JP2003089170A - Base material for packaging and container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base material for packaging which improves the water resistance and heat resistance of a container formed from the base material based on a fiber structure base material and the container. SOLUTION: The fiber structure base material is impregnated with an impregnation liquid containing a polyisocyanate as a main component. The fiber structure base material is additionally impregnated with a thermosetting resin having unsaturated bonds, or a coat of the thermosetting resin is formed at least on one surface of the base material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laundry product, a laundry softener, a shampoo, a hair rinse and other toiletry products, and packaging for storing or storing beverages, foods, cosmetics, etc. The present invention relates to a base material and a container using the base material for packaging as a container material.

[0002]

2. Description of the Related Art Conventionally, as containers for storing toiletries, foods, etc., which require water resistance, steam resistance, hot water resistance, etc., plastics, metals, or those Many are made of laminated materials.

However, in recent years, environmental problems have become serious, and in the field of containers and packaging materials, active efforts have been made to save resources and to easily dispose of used containers. Other than that, the ratio of using materials having excellent cycleability, incineration property, etc. is increasing more and more.

Further, in consideration of the situation such as the separation and collection of used containers, the promotion of treatment of waste containers according to the constituent materials, and the imposition under the Containers and Packaging Recycling Law, resource saving of containers and packaging materials and simplification of the structure. It is becoming more and more popular.

Under such social conditions, attempts have been made to reduce the use of plastics and metal materials as much as possible in containers and packaging materials, and further, the reduction of various strengths due to the reduction of plastics and metal materials. Many proposals have been made to ensure that even a fibrous structure base material such as paper excellent in recyclability and easy incineration can be secured.

However, in a container mainly composed of a fibrous structure base material such as paper, for example, a paper container, the strength of the fibrous structure base material itself is lower than that of a plastic container or a metal container, and the container is easily deformed. Further, the strength of the paper container is remarkably reduced when it is wet with water. Therefore, when it is used in containers that are loaded with a large weight or used in environments around water or high humidity, such as packaging containers and beverage containers that store heavy items, and containers that store toiletry products, etc. It becomes impossible to sufficiently maintain the strength of the container.

In order to cope with such a situation, in order to improve the physical properties of the fiber structure base material such as paper constituting the container,
BACKGROUND ART Resins are impregnated or coated on a fiber structure base material. Among them, a fiber structure substrate in which a fiber structure substrate is impregnated with a polyisocyanate resin has been proposed. This impregnated fibrous structure base material has better permeability into the resin than conventional impregnating agents such as wax.
Therefore, the water content in the fiber structure base material, or the hydroxyl group of the cellulose in the fiber structure base material and the isocyanate group are relatively efficiently thermally reacted, a urethane bond, a urea bond,
Hydrogen bonds are generated. It has been found that these bonds can impart a considerable water resistance.

However, in a 1: 1 thermal reaction between the isocyanate groups in the polyisocyanate-based resin and the water in the fiber structure base material, the reactivity is high, but the water content is usually higher than that required for this reaction. Since it is present in fibrous structure substrates such as paper, it is necessary to impregnate a larger amount of polyisocyanate resin to react with water in order to obtain sufficient wet strength as a packaging substrate. Further, in the reaction system of the isocyanate group in the resin and the hydroxyl group of cellulose in the fiber structure base material, there is a problem such as poor reactivity. Further, the impregnated fibrous structure base material impregnated with the polyisocyanate resin is poor in water repellency, and water absorption from the front and back surfaces lowers the wet strength, resulting in a decrease in strength.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a packaging substrate mainly composed of a fiber structure substrate and a container comprising the packaging substrate as a container material, It is an object of the present invention to provide a packaging base material and a container having improved water resistance and heat resistance.

[0010]

The present invention achieves the above object. According to the invention of claim 1, a fibrous structure base material is impregnated with an impregnating liquid mainly composed of polyisocyanate. In addition, the fibrous structure base material is further impregnated with a thermosetting resin containing an unsaturated bond, or at least one surface of the fibrous structure base material has a surface coating made of a thermosetting resin containing an unsaturated bond. The packaging substrate is further provided.

Further, the packaging substrate according to claim 2 is the same as the packaging substrate according to claim 1, wherein the surface coating made of a thermosetting resin containing an unsaturated bond is provided on both sides of the fiber structure substrate. It is provided in.

Furthermore, the packaging substrate according to claim 3 is the packaging substrate according to claim 1 or 2, wherein the thermosetting resin is an acrylic ester resin containing an unsaturated bond. It is characterized by

Further, in the invention according to claim 4, the fibrous structure base material is impregnated with an impregnating liquid mainly containing polyisocyanate, and the fibrous structure base material is thermoset containing an unsaturated bond. Is further impregnated with a thermosetting resin, or a packaging base material in which a surface coating made of a thermosetting resin containing an unsaturated bond is further provided on at least one side of a fiber structure base material is used as a container material. It is a container characterized by that.

Furthermore, the container described in claim 5 is characterized in that, in the container described in claim 4, a thermoplastic resin layer is provided on the inner surface of the packaging base material constituting the container. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in more detail below.

FIG. 1 shows a schematic sectional structure of a packaging substrate 1 according to an embodiment of the present invention. Further, FIG. 2 shows a schematic sectional configuration of a packaging base material 21 according to another embodiment of the present invention.

In the packaging substrate 1 shown in FIG. 1, the fiber structure substrate 2 constituting the skeleton is impregnated with an impregnating liquid mainly containing polyisocyanate, and at the same time, the fiber structure substrate 2 is formed.
Is further impregnated with a thermosetting resin containing an unsaturated bond. In addition, in the packaging base material 21 shown in FIG. 2, the fibrous structure base material 2 constituting the skeleton is impregnated with an impregnating liquid mainly composed of polyisocyanate, and one side of the fibrous structure base material 22 is provided. A surface coating 23 made of a thermosetting resin containing an unsaturated bond is further provided.

The fiber structure base materials 2 and 22 are, as described above,
It constitutes the skeleton of the packaging base materials 2 and 22, and includes chemical pulp such as bleached hardwood kraft pulp and bleached softwood kraft pulp, mechanical pulp such as groundwood pulp, finer groundwood pulp, thermomechanical pulp, and various pulps thereof. And other fibers as the main raw material. This fiber structure substrate, specifically, fine paper, medium-quality paper, single-glossy paper and paper made by a known fourdrinier multi-cylinder paper machine, fourdrinier Yankee paper machine, cylinder paper machine, etc. Examples include acid paper such as kraft paper, neutral paper, and alkaline paper. The fibrous structure base material is not limited to these, and may be any fibrous structure having a structure in which the impregnating liquid described later and the like surely penetrates to the inside thereof and water resistance effectively appears. Preferable examples of such a fiber structure base material are relatively short fiber lengths such as coated ball and manila ball made from recycled recycled paper, paper tube base paper, corrugated liner base paper and core base paper and have a smaller density. Base paper is mentioned. Further, these fiber structure base materials may contain papermaking auxiliary agents such as a paper strength enhancer, a sizing agent, a filler and a retention aid.

The fibrous structure base materials 2 and 22 having the above-mentioned structure are impregnated with an impregnating liquid mainly containing polyisocyanate. As the polyisocyanate, various known ones such as phenylene diisocyanate (PDI), tolylene diisocyanate (TDI), naphthalene diisocyanate (NDI), aromatic diisocyanate such as 4,4 ′ diisocyanate diphenylmethane (MDI), xylylene Range Isocyanate (XDI)
Such as aromatic aliphatic diisocyanate, hydrogenated TDI, hydrogenated XDI, hydrogenated MDI, hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPD
Aliphatic or alicyclic diisocyanates such as I) and polyol adducts which are derivatives thereof, burettes,
In addition to trifunctional or higher functional polyisocyanates that are trimers and trifunctional isocyanates such as lysine triisocyanate (LTI), various oligomers and polymers containing isocyanates can be used.

The impregnating liquid is mainly composed of these polyisocyanates. For example, polyisocyanate is a drug obtained by diluting these polyisocyanates with a non-reactive solvent. When the polyisocyanate is liquid, it may be used alone as an impregnating liquid.

On the other hand, the fibrous structure base material impregnated with the impregnating liquid mainly composed of polyisocyanate has a function of reacting with an isocyanate group to cause the packaging base material to exhibit desired water resistance and heat resistance. Whether the inside of the base material 2 is further impregnated with a thermosetting resin containing an unsaturated bond (see FIG. 1),
Alternatively, a surface coating 23 made of a thermosetting resin containing an unsaturated bond is provided on at least one surface like the fiber structure base material 22 (see FIG. 2).

The thermosetting resin containing an unsaturated bond is
Unsaturated alkyd resin, unsaturated polyester, acrylic ester resin, melamine resin, allyl resin, epoxy resin, furan resin, unsaturated FRTP and the like can be used.
In addition to having a network-like three-dimensional structure due to intermolecular chemical reaction, these resins react with the isocyanate groups of polyisocyanate, and a network-like three-dimensional structure with a more excellent water resistance group or water resistance is a fiber structure. It easily exists in the base material, and it becomes possible to impart good heat resistance and water resistance to the packaging base material.

The fibrous structure base material is impregnated with an impregnating liquid mainly composed of polyisocyanate or a thermosetting resin containing an unsaturated bond, or a surface coating of a thermosetting resin containing an unsaturated bond is applied. It may be carried out at the time of primary processing in the papermaking stage of the fiber structure base material, or at the time of secondary processing to the fiber structure base material such as the paper made into paper.

The impregnation is performed by coating the fiber structure base material in a known coating facility arbitrarily selected from a dip coater, a gravure coater, a bar coater, a roll coater, an air knife coater, a blade coater and the like. You can Among them, the gravure coating method and the roll coating method, which can form a uniform coating film in a certain amount, are desirable. In other words, with the gravure coating method, by increasing the number of units, uniform impregnation processing or formation of a uniform surface film can be done at once, and mass production of packaging base materials with high wet strength can be expected. It becomes possible to say that it is more preferable. The coating amount is extremely important for obtaining a desired quality, and may be determined by the viscosity and permeability of the impregnating liquid used, the type and thickness of the fibrous structure base material, and the like.

Further, as shown in FIG. 2, the formation of the surface coating made of the thermosetting resin can obtain sufficient water resistance even if only one side of the fiber structure base material is used. By providing the resin, the diffusion of the resin into the fiber structure base material is increased, the reaction with the isocyanate group is further promoted, and a large water resistance effect can be exhibited in the base material for packaging.

Further, the secondary processing by these coating methods is easier to prepare the chemicals than the primary processing by the addition of the internally added chemicals in the conventional papermaking process, and the required chemical quantity can be adjusted by adjusting the coating amount. Because it is predictable, there is little loss of drug. In addition, not using extra chemicals has the effect of improving the work environment and safety.

Further, the reaction temperature between the thermosetting resin and the isocyanate resin is sufficient, but a temperature at which the contained solvent is dried is sufficient. After being processed by the gravure coating method or roll coating method, heat treatment at 100 ° C to 180 ° C for several seconds to several minutes in an organic solvent drying oven can enhance both dry strength and wet strength. become.

The amount of the thermosetting resin applied may be appropriately set depending on the balance between quality and cost. With respect to water resistance and heat resistance, if the coating liquid is uniformly applied to the fiber structure base material, the application amount is not so much affected.
For example, considering that it is used as a packaging base material for container production, it is sufficient to form a surface film with a coating amount corresponding to 5% to 15% by weight of the fiber structure base material. Strength can be obtained.

Among the thermosetting resins containing unsaturated bonds mentioned above, as the acrylic ester resin, all ester resins synthesized by a usual transesterification reaction such as ethyl, propyl, butyl, octyl, dodecyl and hexadecyl can be used. The coating amount can be adjusted according to the viscosity and the permeability to be used according to the desired water resistance. Similarly, an ester resin containing acrylonitrile, acrylamide, methacrylic acid and its ester can also be used,
Due to the reactivity with the isocyanate group, high water resistance can be obtained. Due to the reactivity of the unsaturated bond, these acrylic ester resins easily react thermally with the isocyanate groups in the impregnating liquid mainly containing isocyanate even at low temperature to form a three-dimensional network structure and to form a packaging base material. Not only water resistance but also heat resistance can be dramatically improved.

The usage of the packaging base material of the present invention is as follows.
In addition to being used as packaging materials such as packaging paper for packaging foods and as container materials that make up containers such as pouches, bottles, and composite paper containers, plastics, metals or other materials used in bathrooms, toilets, kitchens, etc. It can be used as a label to be attached to a paper container or the like, or as an exterior material such as a lid material or a bottom material for the container. Considering the usage form of these as an exterior material, it is necessary to provide an adhesive layer or a plastic film as the outermost layer on the packaging base material having the above-mentioned configuration.

As the adhesive, for example, polyurethane type,
Various adhesives such as polyacryl-based, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, and other adhesives for laminate can be used. The anchor coat layer is appropriately selected according to the level of heat resistance, and if necessary, an anchor coating layer such as an isocyanate-based (urethane-based), polyethyleneimine-based, polybutadiene-based, organic titanium-based anchor coating agent or the like. After being provided, it may be formed by a known coating method.

As the plastic film, a film made of a polyolefin resin such as polyethylene resin or polypropylene resin, or a barrier resin such as polyester resin, polyamide resin or ethylene-vinyl alcohol copolymer, or those Examples of the perforated processed material include a single film, a resin film deposited with an inorganic material typified by Al, AlO _x , and SiO _x , or a composite film in which these are combined. Appearance and oxygen barrier properties required as an exterior material. In consideration of various properties such as water vapor barrier property and aroma retaining property, an appropriate one may be selected from these plastic films and laminated on the fiber structure substrate having the above-mentioned constitution. Examples of the laminating method include a wet lamination method, a dry lamination method, a solventless dry lamination method, an extrusion lamination method, a T-die coextrusion molding method, a coextrusion lamination method, and various other lamination methods. The method can be adopted. If necessary, for example, corona treatment, frame treatment or the like may be performed before the lamination.

On the other hand, FIG. 3 shows a sectional structure of the container according to the present invention. This container 31 is a so-called tray container,
In the container member 34 constituting the container member 34, the fibrous structure base material is impregnated with an impregnating liquid mainly containing polyisocyanate, and the fibrous structure base material is further impregnated with a thermosetting resin containing an unsaturated bond. Or a packaging substrate in which a surface coating made of a thermosetting resin containing an unsaturated bond is further provided on at least one side of the fiber structure substrate, and is formed into a container shape by vacuum molding or pressure molding. It is manufactured by molding.

Further, the cross-sectional configuration diagram shown in FIG. 4 shows a container 41 having a triangular roof at the top, and a container member 44 constituting the container 41 has a fiber structure base material containing an impregnating liquid mainly composed of polyisocyanate. While being impregnated, the fiber structure substrate is further impregnated with a thermosetting resin containing an unsaturated bond, or consists of a thermosetting resin containing an unsaturated bond on at least one side of the fiber structure substrate. The packaging base material 42 is further provided with a surface film, and a thermoplastic resin layer 43 is further provided on the inner surface thereof. Since these containers are configured as described above, they are excellent in water resistance and heat resistance.

The shape of the container of the present invention is, in addition to the two examples described above,
A shape having an opening above, a cup shape having a body and a bottom, a tray shape, a top, a tubular shape having a body and a bottom,
A tetrahedron having a top, a body and a bottom, a hexahedron, or a roof shape, a so-called milk pack shape having a body, a bottom, and a mountain-shaped top, a bag shape, a bottle shape, a trihedral shape, so-called triangular milk. There is a shape or the like, and any shape can be selected, and the shape is not particularly limited.
Further, the container of these shapes may be prepared by selecting an appropriate one from a sheet forming method such as vacuum forming and pressure forming, various bag making methods, seal packaging methods, box making methods and the like. .

[0036]

EXAMPLES Next, specific examples of the present invention will be described in detail below. <Example 1> As a fibrous structure base material, a basis weight of 290 g / m.
Using the cup paper of No. ² , as the impregnating liquid, an adduct of isophorone diisocyanate diluted in ethyl acetate at a solid content ratio of 10% is used, and the fiber structure substrate is impregnated by the dipping method. After doing 110
Put in an oven for drying organic solvent at ℃ for 5 minutes to dry,
An impregnated paper was made. Then, using a resin coating solution prepared by diluting a low molecular weight acrylic acid ester resin in ethyl acetate at a solid content ratio of 20%, the impregnated paper is further impregnated by a dipping method, and an organic solvent at 110 ° C is used. Put in a drying oven for 5 minutes to dry, evaporate the dispersion solvent,
A packaging substrate was created.

Example 2 A cup paper having a basis weight of 290 g / m ² was used as the fibrous structure base material, and an adduct of isophorone diisocyanate was used as the impregnating liquid at a solid content ratio of 10.
Using the one diluted in ethyl acetate at a ratio of 100%, the fiber structure base material is impregnated by the dipping method, and then placed in an oven for drying an organic solvent at 110 ° C. for 5 minutes to dry the impregnated paper. Created. Then, using a resin coating liquid prepared by diluting a high-molecular acrylic ester resin in ethyl acetate at a solid content ratio of 20%, the impregnated paper is impregnated by a dipping method and then used for an organic solvent at 110 ° C. It was put in a drying oven for 5 minutes to be dried, and the dispersion solvent was evaporated to prepare a packaging base material.

Comparative Example 1 A cup paper having a basis weight of 290 g / m ² was used as the fibrous structure base material, and an adduct of isophorone diisocyanate was used as the impregnating liquid at a solid content ratio of 1.
Use the one diluted in ethyl acetate at the rate of 0%,
After impregnating the fibrous structure base material by the dipping method, the fibrous structure base material was placed in an organic solvent drying oven at 110 ° C. for 5 minutes to be dried to prepare an impregnated paper. Then, the above polyisocyanate resin was diluted with ethyl acetate at a solid content ratio of 10% again, and the impregnated paper was impregnated by the dipping method, and then the oven for drying the organic solvent at 110 ° C. 5 minutes and dried to evaporate the dispersion solvent to prepare a packaging base material.

Example 3 A cup paper having a basis weight of 290 g / m ² was used as a fibrous structure base material, and an adduct of isophorone diisocyanate was used as an impregnating liquid at a solid content ratio of 10.
% Diluting in ethyl acetate, the fiber structure base material is impregnated by the dipping method, and then placed in an oven for drying an organic solvent at 110 ° C. for 5 minutes to dry the impregnated paper. It was created. Next, a resin coating liquid prepared by diluting a low molecular weight acrylic ester resin as a thermosetting resin in ethyl acetate at a solid content ratio of 10% was used.
After the impregnated paper is impregnated and coated by the gravure coating method, it is placed in an oven for drying organic solvent at 110 ° C.
It was put for a minute and dried, and the dispersion solvent was evaporated to prepare a packaging base material.

Example 4 As the fiber structure base material, cup paper having a basis weight of 290 g / m ² was used, and as the impregnating liquid, an adduct of isophorone diisocyanate was used at a solid content ratio of 1.
Use the one diluted in ethyl acetate at the rate of 0%,
After impregnating the fibrous structure base material by the dipping method, the fibrous structure base material was placed in an organic solvent drying oven at 110 ° C. for 5 minutes to be dried to prepare an impregnated paper. Next, a high-molecular acrylic ester resin is used as a thermosetting resin in a solid content ratio of 10%.
Using a resin coating solution diluted in ethyl acetate at a ratio of, the gravure coating method is used to perform impregnation coating treatment, and then put in an oven for drying an organic solvent at 110 ° C. for 5 minutes to dry the dispersion solvent. Evaporated to make a packaging substrate.

Comparative Example 2 A cup paper having a basis weight of 290 g / m ² was used as the fiber structure base material, and an adduct of isophorone diisocyanate was used as the impregnating liquid at a solid content ratio of 10.
% Diluting in ethyl acetate, the fiber structure base material is impregnated by the dipping method, and then placed in an oven for drying an organic solvent at 110 ° C. for 5 minutes to dry the impregnated paper. It was created. Then, using a resin coating solution prepared by diluting a polyisocyanate resin in ethyl acetate at a solid content ratio of 10% again, an impregnation coating process is performed by a gravure coating method, and then an oven for an organic solvent at 110 ° C. 5 minutes and dried to evaporate the dispersion solvent to prepare a packaging base material.

The tensile rupture strength and the Taber strength strength after hot water treatment (60 minutes treatment with hot water at 95 ° C.) of the processed papers of Examples 1 to 4 and Comparative Examples 1 and 2 prepared as described above were measured. It was measured. The total impregnation amount of the resin component in the packaging base materials of Examples 1 and 2 and Comparative Example 1 was about 25 g, and the total impregnation amount of the resin component in the packaging base materials of Examples 3 and 4 and Comparative Example 2 was about 20 g. It is almost constant.

The test method is described below. The measuring method of tensile breaking strength is based on JIS8113. Taber strength is JIS8
Compliant with 125.

[0044]

[Table 1]

From Table 1, it is possible to impregnate an impregnating solution mainly containing a fibrous structure-based polyisocyanate, and further coat or impregnate a thermosetting resin containing an unsaturated bond such as a thermosetting acrylic ester resin. Thus, it can be seen that the strength after the hot water treatment is obviously improved. Further, these fibrous structure base materials have higher strength than the impregnated fibrous structures of Comparative Examples 1 and 2 in which the impregnating liquid mainly containing polyisocyanate is impregnated twice. This is because the thermosetting acrylic acid ester resin and the polyisocyanate resin react with each other in the fiber structure to have a three-dimensional structure and maintain the strength.

[0046]

EFFECT OF THE INVENTION The packaging substrate having high water resistance of the present invention is obtained by impregnating a thermosetting resin containing an unsaturated bond into an impregnated fiber structure substrate impregnated with an impregnating liquid mainly containing polyisocyanate. Or by coating, react with low heat,
By taking a three-dimensional structure, it exhibits excellent water resistance and heat resistance. Therefore, it has a lower water absorption rate than the conventional fiber structure base material for packaging, has excellent strength when wet, greatly improves water resistance, and is a label for sticking to metal containers and plastic bottles used in bathrooms. Alternatively, it can be used as a lid material and a bottom material for a container that stores foods that are water resistant, hot water cooked / sterilized, and is excellent in water resistance, hot water resistance, and hot water resistance.

The container comprising the packaging material having high water resistance of the present invention as a container member can be prepared by boiling sterilization treatment, retort sterilization treatment or hot water treatment which requires water resistance and heat resistant water resistance. Possible and extremely water resistant
It has excellent heat resistance.

[Brief description of drawings]

FIG. 1 is a schematic sectional configuration explanatory view showing an embodiment of a packaging base material.

FIG. 2 is a schematic sectional configuration explanatory view showing another embodiment of the packaging base material.

FIG. 3 is a schematic sectional configuration explanatory view showing an embodiment of a container.

FIG. 4 is a schematic sectional configuration explanatory view showing another embodiment of the container.

[Explanation of symbols]

1, 21 ... Base material for packaging 2, 22, 42 ... Fiber structure base material 23 ... Surface coating 31, 41 ... Container 34, 44 ... Container material

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65D 5/62 B65D 65/40 A 65/40 65/42 BRH 65/42 BRH BSE BSE BSG BSG BSK BSK BSLA BSL 5/42 Z F-term (reference) 3E060 AA05 AA11 AB02 AB12 BC01 BC04 BC08 DA11 DA21 EA13 EA14 3E086 AD02 AD05 AD06 BA02 BA04 BA14 BA15 BA25 BB71 BB85 CA01 CA35 4F100 AK25A AK25B AK51A BA02 DA01 DG10A EH46 EJ82A GB15 GB16 JB07 JB13A JB13B JJ03

Claims (5)

[Claims] 1. A fibrous structure base material is impregnated with an impregnating liquid mainly composed of polyisocyanate, and a fibrous structure base material is further impregnated with a thermosetting resin containing an unsaturated bond, or A packaging base material, wherein a surface film made of a thermosetting resin containing an unsaturated bond is further provided on at least one surface of the fiber structure base material. 2. The packaging base material according to claim 1, wherein surface coatings made of a thermosetting resin containing an unsaturated bond are provided on both surfaces of the fiber structure base material. 3. The packaging base material according to claim 1, wherein the thermosetting resin is an acrylic ester resin containing an unsaturated bond. 4. The fiber structure base material is impregnated with an impregnating liquid mainly containing polyisocyanate, and the fiber structure base material is further impregnated with a thermosetting resin containing an unsaturated bond, or A container, wherein a packaging base material in which a surface coating made of a thermosetting resin containing an unsaturated bond is further provided on at least one surface of a fibrous structure base material is used as a container material. 5. A thermoplastic resin layer is provided on the inner surface of a packaging base material that constitutes a container.
The container described in.