JP2000233444A - Polystyrenic heat-shrinkable film and container using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-shrinkable film optimum in the heat shrink mounting to a bottle having a neck portion from the body portion to the neck portion, from the body portion to the top surface of the cap, from the bottom portion to the neck portion or from the bottom portion to the top surface thereof and reduced in the natural shrinkage factor in the main stretching direction thereof. SOLUTION: A heat-shrinkable film has at least one layer containing a polystyrenic resin and is characterized in that the heat shrinkage factor in the main stretching direction thereof in hot water is 5-22% under a 70 deg.C×10 sec condition and 45% or more under a 80 deg.C×10 sec condition and the natural shrinkage factor in the main stretching direction thereof is 2.5% or less under a 40 deg.C×7 days condition. By this constitution, the generation of wrinkles or pits and abnormality such as shrinkage insufficiency or the like in a body portion, a bottom portion, a neck portion and a top surface is eliminated and beautiful mounting can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method in which the main stretching direction is 70
A polystyrene-based heat-shrinkable film having a moderately low heat shrinkage in a low temperature region around ゜ C and a high heat shrinkage in a high temperature region around 80 ° C, and having a small natural shrinkage, particularly useful as a label. The present invention relates to a heat-shrinkable polystyrene film.

[0002]

2. Description of the Related Art A heat-shrinkable film (label) having an inner surface printed thereon is attached to various containers such as plastic containers in order to convey information such as a product name and precautions for use and to impart design. It is generally done. The basic physical properties required for such a film include transparency, gloss, elasticity, and the like, and a film made of a polystyrene-based resin, which is a material satisfying these properties, has been studied.
For example, there are JP-A-9-272182 and JP-A-57-25349 filed by the present applicant.

In Japanese Patent Application Laid-Open No. 9-272182, 50 to 98% by weight of a styrene-butadiene block copolymer comprising 65 to 90% by weight of styrene and 10 to 35% by weight of butadiene, and ~
2% by weight of a copolymer resin layer, an intermediate layer of a polystyrene resin layer, having a heat shrinkage that could not be obtained with a single film, a natural shrinkage, and an excellent heat shrinkage for the film. A multi-layer film has been disclosed. JP-A-57-253
No. 49, styrene content of 70 to 93% by weight and butadiene content of 30 to 7 represented by (SB) _n -S (where S is a styrene block, B is a butadiene block and n is an integer of 2 or more). A heat-shrinkable film comprising 2 to 40 parts by weight of polystyrene added to 100 parts by weight of a styrene-butadiene block copolymer of 100% by weight. Was disclosed.

[0004]

However, the film disclosed in Japanese Patent Application Laid-Open No. 9-272182 has a temperature of 80 ° C.
Has a very narrow neck compared to the body, so that the so-called tapered bottle has a tight neck from the body to the neck, from the body to the top of the cap, from the bottom to the neck, or from the bottom to the cap When heat shrinking is attempted to the top surface, there is a problem that the neck and the top surface are not sufficiently shrunk and a clean finish cannot be obtained.
Further, since the film having a large heat shrinkage at 80 ° C. also has a large heat shrinkage at 70 ° C., when the film (label) is to be mounted by heat shrinkage as described above, the film (label) slips upward, and the heat shrinks to a predetermined position. There was a problem that it could not be contracted and mounted. Further, the film disclosed in Japanese Patent Application Laid-Open No. 57-25349 also has the same problem as described above because the heat shrinkage at 70 ° C. is large. Furthermore, since the film has a large natural shrinkage, if a sleeve-shaped label is stored for a long period of time, it will naturally shrink during that time and the diameter will become smaller, making it difficult to install it in a container There was a problem. The present invention is applicable to heat shrink mounting from the body to the neck of a bottle having a very thin neck compared to the body, from the body to the top of the cap, from the bottom to the neck, or from the bottom to the top of the cap. It is an object to provide a heat-shrinkable film that is an optimal heat-shrinkable film and has a small natural shrinkage in the main stretching direction.

[0005]

As a means for solving the above-mentioned problems, the present invention comprises at least one layer containing a polystyrene resin and has a heat shrinkage in the main stretching direction of 70 ° C. × 10 seconds in hot water of 5 seconds. ２２22%, 45% or more at 80 ° C. × 10 seconds, and natural shrinkage in the main stretching direction is 40 ° C. × 7
It is a heat-shrinkable film of 2.5% or less per day. An intermediate layer (B) containing at least one resin selected from the group consisting of polystyrene, impact-resistant polystyrene, and graft-type impact-resistant polystyrene; an inner / outer layer (A) containing a styrene-conjugated diene block copolymer; (C) and (A) / (B) /
It is a heat-shrinkable film including at least three layers laminated in the order of (C).

Further, the intermediate layer (B) is a layer further containing a styrene-conjugated diene block copolymer and / or a styrene-conjugated diene block elastomer, and the inner and outer layers (A) and (C) further comprise polystyrene, It is a layer containing at least one resin selected from the group consisting of impact-resistant polystyrene and graft-type impact-resistant polystyrene. Further, the present invention is characterized in that the container is provided with such a heat-shrinkable film.

[0007]

Embodiments of the present invention will be described in detail below.

The heat shrinkable film of the present invention has a heat shrinkage in the main stretching direction of 5 to 22%, preferably 7 to 21%, more preferably 10 to 20% in hot water at 70 ° C. × 10 seconds.
It is at least 45%, preferably at least 50%, more preferably at least 55% at 80 ° C. × 10 seconds, and the natural shrinkage in the main stretching direction is at most 2.5%, preferably 2 at 40 ° C. × 7 days. 0.0% or less. The main stretching direction is the direction in which the stretching ratio is greater in the longitudinal direction and the transverse direction, for example, the direction corresponding to the circumferential direction when the bottle is mounted on a bottle.

[0009] 70 ° C × 10 seconds and 80 ° C × 1 in warm water
The reason why the heat shrinkage in the main stretching direction at 0 seconds is as described above is that the film has a heat shrinkage property such that the film is temporarily fixed to the bottle in a low temperature region around 70 ° C.
If the shrinkage occurs rapidly in the high temperature range around 0 ° C, at the predetermined position, not only the torso, but also the neck and the top, which are very thin compared to the torso, will not cause abnormalities such as wrinkles and avatars. ,
In addition, the shrinkage is completely performed, resulting in a beautiful shrink finish.

5% heat shrinkage at 70 ° C. × 10 seconds
If it is lower than this, the heat shrinkage rate is so small that the film cannot be temporarily fixed to the bottle (near the entrance of the shrink tunnel). Cannot shrink. If it exceeds 22%, at this point the film will no longer shrink (near the shrink tunnel entrance) and will not be able to shrink in place. If the heat shrinkage at 80 ° C. × 10 seconds is less than 45%, the shrinkage is small, and the neck and the top surface are insufficiently shrunk. Furthermore, 90 ゜ C ×
The heat shrinkage at 10 seconds is larger than the heat shrinkage at 80 ° C., and is 65% or more, preferably 70% or more, more preferably 75% or more. By doing so, there is no shrinkage return of the neck or the top surface, and a tighter finish is obtained.

The reason why the natural shrinkage rate is set as described above is as follows.
If it is larger than 2.5%, if a sleeve-shaped label made from this film is stored for a long period of time, it will naturally shrink during that time and its diameter will be reduced, making it difficult to attach it to a bottle. This is because the problem occurs.

The container referred to in the present invention refers to various plastic bottles, glass bottles, various molded containers, and all containers to which the heat-shrinkable film of the present invention can be applied. However, bottles, especially bottles having a neck circumference of 0.6 or less, more preferably 0.5 or less of the body circumference, are preferred from the viewpoint of making the most of the properties of the heat-shrinkable film of the present invention.

The polystyrene-based resin of the present invention means all resins containing styrene as one of the constituent elements, such as polystyrene, impact-resistant polystyrene, graft-type impact-resistant polystyrene, and styrene-conjugated diene block copolymer. Polystyrene is a homopolymer or a mutual copolymer composed of styrene derivatives such as styrene, α-methylstyrene and p-methylstyrene, as well as monomers copolymerizable with styrene and styrene derivatives, for example, acrylic acid and methacrylic acid. Acids, their metal salts (eg, Na, K, L
i, Mg, Ca, Zn, Fe or other metal salts), acrylic acid esters, methacrylic acid esters, and other aliphatic unsaturated carboxylic acids and copolymers thereof with derivatives thereof. The impact-resistant polystyrene refers to a mixture of polystyrene and a synthetic rubber such as polybutadiene or polyisoprene, or a product obtained by graft-polymerizing a polystyrene to a synthetic rubber such as polybutadiene or polyisoprene. The graft-type impact-resistant polystyrene has a structure in which particles of a rubber-like polymer in which polystyrene is included in a continuous phase of polystyrene and polystyrene is grafted to a rubber component such as polybutadiene are dispersed. Means what you do.

The styrene-conjugated diene block copolymer is a copolymer containing a styrene block and a block of a conjugated diene such as butadiene or isoprene and having a styrene content of 55 to 95% by weight and a conjugated diene content of 45 to 5% by weight. For example, SJS or JSJ, or (SJ) _n- S or (JS) _n- J (S is a styrene block, J is a conjugated diene block, and n is 2 or more. Represents an integer). It should be noted that tertiary and quaternary copolymers containing other components in the styrene-butadiene block copolymer are also included in the present invention. Other components include, for example, acrylic acid, methacrylic acid, metal salts thereof (for example, metal salts such as Na, K, Li, Mg, Ca, Zn, and Fe), and fatty acids such as acrylates and methacrylates. Aromatic carboxylic acids and derivatives thereof can be exemplified. Further, a compound obtained by partially hydrogenating a double bond residue based on a conjugated diene can also be exemplified.

The styrene-conjugated diene block elastomer includes a styrene block and a conjugated diene block such as butadiene and isoprene, and has a styrene content of 5 to 50% by weight and a conjugated diene content of 95 to 50% by weight.
Of elastomer.

The heat-shrinkable film of the present invention is a film comprising at least one layer containing the above-mentioned polystyrene resin. As an example of the production method, for example, a polystyrene resin is melted using an extruder, extruded from a T-die, taken up by a take-up roll, roll-stretched in a longitudinal direction, tenter-stretched in a transverse direction, and annealed. And a method of obtaining a film by cooling and winding the film with a winder. (The stretching ratio is 3 to 10 times in the direction corresponding to the main stretching direction, and 1 to 2 times in the direction orthogonal thereto.
It is desirable to select a magnification ratio substantially within the category of uniaxial stretching. This is because a film obtained at a normal biaxial stretching magnification also has a large heat shrinkage in a direction perpendicular to the main stretching direction. This is because a closing phenomenon occurs, which is not preferable. The heat shrinkage in the orthogonal direction is preferably 6% or less at 80 ° C. for 10 seconds in warm water. ) The thickness of the heat shrinkable film is 10 to 150 microns, usually 20 to 70 microns.

The heat shrinkage rate and the natural shrinkage rate are based on the content of the resin constituting the film, the thickness of the film, the extrusion temperature, the draw ratio, the take-up temperature, the stretching ratio, the stretching speed, the temperature during stretching, the annealing conditions, and the cooling conditions. Are closely related to each other. In the present invention, the heat shrinkage in the main stretching direction is 5 to 22% at 70 ° C. × 10 seconds in hot water, 45% or more at 80 ° C. × 10 seconds, and the natural shrinkage in the main stretching direction is 40 °. C × 7
In order to obtain a heat-shrinkable film that is 2.5% or less per day, these conditions may be appropriately selected. Examples of appropriate conditions include, for example, Examples 1 and 3 described below.

The film of the present invention may be a single-layer film containing a polystyrene resin. The polystyrene-based resin is as described above. Preferably, styrene-conjugated diene is added to 100 parts by weight of at least one resin selected from the group consisting of polystyrene, impact-resistant polystyrene, and graft-type impact-resistant polystyrene. A mixed resin system in which the block copolymer is mixed in an amount of 10 to 100 parts by weight, more preferably 20 to 60 parts by weight is exemplified. Further, instead of (or in combination with) the styrene-conjugated diene block copolymer, a styrene-conjugated diene block elastomer is used as a resin 100 selected from the group consisting of polystyrene, impact-resistant polystyrene, and graft-type impact-resistant polystyrene. For parts by weight,
A mixed resin system in which 2 to 50 parts by weight, more preferably 5 to 30 parts by weight is mixed is exemplified. When such a mixed resin system is used, the range of appropriate production conditions is widened, and the heat-shrinkable film of the present invention can be easily obtained.

The film of the present invention may be a three-layer film containing a polystyrene resin. For example, an intermediate layer (B) containing at least one resin selected from the group consisting of polystyrene, impact-resistant polystyrene, and a graft-type impact-resistant polystyrene; an inner / outer layer (A) containing a styrene-conjugated diene block copolymer; (C)
And (A) / (B) / (C). The thickness of the intermediate layer (B) is 3 times the total thickness.
It is desirably 0 to 99%, preferably 50 to 97%, and more preferably 60 to 95%. It is desirable that the inner and outer layers (A) and (C) have the same resin composition and the same thickness in terms of curling.

Preferably, the intermediate layer (B) is a layer further containing a styrene-conjugated diene block copolymer and / or a styrene-conjugated diene block elastomer. The mixing amounts of the styrene-conjugated diene block copolymer and the styrene-conjugated diene block elastomer are as described above. When such a mixed resin system is used, the range of appropriate production conditions is widened, and the heat-shrinkable film of the present invention can be easily obtained.

Preferably, the inner and outer layers (A) and (C)
Is a layer containing at least one resin selected from the group consisting of polystyrene, impact-resistant polystyrene, and graft-type impact-resistant polystyrene. The mixing amount of at least one resin selected from the above group is more preferably 5 to 100 parts by weight, further preferably 15 to 40 parts by weight, based on 100 parts by weight of the resin of the inner and outer layers (A) and (C). Department. When such a mixed resin system is used, the range of appropriate production conditions is widened, and the heat-shrinkable film of the present invention can be easily obtained.

The laminating method may be any known method such as dry lamination and extrusion lamination, but may be co-extrusion (and then co-stretching).
Is simple and preferred. In the case of co-extrusion, T
It may be a flat film using a die, or a flat film formed by cutting out a tube-like film using an annular die.

[0023]

EXAMPLES Next, typical examples of the present invention will be described.

The thermal shrinkage in the main stretching direction at 70 ° C. or 80 ° C. is determined by the following method. That is, a sample 10 of 100 mm square x 100 mm square from the heat-shrinkable film
Cut out pieces. And one of this sample is 70 ° C
(Or 80 ° C) in a warm water bath for 10 seconds, immediately cooled with cold water, and then in the vertical or horizontal direction (the main stretching direction, ie, the circumferential direction of the bottle when it is mounted on the bottle). Direction) length L (mm) is measured. And one
Calculate 00-L. The same was repeated for the remaining nine samples, and the average value of a total of ten samples was defined as a heat shrinkage of 70 ° C. × 10 seconds (or 80 ° C. × 10 seconds). together,
The heat shrinkage in the direction perpendicular to the main stretching direction at 80 ° C. × 10 seconds was measured in the same manner.

The natural shrinkage of the film was defined as the natural shrinkage in the main stretching direction when the film was naturally left at 40 ° C. for 7 days.

The label shrinkage finish was evaluated by observing the state of the label after heat shrinkage of the body, bottom, neck, and top of the cap. .

Example 1 A styrene-butadiene block copolymer containing 100% by weight of polystyrene (SC-008 manufactured by Asahi Kasei Kogyo Co., Ltd.) and 20% by weight of a styrene homopolymer (Clearen 200 manufactured by Denki Kagaku Co., Ltd.)
ZH) 45 parts by weight and a styrene-conjugated diene block elastomer (TAFPRENE 12 manufactured by Asahi Kasei Corporation)
6) The mixed resin system mixed with 17 parts by weight was melted using an extruder, extruded from a T-die at 180 ° C., and taken up at a draw ratio of 102% using a take-off roll at 45 ° C .; C, roll stretching 1.8 times in the machine direction at a stretching speed of 17000% / min, preheating at 120 ° C. for 10 seconds, first zone temperature 100 ° C., second zone temperature 8
Tenter stretching is performed 6.8 times in the transverse direction at 8 ° C and a stretching speed of 1500% / min. Annealing is performed near the tenter outlet while relaxing 1% in the width direction at a temperature of 80 ° C for 3.5 seconds. Then, the resultant was primarily cooled by hot air at 40 ° C. and secondarily cooled by a cooling roll at 30 ° C. to obtain a heat-shrinkable film. The thickness of this film was 60 μm. Table 1 shows the heat shrinkage and the natural shrinkage.

Example 2 Next, gravure printing of five colors was performed on one surface of the heat-shrinkable film using a gravure printing machine. Then, using an organic solvent, the center is sealed so that the printing surface is on the inside and the lateral direction of the film corresponds to the circumferential direction of the bottle to form a tube having a folded diameter of 110 mm. The film was cut to a length of 195 mm to obtain a label.

Next, a height of 190 mm and a body diameter of 65 mm.
The label obtained in Example 1 was put on a glass bottle having a diameter of 5 mm and a diameter of 30 mm at the neck, and a wet heat shrink tunnel (length 3.
5m, vapor pressure 1.2kg / cm ² , temperature 90 ° C ) And heat-shrinked for 10 seconds. Table 2 shows the label shrink finish.

Example 3 The styrene-butadiene block copolymer used in Example 1 was used for the inner and outer layers (A) and (C).
Melt using two extruders so as to obtain 100 parts by weight of a graft type impact-resistant polystyrene resin (Asahi Kasei Polystyrene SS-700 manufactured by Asahi Kasei Kogyo Co., Ltd.) using another extruder. The mixed resin system obtained by mixing 20 parts by weight of the styrene-conjugated diene block elastomer used in Example 1 was melted so as to become the intermediate layer (B), and then (A) / (B) in one T die at 190 ° C. /
(C), melt-laminated, extruded from a T-die, and a draw ratio of 102
%, Temperature 90 ° C, stretching speed 17000% /
Stretched 1.5 times in the machine direction in 5 minutes and preheated at 120 ° C. for 5 seconds, then the first zone temperature was 100 ° C., the second zone temperature was 80 ° C., and the stretching speed was 3900% / min. .
After stretching the tenter ten times, annealing was performed in the vicinity of the tenter outlet while relaxing 1.3% in the width direction over a period of 4.0 seconds at a temperature of 70 ° C., followed by primary cooling with hot air at 40 ° C.゜ C
The sheet was subjected to secondary cooling with a cooling roll to obtain a heat-shrinkable film.
The thickness of this film is 3 μm for both the inner and outer layers (A) and (C).
m, the intermediate layer (B) was 54 μm, and the overall thickness was 60 μm. Table 1 shows the heat shrinkage and the natural shrinkage. Next, heat shrinkage was performed in the same manner as in Example 2. Table 2 shows the shrinkage finish of this label.

Comparative Example 1 A styrene homopolymer (MI5) was added to 100 parts by weight of a styrene-butadiene block copolymer having a styrene content of 80% by weight and a butadiene content of 20% by weight having a structure of (SJ) _3- S. ) The mixed resin system mixed with 12 parts by weight was melted using an extruder,
Extruded from a T die at ゜ C, taken up at a draw ratio of 101% using a take-up roll at 60 ° C,
After preheating for 3 seconds, the tenter is stretched 6.0 times in the transverse direction at a first zone temperature of 110 ° C., a second zone temperature of 95 ° C., and a stretching speed of 1230% / min.
Annealed while relaxing 0.2% in the width direction over 0 ° C for 5 seconds, primary cooling with hot air of 40 ° C, 30 ° C
The sheet was subjected to secondary cooling with a cooling roll to obtain a heat-shrinkable film.
The thickness of this film was 60 μm. Table 1 shows the heat shrinkage and the natural shrinkage. From Table 1, it can be seen that 80 in the main stretching direction
It can be seen that the heat shrinkage of ΔC is small and the natural shrinkage is large. Next, heat shrinkage was performed in the same manner as in Example 2. Table 2 shows the shrinkage finish of this label. The evaluation of the shrinkage of the neck and the top surface was x (insufficient shrinkage) because the heat shrinkage at 80 ° C. in the main stretching direction was small.

(Comparative Example 2) A styrene-butadiene block copolymer having a styrene content of 85% by weight and a butadiene content of 15% by weight having a structure of (SJ) _3- S was formed so as to form the inner and outer layers (A) and (C). Was melted using two extruders, and the other extruder was used to melt the graft-type impact-resistant polystyrene resin 10 used in Example 3.
A mixed resin system obtained by mixing 2 parts by weight of the styrene-conjugated diene block elastomer used in Example 1 with 0 parts by weight was melted so as to form an intermediate layer (B), and the mixture was formed in one T-die at 195 ° C. (A) / (B) / (C), extruded from a T-die, taken up at a draw ratio of 102% using a take-off roll at 40 ° C., at a temperature of 85 ° C., a stretching speed of 65000% / min. And then pre-heated at 105 ° C for 4 seconds, the first zone temperature was 90 ° C, the second zone temperature was 75 ° C, and the stretching speed was 42.
Tenter stretching in the transverse direction by 7.0% at a rate of 00% / min, annealing near the exit of the tenter at a temperature of 65 ° C. for 3 seconds while relaxing 0.5% in the width direction, and annealing at 30 ° C. The film was primarily cooled by hot air and then secondarily cooled by a cooling roll at 20 ° C. to obtain a heat-shrinkable film. The thickness of this film is 2 μm for both the inner and outer layers (A) and (C), 56 μm for the intermediate layer (B),
The total thickness was 60 μm. Table 1 shows the heat shrinkage and the natural shrinkage. Table 1 shows that the heat shrinkage and the natural shrinkage at 70 ° C. in the main stretching direction are large. Next, when the film was thermally shrunk in the same manner as in Example 2, the film slipped upward (toward the top surface) and could not be mounted at a predetermined position. This is because the heat shrinkage at 70 ° C. in the main stretching direction was too large.

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

The present invention is configured as described above.
The following effects are obtained.

According to the label made from the film of the present invention, from the body to the neck of the bottle having a very thin neck compared to the body, from the body to the top of the cap, from the bottom to the neck, or from the bottom. Even if it is heat shrunk to the top surface, at the predetermined position, the trunk, bottom, neck, top surface wrinkles,
A beautiful wearing body can be obtained without any abnormalities such as generation of avatars and insufficient shrinkage.

Further, if the label is stored for a long period of time, it naturally shrinks during that time and the diameter becomes small, so that there is no problem that it is difficult to mount the label when trying to mount it on the container.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bottle provided with a heat-shrinkable film (label) obtained in Examples 2 and 3.

[Explanation of symbols]

 1 Glass bottle 2 Heat shrinkable film (label)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 7:00 9:00 F term (Reference) 3E062 AA09 AB01 AC02 AC06 AC08 DA01 DA07 JA01 JB04 JC02 4F100 AK12A AK12B AK12C AK12J AK28A AK28B AK28C AK28J AK73 AL02A AL02B AL02C AL04A AL04B AL04C AL09A BA01 BA02 BA03 BA06 BA10B BA10C BA15 EH17 EJ38 GB16 JA03 JK10A JK10B JK10A JK10B JK10C YY00 4F210 AA13 RA01RG01 AG01 RG03

Claims (5)

[Claims] 1. A heat-shrinkage ratio of at least 70 ° C. × 1 in hot water comprising at least one layer containing a polystyrene resin.
A heat-shrinkable film having 5 to 22% at 0 seconds, 45% or more at 80 ° C x 10 seconds, and having a natural shrinkage in the main stretching direction of 40% at 7 days x 2.5% or less. 2. The method according to claim 1, wherein the film comprises an intermediate layer (B) containing at least one resin selected from the group consisting of polystyrene, impact-resistant polystyrene, and graft-type impact-resistant polystyrene, and a styrene-conjugated diene block copolymer. The inner and outer layers (A) and (C) include (A) / (B)
The heat-shrinkable film according to claim 1, which is a film including at least three layers laminated in the order of / (C). 3. The heat-shrinkable film according to claim 2, wherein the intermediate layer (B) is a layer further containing a styrene-conjugated diene block copolymer and / or a styrene-conjugated diene block elastomer. 4. The inner and outer layers (A) and (C) further comprise at least one selected from the group consisting of polystyrene, impact-resistant polystyrene, and graft-type impact-resistant polystyrene.
The heat-shrinkable film according to claim 2, which is a layer containing a kind of resin. 5. A container equipped with the heat-shrinkable film according to claim 1.