Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/38—Packaging materials of special type or form
  • B65D65/40—Applications of laminates for particular packaging purposes

Definitions

• the present invention relates to a polypropylene-based laminated sealant film that is resistant to delamination and has excellent low-temperature bag-making properties.
• packaging materials have been developed for the contents of many products, including foods, beverages, pharmaceuticals, and chemicals.
• Packaging materials are used in a variety of forms, such as pillow packaging, gusset packaging, and three-sided sealed packaging, and the sealant films used in packaging materials also have the functions required for their applications.
• Sealant films are particularly suitable for automatically making pillowcase bags, gusset bags, or three-sided sealed bags while packaging the contents, and the lower the temperature at which heat sealing can be performed, the lower the electricity bill and the better the workability, as there is less risk of burns.
• low-temperature heat sealing increases packaging and bag-making speeds and reduces packaging material waste, resulting in cleaner finished packaging bags.
• the object of the present invention is to provide a polypropylene-based laminated sealant film that is less prone to delamination and has excellent low-temperature bag-making properties. Therefore, the object of the present invention is to provide a polypropylene-based laminated sealant film that is less prone to delamination and has excellent low-temperature bag-making properties.
• the laminated sealant film according to the embodiment is as follows [1], and preferably any one of [2] to [12].
• a laminated sealant film that satisfies all of the following requirements 1) to 7). 1) It comprises at least a laminate layer, an intermediate layer, and a seal layer, in that order. 2) The laminate layer and the intermediate layer each comprise a polypropylene-based resin composition, and the seal layer comprises a resin composition containing a 1-butene copolymer. 3) The ratio of the melt flow rate of the polypropylene resin composition of the intermediate layer to the melt flow rate of the polypropylene resin composition of the laminate layer is 0.6 or more and 2.0 or less.
• the ratio of the melt flow rate of the polypropylene resin composition of the intermediate layer to the melt flow rate of the resin composition containing a 1-butene copolymer of the seal layer is 0.6 or more and 3.5 or less.
• the polypropylene-based resin composition of the laminate layer, the polypropylene-based resin composition of the intermediate layer, and the resin composition containing a 1-butene copolymer of the seal layer each have a melt flow rate of 1 g/10 min (load 2.16 kgf) or more and 9 g/10 min (load 2.16 kgf) or less, respectively.
• the melting point of the resin composition containing the 1-butene copolymer in the sealing layer is 50° C. or higher and 140° C. or lower.
• the tensile modulus in the longitudinal direction is 600 MPa or less.
• the polypropylene-based resin composition of the laminate layer and the polypropylene-based resin composition of the intermediate layer contain a polypropylene-based resin, and the polypropylene-based resin is a propylene random copolymer.
• the resin composition containing the 1-butene copolymer of the seal layer contains a polypropylene-based resin, and the polypropylene-based resin is a propylene random copolymer.
• the present invention provides a polypropylene-based laminated sealant film that is resistant to delamination and has excellent low-temperature bag-making properties. Because the laminated sealant film has excellent low-temperature bag-making properties, it is suitable as a packaging material for many products, such as food, beverages, pharmaceuticals, and chemicals. It is particularly suitable for automatic bag-making into pillow packaging bags, gusset packaging bags, and three-sided seal packaging bags while packaging the contents.
• the laminate sealant film according to the embodiment satisfies all of the following 1) to 7).
• 1) It comprises at least a laminate layer, an intermediate layer, and a seal layer, in that order.
• the laminate layer and the intermediate layer each comprise a polypropylene-based resin composition, and the seal layer comprises a resin composition containing a 1-butene copolymer.
• the ratio of the melt flow rate of the polypropylene resin composition of the intermediate layer to the melt flow rate of the polypropylene resin composition of the laminate layer is 0.6 or more and 2.0 or less.
• the ratio of the melt flow rate of the polypropylene resin composition of the intermediate layer to the melt flow rate of the resin composition containing 1-butene copolymer of the seal layer is 0.6 or more and 3.5 or less.
• the polypropylene-based resin composition of the laminate layer, the polypropylene-based resin composition of the intermediate layer, and the resin composition containing a 1-butene copolymer of the seal layer each have a melt flow rate of 1 g/10 min (load 2.16 kgf) or more and 9 g/10 min (load 2.16 kgf) or less, respectively.
• the melting point of the resin composition containing the 1-butene copolymer in the sealing layer is 50° C. or higher and 140° C. or lower.
• the tensile modulus in the longitudinal direction is 600 MPa or less.
• the laminated sealant film according to the embodiment will be described below.
• the laminated sealant film according to the embodiment includes at least a laminate layer, an intermediate layer, and a seal layer, in this order.
• the laminate layer, intermediate layer, and seal layer will be described in detail below.
• the laminate layer is made of a polypropylene-based resin composition mainly composed of a polypropylene-based resin.
• the term "main component" means that the proportion of the polypropylene-based resin in the polypropylene-based resin composition is 90% by mass or more, more preferably 95% by mass or more, even more preferably 97% by mass or more, and even more preferably 99% by mass or more. The proportion is preferably 100% by mass or less.
• the laminate layer preferably contains 95% by mass or more of the polypropylene-based resin composition, more preferably 97% by mass or more, even more preferably 99% by mass or more, and particularly preferably 100% by mass.
• the laminate layer may contain inevitable impurities other than the polypropylene-based resin composition.
• the polypropylene-based resin in the laminate layer is a resin containing propylene as a main component, and examples thereof include propylene homopolymers, random copolymers and block copolymers of propylene and one or more ⁇ -olefins such as ethylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, octene-1, etc.
• random copolymers and/or block copolymers of propylene and one or more ⁇ -olefins such as ethylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, octene-1 are preferred
• propylene random copolymers which are random copolymers of propylene and one or more ⁇ -olefins are more preferred
• random copolymers of propylene, ethylene, and butene-1 are even more preferred.
• main component means that the proportion of propylene in the polypropylene-based resin is preferably 90% by mass or more, more preferably 95% by mass or more, even more preferably 97% by mass or more, and even more preferably 99% by mass or more. The proportion is preferably 100% by mass or less.
• the polypropylene resin composition of the laminate layer preferably has a melt flow rate (load 2.16 kgf) of 1 g/10 min or more and 9 g/10 min or less, more preferably 1.5 g/10 min or more and 8 g/10 min or less, and even more preferably 2 g/10 min or more and 7 g/10 min or less.
• the melt flow rate can be measured in accordance with JIS K7210.
• the upper limit of the melting point (JIS K7121) of the polypropylene resin composition of the laminate layer is preferably 160°C or less, more preferably 150°C or less, and even more preferably 140°C or less. If the melting point (JIS K7121) of the polypropylene resin composition of the laminate layer is 160°C or less, the tensile modulus of the laminate sealant film is easily set to 600 MPa or less, and the bag-breaking strength is also improved.
• the lower limit of the melting point (JIS K7121) of the polypropylene resin composition of the laminate layer is preferably 120°C or more, more preferably 125°C or more, and even more preferably 130°C or more.
• the laminate sealant film is less likely to wrinkle when, for example, retorted, and transparency is easily maintained.
• the laminate sealant film is less likely to wrinkle when, for example, retorted, and transparency is easily maintained.
• the laminate sealant film is less likely to wrinkle when, for example, retorted, and transparency is easily maintained.
• the polypropylene resin composition of the laminate layer may contain, in addition to the polypropylene resin, 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, it may contain a random or block copolymer in which ethylene is the main component and other monomers such as propylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, and octene-1 are copolymerized with vinyl acetate, (meth)acrylic acid, and (meth)acrylic acid esters, or a mixture thereof.
• These may be crystalline, low-crystalline, or non-crystalline.
• the content of these polymers other than the polypropylene resin in the laminate layer is preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less, and particularly preferably 5% by mass or less.
• the proportion may be 0.1% by mass or more.
• the polyethylene resin of the laminate layer preferably has a melt flow rate (load 2.16 kgf) of 0.1 g/10 min or more and 9 g/10 min or less, more preferably 0.5 g/10 min or more and 8 g/10 min or less, and even more preferably 1 g/10 min or more and 7 g/10 min or less.
• the melt flow rate can be measured in accordance with JIS K7210.
• the polyethylene resin of the laminate layer preferably has a melting point (JIS K7121) of 100°C or more and 140°C or less, more preferably 105°C or more and 135°C or less, and even more preferably 110°C or more and 130°C or less.
• the melting point of the polyethylene resin may show two or more melting endothermic peaks, but the peak with the highest melting temperature is the main peak.
• the polypropylene resin composition of the laminate layer preferably contains an antiblocking agent.
• the antiblocking agent include particles made of silica such as synthetic silica, inorganic particles such as diatomaceous earth, zeolite, talc and mica, and organic particles such as silicone particles, acrylic particles, nylon particles and polyethylene particles. It is more preferable to contain zeolite and/or polyethylene particles. In particular, it is preferable to contain zeolite and polyethylene particles.
• the average particle size of the particles is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, and even more preferably 4 ⁇ m or more. The average particle size of the particles is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, and even more preferably 10 ⁇ m or less.
• the particle size is the volume average particle size.
• the particle content in the polypropylene resin composition of the laminate layer is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.4% by mass or more. Also, it is preferably 2% by mass or less, more preferably 1.5% by mass or less, and even more preferably 1.0% by mass or less. Also, if the amount of particles added is 2% by mass or less, the number of protrusions on the surface is not too large, and poor appearance and reduced abrasion resistance are less likely to occur.
• the polypropylene resin composition of the laminate layer preferably contains 0.01% by mass or more and 2.0% by mass or less of fatty acid amide as an organic lubricant, more preferably 0.05% by mass or more and 1.5% by mass or less, and particularly preferably 0.1% by mass or more and 1.0% by mass or less.
• fatty acid amide is 0.01% by mass or more, blocking between films is not too strong, and the handling of the film is easily satisfied.
• the fatty acid amide is 2.0% by mass or less, the seal strength is not likely to decrease.
• Examples of fatty acid amide include erucic acid amide, ethylene bis oleic acid amide, and behenic acid amide, and these may be used in combination.
• the ratio of the melt flow rate of the polypropylene resin composition of the intermediate layer to the melt flow rate of the polypropylene resin composition of the laminate layer is 0.6 or more and 2.0 or less, preferably 0.7 or more and 1.6 or less, more preferably 0.8 or more and 1.4 or less, and even more preferably 0.9 or more and 1.2 or less.
• the melt flow rate ratio is within this range, it is less likely to cause appearance defects such as layer misalignment, blemishes, and unevenness.
• the intermediate layer is made of a polypropylene-based resin composition mainly composed of a polypropylene-based resin.
• the term "main component" means that the proportion of the polypropylene-based resin in the polypropylene-based resin composition is 80% by mass or more, more preferably 85% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, and particularly preferably 99% by mass or more. The proportion is preferably 100% by mass or less.
• the intermediate layer preferably contains 95% by mass or more of the polypropylene-based resin composition, more preferably 97% by mass or more, even more preferably 99% by mass or more, and particularly preferably 100% by mass.
• the intermediate layer may contain inevitable impurities other than the polypropylene-based resin composition.
• the polypropylene-based resin in the intermediate layer is a resin containing propylene as a main component, and examples thereof include propylene homopolymers, random copolymers and block copolymers of propylene and one or more ⁇ -olefins such as ethylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, octene-1, etc.
• random copolymers of propylene and one or more ⁇ -olefins such as ethylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, octene-1, etc.
• propylene random copolymers which are random copolymers of propylene and one or more ⁇ -olefins are more preferred, and random copolymers of propylene, ethylene, and butene-1 are even more preferred.
• main component means that the proportion of propylene in the polypropylene-based resin is 90% by mass or more, more preferably 95% by mass or more, even more preferably 97% by mass or more, and even more preferably 99% by mass or more. The proportion is preferably 100% by mass or less.
• the polypropylene resin composition of the intermediate layer preferably has a melt flow rate (load 2.16 kgf) of 1 g/10 min or more and 9 g/10 min or less, more preferably 1.5 g/10 min or more and 8 g/10 min or less, and even more preferably 2 g/10 min or more and 7 g/10 min or less.
• the melt flow rate can be measured in accordance with JIS K7210.
• the upper limit of the melting point (JIS K7121) of the polypropylene resin composition of the intermediate layer is preferably 150°C or less, more preferably 145°C or less, and even more preferably 140°C or less.
• the melting point (JIS K7121) of the polypropylene resin of the intermediate layer is 150°C or less, the tensile modulus of the laminated sealant film is easily made 600 MPa or less, and the bag-breaking strength is also improved.
• the lower limit of the melting point (JIS K7121) of the polypropylene resin composition of the intermediate layer is preferably 120°C or higher, more preferably 125°C or higher, and even more preferably 130°C or higher. If the melting point (JIS K7121) of the polypropylene resin composition of the intermediate layer is 120°C or higher, the laminated sealant film is less likely to wrinkle when, for example, it is retorted, and transparency is also easily maintained. In addition, it can be used in applications that could not be handled by sealant films made of polyethylene resins, such as becoming a mono-material film laminated with OPP film.
• the polypropylene resin composition of the intermediate layer may contain at least one 1-butene copolymer selected from the group consisting of ethylene-1-butene copolymer, 1-butene-ethylene copolymer, propylene-1-butene copolymer, and 1-butene-propylene copolymer.
• These copolymers may be random or block copolymers, or mixtures thereof. They may be crystalline, low crystalline, or non-crystalline.
• the content of these polymers other than polypropylene resins in the intermediate layer is preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less, and particularly preferably 5% by mass or less. The proportion may be 0.1% by mass or more.
• the ethylene-1-butene copolymer, 1-butene-ethylene copolymer, propylene-1-butene copolymer, and 1-butene-propylene copolymer of the intermediate layer preferably have a melt flow rate of 0.1 g/10 min or more and 9 g/10 min or less, more preferably 0.5 g/10 min or more and 8 g/10 min or less, and even more preferably 1 g/10 min or more and 7 g/10 min or less.
• the ethylene-1-butene copolymer, 1-butene-ethylene copolymer, propylene-1-butene copolymer, and 1-butene-propylene copolymer of the intermediate layer preferably have a melting point of 50°C or more and 140°C or less, more preferably 60°C or more and 135°C or less, even more preferably 70°C or more and 130°C or less, and particularly preferably 80°C or more and 120°C or less.
• the melting points of ethylene/1-butene copolymers, 1-butene/ethylene copolymers, propylene/1-butene copolymers, and 1-butene/propylene copolymers may show two or more melting endothermic peaks, but the peak with the highest melting temperature is considered to be the main peak.
• the polypropylene resin composition of the intermediate layer may contain an antiblocking agent.
• the antiblocking agent include particles made of silica such as synthetic silica, inorganic particles such as diatomaceous earth, zeolite, talc, and mica, and organic particles such as silicone particles, acrylic particles, nylon particles, and polyethylene particles. It is more preferable to contain zeolite and/or polyethylene particles. In particular, it is preferable to contain zeolite and polyethylene particles.
• the average particle size of the particles is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, and even more preferably 5 ⁇ m or more.
• the average particle size of the particles is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, and even more preferably 10 ⁇ m or less.
• the particle size is the volume average particle size.
• the particle content in the polypropylene resin composition of the intermediate layer is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.4% by mass or more. It is also preferably 2% by mass or less, more preferably 1.5% by mass or less, and even more preferably 1.0% by mass or less.
• the polypropylene resin composition of the intermediate layer may contain a fatty acid amide, preferably from 0.01% by mass to 2.0% by mass, more preferably from 0.05% by mass to 1.5% by mass, and particularly preferably from 0.1% by mass to 1.0% by mass.
• a fatty acid amide include erucic acid amide, ethylene bis oleic acid amide, and behenic acid amide, and these may be used in combination.
• the ratio of the melt flow rate of the resin composition containing 1-butene copolymer of the sealing layer to the melt flow rate of the polypropylene resin composition of the intermediate layer is 0.6 or more and 3.5 or less, preferably 0.7 or more and 1.8 or less, more preferably 0.8 or more and 1.6 or less, even more preferably 0.9 or more and 1.4 or less, and particularly preferably 0.9 or more and 1.2 or less.
• the melt flow rate ratio is within this range, it is less likely to cause appearance defects such as layer misalignment, blemishes, and unevenness.
• the seal layer is made of a resin composition containing a 1-butene copolymer.
• the content ratio of the 1-butene copolymer to the resin composition containing the 1-butene copolymer of the seal layer is preferably 10% by mass or more, more preferably 15% by mass or more, and more preferably 18% by mass or more.
• the content ratio of the 1-butene copolymer is 10% by mass or more, the hermetic seal start temperature can be lowered.
• the content ratio of the 1-butene copolymer is preferably 40% by mass or more, more preferably 60% by mass or more, and even more preferably 80% by mass or more.
• the content ratio of the 1-butene copolymer to the resin composition of the seal layer is preferably 100% by mass or less, more preferably 80% by mass or less, even more preferably 60% by mass or less, and even more preferably 40% by mass or less.
• the sealing layer preferably contains 95% by mass or more of the resin composition containing the 1-butene copolymer, more preferably 97% by mass or more, even more preferably 99% by mass or more, and particularly preferably 100% by mass.
• the sealing layer may contain inevitable impurities other than the resin composition containing the 1-butene copolymer.
• the 1-butene copolymer in the seal layer is a resin containing 1-butene, and examples thereof include 1-butene homopolymers, random copolymers of 1-butene with one or more ⁇ -olefins such as ethylene, propylene, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, and octene-1, and block copolymers.
• 1-butene homopolymers random copolymers of 1-butene with one or more ⁇ -olefins such as ethylene, propylene, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, and octene-1, and block copolymers.
• random copolymers of 1-butene with one or more ⁇ -olefins such as ethylene, propylene, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, and octene-1 are preferred, and random copolymers of 1-butene and propylene are preferred.
• these copolymers may contain 1-butene, and the content ratio of the 1-butene-derived component in the 1-butene copolymer is more preferably 10% by mass or more, even more preferably 15% by mass or more, even more preferably 20% by mass or more, particularly preferably 30% by mass or more, and most preferably 60% by mass or more.
• the content is preferably 80% by mass or less, more preferably 75% by mass or less, and even more preferably 70% by mass or less.
• 1-Butene copolymers have excellent low-temperature sealing properties compared to polypropylene-based resins and polyethylene-based resins.
• the resin composition containing 1-butene copolymer of the sealing layer preferably has a melt flow rate (load 2.16 kgf) of 1 g/10 min or more and 9 g/10 min or less, more preferably 1.5 g/10 min or more and 8 g/10 min or less, and even more preferably 2 g/10 min or more and 7 g/10 min or less.
• the melt flow rate can be measured in accordance with JIS K7112.
• the resin composition containing 1-butene copolymer of the sealing layer has a melting point of 140°C or less, preferably 120°C or less, more preferably 110°C or less, even more preferably 100°C or less, and particularly preferably 90°C or less.
• the resin composition containing the 1-butene copolymer of the sealing layer has a melting point of 50°C or higher, preferably 55°C or higher, more preferably 60°C or higher, even more preferably 70°C or higher, particularly preferably 80°C or higher, and most preferably 100°C or higher.
• the resin composition containing the 1-butene copolymer preferably has a melting point of 100°C or higher.
• the resin composition containing the 1-butene copolymer of the seal layer preferably contains a polypropylene-based resin in addition to the 1-butene copolymer.
• the polypropylene-based resin is a resin mainly composed of propylene, and examples thereof include propylene homopolymers, random copolymers of propylene and one or more ⁇ -olefins such as ethylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, and octene-1, and block copolymers.
• random copolymers of propylene and one or more ⁇ -olefins such as ethylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, and octene-1 are preferred, and propylene random copolymers, which are random copolymers of propylene and one or more ⁇ -olefins, are more preferred, and random copolymers of propylene, ethylene, and butene-1 are even more preferred.
• main component means that the proportion of propylene in the polypropylene-based resin is 90% by mass or more, more preferably 95% by mass or more, even more preferably 97% by mass or more, and even more preferably 99% by mass or more.
• the proportion is preferably 100% by mass or less.
• polypropylene-based resins have a higher melting point and are more transparent.
• the content of the polypropylene-based resin in the resin composition containing the 1-butene copolymer of the seal layer is preferably 90% by mass or less, more preferably 85% by mass or less, even more preferably 82% by mass or less, even more preferably 70% by mass or less, particularly preferably 50% by mass or less, and most preferably 30% by mass or less.
• the polypropylene resin of the sealing layer preferably has a melt flow rate (load 2.16 kgf) of 1 g/10 min or more and 9 g/10 min or less, more preferably 1.5 g/10 min or more and 8 g/10 min or less, and even more preferably 2 g/10 min or more and 7 g/10 min or less.
• the melt flow rate can be measured in accordance with JIS K7210.
• the polypropylene resin of the sealing layer preferably has a melting point of 140°C or less, more preferably 135°C or less. When the polypropylene resin of the sealing layer has a melting point of 140°C or less, the low-temperature sealing property (effect) is excellent.
• the polypropylene resin of the sealing layer preferably has a melting point of 100°C or more, more preferably 110°C or more, even more preferably 120°C or more, and particularly preferably 125°C or more.
• the heat resistance such as boiling resistance and the self-supporting property are excellent.
• the resin composition containing the 1-butene copolymer of the sealing layer preferably contains an antiblocking agent.
• the antiblocking agent include particles made of silica such as synthetic silica, inorganic particles such as diatomaceous earth, zeolite, talc and mica, and organic particles such as silicone particles, acrylic particles, nylon particles and polyethylene particles. It is more preferable to contain zeolite and/or polyethylene particles. In particular, it is preferable to contain zeolite and polyethylene particles.
• the average particle size of the particles is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, and even more preferably 4 ⁇ m or more.
• the average particle size of the particles is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, and even more preferably 10 ⁇ m or less.
• the particle size is the volume average particle size.
• the particle content in the resin composition containing 1-butene copolymer of the sealing layer is preferably 0.1 mass% or more, more preferably 0.3 mass% or more, and even more preferably 0.4 mass% or more. Also, it is preferably 2 mass% or less, more preferably 1.5 mass% or less, and even more preferably 1.0 mass% or less. If the amount of particles added is less than 0.1 mass%, it becomes difficult to achieve a surface roughness Ra of 0.1 ⁇ m or more on at least one surface layer, making it difficult to obtain anti-blocking properties and slip properties. Also, by adding particles in an amount of 2 mass% or less, surface protrusions can be reduced, making it easier to prevent the occurrence of abrasion resistance.
• the resin composition containing the 1-butene copolymer of the seal layer preferably contains 0.01% by mass or more and 2.0% by mass or less of fatty acid amide as an organic lubricant, more preferably 0.05% by mass or more and 1.5% by mass or less, and particularly preferably 0.1% by mass or more and 1.0% by mass or less.
• fatty acid amide is 0.01% by mass or more, blocking between films is less, and the handling properties of the film are easily satisfied.
• the fatty acid amide is 2.0% by mass or less, the seal strength is less likely to decrease.
• fatty acid amide examples include erucic acid amide, ethylene bis oleic acid amide, and behenic acid amide, and these may be used in combination.
• erucic acid amide has a low melting point, is easy to bleed, and is easy to impart lubricity.
• the seal layer contains zeolite as an antiblocking agent and erucic acid amide as an organic lubricant in combination.
• the seal layer contains polyethylene particles as an antiblocking agent and erucic acid amide as an organic lubricant in combination. More preferably, the sealing layer contains a combination of zeolite and polyethylene particles as an antiblocking agent and erucamide as an organic lubricant.
• laminate layer/intermediate layer/seal layer indicates a structure in which a laminate layer, an intermediate layer, and a seal layer are laminated in order. It is preferable that an intermediate layer is disposed between the laminate layer and the seal layer, since peeling between the laminate layer and the seal layer is unlikely to occur and recycled raw materials can be easily used.
• the raw material composition of the intermediate layer is preferably a raw material composition that is intermediate between the laminate layer and the seal layer, so that peeling between the laminate layer and the seal layer is unlikely to occur.
• the thickness of the laminate layer is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more.
• the thickness of the seal layer is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more.
• the thickness of the intermediate layer is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, even more preferably 10 ⁇ m or more, and particularly preferably 15 ⁇ m or more.
• the thickness of the laminate layer is preferably 12 ⁇ m or less, more preferably 10 ⁇ m or less, and even more preferably 8 ⁇ m or less.
• the thickness of the seal layer is preferably 12 ⁇ m or less, more preferably 10 ⁇ m or less, and even more preferably 8 ⁇ m or less.
• the thickness of the intermediate layer is preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, and even more preferably 20 ⁇ m or less.
• the ratio of the thickness of the intermediate layer to the thickness of the laminate layer is preferably 1.0 or more, more preferably 1.5 or more, and even more preferably 2.0 or more.
• the ratio of the thickness of the seal layer to the thickness of the laminate layer is preferably 0.3 or more and 1.5 or less, and preferably 0.5 or more and 1.2 or less.
• the ratio of the thickness of the intermediate layer to the thickness of the seal layer is preferably 1.0 or more, more preferably 1.5 or more, and even more preferably 2.0 or more.
• the ratio of the melt flow rates of the raw resins of adjacent layers is preferably 0.6 or more and 2.0 or less. When the melt flow rate ratio is in this range, it is difficult to cause poor appearance such as layer misalignment, smearing, and unevenness.
• the melting point of the laminated sealant film is preferably 120°C or more, more preferably 130°C or more, and even more preferably 140°C or more. When the main peak of the melting point of the film is 120°C or more, the boil resistance and retort resistance are further improved.
• the main peak of the melting point of the laminated sealant film is preferably 160°C or less, and more preferably 150°C or less.
• the method for producing the laminated sealant film will be described in detail below, but is not limited thereto.
• the resin composition of the laminate layer, intermediate layer, and seal layer is blended with the above-mentioned resin raw material and various additives as necessary using a mixer such as a Henschel mixer, a Banbury mixer, or a tumbler mixer to produce the film.
• a mixer such as a Henschel mixer, a Banbury mixer, or a tumbler mixer to produce the film.
• the obtained resin composition can be used to form a multi-layer film.
• the mixed resin composition is melted under conditions of, for example, a resin temperature of 110° C. or more and 300° C. or less, and is melt-extruded, for example, from a T-shaped die into a sheet, cast onto a cooling roll, and cooled and solidified to obtain an unstretched sheet.
• a resin temperature of 110° C. or more and 300° C. or less
• a multi-layering device such as a multi-layer feed block, a static mixer, or a multi-manifold die can be used.
• a method in which resins sent out from different flow paths using two or more extruders are laminated into multiple layers using a multi-layer feed block or a multi-manifold die can be mentioned.
• a method in which a melt-kneaded laminated resin composition sheet is melt-extruded and made into a film using a T-die method or an inflation method can be mentioned, but the T-die method is particularly preferable in that the melting temperature of the resin can be increased.
• the lower limit of the cooling roll temperature is preferably 10°C. If it is less than the above, not only may the effect of suppressing crystallization become saturated, but also problems such as condensation may occur, which is not preferable.
• the upper limit of the cooling roll temperature is preferably 70°C or less. If it exceeds the above, crystallization progresses and transparency deteriorates, which is not preferable.
• the temperature of the cooling roll is set to the above range, it is preferable to lower the humidity of the environment near the cooling roll to prevent condensation.
• the surface of the cooling roll is in contact with a high-temperature resin, so the temperature of the cooling roll surface rises.
• the cooling roll is cooled by flowing cooling water through a pipe inside, but it is necessary to reduce the temperature difference in the width direction of the cooling roll surface by ensuring a sufficient amount of cooling water, devising the arrangement of the pipes, and performing maintenance so that sludge does not adhere to the pipes.
• the thickness of the unstretched sheet is preferably in the range of 3 ⁇ m or more and 200 ⁇ m or less.
• the thickness of the film is preferably in the range of 5 ⁇ m or more and 100 ⁇ m or less, and more preferably in the range of 10 ⁇ m or more and 80 ⁇ m or less.
• the resulting unstretched sheet may be stretched, but since stretching to 2.0 times or more will result in a tensile modulus of elasticity exceeding 600 MPa, a stretching ratio of less than 2.0 times is preferred.
• the "longitudinal direction” is the direction corresponding to the flow direction in the film manufacturing process
• the "width direction” is the direction perpendicular to the flow direction in the film manufacturing process.
• the “longitudinal direction” may be abbreviated to the "MD direction” and the “width direction” to the "TD direction”.
• the upper limit of the tensile modulus in the longitudinal direction of the laminated sealant film is preferably 600 MPa or less, more preferably 580 MPa or less, even more preferably 560 MPa or less, even more preferably 540 MPa or less, particularly preferably 520 MPa or less, and most preferably 500 MPa or less.
• the lower limit of the tensile modulus in the longitudinal direction of the laminated sealant film is preferably 200 MPa or more, more preferably 250 MPa or more, even more preferably 300 MPa or more, and even more preferably 325 MPa or more.
• the upper limit of the tensile modulus in the width direction of the laminated sealant film is preferably 580 MPa or less, more preferably 530 MPa or less, even more preferably 500 MPa or less, even more preferably 480 MPa or less, and especially preferably 440 MPa or less.
• the tensile modulus in the width direction is 580 MPa or less, the low-temperature sealing effect of the sealing start temperature is improved.
• the lower limit of the tensile modulus in the width direction of the laminated sealant film is preferably 200 MPa or more, more preferably 250 MPa or more, even more preferably 300 MPa or more, and even more preferably 325 MPa or more.
• the tensile modulus in the width direction is 200 MPa or more, bag making processing is easier to perform.
• the upper limit of the sum of the longitudinal tensile modulus and the width tensile modulus of the laminated sealant film is preferably 1180 MPa or less, more preferably 1130 MPa or less, even more preferably 1080 MPa or less, even more preferably 1030 MPa or less, particularly preferably 980 MPa or less, and most preferably 930 MPa or less. If the longitudinal tensile modulus is 1180 MPa or less, the low-temperature sealing effect at the sealing start temperature is improved.
• the lower limit of the sum of the longitudinal tensile modulus and the width tensile modulus of the laminated sealant film is preferably 400 MPa or more, more preferably 500 MPa or more, even more preferably 600 MPa or more, and even more preferably 650 MPa or more. If the longitudinal tensile modulus is 400 MPa or more, bag making processing is easier to perform.
• the upper limit of the average of the longitudinal tensile modulus and the width tensile modulus of the laminated sealant film is preferably 600 MPa or less, more preferably 580 MPa or less, even more preferably 560 MPa or less, even more preferably 540 MPa or less, and particularly preferably 520 MPa or less.
• the lower limit of the average of the longitudinal tensile modulus and the width tensile modulus of the laminated sealant film is preferably 200 MPa or more, more preferably 250 MPa or more, even more preferably 300 MPa or more, and even more preferably 325 MPa or more.
• the longitudinal tensile modulus is 200 MPa or more, bag making processing is easier to perform.
• the haze of the laminated sealant film is preferably 10% or less, more preferably 9% or less, even more preferably 8% or less, even more preferably 7% or less, and particularly preferably 5% or less. If the haze exceeds 10%, the film often has streaks or scratches, and the contents are difficult to see.
• the haze of the laminated sealant film 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 friction coefficient is unlikely to increase.
• the delamination of the laminated sealant film means, for example, the case where delamination occurs between the seal layer and the intermediate layer when the flat seal initiation temperature, the hermetic seal initiation temperature, or the burst strength is measured. If this delamination occurs, it becomes difficult to remove the contents, so it is preferable that delamination does not occur. Delamination is likely to occur when the components or component ratios of the resin compositions of the seal layer and the intermediate layer and/or the intermediate layer and the laminate layer are significantly different.
• the flat seal start temperature of the laminated sealant film is preferably 50°C or higher and 150°C or lower, more preferably 70°C or higher and 140°C or lower, even more preferably 100°C or higher and 130°C or lower, and even more preferably 105°C or higher and 121°C or lower.
• the flat seal start temperature is preferably set at a lower limit of a temperature 30°C or higher than the melting point of the polypropylene resin of the seal layer and at an upper limit of a temperature 10°C or higher than the melting point of the polypropylene resin of the laminate layer.
• the low-temperature seal effect of the flat seal start temperature is evaluated based on the degree of reduction in heat seal temperature, based on the heat seal temperature in Comparative Example 3 described later.
• the low-temperature seal effect of the flat seal start temperature is preferably 30°C or higher, more preferably 40°C or higher, even more preferably 50°C or higher, even more preferably 60°C or higher, and particularly preferably 70°C or higher.
• the sealing start temperature of the laminated sealant film is preferably 100°C or more and less than 140°C, more preferably 110°C or more and 135°C or less, and even more preferably 120°C or more and 130°C or less.
• the sealing start temperature is preferably set at a lower limit of a temperature 30°C or more lower than the lowest melting point of the polypropylene resin of the seal layer and at an upper limit of a temperature 10°C or more higher than the highest melting point of the polypropylene resin of the laminate layer.
• the low-temperature sealing effect of the sealing start temperature is evaluated based on the sealing temperature in Comparative Example 3 described later, based on the degree of reduction in the sealing temperature.
• the low-temperature sealability of the sealing start temperature is preferably more than 10°C, more preferably 15°C or more, even more preferably 20°C or more, particularly preferably 25°C or more, and most preferably 30°C or more.
• the hot tack property of the laminated sealant film is preferably such that the peeling distance of the tack is 20 mm or less at a lower temperature.
• the hot tack property is said to be good when the sealant film has sufficient sealing strength even when the resin of the sealant film is in a molten state.
• the low-temperature sealing effect of the hot tack property is evaluated based on the degree of reduction in the heat sealing temperature, based on the hot tack temperature in Comparative Example 3 described later.
• the low-temperature sealing effect of the hot tack property is preferably 30° C. or higher, more preferably 40° C. or higher, even more preferably 50° C. or higher, even more preferably 60° C. or higher, and particularly preferably 70° C. or higher.
• the flat seal initiation temperature and hermetic seal initiation temperature can be reduced, allowing low-temperature sealing properties to be achieved.
• a polypropylene-based resin in the laminate layer, intermediate layer, and sealing layer, it becomes easier to maintain the heat resistance of the laminated sealant film, and delamination between layers can be reduced.
• the impact strength of the laminated sealant film is less likely to decrease even at a low temperature of 5° C. or less than the impact strength at room temperature.
• the higher the mixing ratio of the 1-butene copolymer in the seal layer the less likely the impact strength at low temperatures is to decrease.
• the cold resistance improvement of the impact strength of the laminated sealant film is evaluated based on the difference from the impact strength at 0° C. in Comparative Example 3 described later.
• the cold resistance improvement of the impact strength is preferably 0.05 J or more, more preferably 0.10 J or more, even more preferably 0.15 J or more, even more preferably 0.20 J or more, and particularly preferably 0.25 J or more.
• the burst strength of the laminated sealant film is evaluated by a bag made from the laminated sealant film.
• a strong burst strength is required for retort sterilization, it is preferably 20 kPa or more, more preferably 25 kPa or more.
• the burst strength of the laminated sealant film may be 35 kPa or less, or may be 30 kPa or less. It has been confirmed that the laminated sealant film achieves a low-temperature sealing effect of at least the flat seal start temperature and the hermetic seal start temperature by optimizing the melting point of the seal layer and the elastic modulus of the film, and also improves its burst strength. This is thought to be because the bag becomes easier to deform by optimizing the elastic modulus in particular, and the burst strength is improved.
• the static and dynamic friction coefficients of the laminated sealant film between the surfaces of the seal layers at a load of 0.5 kgf are preferably 2.0 or less, more preferably 1.0 or less, and even more preferably 0.5 or less.
• a static and/or dynamic friction coefficient of 2.0 or less the slipperiness between the films is sufficient, and the handling property as a packaging material is improved.
• the melting point of the resin was measured using a differential scanning calorimeter (Seiko Instruments Inc., DSC60) in accordance with JIS K7121. Specifically, about 5 mg of the sample was packed in an aluminum pan, heated from room temperature to 200° C. at a heating/cooling rate of 10° C./min, held at 200° C. for 3 minutes, cooled to 23° C., held at 23° C. for 3 minutes, and then heated again to 200° C. The maximum melting endothermic peak temperature was taken as the melting point. When there were two or more melting endothermic peaks, the highest melting endothermic peak was taken as the melting point.
• the melting point of the laminated sealant film was measured using a differential scanning calorimeter (Seiko Instruments Inc., DSC60) in accordance with JIS K7121. Specifically, about 5 mg of the laminated sealant film was packed in an aluminum pan, heated from room temperature to 200°C at a heating/cooling rate of 10°C/min, held at 200°C for 3 minutes, cooled to 23°C, held at 23°C for 3 minutes, and then heated again to 200°C. The maximum melting endothermic peak temperature was taken as the melting point. When there were two or more melting endothermic peaks, the highest melting endothermic peak was taken as the melting point.
• Inorganic particles or polyethylene particles were dispersed in ion-exchanged water stirred at a predetermined rotation speed (about 5000 rpm) using a high-speed stirrer, and the dispersion was added to isotone (physiological saline) and further dispersed using an ultrasonic disperser, after which the particle size distribution was obtained by the Coulter counter method and calculated as the volume average particle size.
• the refractive index was 1.30 for physiological saline, 1.457 for silicates such as synthetic silica and zeolite, and 1.54 for polyethylene.
• the heat-sealed sample was cut into strips so that the heat seal width was 15 mm, and set in a universal material testing machine (Instron Japan Co., Ltd., 68TM-5 type), and the maximum strength at which the seal layers were peeled off at a speed of 200 mm / min was measured with n number 3, and the heat seal strength and heat seal temperature at each temperature were plotted.
• the heat seal temperature at which 4.9 N / 15 mm was obtained was read from a graph connecting each plot with a straight line, and this was taken as the flat seal start temperature.
• a dry lamination adhesive (TM569, CAT-10L, manufactured by Toyo-Morton Co., Ltd.) was applied to the corona surface of the biaxially oriented polypropylene film so as to have a solid content of 3 g/ m2 , and after the solvent was volatilized and removed in an oven at 80°C, the corona surface of the laminated sealant film and the adhesive-coated surface were nipped and laminated with a temperature-controlled roll at 60°C. This laminated laminate was left to stand at 40°C for 2 days.
• TM569, CAT-10L manufactured by Toyo-Morton Co., Ltd.
• the laminated laminate was made into a bag using a horizontal pillow packaging machine (FW3301 II/B BD100, manufactured by Fujikikai Co., Ltd.). The conditions were set to a cut length of 250 mm, height of 45 mm, and rotation speed of 40 rpm, and a sponge scrubber (Kikulon Co., Ltd., Kikulon A (size: 75 x 115 x 36 mm)) was used as the content.
• the bag was made at the same temperature for the center seal part and the end seal part, and the temperature was lowered from 170 ° C. in 5 ° C. intervals. For the evaluation, first, one bag was cut into two so that two complete end seal parts were obtained.
• evaluation liquid self-recording ink RED1812E, manufactured by Kobayashi Create Co., Ltd.
• the lowest heat seal temperature at which the evaluation liquid did not penetrate was determined as the hermetic seal initiation temperature.
• a horizontal pillow packaging machine for packaging food products, etc. is equipped with a center sealer and an end sealer.
• the end sealer located on the downstream side, seals and cuts the end seal parts, located upstream and downstream of the packaged product, of the tubular film wrapped around the packaged product transported from the center sealer in the flow direction.
• the center sealer is equipped with a pair of transport rollers and a pair of heating rollers.
• the tubular film is transported by sandwiching the central seal part, which joins both ends in the downstream width direction.
• the pair of heating rollers located on the downstream side, sandwich and heat the central seal part of the transported tubular film.
• the center seal part of the tubular film is heated and pressurized by the pair of heating rollers, and is thermally compressed.
• the time for heating and pressurizing by the pair of heating rollers in the center seal part is significantly shorter than the heating and pressurizing time of the end sealer, which seals the end seal part using a box motion mechanism, etc.
• the bag making speed is about five times faster in Example 1 than in Comparative Example 3.
• the heating temperature of the pair of heating rollers is set high to increase the sealing strength of the center seal, there is a sufficient difference in melting point with the base film, so there is no slight melting of the film surface due to heating, the molten film does not adhere to the surface of the heating roller, and the frequency of cleaning of the heating roller is reduced.
• the laminated sealant films were placed with the sealant surfaces facing each other, and heat sealed for 1 second at 60 to 170°C with 5°C intervals and a pressure of 2 kgf/ cm2 , and then a load of 46 g was applied to measure the distance the seal peeled off.
• the device used was a HEAT SEAL TESTER, TP-701-B, manufactured by Tester Sangyo Co., Ltd.
• the temperature at which the seal peeled off distance was 20 mm or less was defined as the hot tack temperature.
• Tensile Modulus Measurements were performed under the following conditions in accordance with JIS K7127. First, the tensile modulus of the laminate in the machine direction (MD) and the direction perpendicular to the film machine direction (TD) was measured three times with a sample length of 100 mm, a sample width of 15 mm, a chuck distance of 20 mm, and a speed of 200 mm/min, and the average value was taken as the tensile modulus in each direction.
• the appearance unevenness of the laminated sealant film was evaluated by visually checking the presence or absence of appearance defects called layer misalignment, spots, and unevenness, which are not uniform in appearance of the film.
• the laminated sealant film was measured in accordance with JIS K7105 using a turbidity meter (manufactured by Nippon Denshoku Industries Co., Ltd., model: ZE2000).
• CP/CP The opposing seal layer surface and seal layer surface of the laminated sealant film in the laminated laminated sealant film, i.e., the seal layer surfaces.
• OP/CP The laminate layer surface of the laminated sealant film and the surface of the biaxially oriented polypropylene film.
• Polyethylene resin The following resins were used as the polyethylene resins. 1) FV405 (manufactured by Sumitomo Chemical Co., Ltd., Sumikathene (registered trademark) E, linear low-density polyethylene resin, melting point 118°C, melt flow rate 3.8g/10min, flexural modulus 220MPa)
• the following particles were used as the antiblocking agent. 1) Synthetic silica: KMP130-2 (silica, average particle size 2 ⁇ m, manufactured by Shin-Etsu Chemical Co., Ltd.) 2) Synthetic silica: KMP130-4 (silica, average particle size 4 ⁇ m, manufactured by Shin-Etsu Chemical Co., Ltd.) 3) Ultra-high molecular weight polyethylene particles: PM200 (average particle size 10 ⁇ m, manufactured by Mitsui Chemicals, Inc.)
• Organic Lubricant The following compounds were used as organic lubricants: 1) Erucic acid amide: Brand name Diamid L-200 (melting point 81°C, manufactured by Mitsubishi Chemical Corporation) 2) Behenic acid amide: Brand name D1007 (melting point 110°C, manufactured by Tokyo Chemical Industry Co., Ltd.)
• Behenic acid amide master batch (M5): Behenic acid amide was mixed with Noblen (registered trademark) FL6745A manufactured by Sumitomo Chemical Co., Ltd. to prepare a master batch containing 2% by mass of behenic acid amide.
• Example 1 The laminate layer was made of WF836DG3, the intermediate layer was made of FL6745A, and the seal layer was made of BL2481M.
• the seal layer was made of the resin and additives shown in Table 1 as the raw materials, and the mixing ratio of each raw material was adjusted to the composition ratio shown in Table 1.
• the master batch was made using BL2481M instead of FL6745A.
• the mixture was melted at 240°C by each of the three extruders, filtered with a sintered filter with a filtration accuracy of 60 ⁇ m, and then co-extruded into a sheet from a T-die.
• the thickness ratio of the laminate layer, intermediate layer, and seal layer was melt-extruded to be 20:60:20% by volume, cooled and solidified with a cooling roll at 30°C, and then wound into a roll at a speed of 20 m/min to obtain a laminate sealant film with a thickness of 30 ⁇ m and a wet tension of the laminate layer of 45 mN/m.
• a dry lamination adhesive (TM569, CAT-10L, Toyo-Morton Co., Ltd.) was applied to the corona surface of a biaxially oriented polypropylene film (Pylen (registered trademark), P2161, 20 ⁇ m, manufactured by Toyobo Co., Ltd.) so as to have a solid content of 3 g/ m2 , and the solvent was removed by volatilization in an oven at 80 ° C., and then the corona surface of the obtained laminated sealant film and the adhesive-coated surface were nipped and laminated on a temperature-controlled roll at 60 ° C. Before the lamination, a corona treatment was applied to the surface of the laminate layer side of the laminated sealant film. This laminated laminated sealant film was left to stand at 40 ° C. for 2 days. The evaluation results are shown in Table 2.
• Example 2 The laminate layer, intermediate layer, and seal layer were prepared by obtaining a laminate sealant film in the same manner as in Example 1, except that a master batch was appropriately used to make the resins and additives shown in Table 1 as raw materials, and then laminating the laminate sealant film.
• a master batch was prepared using the 1-butene copolymer used in the seal layer instead of FL6745A. The evaluation results are shown in Table 2.
• the laminated sealant films of Examples 1 to 14 did not experience delamination, and furthermore, were able to reduce the flat seal initiation temperature and hermetic seal initiation temperature, demonstrating good low-temperature bag-making properties.
• the laminated sealant film was prepared by obtaining a laminated sealant film in the same manner as in Example 1, except that the laminate layer, intermediate layer, and seal layer were made of the resins and additives shown in Table 3 as raw materials and appropriately using a master batch.
• the evaluation results are shown in Table 4.
• the master batch used in the reference example was Sumikathene (registered trademark) FV405 manufactured by Sumitomo Chemical Co., Ltd., which was added with silica, ultra-high molecular weight polyethylene particles, erucic acid amide, or behenic acid amide.
• the laminated sealant film obtained in Comparative Example 1 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 2 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 3 has a high flat seal temperature and a high hermetic seal temperature.
• the laminated sealant film obtained in Comparative Example 4 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 5 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 6 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 7 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 8 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 9 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 10 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 11 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 12 had a high elastic modulus and was poor in low-temperature sealing effect at the hermetic sealing temperature.
• the laminated sealant film obtained in Comparative Example 13 had a high elastic modulus and was poor in low-temperature sealing effect at the sealing temperature.
• the melt flow rate ratio between the laminate layer and the intermediate layer was large, and therefore, the appearance was uneven.
• the laminated sealant film obtained in Comparative Example 14 had a large melt flow rate ratio between the laminate layer and the intermediate layer, and was inferior in low-temperature sealing effect at the sealing temperature. Furthermore, unevenness in appearance was observed.
• the sealing layer was made of a polyethylene resin, and delamination was observed.
• the laminated sealant film obtained in Reference Example 1 was a polyethylene-based laminated sealant film rather than a polypropylene-based film, and had a low elastic modulus and was not suitable for high-speed automatic bag production.
• laminated sealant film Since laminated sealant film has excellent low-temperature bag-making properties, it is suitable as a packaging material for many products such as food, beverages, pharmaceuticals, and chemicals. It is particularly suitable for use in automatically processing pillow packaging bags, gusset packaging bags, and three-sided seal packaging bags while packaging the contents.

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