Classifications

• • 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
  • B65D29/00—Sacks or like containers made of fabrics; Flexible containers of open-work, e.g. net-like construction
• • 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
  • B65D65/02—Wrappers or flexible covers
• • 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
  • B65D65/46—Applications of disintegrable, dissolvable or edible materials
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D105/00—Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/60—Additives non-macromolecular
  • C09D7/63—Additives non-macromolecular organic
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
  • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

• the present invention relates to a pouch comprising a water-soluble film, a laminate comprising a water-soluble film and a support, and a coating agent for forming a water-soluble film.
• Patent Document 1 A method is known in which a liquid drug is packaged in a water-soluble film to form a pouch, and when in use, the pouch is placed in water and the contents, including the film, are dissolved in the water before use (Patent Document 1).
• the pouch is filled with laundry detergent or the like, and the pouch has low solubility in cold water, it takes a long time for the pouch to dissolve, which can result in some of the detergent remaining on the clothes.
• polysaccharides can have low solubility in cold water.
• Pouches containing contents also need to have sufficient mechanical strength to prevent damage during transportation.
• the present invention aims to provide a pouch containing a water-soluble film that has excellent solubility and mechanical strength at low temperatures, a laminate containing a water-soluble film and a support, and a coating agent for forming the water-soluble film.
• the present invention includes the following preferred aspects.
• a pouch comprising a water-soluble film containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof.
• plasticizer is at least one selected from the group consisting of polyhydric alcohols, hydroxy acids, monosaccharides, and disaccharides.
• plasticizer is at least one selected from the group consisting of glycerin, diglycerin, sorbitol, alkylene glycol, polyalkylene glycol, trimethylolpropane, erythritol, 2-methyl-1,3-propanediol, lactic acid, glucose, fructose, maltose, and trehalose.
• the content of the plasticizer is 20 to 95% by mass relative to the mass of the water-soluble film.
• the water-soluble film further contains a polysaccharide B different from the polysaccharide A.
• the pouch according to any one of [1] to [13], containing therein at least one selected from the group consisting of a cleaning agent, a fabric softener, and a fragrance.
• a water-soluble film containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof.
• a water-soluble film comprising at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof, and a polysaccharide B different from the polysaccharide A.
• a water-soluble film for use in a pouch comprising at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof, and a plasticizer, the content of the plasticizer being 45% by mass or less relative to the mass of the water-soluble film.
• a laminate comprising the water-soluble film according to any one of [15] to [17] and a support, wherein the support is paper or a film.
• a packaging material comprising the water-soluble film according to [15].
• the present invention can provide a pouch containing a water-soluble film that has excellent solubility and mechanical strength at low temperatures, a laminate containing a water-soluble film and a support, and a coating agent for forming the water-soluble film.
• the pouch of the present invention comprises a water-soluble film containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum and derivatives thereof.
• Tamarind seed gum is a polysaccharide obtained from the seeds of tamarind (Tamarindus indica), and has a structure in which glucose is the main chain and xylose and galactose are bonded to the side chains.
• tamarind seed gum for example, commercially available products such as "Glyloid 6C (registered trademark)", “Glyate (registered trademark)”, “Glyloid (registered trademark) 3S”, “Glyloid (registered trademark) 2A” (manufactured by MP Gokyo Food & Chemical Co., Ltd.), and "TG120” (manufactured by Mitsubishi Chemical Co., Ltd.) may be used.
• Locust bean gum is a polysaccharide obtained from the seeds of carob (Celatonia siliqua) and has a structure in which mannose is the main chain and galactose is bonded to the side chain.
• locust bean gum commercially available products such as "Soalocust A120", “Soalocust A200”, and “MC1000” (manufactured by Mitsubishi Chemical Corporation) and GRINSTED LBG 860 (manufactured by Sansho Co., Ltd.) may be used.
• Tara gum is a polysaccharide obtained from the seeds of tara (Caesalpinia spinosa) and has a structure in which mannose is the main chain and galactose is bonded to the side chain.
• tara gum commercially available products such as "MT120” and “MT1000” (manufactured by Mitsubishi Chemical Corporation) and Spinogum D (manufactured by Sansho Co., Ltd.) may be used.
• polysaccharide A include, for example, anionized products obtained by introducing a carboxymethyl group or the like, and their sodium salts, potassium salts, and calcium salts; anionized products obtained by introducing a quaternary ammonium group or the like, and their chlorides; etherified products obtained by ethylene oxide or propylene oxide; enzyme-treated products; and acid hydrolysates.
• Polysaccharide A may be used alone or in combination of two or more types.
• the number average molecular weight (sometimes referred to as Mn) of polysaccharide A is preferably 5k to 50,000 kDa, more preferably 7k to 10,000 kDa, even more preferably 10k to 5,000 kDa, and may be, for example, 10k to 3,000 kDa, 15k to 1000 kDa, or 20 to 700 kDa.
• the weight average molecular weight (sometimes referred to as Mw) of polysaccharide A is preferably 5k to 150,000 kDa, more preferably 10k to 50,000 kDa, and even more preferably 20k to 30,000 kDa, and may be, for example, 30k to 10,000 kDa, 50k to 7,000 kDa, or 70k to 5,000 kDa.
• Mn and/or Mw of polysaccharide A is within the above range, the solubility and mechanical strength of the pouch at low temperatures can be improved.
• the Mn of polysaccharide A is the weighted average of the Mn of the two or more polysaccharides. The same applies to Mw.
• the Mn of the tamarind seed gum is preferably 10k to 3,000kDa, more preferably 30k to 1,000kDa, even more preferably 50k to 500kDa, for example 100k to 500kDa.
• the Mw of the tamarind seed gum is preferably 10k to 50,000kDa, more preferably 30k to 10,000kDa, even more preferably 50k to 5,000kDa, for example 500k to 4,500kDa or 1,000k to 4,000kDa.
• the Mn of the locust bean gum is preferably 5k to 50,000 kDa, more preferably 7k to 10,000 kDa, even more preferably 10k to 5,000 kDa, and may be, for example, 15 to 1,000 kDa or 20 to 300 kDa.
• the Mw of the locust bean gum is preferably 5k to 150,000 kDa, more preferably 10k to 30,000 kDa, and even more preferably 15k to 15,000 kDa, and may be, for example, 20k to 5,000 kDa, 30k to 1,000 kDa, or 50k to 500 kDa.
• the Mn of tara gum is preferably 5k to 10,000 kDa, more preferably 7k to 5,000 kDa, and even more preferably 10k to 1,000 kDa, and the Mw of tara gum is preferably 5k to 30,000 kDa, more preferably 10k to 15,000 kDa, and even more preferably 15k to 10,000 kDa.
• the Mn and/or Mw of each polysaccharide is within the above range, the solubility at low temperature and the mechanical strength of the pouch can be improved.
• polysaccharide A may contain the same type of polysaccharides having different Mn and/or Mw.
• the Mn and Mw of the polysaccharide A can be determined by gel filtration HPLC, for example, by the method described in the Examples below.
• polysaccharides A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum and their derivatives is excellent in both solubility at low temperatures and mechanical strength.
• these polysaccharides A have a structure with steric hindrance in the side chain, which makes it easy to suppress crystallization and is advantageous in terms of water solubility, and that they can form a high-order network through intermolecular interactions and hydrogen bonds, which makes it easy to increase mechanical strength.
• these polysaccharides A have high heat resistance, acid resistance, and salt resistance, so there is little molecular weight reduction due to heating and dissolving during film production, and there is little change in physical properties even when they come into contact with liquids containing acids or salts, making them suitable for use in pouches.
• they are highly resistant to enzymes such as amylase, making them suitable for use in detergent pouches containing enzymes, for example.
• the content of the polysaccharide A may be, for example, 0.1 to 100 mass%, 1 to 95 mass%, or 3 to 90 mass%, and is preferably 5 to 80 mass%, more preferably 10 to 70 mass%, even more preferably 20 to 60 mass%, even more preferably 25 mass% or more and less than 60 mass%, particularly preferably 30 to 58 mass%, especially more preferably 32 to 55 mass%, and especially even more preferably 35 to 50 mass% or 37 to 48 mass%, relative to the mass of the water-soluble film.
• the content of polysaccharide A is within the above range, the pouch has excellent solubility and mechanical strength at low temperatures.
• the polysaccharide A is preferably selected from tamarind seed gum and its derivatives.
• the pouch has better solubility at low temperatures and mechanical strength.
• the polysaccharide A is preferably selected from the group consisting of tamarind seed gum, sodium salts or potassium salts of anionized forms of tamarind seed gum, and enzyme-treated products of tamarind seed gum.
• the water-soluble film further contains a plasticizer.
• the processability can be improved, such as facilitating film formation and pouching.
• the plasticizer used in the pouch of the present invention is preferably at least one selected from the group consisting of polyhydric alcohols, hydroxy acids, monosaccharides, and disaccharides. These compounds can aggregate polysaccharide A by dehydration.
• a high-order network can be formed by hydrogen bonding with polysaccharide A, in addition to improving the processability, the mechanical strength of the pouch, particularly the elongation, can be further increased.
• the plasticizer may be used alone or in combination of two or more kinds.
• polyhydric alcohol examples include glycerin, diglycerin, sorbitol, alkylene glycols (e.g., alkylene glycols having 2 to 10 carbon atoms, such as ethylene glycol, propylene glycol, and neopentyl glycol), polyalkylene glycols (e.g., diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycols having a molecular weight of up to 400, and polypropylene glycols having a molecular weight of up to 400), trimethylolpropane, erythritol, xylitol, 2-methyl-1,3-propanediol, maltitol, mannitol, and pentaerythritol.
• alkylene glycols e.g., alkylene glycols having 2 to 10 carbon atoms, such as ethylene glycol, propylene glycol, and neopentyl glycol
• hydroxy acids examples include lactic acid, glycolic acid, malic acid, and tartaric acid.
• the monosaccharides include glucose, mannose, galactose, fructose, xylose, etc.
• the disaccharides include maltose, trehalose, sucrose, lactose, etc.
• the plasticizer is preferably at least one selected from the group consisting of glycerin, diglycerin, sorbitol, alkylene glycol, neopentyl glycol, trimethylolpropane, erythritol, 2-methyl-1,3-propanediol, lactic acid, glucose, fructose, maltose, and trehalose, and more preferably at least one selected from the group consisting of glycerin, ethylene glycol, sorbitol, and fructose.
• the content of the plasticizer may be, for example, 0 to 99.9 mass%, 5 to 99 mass%, or 10 to 95 mass% relative to the mass of the water-soluble film, and is preferably 20 to 95 mass%, more preferably 30 to 90 mass%, even more preferably 40 to 80 mass%, even more preferably more than 40 mass% and not more than 75 mass%, particularly preferably 42 to 70 mass%, especially more preferably 45 to 68 mass%, and especially even more preferably 50 to 65 mass% or 52 to 63 mass%. If the content of the plasticizer is within the above range, the processability of the film and the mechanical strength of the pouch can be excellent.
• the content ratio (mass ratio) of polysaccharide A to plasticizer is preferably 10:90 to 90:10, more preferably 20:80 to 80:20, even more preferably 30:70 to 70:30, even more preferably 35:65 to 65:35, particularly preferably 36:64 to 60:40, or 37:63 to 58:42, particularly preferably 38:62 to 55:45, and extremely preferably 39:61 to 52:48, or 40:60 to 50:50.
• the content ratio of polysaccharide A to plasticizer is within the above range, the water solubility, mechanical strength, and low-temperature solubility of the water-soluble film can be improved.
• the content ratio (mass ratio) of polysaccharide A and polysaccharide B to the plasticizer is preferably within the above range.
• the water-soluble film in the pouch of the present invention, it is preferable that the water-soluble film further contains a polysaccharide B different from the polysaccharide A.
• a higher-order network can be formed by hydrogen bonding with polysaccharide A, and the mechanical strength of the pouch can be further improved.
• the polysaccharide B is at least one selected from the group consisting of guar gum, locust bean gum, xanthan gum, carrageenan, alginic acid, pullulan, and derivatives thereof.
• Guar gum is a polysaccharide obtained from the endosperm of guar beans (Cyamopsis tetragonoloba), and has a structure in which mannose is the main chain and galactose is bonded to the side chain.
• guar gum for example, commercially available products such as "Guapac (registered trademark)” (manufactured by MP Gokyo Food & Chemical Co., Ltd.), “RG100” (manufactured by Mitsubishi Chemical Co., Ltd.), “JAGUAR C 17K” (manufactured by Sansho Co., Ltd., cationized guar gum), and “MEYPRO-BOND 111” (manufactured by Sansho Co., Ltd., cationized guar gum) may be used.
• “Guapac (registered trademark)” manufactured by MP Gokyo Food & Chemical Co., Ltd.
• RG100 manufactured by Mitsubishi Chemical Co., Ltd.
• “JAGUAR C 17K” manufactured by Sansho Co., Ltd., cationized guar gum
• MEYPRO-BOND 111 manufactured by Sansho Co., Ltd., cationized guar gum
• Xanthan gum is a polysaccharide made by fermenting starch with the bacterium Xanthomonas campestris, with a glucose backbone and a side chain containing one glucuronic acid between two mannose units.
• Commercially available xanthan gum products such as "Echo Gum (registered trademark)” (manufactured by MP Gokyo Food & Chemical Co., Ltd.), “Soaxan” and “XG800” (manufactured by Mitsubishi Chemical Co., Ltd.) may be used.
• Carrageenan is a polysaccharide obtained from red algae, and has repeating units of D-galactose or 3,6-anhydro-D-galactose, and also has sulfate groups. Carrageenan is classified into ⁇ (kappa) carrageenan, ⁇ (iota) carrageenan, and ⁇ (lambda) carrageenan. These can be used alone or in combination of two or more.
• carrageenan for example, commercially available products such as “GENUGEL carrageenan type JPE-126” (manufactured by Sansho Co., Ltd.), “GENUTINE VCS-J” (manufactured by Sansho Co., Ltd.), “MW210", “MV320”, and “MW952” (manufactured by Mitsubishi Chemical Corporation) may be used.
• derivatives of polysaccharide B include sodium salts, potassium salts, calcium salts, cationized forms and their salts, anionized forms and their salts, enzyme-treated products, acid hydrolysates, etc.
• Polysaccharide B may be used alone or in combination of two or more types.
• the number average molecular weight (sometimes referred to as Mn) of polysaccharide B is preferably 5k to 50,000 kDa, more preferably 10k to 10,000 kDa, even more preferably 10k to 5,000 kDa, and may be, for example, 5k to 1000 kDa, 10k to 500 kDa, or 15 to 200 kDa.
• the weight average molecular weight (sometimes referred to as Mw) of polysaccharide B is preferably 5k to 150,000 kDa, more preferably 10k to 50,000 kDa, and even more preferably 10k to 30,000 kDa, and may be, for example, 10k to 5,000 kDa, 30k to 2,000 kDa, or 50k to 1,000 kDa.
• Mw weight average molecular weight
• the Mn of the guar gum is preferably 5k to 20,000 kDa, more preferably 5 to 10,000 kDa, even more preferably 7k to 5,000 kDa, such as 10k to 1,000 kDa or 15k to 100 kDa.
• the Mw of the guar gum is preferably 5k to 100,000 kDa, more preferably 5k to 50,000 kDa, even more preferably 7k to 20,000 kDa, such as 10k to 5,000 kDa, 30k to 1,000 kDa, or 50k to 500 kDa.
• the Mn of xanthan gum is preferably 5k to 50,000 kDa, more preferably 7k to 10,000 kDa, even more preferably 10k to 5,000 kDa, such as 10k to 1,000 kDa or 15k to 100 kDa.
• the Mw of xanthan gum is preferably 5k to 150,000 kDa, more preferably 7k to 50,000 kDa, even more preferably 10k to 30,000 kDa, such as 10k to 5,000 kDa, 30k to 1,000 kDa, or 50k to 500 kDa.
• the Mn of the alginic acid is preferably 5k to 50,000 kDa, more preferably 7k to 10,000 kDa, even more preferably 10k to 5,000 kDa, and may be, for example, 15 to 1,000 kDa or 20 to 300 kDa.
• the Mw of the alginic acid is preferably 5k to 150,000 kDa, more preferably 10k to 30,000 kDa, and even more preferably 15k to 15,000 kDa, and may be, for example, 20k to 5,000 kDa, 30k to 1,000 kDa, or 50k to 500 kDa.
• polysaccharide B may contain the same type of polysaccharides having different Mn and/or Mw.
• the Mn and Mw of the polysaccharide B can be determined by gel filtration HPLC, for example, by the method described in the Examples below.
• the polysaccharide A is selected from tamarind seed gum or a derivative thereof, and the polysaccharide B is at least one selected from the group consisting of xanthan gum, guar gum, and locust bean gum.
• a water-soluble film tends to improve the mechanical strength of the pouch while maintaining its solubility at low temperatures.
• the content of the polysaccharide B is preferably 1 to 30% by mass, more preferably 1.5 to 20% by mass, even more preferably 2 to 10% by mass, even more preferably 2.5 to 7% by mass, and particularly preferably 3 to 5% by mass, relative to the mass of the water-soluble film. If the content of polysaccharide B is within the above range, the pouch can have excellent solubility and mechanical strength at low temperatures.
• the content ratio (mass ratio) of polysaccharide A to polysaccharide B is preferably 99:1 to 50:50, more preferably 98:2 to 55:45, even more preferably 95:5 to 60:40, 93:7 to 70:30, or 92:8 to 65:35, and even more preferably 91:9 to 70:30.
• the content ratio of polysaccharide A to polysaccharide B is within the above range, the water solubility of the water-soluble film can be maintained while the mechanical strength and processability can be further improved.
• the water-soluble film may contain a plasticizer and an additive other than polysaccharide B (also referred to as additive A) to the extent that the effect of the present invention is not hindered.
• additive A include dispersants, moisture, antioxidants, UV absorbers, lubricants, colorants, preservatives, fillers, surfactants, anti-sticking agents, release agents, pigments, crosslinking agents, etc.
• Additive A may be used alone or in combination of two or more.
• the plasticizer, polysaccharide B, and additive A may be collectively referred to simply as "additives”.
• filler refers to a component that is not compatible with polysaccharide A.
• a pouch when the water-soluble film contains a filler, it can form a higher-order network by hydrogen bonding with polysaccharide A, which can improve the stress of the resulting pouch.
• adding a filler to the coating agent increases the solids concentration, allowing the thickness of the coating film to be increased.
• Fillers include, for example, inorganic pigments such as kaolin, clay, engineered kaolin, delaminated clay, heavy calcium carbonate, light calcium carbonate, mica (swelling mica, synthetic mica, white mica (muscovite), sericite, gold mica (phlocopite), black mica (biotite), fluorine gold mica (artificial mica), red mica, soda mica, vanadium mica, illite, tin mica, paragonite, brittle mica, etc.), talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicates, bentonite (montmorillonite, beidellite, saponite, stevensite, hectorite, etc.), colloidal silica, and satin white, as well as organic pigments such as solid, hollow, and core-shell types. Fillers may be used alone or in combination of two or more.
• inorganic pigments such as kaolin, clay, engineered ka
• the total content of the filler relative to the mass of the water-soluble film is preferably 0.1 to 50 mass%, more preferably 0.5 to 35 mass%, even more preferably 1 to 30 mass%, even more preferably 1.5 to 20 mass%, even more preferably 2 to 18 mass%, even more preferably 2 to 15 mass%, even more preferably 2 to 10 mass%, and particularly preferably 2 to 6 mass%, from the viewpoint of improving the stress of the resulting pouch.
• the coating film is preferably 1 to 90 mass%, more preferably 5 to 80 mass%, even more preferably 10 to 75 mass%, even more preferably 20 to 70 mass%, even more preferably 30 to 65 mass%, even more preferably 40 to 60 mass%, even more preferably 42 to 58 mass%, and particularly preferably 45 to 55 mass%.
• a dispersant may be added separately to the coating agent for producing the water-soluble film in the pouch, which can improve the dispersibility of the filler.
• the dispersant is preferably a cationic polymer, and examples thereof include polyalkylene polyamines, polyamide compounds, polyamidoamine-epihalohydrin or formaldehyde condensation reaction products, polyamine-epihalohydrin or formaldehyde condensation reaction products, polyamide polyurea-epihalohydrin or formaldehyde condensation reaction products, polyamine polyurea-epihalohydrin or formaldehyde condensation reaction products, polyamidoamine polyurea-epihalohydrin or formaldehyde condensation reaction products, polyamide polyurea compounds, polyamine polyurea compounds, polyamidoamine polyurea compounds, polyamidoamine compounds, polyethyleneimine, polyvinylpyridine, amino-modified acrylamide compounds, polyvinylamine, polydiallyldimethylammonium chloride,
• the dispersants may be used alone or in combination of two or more.
• the content of the dispersant is preferably 0.01 to 20 mass %, more preferably 0.1 to 10 mass %, and even more preferably 1 to 5 mass %, relative to the mass of the water-soluble film.
• Crosslinking agents include, for example, tannic acid and its salts, tannins other than tannic acid, catechin, anthocyanin, gallic acid and its salts, phenols, hydroquinone, etc.
• the content of additive A is not particularly limited as long as it does not interfere with the effects of the present invention, but is, for example, about 0 to 10% by mass, preferably 0.001 to 10% by mass, more preferably 0.01 to 5% by mass, and even more preferably about 0.1 to 1% by mass, relative to the mass of the water-soluble film.
• the content of the polyvinyl alcohol-based resin in the water-soluble film of the pouch of the present invention is preferably less than 30% by mass, more preferably 20% by mass or less, even more preferably 10% by mass or less, even more preferably 5% by mass or less, particularly preferably 1% by mass or less, especially preferably 0.1% by mass, and may be 0% by mass. That is, it is preferably 0 to less than 30% by mass, more preferably 0 to 20% by mass, even more preferably 0 to 10% by mass, even more preferably 0 to 5% by mass, especially preferably 0 to 1% by mass, especially preferably 0 to 0.1% by mass.
• the polyvinyl alcohol-based resin used in the present invention can be made from vinyl acetate made of petroleum-derived carbon, vinyl acetate made of biomass-derived carbon, or a mixture thereof. Also, a polyvinyl alcohol-based resin whose apparent biomass ratio has been changed by the mass balance method may be used.
• the total content of polysaccharide A, plasticizer, and polysaccharide B contained in the water-soluble film is preferably 30% by mass or more, more preferably 50% by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, particularly preferably 90% by mass or more, particularly more preferably 95% by mass or more, particularly more preferably 98% by mass or more, and may be 100% by mass, based on the mass of the water-soluble film.
• the water-soluble film is preferably 30 to 100% by mass, more preferably 50 to 100% by mass, even more preferably 70 to 100% by mass, even more preferably 80 to 100% by mass, particularly preferably 90 to 100% by mass, particularly more preferably 95 to 100% by mass, and particularly more preferably 98 to 100% by mass.
• the solubility and mechanical strength of the pouch at low temperatures can be further increased.
• the above total content also includes the case where the plasticizer and/or polysaccharide B is 0% by mass.
• the pouch of the present invention comprises a water-soluble film.
• water-soluble means that it is soluble in water, and preferably means that the solubility in 90°C hot water is 90% by mass or more. That is, when a water-soluble film is added to 90°C hot water and the film is stirred for 5 minutes to dissolve, and the amount of solids that do not pass through a filter (21 ⁇ m) is 10% by mass or less, it can be evaluated as water-soluble.
• the mass of the water-soluble film to be dissolved in 90°C hot water is 0.1 parts by mass relative to 100 parts by mass of 90°C hot water.
• solubility of the water-soluble film in 90°C hot water is 90% by mass or more, preferably 95% by mass or more, more preferably 98% by mass or more, residues are unlikely to remain when a pouch containing the film is used.
• the upper limit of the solubility of the water-soluble film is 100% by mass. That is, the solubility of the water-soluble film is 90 to 100% by mass, preferably 95 to 100% by mass, more preferably 98 to 100% by mass.
• the solubility of the water-soluble film can be adjusted to be equal to or higher than the above lower limit, for example, by appropriately adjusting the type and/or amount of components (eg, additives) contained in the water-soluble film.
• the water-soluble film can be dissolved in water at 10°C preferably within 1000 seconds. That is, when a water-soluble film having a length of 30 mm, a width of 40 mm, and a thickness of 50 ⁇ m is immersed in 500 mL of water at 10°C, the time required for complete dissolution is preferably within 1000 seconds, more preferably within 700 seconds, even more preferably within 600 seconds, and even more preferably within 500 seconds, and may be, for example, within 300 seconds or within 180 seconds. If the time for complete dissolution of the water-soluble film in water at 10°C is below the upper limit, it is preferable because the contents are released quickly when a pouch containing the film is dissolved in cold water and used.
• the lower limit of the time for complete dissolution is not particularly limited, and the shorter the time required for complete dissolution, the better.
• the time for complete dissolution of the water-soluble film in water at 10°C can be adjusted to below the upper limit by, for example, appropriately adjusting the type and/or amount of components contained in the water-soluble film; the manufacturing conditions of the water-soluble film (drying conditions, etc.); etc.
• the time required for complete dissolution in water at 10°C can be determined, for example, by the method described in the Examples below.
• the thickness of the water-soluble film is preferably 1 to 500 ⁇ m, more preferably 5 to 300 ⁇ m, and even more preferably 10 to 100 ⁇ m. If the thickness of the water-soluble film is within the above range, the pouch can have good solubility at low temperatures and good mechanical strength.
• the thickness of the water-soluble film can be determined, for example, using a thickness meter, and can be determined by the method described in the examples below.
• the maximum stress of the water-soluble film is preferably 5 MPa or more, more preferably 10 MPa or more, even more preferably 20 MPa or more, even more preferably 25 MPa or more, and particularly preferably 30 MPa or more, and may be, for example, 35 MPa, 40 MPa, 45 MPa or 50 MPa or more. If the maximum stress of the water-soluble film is equal to or greater than the above lower limit, the mechanical strength of the pouch containing the water-soluble film can be improved.
• the upper limit of the maximum stress of the water-soluble film is usually 150 MPa or less, preferably 140 MPa or less.
• the preferred ranges are 5 to 150 MPa, 10 to 150 MPa, 20 to 150 MPa, 25 to 150 MPa, 30 to 150 MPa, 35 to 150 MPa, 40 to 150 MPa, 45 to 150 MPa, or 50 to 140 MPa.
• the maximum stress of the water-soluble film can be adjusted to be equal to or greater than the lower limit by, for example, appropriately adjusting the type and/or amount of components contained in the water-soluble film; the manufacturing conditions of the water-soluble film (for example, drying temperature and/or time); etc.
• the breaking elongation of the water-soluble film is preferably 10% or more, more preferably 25% or more, even more preferably 35% or more, even more preferably 40% or more, particularly preferably 50% or more, especially more preferably 70% or more, especially even more preferably 75% or more, and extremely preferably 80% or more or 85% or more. If the breaking elongation of the water-soluble film is equal to or greater than the lower limit, the mechanical strength of the pouch containing the water-soluble film can be improved.
• the upper limit of the breaking elongation of the water-soluble film is usually 150% or less, preferably 140% or less.
• the preferred ranges are 10-150%, 25-150%, 35-150%, 40-150%, 50-150%, 70-150%, 75-150%, 80-150%, or 85-140%.
• the breaking elongation of the water-soluble film can be adjusted to above the lower limit by, for example, appropriately adjusting the type and/or amount of the components contained in the water-soluble film; the manufacturing conditions of the water-soluble film (for example, the drying temperature and/or time); etc.
• the maximum stress and breaking elongation of the water-soluble film can be determined by a tensile test, for example, by the method described in the Examples below.
• the toughness of the water-soluble film is preferably 400 or more, more preferably 900 or more, even more preferably 1100 or more, even more preferably 1200 or more, particularly preferably 1300 or more, especially more preferably 1400 or more, especially even more preferably 1500 or more, and extremely preferably 1600 or more, for example 1700 or more, 1800 or more, 1900 or more, or 2000 or more. If the toughness of the water-soluble film is above the lower limit, the mechanical strength of a pouch containing the water-soluble film can be improved. The upper limit of the toughness is usually 3000 or less.
• the preferred ranges are 400 to 3000, 900 to 3000, 1100 to 3000, 1200 to 3000, 1300 to 3000, 1400 to 3000, 1500 to 3000, 1600 to 3000, 1700 to 3000, 1800 to 3000, 1900 to 3000, or 2000 to 3000.
• the toughness of the water-soluble film can be determined by the maximum stress in a tensile test times the breaking elongation.
• the water-soluble film has excellent homogeneity without bleeding out of the plasticizer.
• the surface of the water-soluble film may be flat, or one or both sides of the water-soluble film may be provided with a textured finish such as an embossed or uneven pattern in order to prevent products from sticking together.
• a textured finish such as an embossed or uneven pattern in order to prevent products from sticking together.
• the method for producing the water-soluble film used in the pouch of the present invention is not particularly limited, and the film can be produced by any method known in the art.
• the water-soluble film is, for example, (1) A step of obtaining a coating liquid (coating agent) by stirring at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof, a solvent, and optionally an additive at a predetermined temperature; (2) forming a coating film; and (3) drying the coating film to form a dry coating film.
• the solids concentration of the coating liquid is preferably 1 to 15% by mass, and more preferably 2 to 10% by mass.
• the solids concentration indicates the total mass of components other than the solvent (e.g., polysaccharide A, additives, etc.) relative to the mass of the coating liquid.
• the temperature at which polysaccharide A and, optionally, additives and a solvent are stirred is usually 15 to 100°C, preferably 30 to 98°C. There are no particular limitations on the stirring method, and stirring can be carried out by any conventionally known method.
• the solvent is not particularly limited, but water, ethanol, methanol, 1-propanol, 2-propanol, etc. are preferred because they easily dissolve polysaccharide A and are easy to dry afterwards.
• the coating film can be formed, for example, by applying a coating liquid onto a substrate.
• substrates include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; fluororesins such as Teflon (registered trademark); and metal plates.
• Methods for applying the coating liquid to a substrate include known methods such as spin coating, extrusion, bar coating, and applicator methods.
• Coaters that can be used include blade coaters, bar coaters, roll coaters, gravure coaters, reverse gravure coaters, comma coaters, air knife coaters, reverse roll coaters, curtain coaters, spray coaters, size press coaters, and gate roll coaters.
• the solvent is then removed by drying or the like to form a dry coating film.
• the drying method include natural drying, ventilation drying, heat drying, and reduced pressure drying.
• a conventional dryer can be used, and examples thereof include a steam heater, a gas heater, an infrared heater, an electric heater, a hot air heater, a microwave, and a cylinder dryer.
• the dried coating is a water-soluble film.
• a water-soluble film can be produced by a melt extrusion film-making method, in which a film-making stock solution obtained using an extruder or the like is extruded through a T-die or the like to produce a film, or an inflation molding method.
• the substrate After forming the water-soluble film on the substrate, the substrate can be removed to obtain the water-soluble film.
• the substrate may also be used as is without being peeled off. When the substrate is not peeled off, a laminate containing the substrate (support) and the water-soluble film can be obtained. When peeling off, it is preferable that a release agent is applied to the coating surface.
• the present invention also encompasses a laminate comprising a water-soluble film containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof, and a support.
• the support is preferably paper or a film.
• the laminate of the present invention in such an embodiment contains a specific polysaccharide A, and therefore has excellent solubility at low temperatures and mechanical strength.
• support film paper or film
• the support is paper
• examples of the paper include kraft paper, one-sided glossy kraft paper, one-sided glossy bleached kraft paper, bleached kraft paper, unbleached kraft paper, fine paper, medium quality paper, coated paper, one-sided glossy paper, imitation paper, glassine paper, graphene paper, parchment paper, synthetic paper, white cardboard, Manila cardboard, milk carton base paper, cup base paper, ivory paper, white silver paper, tissue paper, paperboard, rayon paper, wax paper, liner paper, and the like.
• the basis weight of the paper is preferably 20 to 400 g/m 2 , and more preferably 25 to 150 g/m 2.
• the basis weight of the paper is more preferably 30 to 100 g/m 2 , and even more preferably 40 to 70 g/m 2.
• the basis weight of the paper is measured in accordance with JIS P 8124:2011.
• the above-mentioned paper can generally be produced by papermaking a stock containing pulp, a filler and various auxiliary agents.
• pulp include chemical pulps such as bleached hardwood kraft pulp (LBKP), bleached softwood kraft pulp (NBKP), unbleached hardwood kraft pulp (LUKP), unbleached softwood pulp (NUKP) and sulfite pulp; mechanical pulps such as stone grind pulp and thermomechanical pulp; wood fibers such as deinked pulp and waste paper pulp; and non-wood fibers obtained from kenaf, bamboo, hemp and the like. These can be used alone or in combination of two or more.
• chemical pulp of wood fiber and mechanical pulp are preferably used, and chemical pulp is more preferably used, from the viewpoints of reducing the possibility of foreign matter being mixed into the base paper and the possibility of discoloration over time when recycled after use, and of realizing good printing due to high whiteness and increasing the value of use (especially when used as a packaging material).
• Materials other than pulp can also be used as the secondary paper material as long as they do not impair the effects of the present invention. Examples of such materials include synthetic fibers such as rayon fibers and nylon fibers.
• Examples of the filler include white carbon, talc, kaolin, clay, heavy calcium carbonate, light calcium carbonate, titanium oxide, zeolite, synthetic resin fillers, etc. These may be used alone or in combination of two or more.
• examples of various auxiliaries include aluminum sulfate, various anionic, cationic, nonionic or amphoteric retention aids, drainage aids, paper strength agents, internal sizing agents, etc., which can be used alone or in combination of two or more.
• dyes, fluorescent whitening agents, pH adjusters, defoamers, pitch control agents, slime control agents, and additives consisting of two or more of these can also be used.
• the method for producing the paper is not particularly limited, and the paper can be produced, for example, according to the following procedure.
• the pulp slurry is mixed with the filler and various auxiliaries to prepare a stock.
• the pulp slurry can be prepared by beating the pulp in the presence of water.
• the method and device for beating the pulp are not particularly limited, and a known method and device for beating can be used.
• the content of the pulp in the stock is not particularly limited. For example, it is 60% by mass or more and less than 100% by mass with respect to the total mass of the stock.
• the prepared paper stock is then made into paper by an acidic, neutral or alkaline papermaking method using a known Fourdrinier former, on-top hybrid former, gap former machine or the like.
• multiple sheets of the wet paper obtained are stacked as necessary, and one or more sheets of the wet paper are pressed and dried to obtain paper.
• a single-layer paper is obtained, and if multiple wet papers are stacked, a multi-layer paper is obtained.
• an adhesive may be applied to the surface of the wet paper (the surface on which other wet papers are stacked).
• the paper may have a surface treated with various chemicals.
• chemicals that can be used include oxidized starch, hydroxyethyl etherified starch, enzyme-modified starch, polyacrylamide, polyvinyl alcohol, surface sizing agents, water-resistant agents, water retention agents, thickeners, lubricants, etc. These can be used alone or in combination of two or more. Furthermore, these various chemicals may be used in combination with pigments.
• pigments include inorganic pigments such as kaolin, clay, engineered kaolin, delaminated clay, heavy calcium carbonate, light calcium carbonate, mica, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicates, colloidal silica, and satin white, as well as organic pigments such as solid, hollow, or core-shell types, which can be used alone or in combination of two or more.
• inorganic pigments such as kaolin, clay, engineered kaolin, delaminated clay, heavy calcium carbonate, light calcium carbonate, mica, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicates, colloidal silica, and satin white
• organic pigments such as solid, hollow, or core-shell types, which can be used alone or in combination of two or more.
• the method for treating the paper surface is not particularly limited.
• the paper can be treated using a known coating device such as a rod metering size press, a pond type size press, a gate roll coater, a spray coater, a blade coater, or a curtain coater.
• the film When the support is a film, examples of the film include films (polyolefin films such as polyethylene, polypropylene, and norbornene-based polymers; polyvinyl alcohol films; polyethylene terephthalate (PET) films; poly(meth)acrylic acid ester films; cellulose ester films such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; polylactic acid films; ethylene-vinyl alcohol copolymer films, etc.), sheets, etc.
• films polyolefin films such as polyethylene, polypropylene, and norbornene-based polymers
• polyvinyl alcohol films polyethylene terephthalate (PET) films
• PET poly(meth)acrylic acid ester films
• cellulose ester films such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate
• polylactic acid films ethylene-vinyl alcohol copolymer films, etc.
• the average thickness of the paper or film used as the support is, for example, about 1 to 500 ⁇ m, or about 10 to 300 ⁇ m.
• the water-soluble film may be a single layer or multiple layers.
• the layers may be the same or different from each other.
• the laminate may also include any layer.
• the laminate may have one or more layers selected from the group consisting of a barrier layer, a protective layer, and a heat seal layer as an optional layer at any location in the layer structure.
• a protective layer and/or a heat seal layer it is preferable that the layer is disposed as the outermost layer of the laminate.
• the barrier layer may be a gas barrier layer or a water vapor barrier layer, and such barrier layers are known in the art.
• barrier layers include resin layers and metal foils, and more specific examples include resin layers containing polyvinyl alcohol, ethylene-vinyl alcohol copolymers and/or polyvinylidene chloride, layers containing polysaccharide A but not corresponding to the water-soluble film of the present invention, aluminum foils, aluminum vapor deposition films (aluminum vapor deposition on a substrate such as polyethylene, polypropylene, nylon, polyethylene terephthalate, ethylene-vinyl alcohol copolymer, etc.), alumina vapor deposition films (alumina vapor deposition on a substrate such as polyethylene, polypropylene, nylon, polyethylene terephthalate, ethylene-vinyl alcohol copolymer, etc.), and silica vapor deposition films (silica vapor deposition on a substrate such as polyethylene, polypropylene, nylon, polyethylene terephthalate
• the protective layer is a layer that, by being present as at least a part of the outermost layer of the laminate, can reduce the influence of the surrounding environment on the components present below the protective layer (deterioration of the components). Therefore, the protective layer may have one or more functions selected from the group consisting of barrier properties, oil resistance, solvent resistance, heat resistance, abrasion resistance, impact resistance, weather resistance, and light resistance. By covering the entire outermost layer of the laminate with the protective layer, the above functions can be more effectively exerted. Examples of the protective layer include a resin layer, a paper layer, and a metal foil.
• the heat seal layer may be any layer known in the art.
• the heat seal layer is preferably a resin layer having heat sealability.
• the heat seal layer preferably contains a water-dispersible resin and, optionally, an additive.
• the water-dispersible resin include polyolefin resins, styrene/acrylic copolymers, acrylic resins such as ethylene-(meth)acrylic acid copolymers, ethylene-vinyl acetate copolymers, polyester resins, rubber-based resins, urethane resins, polyamide resins, and combinations thereof.
• the optional additives include lubricants such as paraffin wax, carnauba wax, and polyolefin wax, pigments such as silica and kaolin, and combinations thereof.
• the heat seal layer may have a barrier property, in which case the layer can function as both a heat seal layer and a barrier layer. When the support is a film having barrier or protective properties, the film can also function as a barrier or protective layer.
• Specific layer configurations of the laminate of the present invention which includes a water-soluble film and a support and may have any layer (barrier layer, protective layer, heat seal layer), include, for example, the following configurations. Note that the following configurations are described starting from the layer that will be the outermost layer (the layer on the opposite side to the layer that comes into contact with the contents) when used as a packaging material.
• Water-soluble film/paper or support film or metal foil gas barrier layer or water vapor barrier layer/water-soluble film/paper or support film or metal foil, Water vapor barrier layer/gas barrier layer/water-soluble film/paper or support film or metal foil, Gas barrier layer/water vapor barrier layer/water-soluble film/paper or support film or metal foil, Protective layer/water-soluble film/paper or support film or metal foil, protective layer/gas barrier layer or water vapor barrier layer/water-soluble film/paper or support film or metal foil, Protective layer/water vapor barrier layer/gas barrier layer/water-soluble film/paper or support film or metal foil, Protective layer/gas barrier layer/water vapor barrier layer/water-soluble film/paper or support film or metal foil, Protective layer/gas barrier layer/water vapor barrier layer/water-soluble film/paper or support film or metal foil, protective layer/water-soluble film/gas barrier layer or water vapor barrier layer/paper or support film or metal foil, protective layer/water-soluble film/gas barrier layer or water vapor barrier layer/paper or support film or
• More specific examples of the layer configuration include the following. Water-soluble film/paper LLDPE/water-soluble film/paper, LLDPE/adhesive layer/water-soluble film/paper, LDPE/water-soluble film/paper, LDPE/adhesive layer/water-soluble film/paper, HDPE/water-soluble film/paper, HDPE/adhesive layer/water-soluble film/paper, CPE (non-oriented polyethylene) / water-soluble film / paper, CPE (non-oriented polyethylene) / adhesive layer / water-soluble film / paper, Polyethylene/water-soluble film/paper formed from polyethylene emulsion; Polyethylene formed from polyethylene emulsion/adhesive layer/water-soluble film/paper, Uniaxially oriented polyethylene/water-soluble film/paper, Uniaxially oriented polyethylene/adhesive layer/water-soluble film/paper, Biaxially oriented polyethylene/water-soluble film/paper, Biaxially oriented polyethylene/adhesive
• the method for producing the laminate of the present invention is not particularly limited, and the laminate can be produced by any method known in the art.
• the laminate of the present invention can be produced, for example, by a method including the same steps (1) to (3) as those described in the above-mentioned method for producing a water-soluble film.
• the coating film in the laminate may be a single layer or multiple layers.
• the laminate of the present invention can also be produced by integrating a water-soluble film produced by, for example, a melt extrusion film-forming method in which a film-forming solution (water-soluble film-forming material) obtained using an extruder or the like is extruded through a T-die or the like to form a film, or an inflation molding method, with a support.
• a melt extrusion film-forming method in which a film-forming solution (water-soluble film-forming material) obtained using an extruder or the like is extruded through a T-die or the like to form a film, or an inflation molding method, with a support.
• the integration method is not limited, and examples include a method of applying water to the surface of the water-soluble film and adhering the coated surface to the support, a method of integrating the water-soluble film and the support by thermocompression bonding, a method of integrating the water-soluble film and the support via a pressure-sensitive adhesive or adhesive, and an inflation method in which the water-soluble film-forming material and the material forming the support (film) are co-extruded.
• the films are integrated by thermocompression, the conditions may be appropriately selected depending on the type of polysaccharide contained in the water-soluble film and the type and amount of plasticizer contained, if any.
• the films can be integrated by compression bonding at a temperature of 100 to 200° C.
• the laminate of the present invention can also be produced as a multi-layer laminate by laminating a plurality of water-soluble films obtained by melt extrusion film formation, inflation molding or the like onto a support by a known method.
• the laminate may contain a combination of a water-soluble film produced by coating and a water-soluble film produced by a melt extrusion method, an inflation molding method, or the like.
• the pouch of the present invention comprises the water-soluble film, it has excellent solubility and mechanical strength at low temperature. Therefore, the pouch of the present invention dissolves in water at 10°C preferably within 2000 seconds, more preferably within 1500 seconds, even more preferably within 1000 seconds, even more preferably within 700 seconds, particularly preferably within 600 seconds, and particularly preferably within 500 seconds.
• the lower limit of the dissolution time is not particularly limited, and the shorter the dissolution time, the more preferable it is.
• the solubility of the pouch in water at 10°C can be adjusted to above the lower limit by, for example, appropriately adjusting the type and/or amount of the components (e.g., additives) contained in the water-soluble film constituting the pouch; the manufacturing conditions of the pouch (e.g., the amount of water applied, temperature, and pressure during water sealing, the temperature and pressure during heat sealing), etc.
• the solubility of the pouch in water at 10°C can be determined, for example, by the method described in the Examples below.
• the film contained in the pouch may be a monolayer film or a multilayer film.
• the monolayer film is the water-soluble film.
• the pouch comprises (or is composed of) a multilayer film
• the multilayer film may be a laminate of a plurality of the water-soluble films, or may be a laminate of the water-soluble film and another water-soluble film other than the water-soluble film. From the viewpoint of increasing the solubility and mechanical strength of the pouch at low temperatures, it is preferable that the pouch is composed of a monolayer or multilayer water-soluble film, and further, from the viewpoint of manufacturing efficiency, it is more preferable that the pouch is composed of a monolayer water-soluble film.
• the pouch of the present invention has excellent mechanical strength, and its compressive strength is preferably 50N or more, more preferably 100N or more, even more preferably 200N or more, even more preferably 300N or more, and particularly preferably 400N or more, and may be, for example, 500N, 600N, 700N or 800N or more.
• the upper limit of the compressive strength of the pouch is usually 2000N or less, preferably 1000N or less. That is, the preferred ranges are 50-2000N, 100-2000N, 200-2000N, 300-2000N, 400-2000N, 500-2000N, 600-2000N, 700-2000N, or 800-1000N.
• the compressive strength of the pouch can be adjusted to above the lower limit by, for example, appropriately adjusting the type and/or amount of components contained in the water-soluble film that constitutes the pouch; the manufacturing conditions of the water-soluble film (e.g., drying temperature and/or time); the manufacturing conditions of the pouch (e.g., the amount of water applied, temperature, and pressure during water sealing, and the temperature and pressure during heat sealing).
• the manufacturing conditions of the water-soluble film e.g., drying temperature and/or time
• the manufacturing conditions of the pouch e.g., the amount of water applied, temperature, and pressure during water sealing, and the temperature and pressure during heat sealing.
• the pouch is not particularly limited as long as it is capable of packaging a substance (preferably the contents) and may be sealed or partially open.
• the pouch may be in the form of, for example, a two-sided pouch, a three-sided pouch, a flat pouch, a standing pouch, a gusset pouch, a bottom gusset pouch, a twin pouch, a spout pouch, a side seal pouch, a bottom seal pouch, or in the form of a container, cup, or the like.
• the pouch may be partially open, but is preferably sealed. In such an embodiment, it is more preferable that the pouch contains the contents and is sealed.
• the method for producing the pouch of the present invention from the water-soluble film is not particularly limited, and the pouch can be produced by any method known in the art.
• the pouch of the present invention can be produced, for example, by a method including a step of sealing one or more water-soluble films to form a bag shape.
• a pouch containing a content can be produced, for example, by a method including a step of putting the content into a bag-shaped film and a step of sealing the opening; a step of forming a recess in a first film, a step of putting the content into the recess, and a step of laminating a second film and sealing it.
• Methods for sealing a water-soluble film include a method of sealing by applying water to the film surface and adhering the coated surface (also called water sealing), a method of sealing by thermocompression (also called heat sealing), and a method of sealing with an adhesive.
• the water seal is preferred from the viewpoint of minimizing thermal deterioration of the film.
• the water-soluble film has high adhesive strength due to moisture, and therefore water sealing can be suitably used.
• the water-soluble film has high water sealing properties and low heat sealing properties. Due to the low heat sealing properties, the film is less likely to adhere to the roll when the film is manufactured using a roll-to-roll method, and damage during manufacturing can be effectively suppressed. Furthermore, due to the high water sealing properties, the manufactured water-soluble film can be simply and easily formed into a pouch using moisture.
• the pouch of the present invention is excellent in solubility at low temperature and mechanical strength, and therefore can be suitably used for applications in which it is dissolved in cold water. Therefore, the pouch of the present invention preferably contains at least one selected from the group consisting of a cleaning agent, a fabric softener, and a fragrance.
• a cleaning agent e.g., a cleaning agent for cleaning a cleaning agent for cleaning a cleaning agent for a cleaning a fabric.
• a fragrance e.g., a fragrance
• the contents may be acidic, neutral, or alkaline.
• the form of the contents may be any of powder, lump, gel, and liquid.
• the present invention also encompasses a water-soluble film containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof.
• the water-soluble film of the present invention in this embodiment has excellent solubility at low temperatures and mechanical strength because it contains a specific polysaccharide A, and can also be formed into a pouch having such properties.
• the water-soluble film is similar to the water-soluble film described in the above section [Pouch].
• the present invention also includes a water-soluble film containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof, and a polysaccharide B different from the polysaccharide A.
• the water-soluble film of the present invention contains a specific polysaccharide A and polysaccharide B, and therefore has excellent solubility at low temperatures and mechanical strength, and can also be used to form a pouch having such properties.
• the water-soluble film is preferably similar to the water-soluble film described in the above [Pouch] section, except that it contains the polysaccharide B as an essential component in addition to the polysaccharide A.
• the present invention also includes a water-soluble film used for a pouch, which contains at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof, and a plasticizer, and the content of the plasticizer is 45% by mass or less relative to the mass of the water-soluble film.
• the water-soluble film of the present invention contains at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof, and therefore has excellent solubility at low temperatures and mechanical strength, and can form a pouch having such properties. Furthermore, the water-soluble film is less likely to cause the plasticizer to bleed out onto the film surface.
• the water-soluble film is preferably similar to the water-soluble film described in the above section on [Pouch], except that it contains at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof, and the content of the plasticizer is 45% by mass or less.
• the content of the plasticizer is preferably 40% by mass or less, more preferably 35% by mass or less, and even more preferably 30% by mass or less, relative to the mass of the water-soluble film.
• the lower limit of the plasticizer content is usually 1% by mass or more, more preferably 3% by mass or more, and even more preferably 5% by mass or more. Therefore, the preferred range is 1 to 40% by mass, 3 to 35% by mass, or 5 to 30% by mass.
• the present invention also includes a packaging material comprising a water-soluble film containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof.
• the packaging material of the present invention in such an embodiment contains a specific polysaccharide A, and therefore has excellent solubility and mechanical strength at low temperatures.
• the water-soluble film constituting the packaging material is preferably similar to the water-soluble film described in the above [Pouch] section, and preferably has the same solubility and mechanical strength.
• the packaging material preferably has the same solubility and mechanical strength as the pouch described in the above [Pouch] section.
• the packaging material is a film used for packaging, and may include thin films, thick films, etc., and may be in the form of a container, cup, tube, tray, bottle, etc.
• the packaging material may contain a substance therein, similar to the pouch described above, preferably at least one selected from the group consisting of cleaning agents, fabric softeners, and fragrances.
• Molecular weight of polysaccharides About 20 ⁇ g of each of the polysaccharides used in the examples and comparative examples was subjected to gel filtration HPLC under the following conditions to measure the weight average molecular weight (Mw) and number average molecular weight (Mn).
• the measurement solvent was selected from water or dimethyl sulfoxide (DMSO) in consideration of the solubility of each polysaccharide.
• Example 1 Preparation of Water-Soluble Film ⁇ Example 1> 6 g of tamarind seed gum (weight average molecular weight 3,700 kDa, number average molecular weight 429 kDa; "Glyloid 6C (registered trademark)" MP manufactured by Gokyo Food & Chemical Co., Ltd.) was added to water and heated and stirred at 95°C for 2 hours to obtain an aqueous solution with a concentration of 4%. 4 g of glycerin was added thereto to prepare a coating liquid.
• tamarind seed gum weight average molecular weight 3,700 kDa, number average molecular weight 429 kDa; "Glyloid 6C (registered trademark)" MP manufactured by Gokyo Food & Chemical Co., Ltd.
• the coating liquid was applied onto a polyethylene terephthalate film using a bar coater and dried with hot air at 60°C for 1 hour, and the obtained dried coating film was peeled off from the polyethylene terephthalate film substrate to obtain a film with a thickness of about 50 ⁇ m.
• Examples 2 to 6> A film was obtained in the same manner as in Example 1, except that the amounts of tamarind seed gum and glycerin were changed to those shown in Table 1.
• Example 7 A film was obtained in the same manner as in Example 1, except that sorbitol was added in addition to glycerin when glycerin was added, and each component was added in the amount shown in Table 1.
• Examples 8 to 10> A film was obtained in the same manner as in Example 1, except that when glycerin was added, tannic acid was added in addition to glycerin, and each component was added in the amount shown in Table 1.
• Examples 11 to 14> A film was obtained in the same manner as in Example 1, except that ethylene glycol was added instead of glycerin, and each component was added in the amount shown in Table 1.
• Example 15 to 17> A film was obtained in the same manner as in Example 1, except that fructose was added instead of glycerin, and each component was added in the amount shown in Table 1.
• Example 18 A film was obtained in the same manner as in Example 1, except that when glycerin was added, xanthan gum (weight average molecular weight 92 kDa, number average molecular weight 16 kDa; "Kimika Xanthan PH-R3EC” (Kimika Co., Ltd.) was added in addition to glycerin, and each component was added in the amount shown in Table 1.
• Example 19 A film was obtained in the same manner as in Example 1, except that when glycerin was added, guar gum (weight average molecular weight 93 kDa, number average molecular weight 17 kDa; "SUPERGEL CSA200/50” manufactured by Sansho Co., Ltd.) was added in addition to glycerin, and each component was added in the amount shown in Table 1.
• guar gum weight average molecular weight 93 kDa, number average molecular weight 17 kDa; "SUPERGEL CSA200/50” manufactured by Sansho Co., Ltd.
• Example 20 A film was obtained in the same manner as in Example 1, except that when glycerin was added, locust bean gum (weight average molecular weight 96 kDa, number average molecular weight 26 kDa; "GENU (registered trademark) GUM type RL-200Z” manufactured by Sansho Co., Ltd.) was added in addition to glycerin, and each component was added in the amount shown in Table 1.
• locust bean gum weight average molecular weight 96 kDa, number average molecular weight 26 kDa; "GENU (registered trademark) GUM type RL-200Z” manufactured by Sansho Co., Ltd.
• Example 21 A film was obtained in the same manner as in Example 1, except that when glycerin was added, xanthan gum and guar gum were added in addition to glycerin, and each component was added in the amount shown in Table 1.
• Example 22 A film was obtained in the same manner as in Example 1, except that when glycerin was added, xanthan gum and locust bean gum were added in addition to glycerin in the amounts shown in Table 1.
• Example 23 A film was obtained in the same manner as in Example 17, except that locust bean gum was used instead of tamarind seed gum and glycerin was used instead of fructose.
• Example 1 A film was obtained in the same manner as in Example 3, except that ⁇ -carrageenan (weight average molecular weight 826 kDa, number average molecular weight 48 kDa; "GENUGEL carrageenan type JPE-126" manufactured by Sansho Co., Ltd.) was used instead of tamarind seed gum.
• ⁇ -carrageenan weight average molecular weight 826 kDa, number average molecular weight 48 kDa; "GENUGEL carrageenan type JPE-126" manufactured by Sansho Co., Ltd.
• Example 15 A film was obtained in the same manner as in Example 1, except that nonionic modified starch ("National 208", Ingredion) was used instead of tamarind seed gum, and glycerin was added in the amounts shown in Table 1.
• nonionic modified starch National 208, Ingredion
• the thickness of the film was measured by a micrometer by measuring the thickness at any five or more points of the film and averaging the measured thicknesses.
• ⁇ Film toughness> The films prepared in the examples and comparative examples were stored for 7 days under an environment of 23°C and 50% RH, and then 5 test pieces with a width of 10 mm and a length of 120 mm were cut out. For each test piece, the maximum stress and breaking elongation were measured using an autograph (apparatus name: AG-5000B, Shimadzu Corporation) at a chuck distance of 70 mm and a tensile speed of 500 mm/min, and the average value was calculated. The value of the maximum stress x the breaking elongation was taken as the toughness of the film.
• Example 24 A benchtop pouch molding machine (DD-SR12-1, manufactured by Dada) was used to mold the pouch.
• the film obtained in Example 1 was cut into two pieces with a size of 15 x 15 cm, which were used as the bottom film and the top film, respectively.
• the bottom film was set in a pouch mold with a bottom surface of 40 x 45 mm and a depth of 18 mm, and after heating at 100 ° C for 4 seconds, a vacuum was created between the bottle film and the pouch mold to mold the bottom of the pouch. Next, water was brushed onto the four sides of the bottom film, and the top film was placed on top of it to overlap the four sides of each film.
• the obtained pouch was used to carry out a water solubility test.
• the obtained pouch was placed in a wire frame cage (10 cm x 9 cm x 6.4 cm, wire gauge 1.25 mm, opening 1.27 cm).
• a 5 cm rotor was used to stir 1200 milliliters of distilled water in a 2-liter beaker at 400 rpm.
• the wire frame cage and pouch were placed in a position where the cage was 1 inch (2.54 cm) from the bottom of the beaker.
• the dissolution state of the film was visually observed to confirm whether the film was completely dissolved.
• the case without residue was marked as A, and the case with residue was marked as B.
• the obtained coating liquid was cooled to 25° C., and coated on paper (Solide Lucent 78 gsm) as a support using a bar coater so that the thickness of the coating liquid after coating (hereinafter sometimes simply referred to as "thickness of the coating liquid”) was 133 ⁇ m.
• the wet coating film on the support was dried in a hot air dryer at 80° C. for 30 minutes to obtain a laminate including the support and the coating film.
• Examples 29 to 42 and Comparative Examples 33 to 36> A laminate including a support and a coating film was obtained in the same manner as in Example 28, except that the materials and manufacturing conditions were as shown in Table 4 below. When coating was performed twice, coating was performed in the same manner as in the first coating on the dried coating film on the support obtained by the first coating and drying, and the obtained wet coating film was then dried for 30 minutes in a hot air dryer at 80°C.
• Coating film thickness coating liquid concentration [mass%] ⁇ coating liquid thickness [ ⁇ m] / 100
• Concentration of coating liquid [mass%] ⁇ (mass of coating liquid [g] - mass of water contained in coating liquid [g]) / mass of coating liquid [g] ⁇ ⁇ 100
• the total thickness of the coating film when coating was performed twice was calculated by replacing "thickness of the coating liquid" in the above formula with "total thickness of the coating liquid”.
• ⁇ Flexibility> The laminate was folded with the coated surface facing inward. A 2 kg rubber roller was rolled back and forth once from one end of the folded area (crease) to the other end to create a crease. Toluene colored with food coloring was applied to 10 cm of the crease on the coated surface side, and then it was confirmed whether or not there was any strike-through (small red spots or full coloring of the coated surface) to the back surface (uncoated surface). If there was no strike-through, the same operation was repeated again to confirm whether or not there was any strike-through. The maximum number of times that the coating was bent without any strike-through was taken as the bending resistance [times], and the maximum value was 5 times. The larger this value, the better the mechanical strength of the coating layer, and the less likely it was to crack when folded.
• OTR oxygen transmission rate
• the oxygen transmission rate (cc/m 2 ⁇ day ⁇ atm) of the laminate was measured under the following conditions using an oxygen transmission rate measuring device (OXYSENSE MODEL 8101e manufactured by Systech Illinois). Temperature: 23°C Humidity on oxygen supply side: 50% RH Humidity on the carrier gas side: 50% RH Carrier gas flow rate: 10 mL/min Oxygen pressure: 1.0 atm Carrier gas pressure: 1.0 atm

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Medicinal Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Polymers & Plastics (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Manufacturing & Machinery (AREA)
• Wrappers (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=95581918

Family Applications (1)

Country Status (2)

Citations (2)

• 2024
  • 2024-09-24 WO PCT/JP2024/034009 patent/WO2025094541A1/ja active Pending
  • 2024-09-24 JP JP2025508443A patent/JP7775531B2/ja active Active

Patent Citations (2)

Also Published As

Similar Documents

Legal Events