JPH11235794A - Easily openable container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart both outstanding sealing and opening properties with a lid material by positioning a surface phase comprising an olefin resin, a styrene resin and a compatibilizer inside a container, and enabling the lid material to be peeled structurally from the container. SOLUTION: The base layer 3 of a container 1 is formed of a styrene and the styrene resin contains a polymer having an aromatic vinyl monomer such as a non-rubber modified polystyrene resin as a main composition unit. Further, a surface layer 2 is laminated on the inside of the base layer 3, and is formed of a resin composition of olefin resin, styrene resin and a compatibilizer. In addition, the container 1 is sealed by thermally sealing a flange part 1b with a lid material 4 and at the same time, the lid material 4 is freely peelable. Thus it is possible to obtain both the sealing and the opening properties with the lid material 4 as characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easily openable container which is useful as a container having an excellent peeling property, such as a dessert container for jelly and pudding, a tofu container and the like.

[0002]

2. Description of the Related Art Conventionally, in the case of dessert foods such as jelly, pudding, yogurt, and tofu, after filling or storing the contents in a container body, a flange portion extending from the container body and a lid material are heat-sealed. It is manufactured by. In a container provided with these lids, the resin of the container body and the resin of the lid are formed of the same or different resins. That is,
When the container body and the lid member are formed of the same resin, a container having high heat sealing strength and high sealing performance can be obtained. However, since the sealing strength is high, the lid cannot be easily peeled off by hand, and the lid needs to be opened using a blade, which is inferior in handleability and difficult in safety. On the other hand, when the container main body and the lid member are formed of different kinds of resins, the openability can be improved, but the adhesiveness and the sealability by heat sealing are reduced. In such a case, it is possible to bond the lid member and the container using an adhesive, but there is a concern that the use of the adhesive may increase the number of steps and increase the cost.

[0003] As a lid material for an easily-openable container, Japanese Patent Laid-Open Publication No. Hei 4-93248 discloses a laminated film having a styrene resin sheet provided on one side of a base material layer so as to be peelable. It has been proposed to use as Japanese Patent Application Laid-Open No. 9-40001 discloses that a lid material for sealing with a flange portion of a container can be thermally bonded to a base material layer, an easily breakable layer formed of a polymer alloy or the like, and a flange portion, and can be easily cut. It has been proposed to comprise a heat seal layer.

Japanese Patent Publication No. 62-8306 discloses an olefin resin of 20 to 80% by weight and a styrene resin of 80 to 2%.
A container comprising an inner layer of a resin film mixed with 0% by weight and an outer layer of a styrene-based resin sheet, wherein an edge of the inner layer and a lid member made of an olefin-based resin are heat-sealed and sealed. Has a peel strength of 0.5 to 4.0 kg / 2.
An easily openable container that is 0 mm is disclosed. This document describes that when opened, the mixed resin film layer of the inner layer of the container undergoes cohesive failure. However, in this container, the mixed resin film located on the inner surface of the container is composed of a styrene-based resin and an olefin-based resin. Is difficult to improve.

JP-A-6-190988 discloses a polystyrene resin sheet as a highly oil-resistant sheet.
Resin obtained by adding 0.5 to 30 parts by weight of a hydrogenated styrene-conjugated diene block copolymer to 100 parts by weight of a resin composition of 35 to 80% by weight of a polystyrene resin and 65 to 20% by weight of a polyolefin resin. There is disclosed a laminated sheet with a composition film, and a molded article (tray) in which the resin composition film layer is located inside the laminated sheet. However, this document does not describe improving both the sealing properties and the opening properties in connection with the lid material.

As an easy-open container having high sealing strength and moderate opening strength, a release layer is formed on a flange portion of the container, and a weakened portion (a weakened portion due to a notch or an inner edge of a seal bar) is formed on the flange portion. Known containers are known. In this container, a weakened portion is formed in the middle part in the radial direction of the flange portion, and in the region outside the weakened portion of the flange portion, the release layer is transferred to the lid material to improve the openability,
Sealing is improved by sealing in the area inside the weakened part. However, this container uses a weakened portion forming device,
It is necessary to form a weakened portion in the flange portion, and the number of working steps increases. Further, when the thickness of the container forming sheet changes, the strength at the time of opening changes, so the depth of the weakened portion (notch) must be adjusted. In particular, in the case of containers having various sizes and shapes, it is necessary to form a weakened portion for each container, which reduces the production efficiency of the container.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an easy peel container (easily openable container) having a high level of both the sealing property and the opening property of the lid material in a well-balanced manner. It is in. Another object of the present invention is to provide an easy peel container that can control the sealing property and the opening property with a lid material without forming a weakened portion.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object. As a result, when a container is constituted by a laminated structure of a specific base layer and a surface layer, a high sealing property, which is a contradictory characteristic, is obtained. The present inventors have found that it is possible to achieve both the openability and the openability, and completed the present invention. That is, the easily-openable container of the present invention is a container that can be hermetically sealed by sealing the container (i) and the lid member (ii), wherein the container (i) is made of a base layer (styrene) resin. A) and a surface layer (B) laminated on at least one surface of the styrene-based resin layer (A) and composed of an olefin-based resin (b1), a styrene-based resin (b2), and a compatibilizer (b3). ) And
A surface layer (B) is located at least inside the container (i), and the lid (ii) is peelable from the container (i).
In such a container, the base layer (A) can be composed of a rubber-modified styrene-based resin, and the surface layer (B) is a propylene-based resin (b1), a non-rubber-modified styrene-based resin (b2), and a compatibilizer (b3). Can be configured. Further, the container (i) comprises:
Usually, it has a flange part heat-sealed with the lid material (ii), and the lid material (ii) usually has an olefin-based resin layer at least on the sealing surface with the container (i). .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings as necessary. FIG. 1 is a schematic sectional view showing an example of the container of the present invention, and FIG. 2 is a partial sectional view of the container shown in FIG.

As shown in FIGS. 1 and 2, an easy peel container (easy-to-open container) 1 is a laminate of a surface layer 2 located inside and a base layer 3 located outside the surface layer. It is formed with. The container 1 is composed of a container body 1a in which a housing portion is formed, and a flange 1b extending from the top of the side wall of the container body. The surface layer 2 of the flange 1b has a lid. Sealable with the material 4. That is, the container 1 can be hermetically sealed by the heat seal bonding with the lid member 4 at the flange portion 1b.

The sealing surface of the flange portion 1b is flat without a notch and a weakened portion, and is flat.
Therefore, the lid member 4 and the flange portion 1b can be uniformly and tightly heat-sealed. In addition, at the time of opening, the angle θ between the flange portion 1b and the side wall of the container is formed to be about 120 ° in order to peel off the surface layer 2 together with the lid member 4 and break the surface layer 2.

The base layer (A) is composed of a styrene-based resin (a), and the surface layer (B) is composed of an olefin-based resin (b1) and a styrene-based resin in order to achieve both high sealing properties and high opening properties. It is composed of a resin composition (polymer alloy) of the resin (b2) and the compatibilizer (b3), and the peel strength with the lid material is adjusted. As shown in FIG. 3, in the container 1 having such a configuration, the lid member 4 can be peeled off from the container 1 when the container is opened. In particular, the surface layer 2 may be openable by peeling and breaking at the interface with the base layer 3.

The base layer (A) is made of a styrene resin (a) having rigidity and high moldability in a container. The styrene-based resin (a) includes a polymer having an aromatic vinyl monomer as a main constituent unit, for example, a non-rubber-modified polystyrene-based resin (a1) and a rubber-modified polystyrene-based resin (a2). The styrene resin for forming the base layer (A) is at least one of a polystyrene resin (a1) and a rubber-modified polystyrene resin (a2), particularly at least a rubber-modified polystyrene resin (a
It is advantageous to configure in 2). When the rubber-modified polystyrene resin (a2) is used, the container can be provided with mechanical strength and toughness.

Examples of the aromatic vinyl monomer include styrene, alkylstyrene (for example, vinyl toluene such as o-methylstyrene, m-methylstyrene, p-methylstyrene, p-ethylstyrene, p-isopropylstyrene, butyl). Styrene, pt-butylstyrene,
Examples thereof include 2,4-dimethylstyrene and α-alkylstyrene (for example, α-methylstyrene and α-ethylstyrene). These aromatic vinyl monomers can be used alone or in combination of two or more. Preferred styrene monomers include styrene, vinyl toluene,
α-methylstyrene and the like are included, and styrene is particularly preferred.

The aromatic vinyl monomer is a copolymerizable monomer,
For example, C _1-10 alkyl (meth) acrylates such as methyl (meth) acrylate, α, β-ethylenically unsaturated carboxylic acids such as (meth) acrylic acid, and unsaturated acids such as maleic acid and maleic anhydride. It may be used in combination with a polyvalent carboxylic acid or a derivative thereof (acid anhydride, maleimide, N-methylmaleimide, polymerizable imide such as N-phenylmaleimide, etc.), (meth) acrylonitrile, and (meth) acrylamide.

The rubber-modified polystyrene-based resin (a2) is a polymer in which a rubbery polymer is dispersed in a matrix composed of the polystyrene-based resin (a1), and is a block copolymer or a graft copolymer. Any of coalescence may be used. Preferred rubber-modified polystyrene resin is usually
Graft obtained by polymerizing a monomer mixture containing at least an aromatic vinyl monomer in the presence of a rubbery polymer by a conventional method (bulk polymerization, bulk suspension polymerization, solution polymerization, emulsion polymerization, etc.) It is a copolymer.

Examples of the rubbery polymer include diene rubbers [polybutadiene (low cis or high cis polybutadiene), isoprene rubber, chloroprene rubber, styrene-butadiene copolymer, etc.], ethylene-vinyl acetate copolymer , Acrylic rubber, ethylene-propylene rubber (EPDM) and the like. These rubbery polymers can be used alone or in combination of two or more. Preferred rubbery polymers are diene rubbers (polybutadiene (butadiene rubber), isoprene rubber, styrene-butadiene copolymer, etc.).

In the rubber-modified polystyrene resin, the content of the rubbery polymer is, for example, about 2 to 30% by weight, preferably about 5 to 25% by weight, particularly about 5 to 20% by weight. The form of the rubbery polymer dispersed in the matrix composed of the polystyrene resin is not particularly limited, and may include a core / shell structure, an onion structure, a salami structure, and the like. The particle diameter of the rubber-like polymer constituting the dispersed phase is, for example, about 0.1 to 10 μm, preferably about 0.2 to 7 μm, particularly about 0.5 to 5 μm, depending on the use of the resin composition. Can be selected from the range.

The olefin resin (b) of the surface layer (B)
Examples of 1) include homo- or copolymers of olefins, for example, ethylene resins (low density, medium density, high density, linear low density polyethylene, ethylene-propylene copolymer, ethylene- (meth) acrylic acid copolymer). And polypropylene-based resins (polypropylene, propylene-ethylene copolymer, propylene-C _4-10 α-olefin copolymer, propylene-ethylene-C _4-10 α-olefin copolymer, etc.). . These olefin polymers can be used alone or in combination of two or more.

As the styrene-based resin (b2) constituting the surface layer, the rubber-modified styrene-based resin (a2) constituting the base layer can also be used. At least a non-rubber-modified styrene resin (a1) of the rubber-modified styrene resin (a2) can be used.

It is difficult to improve the oil resistance if the surface layer located inside the container is made of only a styrene-based resin, but since the surface layer is made of a polymer alloy containing an olefin-based resin, Even if the food container is filled with oil-containing contents, the oil resistance can be improved. Among the olefin resins, a propylene resin (particularly, polypropylene) is preferable from the viewpoints of oil resistance, water vapor barrier properties, and price.

The ratio of the olefin-based resin (b1) and the styrene-based resin (b2) is such that the adhesiveness and sealing property with the lid material are high,
Moreover, a range where peeling and breaking are possible, for example, olefin-based resin (b1) / styrene-based resin (b2) = 50/50 to 9
0/10 (weight ratio), preferably 50/50 to 85/1
5 (weight ratio), more preferably 50/50 to 80/2
0 (weight ratio) range, usually 50/5
It is about 0 to 80/20 (weight ratio).

The resin composition for forming the surface layer further contains a compatibilizer (b3). The compatibilizer (b3) is derived from a styrene-conjugated diene-based copolymer, for example, a random or block copolymer of a vinyl aromatic compound and a conjugated diene compound, a hydrogenated copolymer thereof, or a conjugated diene compound. An epoxy-modified copolymer in which a double bond is epoxidized is included.

Typical hydrogenated copolymers include, for example, hydrogenated rubber-modified styrene resins (styrene-ethylene-butylene-styrene (SEBS) copolymer, styrene-ethylene-propylene-styrene (SEPS) copolymer). Coalescence etc.) can be illustrated. The hydrogenated copolymer also includes a random or block copolymer of a vinyl aromatic compound and at least one α-olefin.

As the epoxy-modified copolymer, a polymer block (such as a polystyrene block) mainly containing a vinyl aromatic compound (such as styrene) and a conjugated diene compound (such as butadiene and isoprene) are mainly used in the same molecule. Among the block copolymers composed of (a polybutadiene block, etc.) and its partially hydrogenated polymer block, there are epoxy-modified block copolymers in which double bonds derived from conjugated diene compounds have been epoxidized. Can be illustrated. The ratio of the vinyl aromatic compound to the conjugated diene compound can be appropriately selected from the range of the former / the latter = about 5/95 to 95/5 (weight ratio).

The amount of the compatibilizer (b3) used is a total amount of the olefin resin (b1) and the styrene resin (b2) of 100
0.1 to 30 parts by weight, preferably 0.1 to 30 parts by weight, based on parts by weight.
It is about 5 to 15 parts by weight, more preferably about 1 to 15 parts by weight, and can usually be selected from the range of about 1 to 10 parts by weight.

The thickness of the base layer and the surface layer can be appropriately selected, but is usually about 0.1 to 3 mm, preferably about 0.2 to 2 mm, and more preferably about 0.3 to 1 mm. The thickness of the surface layer of at least the flange portion of the container is 5 μm to 1 mm, preferably 15 to 500 μm
(For example, 20 to 100 μm), and more preferably 20
About 70 μm. If the thickness of the surface layer at the flange portion is less than 10 μm, when the contents are filled and transported, the surface layer may be broken and the contents may leak. Impair. In order to improve the stiffness (rigidity) of the container and to prevent uneven heating and thickness during molding of the container, the thickness of the container including the flange portion is usually about 0.1 to 2 mm. Preferably it is. Further, the ratio of the thickness of the base layer to the thickness of the surface layer is as follows: surface layer / base layer = 1/100 to 70/1.
00, preferably about 3/100 to 50/100, more preferably about 5/100 to 25/100.

The lid material may be transparent, translucent or opaque. The lid material may be paper, plastic (unstretched polypropylene film (CPP), unstretched polystyrene film (CPS), polyethylene terephthalate film (PET). ), A metal (such as aluminum foil) or a laminate thereof (eg, CPP / PET, CPS / PET), a vapor-deposited paper, a printed film, or the like. In particular, in order to adjust the peel strengths F1 and F2 to be described later, the cover material is made of a resin common to the polymer alloy of the surface layer (an olefin resin such as polypropylene, a styrene resin such as polystyrene). It is preferable to form an olefin-based resin layer (particularly a polypropylene-based resin layer or the like) on the sealing surface of the above. Olefin resin layer (especially polypropylene resin layer) has high oil resistance,
Useful as a food container.

In such a container, the surface layer is peelable and breakable from the base layer. Therefore, when the container is opened using the lid material, the lid material peels off from the base layer together with the surface layer, and breaks at a predetermined portion of the flange portion. In order to smoothly break the surface layer, the angle θ between the flange portion and the side wall of the container is set to 40 to 170 ° (preferably 60 to 15) depending on the breaking strength of the surface layer.
0 °, more preferably 90 ° to 140 °). If the angle θ is less than 40 °, it is difficult to form the container, and the angle θ becomes an acute angle, and there is a possibility that the surface layer is broken by an external force acting in a transportation process or the like. However, there is a possibility that the surface layer at the bottom of the container may be peeled off without breaking at the flange.

The breaking strength of the surface layer was 40 μm thick.
In the above, 0.5 to 1000 kg / cm ² , preferably 1 to 700 kg / cm ² , more preferably 10 to 50 kg / cm ²
0 kg / cm ^2, in particular 100 to 300 / cm ² or so, usually, it is selected from 50~500kg / cm ² in the range of about. If the breaking strength is less than 0.5 kg / cm ² , it is difficult to ensure high sealing properties,
If it exceeds 0 kg / cm ² , it becomes difficult to break the surface layer,
Easy to open. The breaking strength of the surface layer can be controlled by the composition ratio of the olefin resin, the styrene resin, and, if necessary, the compatibilizer, the morphology of the polymer alloy, and the like.

In the container of the present invention, when the surface layer of the container (particularly the flange portion of the container) and the lid member formed of a transparent film (CPP, CPS, etc.) are heat-sealed, the sealing portion (flange portion) is formed. Cover material)
Usually, it is transparent. Therefore, it can be easily confirmed whether or not the flange portion is securely and uniformly sealed. In addition, the container of the present invention does not peel off clearly at the interface between the surface layer and the base layer in order to ensure high sealing properties, and when the container is opened with the lid material, the surface layer of the seal portion becomes the lid material. Transfer (at least part of the surface layer adheres to the lid)
There is a feature. Therefore, it can be confirmed whether or not the container has been securely sealed by the attachment to the lid member, and this can be used as a useful index for guaranteeing the tightness of the container. In particular, when the lid is formed of a film having transparency (CPP, CPS, etc.), the haze of the peeled seal portion of the lid after opening is 2% or more (usually 5% or more, for example, 10 to 50%, especially about 15 to 40%). If the haze value is less than 2%, it is difficult to reliably confirm opening by visual inspection.

Further, in order to improve the opening property while improving the sealing property by the lid material, the peel strength between the lid material and the surface layer (g / 15 m
When m) is F1 and the peel strength (g / 15 mm) between the surface layer and the base layer is F2, the container preferably satisfies the following conditions. (1) F1> F2 (2) F1−F2 ≧ 20, preferably F1−F2 ≧ 100, especially F1−F2 ≧ 500 (3) 2000 ≧ F2 ≧ 100, preferably 1700 ≧ F2 ≧ 100, especially 1600 ≧ F2 ≧ 500 If the difference F1-F2 in peel strength is less than 20 g / 15 mm, there is a possibility of peeling at the interface between the lid material and the surface layer, or at the interface between the surface layer and the base layer at the time of opening the container, and the peeling portion varies,
It becomes difficult to open smoothly. Peel strength F2 is 50
If the thickness is less than 15 g / 15 mm, the base layer and the surface layer are easily peeled off, interfacial peeling occurs due to vibrations during the transportation process, and it is difficult to improve the sealing property.
If it exceeds m, the opening property tends to decrease. When the relationship of the peel strength is F1 <F2, the peeling portion of the container is the interface between the lid member and the surface layer of the container. In this case, it is difficult to control the sealing strength because the sealing strength changes depending on the sealing conditions (seal temperature, pressure, time). On the other hand, when F1> F2, a stable sealing strength can be obtained even if the sealing conditions fluctuate, because the peeling site is the interface between the surface layer and the base material layer.

The surface layer may be laminated on at least one surface of the base layer. On the other surface of the base layer, a back layer made of a polymer alloy having the same or different composition as the surface layer is provided. May be formed. Both surfaces of the base layer can usually be covered with a polymer alloy layer (surface layer and back layer) composed of the same components (olefin-based resin, styrene-based resin and, if necessary, a compatibilizer) as the surface layer.

The base layer, the surface layer and the lid material are made of various additives such as stabilizers (antioxidants, ultraviolet absorbers, heat stabilizers, etc.), antistatic agents, flame retardants, release agents, lubricants. , A coloring agent, a filler and the like.

In the container of the present invention, a laminated sheet of a base layer and a surface layer is formed into a container, and the obtained container (particularly, the flange portion of the container) is hermetically sealed and opened by heat bonding such as heat sealing. It is possible to obtain a container having excellent properties, and it is not necessary to use an adhesive which is difficult in terms of safety and the like.

[0036]

According to the container of the present invention, since the surface layer and the base layer are made of a specific resin, both the sealing property and the opening property of the lid material are excellent. Moreover, the sealing property and the opening property of the lid material can be controlled without forming a weakened portion on the flange portion.

[0037]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples. In the following examples and comparative examples, evaluation of the characteristics of the laminated sheet and the moldability of the container were performed as follows. Haze value: Measured according to ASTM D1003. Thickness: measured using a dial gauge. Peel strength: 200 ° C., pressure 2 kg / cm ² , time 1 using a heat sealing machine for the flange portion of the container and the lid material.
Sealed for seconds. The heat-sealed flange is cut to a width of 15 mm to prepare a sample, the surface layer and the cover are peeled off at one end of the sample, and the cover is bent to 180 ° so as to be parallel to the flange, and pulled. Using a testing machine, the peeling strength (18
0 ° peeling) was measured, and the highest value at the time of peeling was taken as the peel strength value.

Example 1 As resins for the surface layer, pellets of polypropylene (PP) (manufactured by Sumitomo Chemical Co., Ltd., FS8611) and polystyrene (PS) (S51 manufactured by Daicel Chemical Co., Ltd.), SERS
(Septon 2104, a hydrogenated styrene-isoprene copolymer manufactured by Kuraray Co., Ltd.) was added at a weight ratio of PP: PS: SEB.
An extruder (manufactured by Ikegai Co., Ltd., twin screw extruder, screw diameter = 30 mm, L /
D = 28.5).

The pellet and an impact-resistant polystyrene resin HIPS (S86, manufactured by Daicel Chemical Co., Ltd.) were extruded into a multilayer extruder (Pla Giken, 30 mm single screw extruder 2).
Table, L / D = 30), respectively, and feed into a 0.5 mm-thick laminated sheet [surface layer (PP, P
S, SEBS alloy) / base layer (HIPS)]. Next, container molding was performed, and the container flange portion and the lid material (polypropylene PP film) were heat-sealed with a heat sealing machine.

Example 2 The composition ratio of the resin component of the surface layer was determined by weight ratio PP: PS: S
A container was formed in the same manner as in Example 1 except that EBS was 75: 25: 5, and the PP film was heat-sealed.

COMPARATIVE EXAMPLE 1 The composition ratio of the resin component in the surface layer was determined by weight ratio PP: PS = 6.
Except for 5:35, the container was molded in the same manner as in Example 1, and the PP film was heat-sealed.

Comparative Example 2 A container was prepared in the same manner as in Example 1 except that polypropylene (PP) (manufactured by Sumitomo Chemical Co., Ltd., FS8611) was used as the resin for the base layer and the surface layer, and a PP film was used as the cover material. Was heat sealed at the flange portion.

Comparative Example 3 The same as Example 1 except that polypropylene (PP) (manufactured by Sumitomo Chemical Co., Ltd., FS8611) was used as the resin for the base layer and the surface layer, and a polyethylene (PE) film was used as the lid material. And heat sealed at the flange of the container.

The results are shown in the table.

[0045]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of the container of the present invention.

FIG. 2 is a partial sectional view of the container shown in FIG.

FIG. 3 is a schematic partial sectional view showing an opened state of the container.

[Description of Signs] 1 ... Container 1a ... Container main body 1b ... Flange 2 ... Surface layer 3 ... Base layer 4 ... Lid material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B65D 77/20 B65D 77/20 H

Claims (9)

[Claims] 1. A container which can be hermetically sealed by sealing a container (i) and a lid member (ii), wherein the container (i) comprises: a base layer (A) made of a styrene resin; And a surface layer (B) laminated on at least one surface of the base resin layer (A) and formed of an olefin resin (b1), a styrene resin (b2) and a compatibilizer (b3). And a surface layer (B) at least inside the container (i).
Wherein the lid (ii) is peelable from the container (i). 2. The base layer (A) is composed of a rubber-modified polystyrene resin, and the surface layer (B) is composed of a propylene resin (b).
The container according to claim 1, wherein the container is composed of (1) a non-rubber-modified polystyrene resin (b2) and a compatibilizer (b3). 3. The ratio between the olefin resin (b1) and the styrene resin (b2) is (b1) / (b2) = 50 / 50-9.
3. The container according to claim 1, wherein the ratio is 0/10 (weight ratio). 4. The lid material (ii) has an olefin-based resin layer on at least a sealing surface with the container (i).
The container according to any one of Items 3 to 3. 5. The container according to claim 1, wherein the container (i) has a flange portion that is heat-sealed with the lid member (ii). 6. The container according to claim 5, wherein the thickness of the flange portion is 0.1 to 2 mm. 7. The container according to claim 5, wherein the thickness of the surface layer (B) at the flange portion is 5 μm to 1 mm. 8. The peel strength (g / 15 mm) between the lid material (ii) and the surface layer (B) layer is F1, and the peel strength (g / 15 mm) between the base layer (A) and the surface layer (B) is F1. The container according to claim 1, wherein the following conditions are satisfied when F2 is satisfied. (1) F1-F2 ≧ 20 (2) 2000 ≧ F2 ≧ 100 9. The surface layer (B) of the seal portion when the container is opened.
The container according to any one of claims 1 to 8, wherein the container shifts to the lid material (ii), and the peeled seal portion of the lid material (ii) has a haze value of 5% or more.