Laminated sealing film

Abstract

This invention provides a sealant film containing propylene resin and polyethylene resin, which has excellent low-temperature bag-making properties and heat-sealing strength. The laminated sealant film simultaneously satisfies the following 1) to 8): 1) It includes at least a laminate and a sealant layer; 2) The laminate is composed of a resin composition mainly composed of polypropylene resin; 3) The sealant layer is composed of a resin composition mainly composed of a mixture of polypropylene resin and polyethylene resin; 4) Relative to 100% by weight of the mixture of polypropylene resin and polyethylene resin constituting the sealant layer, it includes 1% to 90% by weight of polypropylene resin and 10% to 99% by weight of polyethylene resin; 5) The polyethylene resin constituting the sealant layer includes 90% or more of linear polyethylene resin; 6) The difference in melting point between the polypropylene resin and the linear polyethylene resin in the sealant layer is 15°C or more; 7) The ratio of the melt flow rate of the polypropylene resin in the sealant layer to the melt flow rate of the linear polyethylene resin is 0.5 or more to 2.0 or less; 8) The melt flow rate of the polypropylene resin and the linear polyethylene resin in the sealant layer is 9 g / 10 min or less.

Description

Technical Field

[0001] This invention relates to a laminated sealant film, which has excellent bag-making properties and low-temperature bag-making properties, as well as excellent sealing strength. Prior Technology

[0002] Packaging materials are constantly being developed to correspond to the contents of various commodities such as food, beverages, pharmaceuticals, and chemicals. Packaging materials are used in various forms, such as pillow packaging, side-sealed packaging, or three-side sealed packaging, and the sealing films used in packaging materials also have the required functions depending on their application.

[0003] The lower the temperature at which the sealant film can be heat-sealed, the better. This is especially suitable for packaging contents while simultaneously producing automatically pillow-shaped, edge-sealed, or three-side-sealed bags. This reduces electricity costs, improves workability, and lowers the risk of burns. Furthermore, it increases packaging and bag-making speed and reduces packaging material waste. Finally, the finished bags are also more aesthetically pleasing. However, sealant films are also required to perform various functions such as smooth packaging and bag making processes, and the resulting packaging bags must have good sealing performance and sealing strength.

[0004] For example, when the contents, which are heavy objects, are vertically pillow-shaped packaged by automated packaging, it is required that the sealing strength is still sufficient immediately after heat sealing, even when the resin of the sealant film is in a molten state, and that the seal will not peel off even when subjected to the impact caused by the pressure generated when the contents, which are heavy objects, are filled into the bag.

[0005] Furthermore, when the contents are packaged horizontally in a pillow-like manner using automated packaging, it is required that the sealing strength is sufficient even when the resin of the sealant film is in a molten state, and that the seal is not peeled off by the high-pressure (nitrogen flushing) gas used to fill the bag. Previous sealant films did not simultaneously meet the requirements of bag-making performance, low-temperature bag-making performance, and heat-sealing strength (for example, see Patent Documents 1 to 5). [Previous Technical Documents] [Patent Literature]

[0006] [Patent Document 1] Japanese Patent No. 4731699. [Patent Document 2] Japanese Patent Application Publication No. 2000-272064. [Patent Document 3] Japanese Patent Application Publication No. 2000-272065. [Patent Document 4] Japanese Patent Application Publication No. 2020-241716. [Patent Document 5] Japanese Patent Application Publication No. 2020-192695. Summary of the Invention

[0007] [The problem that the invention aims to solve]

[0008] The purpose of this invention is to provide a sealant film containing acrylic resin and polyethylene resin, which has excellent low-temperature bag-making properties and heat-sealing strength. [Methods used to solve problems]

[0009] As a result of diligent research to achieve the aforementioned objectives, the present invention is able to obtain a laminated sealant film with excellent low-temperature bag-making properties and sealing strength by controlling the raw material composition of each layer of the laminated sealant film. That is, the laminated sealant film of the present invention is composed of the following components.

[0010] [1] A laminated sealant film simultaneously satisfies the following 1) to 8): 1) comprising at least a laminated layer and a sealing layer; 2) the laminated layer is composed of a resin composition mainly composed of a polypropylene resin; 3) the sealing layer is composed of a resin composition mainly composed of a mixture of a polypropylene resin and a polyethylene resin; 4) relative to 100% by weight of the mixture of the polypropylene resin and the polyethylene resin constituting the sealing layer, it comprises 1% to 90% by weight of polypropylene resin and 10% to 99% by weight of polyethylene resin; 5) the polyethylene resin constituting the sealing layer comprises 90% or more of linear polyethylene resin; 6) the difference in melting point between the polypropylene resin and the linear polyethylene resin in the sealing layer is 15°C or more; 7) the ratio of the melt flow rate of the polypropylene resin in the sealing layer to the melt flow rate of the linear polyethylene resin is 0.5 to 2.0 or less; 8) the melt flow rate of the polypropylene resin and the linear polyethylene resin in the sealing layer is 9 g / 10 min or less. [2] As described above [1], the laminated sealant film, wherein the polypropylene resin of the aforementioned sealant layer is a random copolymer of propylene. [3] As described in [1] or [2], the laminated sealant film has a tensile modulus of less than 600 MPa in the longitudinal direction. [4] The laminated sealant film described in any of [1] to [3] has a main peak melting point of 120°C or higher. [5] The laminated sealant film described in any of [1] to [4] has a static friction coefficient of less than 0.5 between the sealing surfaces. [6] The laminated sealant film described in any of [1] to [5] has a coefficient of dynamic friction of less than 0.5 between the sealing surfaces. [7] As described in any of [1] to [6], the laminated sealant film contains organic particles as an anti-blocking agent. [8] The laminated sealant film described in any of [1] to [7] contains two or more fatty acid amides as organic lubricants. [Invention Benefits]

[0011] The laminated sealing film of this invention exhibits excellent low-temperature bag-making properties, making it suitable for packaging materials of various commodities such as food, beverages, pharmaceuticals, and chemicals. It is particularly suitable for automatic bag-making processes, such as pillow-type bags, side-sealed bags, or three-side-sealed bags, while simultaneously packaging the contents. Implementation

[0012] The present invention will now be described. The laminated sealant film of the present invention comprises at least a laminate and a sealing layer. The laminate and the sealing layer will now be described in detail.

[0013] [Sealing layer] The sealing layer in this invention is composed of a resin composition with a mixture of polypropylene resin and polyethylene resin as the main components. Furthermore, the term "main component" refers to the mixture of polypropylene resin and polyethylene resin accounting for 90% or more by mass, more preferably 95% or more by weight, even more preferably 97% or more by weight, and even more preferably 99% or more by weight in the resin composition.

[0014] [Polypropylene Resin] The polypropylene resin in the sealing layer is a resin with propylene as the main component. Examples include: propylene homopolymers, random copolymers and block copolymers of propylene with α-olefins such as ethylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, and 1-octene. Furthermore, the term "main component" refers to propylene accounting for 90% by weight or more, more preferably 95% by weight or more, further preferably 97% by weight or more, and even more preferably 99% by weight or more in the polypropylene resin.

[0015] The melt flow rate of the polypropylene resin constituting the sealing layer is preferably 0.1 g / 10 min or more to 9 g / 10 min or less, more preferably 0.5 g / 10 min or more to 8 g / 10 min or less, and even more preferably 1 g / 10 min or more to 7 g / 10 min or less. The melting point of the polypropylene resin constituting the sealing layer is preferably above 120°C, more preferably above 125°C to below 150°C, and even more preferably above 130°C to below 140°C.

[0016] The mixture of polypropylene resin and polyethylene resin constituting the sealing layer preferably contains 1% to 90% polypropylene resin, more preferably 5% to 90% polypropylene resin, relative to 100% by weight. If the polypropylene resin content is 1% or more, the sliding properties are excellent, and the ultimate heat seal strength is less prone to deviation.

[0017] Polyethylene-based resins The polyethylene resin in the sealing layer is mainly composed of linear low-density polyethylene. In addition to linear low-density polyethylene, at least one ethylene homopolymer selected from the group consisting of high-pressure low-density polyethylene, medium-density polyethylene and high-density polyethylene may be used. Furthermore, random or block copolymers, or mixtures of these copolymers, can be used, which are based on ethylene and copolymerized with monomers such as propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, 1-octene, vinyl acetate, (meth)acrylic acid, and (meth)acrylate. These copolymers can also be crystalline, hypocrystalline, or amorphous.

[0018] The melt flow rate of the polyethylene resin constituting the sealing layer is from 0.1 g / 10 min to 9 g / 10 min, more preferably from 0.5 g / 10 min to 8 g / 10 min, and even more preferably from 1 g / 10 min to 7 g / 10 min. The melting point of the polyethylene resin constituting the sealing layer is 100°C to 140°C, preferably 105°C to 135°C, and even more preferably 110°C to 130°C.

[0019] The polyethylene resin constituting the sealing layer is preferably composed of more than 90% by weight of linear polyethylene resin, more preferably more than 95% by weight, more preferably more than 97% by weight, and even more preferably more than 99% by weight.

[0020] The mixture of polypropylene resin and polyethylene resin constituting the sealing layer comprises, more preferably, 1% to 90% by weight of polypropylene resin and 10% to 99% by weight of polyethylene resin, and more preferably 20% to 90% by weight, relative to 100% by weight of the mixture. If the polypropylene resin content is less than 1% by weight, delamination is likely to occur between the polypropylene resin and the interlayer, and the sealing strength or sealing strength may deviate. The difference in melting points between the polypropylene resin and the polyethylene resin constituting the sealing layer is preferably 15°C or higher, more preferably 16°C or higher, even more preferably 17°C or higher, and even more preferably 18°C ​​or higher, and particularly preferably 19°C or higher. If the difference in melting points between the polypropylene resin and the polyethylene resin is 15°C or higher, the low-temperature bag-making performance is improved, and the miscibility of the polypropylene resin and the polyethylene resin is better, resulting in a smaller deviation in sealing strength or sealing power. Furthermore, the arithmetic mean melting point of the polypropylene resin and polyethylene resin constituting the sealing layer is preferably 100°C or higher, more preferably 112°C or higher, even more preferably 115°C or higher, even more preferably 116°C or higher, and particularly preferably 121°C or higher. If the arithmetic mean melting point of the polypropylene resin and polyethylene resin is 100°C or higher, the boiling adaptability as a packaging material is further improved; if it is 105°C or higher, the semi-retort adaptability is further improved; if it is 116°C or higher, the retort adaptability is further improved; and if it is 121°C or higher, the high-temperature retort adaptability is further improved.

[0021] [Anti-adhesion agent] In the resin composition of the sealing layer, anti-blocking agents can include: inorganic particles such as synthetic silica, diatomaceous earth, talc, or mica; and organic particles such as silicone particles, acrylic particles, nylon particles, or polyethylene particles. The average particle size of the particles used in this invention is preferably 2 μm or more, more preferably 3 μm or more, and even more preferably 5 μm or more. Furthermore, the average particle size is preferably 20 μm or less, more preferably 15 μm or less, and even more preferably 10 μm or less.

[0022] The content of particles in the resin composition of the sealing layer is preferably 0.1% by weight or more, more preferably 0.3% by weight or more, and even more preferably 0.4% by weight or more, relative to the sealing layer of the membrane. It is also preferably 2% by weight or less, more preferably 1.5% by weight or less, and even more preferably 1.0% by weight or less. If the amount of particles added is less than 0.1% by weight, it is difficult to achieve a surface roughness Ra of 0.1 μm or more on at least one side of the surface layer, making it difficult to obtain anti-adhesion or anti-slip properties. Furthermore, if the amount of particles added is more than 2% by weight, the surface protrusions increase, resulting in poor appearance or poor wear resistance.

[0023] [Organic lubricants] The resin composition in the sealing layer preferably contains 0.01% to 2.0% by weight of fatty acid amide as an organic lubricant, more preferably 0.05% to 1.5% by weight, and even more preferably 0.1% to 1.0% by weight. If the fatty acid amide content is less than 0.01%, the adhesion between membranes is strong, failing to meet the membrane's operability requirements. If the fatty acid amide content is 2.0% or more, the sealing strength decreases. Examples of fatty acid amides include: erucic acid amide, ethyl dioleoyl amide, docosanoic acid amide, etc., and these examples of fatty acid amides can also be used together.

[0024] The closer the melt flow rates of the resin components or raw material resins constituting the sealing layer, the better the appearance. The ratio of the melt flow rates of the raw material resins mixed in the sealing layer is preferably 0.5 to 2.0, more preferably 0.8 to 1.8, and even more preferably 1.0 to 1.6. If the melt flow rate ratio is within this range, it is less likely to cause appearance defects such as layer misalignment, waviness, or unevenness.

[0025] [Laminated layer] The laminate in this invention is composed of a resin composition with polypropylene resin as the main component. Furthermore, the term "main component" refers to polypropylene resin accounting for 90% by mass or more, more preferably 95% by weight or more, even more preferably 97% by weight or more, and even more preferably 99% by weight or more in the resin composition.

[0026] [Polypropylene Resin] The polypropylene resin in the laminate is a resin with propylene as the main component. Examples include: propylene homopolymers, random copolymers and block copolymers of propylene with α-olefins such as ethylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, and 1-octene. Among these examples, random copolymers and / or block copolymers of propylene with α-olefins such as ethylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, and 1-octene are preferred. Furthermore, the term "main component" refers to propylene comprising 90% by mass or more, more preferably 95% by weight or more, further preferably 97% by weight or more, and even more preferably 99% by weight or more in the polypropylene resin.

[0027] The melt flow rate (JIS K7112) of the polypropylene resin constituting the laminate is preferably 0.1 g / 10 min or more to 9 g / 10 min or less, more preferably 0.5 g / 10 min or more to 8 g / 10 min or less, and even more preferably 1 g / 10 min or more to 7 g / 10 min or less. The melting point (JIS K7121) of the polypropylene resin constituting the laminate is preferably above 120°C to below 160°C, more preferably above 125°C to below 155°C, and even more preferably above 130°C to below 150°C. The polypropylene resin constituting the laminate is a resin with propylene as the main component. Examples include: propylene homopolymers, random copolymers and block copolymers of propylene with α-olefins such as ethylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, and 1-octene. Among these, random copolymers of propylene with ethylene and / or 1-butene are preferred.

[0028] The resin composition of the laminate, in addition to polypropylene resins, may be, for example, at least one ethylene homopolymer selected from the group consisting of high-density polyethylene, linear low-density polyethylene, medium-density polyethylene and high-density polyethylene. Furthermore, random or block copolymers, or mixtures of these copolymers, can be used, which are based on ethylene and copolymerized with monomers such as propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, 1-octene, vinyl acetate, (meth)acrylic acid, and (meth)acrylate. These copolymers can also be crystalline, hypocrystalline, or amorphous.

[0029] The melt flow rate (JIS K7112) of the polyethylene resin constituting the laminate is preferably 0.1 g / 10 min or more to 9 g / 10 min or less, more preferably 0.5 g / 10 min or more to 8 g / 10 min or less, and even more preferably 1 g / 10 min or more to 7 g / 10 min or less. The melting point (JIS K7121) of the polyethylene resin constituting the laminate is preferably above 100°C to below 140°C, more preferably above 105°C to below 135°C, and even more preferably above 110°C to below 130°C. Polyethylene resins exhibit more than two melting endothermic peaks, with the peak having the largest melting endothermic heat as the dominant peak.

[0030] [Anti-adhesion agent] In the resin composition of the laminate, examples of anti-blocking agents include: inorganic particles such as synthetic silica, diatomaceous earth, talc, or mica; and organic particles such as silicone particles, acrylic particles, nylon particles, or polyethylene particles. The average particle size of the particles used in this invention is preferably 2 μm or more, more preferably 3 μm or more, and even more preferably 5 μm or more. Furthermore, the average particle size is preferably 20 μm or less, more preferably 15 μm or less, and even more preferably 10 μm or less.

[0031] The content of particles in the resin composition of the laminated layer, relative to the sealing layer of the film, is preferably 0.1% by weight or more, more preferably 0.3% by weight or more, and even more preferably 0.4% by weight or more. It is also preferably 2% by weight or less, more preferably 1.5% by weight or less, and even more preferably 1.0% by weight or less. If the amount of particles added is less than 0.1% by weight, it is difficult to achieve a surface roughness Ra of 0.1 μm or more on at least one side of the surface layer, making it difficult to obtain anti-adhesion or anti-slip properties. Furthermore, if the amount of particles added is more than 2% by weight, the surface protrusions increase, resulting in poor appearance or poor wear resistance.

[0032] [Organic lubricants] In the resin composition of the laminate, it is preferable to include 0.01% to 2.0% by weight of fatty acid amide as an organic lubricant, more preferably 0.05% to 1.5% by weight, and even more preferably 0.1% to 1.0% by weight. If the fatty acid amide content is less than 0.01%, the adhesion between membranes is strong, which does not meet the membrane's operability requirements. If the fatty acid amide content is 2.0% or more, the sealing strength is reduced. Examples of fatty acid amides include: erucic acid amide, ethyl dioleoyl amide, docosanoic acid amide, etc., and these examples of fatty acid amides can also be used together.

[0033] The closer the melt flow rates of the resin components or raw material resins constituting the laminate, the better the appearance. The ratio of the melt flow rates of the raw material resins mixed in the sealing layer is preferably 0.5 to 2.0, more preferably 0.8 to 1.8, and even more preferably 1.0 to 1.6. If the melt flow rate ratio is within this range, it is less likely to cause appearance defects such as layer misalignment, waviness, or unevenness.

[0034] [Middle Layer] The laminated sealant film of the present invention may also include an intermediate layer between the laminate and the sealant layer. The intermediate layer in this invention is composed of a resin composition with polypropylene resin as the main component. Furthermore, the term "main component" refers to polypropylene resin accounting for 90% by mass or more, more preferably 95% by weight or more, even more preferably 97% by weight or more, and even more preferably 99% by weight or more in the resin composition.

[0035] [Polypropylene Resin] The polypropylene resin in the intermediate layer is a resin with propylene as the main component. Examples include: propylene homopolymers, random copolymers and block copolymers of propylene with α-olefins such as ethylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, and 1-octene. Among these examples, random copolymers of propylene with α-olefins such as ethylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, and 1-octene are preferred. Furthermore, the term "main component" refers to propylene comprising 90% by weight or more, more preferably 95% by weight or more, further preferably 97% by weight or more, and even more preferably 99% by weight or more in the polypropylene resin.

[0036] The melt flow rate of the polypropylene resin constituting the intermediate layer is preferably 0.1 g / 10 min or more to 9 g / 10 min or less, more preferably 0.5 g / 10 min or more to 8 g / 10 min or less, and even more preferably 1 g / 10 min or more to 7 g / 10 min or less. The melting point of the polypropylene resin constituting the intermediate layer is preferably above 120°C to below 160°C, more preferably above 125°C to below 150°C, and even more preferably above 130°C to 140°C. The polypropylene resin constituting the intermediate layer is a resin with propylene as the main component. Examples include: propylene homopolymers, random copolymers and block copolymers of propylene with α-olefins such as ethylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, and 1-octene. Among these, random copolymers of propylene with ethylene and / or 1-butene are preferred.

[0037] The resin composition of the intermediate layer, in addition to polypropylene resins, may be, for example, at least one ethylene homopolymer selected from the group consisting of high-pressure low-density polyethylene, linear low-density polyethylene, medium-density polyethylene and high-density polyethylene. Furthermore, random or block copolymers, or mixtures of these copolymers, can be used, which are based on ethylene and copolymerized with monomers such as propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, 1-octene, vinyl acetate, (meth)acrylic acid, and (meth)acrylate. These copolymers can also be crystalline, hypocrystalline, or amorphous.

[0038] The melt flow rate of the polyethylene resin constituting the intermediate layer is preferably 0.1 g / 10 min or more to 9 g / 10 min or less, more preferably 0.5 g / 10 min or more to 8 g / 10 min or less, and even more preferably 1 g / 10 min or more to 7 g / 10 min or less. The melting point of the polyethylene resin constituting the intermediate layer is preferably above 100°C to below 140°C, more preferably above 105°C to below 135°C, and even more preferably above 110°C to below 130°C.

[0039] [Anti-adhesion agent] The resin composition in the intermediate layer may also include an anti-blocking agent, such as inorganic particles like synthetic silica, diatomaceous earth, talc, or mica; or organic particles like silicone particles, acrylic particles, nylon particles, or polyethylene particles. The average particle size of the particles used in this invention is preferably 2 μm or more, more preferably 3 μm or more, and even more preferably 5 μm or more. Furthermore, the average particle size is preferably 20 μm or less, more preferably 15 μm or less, and even more preferably 10 μm or less.

[0040] The content of particles in the resin composition of the intermediate layer, relative to the sealing layer of the membrane, is preferably 0.1% by weight or more, more preferably 0.3% by weight or more, and even more preferably 0.4% by weight or more. It is also preferably 2% by weight or less, more preferably 1.5% by weight or less, and even more preferably 1.0% by weight or less.

[0041] [Organic lubricants] In the resin composition of the intermediate layer, it is preferable to include 0.01% to 2.0% by weight of fatty acid amide as an organic lubricant, more preferably 0.05% to 1.5% by weight, and even more preferably 0.1% to 1.0% by weight. If the fatty acid amide content is less than 0.01%, the adhesion between membranes is strong, which does not meet the membrane's operability requirements. If the fatty acid amide content is 2.0% or more, the sealing strength is reduced. Examples of fatty acid amides include: erucic acid amide, ethyl dioleoyl amide, docosanoic acid amide, etc., and these examples of fatty acid amides can also be used together.

[0042] The closer the melt flow rates of the resin components or raw material resins constituting the intermediate layer, the better the appearance. The ratio of the melt flow rates of the raw material resins mixed in the sealing layer is preferably 0.5 to 2.0, more preferably 0.8 to 1.8, and even more preferably 1.0 to 1.6. If the melt flow rate ratio is within this range, it is less likely to cause appearance defects such as layer misalignment, waviness, or unevenness.

[0043] [Layer Composition] Examples of the layered sealant film structure of the present invention include: laminated layer / sealing layer, laminated layer / intermediate layer / sealing layer, and laminated layer / intermediate layer 1 / intermediate layer 2 / sealing layer. For the purposes of preventing delamination between the laminated layer and the sealing layer and facilitating the use of recycled materials, it is preferable to provide an intermediate layer between the laminated layer and the sealing layer. To prevent delamination between the laminated layer and the sealing layer, the material composition of the intermediate layer is preferably set to a material composition typical of that between the laminated layer and the sealing layer.

[0044] The greater the difference in melt flow rate between adjacent layers of raw material resin, and / or the greater the difference in melt flow rate between raw material resins mixed in each layer, the worse the appearance. The ratio of melt flow rates between adjacent layers of raw material resin is preferably 0.5 to 2.0. If the ratio of melt flow rates is within this range, it is less likely to cause appearance defects such as layer misalignment, waviness, or unevenness. Furthermore, the main peak value of the melting point of the laminated sealant film of the present invention is preferably 121°C or higher, more preferably 130°C or higher, even more preferably 140°C or higher, even more preferably 150°C or higher, and particularly preferably 160°C or higher. If the main peak value of the melting point of the film is 121°C or higher, the adaptability to high-temperature cooking is further improved.

[0045] [Manufacturing method of laminated sealant film] The invention describes in detail the manufacturing method of the laminated sealant film, but is not limited to these methods. The aforementioned resin raw materials and various additives as needed can be blended into the resin composition of the laminate and sealing layer using mixers such as Henschel mixer, Banbury mixer, and Tumbler mixer. The mixture can then be granulated using a single-shaft or bi-shaft extruder for film forming. Alternatively, the mixture can be fed into a film forming machine after the aforementioned components have been blended.

[0046] [Melted Extrusion Step] For example, the mixed resin composition is melted at a resin temperature of 110°C to 300°C, and then melt-extruded into a sheet, for example, from a T-die, and cast onto a cooling roller, where it is cooled and solidified to obtain an unstretched sheet. As a specific method for this purpose, casting onto a cooling roller is preferred. For multi-layering, multi-layer feed heads, static mixers, multi-manifold dies, and other multi-layering devices can be used. For example, a method can be listed that uses multi-layer feed heads or multi-manifold dies to stack resin delivered from two or more extruders from different flow paths into multiple layers. Methods such as using the T-die method or blow molding to form a film by melting and extruding a sheet of melt-mixed laminated resin composition can be listed, but the T-die method is particularly ideal in terms of increasing the melting temperature of the resin.

[0047] [Cooling and curing step] For example, it is preferable to cast the sheet molten and extruded from the T-die onto a cooling roller for cooling. The lower limit of the cooling roller temperature is preferably 10°C. If the above temperature is not reached, not only will the crystallization inhibition effect become saturated, but condensation and other problems will also occur, which is undesirable. The upper limit of the cooling roller temperature is preferably below 70°C. If the above temperature is exceeded, crystallization will occur, and transparency will deteriorate, which is also undesirable. Furthermore, when the cooling roller temperature is within the above range, in order to prevent condensation, it is preferable to reduce the humidity of the environment near the cooling roller beforehand. During casting, the temperature of the cooling roller surface rises due to the contact of the high-temperature resin with the surface. Typically, the cooling roller is cooled by internal piping and cooling water circulation. However, it is necessary to ensure sufficient cooling water volume, cleverly design the piping configuration, and perform maintenance to prevent sludge from adhering to the piping, in order to reduce the temperature difference in the width direction of the cooling roller surface. At this point, the thickness of the unstretched sheet is preferably in the range of 3 μm to 200 μm. The thickness of the film is preferably in the range of 5 μm to 100 μm, and more preferably in the range of 10 μm to 80 μm.

[0048] [Film characteristics] The membrane characteristics of the present invention will be described. Furthermore, in the laminated sealant membrane of the present invention, the "length direction" refers to the direction corresponding to the flow direction in the membrane manufacturing step, and the "width direction" refers to the direction orthogonal to the aforementioned flow direction in the membrane manufacturing step. Hereinafter, the "length direction" will sometimes be abbreviated as "MD direction", and the "width direction" will sometimes be abbreviated as "TD direction".

[0049] [Membrane Appearance] The laminated sealant film of the present invention requires general homogeneity and excellent appearance. For example, it is preferred to have small thickness deviation, few fisheyes or foreign objects, streaks or scratches, little color unevenness or wrinkles, and no pinholes. When measured using the method described in the examples, it is preferred that the number of foreign objects with a size of 1 mm square or more but less than 2 mm square is less than 100 per 10,000 m2, and more preferably no foreign objects larger than 1 mm square are detected.

[0050] [Haze] The haze of the laminated sealant film of the present invention is preferably 10% or less, more preferably 9% or less, further preferably 8% or less, even more preferably 7% or less, and most preferably 5% or less. If the haze exceeds 10%, there will be more streaks or scratches on the film, and the contents will become difficult to see. The haze of the laminated sealant film of the present invention is preferably 1% or more, more preferably 2% or more, and even more preferably 3% or more. If the haze is 1% or more, the adhesion strength is less likely to decrease.

[0051] [Coefficient of static friction] The static friction coefficient of the laminated sealant film of the present invention is preferably 2.0 or less, more preferably 1.0 or less, and even more preferably 0.5 or less between the sealing surfaces under a load of 0.5 kgf. When the static friction coefficient is 2.0 or more, the sliding properties between the films are insufficient, which does not meet the requirements for operability as a packaging material. Furthermore, the static friction coefficient of the laminated sealant film of the present invention is preferably 2.0 or less, more preferably 1.0 or less, and even more preferably 0.5 or less between the sealing surfaces under a load of 1.5 kgf. When the static friction coefficient is 2.0 or more, the sliding properties between the films are insufficient, which does not meet the requirements for operability as a packaging material.

[0052] [Coefficient of kinetic friction] The coefficient of dynamic friction of the laminated sealant film of the present invention is preferably 2.0 or less, more preferably 1.0 or less, and even more preferably 0.5 or less between the sealing surfaces under a load of 0.5 kgf. When the coefficient of dynamic friction is 2.0 or more, the sliding properties between the films are insufficient, which does not meet the requirements for operability as a packaging material. Furthermore, the coefficient of dynamic friction of the laminated sealant film of the present invention is preferably 2.0 or less, more preferably 1.0 or less, and even more preferably 0.5 or less between the sealing surfaces under a load of 1.5 kgf. When the coefficient of dynamic friction is 2.0 or less, the sliding properties between the films are sufficient, which easily satisfies the operability requirements as a packaging material.

[0053] [Scratch resistance] Regarding the scratch resistance of the laminated sealant film of the present invention in the friction test between the sealing surface and the laminating surface, it can be said that the smaller the change in haze before and after treatment, the better the scratch resistance. This change is preferably less than 3%, more preferably less than 2%, and even more preferably less than 1%. Furthermore, the haze of the laminated sealant film of the present invention after friction test between the sealing surface and the lamination surface is preferably less than 10%, more preferably less than 8%, even more preferably less than 6%, and most preferably less than 5%.

[0054] [Adhesion strength] The adhesion value of the laminated sealant film of the present invention is preferably below 500 N / 15 mm. When the adhesion value is below 500 N / 15 mm, bag making is easier. The adhesion value is preferably below 200 N / 15 mm, and more preferably below 100 N / 15 mm.

[0055] [Tensive Modulus] The tensile modulus of elasticity of the laminated sealant film of the present invention is preferably 200 MPa or more in the longitudinal direction, more preferably 250 MPa or more, further preferably 300 MPa or more, even more preferably 330 MPa or more, and most preferably 345 MPa or more. If the tensile modulus of elasticity is 200 MPa or more, it is easier to process into bags. The tensile modulus of elasticity in the width direction of the laminated sealant film of the present invention is preferably 200 MPa or more, more preferably 250 MPa or more, further preferably 300 MPa or more, even more preferably 330 MPa or more, and most preferably 345 MPa or more. If the tensile modulus of elasticity is 200 MPa or more, it is easier to process into bags.

[0056] [Ultimate heat seal strength] The ultimate heat-sealing strength of the laminated sealant film of the present invention is preferably 10 N / 15 mm or more, more preferably 12 N / 15 mm or more, further preferably 14 N / 15 mm or more, and even more preferably 16 N / 15 mm or more. For ordinary packaging bags, where the content is relatively heavy and a slightly stronger heat-sealing strength is required, 15 N / 15 mm or more is required.

[0057] The variation rate of the ultimate heat sealing strength of the laminated sealant film of the present invention is preferably less than 20%, more preferably less than 19%, further preferably less than 17%, and even more preferably less than 16%. To minimize the variation in ultimate heat seal strength to below 20%, one approach is to prevent peeling between the sealing layer and the laminated layer of the laminated sealant film. The condition between the sealing layer and the laminated layer can be confirmed by observing the cross-section of the test piece after the ultimate heat seal strength has been measured using a microscope.

[0058] [Heat sealing temperature] The heat sealing temperature is preferably above 60°C to below 180°C, more preferably above 70°C to below 170°C, and even more preferably above 80°C to below 160°C. The preferred heat sealing temperature system is to set the lower limit at a temperature that is at least 20°C lower than the lowest melting point of the polyethylene resin and / or polypropylene resin in the sealing layer, and the upper limit at a temperature that is at least 10°C higher than the highest melting point of the polyethylene resin and / or polypropylene resin in the laminate. The low-temperature sealing effect of the heat sealing temperature is evaluated based on the heat sealing temperature in Comparative Example 1 described below, by measuring the degree of reduction in heat sealing temperature. The low-temperature sealing performance of the heat sealing temperature is preferably above 5°C, more preferably above 10°C, further preferably above 15°C, even more preferably above 22°C, especially preferably above 25°C, and most preferably above 27°C.

[0059] [Hot viscosity] The thermal tack of the laminated sealant film of this invention is ideally characterized by a peel distance of less than 20 mm at a lower temperature. Here, "good thermal tack" refers to the sealant film maintaining sufficient sealing strength even when the resin is in a molten state. The low-temperature sealing performance of the hot-tack material is evaluated based on the hot-tack temperature in Comparative Example 1 described below, by measuring the degree of reduction in the hot-sealing temperature. The low-temperature sealing performance of the hot-tack material is preferably above 5°C, more preferably above 10°C, even more preferably above 15°C, even more preferably above 18°C, and most preferably above 20°C.

[0060] [Bag breaking strength] The burst strength of the laminated sealant film of the present invention is evaluated using bags made from the laminated sealant film. In cases where strong burst strength is required, such as for containers used for retort sterilization, it is preferably 20 kPa or more, more preferably 23 kPa or more, and even more preferably 27 kPa or more. The low-temperature sealing effect of the burst strength is evaluated based on the temperature at which the burst strength in Comparative Example 1 is 0 kPa, using the temperature at which the burst strength becomes 0 kPa. The low-temperature sealing effect of the burst strength is preferably 5°C or higher, more preferably 10°C or higher, even more preferably 15°C or higher, and even more preferably 18°C ​​or higher. [Example]

[0061] [Melting point of resin] The melting point of the resin was determined according to JIS K7121 using a differential scanning calorimeter (Seiko Instruments Ltd., DSC60). Specifically, approximately 5 mg of sample is placed in an aluminum pot, and the temperature is increased from room temperature to 200°C at a rate of 10°C / minute. After holding at 200°C for 3 minutes, the temperature is cooled to 23°C, held at 23°C for 3 minutes, and then increased to 200°C again. The maximum endothermic melting peak temperature at this point is set as the melting point. If there are more than two endothermic melting peaks, the highest endothermic melting peak temperature is set as the melting point.

[0062] [Mel flow rate] According to JIS K7112, using a thermal flow evaluation device (Shimadzu Corporation, capillary rheometer, CFT-500D), polypropylene resins were measured at 230°C, and polyethylene resins such as L-LDPE (Linear Low Density Polyethylene) were measured at 190°C.

[0063] Average particle size Inorganic particles or polyethylene particles were dispersed in ion-exchange water that had been stirred at a predetermined rotational speed (approximately 5000 rpm) using a high-speed mixer. This dispersion was then added to ISOTON (physiological saline) and further dispersed using an ultrasonic disperser. The particle size distribution was determined using the Coulter Counter method, and the volume average particle size was calculated. The refractive index was 1.30 for the physiological saline system, 1.457 for the synthetic silica and diatomaceous earth systems, and 1.54 for the polyethylene system.

[0064] [Membrane Appearance 1] Regarding the membrane's appearance, fisheyes, foreign objects, streaks, or scratches can be listed as inspection items. Fisheyes, foreign objects, streaks, or scratches are evaluated using a defect detector (FUTEC Corporation, MaxEye.X Series). The evaluation criteria are as follows: In the case of 0, it can be used without problems. In the case of △, the intended use needs to be confirmed, but in most cases it can be used without problems. In the case of ×, it can be used under the premise of the specified purpose. Measurement conditions: 〇: No fisheye or foreign object larger than 1mm square, as well as stripes or scratches, were detected. △: The number of fish eyes or foreign objects larger than 1 mm square but less than 2 mm square, as well as stripes or scratches, detected was less than 100 per 10,000 m². ×: The number of fish-eye or foreign objects with a size of 1 mm square or larger but less than 2 mm square, as well as striped or scratched foreign objects, detected is more than 100 per 10,000 m2, and / or foreign objects with a size of 2 mm square or larger are detected. Furthermore, the color of foreign objects is not considered here.

[0065] [Membrane Appearance 2] The appearance of the membrane is also evaluated using haze. [Haze] The thickness of the laminated sealant film was measured using a turbidimeter (manufactured by Nippon Denshoku Kogyo Co., Ltd., model: ZE2000) in accordance with JIS K8701. The thickness of the laminated sealant film was also measured in the same manner.

[0066] [Static friction coefficient, kinetic friction coefficient] According to JIS K7125, at 23℃ and 65%RH, the dynamic friction coefficient and static friction coefficient are determined under the following conditions. The load is set to 0.5 kgf or 1.5 kgf. The measuring surfaces are either opposite sealing surfaces or sealing surfaces and laminated surfaces. The device uses TENSILON (Toyo Baldwin Inc., STM-T-50BP).

[0067] [Scratch resistance] Refer to JIS K7316 and determine in the following order. First, the haze of the laminated sealant film is measured beforehand. Next, a 20g load was added to the flat friction assembly of the vibration abrasion testing machine (Yasuda Seiki Manufacturing Co., Ltd., Friction Testing Machine Type II, 20×20mm flat friction assembly, flat test piece stage, 100mm sliding arc length), and a 60×60mm laminated sealant film was flatly covered and fixed using the attached fixture. The same laminated sealant film was also laid on the test piece stage. Each film was arranged in the same way as when heat-sealing the sealant surface. Then, after conducting a friction test of 50 round trips (10m), the fog level was measured. Scratch resistance is evaluated by subtracting the haze level before the friction test from the haze level after the friction test.

[0068] [Adhesion strength] Determined according to ASTM-D-1893-67. First, using a hot press (manufactured by TESTER SANGYO (Co., Ltd.), model: SA-303), the laminated sealant film (10cm×15cm) with the test surfaces overlapping each other is placed with the ends of a 7cm×7cm aluminum plate (2mm thick) aligned with the center of the sample width (10cm) and 1cm inside the length direction (15cm). It is then pressurized at 50°C and a pressure of 440kgf / cm² for 15 minutes. Next, the sample that adhered during the pressure treatment was mounted on an automatic stereographic measuring instrument (manufactured by Shimadzu Corporation, model: UA-3122), and the force required to peel the adhered portion off with the aluminum rod at a speed of 200 mm / min was measured. In this case, the aluminum rod was horizontal to the peeling surface. Four measurements were performed on the same sample, and the average value is expressed.

[0069] [Tensive Modulus] According to JIS K7127, the following conditions shall be used for determination. The tensile modulus of elasticity in the membrane flow direction (MD) and the orthogonal direction (TD) was measured three times with a sample length of 100 mm, a sample width of 15 mm, a clamping distance of 20 mm, and a speed of 200 mm / min. The average value of each was set as the tensile modulus of elasticity in each direction.

[0070] [Preparation of laminated layers] A laminated layer with a biaxially stretched polypropylene film (manufactured by Toyobo Co., Ltd., PYLEN (registered trademark), P2161, 20μm) is prepared in the following manner. A dry laminating adhesive (Toyo-Morton, Inc., TM569, CAT-10L) was applied to the corona-coated surface of the biaxially stretched polypropylene film at a solids content of 3 g / m². After the solvent was evaporated in an oven at 80°C, the corona-coated surface of the laminated sealant film and the adhesive-coated surface were laminated on a temperature-controlled roller at 60°C. The laminated sealant film was then allowed to stand at 40°C for 2 days.

[0071] [Ultimate heat seal strength] According to JIS Z1707, the following conditions shall be used for determination. Using a 10mm wide sealing rod, a test sealing machine (semi-automatic die sealing machine, manufactured by Western Machinery (Co., Ltd., TYB-300) was used to heat seal the laminated sealant film formed by overlapping the layers of the laminated sealant at various temperatures: sealing pressure 0.2MPa, sealing time 1.0 second, and heat sealing temperatures of 70℃, 80℃, 90℃, 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, and 160℃. After that, the film was allowed to cool. These samples, obtained using a testing sealing machine, were cut into short strips with a heat-sealed width of 15 mm. The strips were then placed in a tensile testing machine (Instron, Universal Testing Machine, 5980 series) to determine the maximum strength at which the sealant surface was peeled off at a speed of 200 mm / min. Three measurements were performed at each temperature, and the average value was taken as the heat-sealing strength at the aforementioned heat-sealing temperature. Ultimate heat seal strength is the highest value among these heat seal strengths.

[0072] [Rate of variation in ultimate heat seal strength] The rate of change of ultimate heat seal strength is calculated using the following formula (1). The rate of change of ultimate heat seal strength = (Maximum value of ultimate heat seal strength / Minimum value of ultimate heat seal strength) / Average value of ultimate heat seal strength × 100 (%) ････(1)

[0073] [Heat sealing temperature] According to JIS Z1707, the following conditions shall be used for determination. Using a 10mm wide sealing rod, a test sealing machine (semi-automatic die sealing machine, manufactured by Western Machinery (Co., Ltd., TYB-300) was used to heat seal the laminated sealant film formed by overlapping the layers of the laminated sealant at various temperatures: sealing pressure 0.2MPa, sealing time 1.0 second, and heat sealing temperatures of 70℃, 80℃, 90℃, 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, and 160℃. After that, the film was allowed to cool. These samples, obtained using a sealing tester, were cut into short strips with a heat-sealed width of 15 mm. These strips were then placed in a tensile testing machine (Instron, universal testing machine, 5980 series) and the maximum strength at which the sealant surface was peeled off at a speed of 200 mm / min was measured. Three measurements were performed at each temperature, and the average value was taken as the heat-sealing strength at the aforementioned heat-sealing temperature. The temperature at which the heat-sealing strength reached 10 N / 15 mm was defined as the heat-sealing temperature.

[0074] [Low-temperature sealing effect at heat sealing temperature] The low-temperature sealing effect of the heat sealing temperature is evaluated by the difference (°C) between the heat sealing temperature and the heat sealing temperature in Comparative Example 1 described below. Specifically, the low-temperature sealing performance evaluation of Example 1 and Comparative Example 7 is (heat sealing temperature in Comparative Example 1: 135°C) - (heat sealing temperature in Example 1: 115°C) = 20°C and (heat sealing temperature in Comparative Example 1: 135°C) - (heat sealing temperature in Comparative Example 7: 135°C) = 0°C.

[0075] [Hot viscosity temperature] The sealant surfaces of the laminated layers were overlapped and heat-sealed for 1 second at temperatures of 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, and 160°C, with a pressure of 2 kg / cm². A 46 g load was then applied, and the distance of peeling off the seal was measured. The apparatus used was a HEAT SEAL TESTER (manufactured by TESTER SANGYO Co., Ltd., TP-701-B). The temperature at which the peeling distance of the sealing part is 20mm is set as the hot-bonding temperature.

[0076] [Low-temperature sealing effect at hot-tack temperature] The low-temperature sealing effect of the hot-tack temperature is evaluated by the difference (°C) between the hot-tack temperature and the hot-tack temperature in Comparative Example 1 described below. Specifically, the low-temperature sealing effect of Example 1 and Comparative Example 7 was evaluated as follows: (Hot-touch temperature in Comparative Example 1: 128°C) - (Hot-touch temperature in Example 1: 118°C) = 10°C and (Hot-touch temperature in Comparative Example 1: 128°C) - (Hot-seal temperature in Comparative Example 7: 135°C) = -7°C.

[0077] [Bag breaking strength] A horizontal pillow-type packaging machine (Fuji Machinery Co., Ltd., FW3301 II / B BD100) was used to cool the central seal from 160°C in 10°C intervals at a cutting length of 250mm, a height of 45mm, and a rotation speed of 40 rpm. The temperature of the end seal was kept constant at 140°C. A sponge brush (KIKULON Co., Ltd., KIKULON A (size: 75×115×36mm)) was used as the contents for bag making. Evaluation was conducted by visual appearance and burst strength (JIS Z0238 Test Methods for Heat-Sealed Flexible Packaging Bags and Semi-rigid Containers). Bursting strength was measured using a seal strength tester and a burst strength tester (Sun Scientific Co., Ltd., SEAL TESTER, FKT-100-J).

[0078] [Low-Temperature Sealing Performance Based on Bag Breakage Strength] The low-temperature sealing performance of the burst strength is evaluated by the difference (°C) between the temperature at which the burst strength in Comparative Example 1 reaches 0 kPa and the temperature at which the burst strength reaches 0 kPa. Specifically, the low-temperature sealing performance evaluation of the bag-bursting strength of Example 1 and Comparative Example 7 is as follows: (Temperature at which the bag-bursting strength in Comparative Example 1 reaches 0 kPa: 110°C) - (Temperature at which the bag-bursting strength in Example 1 reaches 0 kPa: 100°C) = 10°C, (Temperature at which the bag-bursting strength in Comparative Example 1 reaches 0 kPa: 110°C) - (Temperature at which the bag-bursting strength in Comparative Example 7 reaches 0 kPa: 130°C) = -20°C.

[0079] [propylene copolymer] PP-1: FL6745A (manufactured by Sumitomo Chemical Co., Ltd., NOBLEN (registered trademark), propylene-ethylene-butene random copolymer, melting point 132℃, melt flow rate 6.0 g / 10 min). PP-2:F744NP (manufactured by Prime Polymer Inc., PRIME POLYPRO (registered trademark), ethylene-propylene random copolymer, melting point 133℃, melt flow rate 7.0 g / 10 min). PP-3:FS2011DG3 (manufactured by Sumitomo Chemical Co., Ltd., NOBLEN (registered trademark), propylene random copolymer, melting point 158℃, melt flow rate 2.5g / 10min). PP-4: WF893R9 (manufactured by Sumitomo Chemical Co., Ltd., NOBLEN (registered trademark), propylene random copolymer, melting point 137℃, melt flow rate 7.0 g / 10 min). PP-5: FLX64G2 (manufactured by Sumitomo Chemical Co., Ltd., NOBLEN (registered trademark), propylene-ethylene-butene random copolymer, melting point 138℃, melt flow rate 7.0 g / 10 min). PP-6: F-201SPB (manufactured by Prime Polymer Inc., PRIME POLYPRO (registered trademark), propylene random copolymer, melting point 160℃, melt flow rate 2.0 g / 10 min).

[0080] [Ethylene-based copolymers] PE-1: FV401 (manufactured by Sumitomo Chemical Co., Ltd., SUMIKATHENE (registered trademark) E, linear low-density polyethylene resin, melting point 112℃, melt flow rate 3.8g / 10min). PE-2: FV402 (manufactured by Sumitomo Chemical Co., Ltd., SUMIKATHENE (registered trademark) E, linear low-density polyethylene resin, melting point 115℃, melt flow rate 3.8g / 10min). PE-3: FV403 (manufactured by Sumitomo Chemical Co., Ltd., SUMIKATHENE (registered trademark) E, linear low-density polyethylene resin, melting point 117℃, melt flow rate 3.8g / 10min). PE-4: FV405 (manufactured by Sumitomo Chemical Co., Ltd., SUMIKATHENE (registered trademark) E, linear low-density polyethylene resin, melting point 118℃, melt flow rate 3.8g / 10min). PE-5: FV407 (manufactured by Sumitomo Chemical Co., Ltd., SUMIKATHENE (registered trademark) E, linear low-density polyethylene resin, melting point 124℃, melt flow rate 3.2g / 10min). PE-6:FV104 (manufactured by Sumitomo Chemical Co., Ltd., SUMIKATHENE (registered trademark), linear low-density polyethylene resin, melting point 121℃, melt flow rate 1.0g / 10min). PE-7:3600F (manufactured by Prime Polymer Inc., Evolue (registered trademark), high-density polyethylene resin, melting point 133℃, melt flow rate 1.0g / 10min). PE-8:031GLD (manufactured by Ube Maruzen Polyethylene (Industrial and Commercial Corporation), UMERIT (registered trademark), linear low-density polyethylene resin, melting point 100℃, melt flow rate 10.0g / 10min). PE-9:M12P (manufactured by Mitsui Chemicals, Inc., ULTZEX (registered trademark), low-density polyethylene resin, melting point 114℃, melt flow rate 3.0g / 10min).

[0081] [Anti-adhesion agent] Synthetic silicon dioxide: KMP130-2 (average particle size 2μm, Shin-Etsu Chemical Industry Co., Ltd.) Diatomite: Dicalite Wf (average particle size 4μm, manufactured by Grefco. Inc.) Ultra-high molecular weight polyethylene particles: PM200 (average particle size 10μm, manufactured by Mitsui Chemicals, Inc.).

[0082] [Organic lubricants] Erucamide: Trademark name Diamid L-200 (melting point 81°C, manufactured by Mitsubishi Chemical Corporation). Doctimethylamine: Trademark name D1007 (melting point 110°C, manufactured by Tokyo Chemical Industry Co., Ltd.).

[0083] [Masterbatch] 1) Silica masterbatch: A masterbatch containing 15% by weight of silica was prepared by mixing NOBLEN (registered trademark) FL6745 mixed silica (manufactured by Shin-Etsu Chemical Industry Co., Ltd., KMP-130-2, average particle size 2μm) manufactured by Sumitomo Chemical Co., Ltd. 2) Diatomite Masterbatch: A masterbatch containing 12% by weight of diatomite was prepared from NOBLEN (registered trademark) FL6745 mixed diatomite (manufactured by Grefco. Inc., Dicalite WF, average particle size 4μm) manufactured by Sumitomo Chemical Co., Ltd. 3) Ultra-high molecular weight polyethylene particle masterbatch: Mix NOBLEN (registered trademark) FL6745 manufactured by Sumitomo Chemical Co., Ltd. with ultra-high molecular weight polyethylene particles (manufactured by Mitsui Chemicals Co., Ltd., MIPELON PM200, average particle size 10μm) to produce a masterbatch containing 10% by weight of ultra-high molecular weight polyethylene particles. 4) Erucamide Masterbatch: Prepare a masterbatch containing 5% by weight of erucamide by mixing NOBLEN (registered trademark) FL6745 manufactured by Sumitomo Chemical Co., Ltd. 5) Docosamide Masterbatch: Mix NOBLEN (registered trademark) FL6745 manufactured by Sumitomo Chemical Co., Ltd. with docosamide to produce a masterbatch containing 2% by weight of docosamide.

[0084] [Examples 1 to 6] The laminate and intermediate layer were made from FL6745A. The sealing layer was made from the resins and additives shown in Table 1. Each layer was melted at 240°C using three extruders, filtered through a sintered filter with a filtration precision of 60 μm, and then co-extruded into sheets through a T-die. The laminate, intermediate layer, and sealing layer were melt-extruded at a thickness ratio of 25:50:25 vol.%, cooled and cured using a 30°C cooling roller, and then wound into a roll at a speed of 20 m / min to obtain a 30 μm thick laminated sealant film with a wetting tension of 45 mN / m. The evaluation results are shown in Table 1.

[0085] The laminated sealant films obtained in Examples 1 to 6 exhibit excellent low-temperature sealing and hot tack properties, demonstrate stable anti-adhesion and coefficient of friction, and also show good appearance and scratch resistance. Furthermore, film processing is also unaffected, and sufficient burst strength can be obtained. Example 4, in particular, demonstrates exceptionally excellent scratch resistance.

[0086] [Examples 7 to 11] The laminate system used FL8115 as raw material, and the intermediate layer system used FL6745A as raw material. The sealing layer system used the resins and additives shown in Table 2 as raw materials. Three extruders were used for each, each melted at 240°C and filtered through a sintered filter with a filtration precision of 60 μm before co-extrusion into sheets via a T-die. The laminate, intermediate layer, and sealing layer were melt-extruded at a thickness ratio of 25:50:25 vol.%, cooled and cured using a 30°C cooling roller, and then wound into a roll at a speed of 20 m / min to obtain a 30 μm thick laminated sealant film with a wetting tension of 45 mN / m. The evaluation results are shown in Table 2.

[0087] The laminated sealant films obtained in Examples 7 to 11 exhibit excellent low-temperature sealing and hot tack properties, demonstrate stable anti-adhesion and coefficient of friction, and also show good appearance and scratch resistance. Furthermore, film processing is also unaffected, and sufficient burst strength can be obtained.

[0088] [Example 12] The laminate and intermediate layer were made from FL8115. The sealing layer was made from the resins and additives shown in Table 2. Each layer was melted at 240°C using three extruders, filtered through a sintered filter with a filtration precision of 60 μm, and then co-extruded into sheets through a T-die. The laminate, intermediate layer, and sealing layer were melt-extruded at a thickness ratio of 20:60:20 vol.%, cooled and solidified using a 30°C cooling roller, and then wound into a roll at a speed of 20 m / min to obtain a 30 μm thick laminated sealant film with a wetting tension of 45 mN / m. The evaluation results are shown in Table 2.

[0089] The laminated sealant film obtained in Example 12 exhibits excellent low-temperature sealing and hot tack, demonstrates stable anti-adhesion and coefficient of friction, and also shows good appearance and scratch resistance. Furthermore, the film processing properties are also excellent, and sufficient burst strength can be obtained.

[0090] [Comparative Examples 1 to 10] Polypropylene resin films were obtained using the resins and additives shown in Tables 3 and 4 in the same manner as in Example 1. The evaluation results are shown in Tables 3 and 4. The film obtained in Comparative Example 1 exhibited poor low-temperature sealing performance in terms of heat sealing temperature, heat adhesion, and bag-breaking strength. The film obtained in Comparative Example 2 exhibited poor low-temperature sealing performance among the heat sealing temperature, heat adhesion, and bag-breaking strength. The film obtained in Comparative Example 3 had poor sliding properties and uneven heat sealing temperature, resulting in insufficient bag-making performance. The membrane obtained in Comparative Example 4 exhibited poor low-temperature sealing performance in terms of bag breakage strength. The membrane obtained in Comparative Example 5 exhibited poor low-temperature sealing performance in terms of bag breakage strength. The appearance of the membrane obtained in Comparative Example 6 was poor. The membrane obtained in Comparative Example 7 had poor appearance and low-temperature sealing performance in terms of bag breakage strength. The membrane obtained in Comparative Example 8 had poor ultimate heat sealing strength, adhesion resistance, and scratch resistance. The films obtained in Comparative Examples 9 and 10 exhibited poor low-temperature sealing performance in terms of ultimate heat sealing strength, adhesion resistance, scratch resistance, bag strength, and bag strength.

[0091] [Table 1] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 PP-1: A random copolymer of propylene, ethylene, and butene, with a Tm of 132℃ and an MFR of 6.0 g / 10 min. weight% 54.2 14.2 13.9 0.2 14.2 14.2 PP-2: ethylene-propylene random copolymer, Tm=133℃, MFR=7.0g / 10min weight% PP-3: a random copolymer of propylene and ethylene, Tm=158℃, MFR=2.5g / 10min weight% PP-4: a random copolymer of propylene, Tm=137℃, MFR=7.0g / 10min weight% PP-5: a random copolymer of propylene, ethylene, and butene, with a Tm of 138℃ and an MFR of 7.0 g / 10 min. weight% PP-6: a random copolymer of propylene, Tm=160℃, MFR=2.0g / 10min weight% PE-1: Linear low-density polyethylene, Tm=112℃, MFR=3.8g / 10min weight% 40.0 80.0 80.0 94.0 PE-2: Linear low-density polyethylene, Tm=115℃, MFR=3.8g / 10min weight% 80.0 PE-3: Linear low-density polyethylene, Tm=117℃, MFR=3.8g / 10min weight% 80.0 PE-4: Linear low-density polyethylene, Tm=118℃, MFR=3.8g / 10min weight% PE-5: Linear low-density polyethylene, Tm=124℃, MFR=3.2g / 10min weight% PE-6: Linear low-density polyethylene, Tm=121℃, MFR=1.0g / 10min weight% PE-7: High-density polyethylene, Tm=133℃, MFR=1.0g / 10min weight% PE-8: Linear medium-density polyethylene, Tm=100℃, MFR=10.0g / 10min weight% PE-9: Low-density polyethylene, Tm=114℃, MFR=3.0g / 10min weight% The content (by weight%) of polypropylene resin relative to the mixture of polypropylene resin and polyethylene resin per 100% weight. weight% 59.5 19.5 19.5 5.5 19.5 19.5 ratio of melt flow rate g / 10min 1.6 1.6 1.6 1.6 1.6 1.6 Difference in melting point ℃ 20 20 20 20 17 15 Silicon dioxide masterbatch weight% 1.0 1.0 1.0 1.0 1.0 1.0 diatomaceous earth masterbatch weight% 1.7 1.7 0 1.7 1.7 1.7 Ultra-high molecular weight polyethylene masterbatch weight% 0.0 0.0 2.0 0.0 0.0 0.0 Erucic acid amide masterbatch weight% 1.7 1.7 1.7 1.7 1.7 1.7 Doctinomycin masterbatch weight% 1.4 1.4 1.4 1.4 1.4 1.4 The average particle size of silicon dioxide is 2 μm. [ppm] 1500 1500 1500 1500 1500 1500 The average particle size of diatomaceous earth is 4 μm. [ppm] 2040 2040 0 2040 2040 2040 The average particle size of ultra-high molecular weight polyethylene is 10 μm. [ppm] 0 0 2000 0 0 0 Erucamide [ppm] 850 850 850 850 850 850 Docosylamine [ppm] 280 280 280 280 280 280 Arithmetic mean melting point of sealing layer resin [℃] 116 108 108 106 111 112 Appearance Evaluation 1 (Fisheye, foreign objects, stripes, scratches) [-] 〇 〇 〇 〇 〇 〇 Appearance rating 2 (haze) [%] 6.2 3.4 3.8 3.2 3.1 3.1 static friction coefficient Sealing surface / Sealing surface @ 0.5kg [-] 0.1 0.21 0.18 0.21 0.22 0.21 coefficient of kinetic friction Sealing surface / Sealing surface @ 0.5kg [-] 0.07 0.14 0.1 0.14 0.18 0.17 static friction coefficient Sealing surface / Sealing surface @ 1.5kg [-] 0.34 0.43 0.45 0.43 0.35 0.33 coefficient of kinetic friction Sealing surface / Sealing surface @ 1.5kg [-] 0.26 0.39 0.31 0.39 0.28 0.29 Scratch resistance Haze after friction test [%] 8.7 5.5 4.1 5.6 5.6 5.6 Change in haze before and after friction test [%] 2.5 2.1 0.3 2.4 2.5 2.5 Adhesion strength [N / 15mm] 88 86 86 86 90 83 tensile modulus of elasticity Length direction GPa 360 340 340 330 340 350 Width direction GPa 370 350 350 340 350 360 Ultimate heat seal strength strength [N / 15mm] 18 15 15 15 15 15 rate of change % 6.2 8.1 8.1 7.6 8.1 8.7 Heat sealing temperature Temperature when it reaches 10N / 15mm [℃] 115 105 105 105 108 110 Low temperature sealing effect [℃] 20 30 30 30 27 25 Hot viscosity temperature Temperature when the peeling distance is 20mm [℃] 118 106 106 106 105 108 Low temperature sealing effect [℃] 10 twenty two twenty two twenty two twenty three 20 Tension strength Bag making (center sealing temperature 160℃) [kPa] 33 31 31 31 33 34 Bag making (center sealing temperature 150℃) [kPa] 34 31 31 31 35 38 Bag making (center sealing temperature 140℃) [kPa] 30 29 29 29 33 36 Bag making (center sealing temperature 130℃) [kPa] 27 27 27 27 28 30 Bag making (center sealing temperature 120℃) [kPa] twenty four 25 25 25 25 20 Bag making (center sealing temperature 110℃) [kPa] 17 twenty three twenty three twenty three 12 10 Bag making (center sealing temperature 100℃) [kPa] 0 16 16 16 0 0 Bag making (center sealing temperature 90℃) [kPa] — 0 0 0 — — Low temperature sealing effect [℃] 10 20 20 20 10 10

[0092] [Table 2] Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 PP-1: A random copolymer of propylene, ethylene, and butene, with a Tm of 132℃ and an MFR of 6.0 g / 10 min. weight% 73.2 53.2 33.2 13.2 3.2 0.3 PP-2: ethylene-propylene random copolymer, Tm=133℃, MFR=7.0g / 10min weight% PP-3: a random copolymer of propylene and ethylene, Tm=158℃, MFR=2.5g / 10min weight% PP-4: a random copolymer of propylene, Tm=137℃, MFR=7.0g / 10min weight% PP-5: a random copolymer of propylene, ethylene, and butene, with a Tm of 138℃ and an MFR of 7.0 g / 10 min. weight% PP-6: a random copolymer of propylene, Tm=160℃, MFR=2.0g / 10min weight% PE-1: Linear low-density polyethylene, Tm=112℃, MFR=3.8g / 10min weight% 20.0 40.0 60.0 80.0 90.0 78.0 PE-2: Linear low-density polyethylene, Tm=115℃, MFR=3.8g / 10min weight% PE-3: Linear low-density polyethylene, Tm=117℃, MFR=3.8g / 10min weight% PE-4: Linear low-density polyethylene, Tm=118℃, MFR=3.8g / 10min weight% PE-5: Linear low-density polyethylene, Tm=124℃, MFR=3.2g / 10min weight% PE-6: Linear low-density polyethylene, Tm=121℃, MFR=1.0g / 10min weight% PE-7: High-density polyethylene, Tm=133℃, MFR=1.0g / 10min weight% PE-8: Linear medium-density polyethylene, Tm=100℃, MFR=10.0g / 10min weight% PE-9: Low-density polyethylene, Tm=114℃, MFR=3.0g / 10min weight% The content (by weight%) of polypropylene resin relative to the mixture of polypropylene resin and polyethylene resin per 100% weight. weight% 79.5 59.5 39.5 19.5 9.5 20.7 ratio of melt flow rate g / 10min 1.6 1.6 1.6 1.6 1.6 1.6 Difference in melting point ℃ 20 20 20 20 20 20 Silicon dioxide masterbatch weight% 0.0 0.0 0.0 0.0 0.0 0.0 diatomaceous earth masterbatch weight% 1.7 1.7 1.7 1.7 1.7 4.2 Ultra-high molecular weight polyethylene masterbatch weight% 2.0 2.0 2.0 2.0 2.0 4.5 Erucic acid amide masterbatch weight% 1.7 1.7 1.7 1.7 1.7 3.0 Doctinomycin masterbatch weight% 1.4 1.4 1.4 1.4 1.4 10.0 The average particle size of silicon dioxide is 2 μm. [ppm] 0 0 0 0 0 0 The average particle size of diatomaceous earth is 4μm. [ppm] 2040 2040 2040 2040 2040 5040 The average particle size of ultra-high molecular weight polyethylene is 10 μm. [ppm] 2000 2000 2000 2000 2000 4500 Erucamide [ppm] 850 850 850 850 850 1500 Docosylamine [ppm] 280 280 280 280 280 2000 Arithmetic mean melting point of sealing layer resin [℃] 120 117 114 111 110 〇 Appearance Evaluation 1 (Fisheye, foreign objects, stripes, scratches) [-] 〇 〇 〇 〇 〇 〇 Appearance rating 2 (haze) [%] 8 6.6 5.2 3.8 3.6 5.1 static friction coefficient Sealing surface / Sealing surface @ 0.5kg [-] 0.19 0.18 0.2 0.18 0.2 0.15 coefficient of kinetic friction Sealing surface / Sealing surface @ 0.5kg [-] 0.13 0.12 0.09 0.1 0.12 0.14 static friction coefficient Sealing surface / Sealing surface @ 1.5kg [-] 0.42 0.38 0.4 0.45 0.39 0.31 coefficient of kinetic friction Sealing surface / Sealing surface @ 1.5kg [-] 0.4 0.32 0.33 0.31 0.33 0.28 Scratch resistance Haze after friction test [%] 4.3 4.4 4.2 4.1 4.2 5.9 Change in haze before and after friction test [%] 0.3 0.3 0.4 0.3 0.4 0.2 Adhesion strength [N / 15mm] 84 87 85 86 90 69 tensile modulus of elasticity Length direction GPa 490 470 450 430 420 560 Width direction GPa 500 480 460 440 430 600 Ultimate heat seal strength strength [N / 15mm] 17 18 15 15 15 15 rate of change % 7.0 6.2 7.7 8.1 8.5 8.0 Heat sealing temperature Temperature when it reaches 10N / 15mm [℃] 120 115 110 105 105 105 Low temperature sealing effect [℃] 15 20 25 30 30 30 Hot viscosity temperature Temperature when the peeling distance is 20mm [℃] 124 118 112 106 103 106 Low temperature sealing effect [℃] 4 10 16 twenty two 25 twenty two Tension strength Bag making (center sealing temperature 160℃) [kPa] 30 33 32 31 32 31 Bag making (center sealing temperature 150℃) [kPa] 29 34 33 31 30 31 Bag making (center sealing temperature 140℃) [kPa] 27 30 29 29 28 29 Bag making (center sealing temperature 130℃) [kPa] 25 27 27 27 26 27 Bag making (center sealing temperature 120℃) [kPa] 20 twenty four 25 25 25 25 Bag making (center sealing temperature 110℃) [kPa] 13 17 20 twenty three twenty four twenty three Bag making (center sealing temperature 100℃) [kPa] 0 0 10 16 19 16 Bag making (center sealing temperature 90℃) [kPa] — — 0 0 0 0 Low temperature sealing effect [℃] 10 10 20 20 20 20

[0093] [Table 3] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 PP-1: A random copolymer of propylene, ethylene, and butene, with a Tm of 132℃ and an MFR of 6.0 g / 10 min. weight% 94.2 93.9 14.2 14.2 PP-2: ethylene-propylene random copolymer, Tm=133℃, MFR=7.0g / 10min weight% 51.2 PP-3: a random copolymer of propylene and ethylene, Tm=158℃, MFR=2.5g / 10min weight% PP-4: a random copolymer of propylene, Tm=137℃, MFR=7.0g / 10min weight% PP-5: a random copolymer of propylene, ethylene, and butene, with a Tm of 138℃ and an MFR of 7.0 g / 10 min. weight% PP-6: a random copolymer of propylene, Tm=160℃, MFR=2.0g / 10min weight% PE-1: Linear low-density polyethylene, Tm=112℃, MFR=3.8g / 10min weight% 94.2 PE-2: Linear low-density polyethylene, Tm=115℃, MFR=3.8g / 10min weight% PE-3: Linear low-density polyethylene, Tm=117℃, MFR=3.8g / 10min weight% PE-4: Linear low-density polyethylene, Tm=118℃, MFR=3.8g / 10min weight% 80.0 PE-5: Linear low-density polyethylene, Tm=124℃, MFR=3.2g / 10min weight% 80.0 PE-6: Linear low-density polyethylene, Tm=121℃, MFR=1.0g / 10min weight% 43.0 PE-7: High-density polyethylene, Tm=133℃, MFR=1.0g / 10min weight% PE-8: Linear medium-density polyethylene, Tm=100℃, MFR=10.0g / 10min weight% PE-9: Low-density polyethylene, Tm=114℃, MFR=3.0g / 10min weight% The content (by weight%) of polypropylene resin relative to the mixture of polypropylene resin and polyethylene resin per 100% weight. weight% 99.5 99.5 5.3 19.5 19.5 56.5 ratio of melt flow rate g / 10min 1.0 1.0 1.0 1.6 1.9 7.0 Difference in melting point ℃ 0 0 0 14 8 12 Silicon dioxide masterbatch weight% 1.0 1.0 1.0 1.0 1.0 1.0 diatomaceous earth masterbatch weight% 1.7 0.0 1.7 1.7 1.7 1.7 Ultra-high molecular weight polyethylene masterbatch weight% 0.0 2.0 0.0 0.0 0.0 0.0 Erucic acid amide masterbatch weight% 1.7 1.7 1.7 1.7 1.7 1.7 Doctinomycin masterbatch weight% 1.4 1.4 1.4 1.4 1.4 1.4 The average particle size of silicon dioxide is 2 μm. [ppm] 1500 1500 1500 1500 1500 1500 The average particle size of diatomaceous earth is 4μm. [ppm] 2040 0 2040 2040 2040 2040 The average particle size of ultra-high molecular weight polyethylene is 10 μm. [ppm] 0 2000 0 0 0 0 Erucamide [ppm] 850 850 850 850 850 850 Docosylamine [ppm] 280 280 280 280 280 280 Arithmetic mean melting point of sealing layer resin [℃] 130 130 112 113 125 120 Appearance Evaluation 1 (Fisheye, foreign objects, stripes, scratches) [-] 〇 〇 〇 〇 〇 × Appearance rating 2 (haze) [%] 3.5 4.0 3.1 3.1 3.1 6.3 static friction coefficient Sealing surface / Sealing surface @ 0.5kg [-] 0.17 0.08 0.23 0.21 0.20 0.20 coefficient of kinetic friction Sealing surface / Sealing surface @ 0.5kg [-] 0.17 0.08 0.15 0.17 0.18 0.10 static friction coefficient Sealing surface / Sealing surface @ 1.5kg [-] 0.69 0.45 0.49 0.33 0.30 0.40 coefficient of kinetic friction Sealing surface / Sealing surface @ 1.5kg [-] 0.69 0.44 0.41 0.29 0.29 0.30 Scratch resistance Haze after friction test [%] 7.1 4.3 5.4 5.6 5.7 8.5 Change in haze before and after friction test [%] 3.6 0.3 2.3 2.5 2.6 2.2 Adhesion strength [N / 15mm] 90 87 87 83 85 89 tensile modulus of elasticity Length direction GPa 460 460 330 370 380 380 Width direction GPa 430 430 340 380 390 390 Ultimate heat seal strength strength [N / 15mm] 25 25 15 15 15 18 rate of change % 4.3 4.7 15.0 9.3 10.0 6.9 Heat sealing temperature Temperature when it reaches 10N / 15mm [℃] 135 135 95 111 117 120 Low temperature sealing effect [℃] 0 0 40 twenty four 18 15 Hot viscosity temperature Temperature when the peeling distance is 20mm [℃] 128 128 98 109 121 120 Low temperature sealing effect [℃] 0 0 30 19 7 8 Tension strength Bag making (center sealing temperature 160℃) [kPa] 36 36 27 34 35 33 Bag making (center sealing temperature 150℃) [kPa] 41 41 28 38 40 34 Bag making (center sealing temperature 140℃) [kPa] 35 35 29 36 36 30 Bag making (center sealing temperature 130℃) [kPa] 29 29 27 30 30 28 Bag making (center sealing temperature 120℃) [kPa] 17 17 25 20 19 twenty three Bag making (center sealing temperature 110℃) [kPa] 0 0 twenty four 0 0 17 Bag making (center sealing temperature 100℃) [kPa] — — 17 — — 0 Bag making (center sealing temperature 90℃) [kPa] — — 0 — — — Low temperature sealing effect [℃] 0 0 20 0 0 10

[0094] [Table 4] Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 PP-1: A random copolymer of propylene, ethylene, and butene, with a Tm of 132℃ and an MFR of 6.0 g / 10 min. weight% PP-2: ethylene-propylene random copolymer, Tm=133℃, MFR=7.0g / 10min weight% PP-3: a random copolymer of propylene and ethylene, Tm=158℃, MFR=2.5g / 10min weight% 64.2 PP-4: a random copolymer of propylene, Tm=137℃, MFR=7.0g / 10min weight% 60.0 PP-5: a random copolymer of propylene, ethylene, and butene, with a Tm of 138℃ and an MFR of 7.0 g / 10 min. weight% 3.0 PP-6: a random copolymer of propylene, Tm=160℃, MFR=2.0g / 10min weight% 10.0 PE-1: Linear low-density polyethylene, Tm=112℃, MFR=3.8g / 10min weight% PE-2: Linear low-density polyethylene, Tm=115℃, MFR=3.8g / 10min weight% PE-3: Linear low-density polyethylene, Tm=117℃, MFR=3.8g / 10min weight% PE-4: Linear low-density polyethylene, Tm=118℃, MFR=3.8g / 10min weight% PE-5: Linear low-density polyethylene, Tm=124℃, MFR=3.2g / 10min weight% PE-6: Linear low-density polyethylene, Tm=121℃, MFR=1.0g / 10min weight% PE-7: High-density polyethylene, Tm=133℃, MFR=1.0g / 10min weight% 30.0 PE-8: Linear medium-density polyethylene, Tm=100℃, MFR=10.0g / 10min weight% 40.0 PE-9: Low-density polyethylene, Tm=114℃, MFR=3.0g / 10min weight% 97.0 90.0 The content (by weight%) of polypropylene resin relative to the mixture of polypropylene resin and polyethylene resin per 100% weight. weight% 69.5 60.0 3.0 10.0 ratio of melt flow rate g / 10min 2.5 0.7 2.3 0.7 Difference in melting point ℃ 25 37 twenty four 46 Silicon dioxide masterbatch weight% 1.0 0.0 0.0 0.0 diatomaceous earth masterbatch weight% 1.7 0.0 0.0 0.0 Ultra-high molecular weight polyethylene masterbatch weight% 0.0 0.0 0.0 0.0 Erucic acid amide masterbatch weight% 1.7 0.0 0.0 0.0 Doctinomycin masterbatch weight% 1.4 0.0 0.0 0.0 The average particle size of silicon dioxide is 2 μm. [ppm] 1500 0 0 0 The average particle size of diatomaceous earth is 4μm. [ppm] 2040 0 0 0 The average particle size of ultra-high molecular weight polyethylene is 10 μm. [ppm] 0 0 0 0 Erucamide [ppm] 850 0 0 0 Docosylamine [ppm] 280 0 0 0 Arithmetic mean melting point of sealing layer resin [℃] 141 122 115 119 Appearance Evaluation 1 (Fisheye, foreign objects, stripes, scratches) [-] × 〇 × 〇 Appearance rating 2 (haze) [%] 5.4 6 3 3 static friction coefficient Sealing surface / Sealing surface @ 0.5kg [-] 0.20 >2 >2 >2 coefficient of kinetic friction Sealing surface / Sealing surface @ 0.5kg [-] 0.10 >2 >2 >2 static friction coefficient Sealing surface / Sealing surface @ 1.5kg [-] 0.40 >2 >2 >2 coefficient of kinetic friction Sealing surface / Sealing surface @ 1.5kg [-] 0.30 >2 >2 >2 Scratch resistance Haze after friction test [%] 7.8 9 12 12 Change in haze before and after friction test [%] 2.4 15 15 15 Adhesion strength [N / 15mm] 89 >1000 >1000 >1000 tensile modulus of elasticity Length direction GPa 400 290 340 350 Width direction GPa 410 300 350 360 Ultimate heat seal strength strength [N / 15mm] 16 14.1 9.3 1.6 rate of change % 8.6 10.9 35.8 270.8 Heat sealing temperature Temperature when it reaches 10N / 15mm [℃] 135 106 The sealing strength did not reach 10N / 15mm The sealing strength did not reach 10N / 15mm Low temperature sealing effect [℃] 0 29 The ultimate sealing strength is too low to be calculated. The ultimate sealing strength is too low to be calculated. Hot viscosity temperature Temperature when the peeling distance is 20mm [℃] 135 118 The ultimate sealing strength is too low to be calculated. The ultimate sealing strength is too low to be calculated. Low temperature sealing effect [℃] -7 10 The ultimate sealing strength is too low to be calculated. The ultimate sealing strength is too low to be calculated. Tension strength Bag making (center sealing temperature 160℃) [kPa] 27 33 16 17 Bag making (center sealing temperature 150℃) [kPa] twenty three 34 16 17 Bag making (center sealing temperature 140℃) [kPa] 10 30 16 17 Bag making (center sealing temperature 130℃) [kPa] 0 27 14 15 Bag making (center sealing temperature 120℃) [kPa] — twenty four 13 13 Bag making (center sealing temperature 110℃) [kPa] — 17 12 12 Bag making (center sealing temperature 100℃) [kPa] — 0 8 9 Bag making (center sealing temperature 90℃) [kPa] — 0 0 0 Low temperature sealing effect [℃] -20 10 20 20 [Industry Availability]

[0095] The laminated sealing film of this invention exhibits excellent low-temperature bag-making properties, making it suitable as packaging material for a variety of commodities, including food, beverages, pharmaceuticals, and chemicals. It is particularly suitable for use in pillow-type packaging bags, side-sealed packaging bags, or three-side-sealed packaging bags, where the contents are packaged while the bag is automatically formed.

Claims

1. A laminated sealant film, simultaneously satisfying the following 1) to 10): 1) comprising at least a laminated layer and a sealing layer; 2) the laminated layer is composed of a resin composition mainly composed of a polypropylene resin; 3) the sealing layer is composed of a resin composition mainly composed of a mixture of a polypropylene resin and a polyethylene resin; 4) relative to 100% by weight of the mixture of the polypropylene resin and polyethylene resin constituting the sealing layer, it comprises 1% to 90% by weight of polypropylene resin and 10% to 99% by weight of polyethylene resin; 5) the polyethylene resin constituting the sealing layer comprises 90% or more of linear polyethylene resin; 6) the difference in melting point between the polypropylene resin and the linear polyethylene resin of the sealing layer is 15°C or more; 7) the ratio of the melt flow rate of the polypropylene resin of the sealing layer to the melt flow rate of the linear polyethylene resin is 0.5 to 2.0 or less; 8) The melt flow rate of the polypropylene resin and linear polyethylene resin of the sealing layer is less than 9 g / 10 min; 9) The aforementioned laminated sealant film is an unstretched sheet; 10) The tensile modulus of elasticity in the longitudinal direction of the aforementioned laminated sealant film does not reach 600 MPa.

2. The laminated sealant film as described in claim 1, wherein the aforementioned polypropylene resin is a random copolymer of propylene.

3. The laminated sealant film as described in claim 1 or 2, wherein the main peak value of the melting point of the aforementioned laminated sealant film is above 120°C.

4. The laminated sealant film as described in claim 1 or 2, wherein the static friction coefficient between the sealing surfaces is less than 0.

5.

5. The laminated sealant film as described in claim 1 or 2, wherein the coefficient of dynamic friction between the sealing surfaces is 0.5 or less.

6. The laminated sealant film as described in claim 1 or 2, wherein the aforementioned sealant layer contains organic particles as an anti-blocking agent.

7. The laminated sealant film as described in claim 1 or 2, wherein the aforementioned sealant layer contains two or more fatty acid amides as organic lubricants.