Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
  • A47J36/00—Parts, details or accessories of cooking-vessels
  • A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
  • A47J36/04—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay the materials being non-metallic
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
  • A47J36/00—Parts, details or accessories of cooking-vessels
  • A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
• • 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
• • 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
  • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
  • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package

Definitions

• the present invention relates to a heat-resistant container and a cooking method. More specifically, the present invention relates to a heat-resistant container at least a portion of which is made of a container-forming material having a specific heat-sealing layer, and a cooking method for cooking ingredients using the heat-resistant container.
• Patent Document 1 describes a pouch that uses a laminate having a heat seal layer, and has a storage section provided inside by bonding the peripheral parts of the heat seal layers facing each other. This pouch allows food such as meat to be placed in the storage section and cooked in a microwave oven or by boiling. This makes it possible to cook while reducing the effort of washing cooking utensils such as pots and cleaning the kitchen.
• Patent Document 1 The pouch described in Patent Document 1 is useful when used for cooking in a microwave oven or boiling.
• the pouch when the pouch is placed on a pot or frying pan on a gas stove and stir-fried or deep-fried food is cooked in the pouch, the pouch cannot be used because the pouch cannot be used due to the lack of heat resistance of the pouch's constituent material, which may cause problems such as melting and opening holes in the pouch.
• a heat-resistant container that can be placed on a cooking utensil such as a pot or frying pan that is directly heated, and can be used to cook stir-fried foods, deep-fried foods, etc.
• such a heat-resistant container that can be manufactured by a simple means such as heat sealing.
• the problem that the present invention aims to solve is to provide a heat-resistant container that has heat resistance that allows cooking to be performed by placing it on a cooking utensil such as a pot or frying pan that is directly placed on a fire, and that can be manufactured by a simple means such as heat sealing.
• the problem that the present invention aims to solve is to provide a cooking method that can be used to cook stir-fried or deep-fried foods by placing it on a cooking utensil such as a pot or frying pan that is directly heated, thereby reducing the effort required to wash the cooking utensil and clean the kitchen.
• a heat-resistant container at least a portion of which is made of a container-forming material having a heat seal layer,
• the heat seal layer contains a resin composition for forming a heat seal layer,
• the resin composition for forming a heat seal layer contains a crystalline polyethylene terephthalate resin and a styrene-(meth)acrylic acid ester resin having an epoxy group, and the content of the styrene-(meth)acrylic acid ester resin having an epoxy group is 0.1 parts by mass or more and 0.9 parts by mass or less relative to 100 parts by mass of the crystalline polyethylene terephthalate resin;
• the heat-resistant container is 0.1 parts by mass or more and 0.9 parts by mass or less relative to 100 parts by mass of the crystalline polyethylene terephthalate resin
• the resin composition for forming a heat seal layer contains a polybutylene terephthalate-based resin, and the content of the polybutylene terephthalate-based resin relative to 100 parts by mass of the crystalline polyethylene terephthalate-based resin is less than 30 parts by mass.
• Item 2. The heat-resistant container according to item 1.
• the crystalline polyethylene terephthalate resin is The crystal melting peak temperature is 220° C. or more and 270° C. or less, and/or The intrinsic viscosity at 25°C is 0.65 dl/g or more and 0.9 dl/g or less.
• the heat-resistant container according to item 1 or 2 wherein the container-forming material is a laminate having the heat seal layer and a base material layer, and the base material layer has one or more layers selected from the group consisting of a biaxially oriented polyester resin layer, a paper layer, a metal-vapor-deposited biaxially oriented polyester resin layer, and a metal foil layer.
• a cooking method comprising cooking using the heat-resistant container according to item 4.
• the present invention provides a heat-resistant container that has heat resistance that allows cooking to be carried out by placing it on a cooking utensil such as a pot or frying pan that is directly heated, and that can be manufactured by a simple means such as heat sealing.
• the present invention provides a cooking method that allows cooking of stir-fried or deep-fried foods by placing the cookware on a cooking utensil such as a pot or frying pan that is directly heated, thereby reducing the time and effort required for washing the cooking utensils and cleaning the kitchen.
• FIG. 1 is a schematic diagram of a first heat-resistant bag which is one embodiment of a heat-resistant container according to the present invention.
• FIG. 2 is a schematic diagram of a second heat-resistant bag which is one embodiment of the heat-resistant container according to the present invention.
• FIG. 4 is a schematic diagram of a third heat-resistant bag which is one embodiment of the heat-resistant container according to the present invention.
• 1 is a schematic diagram of a heat-resistant plate which is one embodiment of a heat-resistant container according to the present invention.
• FIG. 2 is a schematic diagram of a cooking method using a first heat-resistant bag, which is one embodiment of the cooking method according to the present invention.
• the heat-resistant container of the present invention is a heat-resistant container at least a part of which is constituted of a container-forming material having a specific heat-seal layer, the specific heat-seal layer containing a specific resin composition for forming a heat-seal layer, the resin composition for forming a heat-seal layer containing a crystalline polyethylene terephthalate-based resin and a styrene-(meth)acrylic acid ester-based resin having an epoxy group, and the content of the styrene-(meth)acrylic acid ester-based resin having an epoxy group relative to 100 parts by mass of the crystalline polyethylene terephthalate-based resin is 0.1 parts by mass or more and 0.9 parts by mass or less.
• the heat seal layer in the container-forming material constituting at least a part of the heat-resistant container of the present invention contains a specific resin composition for forming a heat seal layer.
• the resin composition for forming a heat seal layer contains a crystalline polyethylene terephthalate resin and a styrene-(meth)acrylic acid ester resin having an epoxy group, and the content of the styrene-(meth)acrylic acid ester resin having an epoxy group is 0.1 parts by mass or more and 0.9 parts by mass or less relative to 100 parts by mass of the crystalline polyethylene terephthalate resin.
• the resin composition for forming a heat seal layer may further contain less than 30 parts by mass of a polybutylene terephthalate resin relative to 100 parts by mass of the crystalline polyethylene terephthalate resin.
• the resin composition for forming a heat seal layer has a crystallinity ⁇ c of, for example, 6.0% or more, for example, 11.5% or less, and preferably 9.5% or less.
• the resin composition for forming a heat seal layer is prepared by providing a heat seal layer containing the resin composition for forming a heat seal layer between adherends, or by overlapping heat seal layers containing the resin composition for forming a heat seal layer, and heating the heat seal layer to a temperature equal to or higher than the crystallization temperature of the crystalline polyethylene terephthalate resin (near 130°C), increasing the entanglement of the layers due to thermal molecular motion of the amorphous parts, and then cooling and solidifying the layers to form a heat seal having heat seal strength sufficient to seal the contents.
• a heat seal having a peel strength measured at a tensile speed of 300 mm/min according to JIS Z 1707 of 3 N or more per 15 mm heat seal width at a heat seal temperature of 170° C., and 3 N or more per 15 mm heat seal width at a heat seal temperature of 140° C.
• the heating method is not particularly limited, but can be performed using, for example, a heat sealing device using a heated plate, impulse, high frequency, ultrasonic, or the like.
• the crystalline polyethylene terephthalate resin contained in the resin composition for forming the heat seal layer is obtained by reacting a polyvalent carboxylic acid component containing a terephthalic acid component with a polyhydric alcohol component containing an ethylene glycol component, and is not particularly limited as long as it has ethylene terephthalate units and is crystalline.
• the crystalline polyethylene terephthalate resin of the present invention has 60% by mass or more, preferably 80% by mass or more, and more preferably 85% by mass or more of ethylene terephthalate units, with the total constituent units being 100% by mass.
• the upper limit of the ethylene terephthalate units is 100% by mass (homopolymer).
• the crystalline polyethylene terephthalate resin may be a homopolymer or a copolymer.
• the copolymer is formed by replacing a part of the polyvalent carboxylic acid component and/or the polyhydric alcohol component with a copolymer component and reacting the copolymer.
• examples of the polyvalent carboxylic acid copolymerization components that can be contained in the polyvalent carboxylic acid component include aromatic polyvalent carboxylic acids such as isophthalic acid, phthalic acid, methyl terephthalic acid, methyl isophthalic acid, naphthalenedicarboxylic acid (2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, etc.), 4,4'-diphenyldicarboxylic acid, 3,4'-diphenyldicarboxylic acid, 4,4'-diphenoxyethanedicarboxylic acid, diphenyl ether dicarboxylic acid, diphenylmethane dicarboxylic acid, diphenylethane dicarboxylic acid, and diphenyl ketone dicarboxylic acid;
• examples of the polycarboxylic acid include alicyclic polycarboxylic acids such as isophthalic acid,
• the polycarboxylic acid is isophthalic acid, sebacic acid, adipic acid, and reactive derivatives thereof (alkyl esters having 1 to 6 carbon atoms, acid halides, and acid anhydrides).
• the amount of these polybasic carboxylic acid copolymer components used is 30 mol % or less, preferably 25 mol % or less, and more preferably 20 mol % or less, of the total polybasic carboxylic acid components.
• examples of the polyhydric alcohol copolymerization component that can be contained in the polyhydric alcohol component include at least one selected from the group consisting of aliphatic diols such as trimethylene glycol, propylene glycol, 1,3-butanediol, tetramethylene glycol, neopentyl glycol, hexamethylene glycol, octanediol, and decanediol; polyoxyalkylene glycols such as diethylene glycol, triethylene glycol, polyoxyethylene glycol, ditetramethylene glycol, polytetramethylene ether glycol, dipropylene glycol, tripropylene glycol, polyoxypropylene glycol, and polytetramethylene ether glycol; alicyclic diols such as cyclohexanediol and 1,4-cyclohexanedimethanol; aromatic diols such as hydroquinone, resorc
• it is at least one selected from the group consisting of propylene glycol, 1,4-butanediol, diethylene glycol, and 1,4-cyclohexanedimethanol.
• the amount of these polyhydric alcohol copolymer components used is 30 mol % or less, preferably 25 mol % or less, and more preferably 20 mol % or less, of the total polyhydric alcohol components.
• the copolymerization component one or more selected from the group consisting of hydroxycarboxylic acid components such as 2-hydroxypropanoic acid, 3-hydroxypropanoic acid, hydroxybutanoic acid, ⁇ -oxycaproic acid, hydroxybenzoic acid, hydroxyethoxybenzoic acid, oxynaphthoic acid, diphenyleneoxycarboxylic acid, and reactive derivatives thereof; cyclic ester components such as propiolactone, butyrolactone, valerolactone, and ⁇ -caprolactone; etc. can be used.
• the amount of constituent units from these hydroxycarboxylic acid components or cyclic ester components used can be 20 mol % or less, preferably 10 mol % or less, of the total constituent units of the polyethylene terephthalate resin.
• the number average molecular weight of the polyethylene terephthalate resin is not particularly limited, and is, for example, 0.5 ⁇ 10 4 or more, preferably 1.0 ⁇ 10 4 or more, more preferably 1.2 ⁇ 10 4 or more, and is, for example, 1.0 ⁇ 10 6 or less, preferably 7.0 ⁇ 10 5 or less, more preferably 3.0 ⁇ 10 5 or less.
• the polyethylene terephthalate resin may be a commercially available product or may be one obtained by a known polymerization method.
• recycled resin obtained by crushing or melting and pelletizing used resin from used polyethylene terephthalate bottles (PET bottles) or the like may be used as the polyethylene terephthalate resin.
• the crystalline polyethylene terephthalate resin is a crystalline resin that has a crystalline melting peak temperature in the range of 220°C or higher and 270°C or lower in thermal analysis by a differential scanning calorimeter (DSC), and has a crystalline heat of fusion ( ⁇ H m ) of 10 J/g or more at the crystalline peak temperature when the resin is heated to a crystalline melting peak temperature or higher at a rate of 10°C/min, cooled to room temperature at the same rate, and then heated again at the same rate.
• the crystal melting peak temperature is preferably 220° C. or higher, more preferably 245° C. or higher, and is preferably 270° C. or lower, more preferably 265° C. or lower.
• the crystalline heat of fusion ( ⁇ H m ) is preferably 25 J/g or more, more preferably 50 J/g or more.
• Crystalline polyethylene terephthalate resin has an intrinsic viscosity, measured at 25°C by dissolving in a 1:1 mixed solvent of phenol:tetrachloroethane, of 0.60 dl/g or more, preferably 0.65 dl/g or more, more preferably 0.75 dl/g or more, and 0.90 dl/g or less, preferably 0.85 dl/g or less. If the intrinsic viscosity is less than 0.60 dl/g, the melt viscosity during film formation may be insufficient, resulting in unstable film formation. If the intrinsic viscosity exceeds 0.90 dl/g, heat sealability may be difficult to achieve.
• the method for producing the crystalline polyethylene terephthalate resin is not particularly limited.
• the method may be the following (a) or (b): (a) A method in which the polyvalent carboxylic acid component and the polyhydric alcohol component are polymerized with heating in the presence or absence of a polycondensation catalyst containing titanium, germanium, antimony, or the like, and by-products such as water and lower alcohol are discharged from the system; (b) A method of preparing a polymer with a low degree of polymerization by a method of reacting a polyvalent carboxylic acid component with a polyhydric alcohol component in the absence or presence of a catalyst to directly esterify the polymer, or a method of transesterifying a dialkyl ester of a polyvalent carboxylic acid component with a polyhydric alcohol component in the presence of a catalyst, and then maintaining the polymer with a low degree of polymerization and the catalyst at an appropriate temperature (e.g., about 240 to 310° C.) under
• the polycondensation catalyst used in the method for producing the crystalline polyethylene terephthalate resin is not particularly limited.
• a polycondensation catalyst containing titanium and/or germanium it is preferable to use a polycondensation catalyst containing germanium.
• the amount of the polycondensation catalyst used is, for example, 0.004% by mass or more, preferably 0.02% by mass or more, and, for example, 0.09% by mass or less, preferably 0.06% by mass or less, relative to the polyethylene terephthalate resin.
• germanium-based polycondensation catalyst When a germanium-based polycondensation catalyst is used as the polycondensation catalyst, it is preferable because it can reduce the food safety and hygiene risk associated with migration of eluted substances into food when a heat-resistant container for food is formed.
• the germanium-based polycondensation catalyst may be, for example, one or more selected from the group consisting of germanium oxide, hydroxide, halide, alcoholate, phenolate, etc. Specifically, one or more selected from the group consisting of germanium oxide, germanium hydroxide, germanium tetrachloride, tetramethoxygermanium, etc. may be used.
• a compound of manganese, zinc, calcium, magnesium, etc. which is used in the transesterification reaction, which is a step prior to polycondensation, may be used in combination.
• a phosphoric acid or phosphorous compound may be added to inactivate the polycondensation catalyst and terminate the reaction.
• the content of the polyethylene terephthalate resin in the resin composition for forming a heat seal layer is, for example, 70% by mass or more, preferably 80% by mass or more, and more preferably 90% by mass or more, with the total amount of the resin composition for forming a heat seal layer being 100% by mass.
• the styrene-(meth)acrylic acid ester-based resin having an epoxy group contained in the resin composition for forming a heat seal layer is a resin containing a styrene unit, a (meth)acrylic acid ester unit, and a monomer unit having an epoxy group as constituent units.
• one or more types of styrene-(meth)acrylic acid ester-based resin having an epoxy group can be used.
• Styrene units are units obtained by polymerizing styrene.
• the styrene units are, for example, 5% by mass or more, preferably 10% by mass or more, and, for example, 95% by mass or less, preferably 90% by mass or less, assuming that the total constituent units of the styrene-(meth)acrylic acid ester resin having an epoxy group is 100% by mass.
• the (meth)acrylic acid ester unit is a unit obtained by polymerizing a (meth)acrylic acid ester.
• the (meth)acrylic acid ester include (meth)acrylic acid esters having an alkyl group such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, nonyl (meth)acrylate, and stearyl (meth)acrylate; (meth)acrylic acid esters having an alicyclic group such as isobornyl (meth)acrylate and cyclohexyl (meth)acrylate; (meth)acrylic acid esters
• acrylic acid ester examples include (meth)acrylic acid esters having an alkoxy group such as polypropylene glycol (meth)acrylate; (meth)acrylic acid esters having a hydroxyl group such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate; (meth)acrylic acid esters having an amino group such as monoalkylaminoester (meth)acrylates such as monomethylaminoethyl (meth)acrylate, monoethylaminoethyl (meth)acrylate, monomethylaminopropyl (meth)acrylate, and monoethylaminopropyl (meth)acrylate; (meth)acrylic acid esters having a heterocyclic group such as (meth)acryloylmorph
• it is at least one member selected from the group consisting of (meth)acrylic acid esters having an alkyl group and (meth)acrylic acid esters having an alicyclic group, and more preferably, it is methyl (meth)acrylate.
• the (meth)acrylic acid ester units are, for example, 5% by mass or more, preferably 10% by mass or more, and, for example, 95% by mass or less, preferably 90% by mass or less, with the total constituent units of the styrene-(meth)acrylic acid ester resin having an epoxy group being 100% by mass.
• monomers having an epoxy group include one or more selected from the group consisting of glycidyl (meth)acrylate, (3,4-epoxycyclohexyl)methyl (meth)acrylate, (6-methyl-3,4-epoxycyclohexyl)methyl (meth)acrylate, allyl glycidyl ether, vinyl glycidyl ether, etc.
• it is one or more selected from the group consisting of glycidyl (meth)acrylate and (3,4-epoxycyclohexyl)methyl (meth)acrylate.
• the monomer having an epoxy group is, for example, 20% by mass or more, preferably 30% by mass or more, and for example, 60% by mass or less, preferably 50% by mass or less, based on 100% by mass of all constituent units of the styrene-(meth)acrylic acid ester resin having an epoxy group.
• the epoxy value of the styrene-(meth)acrylic acid ester resin having an epoxy group measured in accordance with ASTM D 1652 can be 0.5 meq/g or more, preferably 1.0 meq/g or more, and 3.0 meq/g or less, preferably 2.5 meq/g or less.
• the epoxy value of the styrene-(meth)acrylic acid ester resin having an epoxy group is less than 0.5 meq/g, there is a risk that sufficient melt viscosity cannot be maintained during the production of the heat seal layer, and the crystallization degree of the heat seal layer may increase, resulting in insufficient heat sealability. If the epoxy value exceeds 2.5 meq/g, there is a risk that repolymerization between polyethylene terephthalate resin molecules becomes excessive, resulting in the generation of gel foreign matter during the production of the heat seal layer.
• the styrene-(meth)acrylic acid ester resin having an epoxy group may contain a structural unit constituted of "other monomers" other than styrene, (meth)acrylic acid ester, and monomers having an epoxy group.
• the other monomer is not particularly limited and can be appropriately selected from monomers having a polymerizable carbon-carbon unsaturated bond that are copolymerizable with styrene, (meth)acrylic acid esters, and monomers having an epoxy group, such as vinyl esters (vinyl acetate, vinyl propionate, etc.), unsaturated nitriles (meth)acrylonitrile, etc., (meth)acrylamide, N-vinylpyrrolidone, hydroxymethylacrylamide, hydroxyethylacrylamide, etc.
• the amount of the other monomers is, for example, 50% by mass or less, and preferably 30% by mass or less, relative to 100% by mass of all constituent units of the styrene-(me
• the weight average molecular weight of the styrene-(meth)acrylic acid ester resin having an epoxy group is not particularly limited. For example, it is 2000 or more, preferably 3000 or more, and for example, 25000 or less, preferably 10000 or less.
• the polydispersity of the styrene-(meth)acrylic acid ester resin having an epoxy group is not particularly limited. For example, it is 1.1 or more, preferably 1.2 or more, and for example, 5.5 or less, preferably 5.0 or less.
• the styrene-(meth)acrylic acid ester resin having an epoxy group may be a commercially available product, or may be one obtained by polymerizing a predetermined monomer.
• commercially available products for example, the "Joncryl ADR” series (ADR 4368, etc.) manufactured by BASF Japan Ltd., and the "ARUFON UG-4000" series (UG-4035, UG-4040, UG-4070, etc.) manufactured by Toagosei Co., Ltd. can be used.
• a high-temperature continuous polymerization method disclosed in JP-A-59-6207 and JP-A-60-215007 can be used.
• a method can be used in which a predetermined monomer mixture is continuously fed at a constant feed rate into a reactor set at a predetermined temperature and pressure, and a reaction liquid is withdrawn in an amount corresponding to the amount fed.
• the content of the styrene-(meth)acrylic acid ester resin having an epoxy group in the resin composition for forming the heat seal layer is 0.1 parts by mass or more and 0.9 parts by mass or less per 100 parts by mass of the crystalline polyethylene terephthalate resin. It is preferably 0.1 parts by mass or more and 0.6 parts by mass or less, and more preferably 0.1 parts by mass or more and 0.5 parts by mass or less. If the content of the styrene-(meth)acrylic acid ester resin having an epoxy group exceeds 0.9 parts by mass, the resin composition for forming the heat seal layer may gel, and if it is less than 0.1 parts by mass, the heat sealability and film formability such as neck-in and drawdown may deteriorate.
• the polybutylene terephthalate resin that may be contained in the resin composition for forming a heat seal layer is a resin containing a structural unit derived from a terephthalic acid component and a structural unit derived from a 1,4-butanediol component. Since polybutylene terephthalate-based resins have lower hydrolysis resistance than polyethylene terephthalate-based resins, it becomes possible to easily carry out preliminary drying processes and the like in the production process of the resin composition for forming a heat seal layer and the container-forming material containing the resin composition for forming a heat seal layer.
• polystyrene-based resin a commercially available product may be used, or a product obtained by reacting a polyvalent carboxylic acid component containing a terephthalic acid component with a polyhydric alcohol component containing a 1,4-butanediol component by a known polymerization method may be used.
• the polycarboxylic acid component contains 60 mol% or more and 100 mol% or less of one or more terephthalic acid components selected from terephthalic acid, terephthalic acid halides (e.g., terephthalic acid dichloride, etc.), and terephthalic acid diesters (e.g., terephthalic acid dimethyl ester, etc.).
• terephthalic acid e.g., terephthalic acid dichloride, etc.
• terephthalic acid diesters e.g., terephthalic acid dimethyl ester, etc.
• isophthalic acid for example, one or more selected from the group consisting of isophthalic acid, orthophthalic acid, adipic acid, 2-chloroterephthalic acid, 2,5-dichloroterephthalic acid, 2-methylterephthalic acid, 4,4-stilbene dicarboxylic acid, 4,4-biphenyl dicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, bisbenzoic acid, bis(p-carboxyphenyl)methane, anthracene dicarboxylic acid, 4,4-diphenyl ether dicarboxylic acid, 4,4-diphenoxyethane dicarboxylic acid, 4,4-diphenyl ketone dicarboxylic acid, 4,4-diphenyl ether dicarboxylic acid, 5-Na sulfoisophthalic acid, ethylene-bis-p-benzoic acid, acid halides thereof, diesters
• the polyhydric alcohol component contains 70 mol% or more and 100 mol% or less of 1,4-butanediol.
• the polyhydric alcohol component other than 1,4-butanediol is not particularly limited.
• the method for producing polybutylene terephthalate resin is not particularly limited.
• the method is carried out by polymerizing the polyvalent carboxylic acid component and the polyhydric alcohol component while heating in the presence of a polycondensation catalyst containing titanium, germanium, antimony, etc., and discharging by-products such as water and lower alcohol out of the system.
• a polycondensation catalyst containing titanium and/or germanium it is preferable to use a polycondensation catalyst containing titanium and/or germanium, and it is particularly preferable to use a polycondensation catalyst containing germanium.
• the germanium-based polycondensation catalyst may be, for example, one or more selected from the group consisting of germanium oxide, hydroxide, halide, alcoholate, phenolate, etc.
• one or more selected from the group consisting of germanium oxide, germanium hydroxide, germanium tetrachloride, tetramethoxygermanium, etc. may be used.
• a compound of manganese, zinc, calcium, magnesium, etc., which is used in the transesterification reaction, which is a step prior to polycondensation may be used in combination.
• a phosphoric acid or phosphorous compound may be added to inactivate the polycondensation catalyst and terminate the reaction.
• the polybutylene terephthalate resin may be produced by either a batch polymerization method or a continuous polymerization method.
• the content of the polybutylene terephthalate resin in the resin composition for forming a heat seal layer is 0 parts by mass or more and less than 30 parts by mass relative to 100 parts by mass of the crystalline polyethylene terephthalate resin.
• the resin composition for forming a heat seal layer may not contain a polybutylene terephthalate resin.
• the content is preferably 0.1 parts by mass or more and 29.9 parts by mass or less relative to 100 parts by mass of the crystalline polyethylene terephthalate resin.
• the draw moldability is improved when a heat-resistant container is formed using a container-forming material having a heat seal layer and a base layer containing the resin composition for forming a heat seal layer, and the pinhole resistance and weather resistance that suppress the generation of pinholes when the container-forming material is heat-sealed can be improved.
• the content of the polybutylene terephthalate resin is 30 parts by mass or more per 100 parts by mass of the crystalline polyethylene terephthalate resin, the heat sealability of the polyethylene terephthalate resin may be impaired, and as a result, the heat sealability of the formed heat seal layer may be deteriorated.
• the resin composition for forming a heat seal layer may contain other components in addition to the polyethylene terephthalate resin, the styrene-(meth)acrylic acid ester resin having an epoxy group, and the polybutylene terephthalate resin, within a range that does not impair the performance required for the resin composition for forming a heat seal layer.
• Examples of other components include one or more selected from the group consisting of resins, antioxidants, heat stabilizers, ultraviolet absorbers, light stabilizers, lubricants, plasticizers, release agents, flame retardants, flame retardant assistants, antistatic agents, antifogging agents, reinforcing materials, colorants, color prevention agents, neutralizing agents, nucleating agents, film-forming assistants, processing assistants, and fillers.
• the container-forming material contains the resin composition for forming a heat-seal layer and is in the form of a film or sheet.
• the container-forming material may be, for example, a film or sheet containing the resin composition for forming a heat-seal layer.
• the container-forming material may be formed from a laminate having other layers such as a base layer in addition to a heat-seal layer containing a resin composition for forming a heat-seal layer.
• the container-forming material is preferably formed from a laminate having other layers such as a base layer in addition to a heat-seal layer.
• a container-forming material based on a film or sheet containing the resin composition for forming a heat seal layer can be obtained, for example, by forming the resin composition for forming a heat seal layer into a film by means of a casting method, an inflation molding method or the like.
• the film or sheet containing the resin composition for forming a heat seal layer is preferably formed using a casting method from the viewpoints of thickness uniformity, transparency, productivity, etc.
• the temperature of the resin composition for forming a heat seal layer during film formation is not particularly limited.
• a film forming method including a step of extruding a material containing the resin composition for forming a heat seal layer in a molten state from a T-die into a film or sheet, and contacting at least one side of the extruded film or sheet with a mirror surface such as a mirror roll or a mirror belt is preferred.
• the present invention from the viewpoint of removing foreign matter in a container-forming material based on a film or sheet containing a resin composition for forming a heat seal layer, it is preferable to use an extruder equipped with a vacuum vent mechanism that can remove impurities during molding, and it is even more preferable to produce the container using an extruder equipped with a sintered metal filter at the tip.
• the thickness of the container-forming material based on a film or sheet containing the resin composition for forming a heat seal layer is not particularly limited. For example, it is 5 ⁇ m or more, preferably 10 ⁇ m or more, more preferably 20 ⁇ m or more, and for example, 500 ⁇ m or less, preferably 300 ⁇ m or less, more preferably 200 ⁇ m or less. If the thickness of the container-forming material is less than 10 ⁇ m, it may be difficult to manufacture stably. If it exceeds 500 ⁇ m, there is a risk that secondary processability such as bending, cutting, and punching properties may decrease, and material costs will also increase, which is disadvantageous.
• the container-forming material based on a film or sheet containing the resin composition for forming a heat-sealing layer may be colorless and transparent, colored and transparent, or colored and opaque. Furthermore, at least one of the patterns selected from the group consisting of pictures, letters, figures, and the like may be formed on at least one surface of the container-forming material based on a film or sheet containing the resin composition for forming a heat-sealing layer.
• the coloring method may be one or more selected from the group consisting of a method of adding a colorant to a raw resin or a resin composition before molding, and a method of immersing a film after production in a dye-containing liquid.
• the pattern may be chromatic or achromatic. The method of forming the pattern is not particularly limited, and examples include printing, drawing by an operator, transfer, etc.
• the heat seal layer contains the resin composition for forming the heat seal layer.
• the thickness of the heat seal layer is not particularly limited. For example, it is 10 ⁇ m or more, preferably 20 ⁇ m or more, more preferably 30 ⁇ m or more, and for example, it is 120 ⁇ m or less, preferably 100 ⁇ m or less, more preferably 90 ⁇ m or less. If the thickness of the heat seal layer is less than 10 ⁇ m, the heat seal strength may be reduced, and the impact resistance of the formed heat-resistant container may be deteriorated.
• the thickness of the heat seal layer exceeds 120 ⁇ m, it is disadvantageous in terms of cost, and the harmony between flexibility and rigidity may not be achieved, and the bending resistance may be reduced.
• the heat-seal layer is the layer that comes into direct contact with food, etc. when a heat-resistant container is formed from the container-forming material, and is the layer that forms the so-called inner surface when the heat-resistant container is sealed.
• the base layer is not particularly limited as long as it holds the heat-seal layer and has properties that allow it to be used as a heat-resistant container when formed from the container-forming material.
• the base layer include one or more layers selected from the group consisting of a resin layer, a paper layer, and a metal layer, and one or more layers containing one or more of resin, paper, metal, etc.
• the resin layer may be one that has been stretched as necessary.
• the resin forming the resin layer may be, for example, one or more thermoplastic resins selected from the group consisting of polyester resins, polycarbonate resins, polyamide resins, polyolefin resins, styrene resins, vinyl halide resins, (meth)acrylic resins, ABS (acrylonitrile-butadiene-styrene copolymer) resins, polyurethane resins, etc.; one or more thermosetting resins selected from the group consisting of epoxy resins, urethane resins, phenolic resins, melamine resins, etc.; and one or more mixtures of these resins.
• polyester resins it is preferable to use polyester resins.
• the resin layer it is preferable for the resin layer to include a biaxially oriented polyester resin film layer.
• the resin layer forming the base layer is formed of a polyester resin
• an aromatic polyester resin film is not particularly limited, and various types can be used regardless of the type of polyester resin or whether the film is stretched.
• a biaxially stretched aromatic polyester resin film it is advantageous because it can form a base layer that has high tensile strength and rigidity and is excellent in printability.
• biaxially oriented aromatic polyester resin films include those containing at least one layer of a biaxially oriented polyethylene terephthalate resin film, a biaxially oriented polybutylene terephthalate resin film, and a biaxially oriented polyethylene naphthalate resin film.
• the biaxially oriented polyethylene terephthalate resin film layer is preferable because it is inexpensive and easy to procure those with various characteristics.
• the biaxially oriented polybutylene terephthalate resin film layer is preferable because it has excellent pinhole resistance.
• the biaxially oriented polyethylene naphthalate resin film layer has a high crystal melting peak temperature, excellent heat resistance, and excellent dead hold properties, and is also advantageous in imparting self-supporting properties to cooking bags (during and after cooking).
• an inorganic layer mainly composed of a metal and/or a metal oxide may be provided on at least one surface of the film.
• the method for forming the inorganic layer include a vacuum deposition method, an ion plating method, a sputtering method, and a CVD (Chemical Vapor Deposition) method.
• the thickness of the inorganic layer on the biaxially oriented polyester resin film is not particularly limited, and is, for example, 1 nm or more, preferably 5 nm or more, and for example, 300 nm or less, preferably 100 nm or less.
• the metal constituting the inorganic layer may be one or more selected from the group consisting of aluminum, silicon, magnesium, tin, silver, gold, stainless steel, titanium, etc.
• the metal oxide constituting the inorganic layer may be one or more selected from the group consisting of aluminum oxide, calcium oxide, silver oxide, gold oxide, silicon oxide, tin oxide, titanium oxide, iron oxide, magnesium oxide, etc.
• the biaxially stretched aromatic polyester resin film on which an aluminum vapor deposition layer is formed is industrially available at low cost, and it is possible to use an induction cooker or the like as a means for heating a heat-resistant container made of a container-forming material based on a laminate having a heat-sealing layer and a base layer.
• the biaxially stretched aromatic polyester resin film on which silica or alumina is vapor-deposited can impart gas barrier properties to a container-forming material based on a laminate having a heat-sealing layer and a base layer, and a heat-resistant container made of the container-forming material.
• the paper that constitutes the paper layer is not particularly limited as long as it is paper provided for packaging purposes, and can be applied regardless of type or basis weight.
• bleached kraft paper or fine paper can be used, and cooking bags made of bleached kraft paper or fine paper can be manufactured using a general bag making machine, and when placed on a pot or the like over an open flame, they do not melt or burst into flames, and the appropriate heat conduction allows ingredients to be cooked properly, making them a preferable choice.
• the metal constituting the metal layer is not particularly limited, and metals used in cooking utensils can be used. For example, one or more selected from the group consisting of aluminum, magnesium, silver, gold, iron, stainless steel, titanium, etc.
• the base layer is made of a metal layer or contains a metal layer, it becomes possible to use an induction cooker or the like as a means for heating a heat-resistant container made of a container-forming material based on a laminate having a heat seal layer and a base layer.
• aluminum foil When aluminum foil is used as the metal layer, it has excellent thermal conductivity, so that the efficiency of heating food materials is improved, and it is possible to impart light shielding and gas barrier properties to the container forming material based on the laminate having a heat seal layer and a base material layer and the heat-resistant container composed of the container forming material.
• the aluminum foil any type or thickness can be used as long as it is used for packaging purposes.
• alloy foils N8021 and N8079 materials and general foils 1N30 materials can be used.
• the container forming material is a laminate having the heat seal layer and the base material layer
• the base material layer has one or more layers selected from the group consisting of a biaxially oriented polyester resin layer, a paper layer, a metal-vapor-deposited biaxially oriented polyester resin layer, and a metal foil layer.
• the base material layer becomes the layer that becomes the outer surface of the heat-resistant container when the heat-resistant container is formed from the container-forming material, and is in direct contact with heated pots and frying pans, hot water, hot air, etc., when the heat-resistant container is heated.
• the base material layer is preferably a layer having heat resistance, and is preferably composed of one or more layers selected from the group consisting of, for example, a biaxially oriented aromatic polyester resin layer, a vapor-deposited biaxially oriented aromatic polyester resin layer, a paper layer, and a metal foil layer (aluminum foil, stainless steel foil, etc.).
• a container-forming material based on a laminate having a heat seal layer and a base layer when the base layer is a resin layer or a metal layer, there is no particular limitation on its thickness. For example, it is 5 ⁇ m or more, preferably 8 ⁇ m or more, more preferably 10 ⁇ m or more, and for example, 3000 ⁇ m or less, preferably 1500 ⁇ m or less, more preferably 1000 ⁇ m or less, even more preferably 500 ⁇ m or less, and even more preferably 300 ⁇ m or less. If the thickness of the base layer is in the range of 5 ⁇ m or more and 3000 ⁇ m or less, the rigidity and impact resistance of the container when a heat-resistant container is formed can be made practical. In addition, when the heat seal layer is laminated, a laminate with a good balance between flexibility and rigidity can be obtained.
• the basis weight is not particularly limited.
• the basis weight according to JIS P 8124 is, for example, 10 g/ m2 or more, preferably 14 g/ m2 or more, more preferably 40 g/ m2 or more, and for example, 300 g/ m2 or less, preferably 250 g/ m2 or less, more preferably 200 g/ m2 or less.
• the substrate layer may have one or more layers selected from the group consisting of an anchor coat layer, a colored layer, a printed pattern layer, a gas barrier layer, a light-shielding layer, an anti-reflection layer, an anti-glare layer, an anti-static layer, an anti-fouling layer, etc., provided on the surface as necessary.
• an anchor coat layer e.g., a colored layer, a printed pattern layer, a gas barrier layer, a light-shielding layer, an anti-reflection layer, an anti-glare layer, an anti-static layer, an anti-fouling layer, etc.
• a container-forming material and a heat-resistant container e.g., a cooking bag or a cooking dish
• the base layer can be roughened or cut out in order to provide an easy-to-open property when a heat-resistant container such as a heat-resistant bag is formed.
• the container-forming material itself can be roughened or cut out in order to provide an easy-to-open property when a heat-resistant container is formed.
• the method for producing the container-forming material based on the laminate having the heat seal layer and the base layer is not particularly limited.
• the heat seal layer and the base layer may be bonded directly or via an adhesive layer or an anchor coat layer.
• Examples of methods for producing a container-forming material based on a laminate having a heat seal layer and a base layer include the following (1) to (4): (1) A method of preparing a film or sheet containing the resin composition for forming a heat seal layer and a material for forming a base layer, and optionally subjecting at least one of the adhesive surfaces to an easy-adhesion treatment, and then passing these between a pair of heated rolls or non-heated rolls as required to continuously laminate them, a press thermocompression bonding method, or a method of laminating them while forming them under compressed air or vacuum; (2) A method in which a film or sheet containing the resin composition for forming a heat seal layer and a material for forming a base layer are prepared, and an adhesive is applied to at least one of them, and then
• the base layer is a resin layer
• a heat seal layer is formed by a co-extrusion method or an extrusion lamination method
• a container-forming material is constructed based on a laminate having a heat seal layer and a base layer, so that even if a heat-resistant container made of the container-forming material is overheated, leaching of low molecular weight components derived from the adhesive can be suppressed.
• the base layer is a paper layer
• a method of directly laminating the molten heat seal layer-forming resin composition onto the paper layer using an extrusion lamination molding machine is simple and preferable because it can further suppress the elution of low molecular weight components, etc.
• the paper layer can be coated with an anchor coating agent, but it is preferable not to use an anchor coating agent because it can further reduce the elution of low molecular weight components, etc.
• the heat sealability can be improved by lowering the temperature of the cooling roll and rapidly cooling the resin composition for forming the heat seal layer to suppress its crystallinity.
• This allows the heat sealability to be exhibited at low temperatures, and also makes it possible to improve the heat seal strength when heat sealing is performed under the same temperature conditions. For example, by setting the chill roll (cooling roll) temperature during extrusion lamination to 40°C or less and controlling it so that the chill roll itself does not condense, the crystallinity of the heat seal layer can be suppressed to 15% or less.
• the adhesive used in manufacturing a container-forming material based on a laminate having a heat seal layer and a base material layer is not particularly limited, and one or more of a solvent-free adhesive, a water-based adhesive, a solvent-based adhesive, a hot melt adhesive, a two-component curable adhesive, an active energy ray curable adhesive, etc. can be used.
• a solvent-free adhesive a water-based adhesive, a solvent-based adhesive, a hot melt adhesive, a two-component curable adhesive, an active energy ray curable adhesive, etc.
• the hot melt adhesive is a material with a sufficiently high melting point.
• the shape of the heat-resistant container is not particularly limited.
• a heat-resistant bag such as a bag-shaped bag.
• the heat-resistant bag include general three-sided bags, palm-shaped bags, gusseted bags, and self-supporting bags with a bottom.
• the heat-resistant bag can be processed so that it can be sealed after the contents are poured in.
• a rigid container can be made by utilizing the rigidity of the thickness of the container-forming material or the combination of materials. In this case, the container can be an open container like a plate, rather than a sealed container for the contents.
• the heat-resistant bag which is a heat-resistant container in the form of a bag, may be provided with a zipper so that it can be opened and sealed by a simple means.
• the material of the zipper is preferably a material that can be welded to the heat seal layer, and can be, for example, a polyester-based resin contained in the resin composition for forming the heat seal layer.
• the heat-resistant bag may be roughened or cut out.
• the heat-resistant bag may also be provided with a cutout for forming a gas vent after sealing.
• Figure 1 is a schematic diagram of a first heat-resistant bag according to one embodiment of the heat-resistant container of the present invention, and how the first heat-resistant bag is formed by heat sealing.
• 101 is a member for the front of the first heat-resistant bag
• 102 is a member for the back of the first heat-resistant bag
• 103 is a member for the bottom of the first heat-resistant bag.
• 110 is a heat-sealed part of the first heat-resistant bag
• 120 is a preform of the first heat-resistant bag
• 130 is an unnecessary part that has been cut off as an unnecessary part
• 121 is the first heat-resistant bag in a folded state
• 122 is the first heat-resistant bag in an unfolded state.
• the first heat-resistant bag 121 in the folded state shown in FIG. 1 (1C) and the first heat-resistant bag 122 in the unfolded state shown in FIG. 1 (1D) can be produced, for example, by the following method.
• a first heat-resistant bag front member 101 and a first heat-resistant bag rear member 102 are produced from a container forming material having a heat seal layer.
• the first heat-resistant bag front member 101 is a rectangle composed of a first heat-resistant bag front member first side portion 101a and a first heat-resistant bag front member second side portion 101b
• the first heat-resistant bag rear member 102 is a rectangle composed of a first heat-resistant bag rear member first side portion 102a and a first heat-resistant bag rear member second side portion 102b
• the first heat-resistant bag front member first side portion 101a and the first heat-resistant bag rear member first side portion 102a, and the first heat-resistant bag front member second side portion 101b and the first heat-resistant bag rear member second side portion 102b are each the same length.
• the first heat-resistant bag bottom member 103 is made from a container forming material having a heat seal layer.
• the first heat-resistant bag bottom member first side 103a of the first heat-resistant bag bottom member 103 is the same length as the first heat-resistant bag front member first side 101a of the first heat-resistant bag front member 101 and the first heat-resistant bag rear member first side 102a of the first heat-resistant bag rear member 102.
• the shapes of the first heat-resistant bag front member 101, the first heat-resistant bag back member 102, and the first heat-resistant bag bottom member 103 in FIG. 1 are merely examples, and various shapes and sizes are possible depending on the shape and capacity of the first heat-resistant bag to be formed.
• the first heat-resistant bag front member 101 and the first heat-resistant bag back member 102 are arranged so that their heat seal layers face each other, and the first heat-resistant bag bottom member 103, which is folded in half so that the base layers are in contact with each other, is inserted between them, and then these are stacked.
• the first heat-resistant bag front member 101, the first heat-resistant bag rear member 102, and the first heat-resistant bag bottom member 103 are The first side portion 101a of the first heat-resistant bag front member, the first side portion 102a of the first heat-resistant bag rear member, and the first side portion 103a of the first heat-resistant bag bottom member overlap each other.
• the first heat-resistant bag front member second side portion 101b, the first heat-resistant bag rear member second side portion 102b, and the first heat-resistant bag bottom member fold line end portion 103c of the first heat-resistant bag bottom member fold line 103b in the first heat-resistant bag bottom member 103 overlap each other. They are arranged as follows.
• the first heat-resistant bag front member 101, the first heat-resistant bag back member 102, and the first heat-resistant bag bottom member 103 are stacked together and heat-sealed to provide a heat-sealed portion 110 of any width including the first heat-resistant bag bottom member first side portion 103a and the first heat-resistant bag front member second side portion 101b, and an oblique heat-sealed portion 111 of any width formed starting from the fold line end portion 103c of the first heat-resistant bag bottom member and intersecting with the first heat-resistant bag front member second side portion 101b at an intersection angle ⁇ , thereby obtaining a heat-resistant bag preform 120.
• a cutting process is performed along the cut line C in the oblique heat-sealed portion 111 shown in Fig. 1 (1B), and unnecessary portion 130 is removed as shown in Fig. 1 (1C) to form a first heat-resistant bag 121 in a folded state.
• the first heat-resistant bag 121 in a folded state is unfolded to form a first heat-resistant bag 122 in an unfolded state as shown in Fig. 1 (1D).
• first heat-resistant bag 122 in the unfolded state allows the area of the bottom to be increased, so that when the bag is placed on a metal plate, frying pan, pot, or the like that is sufficiently heated by an open flame, the contact area can be increased, thereby increasing the heating efficiency for the inside of the heat-resistant bag.
• At least the first heat-resistant bag front member 101 and the first heat-resistant bag back member 102 are made of a transparent container-forming material, which allows the inside of the first heat-resistant bag to be visualized and increases the convenience of the bag when used as a cooking bag.
• the first heat-resistant bag bottom member 103 out of a container-forming material containing a metal such as paper or aluminum foil as a base material, it is possible to prevent the heat-resistant bag from welding to a heated metal plate, frying pan, pot, etc.
• the first heat-resistant bag bottom member 103 out of a container-forming material containing a metal such as aluminum foil as a base material, it is possible to efficiently conduct heat from a heated metal plate, frying pan, pot, etc. to the inside of the heat-resistant bag.
• Figure 2 is a schematic diagram for forming a second heat-resistant bag by heat sealing according to one embodiment of the heat-resistant container of the present invention.
• 201 is a member for the front of the second heat-resistant bag
• 202 is a member for the back of the second heat-resistant bag
• 203 is a member for the bottom of the second heat-resistant bag
• 204 is a member for the first side of the second heat-resistant bag
• 205 is a member for the second side of the second heat-resistant bag.
• 210 is a heat-sealed part of the second heat-resistant bag
• 220 is the second heat-resistant bag in a folded state
• 221 is the second heat-resistant bag in an unfolded state.
• the second heat-resistant bag 220 in the folded state shown in FIG. 2 (2B) and the second heat-resistant bag 221 in the unfolded state shown in FIG. 2 (2C) can be produced, for example, by the following method.
• a second heat-resistant bag front member 201 and a second heat-resistant bag rear member 202 are produced from a container forming material having a heat seal layer.
• the second heat-resistant bag front member 201 is a rectangle composed of a second heat-resistant bag front member first side portion 201a and a second heat-resistant bag front member second side portion 201b
• the second heat-resistant bag rear member 202 is a rectangle composed of a second heat-resistant bag rear member first side portion 202a and a second heat-resistant bag rear member second side portion 202b
• the second heat-resistant bag front member first side portion 201a and the second heat-resistant bag rear member second side portion 202a, and the second heat-resistant bag front member second side portion 201b and the second heat-resistant bag rear member second side portion 202b are each the same length.
• a second heat-resistant bag bottom member 203 is produced from a container forming material having a heat seal layer.
• a first side portion 203a of the second heat-resistant bag bottom member 203 is the same length as a first side portion 201a of the second heat-resistant bag front member 201 in the second heat-resistant bag front member 201 and a first side portion 202a of the second heat-resistant bag rear member 202 in the second heat-resistant bag rear member 202.
• a first side surface member 204 of the second heat-resistant bag and a second side surface member 205 of the second heat-resistant bag are produced from the container forming material having a heat seal layer.
• a first side portion 204a of the first side surface member of the second heat-resistant bag and a first side portion 205a of the second side surface member of the second heat-resistant bag are the same length as a second side portion 201b of the front surface member of the second heat-resistant bag and a second side portion 202b of the rear surface member of the second heat-resistant bag.
• the shapes of the second heat-resistant bag front member 201, the second heat-resistant bag back member 202, the second heat-resistant bag bottom member 203, the second heat-resistant bag first side member 204, and the second heat-resistant bag second side member 205 in Figure 2 are only examples, and various shapes and sizes are possible depending on the shape and capacity of the heat-resistant bag to be formed.
• the second heat-resistant bag front member 201 and the second heat-resistant bag back member 202 are arranged so that the heat seal layers face each other, and between them, the second heat-resistant bag bottom member 203 folded in half so that the base layers are in contact with each other, the second heat-resistant bag first side member 204 folded in half so that the base layers are in contact with each other and a first fold-back portion 206 is formed on one side of the first edge portion 204a of the second heat-resistant bag first side member, and the second heat-resistant bag second side member 205 folded in half so that the base layers are in contact with each other and a second fold-back portion 207 is formed on one side of the first edge portion 205a of the second heat-resistant bag second side member are inserted and overlapped.
• the second heat-resistant bag bottom member 203 is arranged so that the second heat-resistant bag bottom member fold line 203b fits into the first fold-back portion 206 and the second fold-back portion 207.
• the first side portion 201a of the second heat-resistant bag front member, the first side portion 202a of the second heat-resistant bag rear member, and the first side portion 203a of the second heat-resistant bag bottom member overlap each other.
• the intersection of the first side portion 201a of the second heat-resistant bag front surface member and the second side portion 201b of the second heat-resistant bag front surface member overlaps with the first side end portion 204b of the second heat-resistant bag first side surface member,
• the second side portion 201b of the second heat-resistant bag front member, the second side portion 202b of the second heat-resistant bag rear member, the fold line end portion 203c of the second heat-resistant bag bottom member, the first side portion 204a of the second heat-resistant bag first side member, and the first folded-back portion end portion 206a overlap each other.
• the intersection of the first side portion 201a of the second heat-resistant bag front surface member and the second side portion 201b of the second heat-resistant bag front surface member overlaps with the first side end portion 205b of the second heat-resistant bag second side surface member.
• the second side portion 201b of the second heat-resistant bag front member, the second side portion 202b of the second heat-resistant bag rear member, the fold line end portion 203c of the second heat-resistant bag bottom member, the first side portion 205a of the second heat-resistant bag second side member, and the second folded-back portion end portion 207a overlap each other. They are arranged as follows.
• the second heat-resistant bag front member 201, the second heat-resistant bag rear member 202, the second heat-resistant bag bottom member 203, the second heat-resistant bag side member 204, and the second heat-resistant bag side member 205 are stacked and heat-sealed to form the second heat-resistant bag front member first side portion 201a, the second heat-resistant bag rear member first side portion 202a, the second heat-resistant bag bottom member first side portion 203a, and the second heat-resistant bag side member first side portion 204a.
• a second heat-resistant bag heat seal portion 210 of an arbitrary width is provided in a portion including the second side portion 201b of the heat-resistant bag front member, the second side portion 202b of the second heat-resistant bag rear member, and the first side portion 204a of the second heat-resistant bag, and in a portion including the second side portion 201b of the second heat-resistant bag front member, the second side portion 202b of the second heat-resistant bag rear member, and the first side portion 205a of the second heat-resistant bag, to form a second heat-resistant bag 220 in a folded state.
• the second heat-resistant bag 220 in a folded state is unfolded to form a second heat-resistant bag 221 in an unfolded state as shown in FIG. 2 (2C).
• the second heat-resistant bag front member 201 and the second heat-resistant bag back member 202 are made of a transparent container-forming material, which makes the inside of the heat-resistant bag visible and increases the convenience of the bag when used as a cooking bag.
• the second heat-resistant bag bottom member 203 out of a container-forming material containing a metal such as paper or aluminum foil as a base material, it is possible to prevent the heat-resistant bag from welding to a heated metal plate, frying pan, pot, etc.
• the second heat-resistant bag bottom member 203 out of a container-forming material containing a metal such as aluminum foil as a base material, it is possible to efficiently conduct heat from a heated metal plate, frying pan, pot, etc. to the inside of the heat-resistant bag.
• Fig. 3 is a schematic diagram of a heat-resistant bag according to one embodiment of the heat-resistant container of the present invention and a method for forming the heat-resistant bag by heat sealing.
• 301 is a third heat-resistant bag member made of a heat-resistant bag forming material
• 310 is a heat-sealed part of the third heat-resistant bag
• 320 is the third heat-resistant bag in a folded state
• 321 is the third heat-resistant bag in an unfolded state.
• the shape of the third heat-resistant bag member 301 and the folding width of the third heat-resistant bag member are merely examples, and various shapes and sizes can be used depending on the shape and capacity of the heat-resistant bag to be formed.
• the third heat-resistant bag 320 in the folded state shown in FIG. 3 (3B) and the third heat-resistant bag 321 in the unfolded state shown in FIG. 3 (3C) can be produced, for example, by the following method.
• the third heat-resistant bag member 301 which is a square shape having a heat seal layer, is folded into a W shape (inverted M shape) so that the heat seal layer is on the inside.
• a rectangular container-forming material is folded in half so that the base layers correspond to each other, and then folded symmetrically in the opposite direction to the center fold to obtain a desired bottom area, thereby forming the third heat-resistant bag member 301 into a W shape (inverted M shape).
• the end including the side where the fold is formed is heat-sealed to provide a third heat-resistant bag heat-sealed portion 310 as shown in FIG. 3 (3B), forming a third heat-resistant bag in a folded state.
• the third heat-resistant bag 320 in a folded state is unfolded to form a third heat-resistant bag 321 in an unfolded state as shown in FIG. 3 (3C).
• the third heat-resistant bag shown in Figure 3 there is no heat-sealed portion at the bottom of the heat-resistant bag that comes into contact with a heated metal plate, frying pan, pot, etc., so the bottom contact area can be increased and peeling of the heat-sealed portion during heating can be suppressed.
• the third heat-resistant bag shown in Table 3 can be produced by a simple method.
• Fig. 4 is a schematic diagram of a heat-resistant plate according to one embodiment of the heat-resistant container of the present invention.
• 421 is a heat-resistant plate.
• the heat-resistant plate 421 can be manufactured, for example, by the following method.
• the container-forming material having a heat seal layer is cut to a predetermined size and indirectly heated with a far-infrared ray radiating heater to soften the container-forming material, and is quickly placed on, for example, the lower die of a deep drawing machine, and the upper die is lowered from above the container-forming material and held in this state for a predetermined time to form a heat-resistant plate of a predetermined size.
• the peripheral portion is cut as necessary to form the heat-resistant plate 421 shown in FIG. 4.
• the use of the heat-resistant container is not particularly limited. It is preferable to use the heat-resistant container as a container for heating items, materials, etc. in the container by utilizing the heat-resistant properties of the container. For example, a cooking use for putting food materials in the heat-resistant container and cooking them with heat can be mentioned.
• An example of using the heat-resistant container for cooking can be a cooking bag use for deep-frying food using heated oil in a heat-resistant bag, which is a heat-resistant container such as a bag.
• the heat-resistant bag When deep-frying is performed using a heat-resistant bag, which is a heat-resistant container such as a bag, the heat-resistant bag can be placed on a heat source such as a heated iron plate, frying pan, pot, oven, etc.
• the heat-resistant bag is preferably a bag having a bottom so that it can be stably placed on a heat source such as a heated iron plate, frying pan, pot, oven, etc.
• a heat-resistant bag having a flat bottom as shown in Fig. 1 (1D), Fig. 2 (2C), and Fig. 3 (3C) can be used.
• This can improve the heating efficiency of the food and cooking liquid (deep-frying oil, etc.) inside the heat-resistant bag, and can be stably placed on a heat source such as a heated iron plate, frying pan, pot, oven, etc., thereby preventing the occurrence of a situation in which the heat-resistant bag falls over and the heated cooking liquid (heated deep-frying oil, etc.) in the bag spills.
• a heat source such as a heated iron plate, frying pan, pot, oven, etc.
• any part of the heat-resistant container for example, the entire heat-resistant container or parts other than the bottom of the heat-resistant container, may be made of a (semi-)transparent container-forming material.
• the cooking method according to the present invention is a cooking method in which cooking is performed using the heat-resistant container.
• the heat-resistant container may be a bag-shaped heat-resistant bag or a plate-shaped heat-resistant dish.
• the heat-resistant bag is the cooking bag
• the heat-resistant dish is the cooking dish.
• Fig. 5 shows a schematic diagram of cooking using the heat-resistant bag, which is a bag-shaped heat-resistant container shown in Fig. 1 (1D), as a cooking bag.
• 501 is a cooking utensil
• 510 is a heating means (direct flame in Fig. 5)
• 520 is a cooking bag
• 530 is ingredients
• 531 is seasonings and cooking liquid.
• a frying pan is used as the cooking utensil, but a pot, a griddle, an induction cooking heater, an oven, etc. can also be used.
• the cooking utensil 501 is heated by the heating means 510 , which heats the cooking bag 520 placed on the cooking utensil 501 .
• the cooking bag 520 contains ingredients 530, seasonings, cooking liquid 531, etc., within the cooking bag 520, and has an opening 521 for removing the cooked food after cooking is completed.
• ingredients 530 and seasonings/cooking liquid 531 may be stored in advance inside the cooking bag 520.
• the ingredients 530 are not particularly limited as long as they are something to be cooked (cooked material).
• ingredients of any shape one or more selected from the group consisting of meat, seafood, vegetables, processed grain products such as noodles, rice, etc.
• These ingredients may be ones that have been previously subjected to a heat treatment or the like.
• the seasonings/cooking liquid 531 are not particularly limited as long as they are used in cooking the ingredients (cooked material), and for example, one or more selected from the group consisting of water, cooking oil, soup stock, soy sauce, sake, sugar, salt, fried chicken powder, spices, etc. can be mentioned.
• the cooking bag 520 containing ingredients 530, seasonings, cooking liquid 531, etc. may have an opening 521 sealed by heat sealing or the like.
• an opening process can be performed along the heat seal made to the opening 521 to form the opening 521.
• the cooking bag 520 does not contain ingredients 530 or seasonings/cooking liquid 531 in advance, or when only seasonings/cooking liquid 531 are contained, the user puts ingredients 530 into the cooking bag 520 through the opening 521.
• seasonings/cooking liquid are contained in the cooking bag 520, the user can mix the seasonings/cooking liquid 531 with the ingredients 530 by kneading or shaking the cooking bag 520 from the outside after putting ingredients 530 into the cooking bag 520.
• the cooking bag 520 can be easily reclosed due to the dead hold properties of the heat seal layer that constitutes the innermost layer. This can prevent ingredients 530 and seasonings/cooking liquid 531 from spilling out of the cooking bag 520.
• the cooking bag 520 for which preparation has been completed is heated by a heating means.
• the heating means is not particularly limited, but examples thereof include placing the cooking bag so that the bottom of the cooking bag is in contact with a metal plate, frying pan, pot, etc. that is sufficiently heated by direct flame or an induction heater, or placing the cooking bag in a preheated oven or heating the cooking bag in an oven.
• a method of placing the cooking bag 520 for which preparation has been completed on a cooking utensil 501 on a heating means 510, which is an open flame is exemplified.
• it is preferable to stir the ingredients 530 moderately to prevent the chicken meat from becoming integrated (sticking or sticking to each other).
• the heat of the cooking oil cooks the chicken meat 530, completing the deep-frying process (deep-fried chicken).
• the completed deep-frying process (deep-fried chicken) is then removed from the cooking bag 520, completing the cooking process.
• cooking may also be completed by discharging the seasonings and cooking liquid 531, such as cooking oil, from the cooking bag 520.
• the used edible oil may be disposed of as waste oil.
• the edible oil used in the cooking bag 520 is cooled for an appropriate period of time, and then a waste oil treatment agent or the like is poured into the cooking bag 520, so that the edible oil in the cooking bag 520 can be easily disposed of.
• a waste oil treatment agent or the like is poured into the cooking bag 520, so that the edible oil in the cooking bag 520 can be easily disposed of.
• oil stains on the cooking utensils 501 and the like are suppressed, so that the effort required for cleaning after cooking can be significantly reduced.
• the degree of crystallinity of the crystalline polyester resin in the heat seal layer and base material layer of the container forming material that constitutes the cooking bag 520 can be increased by heating during cooking, thereby improving the rigidity of the cooking bag 5220.
• the cooking bag 520 can also be used directly as tableware.
• cooking method of the present invention may also be performed using cooking dish 421 shown in Fig. 4.
• cooking can be performed by placing ingredients on cooking dish 421 and placing the bottom of cooking dish 421 on a metal plate, frying pan, pot, or the like that has been sufficiently heated by direct flame or induction heater so that the bottom of cooking dish 421 is in contact with the metal plate, frying pan, pot, or the like, or by placing the cooking dish in a preheated oven or by heating the cooking dish in an oven.
• cooking (heating) can also be performed using a microwave oven.
• the cooking method of the present invention also includes a method of heating a heat-resistant container containing ingredients in an oven.
• the heat-resistant container of the present invention is very suitable for oven cooking in which ingredients are heated in a high-temperature chamber due to its heat resistance.
• the base layer of the laminate is not limited as long as it is a material that can withstand the cooking temperature, but it is preferable to use a metal foil or paper, which has excellent heat resistance, as the base layer.
• Examples of the present invention will be described below, but the present invention is not limited to these examples.
• the blending amounts of the components are in parts by mass.
• St-GM styrene-(meth)acrylic acid ester resin having an epoxy group (manufactured by BASF Japan Ltd., "JONCRYL ADR-4368-CS”)
• oPET biaxially stretched polyester film (manufactured by Toyobo Co., Ltd., "E5102", thickness 12 ⁇ m or 25 ⁇ m)
• ⁇ Heat seal layer film formability> A: The neck-in amount at both ends of the film extruded from a 400 mm wide die is less than 25 mm, and less than 5 gels or fish eyes measuring 0.5 mm ⁇ or more and less than 1.5 mm ⁇ occur per 1 m2 of film, and no gels or fish eyes measuring 1.5 mm ⁇ or more occur.
• the neck-in amount at both ends of the film discharged from a die having a width of 400 mm was 75 mm or more.
• the neck-in amount referred to here was calculated by the following formula, where WD is the die width and W is the extruded film width.
• Neck-in amount [mm] (WD-W)/2
• a and B are acceptable and C is unacceptable.
• ⁇ Container formability> (Heat-sealing properties of heat-resistant bags) A: Shows a seal strength of 3 N/15 mm or more per 15 mm heat seal width at 140° C., 1 second, and 0.2 MPa. B: Shows a seal strength of less than 3 N/15 mm per 15 mm heat seal width at 140° C., 1 second, and 0.2 MPa. (Deep drawability of heat-resistant plates) A: It is not cracked or torn. B: Cracks or tears have occurred. In the present invention, A is pass and B is fail.
• C Between the start and end of heating, a large amount of oil leaks out of the heat-resistant container onto the frying pan. In the present invention, A and B are acceptable and C is unacceptable.
• Example 1 100 parts by mass of PET1 and 0.1 parts by mass of St-GM were mixed for 5 minutes in a Henschel mixer to prepare a resin composition for forming a heat seal layer.
• oPET was inserted as a base layer to pressure-bond the heat seal layer and the base layer, and a container-forming material having a layer structure of a heat seal layer/base layer was produced by an extrusion lamination method.
• the obtained container-forming material was cut into two pieces of 150 mm x 160 mm to prepare parts for the front and back of the heat-resistant bag.
• the obtained container-forming material was cut into two pieces of 150 mm x 90 mm to prepare parts for the bottom. As shown in FIG.
• the front member and the back member were arranged so that the heat-sealed layers faced each other, and the heat-resistant bag bottom member folded in half was inserted between them so that the base layers were in contact with each other, and these were stacked.
• a heat-sealed portion of any width was formed by heat-sealing predetermined positions such as each end using an impulse sealer, and unnecessary parts were cut off to prepare a heat-resistant container (heat-resistant bag) having an opening as shown in FIG. 1 (1D).
• the heat seal layer film-forming property of the obtained resin composition for forming a heat seal layer, the container moldability of the obtained container-forming material, and the oil leakage resistance (oil retention) and crispiness of the obtained heat-resistant container (heat-resistant bag) were evaluated. The results are shown in Table 1.
• Examples 2 to 15, Comparative Examples 1 to 3 A resin composition for forming a heat seal layer was prepared in the same manner as in Example 1, except that the composition and thickness of the heat seal layer were as shown in Tables 1 and 2.
• a container-forming material having a layer structure of a heat seal layer/substrate layer was prepared in the same manner as in Example 1, except that the substrate layer was one shown in Tables 1 and 2. Using the obtained container-forming material, a heat-resistant container (heat-resistant bag) was produced in the same manner as in Example 1.
• the heat seal layer film-forming property of the obtained resin composition for forming a heat seal layer, the container moldability of the obtained container-forming material, and the oil leakage resistance (oil retention) and crispiness of the obtained heat-resistant container (heat-resistant bag) were evaluated. The results are shown in Table 1.
• Example 16 A heat-resistant container (heat-resistant bag) was produced in the same manner as in Example 1, using the container-forming material used in Example 1 as the front member 1 and the back member 2, and the container-forming material used in Example 3 as the bottom member 3.
• Example 17 and 18 A resin composition for forming a heat seal layer was prepared in the same manner as in Example 1, except that the composition and thickness of the heat seal layer were as shown in Table 3.
• a container-forming material having a layer structure of a heat seal layer/anchor coating agent coating layer/substrate layer was produced by extrusion lamination in the same manner as in Example 1, except that a two-component polyurethane-based anchor coating agent ("Takelac A-3210/Takenate A-3075" manufactured by Mitsui Chemicals, Inc.) was applied to one side and dried to form a substrate layer of oPET or aluminum foil (AL).
• a heat-resistant container heat-resistant container of the first embodiment; heat-resistant bag
• Example 1 a heat-resistant container of the first embodiment; heat-resistant bag
• Example 19 A resin composition for forming a heat seal layer was prepared in the same manner as in Example 1, except that the composition and thickness of the heat seal layer were as shown in Table 3.
• the obtained resin composition for forming a heat seal layer was put into a T-die film-forming machine equipped with a Dulmage screw having a diameter of 40 mm and an L/D ratio of 31, and a heat seal layer having a thickness of 40 ⁇ m was formed at a die temperature of 285° C., and a film of the resin composition for forming a heat seal layer was produced by contacting the die with a cooling roll.
• a two-component curing polyurethane adhesive (manufactured by Rock Paint, "RU-40/H-4", adhesive for dry lamination) was applied to one side of oPET, which was then dried to form a substrate layer.
• the film thus prepared was laminated on the adhesive-coated side of the substrate layer, and a container-forming material having a layer structure of a heat seal layer/adhesive layer for dry lamination/substrate layer was produced by dry lamination in which the film was pressed against the substrate using a heated roll.
• a heat-resistant container heat-resistant container of the first embodiment; heat-resistant bag
• Example 20 A resin composition for forming a heat seal layer was prepared in the same manner as in Example 1, except that the composition and thickness of the heat seal layer were as shown in Table 3.
• a container-forming material having a layer structure of a heat seal layer/substrate layer was prepared in the same manner as in Example 1, except that the substrate layer was one shown in Table 3.
• the obtained container-forming material was cut into 300 mm x 300 mm pieces, which were indirectly heated with a far-infrared irradiating heater to soften the container-forming material, and quickly placed on the mold of a tabletop plug-assist molding machine, and the mold was lowered from above the container-forming material and held for 30 seconds to mold a round dish-shaped container with a diameter of 100 mm and a maximum depth of 30 mm.
• the material was cut leaving a flange portion 10 mm wide from the periphery to produce a heat-resistant container (heat-resistant container of the fourth embodiment; heat-resistant dish).
• the present invention provides a heat-resistant container that can be placed on a cooking utensil such as a pot or frying pan that is directly placed on a fire and has heat resistance that allows it to be used to easily cook stir-fried or deep-fried foods, and reduces the hassle of washing the cooking utensil, cleaning the kitchen, and disposing of waste oil when deep-frying foods. This makes it easy to cook stir-fried or deep-fried foods. It also makes it possible to cook according to one's own recipes without being limited to ready-made recipes. Furthermore, the heat-resistant container can be used as tableware at the dining table as is.

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Laminated Bodies (AREA)

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• 2023
  • 2023-11-09 CN CN202380075884.4A patent/CN120091780A/zh active Pending
  • 2023-11-09 JP JP2024557838A patent/JPWO2024101409A1/ja active Pending
  • 2023-11-09 WO PCT/JP2023/040329 patent/WO2024101409A1/ja not_active Ceased
  • 2023-11-09 KR KR1020257014180A patent/KR20250108596A/ko active Pending

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