JP7397751B2 - container with contents - Google Patents

Description

The present invention relates to a container containing contents , and particularly to a container containing contents suitable for storing highly viscous contents and paste-like or gel-like contents containing solid components.

In recent years, packaging containers have been made multifunctional from various viewpoints such as preserving freshness, reducing food loss, and promoting the 3Rs (reduce, reuse, recycle).
For example, Patent Document 1 discloses a liquid-repellent article having a liquid-repellent surface layer containing fluororesin particles on the surface of a base material. The liquid-repellent surface layer disclosed in Patent Document 1 has a sliding angle of 30° or less for various liquids such as sauce and soy sauce, and has high liquid removal performance. By using the liquid-repellent article as a container body, even when the remaining amount is low, the contents can be easily discharged from the container body by, for example, tilting the container body. Further, by using the liquid-repellent article as a discharge port, a cap, etc., it is possible to prevent the contents from solidifying while adhering to the back surface of the discharge port or the cap. Therefore, in addition to reducing food loss, there are advantages in that by lightly washing the container with water after use, the contents adhering to the inner surface of the container can be easily removed, making it easier to promote recycling.

JP 2019-189773 Publication

However, the liquid-repellent surface layer has a problem in that the components, surface shape, etc. of the liquid-repellent surface layer must be changed depending on the contents. In addition, the liquid-repellent surface layer is effective for liquid products with relatively good fluidity, such as sauce and soy sauce, but for example, it is effective for liquid products with relatively good fluidity, such as sauces and soy sauce. It has been difficult to maintain sufficient removal performance for tubed foods such as tubed seasonings, and articles with low fluidity such as paste-like or cream-like products such as toothpaste and facial cleansing foam. Therefore, when the above-mentioned liquid-repellent article is used as a container for storing articles with higher viscosity or articles with a high content of solid components, the contents may not be discharged when the remaining amount becomes low. It has been difficult to sufficiently prevent the contents from adhering to the inner surface of the container.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a container containing contents that can easily remove the contents from its contact surface even when storing articles with low fluidity as contents.

The present invention is a container containing contents,
A base material as a constituent material of the container;
a hydrophilic layer having a contact angle with water of 10° or less on the surface in contact with the contents of the base material ;
Equipped with
The hydrophilic layer is a polymer brush layer in which a plurality of polymer chains are provided in a brush shape on the contact surface,
The base material is provided with the hydrophilic layer on the contact surface via a primer layer,
The base material is a plastic base material, the primer layer is a silica deposited layer, and the hydrophilic layer is an organosilicon compound layer,
The content is a container containing a content, which is an article having a moisture content of 33% or more .

According to the container containing contents according to the present invention, a hydrophilic layer is provided on the surface of the base material that is a constituent material that comes into contact with the contents. The hydrophilic layer has a contact angle with water of 10° or less and has extremely high wettability with water. Therefore, when contents containing moisture are stored in the container, the moisture in the contents wets and spreads over the hydrophilic layer, and the water is retained in the hydrophilic layer to form a layer of water (water-retaining layer) on the contact surface. It is presumed that this can be done. This layer of water prevents the contents from coming into direct contact with the base material, allowing the contents to float on the layer of water. As a result, even if the viscosity of the contents is high and the fluidity of the contents themselves is low, the contents will slide down by tilting the base material, etc., making it possible to easily remove the contents from the contact surface of the base material. . Therefore, by storing contents containing moisture in the container, it is possible to prevent the contents from adhering to the inner surface of the container. Further, even when the remaining amount is low, the contents can be easily discharged from the container, making it easy to use up the contents to the end.

Furthermore, according to the container, it is presumed that the water layer can be formed by lightly rinsing the contents with water after use. Therefore, even if the contents adhere to the inside of the container and solidify, the water layer lifts the contents from the surface of the base material, making it possible to easily remove them. This effect can be obtained regardless of the water content of the contents. For example, when containing articles with high viscosity or articles containing many solid components, these contents adhere to the inner surface of the used container, making it difficult to recycle the used container. However, even if such an item is stored in the container, the contents attached to the inner surface can be removed by washing it lightly with water after use, so recycling of used containers can be promoted. becomes easier.

As described above, according to the present invention, it is possible to provide a container in which the contents can be easily removed from the contact surface even when an article with low fluidity is stored as the contents.

1 is a diagram for explaining the layer structure of a container according to an embodiment of the present invention, (a) is a schematic diagram thereof, and (b) is a schematic diagram showing a structure of a polymer brush layer as an example of a hydrophilic layer. be. 1 is a diagram showing a specific configuration example of a container according to an embodiment of the present invention, in which (a) is a schematic diagram showing a squeeze container (tube container) as an example of the container, and (b) is a diagram showing the material of the base material. FIG. 2 is a schematic diagram for explaining the layer structure when a primer layer is provided according to the conditions. It is a schematic diagram for demonstrating the effect|action by the polymer brush layer shown in FIG.1(b).

Embodiments of the container according to the present invention will be described below with reference to the drawings. The container of this embodiment can contain various contents, and as shown in FIG. , is characterized by comprising a hydrophilic layer 20 (superhydrophilic layer) having a contact angle θ with water of 10° or less. Note that FIG. 1(a) is a schematic diagram showing the layer structure, and does not represent the thickness of each layer. Moreover, the thickness of each layer can be appropriately set to an appropriate thickness (the same applies to FIG. 2(b)). Below, the container and contents will be explained first, and then the base material 10 and the hydrophilic layer 20 will be explained.

(1) Container As described above, the base material 10 is used as a component of a container. In the present invention, containers refer to various packaging containers. A packaging container refers to a container for packaging and accommodating various items such as foods, medicines, cosmetics, and daily necessities, and can be any container that has a surface that can come into contact with the contents (this is referred to as a contact surface in the present invention). , it may be of any form (shape, material, etc.).

The container may be, for example, in addition to the squeeze container 100 (tube container) shown in FIG. No question. In addition, containers equipped with a mechanism for discharging the contents such as a pump mechanism or a spray mechanism, containers equipped with measuring means such as a measuring cup for measuring the contents, or containers that hold the contents in a predetermined position. It may also be a container equipped with various applicators for application. Furthermore, a bag-like soft packaging such as a pouch container may be used, and the specific form of the container is not particularly limited as long as the base material 10 provided with the hydrophilic layer 20 is used as a constituent material of at least a part of the container. It's not something that can be done.

(2) Contents The contents contained in the container are not particularly limited, and may include various items such as the above-mentioned foods, medicines, cosmetics, and daily necessities. Although the state (liquid, solid, etc.) and components of these articles are not particularly limited, they are preferably articles containing moisture. If the contents containing moisture are stored in the container, the action of the hydrophilic layer 20 described later will remove the contents adhering to the contact surface of the base material 10 when using the contents, such as tilting the base material 10. The movement allows the contents to slide out.

In particular, the moisture content of the contents is preferably 33% or more, more preferably 40% or more, even more preferably 60% or more, and even more preferably 70% or more. This is because the content with a higher moisture content has better sliding properties on the base material 10.

However, the moisture content referred to herein refers to a value measured by the Karl Fischer method, and particularly refers to a value measured by a coulometric titration method.

Moreover, as described later, according to the container, even when the viscosity of the contents is 100,000 mPa·s or more, the ability to slide off the base material 10 can be maintained.
However, the viscosity here refers to a value measured at room temperature (20° C.) using a rotational viscometer in accordance with JIS Z 8803:2011.

For example, articles with a water content of 33% or more and a viscosity of 100,000 mPa·s often have a gel-like, paste-like, or cream-like appearance. Examples of such products include tubed foods such as tubed seasonings containing finely chopped solid ingredients such as ginger and wasabi, and paste-like or cream-like products such as toothpaste and facial cleansing foam. . Although these articles have fluidity, their fluidity is low. However, according to the present invention, even when such an article is used as the content, it is possible to maintain the sliding property on the base material 10, and it is possible to remove the content from the contact surface of the base material 10. It is possible.

(3) Base material 10
Next, the base material 10 will be explained. The base material 10 is a component that constitutes a container, and can be made of various materials used as various packaging container materials, such as plastic, glass, paper, metal, and ceramics. Further, although FIG. 1(a) shows a case where the base material 10 has a single layer structure, the base material 10 may have a multilayer structure, and may be a composite material that combines layers of different materials. There may be. However, the base material 10 is required to be able to provide the hydrophilic layer 20 directly or via a primer layer 30 (see FIG. 2(b)), which will be described later, on the surface in contact with the contents. Note that the primer layer 30 will be described later.

The base material 10 also has various functions required for the container (squeezable property (flexibility), self-supporting property (rigidity), content visibility (transparency), quality retention performance (oxygen barrier property, moisture proofing property, Depending on the heat resistance, etc.) and the shape, an appropriate material can be used as appropriate. For example, when the base material 10 is a plastic base material, LDPE (low density polyethylene), HDPE (high density polyethylene), EVA (ethylene vinyl acetate copolymer), PP (polypropylene (PP homopolymer), random copolymer Coalescence, block copolymer)), PET (polyethylene terephthalate), PS (polystyrene), acrylic resin, polysulfone resin, polycarbonate resin, ABS resin (acrylonitrile-butadiene-styrene), AS resin (acrylonitrile-styrene), etc. The containers can be sheet-molded containers, blow-molded containers, injection-molded containers, extruded laminate products, foamed products, etc. made of these materials.

Furthermore, in the present invention, at least a portion of the container may be constituted by this base material 10. For example, the squeeze container 100 shown in FIG. 2(a) includes a container body 50 that accommodates the contents, and a cap body 60 that is removably attached to the mouth portion 50a of the container body 50. The base material 10 may be a constituent material of the container body 50 or a constituent material of the cap body 60, and both may be composed of the base material 10. However, the container body 50 and the cap body 60 may be made of different materials.

Further, depending on the container, for example, in addition to the container body or the cap, various members such as the above-mentioned pump mechanism, spray mechanism, applicator, etc. may be constituted by the base material 10. Further, the base material 10 may constitute only a part of the container body, the cap body, and other members instead of the entirety thereof.

(4) Hydrophilic layer 20
Next, the hydrophilic layer 20 will be explained. The hydrophilic layer 20 has a contact angle θ with respect to water of 10° or less, and is provided on the surface of the base material 10 that comes into contact with the contents. Here, it is assumed that the hydrophilic layer 20 is provided on the outermost surface of the contact surface of the base material 10. In addition, the contact angle θ with respect to water is defined as when a water droplet W made of purified water (ion-exchanged water) is brought into contact with the surface of the hydrophilic layer 20 and is deposited on the surface of the hydrophilic layer 20. When a tangent is drawn to a curved surface, this is the angle formed between this tangent and the surface of the hydrophilic layer 20. The contact angle θ can be measured by the θ/2 method (A half-angle method) using a contact angle meter CA-D manufactured by Kyowa Interface Science Co., Ltd.

As described above, the hydrophilic layer 20 has a small contact angle θ with respect to water, and the wettability of the surface with respect to water is extremely high. Therefore, when contents containing moisture are stored in the container, the moisture in the contents wets and spreads on the hydrophilic layer 20, water is retained in the hydrophilic layer 20, and a layer of water (water-retaining layer) is formed on the contact surface. It is presumed that it is possible to form a

The hydrophilic layer 20 may be a layer having a contact angle θ of 10° or less with respect to water, and the smaller the value of the contact angle θ, the higher the wettability with respect to water. From this point of view, the contact angle θ is more preferably less than 10°, and even more preferably 9.5° or less.

The hydrophilic layer 20 is preferably a thin film containing a compound having a hydrophilic group such as a hydroxyl group (-OH), and particularly preferably a thin film containing an organosilicon compound containing a hydrophilic group. As such a hydrophilic layer 20, for example, a self-assembled film made of an organosilicon compound containing a hydrophilic group, or a plurality of polymer chains 21 (FIG. 1(b)) provided in a brush shape on the contact surface. It is preferable that the polymer brush layer is Note that the polymer brush layer is a type of self-assembled film in a broad sense.

When the hydrophilic layer 20 is composed of a polymer brush layer, for example, as shown in FIG. The polymer chain 21 has a special structure in which a plurality of monomer units 21b constituting the polymer chain 21 are bonded to the terminal group 21a to be bonded, and the polymer chain 21 is provided on the contact surface like the bristles of a brush. In addition, in order to clearly show the structure of the polymer brush layer in FIG. 1(b), the terminal group 21a and the monomer unit 21b are each schematically shown in a round shape. Moreover, the number of illustrated monomer units 21b does not indicate the degree of polymerization or the number of hydrophilic groups.

For the hydrophilic layer 20, various hydrophilic coating agents can be used as long as they exhibit hydrophilicity with a contact angle θ with water of 10° or less. For example, it is possible to use a hydrophilic coating agent (polymer brush forming agent) that contains a polymer containing an alkoxysilyl group, which is a type of organosilicon compound, and forms a polymer brush by bonding to the surface of the base material 10 through silanol groups. . Alternatively, the polymer brush layer may be formed by polycondensing an organic silane compound or the like on the base material 10.

(5) Primer layer 30
Next, the primer layer 30 shown in FIG. 2(b) will be explained. A primer layer 30 may be provided on the contact surface of the base material 10 in order to obtain adhesion between the base material 10 and the hydrophilic layer 20 or to improve the adhesion between the base material 10 and the hydrophilic layer 20. . In this way, the primer layer 30 is a layer provided between the base material 10 and the hydrophilic layer 20.

For example, when an organosilicon compound layer (including a polymer brush layer) is provided on the surface of the substrate 10 as the hydrophilic layer 20, the organosilicon compound layer is chemically bonded to the surface of the substrate 10 mainly through silanol groups. If the hydroxyl group is present on the surface of the base material 10, the polymer brush layer is tightly fixed to the base material 10. For example, if the base material 10 is a glass base material, it is possible to obtain a polymer brush layer that firmly adheres to the surface of the base material 10 without providing the primer layer 30. However, if the base material 10 does not have sufficient hydroxy groups on its surface, such as plastic or metal, it is necessary to provide a primer layer 30 on the surface of the base material 10 to introduce hydroxy groups onto the surface of the base material 10.

As such a primer layer 30, for example, a silica vapor-deposited layer can be mentioned. The silica vapor deposition layer can be formed on the surface of the base material 10 by a physical vapor deposition method (PVD) such as a vacuum evaporation method or a sputtering method, or a chemical vapor deposition method (CVD). However, as the method for forming the silica vapor-deposited layer, an appropriate method can be adopted as appropriate depending on the material of the base material 10 and the like.

The silica vapor-deposited layer can firmly adhere the base material 10 and the hydrophilic layer 20 when the organic silicon compound layer including the polymer brush layer is provided as the hydrophilic layer 20 on the plastic base material 10 or the like.

Next, with reference to FIG. 3, the effect when moisture comes into contact with the hydrophilic layer 20 in the container of the present embodiment described above will be described. The hydrophilic layer 20 shown in FIG. 3 is a polymer brush layer. In FIG. 3, the right side shows a state in which the hydrophilic layer 20 and water are not in contact with each other, and the left side shows a state in which water droplets W are in contact with the hydrophilic layer 20.

As shown on the right side of FIG. 3, when the hydrophilic layer 20 and water are in a non-contact state, each polymer chain 21 constituting the polymer brush layer is in a dry state (21 dry). On the other hand, as shown on the left side in FIG. 3, when a water droplet W comes into contact with the hydrophilic layer 20, the water droplet W immediately wets and spreads within the hydrophilic layer 20. At this time, the hydrophilic groups of the polymer chains 21 and water form hydrogen bonds, and each polymer chain 21 contains water and becomes a swollen state (21 wet), and as described above, the swollen polymer chains 21 wet are placed on the base material 10. A layer of water is formed by retaining water.

Here, components other than water, such as components that tend to adhere to the base material 10 such as solid components and oil (hydrophobic components) included in the contents, cannot enter into the polymer brush layer. Therefore, the solid components S appear to be floating on this water layer. Not limited to the polymer brush layer shown in FIG. 1(b) and FIG. 3, by providing a hydrophilic layer 20 with a contact angle θ of 10° or less with water on the surface of the base material 10 in contact with the contents, the contact surface A layer of water as described above can be formed by bringing water into contact with the material.

Therefore, if a content with a high moisture content is stored in the container (for example, the squeeze container 100), a layer of water can be formed by the water contained in the content, and the content (especially solid components and oil content) ) can be made to float on a layer of water. As a result, even if the viscosity of the contents is high and the fluidity of the contents themselves is low, the contents may slide off the base material 10 by tilting the base material 10 (container, etc.), and the contents may fall from the contact surface of the base material 10. can be easily removed. Therefore, adhesion of the contents to the inner surface of the container can be suppressed. Further, even when the remaining amount is low, the contents can be easily discharged from the container, making it easy to use up the contents to the end.

Further, according to the container, the water layer can be formed by lightly rinsing the contents with water after using the contents. Therefore, even if the contents do not contain moisture or have a low moisture content and have adhered to the inside of the container and solidified, if the hydrophilic layer 20 is provided at the adhesion site, it can be washed with water after use. By doing so, the contents can be lifted off the surface of the base material 10 and can be easily removed. For example, when containing articles with high viscosity or articles containing many solid components, these contents adhere to the inner surface of the used container, making it difficult to recycle the used container. However, even if such an item is stored in the container, the contents attached to the inner surface can be removed by washing it lightly with water after use, so recycling of used containers can be promoted. becomes easier.

It should be noted that the present invention is not limited to the embodiments described above, and can of course be modified as appropriate without departing from the spirit of the present invention.

Next, the container according to the present invention will be described in more detail with reference to Examples and Comparative Examples. However, it goes without saying that the present invention is not limited to the following examples.

[Example]
As an example, a PET plate with a water contact angle θ of 77° is used as the base material 10, a silica vapor deposited layer is provided as a primer layer 30 on the surface of the PET plate, and a silica vapor deposited layer is provided on the primer layer 30 with a water contact angle θ of 9°. A hydrophilic layer 20 was provided.

The silica vapor deposited layer (primer layer 30) is formed by placing the base material 10 in a vacuum container and applying a gas capable of forming a silica film, such as tetramethoxysilane (alkoxysilane), hexamethyldisilazane, hexamethyldisiloxane, to the vacuum container. A silica vapor deposited layer was formed on the surface of the base material 10 by a general plasma CVD method.

The hydrophilic layer 20 was formed by applying a hydrophilic coating agent (polymer brush forming agent) on the silica vapor deposited layer by dip coating and drying at 65° C. for 1 hour. As the hydrophilic coating agent, a superhydrophilic coating material (LAMBIC-771W) manufactured by Osaka Organic Chemical Industry Co., Ltd. diluted five times with ion-exchanged water was used. The hydrophilic layer 20 thus formed has a silanol group at one end, and the polymer chain 21 formed by polymerizing the hydrophilic monomer is brushed onto the surface of the base material 10 (specifically, the surface of the primer layer 30). It becomes a polymer brush layer provided in a shape.

[Comparative example]
As Comparative Example 1, a PET plate having a contact angle θ with respect to water of 77° was prepared, similar to the base material 10 used in Examples. Furthermore, as Comparative Example 2, a PP plate having a contact angle θ of 96° with respect to water was prepared. Comparative Examples 1 and 2 were composed of only the base material 10.

[evaluation]
1. Evaluation method Using each plate prepared in the above example, comparative example 1, and comparative example 2 as a sample plate, eight types of content samples with a viscosity of 100,000 mPa・s or more and different moisture contents were prepared. The sliding angle of the samples (Sample 1 to Sample 8) was evaluated. In the evaluation, first, a sample plate was placed horizontally, and 0.2 g of the content sample was placed on the sample plate. Then, the sample plate was gradually tilted from the horizontal state, and the inclination angle when the sample slid down from the sample plate was compared to perform evaluation.

(1) Sample The following samples were prepared.
[Moisture content 70% or more] (1 type)
Sample 1: Seasoning in a tube manufactured by House Foods Co., Ltd. (Momiji oroshi)
[Moisture content 60% or more and less than 70%] (2 types)
Sample 2: Tube seasoning (ginger) manufactured by House Foods Co., Ltd.
Sample 3: Seasoning in a tube manufactured by House Foods Co., Ltd. (Yuzu pepper)
[Moisture content 33% or more and less than 60%]
Sample 4: Mayonnaise made by Kewpie Co., Ltd. Sample 5: Seasoning in a tube made by House Foods Co., Ltd. (grated raw garlic)
Sample 6: Seasoning in a tube manufactured by House Foods Co., Ltd. (grated fresh wasabi)
Sample 7: Facial cleanser manufactured by Kao Corporation (Biore Skin Care Facial Cleanser Moisture B)
[Moisture content less than 33%]
Sample 8: Seasoning in a tube manufactured by House Foods Co., Ltd. (Neri Japanese mustard)

(2) Moisture Content Measuring Method The moisture content of each sample was measured by coulometric titration using a Karl Fischer moisture meter (MKC-610) manufactured by Kyoto Electronics Industry Co., Ltd. The measured moisture content of each sample is shown in Tables 1 to 3.

(3) Viscosity The viscosity of each sample was measured at room temperature (20°C) in accordance with JIS Z 8803:2011 using a Brookfield rotational viscometer (DV1M) manufactured by Brookfield Engineering. The measured viscosity values of each sample are shown in Tables 1 to 3.

(4) Sliding property evaluation According to the above method, a sliding test was performed on the above samples 1 to 8 on the sample plates of Examples and Comparative Examples 1 and 2, and the inclination angle of the sample plate was set to 15°, 30°, and 45°. ° and 90°, evaluation was made based on the following criteria.
○: The sample on the sample plate slipped down (moved significantly).
Δ: The sample on the sample plate moved 1 to 2 mm from the initial position.
×: The sample on the sample plate did not move.

2. Evaluation Results The evaluation results of Example 1, Comparative Example 1, and Comparative Example 2 are shown in Table 1, Table 2, and Table 3, respectively.
From Table 1, it can be seen that by providing the hydrophilic layer 20 with a contact angle θ of 9° to water on a PET plate with a contact angle θ of 77° as in Example 1, the viscosity can be increased to 100,000 mPa·s or more. Even if the fluidity is high and the fluidity is low, for Samples 1 to 7 with a water content of 33% or more, by tilting the base material 10 to 45 degrees, it is possible to slide down the base material 10 even if it is not possible to completely slide the sample down. It was confirmed that it can be slid.

In particular, Samples 1 to 3 have a moisture content of 60% or more, and it is presumed that the moisture contained in the samples easily forms the water layer (see Figure 3). It was confirmed that by tilting the base material 10 up to 30 degrees from the horizontal state, the sample on the base material 10 began to move downward in the tilt direction or slipped down. In addition, by tilting the sample plate up to 45 degrees from the horizontal state, Samples 4 to 7 with a moisture content of 33% or more begin to move downward in the sample inclination direction on the base material 10, or slide down, and the moisture content It was confirmed that Samples 4 to 6, which had a rate of 40% or more, would slide off the sample plate if the sample plate was tilted to 90°.

On the other hand, the moisture content of Sample 8 was 32.7%, which was low compared to the other samples, and the moisture contained in Sample 8 alone could not provide sufficient sliding properties. However, in all of the samples in Examples, the sample on the sample plate could be easily removed by gently rinsing with running water while the sample plate was tilted.

From the above, if a container is constituted by a base material 10 having a hydrophilic layer 20 with a water contact angle θ of 9° on the surface in contact with the contents, and the contents with a moisture content of 33% or more are stored in the container, It is presumed that the moisture in the contents wets and spreads over the hydrophilic layer 20, forming a layer of water on the contact surface. This layer of water prevents the contents from coming into direct contact with the base material, allowing the contents to float on the layer of water. As a result, even when the viscosity is as high as 100,000 mPa・s or more and the fluidity is low, as in Samples 1 to 7 above, the contents can be slipped off by tilting the container, and the contents can be spilled onto the inner surface of the container. Adhesion can be suppressed, and the contents can be easily discharged from the container even when the remaining amount is low. In particular, Sample 2, Sample 5, and Sample 6 had extremely high viscosities of 400,000 mPa·s or more, but it was confirmed that these also had sliding properties.

On the other hand, referring to Table 2, the base material 10 of Comparative Example 1 uses the same PET plate as the base material of Example 1, but when compared with the results of Example 1 shown in Table 1, the difference is obvious. It is said that In Example 1, as described above, for Samples 1 to 3 with a moisture content of 60% or more, the sample on the base material 10 was moved downward in the tilt direction by tilting the sample plate up to 30° from the horizontal state. However, in Comparative Example 1, Sample 2 did not move at all even when the sample plate was set at 90°, and Samples 1 and 3 finally moved in the tilt direction by setting the sample plate at 90°. It began to move downwards or slid down. However, Sample 2 did not move at all even when the sample plate was set at 90°, probably because its viscosity was as high as 541,800 mPa·s.

Next, referring to Table 3, the base material 10 of Comparative Example 2 uses a PP plate having a larger contact angle θ with respect to water than those of Example 1 and Comparative Example 1. Comparative Example 2 also shows a clear difference when compared with the results of Example 1 shown in Table 1. On the other hand, when compared with Comparative Example 1, it is confirmed that Comparative Example 2 has smaller sliding angles for Samples 1 and 3. However, in both Comparative Example 1 and Comparative Example 2, it is not possible to retain moisture on the surface of the base material 10 and form the water layer, so the frictional force that acts between the surface of the base material 10 and the sample It is presumed that Comparative Example 2 had a smaller sliding angle than Samples 1 and 3 due to the difference in the following.

10: Base material 20: Hydrophilic layer 30: Primer layer 50: Container body 50a: Mouth part 60: Cap body 100: Container (squeeze container)

Claims (1)

A container with contents,
A base material as a constituent material of the container;
a hydrophilic layer having a contact angle with water of 10° or less on the surface in contact with the contents of the base material;
Equipped with
The hydrophilic layer is a polymer brush layer in which a plurality of polymer chains are provided in a brush shape on the contact surface,
The base material is provided with the hydrophilic layer on the contact surface via a primer layer,
The base material is a plastic base material, the primer layer is a silica deposited layer, and the hydrophilic layer is an organosilicon compound layer,
A container containing a content, wherein the content is an article having a moisture content of 33% or more.

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