Biomass shrink film and multilayer shrink film

Abstract

To provide a biomass shrink film having excellent transparency and strength while enhancing heat shrinkability even when a polyethylene having a high degree of biomass is used.SOLUTION: There is provided a biomass shrink film which comprises a first polyethylene having a density of 0.920 to 0.935 g / cm3, a second polyethylene having a density of 0.890 g / cm3 or more and less than 0.920 g / cm3, silica dioxide and a glycerin fatty acid ester, contains the first polyethylene and the second polyethylene in a mass ratio of 10:90 to 60:40, wherein the second polyethylene has a degree of biomass of 39.2% or less, the heat shrinkage rate at 100°C as measured in accordance with JIS Z1709 is 45% or more in the MD direction, the haze value measured in accordance with JIS K7136 is 20% or less and the degree of biomass of the entire biomass shrink film is 45% or more.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a biomass shrink film and a multilayer shrink film.

Background Art

[0002] Conventionally, as a heat-shrinkable packaging material, a shrink film (heat-shrinkable film) mainly composed of a polyethylene-based resin has been known. The shrink film for packaging can package a plurality of products simultaneously regardless of the shape and size of the object to be packaged. In addition, since the polyethylene-based shrink film has transparency, it is easy to visually confirm the quality of the obtained packaged product.

[0003] Here, in recent years, due to efforts to address global environmental problems, biomass materials have attracted attention. Biomass materials are derived from plants, and since their carbon source utilizes carbon dioxide in the atmosphere, they can be said to be environmentally considerate from the perspective of carbon neutrality.

[0004] Patent Document 1 discloses a polyolefin-based heat-shrinkable film containing plant-derived polyethylene. Specifically, it is a polyolefin-based heat-shrinkable film containing 80 to 95% by weight of low-density polyethylene and 5 to 20% by weight of linear low-density polyethylene, and is characterized in that 5% by weight or more of the low-density polyethylene is plant-derived low-density polyethylene. And Patent Document 1 discloses that the biomass degree (bio-based degree) of the heat-shrinkable film is at most 28.5%.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, even when trying to produce a shrink film with a high bio-based content using biomass polyethylene, the resulting film had a problem of insufficient heat shrinkage at low temperatures. In addition, the bio-based content of the heat shrinkable film of Patent Document 1 is about 28.5% at maximum, and a shrink film with a further improved bio-based content is required.

[0007] The present invention has been made in view of the problems of such conventional technologies. And the object of the present invention is to provide a biomass shrink film and a multilayer shrink film that are excellent in transparency and strength while enhancing heat shrinkability even when using polyethylene with a high bio-based content.

Means for Solving the Problems

[0008] The biomass shrink film according to the first aspect of the present invention is a biomass shrink film containing a first polyethylene having a density of 0.920 to 0.935 g / cm 3 a second polyethylene having a density of 0.890 g / cm 3 or more and less than 0.920 g / cm 3 silicon dioxide, and glycerin fatty acid ester, wherein the first polyethylene and the second polyethylene are included in a mass ratio of 10:90 to 40:60, the bio-based content of the second polyethylene is 39.2% or less, the heat shrinkage rate at 100 °C measured according to JIS Z1709 is 45% or more in the MD direction, the haze value measured according to JIS K7136 is 20% or less, and the bio-based content of the entire biomass shrink film is 45% or more.

[0009] The biomass shrink film according to the second aspect of the present invention is a first polyethylene having a density of 0.920 to 0.935 g / cm 3 a second polyethylene having a density of 0.890 g / cm 3 or more and less than 0.920 g / cm 3A biomass shrink film comprising a second polyethylene having a density less than that of the first polyethylene, silicon dioxide having an average particle diameter of 0.1 μm or less, and a glycerin fatty acid ester, wherein the first polyethylene and the second polyethylene are included in a mass ratio of 10:90 to 40:60, 0.5 to 5 parts by mass of the silicon dioxide is included based on 100 parts by mass in total of the first polyethylene and the second polyethylene, 0.5 to 3 parts by mass of the glycerin fatty acid ester is included, the bio-based degree of the second polyethylene is 39.2% or less, and the bio-based degree of the entire biomass shrink film is 45% or more.

[0010] The multilayer shrink film according to the third aspect of the present invention includes the above-described biomass shrink film.

Advantages of the Invention

[0011] According to the present invention, even when polyethylene with a high bio-based degree is used, it is possible to provide a biomass shrink film and a multilayer shrink film that have excellent transparency and strength while enhancing heat shrinkability.

Modes for Carrying Out the Invention

[0012] Hereinafter, the biomass shrink film and the multilayer shrink film according to the present embodiment will be described in detail.

[0013] The biomass shrink film according to the present embodiment has a first polyethylene having a density of 0.920 to 0.935 g / cm 3 and a second polyethylene having a density of 0.890 g / cm 3 or more and 0.920 g / cm 3It contains a second polyethylene with a density lower than a certain value. Generally, polyethylene with a high density has low transparency but a high heat shrinkage rate. On the contrary, polyethylene with a low density has high transparency but a low heat shrinkage rate. Therefore, in the biomass shrink film of this embodiment, by mixing the second polyethylene with a low density and the first polyethylene with a density higher than that of the second polyethylene, in addition to transparency, the heat shrinkability is enhanced.

[0014] The first polyethylene is polyethylene with a density of 0.920 - 0.935 g / cm 3 Note that as the first polyethylene, it is preferable to use low-density polyethylene (LDPE) with a density of 0.920 - 0.935 g / cm 3

[0015] The first polyethylene preferably contains plant-derived polyethylene, and more preferably consists of plant-derived polyethylene. When the first polyethylene is plant-derived polyethylene, the bio-based degree of the resulting shrink film can be increased. Examples of such first polyethylene consisting of plant-derived polyethylene include, for example, low-density polyethylene, STN7006 (density 0.924 g / cm 3 , bio-based degree 95%) manufactured by Braskem.

[0016] In addition, in the biomass shrink film of this embodiment, when the bio-based degree of the entire biomass shrink film exceeds 45%, the first polyethylene may contain petroleum-derived polyethylene in addition to plant-derived polyethylene. Examples of such petroleum-derived first polyethylene include, for example, high-pressure low-density polyethylene, SumikaSen (registered trademark) F-208-3 (density 0.924 g / cm 3 ) manufactured by Sumitomo Chemical Co., Ltd., and film-grade LDPE, NUC8230 (density 0.928 g / cm 3 ) manufactured by ENEOS NUC Co., Ltd.

[0017] ​The second polyethylene has a density of 0.890 g / cm 3 or more and less than 0.920 g / cm 3 . As the second polyethylene, a linear low-density polyethylene (LLDPE) with a density of 0.890 g / cm 3 or more and less than 0.920 g / cm 3 is preferably used.

[0018] The second polyethylene contains plant-derived polyethylene. By including plant-derived polyethylene in the second polyethylene, the bio-based degree of the resulting shrink film can be increased. Examples of the second polyethylene made of such plant-derived polyethylene include Braskem's linear low-density polyethylene, SLL118 (density 0.916 g / cm 3 , bio-based degree 87%), and Braskem's linear low-density polyethylene, SLH118 (density 0.916 g / cm 3 , bio-based degree 87%).

[0019] In the biomass shrink film of this embodiment, when the bio-based degree of the entire biomass shrink film exceeds 45%, the second polyethylene may contain petroleum-derived polyethylene in addition to plant-derived polyethylene. Examples of such petroleum-derived second polyethylene include Sumitomo Chemical Co., Ltd.'s Sumika Excel (registered trademark) EFV103 (density 0.903 g / cm 3 ), Sumika Excel EFV203N (density 0.913 g / cm 3 ), and Ube Maruzen Polyethylene Co., Ltd.'s metallocene catalyst LLDPE, Yumelite (registered trademark) 1520F (density 0.913 g / cm 3 ).

[0020] In the biomass shrink film of this embodiment, the mass ratio of the first polyethylene to the second polyethylene is preferably 10:90 to 40:60. When the first polyethylene is 10 to 40 parts by mass and the second polyethylene is 90 to 60 parts by mass, a biomass shrink film excellent in heat shrinkability at low temperature can be obtained while increasing the bio-based degree of the whole film.

[0021] In addition to the first polyethylene and the second polyethylene, the biomass shrink film of this embodiment contains silicon dioxide with a very small particle size. When manufacturing a shrink film with a high bio-based degree using biomass polyethylene, the heat shrinkability at low temperature may decrease. However, silicon dioxide with a very small particle size imparts the effect of thixotropy (lowering viscosity) when processing polyethylene. Therefore, it is considered that the maximum temperature during polyethylene processing can be lowered, enabling low-temperature processing of polyethylene, and thus the cooling time to the melting point can be shortened. Also, it is considered that the silicon dioxide improves crystallization by supplementing the role of a nucleating agent. Therefore, by adding fine particles of silicon dioxide to the first polyethylene and the second polyethylene, a biomass shrink film with good heat shrinkability at low temperature can be obtained even when the bio-based degree is increased.

[0022] The average particle size of the silicon dioxide is preferably 0.1 μm or less, and more preferably 0.05 μm or less. The average particle size of the silicon dioxide can be measured by observing with observation means such as a scanning electron microscope (SEM) or a transmission electron microscope (TEM) for the shrink film.

[0023] Silicon dioxide is preferably fumed silica obtained by vaporizing silicon chloride and then subjecting it to a gas-phase reaction in a high-temperature hydrogen flame to synthesize silica fine particles. Examples of such silicon dioxide include hydrophilic fumed silica manufactured by Nippon Aerosil Co., Ltd., AEROSIL (registered trademark) 200, dry silica (fumed silica) manufactured by Tokuyama Corporation, Reolosil (registered trademark) QS102, and amorphous hydrophilic fine powder silica manufactured by Asahi Kasei Wacker Silicone Corporation, HDK (registered trademark) N20.

[0024] In the biomass shrink film of the present embodiment, the content of silicon dioxide is preferably 0.5 to 5 parts by mass with respect to a total of 100 parts by mass of the first polyethylene and the second polyethylene. When the content of silicon dioxide is 0.5 parts by mass or more, as described above, it becomes possible to improve the heat shrinkage rate of the obtained shrink film. Further, when the content of silicon dioxide is 5 parts by mass or less, it becomes possible to ensure the transparency of the obtained shrink film.

[0025] The biomass shrink film of the present embodiment contains glycerin fatty acid ester in addition to the first polyethylene, the second polyethylene, and silicon dioxide. Glycerin fatty acid ester is considered to act as an internal lubricant for polyethylene and assist in linearizing the polymer in the amorphous part during stretching. Therefore, even when the bio-based degree is increased, a decrease in the heat shrinkage rate of the obtained biomass shrink film can be suppressed.

[0026] The glycerin fatty acid ester is preferably glycerin monostearate. Examples of such glycerin fatty acid ester include Rikemal (registered trademark) S-100 manufactured by Riken Vitamin Co., Ltd. and Leodol (registered trademark) MS-60 manufactured by Kao Corporation.

[0027] In the biomass shrink film of this embodiment, the content of the glycerin fatty acid ester is preferably 0.5 to 3 parts by mass with respect to a total of 100 parts by mass of the first polyethylene and the second polyethylene. When the content of the glycerin fatty acid ester is 0.5 part by mass or more, as described above, it becomes possible to improve the heat shrinkage rate of the obtained biomass shrink film. Further, when the content of the glycerin fatty acid ester is 3 parts by mass or less, it becomes possible to ensure the strength of the obtained biomass shrink film.

[0028] Since the glycerin fatty acid ester acts as an internal lubricant as described above, if the blending amount is excessive, the processability may decrease, and the tensile strength of the obtained shrink film may also decrease. However, by adding silicon dioxide after setting the content of the glycerin fatty acid ester to 3 parts by mass or less, the thixotropy of the silicon dioxide assists the action as an internal lubricant during film processing. Therefore, due to these synergistic effects, the entanglement of polyethylene molecules is loosened, and the linearization of the polymer in the amorphous part is assisted during stretching, so that a decrease in the heat shrinkage rate of the obtained shrink film can be suppressed.

[0029] In addition, the biomass shrink film of this embodiment may contain an additive in addition to the above components. As the additive, a lubricant, an antioxidant, an ultraviolet absorber, an antistatic agent, an antifogging agent, a flame retardant, a colorant, etc. can be used. These components may be used alone or in combination of two or more.

[0030] The thickness of the biomass shrink film of this embodiment is not particularly limited, but is preferably, for example, 50 μm to 150 μm. When the thickness is 50 μm or more, the strength of the shrink film can be increased. Further, when the thickness is 150 μm or less, the heat shrinkability of the shrink film can be increased. In addition, when the thickness of the biomass shrink film is 50 μm to 150 μm, it can be suitably used, for example, for packaging a bundle of electric wires or cables with a weight of 8 to 40 kg.

[0031] The biomass shrink film of this embodiment preferably has a bio-based degree of 45% or more throughout the film. Conventionally, when manufacturing a shrink film with a high bio-based degree, the heat shrinkability at low temperatures sometimes decreased. However, in this embodiment, since silicon dioxide and glycerin fatty acid ester are added to the first polyethylene and the second polyethylene, even if the bio-based degree is increased, it is possible to suppress the decrease in shrinkability at low temperatures. Further, by setting the bio-based degree of the biomass shrink film to 45% or more, the amount of carbon dioxide reduction increases, so it is environmentally considerate.

[0032] In the biomass shrink film of this embodiment, the bio-based degree of the second polyethylene is preferably 39.2% or less. By the bio-based degree of the second polyethylene being 39.2% or less, it becomes possible to improve the heat shrinkability of the biomass shrink film.

[0033] Note that the bio-based degree can be determined according to ISO 16620-2, ISO 16620-3, ISO 16620-4, or ASTM6866. However, in this specification, it is preferable that the bio-based degree is determined according to ISO 16620-4.

[0034] The biomass shrink film of this embodiment preferably shrinks in at least one direction when heated. Specifically, when heated, the shrink film preferably shrinks in at least one of the MD (Machine Direction) and TD (Traverse Direction).

[0035] In addition, the biomass shrink film of the present embodiment preferably has a heat shrinkage rate at 100°C measured in accordance with JIS Z1709 of 45% or more in at least one of the MD direction and the TD direction, and preferably 45% or more in the MD direction. Since the biomass shrink film of the present embodiment is excellent in heat shrinkability at low temperatures, it can be suitably used, for example, for packaging bundles of electric wires or cables.

[0036] The biomass shrink film of the present embodiment may be a single layer. Further, it may be a multilayer shrink film in which the biomass shrink film and another film are laminated. Specifically, the multilayer shrink film of the present embodiment includes at least the above-described biomass shrink film. Further, the multilayer shrink film may be formed by laminating a plurality of layers of the above-described biomass shrink film. Furthermore, the multilayer shrink film may be formed by laminating the above-described biomass shrink film and another shrink film. The other shrink film is not particularly limited, and examples thereof include polyolefin-based shrink films.

[0037] The method for manufacturing the biomass shrink film of the present embodiment is not particularly limited. For example, first, a resin composition is prepared by melt-kneading the above-described resin components. The melt-kneading can be performed using a known kneader such as an extruder, a Banbury mixer, a kneader, or a roll mill. When kneading the first polyethylene and the second polyethylene with a kneader, silicon dioxide, glycerin fatty acid ester, and other additives can be added. Further, silicon dioxide, glycerin fatty acid ester, and other additives may be processed in a masterbatch state in advance. Then, when kneading the first polyethylene and the second polyethylene with a kneader, the resin composition may be prepared by adding and kneading the masterbatch.

[0038] Then, the obtained resin composition is formed into a film by, for example, an inflation (tubular) molding method or a T-die film extrusion molding method, whereby the biomass shrink film of the present embodiment can be obtained.

[0039] Thus, the biomass shrink film of the present embodiment comprises a first polyethylene having a density of 0.920 to 0.935 g / cm 3 and a second polyethylene having a density of 0.890 g / cm 3 or more and less than 0.920 g / cm 3 and silicon dioxide and glycerin fatty acid ester. And the first polyethylene and the second polyethylene are included in a mass ratio of 10:90 to 40:60. In the biomass shrink film, the bio-based degree of the second polyethylene is 39.2% or less. The biomass shrink film has a heat shrinkage rate at 100° C. measured according to JIS Z1709 of 45% or more in the MD direction and a haze value measured according to JIS K7136 of 20% or less. And the bio-based degree of the whole biomass shrink film is 45% or more.

[0040] Further, the biomass shrink film of the present embodiment comprises a first polyethylene having a density of 0.920 to 0.935 g / cm 3 and a second polyethylene having a density of 0.890 g / cm 3 or more and less than 0.920 g / cm 3 and silicon dioxide having an average particle diameter of 0.1 μm or less and glycerin fatty acid ester. And the first polyethylene and the second polyethylene are included in a mass ratio of 10:90 to 40:60, and further, 0.5 to 5 parts by mass of silicon dioxide and 0.5 to 3 parts by mass of glycerin fatty acid ester are included with respect to 100 parts by mass in total of the first polyethylene and the second polyethylene. In the biomass shrink film, the bio-based degree of the second polyethylene is 39.2% or less, and the bio-based degree of the whole biomass shrink film is 45% or more.

[0041] The biomass shrink film of this embodiment mixes plant-derived polyethylene so that the bio-based degree of the whole film is 45% or more. However, with the above-described configuration, a shrink film excellent in heat shrinkability even at low temperatures can be obtained. Furthermore, by adjusting the blending amount of silicon dioxide, a shrink film excellent in heat shrinkability at low temperatures can be obtained while maintaining high transparency. Also, by adjusting the blending amounts of silicon dioxide and glycerin fatty acid ester, a shrink film excellent in heat shrinkability at low temperatures can be obtained while maintaining high transparency and strength.

[0042] In the biomass shrink film of this embodiment, the first polyethylene may be low-density polyethylene, and the second polyethylene may be linear low-density polyethylene. By using such first polyethylene and second polyethylene, a shrink film excellent in low-temperature heat shrinkability, transparency, and strength can be obtained.

[0043] The thickness of the biomass shrink film of this embodiment may be 50 μm to 150 μm. Thereby, a shrink film particularly excellent in tensile strength and heat shrinkability can be obtained.

[0044] The multilayer shrink film of this embodiment includes a biomass shrink film. By laminating the above-described biomass shrink film and another shrink film, a multilayer shrink film having the characteristics of each layer can be obtained.

Examples

[0045] Hereinafter, this embodiment will be described in more detail with reference to examples and comparative examples, but this embodiment is not limited to these examples.

[0046] [Production of Shrink Film] Shrink films of Examples 1 to 12 and Comparative Examples 1 to 8 were produced with the raw materials and blending amounts shown in Tables 1 to 4. When producing the shrink film of each example, the following raw materials were used. · First polyethylene: Plant-derived polyethylene (low-density polyethylene), manufactured by Braskem, STN7006, density 0.924 g / cm 3 , bio-based content 95% · First polyethylene: Petroleum-derived polyethylene (high-pressure low-density polyethylene), manufactured by Sumitomo Chemical Co., Ltd., Sumikasen (registered trademark) F-208-3, density 0.924 g / cm 3 · Second polyethylene: Plant-derived polyethylene (linear low-density polyethylene), manufactured by Braskem, SLL118, density 0.916 g / cm 3 , bio-based content 87% · Second polyethylene: Petroleum-derived polyethylene (linear low-density polyethylene), manufactured by Sumitomo Chemical Co., Ltd., Sumikasen (registered trademark) EFV103, density 0.903 g / cm 3 · Silicon dioxide: Manufactured by Nippon Aerosil Co., Ltd., hydrophilic fumed silica, AEROSIL (registered trademark) 200 · Glycerin fatty acid ester: Manufactured by Riken Vitamin Co., Ltd., glycerin monostearate, Rikemal (registered trademark) S-100 · Lubricant: Zinc stearate · Antioxidant: Manufactured by BASF Japan Ltd., hindered phenol-based antioxidant, Irganox (registered trademark) 1010

[0047] Specifically, first, the raw materials were weighed according to the compounding amounts shown in Tables 1 to 4. Then, the first polyethylene and the second polyethylene were kneaded using an extruder, and further silicon dioxide, glycerin fatty acid ester, lubricant, and antioxidant were added and kneaded sufficiently. And the obtained kneaded product was formed into a film by the inflation molding method to obtain the shrink films of each example. The thickness of the shrink film of each example was set to 100 μm.

[0048]

Table 1

[0049]

Table 2

[0050]

Table 3

[0051]

Table 4

[0052] [Evaluation] The bio-based degree, heat shrinkability, transparency, and strength of the shrink films of each example obtained as described above were evaluated.

[0053] The bio-based degree of the entire shrink film was measured in accordance with ISO 16620-4.

[0054] The heat shrinkability was measured for the shrinkage rates in both the MD direction and the TD direction in accordance with Japanese Industrial Standard JIS Z1709 (Film for Shrink Packaging). The heating condition of the test piece was immersion in an oil bath at 100 °C for 20 seconds. A case where the heat shrinkage rate in the MD direction was 45% or more and the heat shrinkage rate in the TD direction was 20% or more was regarded as passing.

[0055] The transparency was measured for the haze value in accordance with JIS K7136 (Plastics - Method of Test for Haze of Transparent Materials). A case where the haze value was 20% or less was regarded as passing.

[0056] The strength was measured for the tensile strength in the MD direction in accordance with JIS Z1702 (Polyethylene Film for Packaging). A case where the tensile strength was 60 MPa or more was regarded as passing. The test methods and reference values for the bio-based degree, heat shrinkability, transparency, and strength of the entire shrink film are summarized in Table 5.

[0057] Also, from the addition amount and bio-based degree of the second polyethylene which is plant-derived polyethylene, the bio-based degree of the second polyethylene in the shrink film of each example was determined.

[0058]

Table 5

[0059] As shown in Tables 1 to 4, it can be seen that the shrink films of Examples 1 to 12 have a bio-based degree of 45% or more, and in addition to heat shrinkability and transparency, they also have excellent tensile strength.

[0060] On the other hand, it can be seen that the shrink film of Comparative Example 1 with a large blending amount of the first polyethylene, silicon dioxide, and glycerin fatty acid ester is inferior in tensile strength in addition to heat shrinkability and transparency. The shrink films of Comparative Examples 2 to 4 with a large blending amount of silicon dioxide and glycerin fatty acid ester resulted in inferior transparency and tensile strength. The shrink films of Comparative Examples 5 and 6 with a small blending amount of silicon dioxide and glycerin fatty acid ester resulted in inferior heat shrinkability. And the shrink films of Comparative Examples 7 and 8 are excellent in heat shrinkability, transparency, and tensile strength, but the bio-based degree is inferior.

[0061] As described above, although this embodiment has been described, this embodiment is not limited to these, and various modifications are possible within the scope of the gist of this embodiment.

Claims

1. The first polyethylene having a density of 0.920 to 0.935 g / cm ３ and, The density is 0.890 g / cm ３ or more and 0.920 g / cm ３ less than that of a second polyethylene, and Silicon dioxide, glyceryl fatty acid ester, A biomass shrink film containing, The first polyethylene and the second polyethylene are included in a mass ratio of 10:90 to 40:60, The bio-based degree of the second polyethylene is 39.2% or less, The heat shrinkage rate at 100 ° C measured according to JIS Z1709 is 45% or more in the MD direction, The haze value measured according to JIS K7136 is 20% or less, A biomass shrink film in which the bio-based degree of the entire biomass shrink film is 45% or more.

2. Based on 100 parts by mass in total of the first polyethylene and the second polyethylene, 0.5 to 5 parts by mass of the silicon dioxide is contained, and 0.5 to 3 parts by mass of the glyceryl fatty acid ester is contained. The biomass shrink film according to claim 1.

3. The biomass shrink film according to claim 1 or 2, wherein the average particle diameter of the silicon dioxide is 0.1 μm or less.

4. The biomass shrink film according to claim 1 or 2, wherein the first polyethylene is low density polyethylene and the second polyethylene is linear low density polyethylene.

5. The biomass shrink film according to claim 1 or 2, wherein the thickness of the biomass shrink film is 50 μm to 150 μm.

6. A first polyethylene having a density of 0.920 to 0.935 g / cm ３ and, with a density of 0.890 g / cm ３ or more and less than 0.920 g / cm ３ a second polyethylene, Silicon dioxide having an average particle diameter of 0.1 μm or less, glyceryl fatty acid ester, A biomass shrink film containing, The first polyethylene and the second polyethylene are included in a mass ratio of 10:90 to 40:60, Based on 100 parts by mass in total of the first polyethylene and the second polyethylene, 0.5 to 5 parts by mass of the silicon dioxide is contained, and 0.5 to 3 parts by mass of the glyceryl fatty acid ester is contained, The bio-based degree of the second polyethylene is 39.2% or less, A biomass shrink film in which the bio-based degree of the entire biomass shrink film is 45% or more.

7. A multilayer shrink film comprising the biomass shrink film according to claim 1 or 6.

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