to the following evaluation methods.
The results are shown in Table 1 below. (Evaluation method) Anti-fogging property: In a room at 10 ° C, breath is blown, and the degree of fogging of the blown surface is visually evaluated according to the following criteria. Water resistance: One drop of water was dropped on the surface, left for 1 minute, wiped off with a tissue paper, and visually observed for changes in the surface of the anti-fog layer. Scratch resistance: Rubbed with a dry gauze while applying a load of 1 kg, and the occurrence of scratches on the surface of the anti-fog layer was visually evaluated.

Cleanability: The surface was rubbed with gauze impregnated with ethanol for 1 minute, rubbed with the gauze 10 times, dried, and visually evaluated for occurrence of scratches on the surface of the anti-fog layer. Liquid stability: After preparing the coating liquid for the anti-fog layer, the stability of the coating liquid was evaluated based on the presence or absence of precipitation, separation, change in viscosity, and the like. Each of these items was evaluated on a five-point scale: A: extremely good, B: good, C: normal, D: slightly poor, and E: poor. The practical level is rating C or higher.

[0045]

[Table 1] As is clear from the results in Table 1, all the antifogging sheets of the present invention reached practical levels in all of the antifogging properties, scratch resistance and water resistance. Further, the coating solution was resistant to cleaning with alcohol, and the stability of the coating solution was good. Example 1
-8 and Examples 9 and 10, the amount of the cross-linking agent added was 10% by weight to 2% by solids with respect to the water-soluble polymer.
Those in the range of 00% by weight were found to be particularly excellent. On the other hand, Comparative Example 1 using no crosslinking agent and Comparative Examples 2 and 3 using a PVA-based water-soluble polymer other than acetoacetyl-modified and a crosslinking agent suitable for it were all inferior in water resistance and did not reach a practical level. I understand.

[0046]

The antifogging sheet of the present invention has good antifogging properties, excellent water resistance and scratch resistance of the antifogging layer, and is capable of wiping the surface of the antifogging layer. It has an advantage that it is suitable for a protective surface or the like.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C08L 29/04 C08L 29/04 A 4H020 C09K 3/18 C09K 3/18 4J002 // C07D 319/12 C07D 319 / 12 F term (reference) 4C022 JA04 4F006 AA35 AA55 AB02 AB20 AB24 AB38 AB54 BA10 CA09 DA04 EA01 4F070 AA26 AB03 AB13 AC35 AC66 AE08 GA10 GB05 GC02 4F071 AA29 AA46 AC07 AC19 AE02 AF09 AF14 AF56 AH19 A0219H AK01B AK42 AK69B AK69K AL07B AR00A BA02 CA02B CA02H CA21 GB66 JA01A JB07 JB09B JK12 JL07 4H020 AA05 AB02 4J002 AD012 BE011 BE022 BG012 CL002 EE016 EL106 FD010 FD146 FD201 FD202 GF00

Claims (3)

[Claims] An anti-fogging layer comprising a water-soluble polymer containing at least one acetoacetyl-modified polyvinyl alcohol and a cross-linking agent formed on one or both surfaces of a transparent support. Fogging sheet. 2. The antifogging sheet according to claim 1, wherein the crosslinking agent is at least one selected from the group consisting of glyoxal and a compound represented by the following general formula (1). . General formula (1) In the formula, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. 3. The addition amount of the crosslinking agent is 10 parts by weight to 20 parts by weight based on 100 parts by weight of the water-soluble polymer.
3. The composition according to claim 1, wherein the amount is in a range of 0 parts by weight.
3. The antifogging sheet according to 1.