JP2001131536A - Cellulosic composition for preventing fog - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cellulosic composition for preventing fog, excellent in persistency of fog prevention. SOLUTION: This composition comprises a cellulose having <=100 average degree of polymerization, <=0.1 fraction of I type crystal ingredient, <=0.4 fraction of II type crystal ingredient and <=5 &mu;m average particle diameter as an anti-fogging agent. A coating film is obtained by applying and drying the above composition. A molded product is obtained by molding the above composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the function of a product in which the surface is fogged and the transparency is lowered or the surface is dewed when exposed to high humidity or when there is a sudden temperature change. Glass products such as transparent glass, which significantly reduce
For all products such as mirrors, glasses, goggles, plastic plates and plastic films.

[0002]

2. Description of the Related Art The need for anti-fog, ie, anti-fog effect is very high, but a universal anti-fog technology has not always been established. Fogging is a phenomenon in which a large number of fine water droplets are generated on a hydrophobic surface. To suppress this, it is necessary to impart hydrophilicity to the surface to make water droplets hard to generate. As a device for this, it is conceivable to coat a compound having a hydrophilic site such as a water-soluble polymer or a surfactant on a hydrophobic surface.
Due to the problem of adhesion between the hydrophobic surface and the hydrophilic compound, the effect is not permanent since the hydrophilic compound peels off over time under the use environment of many products. As a means for improving this, a hydrophilic compound is mixed with a hydrophobic coating agent which is the same as the base material or has excellent adhesion to the base material, and is coated on the surface of the base material. In this case, the degree of peeling over time can be suppressed as compared with the case where the hydrophilic compound is directly coated, but a certain amount of antifogging agent (hydrophilic compound) is mixed in order to enhance the antifogging effect. Advanced dispersion technology is required to uniformly disperse this in a hydrophobic coating agent and to ensure transparency. In addition, for example, when a water-soluble polymer is mixed as an anti-fogging agent, water comes into contact with the water-soluble polymer domain finely dispersed in the coating layer, so that the water-soluble polymer gradually enters the aqueous phase. And the anti-fogging effect also decreases with time. Further, for example, even when a low molecular weight surfactant is used as an antifogging agent, the surfactant is gradually washed off from the surface by diffusion of the surfactant molecule in the coating layer, and the like.
At present, it is not possible to expect the durability of the anti-fog effect.

[0003]

In view of the above prior art, a water-resistant hydrophilic compound is desirable as an antifogging agent having excellent durability. However, this is a trade-off, and many compounds will dissolve in water on the order of molecules if their hydrophilicity is high. Even if there is a hydrophilic compound that is strong in water, that is, it does not easily dissolve in water, it is very difficult to coat this in a transparent state, or to disperse it evenly in a hydrophobic compound to form a transparent coating It is. The present invention overcomes such difficult problems and dramatically improves the durability of the anti-fogging effect. The anti-fog cellulose composition, a coated film containing the same, and a coated film obtained by applying the composition And a molded article obtained by molding the composition.

[0004]

According to the present invention, (1) a cellulose composition for antifogging, which comprises cellulose as an antifogging agent and is uniformly dispersed, and (2) cellulose has an average The polymerization degree is 100 or less, the fraction of cellulose I type crystal component is 0.1 or less, the fraction of cellulose II type crystal component is 0.4 or less, and the average particle size is 5 μm or less. (3) The cellulose composition for antifogging according to the above (1), wherein (3) cellulose is contained in water, an organic solvent or a mixed solvent of water and an organic solvent in an amount of 0.1 to 10% by weight. (4) The anti-fogging cellulose composition according to the above (3), further comprising a latex and / or a hydrophobic polymer. 5) Cellulose in hydrophobic polymer resin (5) The cellulose composition for anti-fogging described in (1) or (2) above, wherein (6) the (1), (2), (3) or (4) )) The antifogging coating film obtained by applying and drying the antifogging cellulose composition described in (1), (7)
(3) An anti-fogging molded article obtained by molding the anti-fogging cellulose composition according to (4) or (5).

Hereinafter, the present invention will be described in detail. The present invention is a composition for cellulose for antifogging containing cellulose as an antifogging agent. Cellulose is roughly classified into natural cellulose and regenerated cellulose obtained by dissolving and coagulating the same in a solvent. Since regenerated cellulose has higher hygroscopicity (hydrophilicity), cellulose in the present invention is regenerated. Cellulose is more preferable, among them, the average degree of polymerization is 100 or less, the fraction of cellulose I type crystal component is 0.1 or less, the fraction of cellulose II type crystal component is 0.4 or less, And the average particle size is 5
Cellulose having a size of μm or less is more preferred.

Here, the average degree of polymerization of cellulose, the fraction of various crystal components, and the average particle diameter were evaluated as follows; the average particle diameter of the cellulose fine particles was determined by measuring the average particle diameter of the cellulose as a raw material of the composition of the present invention. The water dispersion was measured with a laser diffraction type particle size distribution measuring device (manufactured by Horiba, Ltd., laser diffraction / scattering type particle size distribution measuring device LA-920; the lower limit detection value was 0.02 μm). In order to measure the particle size in a state where the association between the cellulose particles in the dispersion medium was cut as much as possible, a sample was prepared in the following step. After diluting the dispersion with water so that the cellulose concentration is about 0.5%,
Mixing is performed for 10 minutes with a blender having a rotation speed of 15000 rpm or more to form a uniform suspension. Next, an aqueous dispersion sample obtained by subjecting this suspension to ultrasonic treatment for 30 minutes was supplied to a cell of a particle size distribution measuring device, and subjected to ultrasonic treatment again (3 minutes), and then the particle size distribution was measured. . The average particle diameter of the present invention corresponds to the weight average particle diameter obtained from the volume conversion particle size distribution calculated from the Mie scattering theory.

The measurement of the fraction of each crystal component of cellulose and the average degree of polymerization referred to in the present invention was carried out by drying the dispersion by a method such as drying under reduced pressure to obtain a dried cellulose sample. Cellulose type I is a crystal form found in natural cellulose, and cellulose type II is a crystal form mainly observed in regenerated cellulose (however, the fraction of crystal components can be controlled by the conditions of regeneration).

[0008] Cellulose I and the fraction of cellulose II type crystal component (chi _I and chi _II) was calculated by the following procedure by a wide-angle X-ray diffraction method (using a Rigaku K.K. rotor flex RU-300) .

[0009] Fraction of cellulose type I crystal component (χ _I )
Is to pulverize the dried cellulose sample into powder and form into tablets,
In the wide-angle X-ray diffraction diagram obtained by the reflection method with the source CuKα,
From the absolute peak intensity h _{0 at} 2θ = 15.0 ° attributed to the (110) plane peak of the cellulose type I crystal and the peak intensity h ₁ from the baseline at this plane interval, it is determined by the following equation (1). Values were used.

Similarly, the fraction of the cellulose type II crystal component
(Χ_II) Is to pulverize the dried cellulose sample into powder and make it into tablets
Formed and converted to wide-angle X-ray diffraction diagram
Attributable to the (110) plane peak of cellulose II crystal.
Absolute peak intensity h at 2θ = 12.6 °₀ ^*
And the peak intensity h from the baseline at this plane spacing
₁ ^*Therefore, the value obtained by the following equation (2) was used.

Χ _I = h ₁ / h ₀ (1) χ _II = h ₁ ^* / h ₀ ^* (2) FIG. 1 is a schematic diagram for determining χ _I and χ _II .

The average degree of polymerization (DP) specified in the present invention is:
The specific viscosity of a dilute cellulose solution obtained by dissolving the above dried cellulose sample in cadoxene was measured with an Ubbelohde viscometer (25 ° C.), and the intrinsic viscosity number [η] was used to determine the following viscosity equation (3).
And the value calculated by the conversion formula (4) was adopted.

[0013] ^{[η] = 3.85 × 10 -2} × M W 0.76 (3) DP = M W / 162 (4)

In the present invention, the fraction of the cellulose type I crystal component is more preferably 0.1 or less, and particularly preferably 0.01 or less.
6 or less, the fraction of the cellulose type II crystal component is more preferably 0.4 or less, particularly preferably 0.3 or less, the average particle diameter of cellulose measured by the above measurement method is preferably 5 μm or less, It is more preferably at most 2 μm, particularly preferably at most 1 μm. The lower limit of the average particle diameter can be set to about 0.02 μm, which is close to the lower limit of detection of the above-mentioned measuring method. The reason why cellulose that satisfies this condition has an excellent ability as an antifogging agent is, of course, finely divided and shows high dispersibility, but is low in crystallinity and contains many amorphous regions, so that it is conventionally used. Compared to the cellulose material, it is easy to take in moisture (easy to absorb moisture), and those satisfying these are excellent in transparency. Naturally, the smaller the average particle size, the higher the dispersibility. Such a composition comprising cellulose of the present invention is not only extremely highly dispersed in a dispersion medium such as water, but also has extremely good miscibility with various components. As a result, cellulose, which is an anti-fogging agent, is highly dispersed in the blended components, and the composition itself exhibits the anti-fogging property. Further, the average polymerization degree (DP) of the cellulose is preferably 100 or less, more preferably 50 or less.
If it is below, the above characteristics can be further improved. Since the cellulose of the present invention is a water-insoluble cellulose, the DP is 20 or more.

The cellulose composition of the present invention preferably contains 0.1 to 10% by weight of cellulose in water, an organic solvent or a mixed solvent of water and an organic solvent. Here, the blending amount of cellulose is determined in consideration of the content of the composition. That is, in the case of a composition containing only cellulose as a solid content upon drying, the concentration of cellulose should be determined so as to maintain a viscosity suitable for coating,
Also, by dispersing cellulose in a hydrophobic coating agent such as latex particles or nitrified cotton, it is possible to increase the water resistance of the coating film as compared to a cellulose-only coating, but in this case, it is dried. It is necessary to determine the amount of cellulose so that the anti-fogging property can be exhibited in such a case. In the latter case, naturally, the amount of cellulose is determined by the properties of the hydrophobic coating agent. As described above, the content is determined in consideration of the content of the composition. When the content of cellulose is less than 0.1% by weight, the anti-fogging effect is not sufficiently exhibited, and when the content exceeds 10% by weight, the viscosity becomes high. It is not preferable in terms of workability. In view of the viscosity at the time of coating, the content of cellulose in the composition is more preferably in the range of 0.2 to 3.0% by weight.
The dispersion medium for the cellulose composition of the present invention is selected from water, various organic solvents such as alcohols, and a mixed solvent of water and an organic solvent, but is not particularly limited thereto. A dispersion medium having a relatively low boiling point and easy to dry, such as water or lower alcohols, is desirable. At the same time, in the present invention, it is also important that the mixture is uniformly dispersed in these dispersion media without causing aggregation. In order to enhance dispersibility, polyhydric alcohols such as glycerin, and various additives such as ethylene glycol, polyethylene glycol, and nonionic surfactant may be included. In addition, since cellulose is generally not dissolved in a solvent having a low boiling point as described above,
In the present invention, it is desirable that the composition is substantially in the form of fine particles.

As the base material for imparting anti-fogging properties, naturally, substances that easily fogging pose a problem in the use of such materials, for example, transparent glasses, mirrors, glasses, goggles, highly transparent plastic plates And highly transparent plastic films. However, even an opaque substance is an object of the present invention as long as it is a substance that needs to be prevented from fogging.

Furthermore, the anti-fogging cellulose composition of the present invention is essentially intended to prevent water from agglomerating as small water droplets on the surface of the substance, so that it can also be applied to the purpose of preventing dew condensation. In this case, in particular, all hydrophobic materials are considered as base materials for the coating. In particular, it may be an opaque material.

The organic solvent of the present invention means any organic solvent applicable as a solvent or a dispersion medium. Representatives include methanol, ethanol, isopropanol, sec-butanol, tert-butanol,
Acetone, N, N-dimethylformamide, ethyl acetate, butyl acetate, cellosolve acetate, methyl cellosolve,
Examples include ethyl cellosolve, n-hexane, n-heptane, petroleum naphtha, cyclohexane, toluene, xylene, petroleum ether and the like.

In the present invention, the term "uniformly dispersed" means that the components such as cellulose are not partially aggregated, are visually uniform, and are transparent or translucent.

In the composition of the present invention, various hydrophobic substances and various functional substances added to enhance the function of the composition are included as components contained in addition to cellulose and water or an organic solvent as a dispersion medium. Can be. Specific examples of the hydrophobic substance include, for example, an acrylic resin latex, a styrene-butadiene resin latex, a urethane resin latex, a relatively hydrophobic latex such as a Saran resin latex, and an organic dispersion medium. When using a solvent or a mixed solvent of water / organic solvent,
Hydrophobic polymers that can be dissolved therein (eg, polymethyl acrylate, polymethyl methacrylate, polystyrene, polybutadiene, polyethylene, polypropylene,
Cellulose derivatives such as polyvinyl acetate, polyvinyl chloride, polyurethane, silicone resin, polyvinyl fluoride, polyacetal, polyethylene terephthalate, nylon 66, poly-p-phenylene terephthalamide, nitrified cotton, cellulose acetate, cellulose acetate-butyrate, etc.) It is. These may be used alone or in combination of several polymers. In addition, in order to enhance the function of the antifogging cellulose composition, additives other than the above-described compounds may be added to the extent that the obtained composition functions as a coating agent. For example, an antifogging aid or a hydrophilic low molecule such as glycerin or a hydrophilic polymer such as polyoxyethylene or polyvinyl alcohol may be added to enhance the dispersion stability of the composition. Further, a composition containing no dry solid component other than cellulose (that is, only cellulose and a dispersion medium) is naturally included in the present invention.

One preferred example of the preparation of the composition of the present invention is described below. The cellulose is dispersed and dissolved in a mineral acid (for example, an aqueous sulfuric acid solution) capable of dissolving the cellulose by 50% by weight or more, and the resulting dispersion or solution is reprecipitated in water to obtain a coagulated liquid as it is, or further hydrolyzed. After the treatment, it is washed with water to form a gel having a pH of 3 or more. Next, the obtained gel-like substance is used as it is or after substituting it with an organic solvent such as ethanol, and then subjected to a fine treatment to prepare an aqueous dispersion of cellulose or a dispersion in an organic solvent. At this time, application of an ultrahigh-pressure homogenizer, a bead mill, an ultrasonic treatment, or the like is effective as the fine processing. The final fine processing may be performed a plurality of times as necessary. Natural cellulose such as wood pulp or cotton can be suitably used as the starting cellulose, but regenerated cellulose may be used. Next, various components are appropriately added to the dispersion of the cellulose particles thus obtained, and a mixing treatment is performed according to the purpose. For example, after mixing an aqueous dispersion of cellulose and latex, an organic solvent that can be mixed with water is appropriately added, and a uniform coating liquid is obtained even when subjected to advanced mixing treatment (such as a high-pressure homogenizer or an ultra-high-pressure homogenizer). Obtainable. Moreover,
First, an aqueous dispersion of cellulose is prepared as an aqueous phase, and a polymer solution in which the above-described polymer resin is dissolved is added thereto, and the mixture is emulsified and dispersed. In addition, a composition in which cellulose is highly dispersed can be obtained. In this case, a more suitable composition can be obtained by using an advanced disperser such as a high-pressure homogenizer as a means for emulsification and dispersion.

Further, the present invention relates to a cellulose composition for antifogging wherein cellulose is contained in an amount of 0.1 to 10% by weight in water, an organic solvent or a mixed solvent of water and an organic solvent, or a latex and a cellulose. And / or an antifogging coating film obtained by applying and drying a cellulose composition for antifogging obtained by containing a hydrophobic polymer.

The anti-fog coating film referred to herein is a transparent or translucent hydrophobic material having a small anti-fog effect (various transparent glasses such as window glass, displays for televisions and personal computers,
Mirror, glasses, goggles, various plastic plates, various plastic films, etc.) and opaque coating materials for materials that require anti-fog and dew condensation prevention. The composition of the coating film of the present invention has a cellulose content of 5 to 5.
In the range of 100% by weight, a composition that reduces the antifogging property is determined according to the properties of the hydrophobic substance to be complexed and the required needs. The cellulose / water dispersion prepared by the method described above may be directly coated on glass or the like, but it can be combined with the latex or polymer resin described in order to firmly fix to the surface and improve water resistance. Thus, a coating film which is strong and has excellent adhesion to a hydrophobic surface can be obtained. Such an antifogging coating film can be obtained by applying the antifogging cellulose composition provided by the present invention to a target material and drying.

The anti-fogging molded article of the present invention means an anti-fogging film or a transparent resin having anti-fogging properties. The film or resin is required to have anti-fogging properties and to prevent condensation. All products. The composition of the anti-fogging molded article of the present invention is such that the content of cellulose is in the range of 5 to 100% by weight, and the composition is such that the anti-fogging property is reduced according to the properties of the hydrophobic substance to be complexed and the required needs. decide. The cellulose / water dispersion prepared by the above-mentioned method may be dried to obtain a transparent resinous molded article of 100% cellulose, but may be firmly formed by complexing with the above-mentioned hydrophobic polymer resin. An anti-fog resinous molded article can also be obtained.

Further, the antifogging molded article of the present invention is obtained by coating a cellulose composition for antifogging of the present invention prepared in an appropriate composition on a dry heat roll, evaporating the dispersion medium, By winding this, it can be obtained as an antifogging film. Further, a water-compatible hydrophobic polymer solvent (having a boiling point higher than that of water) is mixed with the cellulose / water dispersion prepared by the above-mentioned method to form a uniform dispersion. Evaporate and concentrate, and knead this dispersion into a melted hydrophobic polymer melt to mix a certain amount of cellulose by kneading it little by little. A resin molded product having an anti-fogging effect can also be prepared by preparing a melt, which is the anti-fogging cellulose composition of the present invention, containing 70% by weight, flowing it into a mold and cooling it. If the amount of cellulose contained in the hydrophobic polymer resin is too small, the antifogging effect of the composition will not be exhibited, and if it is too large, the hydrophobicity and the like will be low, and the advantage of forming a composite with the resin will be lost. In the composition of the present invention in which cellulose is dispersed in a hydrophobic polymer resin, the content of cellulose is preferably in the range of 5 to 70% by weight, and more preferably in the range of 10 to 60% by weight.

[0026]

EXAMPLES The antifogging cellulose composition containing the cellulose of the present invention as an antifogging agent will be specifically described by way of examples, but the present invention is not limited to the examples.

(Preparation of Raw Cellulose)
-5 ° C so that the pulp content becomes 4% by weight in 5% by weight sulfuric acid.
And the cellulose / sulfuric acid solution was poured into water having a weight ratio of 2.7 to the cellulose / sulfuric acid solution under vigorous stirring to precipitate cellulose. After hydrolyzing the obtained flaky cellulose dispersion at 80 ° C. for 40 minutes,
After filtration and washing with water, an aqueous dispersion of paste-like cellulose fine particles was obtained. The cellulose concentration in the obtained gel is 6.
It was 0% by weight. Next, the gel was diluted with ion-exchanged water to a cellulose concentration of 3.0% by weight, and then mixed by a blender at a rotation speed of 15,000 rpm for 5 minutes. Then, this diluted solution was added to an ultrahigh-pressure homogenizer (Mic).
rofluidizer M-110EH, manufactured by Mizuho Industry Co., Ltd.) at an operating pressure of 1,750 kg / cm ² .
This was repeated to obtain a gelled cellulose dispersion having high transparency. The average particle diameter of the cellulose evaluated by the method described was 0.24 μm, and the fractions of the cellulose I-type crystal component and the cellulose II-type component of the cellulose particles were each 0.1.
03 and 0.16. This transparent aqueous dispersion of cellulose fine particles is designated as X0.

Example 1, Comparative Example 1 X0 was obtained by diluting X0 with ion-exchanged water to a cellulose concentration of 1.2% by weight, and then performing a mixing treatment in a blender at 15,000 rpm for 5 minutes. The resulting transparent and viscous dispersion was designated as J1, and the result of a coating film obtained by coating this on glass was designated as Example 1.

Hydroxyethylcellulose (HEC; Tokyo Chemical Co., Ltd .; 4,500-6,000 cps (2w)
The result of a coating film obtained by coating a 1.5% by weight aqueous solution (t% in water, 25 ° C.)) of H1 and coating this on glass is referred to as Comparative Example 1.

After the dispersion J1 and the aqueous solution H1 were each cast on a glass preparation using an applicator,
These were dried at 50 ° C. to give two coated glass preparations. These were both transparent coatings. As a measure of the anti-fog properties of these coating surfaces, 3
The film kept in an atmosphere of 5 ° C. and 60% RH for 1 hour was evaluated for cloudiness immediately after being placed in a humidity control room of 10 ° C. and 70% RH. As a result, the uncoated side (back side)
Although cloudiness was clearly recognized, the coated surface of both samples did not become cloudy at all, and the antifogging effect of the coating was recognized.

Next, after placing each sample for 1 hour in an environment of 35 ° C. and 95% RH, each coated surface was rubbed with a finger in this environment. Although the state did not change at all, the surface coated with H1 was rubbed for a while, the surface became sticky and the surface became water-soluble and became opaque.

Further, when tap water was continuously fed directly to the coating surface from J1 and H1, the coating surface from H1 immediately became soluble in the coating surface and peeled off.
Although the coating film did not peel off with the coating film from,
Fine particles were slightly peeled off from the surface, and the transparency was slightly lowered. According to these experiments, the coating of H1 was not tolerable to the living environment, but the coating of J1 was an antifogging coating that was sufficiently applicable especially in environments other than those that frequently contact water. It was revealed.

Example 2, Comparative Example 2 Coating agents J2 and H2 having the compositions shown in Table 1 were prepared. The result of the sample J2 is referred to as Example 2, and the result of the sample H2 is referred to as Comparative Example 2. All compositions (%) refer to% by weight.

[0034]

[Table 1]

The preparation of the coating agent was carried out as follows; a solvent and various raw materials were mixed at room temperature (14 ° C.), and after preliminarily stirred in a blender, an ultrahigh-pressure homogenizer (Mi) was used.
(Crofluidizer Model M-110EH, manufactured by Mizuho Industry Co., Ltd.) at an operating pressure of 1,000 kg / cm ² once to obtain a highly viscous dispersion J2 having a white color and high transparency. A white dispersion H2 was obtained.

Each dispersion was applied to a commercially available OHP sheet (made of polyethylene terephthalate) to a thickness of about 1 mm using an applicator, and dried at 50 ° C. to perform surface coating. J2 was a transparent coating film, and H2 was a translucent coating film with a slight white tint. In repeated adhesive strength tests using cellophane tape, both coatings were PET
It was not peeled off from the film at all, indicating that it had an adhesive strength that could withstand practical use. Furthermore, when the coating surfaces of the two samples were rubbed with nails in water, the coating did not peel off at all in the two samples. These revealed that the surface of the coating film of J2 was a coating film having excellent water resistance. next,
As a measure of the anti-fog properties of these coating surfaces, 35
Film kept in an atmosphere of 60 ° C. and 60% RH for 1 hour.
The haze immediately after being placed in a humidity control room at 0 ° C. and 70% RH was evaluated. As a result, it was not cloudy at all in J2,
In H2, cloudiness was clearly observed. Furthermore, after the coating film of J2 was wiped twice with tissue paper twice a day in the morning and evening, and the above-described evaluation of the anti-fog property was carried out, the anti-fog effect was also confirmed. It was found that the durability of the antifogging function of the varnish was extremely high.

[0037]

According to the composition of the present invention, cellulose as an anti-fogging agent can be uniformly and firmly fixed on the surface of a substance which is easily fogged, and a long-lasting anti-fogging effect can be exhibited. it can.

[Brief description of the drawings]

Figure 1 is an explanatory view of obtaining the fraction chi _II the fraction chi _I and type II crystalline component of the cellulose I type crystal component at the wide-angle X-ray diffraction pattern.

Claims (7)

[Claims] 1. A cellulose composition for antifogging, comprising cellulose as an antifogging agent and being uniformly dispersed. 2. The cellulose has an average degree of polymerization of 100 or less, a fraction of cellulose I type crystal component of 0.1 or less, a fraction of cellulose II type crystal component of 0.4 or less, and The antifogging cellulose composition according to claim 1, wherein the diameter is 5 µm or less. 3. The antifogging cellulose composition according to claim 1, wherein the cellulose is contained in an amount of 0.1 to 10% by weight in water, an organic solvent or a mixed solvent of water and an organic solvent. . 4. The antifogging cellulose composition according to claim 3, further comprising a latex and / or a hydrophobic polymer. 5. The method according to claim 1, wherein the content of the cellulose is 5 to 70% by weight in the hydrophobic polymer resin.
Or the anti-fogging cellulose composition according to item 2. 6. An anti-fogging coating film obtained by applying and drying the anti-fogging cellulose composition according to claim 1. 7. An antifogging molded article obtained by molding the antifogging cellulose composition according to claim 1, 2, 3, 4, or 5.