JP6801311B2 - Resin composition and films and laminates made of the resin composition - Google Patents

Description

The present invention relates to a resin composition having temperature-sensitive dimming performance in which the transmission of light rays reversibly changes according to the temperature of the use environment, and a film and a laminate made of the same. The present invention also relates to a resin composition having humidity-sensitive dimming performance, in which the transmission of light rays reversibly changes according to the humidity of the usage environment, and a film and a laminate made of the same.

Traditionally, in the agricultural field, agricultural houses have been used for stable harvesting of crops throughout the year. The main performance required for agricultural greenhouses is to suppress temperature drops in winter, and greenhouse films are required to have improved transparency as well as heat retention. Particularly in recent years, the economic burden due to the soaring price of fuel required for heating and the environmental burden due to the combustion of fossil fuels have become problems, and the demand for improving the heat retention of the film is further increasing.

On the other hand, there is a problem of plant growth obstacles caused by the temperature inside the agricultural greenhouse rising too much due to the strong direct sunlight in the summer. As a measure to suppress the temperature rise in the greenhouse in summer, a film having a function of reducing the direct light and increasing the scattered light to maintain the amount of light rays is used by blending particles that scatter light rays. ..

However, in order to solve both of the above two problems, it is necessary to replace the films having different performances in the summer and the winter. Replacing the film is extremely economically burdensome, and in the current situation where the agricultural working population is declining, it is often difficult to secure the manpower required for the work.

A temperature-sensitive light control film has been proposed as a means for solving this problem. This is a film in which the light transmittance of the film changes reversibly depending on the temperature, and becomes a transparent film at a low temperature and a light scattering film at a high temperature. As a result, it is possible to keep warm in winter and suppress indoor temperature rise in summer without changing the film.

For example, a resin composition is disclosed in which two components are composed of two immiscible components, the two components have different temperature dependence of the refractive index, and the light transmittance reversibly changes with a temperature change. (See, for example, Patent Document 1). However, when viewed as a material for agricultural films, it cannot be said that the heat retention is sufficient.

It is widely known that an inorganic filler containing a hydroxyl group is blended as a method for improving the heat retention of the film, and silica, hydrotalcite, or the like is used as the inorganic filler containing a hydroxyl group. There is. However, in order to exhibit sufficient heat retention, it is necessary to add a large amount of inorganic filler, and there is a problem that the transparency of the film is lowered.

As another method for improving the heat retention, the formulation of a vinyl alcohol-based polymer has been proposed, and since the vinyl alcohol-based polymer contains a hydroxyl group, it is expected to exhibit high heat retention.

For example, a resin composition composed of a thermoplastic resin, a vinyl alcohol polymer and an antifogging agent, and an agricultural film having at least one layer composed of the resin composition are disclosed, and the film is excellent in heat retention. Is disclosed (see, for example, Patent Document 2).

However, the film of Patent Document 2 does not have temperature-sensitive dimming performance, and it is presumed that the effect of suppressing temperature rise in summer is insufficient. Further, if a vinyl alcohol-based polymer is further added to the temperature-sensitive light control film described in Patent Document 1 for the purpose of improving heat retention, there is a concern that the physical properties and transparency of the film may be deteriorated and the moldability may be deteriorated. To.

In the above-mentioned Patent Document 1, a substance suitable as a material of a resin composition having a temperature-sensitive dimming performance is shown, but a vinyl alcohol-based polymer is not described.

Humidity control is indispensable not only for comfortable living environment but also for industrial or agricultural quality control. Therefore, the development of sensors for detecting humidity has been actively carried out for a long time, and the methods include electric resistance type, hair type, dry and wet ball type, etc. According to these methods, the humidity is good. It can be grasped with high accuracy.

On the other hand, there is also a demand to grasp the humidity of the environment simply, visually, and sensuously without the need for complicated and expensive equipment, and it can be used for moisture-proof packaging and agricultural films. Humidity indicators containing humidity-sensitive cobalt compounds and organic pigments have been put into practical use as materials that can visually recognize the humidity of the usage environment, but these materials are finally used. Wastes that use heavy metals such as cobalt compounds are not preferable from the viewpoint of environmental protection.

If there is a material having humidity-sensitive dimming performance in which the light transmission property changes reversibly according to the humidity of the usage environment, the above-mentioned requirements can be satisfied, but such materials have been used so far. It has not been put into practical use.

Japanese Unexamined Patent Publication No. 2000-95957 Japanese Unexamined Patent Publication No. 2000-1439999

The present invention has been made in view of the above circumstances, and is a resin composition having temperature-sensitive dimming performance when used as a film and further having high heat retention, and a film and a laminate made of the same. Is intended to provide. Another object of the present invention is to provide a resin composition having humidity-sensitive dimming performance, in which the transmission of light rays reversibly changes according to the humidity of the usage environment, and a film and a laminate made of the same. Is what you do.

As a result of diligent studies to solve the above problems, the present inventors have found that when a specific ethylene / vinyl acetate copolymer and a specific vinyl alcohol polymer are blended in a specific ratio, the temperature-sensitive dimming performance and We have found that a resin composition that exhibits humidity-sensitive dimming performance and further has improved heat retention can be obtained, and has completed the present invention.

That is, in the present invention, the ethylene-vinyl acetate copolymer (A) having a vinyl acetate content of 5 to 50% by weight is 50 to 99% by weight, and the vinyl alcohol-based polymer (B) having an ethylene content of less than 50 mol%. ) A resin composition containing 50 to 1% by weight (the total of (A) and (B) is 100% by weight), which is an ethylene-vinyl acetate copolymer (A) and a vinyl alcohol-based polymer at 25 ° C. B) relates to a resin composition characterized in that the difference in refractive index is 0 to 0.040.

The present invention will be described in detail below.

The ethylene-vinyl acetate copolymer (A) constituting the resin composition of the present invention has a vinyl acetate content of 5 to 50% by weight, preferably 10 to 40% by weight, and more preferably 15 to 35% by weight. Is. If the vinyl acetate content is less than 5% by weight, the refractive index of the ethylene-vinyl acetate copolymer (A) becomes large, so that it exceeds the refractive index of the vinyl alcohol-based polymer (B) and the temperature-sensitive dimming performance is improved. It may be insufficient. If the vinyl acetate content exceeds 50% by weight, the thermal stability of the resin becomes insufficient, which may hinder the molding process.

The ethylene-vinyl acetate copolymer (A) can be used by mixing two or more of the above resins as long as the transparency is not significantly impaired.

Further, the ethylene-vinyl acetate copolymer (A) can be used by mixing with another thermoplastic resin as long as the transparency is not significantly impaired. The other thermoplastic resin is not particularly limited, but an olefin polymer is preferable because it has high compatibility with the ethylene-vinyl acetate copolymer. Examples of olefin-based polymers include low-density polyethylene, high-density polyethylene, ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer saponified product, ethylene / (meth) acrylic acid copolymer, and ethylene / (meth). Examples thereof include acrylic acid ester copolymers and polypropylene.

The resin composition of the present invention needs to contain a vinyl alcohol-based polymer (B). The vinyl alcohol-based polymer (B) forms a domain without being compatible with the ethylene-vinyl acetate copolymer (A), and a part of the light incident on the resin composition is scattered at the interface between the two. The degree varies depending on the difference in refractive index between the two, but the temperature dependence of the refractive index differs between the ethylene / vinyl acetate copolymer (A) and the vinyl alcohol-based polymer (B), so that when the temperature changes, The difference in refractive index between the two changes, and the degree of scattered light changes.

The vinyl alcohol-based polymer (B) constituting the resin composition of the present invention is preferably a polyvinyl alcohol resin or an ethylene / vinyl alcohol copolymer. The ethylene-vinyl alcohol copolymer may be produced by copolymerizing ethylene and a vinyl alcohol unit, or may be produced by saponifying an ethylene-vinyl acetate copolymer. When the ethylene-vinyl acetate copolymer is saponified, the degree of saponification is preferably 30 to 100 mol%, more preferably 60 to 100 mol%, and particularly preferably 80 to 100 mol%.

The vinyl alcohol-based polymer (B) constituting the resin composition of the present invention has an ethylene content of less than 50 mol%. When the ethylene content is 50 mol% or more, the heat retention property of the composition is lowered, which is not preferable.

The difference in refractive index between the ethylene-vinyl acetate copolymer (A) and the vinyl alcohol-based polymer (B) at 25 ° C. is 0 to 0.040, preferably 0.003 to 0.035. When the difference between the refractive indexes of the two is larger than 0.040, the temperature at which the change in the light transmittance of the composition can be visually recognized shifts significantly to the lower temperature side, which is the practical temperature range of 0 to 40 ° C. of the molded product. The temperature-sensitive dimming performance is not exhibited in.

Further, the glass transition point of the vinyl alcohol-based polymer (B) constituting the resin composition of the present invention is preferably 40 ° C. or higher. When the glass transition point is 40 ° C. or higher, the change in the refractive index due to the temperature of the vinyl alcohol-based polymer (B) becomes very small at 0 to 40 ° C., which is the practically assumed temperature of the resin composition of the present invention. The temperature-sensitive dimming performance is likely to be exhibited.

The vinyl alcohol-based polymer (B) constituting the resin composition of the present invention is preferably thermoplastic. Thermoplastic means that molding conditions can be set so as not to cause significant deterioration or deterioration such as gelation during thermoforming, and vinyl alcohol-based polymers such as glycerin, derivatives thereof, polyethylene glycol, and water can be set. Those to which a plasticizer is added are also included.

The blending ratio of each component constituting the resin composition of the present invention is such that the proportion of the ethylene-vinyl acetate copolymer (A) is 50 to 99% by weight and the proportion of the vinyl alcohol polymer (B) is 50 to 1% by weight. %. If the blending ratio of the vinyl alcohol-based polymer (B) is less than 1% by weight, the temperature-sensitive dimming performance and the heat-retaining property are insufficient, which is not preferable. Further, if it is blended in an amount of more than 50% by weight, the molding processability of the resin composition may be insufficient.

The resin composition of the present invention may contain an oligomer (C) having an alicyclic structure and / or an aromatic cyclic structure. Since this oligomer (C) is compatible with the ethylene-vinyl acetate copolymer (A) and changes the refractive index of the ethylene-vinyl acetate copolymer (A), the ethylene-vinyl acetate copolymer (A) And the vinyl alcohol-based polymer (B) can be easily adjusted for the difference in refractive index. Further, by blending the oligomer (C), the interlayer adhesion becomes good when the resin composition is made into a multilayer film with another olefin resin. The type of oligomer is not particularly limited, but is a group consisting of petroleum resin, terpene resin, aromatic-modified terpene resin, terpene phenol resin, rosin resin, xylene resin, alkylphenol resin and kumaron inden resin. It is preferable that it is at least one selected from.

The oligomer (C) having an alicyclic structure and / or an aromatic cyclic structure is preferably hydrogenated. Since the unsaturated bond in the structure is reduced by the hydrogenation treatment, effects such as reduction of odor, improvement of hue, and improvement of heating stability can be expected. It may be a partially hydrogenated product in which a double bond such as an aromatic ring remains partially in the molecular structure.

Further, the oligomer (C) having the alicyclic structure and / or the aromatic cyclic structure preferably has a softening point of 100 ° C. or higher. These oligomers generally have a glass transition point 40 to 50 ° C. lower than the softening point, and if the softening point is 100 ° C. or higher, the practical temperature range (0 to 40 ° C.) of the resin composition of the present invention. Has a higher glass transition point than. Therefore, in the practical temperature range, the properties of the oligomer (C) do not change, and it can be expected that stable temperature sensitivity is exhibited. Further, it is preferable because the movement to the surface of the molded product is suppressed and problems such as stickiness are less likely to occur.

Regarding the blending ratio of the oligomer (C) having the alicyclic structure and / or the aromatic cyclic structure, the refractive index adjusting effect by the addition is good and the molding processability of the resin composition is also good. It is preferably 0.1 to 30 parts by weight, more preferably 1 to 25 parts by weight, and further preferably 5 to 25 parts by weight with respect to 100 parts by weight of the composition of (B). A compatibilizer may be added to the resin composition of the present invention in order to improve the adhesiveness at the interface between the ethylene-vinyl acetate copolymer (A) and the vinyl alcohol-based polymer (B). The type of the compatibilizer is not particularly limited, and examples thereof include maleic anhydride-modified polyethylene and an ethylene / vinyl acetate copolymer saponified product having an ethylene content of 50 mol% or more.

The resin composition of the present invention may be an SP value by blending polyol (D) other than the vinyl alcohol polymer of ^9~18cal 1/2 ^{· cm -3/2,} SP value ^{10 cal 1/2 -Cm-3} / 2 or more is preferable. The vinyl alcohol polymer other than the polyol (D) is, SP value is close vinyl alcohol polymer (B) (SP ^value: 10~13cal 1/2 ^{· cm -3/2)} and is easily compatible with each other while away ethylene-vinyl acetate copolymer having an SP value of (a) (SP value: about ^8cal 1/2 ^{· cm -3/2)} and for hardly compatible with each other, the vinyl alcohol polymer (B) It only acts to change its refractive index. As a result, by blending the polyol (D) other than the vinyl alcohol-based polymer, it becomes easy to adjust the difference in refractive index between the ethylene-vinyl acetate copolymer (A) and the vinyl alcohol-based polymer (B).

The SP value of the polyol (D) other than the vinyl alcohol-based polymer is calculated based on the Fedors method. A method for calculating the SP value by the Fedors method is described in, for example, the non-patent document "Painting Research No. 152, 41-46p (2010)".

The molecular weight of the polyol (D) other than the vinyl alcohol-based polymer is not particularly limited, but the moving speed in the resin composition is high and the action on the vinyl alcohol-based polymer (B) is rapid. It is preferably 5000 g / mol or less, more preferably 50 to 3000 g / mol, and even more preferably 100 to 2000 g / mol.

The type of polyol (D) other than the vinyl alcohol-based polymer is not particularly limited, but ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, and their fatty acid esters, propylene glycol, polypropylene glycol, and these Illustrate fatty acid esters, glycerin, polyglycerin, and these fatty acid esters, sorbitol and its fatty acid esters, trimethylpropane, pentaerythritol, polyoxypropylene triol, 1,4-butanediol, 1,6-hexanediol and the like. Can be done. In particular, trimethylolpropane and diethylene glycol are preferable.

Regarding the blending ratio of the polyol (D) other than the vinyl alcohol polymer, the composition of (A) and (B) is good because the refractive index adjusting effect by the addition is good and the bleed-out to the surface of the resin composition is small. It is preferably 0.1 to 10 parts by weight, more preferably 1 to 6 parts by weight, based on 100 parts by weight of the product.

The resin composition of the present invention further contains, if necessary, an antioxidant, a stabilizer, a weather resistant agent, an ultraviolet absorber, an antistatic agent, a slip agent, an antiblocking agent, an antifogging agent, an antifog agent, and a heat insulating agent. , Plasticizers and other additives generally used for resins may be added as long as the object of the present invention is not impaired.

The resin composition of the present invention can use a method usually used for mixing resins. For example, known melting / mixing methods include extrusion kneading using a single-screw extruder and a twin-screw extruder, and roll kneading. A method can be mentioned, and it can be obtained by melt-kneading by the method.

The resin composition of the present invention can be molded and used as a film containing at least one layer of the resin composition. The form is not particularly limited, and examples thereof include a single-layer film and a multilayer film in which a transparent resin layer is arranged on one side or both sides of a layer made of the resin composition.

The transparent resin used for the transparent resin layer constituting the multilayer film is not particularly limited, but an olefin polymer is preferable because it has good transparency and moldability. Examples of olefin-based polymers include low-density polypropylene, ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer saponified product, ethylene / (meth) acrylic acid copolymer, and ethylene / (meth) acrylic acid ester. Examples include polymers and polypropylene.

The thickness of the film is not particularly limited, but the thickness of the layer made of the resin composition of the present invention is preferably 10 μm to 5 mm, more preferably 30 μm to 2 mm, and particularly preferably 50 μm to 1 mm. The film may be called a sheet depending on its thickness.

The film forming method is not particularly limited, and a known film forming method can be used. As the molding method, inflation molding method, coextrusion inflation molding method, T die molding method, coextrusion T die molding method, dry laminate molding method, extrusion laminate molding method, coextrusion laminate molding method, sand laminate molding method, calendar molding Examples thereof include a method and a compression molding method.

In addition, the resin composition of the present invention can be used as a laminate sandwiched between a pair of transparent glass plates and / or transparent resin plates.

The materials of the transparent glass plate and the transparent resin plate are not particularly limited, and commercially available glass plates, polycarbonate resin plates, acrylic resin plates and the like can be used.

Further, the form of the laminate is not particularly limited, and a transparent glass plate / resin composition / transparent glass plate, a transparent resin plate / resin composition / transparent resin plate, a transparent glass plate / resin composition / transparent resin plate, etc. The form of is illustrated. Further, other transparent resin layers may be provided between the resin composition and the transparent glass plate and between the resin composition and the transparent resin plate.

The resin composition of the present invention is most preferably used as a temperature-sensitive dimming material as an agricultural film that requires different light transmission performance in summer and winter and further requires high heat retention. It can also be suitably used as a material for housing and a material for automobiles.

Further, the resin composition of the present invention can be used as a humidity-sensitive dimming material as a packaging container in which the visibility of the contents changes depending on the humidity and the humidity inside the container can be grasped at a glance.

Since the resin composition of the present invention has a property that the light transmittance changes depending on the temperature of the environment and further has a high heat retention property, the agricultural film, the housing material, and the automobile material using the resin composition are especially in winter. It has excellent heat retention and can be expected to have the effect of suppressing temperature rise even in the summer.

Further, since the resin composition of the present invention has a property that the light transmittance changes depending on the humidity, it can be expected to be used as a moisture-proof packaging or an agricultural film using the resin composition.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.
(1) Evaluation method of physical properties The evaluation methods of each physical property are shown below.
(1-1) Light transmission A press plate having a thickness of 1 mm was used as an evaluation sample, and the sample was adjusted for 1 hour or more in a constant temperature and humidity chamber set for each measurement condition. The state adjustment was performed under five conditions of 5 ° C. × 20% Rh, 25 ° C. × 20% Rh, 45 ° C. × 20% Rh, 45 ° C. × 50% Rh, and 45 ° C. × 90% Rh. Immediately after taking out from the constant temperature and humidity chamber, the paper on which the characters were printed and the sample were arranged in parallel so that the distance between them was 7 mm. The letters on the paper were visually observed through the sample, and the light transmission was judged by the appearance. The criteria are shown below.

5: Clearly readable 4: Clearly readable but slightly hazy 3: readable 2: Can be recognized as characters but not readable 1: Not recognizable as characters 0: Opaque (1-2) Heat retention Press with a thickness of 0.15 mm Using the film as an evaluation sample, the infrared absorption spectrum was measured using an infrared spectrophotometer SpectrumOne manufactured by PerkinElmer. The infrared absorptivity of each wavelength was standardized by multiplying the brightness of blackbody radiation at 15 ° C., and integrated over a wavelength range of 400 to 2000 cm- ¹ . The percentage of the obtained energy to the total brightness of blackbody radiation was used as the heat retention index and evaluated based on the following criteria.

◯: Heat retention index 65% or more Δ: Heat retention index 55% or more and less than 65% ×: Heat retention index less than 55% (1-3) Formability A 1 mm thick press plate molded using the composition of the present invention is visually observed. However, when unevenness was observed in the light transmittance, it was evaluated as x, and when there was no unevenness, it was evaluated as ◯.
(2) Materials The materials used in Examples and Comparative Examples are as follows.
(2-1) Ethylene-vinyl acetate copolymer (A)
A-1: Ethylene-vinyl acetate copolymer (trade name) "Ultrasen 634" (manufactured by Tosoh Corporation) Vinyl acetate content 26% by weight, melt flow rate measured at 190 ° C (hereinafter, MFR) 4.3 g Refractive index 1.489 at 25 ° C for / 10 minutes
A-2: Ethylene-vinyl acetate copolymer (trade name) "Ultrasen 626" (manufactured by Tosoh Corporation) Vinyl acetate content 15% by weight, MFR 3.0 g / 10 minutes, refractive index at 25 ° C. 1.448
The refractive index was measured in accordance with the JIS K7142 A method under the conditions of 25 ° C. and 50% Rh using an Abbe refractometer NAR-1T (manufactured by Atago Co., Ltd.) using 1-bromonaphthalene as a contact liquid.
The properties of each material are summarized in Table 1.

(2-2) Vinyl alcohol polymer (B) and other materials B-1: Polyvinyl alcohol (trade name) "Poval CP-1000" (manufactured by Kuraray Co., Ltd.) Ethylene content 0 mol%, glass transition point Refractive index 1.501 at 55 ° C and 25 ° C
B-2: Ethylene vinyl alcohol copolymer (trade name) "EVAL E105B" (manufactured by Kuraray Co., Ltd.) Ethylene content 44 mol%, refractive index 1.524 at glass transition point 53 ° C and 25 ° C
B-3: Ethylene vinyl alcohol copolymer (trade name) "EVAL F171B" (manufactured by Kuraray Co., Ltd.) Ethylene content 32 mol%, refractive index at glass transition points 57 ° C and 25 ° C 1.529
B-4: Low-density polyethylene (trade name) "Petrosen 203" (manufactured by Tosoh Corporation) Ethylene content 100 mol%, refractive index at glass transition point -20 ° C and 25 ° C 1.512
B-5: Polymethyl methacrylate resin (trade name) "Parapet G1000" (manufactured by Kuraray Co., Ltd.) Refractive index 1.493 at glass transition points 100 ° C and 25 ° C
The properties of each material are summarized in Table 2.

(2-3) Oligomer (C)
C-1: Hydrogenated petroleum resin (trade name) "Alcon P100" (manufactured by Arakawa Chemical Co., Ltd.) Softening point 100 ° C
C-2: Hydrogenated terpene resin (trade name) "Clearon P100" (manufactured by Yasuhara Chemical Co., Ltd.) Softening point 100 ° C
(2-4) polyol (D) other than polyvinyl alcohol-based polymer
D-1: Trimethylolpropane (Wako Pure Chemical Industries (Ltd.)) SP value ^13.6cal 1/2 ^{· cm -3/2,} molecular weight 134 g / mol
D-2: diethylene glycol (manufactured by Wako Pure Chemical Industries, Ltd. (Ltd.)) SP value ^12.1cal 1/2 ^{· cm -3/2,} molecular weight 106g / mol
[Example 1]
90% by weight of A-1 and 10% by weight of B-1 were put into a mixer held at 200 ° C. (R-100 mixer was connected to Labplast Mill 30C-150 manufactured by Toyo Seiki Seisakusho Co., Ltd.), and the rotation speed was 30 rpm. Kneaded for 10 minutes. The kneaded resin composition was taken out while being melted and then cooled in the air. This was press-molded on a plate having a thickness of 1 mm at 180 ° C. to prepare a sample for evaluation of light transmittance and moldability. Further, it was press-molded on a plate having a thickness of 0.15 mm at 180 ° C. to prepare a sample for evaluation of heat retention.

The performance of this sample was evaluated by the methods shown in (1-1) to (1-3). The results are shown in Table 3.

[Example 2]
Samples were prepared and evaluated in the same manner as in Example 1 except that A-2 was used instead of A-1. The results are shown in Table 3.

[Example 3]
Samples were prepared and evaluated in the same manner as in Example 2 except that the compounding ratio of A-2 was changed to 70% by weight and the compounding ratio of B-1 was changed to 30% by weight. The results are shown in Table 3.

[Example 4]
Samples were prepared and evaluated in the same manner as in Example 2 except that B-2 was used instead of B-1. The results are shown in Table 3.

[Example 5]
Samples were prepared and evaluated in the same manner as in Example 2 except that B-3 was used instead of B-1. The results are shown in Table 3.

[Example 6]
Preparation and evaluation of a sample by the same method as in Example 1 except that 20 parts by weight of C-1 was mixed and kneaded with respect to 100 parts by weight of a mixture consisting of 90% by weight of A-2 and 10% by weight of B-2. Was done. The results are shown in Table 3.

[Example 7]
Samples were prepared and evaluated in the same manner as in Example 6 except that C-2 was used instead of C-1. The results are shown in Table 3.

[Example 8]
Sample preparation and evaluation in the same manner as in Example 1 except that 5 parts by weight of D-1 was mixed with 100 parts by weight of the mixture consisting of 90% by weight of A-2 and 10% by weight of B-2 and kneaded. Was done. The results are shown in Table 3.

[Example 9]
Samples were prepared and evaluated in the same manner as in Example 8 except that D-2 was used instead of D-1. The results are shown in Table 3.

[Comparative Example 1]
Samples were prepared and evaluated in the same manner as in Example 2 except that the compounding ratio of A-2 was 100% by weight and B-1 was not compounded. The results are shown in Table 4. There was no difference in light transmission between 5 ° C and 45 ° C, and no temperature-sensitive dimming performance was observed. In addition, humidity-sensitive dimming performance was not observed. Furthermore, the heat retention was low.

[Comparative Example 2]
Samples were prepared and evaluated in the same manner as in Example 2 except that the compounding ratio of A-2 was set to 30% by weight and the compounding ratio of B-1 was changed to 70% by weight. The results are shown in Table 4. Moldability deteriorated.

[Comparative Example 3]
Samples were prepared and evaluated in the same manner as in Example 2 except that B-4 was used instead of B-1. The results are shown in Table 4. There was no difference in light transmission between 5 ° C and 45 ° C, and no temperature-sensitive dimming performance was observed. In addition, humidity-sensitive dimming performance was not observed. Furthermore, the heat retention was low.

[Comparative Example 4]
Samples were prepared and evaluated in the same manner as in Example 1 except that B-5 was used instead of B-1. The results are shown in Table 4. The heat retention was low. Moreover, the temperature-sensitive dimming performance at 25 ° C. or lower was not observed. Furthermore, no humidity-sensitive dimming performance was observed.

Claims (6)

Ethylene-vinyl acetate copolymer (A) 50 to 99% by weight having a vinyl acetate content of 5 to 50% by weight, and vinyl alcohol polymer (B) having an ethylene content of less than 50 mol% by 50 to 1 weight. % (The total of (A) and (B) is 100% by weight), and the refractive index of the ethylene-vinyl acetate copolymer (A) and the vinyl alcohol-based polymer (B) at 25 ° C. difference from 0 to 0.040 der of is, the sum of the ethylene-vinyl acetate copolymer (a) and 100 parts by weight of the resin composition containing a vinyl alcohol polymer (B) and ((a) (B) is per 100 parts by weight), more alicyclic structure and / or aromatic resin composition characterized that you containing 0.1-30 parts by weight of oligomer (C) having a cyclic structure. The resin composition according to claim 1, wherein the vinyl alcohol-based polymer (B) is a polyvinyl alcohol resin or an ethylene / vinyl alcohol copolymer. The resin composition according to claim 1 or 2, wherein the vinyl alcohol-based polymer (B) has a glass transition point of 40 ° C. or higher. The SP value is further increased with respect to 100 parts by weight of the resin composition containing the ethylene-vinyl acetate copolymer (A) and the vinyl alcohol-based polymer (B) (the total of (A) and (B) is 100 parts by weight) . 9~18cal ^1/2 · ^{cm -3/2} and a vinyl alcohol polymer other than polyol (D) to any one of claims 1 to 3 any one, characterized in that it contains 0.1 to 10 parts by weight The resin composition described. A film comprising at least one layer made of the resin composition according to any one of claims 1 to 4 . A laminate according to any one of claims 1 to 4, wherein the resin composition is sandwiched between a pair of transparent glass plates and / or transparent resin plates.