JP4845366B2 - Heat-shrinkable pore-containing film - Google Patents

Description

  The present invention relates to a heat-shrinkable pore-containing film, and more particularly to a heat-shrinkable pore-containing film having a small bulk specific gravity.

  Plastics have permeated every field of life and industry, and the world's annual production reaches about 100 million tons. However, most of them are discarded after use. In general, plastics are stable in the natural environment for a long time and have a low bulk specific gravity. Therefore, it has been pointed out that problems such as promoting the shortening of the life of landfills after disposal and impairing the natural landscape and the living environment of wild animals and plants. Yes.

  On the other hand, as the awareness of environmental conservation in recent years has risen, even if plastic is discarded in the natural environment, it will decompose and disappear over time, and ultimately will not adversely affect the natural environment. The use of plant-based plastics is being considered. This plant-derived plastic uses non-depleted raw materials, can save depleting resources during plastic production, and has excellent recyclability.

  Among the above plant raw material plastics, lactic acid-based resins are made from lactic acid obtained by fermentation of starch, can be mass-produced, and have excellent transparency, rigidity, heat resistance, and the like. Hereinafter, as an alternative material of “PS”) and polyethylene terephthalate (hereinafter referred to as “PET”), it has attracted attention in the field of film packaging and injection molding.

  On the other hand, as part of environmental measures in recent years, recycling of PET, which separates and collects plastic containers, particularly PET containers used for soft drinks, has become active. And, when recycling PET containers, etc., it is necessary to separate plastics of different materials. This separation method includes a liquid specific gravity method using a buoyancy difference against water, a wind specific gravity separation method using a specific gravity difference, etc. Is used.

  Currently, polyvinyl chloride (hereinafter referred to as “PVC”), PS resin, or PET resin is used for shrink wrapping, shrink labels, cap seals and the like used for PET containers and the like. When the PET containers equipped with these are separated by the liquid specific gravity method, the specific gravity of PET is about 1.4, whereas the specific gravity of PVC is 1.2 or more, and PS resin. Since the specific gravity of 1.03 to 1.06 is slightly heavier than water, the PET resin and the film used for the label and the like both sink in the water, and the PET resin is separated with high accuracy. Is impossible.

  For this reason, in order to make separation by the liquid specific gravity method easier, a material having a specific gravity of less than 1.0 is required as a shrink wrap, a shrink label, a cap seal or the like used for a PET container or the like. Examples of such materials include polyolefin resins such as polyethylene resins and polypropylene resins. A label using this polyolefin resin is studied in Patent Document 1 and the like.

  However, in this case, the sorted label becomes dust and causes the above-described problem. Therefore, it is conceivable to use the above plant raw material plastics, particularly lactic acid resins, as an alternative material for polyolefin resins. Moreover, by using plant raw material plastics as an alternative to petroleum-based resins, the use of biomass can be promoted and a recycling society can be aimed at.

  Patent Document 2 discloses a heat-shrinkable film using a polylactic acid-based resin composition, and Patent Document 3 shows a good result by mixing polylactic acid and an aliphatic-aromatic polyester. That exhibit excellent heat shrinkage characteristics.

JP 2002-194109 A JP-A-5-212790 JP 2003-119367 A

  However, fracture resistance is important in the manufacturing process of heat-shrinkable labels. That is, in a series of processes such as printing, bag making, thermal coating, and storage, if the film breaks, the productivity may be reduced, and if the film is cracked or cracked, the heat shrink label As a result, the destruction and scattering prevention ability is reduced. In general, the lactic acid resin does not have sufficient rupture resistance, and therefore, when the lactic acid resin is used as a heat-shrinkable label, the above-described problem occurs.

  On the other hand, it is known that bag breakability can be improved by adding a plasticizer or a rubber component to the lactic acid-based resin. In this case, the rigidity of the resulting film is reduced, and the coating step Thus, problems such as difficulty in covering a predetermined position occur.

  Furthermore, since the specific gravity of the lactic acid resin or polylactic acid and the aliphatic-aromatic polyester is 1.0 or more, the separation becomes difficult.

  Therefore, the present invention provides a heat-shrinkable film that can be separated from plastics for containers such as PET and the like by liquid density method without causing environmental problems, and has sufficient rigidity and fracture resistance. The purpose is to do.

The present invention comprises a resin composition in which the following component (A) and component (B) are mixed at a mass ratio of (A) :( B) = 90 to 60:10 to 40, preferably, the component (A). The domain formed by the component (B) in the phase extends in one direction, and the resin composition having an aspect ratio of 5 to 50 is at least uniaxially, preferably by the component (B). The above-mentioned problems have been solved by using a heat-shrinkable pore-containing film having a bulk specific gravity of 0.50 to 0.99 by stretching in a direction perpendicular to the direction in which the formed domain is stretched. It is.
(A) component: lactic acid resin composition having a Vicat softening point of 50 to 95 ° C. (B) component: incompatible with the above component (A) and a storage elastic modulus at 80 ° C. of 0.25 to 2 GPa, Preferably, the polyolefin resin composition having a melt flow rate of 1.0 to 5.0 g / 10 min.

  Since the heat-shrinkable pore-containing film according to the present invention has a bulk specific gravity of 0.50 to 0.99, it can be separated from a plastic having a specific gravity of 1.0 or more and a liquid specific gravity method for containers such as PET. .

  Moreover, since the resin composition which mixed predetermined (A) component and (B) component by the predetermined ratio is used, sufficient rigidity and fracture resistance can be provided.

  Furthermore, since the heat-shrinkable pore-containing film contains a lactic acid resin composition as a main component, it does not cause environmental problems.

  The heat-shrinkable pore-containing film according to the present invention is a film having pores obtained by stretching a resin composition obtained by mixing the following components (A) and (B) in at least one axial direction. is there.

The component (A) refers to a predetermined lactic acid resin composition.
The lactic acid-based resin composition is a polymer of lactic acid, specifically, a homopolymer having a structural unit of L-lactic acid or D-lactic acid, that is, poly (L-lactic acid) or poly (D-lactic acid), or , A copolymer having a structural unit having both L-lactic acid and D-lactic acid, that is, a composition containing poly (DL-lactic acid) or a lactic acid resin mainly composed of a mixture thereof, or the above L -A composition containing a lactic acid-based copolymer containing as a main component a copolymer of lactic acid or D-lactic acid and an α-hydroxycarboxylic acid and / or a diol component and a dicarboxylic acid component other than lactic acid.

  As the polymerization method of the lactic acid resin, known methods such as a condensation polymerization method and a ring-opening polymerization method can be employed. For example, in the condensation polymerization method, polylactic acid having an arbitrary composition can be obtained by directly dehydrating condensation polymerization of L-lactic acid, D-lactic acid or a mixture thereof.

  Further, in the ring-opening polymerization method (lactide method), lactide which is a cyclic dimer of lactic acid is subjected to ring-opening polymerization in the presence of a predetermined catalyst while using a polymerization regulator or the like as required. A lactic acid resin having a composition can be obtained.

  The lactide includes L-lactide, which is a dimer of L-lactic acid, D-lactide, which is a dimer of D-lactic acid, and DL-lactide, which is a dimer of D-lactic acid and L-lactic acid. These may be mixed and polymerized as necessary to obtain polylactic acid having an arbitrary composition and crystallinity.

  Furthermore, non-aliphatic diols such as a non-aliphatic carboxylic acid such as terephthalic acid and an ethylene oxide adduct of bisphenol A may be used as a small amount of a copolymer component as required to improve heat resistance. Furthermore, for the purpose of increasing the molecular weight, a small amount of a chain extender such as a diisocyanate compound, an epoxy compound, or an acid anhydride may be used.

  Examples of the other hydroxycarboxylic acid unit used as a monomer of the lactic acid copolymer include glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 2-hydroxy-n-butyric acid, 2-hydroxy-3, Examples thereof include bifunctional aliphatic hydroxycarboxylic acids such as 3-dimethylbutyric acid, 2-hydroxy-3-methylbutyric acid, 2-methyllactic acid, and 2-hydroxycaproic acid, and lactones such as caprolactone, butyrolactone, and valerolactone.

  Examples of the diol used as the monomer for the lactic acid copolymer include ethylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol and the like. Examples of the dicarboxylic acid include succinic acid, adipic acid, suberic acid, sebacic acid and dodecanedioic acid.

  A preferable range of the weight average molecular weight of the lactic acid resin or lactic acid copolymer contained in the lactic acid resin composition is 50,000 to 400,000, and a more preferable range is 100,000 to 250,000. When it is below this range, practical physical properties are hardly expressed, and when it exceeds, the melt viscosity is too high and the molding processability is poor.

  The Vicat softening point of the lactic acid-based resin composition requires 50 to 95 ° C, and preferably 55 to 85 ° C. If it is lower than 50 ° C., if the heat-shrinkable pore-containing film obtained is left at a temperature slightly higher than room temperature, for example, in summer, the natural shrinkage that this film shrinks before use tends to increase. It tends to be a film lacking stability. On the other hand, if it is higher than 95 ° C., it becomes difficult to stretch at low temperature during stretching, and as a result, it tends to be difficult to obtain good shrinkage characteristics.

  The composition ratio of D-lactic acid and L-lactic acid constituting the lactic acid resin or lactic acid copolymer constituting the lactic acid resin composition is not particularly limited, but L-lactic acid: D-lactic acid = 99.5. : 0.5 to 85:15 or 0.5: 99.5 to 15:85 is preferable. If the ratio of L-lactic acid or D-lactic acid exceeds 99.5%, shrinkage unevenness is likely to occur, and if it is less than 85%, it is difficult to obtain sufficient shrinkage characteristics depending on the shrinkage conditions.

  The component (B) refers to a composition containing a predetermined polyolefin resin that is incompatible with the component (A). Examples of such polyolefin resins include polyethylene, polypropylene such as highly crystalline homopolypropylene, polymethyl terpene, or a mixed resin thereof. Since the specific gravity of the polyolefin resin used as the component (B) is small, the specific gravity of the film obtained from the mixed resin composition of the component (A) and the component (B) is also higher than that of the component (A) alone. Can be lowered.

  Moreover, since the said (B) component is incompatible with (A) component, when both mixed resin composition is formed into a film, it takes a sea-island structure. As will be described later, since there are many components (A), (A) component forms a sea part, that is, a matrix, and (B) component forms an island part. (B) component region, that is, forms a domain. To do.

  The storage elastic modulus at 80 ° C. when measured at a frequency of 10 Hz and a strain of 0.1% of the component (B) is 0.25 to 2 GPa, preferably 0.4 to 2 GPa. If it is less than 0.25 GPa, it is difficult to generate pores in the film by stretching, which will be described later. In addition, it is difficult to obtain such a resin itself.

  The mixing ratio of the component (A) and the component (B) is a mass ratio, and (A) :( B) = 90-60: 10-40 is required, and 80-70: 20-30 is preferable. As described above, in the resin composition in which the component (A) and the component (B) are mixed, the component (A) forms a matrix and the component (B) forms a domain. For this reason, within this range, this sea-island structure can be formed, and by stretching, it becomes possible to cause separation at the interface between the matrix and the domain and to form pores. . When the component (B) is less than 10% by mass, the amount of the pores formed is small, and the film may have a bulk specific gravity of 1.0 or more after being stretched. On the other hand, when it is more than 40% by mass, the sea-island structure may not be sufficiently formed, or the mechanical properties of the obtained film may be insufficient and become brittle.

  In the mixed resin composition in which the component (A) and the component (B) are mixed, a plasticizer, a heat stabilizer, an antioxidant, and a UV absorber as long as the effects of the present invention are not impaired. Additives such as light stabilizers, pigments, colorants, lubricants, nucleating agents, and hydrolysis inhibitors may be added.

  The mixed resin composition obtained by mixing the component (A) and the component (B) is formed into a film. Specifically, first, as a method for mixing the components (A) and (B), there is a method for obtaining a pre-compound using a same-direction twin-screw extruder, a kneader, a Henschel mixer, or the like. Moreover, you may throw in into a film extruder directly, without mixing both components beforehand.

  Next, the component (A) and the component (B) or a mixture of these components are put into an extruder and extruded. As an extrusion method, any method such as a T-die method or a tubular method can be adopted. The melt-extruded film is cooled with a cooling roll, air, water, etc., and then reheated by a method such as hot air, warm air, ultraviolet rays, carbon dioxide laser, microwave, roll method, tenter method, tubular method, etc. By stretching in at least one direction, that is, uniaxially or biaxially, peeling occurs at the interface between the matrix and the domain to form pores, and the heat-shrinkable pore-containing film according to the present invention is obtained. Can do. Whether the stretching is uniaxial stretching or biaxial stretching is determined by the intended application.

  The stretching temperature varies depending on the softening temperature of the component (A) and the component (B), the use of the heat-shrinkable pore-containing film to be obtained, and the like, but is preferably 60 to 80 ° C, and preferably 60 to 70 ° C. If it is less than 60 ° C., the elastic modulus of the material in the stretching process becomes too high and the stretchability is lowered, so that stretching tends to become unstable, such as film breakage or thickness spots. On the other hand, if it exceeds 80 ° C., the desired shrinkage characteristics may not be sufficiently exhibited, and the stretchability of the component (B) is improved, and peeling at the interface between the matrix and the domain is less likely to occur. There is a possibility that voids may occur, and as a result, the bulk specific gravity may be 1.0 or more.

  The draw ratio in the drawing step can be selected according to the composition of the mixed resin composition in which the components (A) and (B) are mixed, the drawing means, the drawing temperature, the desired product form, and the like. 1.5 to 8 times, preferably 3 to 6 times. If it is less than 1.5 times, appropriate shrinkage characteristics may not be obtained, and sufficient pores may not be generated, and the bulk specific gravity may be 1.0 or more. On the other hand, it may exceed 8 times, but 8 times is sufficient in actual performance.

  In the case of primary stretching, if necessary, if the film is weakly stretched about 1.01 to 1.8 times in the flow direction of the film, the mechanical properties of the resulting heat-shrinkable pore-containing film are improved. It is more preferable.

  By the way, since the cooling roll used in the film manufacturing process exists below the extruder, the film extruded from the extruder is slightly stretched by its own weight before going to the cooling roll. Become. At this time, since the film is in the stage of exiting the extruder, it is in a high temperature state, and not only the matrix constituting the film but also the domains are extended in the flow direction, and in particular, the domains are extended in the flow direction. In this case, the aspect ratio of the domain is preferably 5 to 50, and more preferably 10 to 40. By satisfying this range, when the film alone is formed by the component (A), it is brittle, but by including a domain having the aspect ratio, the resulting heat-shrinkable void-containing film can be obtained at a low temperature. It is possible to impart the rupture resistance. For this reason, if the aspect ratio is smaller than 5, the fracture resistance at low temperatures may be impaired. On the other hand, when it is larger than 50, voids are hardly generated and a desired bulk specific gravity cannot be obtained.

  The aspect ratio is preferably generated by the above-described method based on its own weight, but this may not be sufficient. In such a case, it is good to stretch a little between said extruder and a cooling roll. That is, by changing the thickness of the stretched film to be formed with respect to the interval (lip gap) of the extrusion die of the extruder, the film is stretched in the flow direction, and the aspect ratio of the domain is controlled by the ratio. Is possible.

  As described above, when the domain has a predetermined aspect ratio, the domain is parallel to the outer surface of the film and extends in one direction, that is, the flow direction of the film. Therefore, by making the stretching direction of the uniaxial stretching or one stretching direction of the biaxial stretching a direction perpendicular to the flow direction, it becomes easier to cause separation of the boundary between the matrix and the domain, And a higher porosity can be obtained.

  In order to realize the domain aspect ratio as described above, the component (B) preferably has a melt flow rate of 1.0 to 5.0 g / 10 min, and preferably 1.5 to 5 g / 10 min. More preferred. If it is smaller than 1.0 g / 10 min, the domain size tends to be large when the above-mentioned sea-island structure is formed, and the dispersion state is poor and the voids tend not to be uniformly generated. When doing so, the desired bulk specific gravity may not be obtained. On the other hand, if the size is larger than 5.0 g / 10 min, the domain size tends to be small when the above-mentioned sea-island structure is formed, and the strength of the domain itself is low, so that the fracture resistance at low temperature cannot be sufficiently provided. There is.

  The bulk specific gravity of the heat-shrinkable pore-containing film according to the present invention needs to be 0.50 to 0.99. If it exceeds 0.99, it will be difficult to separate this film by the liquid density method, and separation may be impossible. On the other hand, if it is less than 0.50, the strength of the film becomes insufficient due to the existing pores, which tends to cause a problem in practical use.

  The heat shrinkage rate of the heat-shrinkable pore-containing film according to the present invention at 80 ° C. for 10 seconds is preferably 20% or more, and preferably 25% or more in the main shrinkage direction. If it is less than 20%, appropriate shrinkage characteristics may not be obtained. In addition, the upper limit with preferable heat shrinkage is a ratio which shrink | contracts to the length before said stretching. This is because the film does not shrink beyond the length before stretching.

  Since the heat-shrinkable pore-containing film according to the present invention has heat-shrinkability, it can be used as a heat-shrink label or the like. When the heat-shrinkable pore-containing film according to the present invention is used as a heat-shrink label or the like, it is in a deflated state when recycled. For this reason, it is preferable that the heat-shrinkable pore-containing film according to the present invention can be separated by a liquid specific gravity method even after heat shrinkage. Specifically, the bulk specific gravity after 25% thermal shrinkage at 80 ° C. is preferably 0.50 to 0.99. If it exceeds 0.99, it will be difficult to separate this film by the liquid density method, and separation may be impossible. On the other hand, if it is less than 0.50, the film itself before heat shrinkage tends to become a problem in practice due to insufficient strength due to pores present in the film.

  Hereinafter, the present invention will be described in detail with reference to experimental examples and comparative examples, but the present invention is not limited thereto. In addition, the physical-property value and evaluation in an experiment example and a comparative example measured and evaluated by the following method. Here, the film take-up (flow) direction is described as MD, and the direction orthogonal thereto is described as TD.

(Measurement method and evaluation method)
[Bulk specific gravity]
A film to be measured was accurately cut into a length and width of 10 cm, weighed w (g), measured at a thickness t (μm) of 50 points of the film, and a bulk specific gravity (g / cm ³ ) was calculated by the following formula. .
Bulk specific gravity = (w / (t × 10 ⁻⁴ × 10 × 10))
= (W / t) x 100

[Bulk specific gravity after heat shrink]
The film to be measured was shrunk by 25% at 80 ° C., and then finely crushed, and whether it floated and floated on water (whether the bulk specific gravity was less than 0.99 g / cm ³ ) was determined according to the following criteria.
○: When everything floats △: When there is something that floats and sinks, or when there is something floating in the water ×: When everything sinks

[Vicat softening point]
Using a lactic acid resin composition, a plate material of L200 mm × W3 mm × t3 mm was injection molded using an injection molding machine IS50E (screw diameter 25 mm) manufactured by Toshiba Machine Co., Ltd. The main molding conditions are as follows. Using the plate material obtained by injection molding, the Vicat softening point was measured according to JIS K 7206A method.
-Temperature conditions: Cylinder temperature: 195 ° C, mold temperature: 20 ° C
・ Injection conditions: injection pressure: 115 MPa, holding pressure: 55 MPa
・ Measuring conditions: Screw rotation speed: 65 rpm, back pressure: 15 MPa

[Melt flow rate]
Measurement was performed using a melt indexer (120 SAS-2000) manufactured by Yasuda Seiki Seisakusho in accordance with JIS K 7210 (measurement temperature: 230 ° C., load: 21.18 N).

[aspect ratio]
The aspect ratio of the domain consisting of the component (B) that is incompatible with the component (A) in the film to be measured is cut out with a microtome in the longitudinal and lateral cross-sectional directions, and observed at 10 points with an electron microscope. The ratio (major axis / minor axis) was calculated.

[Tensile elongation]
In accordance with JIS K 6732, the tensile elongation in the machine direction of the film at an atmospheric temperature of 0 ° C. was measured at a tensile speed of 100 mm / min.

[Heat shrinkage]
The film to be measured was cut into a size of 100 mm in length and 100 mm in width, immersed in an 80 ° C. hot water bath for 10 seconds, and the amount of shrinkage was measured. The thermal shrinkage rate was expressed as a percentage of the shrinkage amount relative to the original size before shrinkage.

[Dynamic viscoelasticity measurement]
A 200 μm film was prepared using a polyolefin resin to be measured, then cut into a size of 4 mm in width and 60 mm in length, and vibration was made using a viscoelastic spectrometer (made by IT Measurement Co., Ltd .: DVA-200). Measurement was performed in the TD direction at a frequency of 10 Hz, a strain of 0.1%, a heating rate of 1 ° C./min, a chuck spacing of 2.5 cm, and a measurement temperature of 40 to 150 ° C. And the storage elastic modulus in 80 degreeC was measured.

(raw materials)
[(A) component: lactic acid resin]
Lactic acid-based resin 1: Cargill Dow Co., Ltd .: NatureWorks 4032D, L-lactic acid / D-lactic acid = 99/1, weight average molecular weight: 200,000, Vicat softening point: 60 ° C., hereinafter abbreviated as “PLA1”.
Lactic acid-based resin 2: Cargill Dow Co., Ltd .: NatureWorks 4060D, L-lactic acid / D-lactic acid = 85/15, weight average molecular weight: 200,000 or less, Vicat softening point: 60 ° C., abbreviated as “PLA2”.

[(B) component: olefin resin]
Olefin resin 1: Nippon Polypro Co., Ltd .: Polypropylene resin: FY6H, melt flow rate: 1.9 g / 10 min, hereinafter abbreviated as “PO1”.
Olefin resin 2: Nippon Polypro Co., Ltd .: Polypropylene resin: FB3GT, melt flow rate: 7.0 g / 10 min, hereinafter abbreviated as “PO2”.
Olefin resin 3: Nippon Polypro Co., Ltd .: Polypropylene resin: EA9, melt flow rate: 0.5 g / 10 min, hereinafter abbreviated as “PO3”.

[Others]
-Talc ... Nippon Talc Co., Ltd. product: SG-95 (average particle diameter: 2.5 micrometers), hydrous magnesium silicate

(Examples 1-4, Comparative Examples 1-4)
Each resin was dry blended at the ratio shown in Table 1, manufactured by Mitsubishi Heavy Industries, Ltd .: Kneaded at 200 ° C. and 100 rpm using a small same-direction twin-screw extruder (40 mmφ), extruded into a strand, and rapidly cooled in a water bath Thereafter, the strand was cut to obtain pellets.
The obtained pellets were manufactured by Mitsubishi Heavy Industries, Ltd. equipped with a 90 mmφ single-screw extruder: successively subjected to a biaxially stretched film tenter and stretched 3.5 times at a lip gap of 1 mm, an extrusion temperature of 200 ° C., and a stretching temperature of 65 ° C. As a result, a 50 μm heat-shrinkable pore-containing film was obtained. Said measurement and evaluation were performed about the heat shrinkable void | hole containing film. The results are shown in Table 1.

Claims (3)

A resin composition obtained by mixing the following component (A) and component (B) at a mass ratio of (A) :( B) = 90-60: 10-40 is 1.5 in the direction perpendicular to the film flow direction. By stretching from 1.01 times to 1.8 times in the film flow direction, the bulk specific gravity is set to 0.50 to 0.99,
A heat-shrinkable pore-containing film having a heat shrinkage rate of 20% or more in the main shrinkage direction at 80 ° C. for 10 seconds and a bulk specific gravity of 0.99 or less after 25% heat shrinkage at 80 ° C. .
(A) component: lactic acid resin composition having a Vicat softening point of 50 to 95 ° C. (B) component: incompatible with the above component (A) and a storage elastic modulus at 80 ° C. of 0.25 to 2 GPa, Polypropylene resin composition having a melt flow rate of 1.0 to 5.0 g / 10 min The following (A) component and (B) component are mixed at a mass ratio of (A) :( B) = 90-60: 10-40, and the (B) component in the phase comprising the (A) component The domain that is the component region (B) formed is elongated in one direction, and the domain formed by the component (B) is elongated in the resin composition having an aspect ratio of 5 to 50 The film is stretched 1.5 to 8 times in the direction perpendicular to the film flow direction, which is a direction perpendicular to the direction, and 1.01 or more times in the film flow direction in which the domains extend. By stretching to 1.8 times or less, the bulk specific gravity is 0.50 to 0.99,
A heat-shrinkable pore-containing film having a heat shrinkage rate of 20% or more in the main shrinkage direction at 80 ° C. for 10 seconds and a bulk specific gravity of 0.99 or less after 25% heat shrinkage at 80 ° C. .
(A) Component: A lactic acid resin composition having a Vicat softening point of 50 to 95 ° C. (B) Component: Polypropylene that is incompatible with the above component (A) and has a storage elastic modulus at 80 ° C. of 0.25 to 2 GPa. Resin composition Claim 1 or 2 heat shrinkable voids containing film soft drink containers with a heat-shrinkable label is attached consisting described.