JP2015189160A - Sealant film, film laminate using the same, and standing pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealant film, a film laminate and a standing pouch that satisfy the qualification standard of a Biomass Pla mark using a plant-derived polyethylene resin material, while having excellent rigidity, impact resistance and low-temperature heat sealability.SOLUTION: A sealant film includes: a laminate layer having (a) 30-90 mass% of plant-derived linear low-density polyethylene, (b) 10-30 mass% of plant-derived and/or petroleum-derived high density polyethylene and (c) 0-60 mass% of petroleum-derived linear low-density polyethylene; and a seal layer including petroleum-derived and/or plant-derived linear low-density polyethylene. The biomass degree of the sealant film is 25% or more.

Description

  The present invention relates to a sealant film. More specifically, by using a plant-derived polyethylene resin raw material, the load on the environment is reduced, and a sealant film having good rigidity, impact resistance, and heat sealability, and a film laminate using the same Regarding standing pouches.

  Plastic is used in many scenes of daily life, and has become an indispensable material for making products. Among various plastic materials, polyethylene film is a material excellent in heat sealability, impact resistance, flexibility and the like, and is widely used in various containers for packaging food, toiletry products, and the like.

  Conventionally, the sealant film used for the production of a packaging container is mainly composed of three layers, and each layer is usually made of (linear) low density, medium density, and high density polyethylene in order to exhibit various properties. It is formed from a single material selected (see Patent Documents 1 and 2).

  By the way, in recent years, the replacement of the conventional petroleum-derived plastic material with carbon neutral plant-derived plastic material has been examined due to the increasing awareness of the prevention of global warming and the reduction of the amount of oil used as a depleted resource. If the mass ratio of plant-derived plastic in the product meets the standard of 25% or more, the Biomass Plastic Mark is certified by the Japan Bioplastics Association.

  For plant-derived polyethylene resins, grades of linear low-density polyethylene (LLDPE) and high-density polyethylene (HDPE) have been manufactured and sold by Braskem since 2011, and studies using the plant-derived polyethylene have been made. (See Patent Documents 3 to 6).

JP 2008-238510 A JP 2005-162217 A JP 2012-167172 A JP 2013-91259 A JP 2013-136589 A JP 2013-151623 A

  However, existing sealant films using plant-derived polyethylene do not necessarily have good rigidity, impact resistance, and low-temperature heat sealability.

  Currently, plant-derived polyethylene is only manufactured and sold by Braskem, and the grades of LLDPE and HDPE that are manufactured and sold are not as finely divided as petroleum-derived polyethylene. For this reason, when mass-producing products using the LLDPE and HDPE, the petroleum-derived polyethylene is directly replaced with plant-derived polyethylene having the same physical properties such as density and melt flow rate in the existing sealant film. Cannot be achieved and it is not easy to achieve the desired film properties.

  Therefore, a new sealant film design different from the conventional three-layer structure in which each layer is formed from a single petroleum-derived polyethylene is also considered in consideration of using plant-derived polyethylene that is currently commercially available as a raw material. Desired.

  An object of the present invention is to provide a sealant film, a film laminate, and a standing pouch that satisfy the certification standard of a biomass mark using a plant-derived polyethylene resin raw material and that are excellent in rigidity, impact resistance, and low-temperature heat sealability. That is.

  The present invention includes (a) 30-90% by mass of plant-derived linear low-density polyethylene, (b) 10-30% by mass of plant-derived and / or petroleum-derived high-density polyethylene, and (c) petroleum-derived linear chain. The present invention relates to a sealant film comprising a laminate layer containing 0 to 60% by mass of low-density polyethylene and a seal layer containing linear low-density polyethylene derived from petroleum and / or plants, and having a biomass degree of 25% or more.

  The present invention also relates to a film laminate comprising the sealant film and a base film, wherein the base film is laminated on the laminate layer side of the sealant film.

  Furthermore, this invention includes the standing pouch formed using the said film laminated body and whose biomass degree is 25% or more.

  According to the present invention, it is possible to provide a sealant film, a film laminate, and a standing pouch that satisfy the certification standard of a biomass plastic mark and are excellent in rigidity, impact resistance, and low-temperature heat sealability.

It is sectional drawing which shows the sealant film of this invention. It is sectional drawing which shows the film laminated body of this invention. It is a front view which shows the standing pouch of this invention.

  Hereinafter, embodiments of the present invention will be described in detail. In the following description, the drawings are referred to as appropriate, but the embodiments described in the drawings are examples of the present invention, and the present invention is not limited to the embodiments described in these drawings.

<Sealant film>
The sealant film of the present invention comprises (a) 30 to 90% by weight of linear low-density polyethylene derived from plants, (b) 10 to 30% by weight of high-density polyethylene derived from plants and / or petroleum, and (c) derived from petroleum. The laminate layer containing 0 to 60% by mass of the linear low-density polyethylene and the seal layer containing the petroleum-derived and / or plant-derived linear low-density polyethylene, and the degree of biomass is 25% or more.

  FIG. 1 is a cross-sectional view showing a sealant film of the present invention. A sealant film 10 shown in the figure includes a laminate layer 12 and a seal layer 14.

(Laminate layer 12)
The laminate layer 12 is a layer that is bonded to the base film via an adhesive layer when forming a film laminate to be described later.

  Laminate layer 12 comprises (a) 30-90% by weight of linear low density polyethylene derived from plants, (b) 10-30% by weight of high density polyethylene derived from plants and / or petroleum, and (c) It contains 0-60% by mass of chain low density polyethylene.

  In order to improve both the rigidity and impact resistance properties, the laminate layer 12 is made of (a) a plant-derived linear low-density polyethylene, (a) a plant-derived linear low-density polyethylene, and (b) a plant. 30 to 90% by mass, preferably 40 to 80% by mass, based on the total mass of the origin and / or petroleum-derived high-density polyethylene and (c) petroleum-derived linear low-density polyethylene.

  In the present invention, the plant-derived linear low-density polyethylene is a copolymer of ethylene and α-olefin produced using a plant as a raw material, and may be synthesized by a known production method.

  As the α-olefin, a compound having 3 to 20 carbon atoms can be used. For example, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-nonene, Examples include decene, 1-dodecene, 4-methyl-1-pentene, 4-methyl-1-hexene, and a mixture thereof may be used. The α-olefin is preferably a compound having 4 or 6 carbon atoms or a mixture thereof, and is 1-butene or 1-hexene or a mixture thereof.

The plant-derived linear low-density polyethylene may be a commercially available product, and those manufactured and sold by Braskem can be used. Specifically, SLL118 (MFR; 1.0 g / 10 min, density; 0.916 g / cm ³ ), SLL118 / 21 (MFR; 1) using a compound (C4) having 4 carbon atoms as an α-olefin. 0.0 g / 10 min, density; 0.918 g / cm ³ ), SLL218 (MFR; 2.3 g / 10 min, density; 0.918 g / cm ³ ), SLL318 (MFR; 2.7 g / 10 min, density; 0.918 g / cm ³ ), a mixture of compounds having 4 and 6 carbon atoms (C4 / C6) as an α-olefin, SLH118 (MFR; 1.0 g / 10 min, density; 0.916 g / cm ³ ), SLH218 (MFR; 2.3g / 10 min, ^{density; 0.916g / cm 3), SLH0820} / 30AF (MFR; 0.8g / 10 min, density; 0.920g / cm ³⁾ suitably It is possible to use.

The plant-derived linear low-density polyethylene has a density of preferably 0.905 to 0.935 g / cm ³ , more preferably 0.915 to 0.930 g / cm ³ , and MFR is preferably 0.5 to 6.0 g / 10 min, more preferably 2.0 to 4.0 g / 10 min. In this specification, the density is a value measured in accordance with JIS K6760, and the melt flow rate (MFR) is a load of 21.18 N (2.16 kgf) at 190 ° C. in accordance with JIS K7210. It is a measured value of the weight of resin discharged in 10 minutes.

  In order to improve both the rigidity and impact resistance properties, the laminate layer 12 is made of (b) plant-derived and / or petroleum-derived high-density polyethylene, (a) plant-derived linear low-density polyethylene, (b It is contained in an amount of 10 to 30% by mass, preferably 15 to 25% by mass, based on the total mass of high-density polyethylene derived from plants and / or petroleum and (c) linear low-density polyethylene derived from petroleum.

  In the present invention, plant-derived and petroleum-derived high-density polyethylenes are respectively produced by using medium-pressure or low-pressure ethylene in the presence of a Ziegler catalyst or a Philips catalyst in the presence of ethylene produced using plant as a raw material and ethylene produced using petroleum as a raw material. It may be a polymer synthesized under conditions.

The plant-derived and petroleum-derived high-density polyethylene may be commercially available products. For example, as the plant-derived high-density polyethylene, one manufactured and sold by Braskem can be used. Specifically, SGF4950 (MFR; 0.34 g / 10 min, density; 0.956 g / cm ³ ) SGF4960 (MFR; 0.34 g / 10 min, density; 0.961 g / cm ³ ), SHA7260 (MFR; 20 g / 10 min, density; 0.955 g / cm ³ ), SHC7260 (MFR; 7.2 g / 10) Min, density; 0.959 g / cm ³ ), SHD7255LSL (MFR; 4.5 g / 10 min, density; 0.954 g / cm ³ ), SGE7252 (MFR; 2.2 g / 10 min, density; 0.953 g / ^{cm 3), SHE150 (MFR;} 1.0g / 10 min, ^{density; 0.948g / cm 3), SGM9450F} (MFR; 0.3 g / 10 min (measurement conditions: 190 ℃, 5.0kgf), density; 0.952g / cm ³⁾ can be suitably used.

The high density polyethylene used as the material of the laminate layer 12 preferably has a density of 0.945 to 0.965 g / cm ³ , more preferably 0.950 to 0.960 g / cm ³ , and MFR is preferably 0.3 to 25 g / 10 min, more preferably 4 to 10 g / 10 min.

  In order to improve both the rigidity and impact resistance properties and to reduce costs, the laminate layer 12 is made of (c) petroleum-derived linear low-density polyethylene and (a) plant-derived linear low-density polyethylene. Density polyethylene, (b) plant-derived and / or petroleum-derived high-density polyethylene and (c) petroleum-derived linear low-density polyethylene are included in an amount of 0 to 60% by mass, preferably 10 to 50% by mass. .

  In the present invention, petroleum-derived linear low-density polyethylene is a copolymer of ethylene and α-olefin produced using petroleum as a raw material, and may be synthesized by a known production method.

  As the α-olefin, a compound having 3 to 20 carbon atoms can be used. For example, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-nonene, Examples include decene, 1-dodecene, 4-methyl-1-pentene, 4-methyl-1-hexene, and a mixture thereof may be used. The α-olefin is preferably a compound having 4, 6 or 8 carbon atoms or a mixture thereof, and is 1-butene, 1-hexene, 1-octene or a mixture thereof.

The petroleum-derived linear low-density polyethylene may be a commercially available product, for example, Ube Maruzen Polyethylene 2040F (C6-LLDPE, MFR; 4.0, density; 0.918 g / cm ³ ) is used. it can.

The linear low density polyethylene derived from petroleum preferably has a density of 0.905 to 0.935 g / cm ³ , more preferably 0.915 to 0.930 g / cm ³ , and an MFR of preferably 0 0.5 to 6.0 g / 10 min, and more preferably 2.0 to 4.0 g / 10 min.

  The laminate layer 12 may further contain another polymer material as long as the effects of the present invention are not impaired. Further, for the purpose of preventing adhesion, slipping, oxidation and the like, additives such as an anti-blocking agent, slip agent and antioxidant may be contained within a range not impairing the effects of the present invention.

  The thickness of the laminate layer 12 is preferably 60 to 150 μm in consideration of processability and the like.

(Sealing layer 14)
The seal layer 14 is a layer that plays the role of packaging and sealing the contents when the sealant film 10 is used as a packaging material.

  The seal layer 14 is made of linear low-density polyethylene in order to achieve good low-temperature heat-sealability, and the linear low-density polyethylene can be petroleum-derived or plant-derived, or both. .

The linear low density polyethylene used as the material of the seal layer 14 has a density of preferably 0.905 to 0.935 g / cm ³ , more preferably 0.910 to 0.920 g / cm ³ , and an MFR is Preferably, it is 0.5 to 6.0 g / 10 min, more preferably 2.0 to 4.0 g / 10 min, and the melting point is preferably 90 to 120 ° C., more preferably 95 to 115 ° C. is there. The melting point is a value measured according to JIS K 0064.

  As the raw materials and suitable commercial products of the petroleum-derived and plant-derived linear low-density polyethylene, the same materials as those used in the laminate layer 12 can be used.

  The sealing layer 14 may further contain another polymer material as long as the effects of the present invention are not impaired. Further, for the purpose of preventing adhesion, slipping, oxidation and the like, additives such as an anti-blocking agent, slip agent and antioxidant may be contained within a range not impairing the effects of the present invention.

  The thickness of the sealing layer 14 is preferably 20 to 50 μm in consideration of sufficient sealing properties and cost reduction.

(Biomass degree)
The biomass degree of the sealant film 10 is 25% or more that satisfies the certification standard of the biomass plastic mark. When the sealant film 10 is used as a packaging material, the biomass degree of the sealant film 10 can be appropriately set so that the biomass degree of the final product (for example, a standing pouch) is 25% or more.

  In the present specification, the biomass degree is a percentage of the dry mass of the plant-derived raw material used with respect to the dry mass of the product, and based on the ASTM D6866 method, the concentration of radioactive carbon (C14) by an accelerator mass spectrometer (AMS). Is a value measured based on the principle of radiocarbon dating. Most of the carbon contained in the Earth's atmosphere has a mass number of 12 (12C), but one trillionth has a mass number of 14 (14C). This is an element produced by irradiating cosmic rays to nitrogen atoms in the high sky, and slowly returns to nitrogen atoms due to radiation decay with a half-life of 5730 years. By measuring the 14C / 12C ratio in the sample (product), it is possible to know the time that has elapsed since the sample was isolated from the earth's atmosphere and became a closed system, derived from the plant used in the product. The proportion of raw materials is revealed. This is the principle of radiocarbon dating. As a method for producing the sealant film 10 of the present invention, a known method for producing a multilayer film can be used. For example, a coextrusion T-die method, a coextrusion inflation method, or the like can be employed.

  The sealant film 10 of the present invention described above has good rigidity, impact resistance, and low-temperature heat sealability by including a laminate layer 12 containing a specific amount of LLDPE and HDPE and a seal layer 14. . For this reason, when the sealant film 10 is used as a material for the standing pouch, the self-supporting property of the pouch, the impact resistance when dropped, and the productivity are improved. Moreover, since the resin material used for the sealant film 10 is excellent in extrusion film forming processability, the sealant film 10 is formed by various manufacturing methods including, for example, a co-extrusion T-die method in which use is limited by the MFR of the resin. Can be manufactured.

<Film laminate>
FIG. 2 is a cross-sectional view showing the film laminate of the present invention. A film laminate 20 shown in the figure includes a sealant film 10 including a laminate layer 12 and a seal layer 14, and a base film 16 laminated on the laminate layer 12 side of the sealant film 10 via an adhesive layer 18. .

(Sealant film 10)
As the sealant film 10, the above-mentioned sealant film can be applied, and the configuration and manufacturing method thereof are omitted because they are described in detail in the section <Sealant film>.

(Base film 16)
The base film 16 is a layer for imparting mechanical strength and the like to the film laminate.

  The base film 16 can be any film depending on the application. When the film laminate is used as a material for a standing pouch, it is preferably a stretched film. Examples of the material include polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, nylon-6, nylon-66, and the like. These polyamide resins, polycarbonate resins, polyacrylonitrile resins, polyimide resins, polyvinyl alcohol resins, polyvinylidene chloride resins, ethylene-vinyl alcohol copolymer resins and the like can be selected and used. The stretching of the film may be uniaxial or biaxial.

  In general, the thickness of the base film 16 is preferably selected as appropriate within a range of 10 to 150 μm in consideration of mechanical strength and workability.

  In order to provide the base film 16 with a barrier property against gases such as water vapor and oxygen, a vapor deposition layer (not shown) formed of aluminum, silicon oxide, aluminum oxide, magnesium oxide or the like is provided on the surface of the base film 16. be able to. The vapor deposition layer may be provided on either the adhesive layer 18 side or the opposite side.

  The base film 16 can have a plurality of layers. For example, an adhesive layer may be provided between the base film 16 and the base film 16 to form a plurality of layers.

  As a manufacturing method of the base film 16, well-known manufacturing methods, such as a casting method, can be used.

(Adhesive layer 18)
The film laminate 20 may include an adhesive layer 18 for adhering the laminate layer 12 of the sealant film 10 and the base film 16.

As the material of the adhesive layer 18, a conventional material can be used. For example, a one-component or two-component curable urethane adhesive can be used. From the viewpoint of adhesive strength, it is desirable that the coating amount of the adhesive during drying is about ² to 5 g / m ² .

  The biomass degree of the film laminate 20 of the present invention is preferably 25% or more so that the biomass degree of the final product (for example, a standing pouch) is 25% or more that satisfies the certification standard of the biomass plaque.

  As a method for producing the film laminate 20 of the present invention, a known production method can be used. For example, the sealant film 10, the base film 16, and the adhesive layer 18 can be laminated by a dry lamination method, a knee lamination method, or the like.

<Standing pouch>
A packaging container can be manufactured using the sealant film and / or film laminate of the present invention. Hereinafter, a standing pouch will be described as an example of the packaging container.

  FIG. 3 is a front view showing a standing pouch according to the present invention. The standing pouch 30 shown in the figure is arranged so that the seal layers 14 of the front surface member 31 and the back surface member 32 using the film laminate 20 face each other, and the bottom surface using the film laminate 20 at the lower end. The member 33 is inserted by being folded at a folding line 34 so that the seal layer 14 is on the inside of the pouch, forming a gusset portion, and an elliptical notch in the vicinity of the lower ends on both sides of the folded bottom member 33. Part 35 is provided, and the gusset part is heat-sealed by a bottom-shaped bottom seal part 36 including a peripheral part to form a bottom part, and the body part of the pouch 30 is attached to both ends of the superposed surface member 31 and back member 32. It is formed by providing side seal portions 37a and 37b by heat sealing, and after the contents such as liquid and powder are filled from above, heat sealing is performed by the upper seal portion 38. And in, obtaining a standing pouch 30 contents is filled.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.

<Manufacture of sealant film, film laminate and standing pouch>
(Resin used to manufacture sealant film)
As plant-derived C4 / C6-LLDPE, SLH218 (MFR; 2.3 g / 10 min, density; 0.916 g / cm ³ ) manufactured by Braskem was used.

As plant-derived C4-LLDPE, Braskem SLL318 (MFR: 2.7 g / 10 min, density: 0.918 g / cm ³ ) was used.

As plant-derived HDPE, SHC7260 (MFR; 7.2 g / 10 min, density; 0.959 g / cm ³ ) manufactured by Braskem was used.

As petroleum-derived LLDPE, 2040F (C6-LLDPE, MFR; 4.0, density; 0.918 g / cm ³ ; melting point 112 ° C.) manufactured by Ube Maruzen Polyethylene Co., Ltd. was used.

(Example 1)
The sealant film has a two-layer structure of a laminate layer and a seal layer. As a material for the laminate layer, a blend of 20 parts by mass of plant-derived HDPE with 80 parts by mass of plant-derived C4 / C6-LLDPE was used, and 100 parts by mass of petroleum-derived LLDPE was used as the material of the seal layer. As the extruder, an extruder manufactured by Sumitomo Heavy Industries Modern Ltd. was used. For laminate layer, screw diameter: 115 mmφ, compression ratio L / D: Set to 75 μm using 32 screws, for seal layer, screw diameter: 90 mmφ, compression ratio L / D: set to 25 μm using screw, sealant Coextrusion film forming processing by a T-die method was performed under a temperature condition of 240 ° C. so that the total thickness of the film was 100 μm. At this time, the temperature of the cooling roll was 50 ° C.

  The laminated layer surface of the formed polyethylene film was subjected to corona treatment, and the treated surface and a stretched nylon film of 15 μm were bonded together by dry lamination via a urethane-based two-component adhesive.

  Further, the stretched nylon film surface of the obtained laminated film and the polyethylene terephthalate film 12 μm were bonded together by dry lamination through a urethane two-liquid adhesive, to obtain a film laminate for a trunk member of a standing pouch.

  Next, a polyethylene film composed of a laminate layer and a seal layer is prepared in exactly the same manner as the body member, and the laminate layer surface is subjected to corona treatment, and the treated surface and the stretched nylon film 15 μm are mixed with a urethane-based two-part adhesive adhesive. Was laminated by dry lamination to obtain a film laminate for a bottom member of a standing pouch.

  Using the obtained film laminate for body members and the film laminate for bottom members, a standing pouch having a shape of 160 mm in width, 230 mm in height and 30 mm in folded height at the bottom was formed. The container has a liquid content of 600 ml.

(Example 2)
The sealant film had a two-layer structure of a laminate layer and a seal layer, and a material for the laminate layer was a blend of 80 parts by mass of plant-derived C4-LLDPE and 20 parts by mass of plant-derived HDPE. Other than that was carried out in the same manner as in Example 1.

(Example 3)
The sealant film has a two-layer structure of a laminate layer and a seal layer. As a material for the laminate layer, 40 parts by mass of plant-derived C4 / C6-LLDPE, 20 parts by mass of plant-derived HDPE, and 40 parts by mass of petroleum-derived LLDPE are blended. What was done was used. Other than that was carried out in the same manner as in Example 1.
Example 4
The sealant film has a two-layer structure of a laminate layer and a seal layer. As a material of the laminate layer, 40 parts by mass of plant-derived C4-LLDPE, 20 parts by mass of plant-derived HDPE, and 40 parts by mass of petroleum-derived LLDPE are blended. Was used. Other than that was carried out in the same manner as in Example 1.

(Comparative Example 1)
The sealant film has a two-layer structure of a laminate layer and a seal layer, and 100 parts by mass of plant-derived C4 / C6-LLDPE was used as a material for the laminate layer. Other than that was carried out in the same manner as in Example 1.

(Comparative Example 2)
The sealant film has a two-layer structure of a laminate layer and a seal layer, and a laminate layer material obtained by blending 60 parts by mass of plant-derived C4 / C6-LLDPE and 40 parts by mass of plant-derived HDPE was used. Other than that was carried out in the same manner as in Example 1.

(Comparative Example 3)
The sealant film used was a single layer configuration of a laminate layer and a seal layer, with 80 parts by mass of plant-derived C4 / C6-LLDPE and 20 parts by mass of plant-derived HDPE. As the extruder, an extruder manufactured by Sumitomo Heavy Industries Modern Ltd. was used. Screw diameter: 115 mmφ, compression ratio L / D: 32 screw and screw diameter: 90 mmφ, compression ratio L / D: 32 screw, so that the total thickness of the sealant film is 100 μm, and the temperature condition is 240 ° C. Then, extrusion film formation by the T-die method was performed. Other than that was carried out in the same manner as in Example 1.

<Evaluation items>
The following evaluation was performed about Examples 1-4 and Comparative Examples 1-3.

(Extrusion film forming processability)
Extrusion film forming processability was evaluated for the sealant film forming materials used in Examples 1 to 4 and Comparative Examples 1 to 3. The resin pressure inside the extruder when extrusion film forming was performed under the conditions of a processing speed of 70 m / min and an extrusion film forming effective width of 900 mm was measured with a resin pressure gauge (manufactured by Dinisco) attached to the die head of the extruder. Evaluation was performed according to the following criteria.
○: Resin pressure is less than 40 MPa ×: Resin pressure is 40 MPa or more

(Biomass degree)
Based on the principle of radioactive carbon (C14) dating by determining the concentration of radioactive carbon with an accelerator mass spectrometer (manufactured by National Electrostatics Corporation) based on ASTM D6866 method, Examples 1-4 and Comparative Example 1 The degree of biomass of the sealant film produced in ~ 3 was measured, and the degree of biomass was evaluated according to the following criteria.
○: Biomass degree is 25% or more ×: Biomass degree is less than 25%

(Heat sealability)
About the film | membrane laminated body for trunk | drum members manufactured in Examples 1-4 and Comparative Examples 1-3, according to JISZ0238, heat seal was performed on the conditions of 0.2 MPa and 1 second in the temperature range of 90-170 degreeC. A strip-shaped sample having a width of 15 mm was prepared, and heat seal strength was measured with a Tensilon universal testing machine (Orientec Co., Ltd.) at a test speed of 300 mm / min. About each sample, the temperature (heat seal start temperature) which heat seal intensity | strength expresses was measured, and the heat seal property was evaluated on the following references | standards.
○: Heat seal start temperature is 140 ° C. or lower X: Heat seal start temperature exceeds 140 ° C.

(rigidity)
About the film laminated body for trunk | drum members manufactured in Examples 1-4 and Comparative Examples 1-3, rigidity was measured using the loop stiffness tester (made by Toyo Seiki Seisakusho). With the sample dimensions of a loop length of 110 mm and a sample width of 12 mm, the direction of the sample was measured under the condition of a crushing distance of 12 mm with the processing flow direction (MD direction), and the rigidity was evaluated according to the following criteria.
○: 40 mN or more ×: less than 40 mN

(Impact resistance)
About the standing pouch manufactured in Examples 1-4 and Comparative Examples 1-3, 600 ml of water (5 degreeC) was filled and enclosed as the content, and the drop test from 100 cm in height was done. The drop test was repeated until the packaging container was broken, and the number of drops until the broken bag was seen was confirmed. The number of drops was up to 20 times, and “> 20” was indicated when no bag breakage was seen even at the 20th time. When the standing pouch was dropped, it was dropped with the bottom of the pouch facing the ground. The impact resistance was evaluated according to the following criteria.
○: The number of drops to the broken bag is 20 times or more ×: The number of drops to the broken bag is less than 20 Table 1 shows the evaluation results of Examples 1 to 4 and Comparative Examples 1 to 3.

  According to the result of Table 1, this invention (Examples 1-4) satisfy | filled the target biomass degree 25% or more, and was excellent in rigidity, impact resistance, and low-temperature heat-sealing property. Examples 3 and 4 are obtained by replacing part of the plant-derived LLDPE of Examples 1 and 2 with petroleum-derived LLDPE. Although the degree of biomass is lower than that of Examples 1 and 2, the resin cost is low. By using a resin derived from petroleum, it is possible to reduce costs while satisfying a biomass degree of 25% or more.

  In addition, since the resin material used in the present invention is excellent in extrusion film forming processability, various conventional multilayer film manufacturing methods including the coextrusion T-die method can be applied.

  On the other hand, in Comparative Example 1 in which plant-derived LLDPE was used alone as the material for the laminate layer, the results were inferior to the present invention (Examples 1 to 4).

  Comparative Example 2 has a higher ratio of plant-derived HDPE than the present invention (Examples 1 to 4) as a material for the laminate layer, but is inferior in impact resistance and also has an extrusion film forming processability of the raw material resin. It got worse.

  Although the comparative example 3 made the sealant film into the single layer structure, it became a result inferior to heat sealability than this invention (Examples 1-4).

  Based on the above results, the sealant film of the present invention, as well as the film laminate and the standing pouch using the same, have good rigidity, impact resistance, and low-temperature heat sealability while having a biomass degree of 25% or more. I understand that Moreover, since the resin material used for this invention is excellent in extrusion film forming processability, it is possible to manufacture this invention with the manufacturing method of various multilayer films.

  The sealant film and film laminate of the present invention can be used in refill packaging containers (standing pouches) such as toiletry products, liquid detergents, softeners and hand soaps.

DESCRIPTION OF SYMBOLS 10 Sealant film 12 Laminate layer 14 Seal layer 20 Laminate film 18 Adhesive layer 16 Base film 30 Standing pouch 31 Front surface member 32 Back surface member 33 Bottom surface member 34 Folding line 35 Notch portion 36 Bottom surface seal portions 37a, 37b Side surface seal portion 38 Upper seal

Claims (7)

(A) Plant-derived linear low-density polyethylene 30-90% by mass, (b) Plant-derived and / or petroleum-derived high-density polyethylene 10-30% by mass, and (c) Petroleum-derived linear low-density polyethylene. A laminate layer containing 0 to 60% by mass;
A seal layer comprising a linear low density polyethylene derived from petroleum and / or from plants;
Including
A sealant film having a biomass degree of 25% or more. The plant-derived linear low-density polyethylene has a density of 0.905 to 0.935 g / cm ³ and is a copolymer of ethylene and an α-olefin, and the α-olefin has a carbon number. 4. The compound according to claim 1, wherein the plant-derived and / or petroleum-derived high-density polyethylene has a density of 0.945 to 0.965 g / cm ^3. The sealant film as described. The petroleum-derived linear low-density polyethylene has a density of 0.905 to 0.935 g / cm ³ and is a copolymer of ethylene and an α-olefin, and the α-olefin has a carbon number. The sealant film according to claim 1, wherein the sealant film is a compound of 4, 6, or 8 or a mixture thereof.   The sealant film according to any one of claims 1 to 3, wherein the laminate layer has a thickness of 60 to 150 µm, and the seal layer has a thickness of 20 to 50 µm.   The sealant film according to any one of claims 1 to 4, which is formed by a T-die coextrusion method.   A film laminate comprising the sealant film according to claim 1 and a base film, wherein the base film is laminated on the laminate layer side of the sealant film.   A standing pouch characterized by having a biomass degree of 25% or more formed using the film laminate according to claim 6.

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