Pouch

Abstract

The present invention pertains to a pouch comprising a water-soluble film that contains at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof.

Description

[Technical Field]

[0001] 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. [Background technology]

[0002] A known method involves packaging a liquid drug in a water-soluble film to form a pouch, and then immersing the pouch in water to dissolve the contents together with the film in water (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-081901 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, when the pouch is filled with laundry detergent or the like, if 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 undissolved in the clothes. Furthermore, polysaccharides may have particularly low solubility in cold water. Furthermore, the pouch containing the contents also needs to have sufficient mechanical strength to prevent breakage during transportation.

[0005] Therefore, an object of the present invention is to provide a pouch comprising a water-soluble film that has excellent solubility and mechanical strength at low temperatures, a laminate comprising a water-soluble film and a support, and a coating agent for forming the water-soluble film. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to solve the above problems, and as a result have found that the above problems can be solved, leading to the completion of the present invention. That is, the present invention includes the following preferred embodiments.

[0007] [1] 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. [2] The pouch according to [1], wherein the polysaccharide A is selected from tamarind seed gum and its derivatives. [3] The pouch according to [1] or [2], wherein the content of the polysaccharide A is 5 to 80% by mass relative to the mass of the water-soluble film. [4] The pouch according to any one of [1] to [3], wherein the water-soluble film further contains a plasticizer. [5] The pouch according to [4], wherein the plasticizer is at least one selected from the group consisting of polyhydric alcohols, hydroxy acids, monosaccharides, and disaccharides. [6] The pouch according to [4] or [5], wherein the 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. [7] The pouch according to any one of [4] to [6], wherein the plasticizer is at least one selected from the group consisting of glycerin, ethylene glycol, sorbitol, and fructose. [8] The pouch according to any one of [4] to [7], wherein the content of the plasticizer is 20 to 95% by mass relative to the mass of the water-soluble film. [9] The pouch according to any one of [1] to [8], wherein the water-soluble film further contains a polysaccharide B different from the polysaccharide A.

[10] The polysaccharide B is guar gum ,treeThe pouch according to [9], wherein the material is at least one selected from the group consisting of santa gum, carrageenan, alginic acid, pullulan, and derivatives thereof.

[11] The pouch according to [9] or

[10] , wherein the content of the polysaccharide B is 1 to 30% by mass relative to the mass of the water-soluble film.

[12] The pouch according to any one of [1] to

[11] , wherein the water-soluble film has a toughness of 400 or more.

[13] The pouch according to any one of [1] to

[12] , which dissolves in water at 10°C within 1000 seconds.

[14] 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.

[15] 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.

[16] 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.

[17] A water-soluble film used for 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, wherein the content of the plasticizer is 45% by mass or less relative to the mass of the water-soluble film.

[18] The water-soluble film according to any one of

[15] to

[17] , which is a coating film formed from a coating agent containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof.

[19] 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.

[20]

[15] ~

[18] A packaging material comprising the water-soluble film described in 1.

[21] A coating agent containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a pouch comprising a water-soluble film, which has excellent solubility at low temperatures and mechanical strength, a laminate comprising a water-soluble film and a support, and a coating agent for forming the water-soluble film. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail. Note that the following description is merely illustrative of embodiments of the present invention, and is not intended to limit the present invention to the following embodiments. Note that the upper and lower limits described in this specification can be arbitrarily combined to form a suitable numerical range.

[0010] [Pouch] 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.

[0011] <Polysaccharide A> 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. Commercially available tamarind seed gums such as "Glyloid 6C (registered trademark)," "Glyate (registered trademark)," "Glyloid (registered trademark) 3S," and "Glyloid (registered trademark) 2A" (manufactured by MP Gokyo Food & Chemical Co., Ltd.), and "TG120" (manufactured by Mitsubishi Chemical Corporation) may be used.

[0012] 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. Commercially available locust bean gums, such as "Soarlocust A120," "Soarlocust A200," and "MC1000" (manufactured by Mitsubishi Chemical Corporation) and GRINSTED LBG 860 (manufactured by Sansho Co., Ltd.), may be used.

[0013] 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. Commercially available tara gum products such as "MT120" and "MT1000" (manufactured by Mitsubishi Chemical Corporation) and Spinogum D (manufactured by Sansho Co., Ltd.) may be used.

[0014] Derivatives of these polysaccharides 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; products etherified with ethylene oxide or propylene oxide; enzyme-treated products; acid hydrolysates, etc. Polysaccharides A may be used singly or in combination of two or more.

[0015] In one embodiment of the present invention, the number-average molecular weight (sometimes referred to as Mn) of polysaccharide A is preferably 5 kDa to 50,000 kDa, more preferably 7 kDa to 10,000 kDa, and even more preferably 10 kDa to 5,000 kDa, and may be, for example, 10 kDa to 3,000 kDa, 15 kDa to 1,000 kDa, or 20 kDa to 700 kDa. The weight-average molecular weight (sometimes referred to as Mw) of polysaccharide A is preferably 5 kDa to 150,000 kDa, more preferably 10 kDa to 50,000 kDa, and even more preferably 20 kDa to 30,000 kDa, and may be, for example, 30 kDa to 10,000 kDa, 50 kDa to 7,000 kDa, or 70 kDa to 5,000 kDa. Having Mn and / or Mw within the above ranges can improve the solubility and mechanical strength of the pouch at low temperatures. When polysaccharide A is composed of two or more polysaccharides, the Mn of polysaccharide A is the weighted average of the Mn of the two or more polysaccharides. The same applies to Mw.

[0016] In one embodiment of the present invention, 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, and may be, 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, and may be, for example, 500k to 4,500kDa or 1,000k to 4,000kDa. The Mn of locust bean gum is preferably 5k to 50,000kDa, more preferably 7k to 10,000kDa, and even more preferably 10k to 5,000kDa, and may be, for example, 15 to 1,000kDa or 20 to 300kDa.The Mw of locust bean gum is preferably 5k to 150,000kDa, more preferably 10k to 30,000kDa, and even more preferably 15k to 15,000kDa, and may be, for example, 20k to 5,000kDa, 30k to 1,000kDa, or 50k to 500kDa. The Mn of tara gum is preferably 5k to 10,000kDa, more preferably 7k to 5,000kDa, and even more preferably 10k to 1,000kDa, and the Mw of tara gum is preferably 5k to 30,000kDa, more preferably 10k to 15,000kDa, and even more preferably 15k to 10,000kDa. When the Mn and / or Mw of each polysaccharide is within the above range, the solubility at low temperatures and the mechanical strength of the pouch can be improved. Note that polysaccharide A may contain polysaccharides of the same type but with different Mn and / or Mw. The Mn and Mw of these polysaccharides A can be determined by gel filtration HPLC, for example, by the method described in the Examples below.

[0017] The present inventors conducted research focusing on polysaccharides and unexpectedly found that films formed using at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and their derivatives exhibit both excellent low-temperature solubility and mechanical strength. While the reason for this is unclear, it is believed that these polysaccharides A have a steric hindrance structure in their side chains, which makes them more soluble in water and reduces crystallization, and that their ability to form higher-order networks through intermolecular interactions and hydrogen bonds contributes to increased mechanical strength. Furthermore, these polysaccharides A have high heat, acid, and salt resistance, which minimizes molecular weight loss during film production and minimizes changes in physical properties even when exposed to acidic or salt-containing liquids, making them suitable for use in pouches. Furthermore, their high resistance to enzymes such as amylase makes them suitable for use in, for example, enzyme-containing detergent pouches.

[0018] 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 to 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. When the content of polysaccharide A is within the above range, the pouch will have excellent solubility at low temperatures and mechanical strength.

[0019] In a preferred embodiment of the present invention, the polysaccharide A is selected from tamarind seed gum and its derivatives. When the polysaccharide A is selected from tamarind seed gum and its derivatives, the pouch has better solubility at low temperatures and mechanical strength. In a more preferred embodiment, the polysaccharide A is selected from the group consisting of tamarind seed gum, sodium salts or potassium salts of anionized tamarind seed gum, and enzyme-treated tamarind seed gum.

[0020] <Plasticizer> In the pouch of the present invention, it is preferable that the water-soluble film further contains a plasticizer. When the water-soluble film contains a plasticizer, processability can be improved, such as facilitating film formation and pouch formation. 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. Furthermore, they can form a high-order network by hydrogen bonding with polysaccharide A, thereby improving processability and further increasing the mechanical strength, particularly elongation, of the pouch. One type of plasticizer may be used alone, or two or more types may be used in combination.

[0021] Examples of the polyhydric alcohol 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.

[0022] Examples of the hydroxy acid include lactic acid, glycolic acid, malic acid, and tartaric acid.

[0023] Examples of the monosaccharides include glucose, mannose, galactose, fructose, and xylose.

[0024] Examples of the disaccharides include maltose, trehalose, sucrose, and lactose.

[0025] Among these, from the viewpoint of further increasing the mechanical strength of the pouch, 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.

[0026] The content of the plasticizer, relative to the mass of the water-soluble film, may be, for example, 0 to 99.9 mass%, 5 to 99 mass%, or 10 to 95 mass%, 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% but 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%. When 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.

[0027] In one embodiment of the present invention, the 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. When the 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. Furthermore, when the water-soluble film further contains polysaccharide B (described below), the ratio (mass ratio) of polysaccharide A and polysaccharide B to plasticizer is preferably within the above range.

[0028] <Polysaccharide B> In one embodiment of the present invention, in the pouch of the present invention, it is preferred that the water-soluble film further contains a polysaccharide B different from the polysaccharide A. When the water-soluble film further contains polysaccharide B, a higher-order network can be formed by hydrogen bonding with polysaccharide A, thereby further improving the mechanical strength of the pouch.

[0029] As polysaccharide B, guar gum was used from the viewpoint of further increasing the mechanical strength of the pouch. ,tree It is preferably at least one selected from the group consisting of santa gum, carrageenan, alginic acid, pullulan and derivatives thereof.

[0030] 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. As guar gum, for example, commercially available products such as "Guapak (registered trademark)" (manufactured by MP Gokyo Food & Chemical Co., Ltd.), "RG100" (manufactured by Mitsubishi Chemical Corporation), "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.

[0031] Xanthan gum is a polysaccharide produced by fermenting starch with the bacterium Xanthomonas campestris. It has a glucose backbone and a side chain containing one glucuronic acid between two mannose units. Commercially available xanthan gums, such as "Echogum (registered trademark)" (manufactured by MP Gokyo Food & Chemical Co., Ltd.), "Soaxan," and "XG800" (manufactured by Mitsubishi Chemical Corporation), may be used.

[0032] Carrageenan is a polysaccharide obtained from red algae and contains repeating units of D-galactose or 3,6-anhydro-D-galactose and sulfate groups. Carrageenan is classified into kappa (κ) carrageenan, iota (ι) carrageenan, and lambda (λ) carrageenan. These can be used alone or in combination. Commercially available carrageenans include "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).

[0033] Examples of derivatives of polysaccharide B include sodium salts, potassium salts, calcium salts, cationized forms and salts thereof, anionized forms and salts thereof, enzyme-treated products, acid hydrolysates, etc. Polysaccharide B may be used singly or in combination of two or more types.

[0034] In one embodiment of the present invention, the number-average molecular weight (sometimes referred to as Mn) of polysaccharide B is preferably 5 kDa to 50,000 kDa, more preferably 10 kDa to 10,000 kDa, and even more preferably 10 kDa to 5,000 kDa, and may be, for example, 5 kDa to 1,000 kDa, 10 kDa to 500 kDa, or 15 kDa to 200 kDa. The weight-average molecular weight (sometimes referred to as Mw) of polysaccharide B is preferably 5 kDa to 150,000 kDa, more preferably 10 kDa to 50,000 kDa, and even more preferably 10 kDa to 30,000 kDa, and may be, for example, 10 kDa to 5,000 kDa, 30 kDa to 2,000 kDa, or 50 kDa to 1,000 kDa. When the Mn and / or Mw of polysaccharide B are within the above ranges, the mechanical strength of the pouch can be further increased. When polysaccharide B is composed of two or more polysaccharides, Mn of polysaccharide B is a weighted average of Mn of the two or more polysaccharides. The same applies to Mw.

[0035] In one embodiment of the present invention, the Mn of the guar gum is preferably 5k to 20,000kDa, more preferably 5 to 10,000kDa, even more preferably 7k to 5,000kDa, and may be, for example, 10k to 1,000kDa or 15k to 100kDa.The Mw of the guar gum is preferably 5k to 100,000kDa, more preferably 5k to 50,000kDa, and even more preferably 7k to 20,000kDa, and may be, for example, 10k to 5,000kDa, 30k to 1,000kDa, or 50k to 500kDa. The Mn of xanthan gum is preferably 5k to 50,000kDa, more preferably 7k to 10,000kDa, and even more preferably 10k to 5,000kDa, for example, 10k to 1,000kDa or 15k to 100kDa.The Mw of xanthan gum is preferably 5k to 150,000kDa, more preferably 7k to 50,000kDa, and even more preferably 10k to 30,000kDa, for example, 10k to 5,000kDa, 30k to 1,000kDa, or 50k to 500kDa. The Mn of the carrageenan is preferably 5k to 5,000kDa, more preferably 10k to 3,000kDa, and even more preferably 20k to 1,000kDa, and may be, for example, 25k to 500kDa or 30k to 200kDa.The Mw of the carrageenan is preferably 5k to 15,000kDa, more preferably 10k to 10,000kDa, and even more preferably 20k to 5,000kDa, and may be, for example, 50k to 2,000kDa or 100 to 1,000kDa. The Mn of alginic acid is preferably 5k to 50,000kDa, more preferably 7k to 10,000kDa, and even more preferably 10k to 5,000kDa, and may be, for example, 15 to 1,000kDa or 20 to 300kDa.The Mw of alginic acid is preferably 5k to 150,000kDa, more preferably 10k to 30,000kDa, and even more preferably 15k to 15,000kDa, and may be, for example, 20k to 5,000kDa, 30k to 1,000kDa, or 50k to 500kDa. When the Mn and / or Mw of each polysaccharide is within the above range, the mechanical strength can be further increased. Note that polysaccharide B may also contain polysaccharides of the same type but with different Mn and / or Mw. The Mn and Mw of these polysaccharides B can be determined by gel filtration HPLC, for example, by the method described in the Examples below.

[0036] In the water-soluble film, the polysaccharide A is selected from tamarind seed gum or a derivative thereof, and the polysaccharide B is selected from xanthan gum, and Guaga Hmm? It is preferable that the water-soluble film is at least one selected from the group consisting of: Such a water-soluble film tends to improve the mechanical strength of the pouch while maintaining the solubility at low temperatures.

[0037] 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, still 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. When the content of polysaccharide B is within the above range, the pouch can have excellent solubility at low temperatures and mechanical strength.

[0038] In one embodiment of the present invention, 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. When 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.

[0039] <Additives> In the pouch of the present invention, the water-soluble film contains a plasticizer, Fillers, dispersants, The polysaccharide composition may contain other additives (also referred to as additive A) in addition to polysaccharide B, as long as the effects of the present invention are not impaired. Ba, Moisture, antioxidants, UV absorbers, lubricants, colorants, preservatives Agent, Examples of additives A include surfactants, anti-sticking agents, release agents, pigments, crosslinking agents, etc. Additive A may be used alone or in combination of two or more. In this specification, the term "plasticizers", Fillers, dispersants, Polysaccharide B and additive A may be collectively referred to simply as "additives."

[0040] A filler refers to a component that is incompatible with polysaccharide A. In a pouch, if a water-soluble film contains a filler, it can form a higher-order network by hydrogen bonding with polysaccharide A, which can particularly improve the stress of the resulting pouch. Furthermore, particularly when producing a water-soluble film by coating, adding a filler to the coating agent increases the solids concentration, allowing the thickness of the coating film to be increased.

[0041] Examples of fillers include 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 (sericite), phloxopite, biotite, fluorphlogopite (artificial mica), red mica, soda mica, vanadium mica, illite, zinc 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 solid, hollow, or core-shell organic pigments. These fillers may be used singly or in combination of two or more.

[0042] When the water-soluble film in the pouch contains a filler, the total content of the filler relative to the mass of the water-soluble film is preferably 0.1 to 50% by mass, more preferably 0.5 to 35% by mass, even more preferably 1 to 30% by mass, even more preferably 1.5 to 20% by mass, even more preferably 2 to 18% by mass, even more preferably 2 to 15% by mass, even more preferably 2 to 10% by mass, and particularly preferably 2 to 6% by mass, from the viewpoint of improving the stress of the resulting pouch. Furthermore, from the viewpoint of increasing the thickness of the coating film, the total content is preferably 1 to 90% by mass, more preferably 5 to 80% by mass, even more preferably 10 to 75% by mass, even more preferably 20 to 70% by mass, even more preferably 30 to 65% by mass, even more preferably 40 to 60% by mass, even more preferably 42 to 58% by mass, and particularly preferably 45 to 55% by mass.

[0043] Alternatively, a dispersant may be added separately to the coating agent for forming 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 products, polyamine-epihalohydrin or formaldehyde condensation products, polyamide polyurea-epihalohydrin or formaldehyde condensation products, polyamine polyurea-epihalohydrin or formaldehyde condensation products, polyamidoamine polyurea-epihalohydrin or formaldehyde condensation products, polyamidoamine polyurea-epihalohydrin or formaldehyde condensation products, polyamide polyurea compounds, polyamine polyurea compounds, polyamidoamine polyurea compounds, polyamide amine compounds, polyethyleneimine, polyvinylpyridine, amino-modified acrylamide compounds, polyvinylamine, polydiallyldimethylammonium chloride, and modified polyvinyl alcohol. Dispersants may be used alone or in combination of two or more. In the pouch, when the water-soluble film contains a dispersant, the content of the dispersant is preferably 0.01 to 20% by mass, more preferably 0.1 to 10% by mass, and even more preferably 1 to 5% by mass, relative to the mass of the water-soluble film.

[0044] Examples of crosslinking agents include tannic acid and its salts, tannins other than tannic acid, catechin, anthocyanin, gallic acid and its salts, phenols, and hydroquinone.

[0045] 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 mass%, preferably 0.001 to 10 mass%, more preferably 0.01 to 5 mass%, and even more preferably 0.1 to 1 mass%, relative to the mass of the water-soluble film.

[0046] In one embodiment of the present invention, 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 even 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, and especially preferably 0 to 0.1% by mass. The polyvinyl alcohol-based resin used in the present invention can be made from vinyl acetate containing petroleum-derived carbon, vinyl acetate containing biomass-derived carbon, or a mixture thereof. Alternatively, a polyvinyl alcohol-based resin whose apparent biomass ratio has been changed using a mass balance method may be used.

[0047] In one embodiment of the present invention, the total content of polysaccharide A, plasticizer, and polysaccharide B contained in the water-soluble film of the pouch of the present invention 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 preferably 95% by mass or more, and particularly preferably 98% by mass or more, based on the mass of the water-soluble film. That is, it 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 preferably 95 to 100% by mass, and particularly preferably 98 to 100% by mass. When the total content of polysaccharide A, plasticizer, and polysaccharide B contained in the water-soluble film is within the above range, the solubility and mechanical strength of the pouch at low temperatures can be further improved. Note that the above total content also includes cases where the plasticizer and / or polysaccharide B is 0% by mass.

[0048] <Water-soluble film> The pouch of the present invention comprises a water-soluble film. In the present invention, water-soluble means soluble in water, preferably meaning that the solubility in 90°C hot water is 90% by mass or more. That is, a water-soluble film can be evaluated as water-soluble if, after adding the film to 90°C hot water and stirring for 5 minutes to dissolve the film, the amount of solids that do not pass through a filter (21 μm) is 10% by mass or less. The mass of the water-soluble film to be dissolved in 90°C hot water is 0.1 part by mass per 100 parts by mass of 90°C hot water. When the solubility of the water-soluble film in 90°C hot water is 90% by mass or more, preferably 95% by mass or more, and more preferably 98% by mass or more, residue is less likely 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, and 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 by, for example, appropriately adjusting the type and / or amount of components (such as additives) contained in the water-soluble film.

[0049] In one embodiment of the present invention, the water-soluble film can be dissolved in water at 10°C preferably within 1000 seconds. That is, when a water-soluble film measuring 30 mm in length, 40 mm in width, and 50 μm in thickness 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. When the time for complete dissolution of the water-soluble film in water at 10°C is equal to or less than the upper limit, this is preferable because the contents are rapidly released when a pouch containing the film is used, particularly when dissolved in cold water. Furthermore, residue is less likely to remain. The lower limit of the time for complete dissolution is not particularly limited; 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 be equal to or less than the upper limit by, for example, appropriately adjusting the type and / or amount of components contained in the water-soluble film, the production conditions of the water-soluble film (e.g., drying conditions), etc. The time for complete dissolution in water at 10°C can be determined, for example, by the method described in the Examples below.

[0050] The thickness of the water-soluble film is preferably 1 to 500 μm, more preferably 5 to 300 μm, and even more preferably 10 to 100 μm. When 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.

[0051] 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. When the maximum stress of the water-soluble film is at or above the above-mentioned lower limit, the mechanical strength of a 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. That is, 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 at or above the above-mentioned lower limit by, for example, appropriately adjusting the type and / or amount of components contained in the water-soluble film; the production conditions of the water-soluble film (e.g., drying temperature and / or time); etc.

[0052] 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. When the breaking elongation of the water-soluble film is at or above the lower limit, the mechanical strength of a 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. That is, preferred ranges are 10 to 150%, 25 to 150%, 35 to 150%, 40 to 150%, 50 to 150%, 70 to 150%, 75 to 150%, 80 to 150%, or 85 to 140%. The breaking elongation of the water-soluble film can be adjusted to be equal to or greater than the above lower limit by, for example, appropriately adjusting the type and / or amount of components contained in the water-soluble film, the production conditions of the water-soluble film (for example, 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.

[0053] 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, particularly more preferably 1400 or more, particularly 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. When 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. That is, 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 multiplying the maximum stress in a tensile test by the elongation at break.

[0054] In one embodiment of the present invention, 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 textured, such as with an embossed or textured pattern, to prevent adhesion between products. Such textured processing can be performed using methods known in the art.

[0055] <Method of manufacturing water-soluble film> There are no particular limitations on the method for producing the water-soluble film used in the pouch of the present invention, and it can be produced by any method known in the art. The water-soluble film may be, for example, (1) A step of obtaining a coating liquid (coating agent) by stirring at a predetermined temperature 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; (2) forming a coating film; and (3) A step of drying the coating film to form a dry coating film. It can be produced by a method comprising:

[0056] The solid content of the coating liquid is preferably 1 to 15% by mass, more preferably 2 to 10% by mass. The solid content indicates the total mass of components other than the solvent (for example, polysaccharide A, additives, etc.) relative to the mass of the coating liquid.

[0057] 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. The stirring method is not particularly limited, and stirring can be carried out by a conventionally known method.

[0058] The solvent is not particularly limited, but water, ethanol, methanol, 1-propanol, 2-propanol, etc. are preferred because they easily dissolve polysaccharide A and facilitate subsequent drying.

[0059] The coating film can be formed, for example, by applying a coating liquid onto a substrate, such as a polyolefin (e.g., polyethylene, polypropylene, etc.), a polyester (e.g., polyethylene terephthalate, etc.), a polyamide (e.g., nylon 6, nylon 66, etc.), a fluororesin (e.g., Teflon (registered trademark)), or a metal plate.

[0060] Examples of a method for applying the coating liquid to a substrate or the like include known methods such as spin coating, extrusion, bar coating, applicator, etc. Examples of 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.

[0061] The solvent is then removed by drying or the like to form a dry coating film. Drying methods include natural drying, ventilation drying, heat drying, and reduced pressure drying. Conventional dryers can be used, including steam heaters, gas heaters, infrared heaters, electric heaters, hot air heaters, microwaves, and cylinder dryers. The dried coating is a water-soluble film.

[0062] Alternatively, the water-soluble film can be produced by a melt extrusion film-forming method in which a film-forming solution obtained using an extruder or the like is extruded through a T-die or the like to form a film, or by an inflation molding method.

[0063] After forming the water-soluble film on the substrate, the substrate can be removed to obtain the water-soluble film. Alternatively, the substrate may be used as is without being peeled off. When the substrate is not peeled off, a laminate including 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.

[0064] [Laminate] The present invention also encompasses a laminate comprising a support and 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 support is preferably paper or film. In this embodiment, the laminate of the present invention contains a specific polysaccharide A, and therefore has excellent solubility at low temperatures and mechanical strength.

[0065] In a laminate containing a water-soluble film and a support, examples of the support include paper or film (hereinafter also referred to as "support film").

[0066] When the support is paper, examples of the paper include kraft paper, one-side glossy kraft paper, one-side glossy bleached kraft paper, bleached kraft paper, unbleached kraft paper, fine paper, medium-quality paper, coated paper, one-side glossy paper, construction paper, glassine paper, graphene paper, parchment paper, synthetic paper, white cardboard, manila cardboard, milk carton base paper, cup base paper, ivory paper, silver paper, tissue paper, paperboard, rayon paper, wax paper, liner paper, and the like. The basis weight of the paper is 20 to 400 g / m from the viewpoint of being suitable for packaging applications. 2 It is preferable that the density is 25 to 150 g / m 2 From the viewpoint of suitability for use as a flexible packaging material, which will be described later, the basis weight of the paper is 30 to 100 g / m 2 More preferably, it is 40 to 70 g / m 2 The basis weight of the paper is measured in accordance with JIS P 8124:2011.

[0067] The above paper can generally be produced by papermaking a stock containing pulp, a filler and various auxiliary agents. Examples of 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-ground pulp and thermomechanical pulp; wood fibers such as deinked pulp and recycled paper pulp; and non-wood fibers obtained from kenaf, bamboo, hemp, etc. These can be used alone or in combination of two or more. Among these, chemical pulp from wood fibers and mechanical pulp are preferred, and chemical pulp is more preferred, 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, achieving good printing due to high brightness, and increasing the useful value (especially when used as 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 and nylon.

[0068] Examples of fillers include white carbon, talc, kaolin, clay, heavy calcium carbonate, light calcium carbonate, titanium oxide, zeolite, synthetic resin fillers, etc. These can 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. Optionally, dyes, fluorescent whitening agents, pH adjusters, antifoaming agents, pitch control agents, slime control agents, and additives containing two or more of these can also be used.

[0069] The method for producing paper is not particularly limited, and paper can be produced, for example, according to the following procedure. First, a stock is prepared by mixing a pulp slurry with a filler and various auxiliaries. The pulp slurry can be prepared by beating pulp in the presence of water. The pulp beating method and beating device are not particularly limited, and known beating methods and beating devices can be used. The pulp content in the stock is not particularly limited. For example, it is 60% by mass or more and less than 100% by mass relative to the total mass of the stock. The prepared paper stock is then made into paper using a known Fourdrinier former, on-top hybrid former, gap former, or other machine using an acidic, neutral, or alkaline papermaking method. Multiple sheets of the wet paper obtained after dewatering are stacked as needed, and one or more sheets are pressed and dried to obtain paper. If multiple wet papers are not stacked, a single-layer paper is obtained, and if multiple wet papers are stacked, a multi-layer paper is obtained. When stacking multiple wet papers, an adhesive may be applied to the surface of the wet paper (the surface on which other wet papers are stacked).

[0070] The paper surface may be treated with various chemicals. Examples of 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, and lubricants. These can be used alone or in combination. Furthermore, these various chemicals can be used in combination with pigments. Examples of pigments include inorganic pigments such as kaolin, clay, engineered kaolin, delaminated clay, ground calcium carbonate, precipitated 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, and core-shell pigments. These can be used alone or in combination.

[0071] The method for treating the surface of paper is not particularly limited, and can be performed 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.

[0072] 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.

[0073] The average thickness of the paper or film used as the support is, for example, about 1 to 500 μm, or about 10 to 300 μm.

[0074] In the laminate, the water-soluble film may be a single layer or multiple layers. When the water-soluble film is a multiple layer, 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-sealing layer at any location in the layer structure. When the laminate has a protective layer and / or a heat-sealing layer, it is preferable that the layer is disposed as the outermost layer of the laminate.

[0075] The barrier layer may be a gas barrier layer or a water vapor barrier layer, and such barrier layers are known in the art. Examples of the barrier layer include a resin layer and a metal foil, and more specific examples include a resin layer containing polyvinyl alcohol, an ethylene-vinyl alcohol copolymer, and / or polyvinylidene chloride, a layer containing polysaccharide A but not corresponding to the water-soluble film of the present invention, an aluminum foil, an aluminum vapor-deposited film (aluminum vapor-deposited on a substrate such as polyethylene, polypropylene, nylon, polyethylene terephthalate, or ethylene-vinyl alcohol copolymer), an alumina vapor-deposited film (alumina vapor-deposited on a substrate such as polyethylene, polypropylene, nylon, polyethylene terephthalate, or ethylene-vinyl alcohol copolymer), and a silica vapor-deposited film (silica vapor-deposited on a substrate such as polyethylene, polypropylene, nylon, polyethylene terephthalate, or ethylene-vinyl alcohol copolymer).

[0076] The protective layer, 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 exhibited. Examples of protective layers include a resin layer, a paper layer, and a metal foil.

[0077] The heat-sealing layer may be any layer known in the art. The heat-sealing layer is preferably a resin layer having heat-sealing properties. The heat-sealing layer preferably contains a water-dispersible resin and, optionally, additives. Examples of water-dispersible resins 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. Examples of optional additives include lubricants such as paraffin wax, carnauba wax, and polyolefin waxes, pigments such as silica and kaolin, and combinations thereof. The heat-sealing layer may have barrier properties, in which case it can function as both a heat-sealing layer and a barrier layer. When the support is a film having a barrier or protective property, the film can also function as a barrier or protective layer.

[0078] 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: Note that the following configurations are each described starting from the layer that will become the outermost layer (the layer on the opposite side to the layer that comes into contact with the contents) when used as, for example, 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 / water-soluble film / gas barrier layer or water vapor barrier layer / paper or support film or metal foil, Protective layer / water-soluble film / water vapor barrier layer / gas barrier layer / paper or support film or metal foil, Protective layer / water-soluble film / gas barrier layer / water vapor barrier layer / 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 / gas barrier layer or water vapor barrier layer, Protective layer / water vapor barrier layer / gas barrier layer / water-soluble film / paper or support film or metal foil / gas barrier layer or water vapor barrier layer, Protective layer / gas barrier layer / water vapor barrier layer / water-soluble film / paper or support film or metal foil / gas barrier layer or water vapor barrier layer, Protective layer / water vapor barrier layer / gas barrier layer / water-soluble film / paper or support film or metal foil / gas barrier layer / water vapor barrier layer, Protective layer / water vapor barrier layer / gas barrier layer / water-soluble film / paper or support film or metal foil / water vapor barrier layer / gas barrier layer, Protective layer / gas barrier layer / water vapor barrier layer / water-soluble film / paper or support film or metal foil / gas barrier layer / water vapor barrier layer, Protective layer / gas barrier layer / water vapor barrier layer / water-soluble film / paper or support film or metal foil / water vapor barrier layer / gas barrier layer, a layer structure including a heat seal layer on the opposite side to the outermost layer in the layer structure; a layer structure having a heat seal layer instead of the protective layer in the above layer structure, for example, a heat seal layer / water-soluble film / paper or a support film or a metal foil; The layer structure has an adhesive layer at one or more positions between each layer, for example, heat seal layer / adhesive layer / water-soluble film / paper or support film or metal foil.

[0079] More specific examples of the layer structure 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 (unstretched polyethylene) / water-soluble film / paper, CPE (unstretched 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 layer / water-soluble film / paper, Polypropylene / water-soluble film / paper, Polypropylene / adhesive layer / water-soluble film / paper, Uniaxially oriented polypropylene / water-soluble film / paper, Uniaxially oriented polypropylene / adhesive layer / water-soluble film / paper Biaxially oriented polypropylene / water-soluble film / paper, Biaxially oriented polypropylene / adhesive layer / water-soluble film / paper, PLA / water-soluble film / paper, PLA / adhesive layer / water-soluble film / paper PHA / water-soluble film / paper, PHA / adhesive layer / water-soluble film / paper PHBH / water-soluble film / paper, PHBH / adhesive layer / water-soluble film / paper PCL / water-soluble film / paper, PCL / adhesive layer / water-soluble film / paper, PBAT / water-soluble film / paper, PBAT / adhesive layer / water-soluble film / paper, PBS / water-soluble film / paper, PBS / adhesive layer / water-soluble film / paper.

[0080] <Method of manufacturing laminate> The method for producing the laminate of the present invention is not particularly limited, and it can be produced by a 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 method for producing the water-soluble film. The coating film in the laminate may be a single layer or multiple layers. By repeatedly coating a coating liquid (coating agent) on a support and removing the solvent, a multilayer laminate containing any layers in any stacking order can also be produced.

[0081] The laminate of the present invention can also be produced by integrating a water-soluble film, which has been 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. The integration method is not limited, and examples include a method in which water is applied to the surface of the water-soluble film and the coated surface is bonded to the support to integrate them, a method in which the water-soluble film and the support are integrated by thermocompression bonding, a method in which the water-soluble film and the support are integrated via a pressure-sensitive adhesive or adhesive, and an inflation method in which the water-soluble film-forming material and the material that forms the support (film) are co-extruded. When the films are integrated by thermocompression bonding, 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, if any. For example, the films can be integrated by thermocompression bonding at a temperature of 100 to 200°C and a pressure of 0.1 to 30 MPa for 0.1 to 10 seconds. If the attachment is via a pressure sensitive adhesive or glue, such pressure sensitive adhesive or glue is known in the art. 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.

[0082] When the laminate contains a plurality of water-soluble films, it may contain a combination of a water-soluble film produced by coating and a water-soluble film produced by a melt extrusion film forming method, an inflation molding method, or the like.

[0083] <Pouch> Because the pouch of the present invention comprises the water-soluble film, it has excellent solubility and mechanical strength at low temperatures. Therefore, the pouch of the present invention dissolves in 10°C water 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 especially preferably within 500 seconds. The lower limit of the dissolution time is not particularly limited, and shorter dissolution times are preferable. 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 components (e.g., additives) contained in the water-soluble film constituting the pouch; pouch manufacturing conditions (e.g., the amount of water applied, temperature, and pressure during water sealing, and 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.

[0084] The film contained in the pouch may be a monolayer film or a multilayer film. When the pouch comprises (or is composed of) a monolayer film, the monolayer film is the water-soluble film. When 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 improving the solubility and mechanical strength of the pouch at low temperatures, the pouch is preferably composed of a monolayer or multilayer water-soluble film, and further from the viewpoint of production efficiency, it is more preferable that the pouch be composed of a monolayer water-soluble film.

[0085] The pouch of the present invention has excellent mechanical strength, and its compression strength is preferably 50 N or more, more preferably 100 N or more, even more preferably 200 N or more, even more preferably 300 N or more, and particularly preferably 400 N or more, and may be, for example, 500 N, 600 N, 700 N, or 800 N or more. The upper limit of the compression strength of the pouch is usually 2000 N or less, preferably 1000 N or less. That is, preferred ranges are 50 to 2000 N, 100 to 2000 N, 200 to 2000 N, 300 to 2000 N, 400 to 2000 N, 500 to 2000 N, 600 to 2000 N, 700 to 2000 N, or 800 to 1000 N. The compressive strength of the pouch can be adjusted to above the lower limit by appropriately adjusting, for example, 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).

[0086] The pouch is not particularly limited as long as it is capable of packaging a substance (preferably a content), and may be sealed or partially open. The pouch may be, 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 the like, or may be in the form of a container, a cup, or the like. In one embodiment of the present invention, the pouch may be partially open, but is preferably sealed. In such an embodiment, the pouch more preferably contains a content and is sealed.

[0087] [Pouch manufacturing method] 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. Furthermore, a pouch containing a content can be produced, for example, by a method including a step of pouring the content into a bag-shaped film and sealing the opening; a step of forming a recess in a first film, pouring the content into the recess, and laminating and sealing a second film.

[0088] Methods for sealing a water-soluble film include sealing by applying water to the film surface and adhering the coated surface (also called water sealing), sealing by thermocompression (also called heat sealing), and sealing with an adhesive. A water seal is preferred from the viewpoint of minimizing thermal degradation of the film.

[0089] In one embodiment of the present invention, the water-soluble film has high adhesive strength due to moisture, and therefore can be suitably used for water sealing. In another embodiment of the present invention, the water-soluble film has high water-sealing properties and low heat-sealing properties. The low heat-sealing properties make it difficult for the film to adhere to the roll when produced using a roll-to-roll process, effectively preventing damage during production. Furthermore, the high water-sealing properties allow the produced water-soluble film to be simply and easily formed into a pouch using moisture.

[0090] [Pouch uses] The pouch of the present invention has excellent solubility and mechanical strength at low temperatures, making it particularly suitable for use in applications where it is dissolved in cold water. Therefore, the pouch of the present invention preferably contains at least one selected from the group consisting of cleaning agents, fabric softeners, and fragrances. The physical properties of the contents are not particularly limited, and may be acidic, neutral, or alkaline. Furthermore, the form of the contents may be any of powder, block, gel, and liquid.

[0091] [Water-soluble film] 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. Because the water-soluble film of the present invention in this embodiment contains a specific polysaccharide A, it has excellent solubility at low temperatures and mechanical strength, and can also be formed into a pouch having such properties. The water-soluble film is similar to the water-soluble film described above in the section [Pouch].

[0092] The present invention also encompasses 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. Because the water-soluble film of the present invention in this embodiment contains specific polysaccharides A and B, it has excellent solubility at low temperatures and mechanical strength, and can also be used to form a pouch having these properties. The water-soluble film is preferably similar to the water-soluble film described above in the section [Pouch], except that it contains the polysaccharide B as an essential component in addition to the polysaccharide A.

[0093] The present invention also encompasses 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, wherein the plasticizer content is 45% by mass or less relative to the mass of the water-soluble film. In this embodiment, 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, making it possible to form a pouch with these 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 above in the "Pouch" section, except for the essential requirement 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 a plasticizer, and that the plasticizer content is 45% by mass or less.

[0094] To prevent the plasticizer from bleeding out onto the film surface, 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.

[0095] [Packaging material] The present invention also encompasses packaging materials 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. In this embodiment, the packaging material of the present invention 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 section [Pouch], and preferably has similar solubility and mechanical strength. Furthermore, the packaging material preferably has similar solubility and mechanical strength to the pouch described in the above section [Pouch].

[0096] The packaging material is a film used for packaging, and may include a thin film, a thick film, etc., and may be in the form of a container, a cup, a tube, a tray, a bottle, etc. In one embodiment of the present invention, the packaging material may contain a substance therein, similar to the above-mentioned pouch, preferably at least one selected from the group consisting of a cleaning agent, a fabric softener, and a fragrance. [Example]

[0097] The present invention will be described in more detail below based on examples and comparative examples, but the present invention is not limited to the following examples.

[0098] Polysaccharide molecular weight Approximately 20 μg of each polysaccharide 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.

[0099] (Gel filtration HPLC conditions) Eluent: 0.1M aqueous sodium nitrate solution Column: One TSK GEL α-M Column temperature: 40℃ Flow rate: 1mL / min Sample concentration: 0.1 w / v% Sample preparation: The sample was dissolved by stirring at 80°C for 2.5 hours, and then further stirred at 90°C for 30 minutes. Filtration filter: 0.45 μm PP filter (Whatman) Injection volume: 100μL Standard: PEO / PEG Measurement time: 18 minutes Liquid delivery unit: GPC-101 (Shodex) Detector: RI or

[0100] Eluent: 5mM Na nitrate / DMSO Column: One TSK GEL α-M Column temperature: 60℃ Flow rate: 0.8mL / min Sample concentration: 0.2w / v% Sample preparation: The sample was dissolved by stirring at 60°C for 1 hour, and then further stirred at 65°C for 2.5 hours. Filtration: 0.45 μm PP filter (Whatman) Injection volume: 100μL Standard item: PMMA-R, Y, G Measurement time: 18 minutes Liquid delivery unit: GPC-101 (Shodex) Detector: RI

[0101] Preparation of water-soluble films Example 1 Six grams of tamarind seed gum (weight-average molecular weight 3,700 kDa, number-average molecular weight 429 kDa; "Glyloid 6C (registered trademark)" MP Gokyo Food & Chemical Co., Ltd.) was added to water and heated and stirred at 95°C for two hours to obtain a 4% aqueous solution. Four grams of glycerin were added to this solution to prepare a coating solution. The coating solution was applied to a polyethylene terephthalate film using a bar coater and dried with hot air at 60°C for one hour. The resulting dried coating film was peeled off from the polyethylene terephthalate film substrate to obtain a film approximately 50 μm thick.

[0102] <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.

[0103] Example 7 A film was obtained in the same manner as in Example 1, except that sorbitol was added in addition to glycerin when adding glycerin, and each component was added in the amount shown in Table 1.

[0104] <Examples 8 to 10> A film was obtained in the same manner as in Example 1, except that tannic acid was added in addition to glycerin when adding glycerin, and each component was added in the amount shown in Table 1.

[0105] <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.

[0106] <Examples 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.

[0107] Example 18 A film was obtained in the same manner as in Example 1, except that when adding glycerin, 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.

[0108] Example 19 A film was obtained in the same manner as in Example 1, except that when adding glycerin, 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.

[0109] Example 20 A film was obtained in the same manner as in Example 1, except that when adding glycerin, 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.

[0110] <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 the components were added in the amounts shown in Table 1.

[0111] <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.

[0112] 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.

[0113] <Comparative Example 1> A film was obtained in the same manner as in Example 3, except that κ-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.

[0114] <Comparative Examples 2 to 4> A film was obtained in the same manner as in Comparative Example 1, except that glycerin was added in the amount shown in Table 1.

[0115] <Comparative Examples 5 and 6> A film was obtained in the same manner as in Comparative Example 1, except that sorbitol was used instead of glycerin and each component was added in the amount shown in Table 1.

[0116] <Comparative Examples 7 to 8> Films were obtained in the same manner as in Comparative Examples 5 and 6, except that sodium alginate (weight average molecular weight 104 kDa, number average molecular weight 43 kDa; "Kimica Algin I-8" manufactured by Kimica Co., Ltd.) was used instead of κ-carrageenan.

[0117] <Comparative Examples 9 to 10> Films were obtained in the same manner as in Comparative Examples 5 and 6, except that guar gum (weight average molecular weight 93 kDa, number average molecular weight 17 kDa; "SUPERGEL CSA200 / 50" manufactured by Sansho Co., Ltd.) was used instead of κ-carrageenan.

[0118] <Comparative Example 11> A film was obtained in the same manner as in Comparative Example 5, except that gum arabic (weight average molecular weight 237 kDa, number average molecular weight 45 kDa; "TIC Pretested Gum Arabic Spray Dry Powder" manufactured by Ingredion) was used instead of κ-carrageenan.

[0119] <Comparative Example 12> A film was obtained in the same manner as in Comparative Example 5, except that gum arabic (weight average molecular weight 192 kDa, number average molecular weight 71 kDa; "TIC Pretested Gum Arabic FT" manufactured by Ingredion) was used instead of κ-carrageenan.

[0120] <Comparative Examples 13 to 14> Films were obtained in the same manner as in Comparative Examples 5 and 6, except that cation-modified starch ("CATO304", manufactured by Ingredion) was used instead of κ-carrageenan.

[0121] <Comparative 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.

[0122] <Comparative Examples 16 to 19> A film was obtained in the same manner as in Comparative Example 15, except that nonionic modified starch ("National 208", Ingredion) and glycerin were added in the amounts shown in Table 1.

[0123] <Comparative Example 20> A film was obtained in the same manner as in Comparative Example 15, except that sorbitol was used instead of glycerin.

[0124] <Comparative Example 21> A film was obtained in the same manner as in Comparative Example 17, except that sorbitol was used instead of glycerin.

[0125] <Comparative Example 22> Films were obtained in the same manner as in Comparative Examples 9 and 10, except that glycerin was used instead of sorbitol.

[0126] <Comparative Examples 23 to 24> A film was obtained in the same manner as in Example 1, except that xanthan gum (weight average molecular weight 92 kDa, number average molecular weight 16 kDa; Kimika Xanthan PH-R3EC, manufactured by Kimika Co., Ltd.) was used instead of tamarind seed gum.

[0127] [Table 1-1]

[0128] [Table 1-2]

[0129] Evaluation of water-soluble films <Water-soluble film thickness> The thickness of the film was measured using a micrometer. The thickness was measured at five or more random points on the film, and the average value was taken as the thickness.

[0130] <Water-soluble film> The films produced in the examples were added to 90°C warm water and stirred for 5 minutes to dissolve the film, and the amount of solids that did not pass through a filter (21 μm) was measured, and was found to be 10 mass% or less in all of Examples 1 to 23. The mass of the film added was 0.1 parts by mass relative to 100 parts by mass of 90°C warm water. <Time required for complete dissolution in cold water> The films prepared in the Examples and Comparative Examples were cut into 30 mm x 40 mm rectangles and sandwiched between slide mounts. A 600 ml glass beaker containing 500 ml of distilled water was placed in a separate thermostatic bath adjusted to 10°C, and the water was stirred at 400 rpm using a 5 cm rotor. After the distilled water in the beaker reached 10°C, the slide mount was immersed in the stirred water. The state of dissolution of the film was visually observed, and the time (seconds) until the film was completely dissolved was measured and evaluated according to the following evaluation criteria. When a film with a thickness other than 50 μm was used, the value was converted to a film thickness of 50 μm using the following formula. Equivalent complete dissolution time (seconds) = [50 / film thickness (μm)] 2 × Sample dissolution time (seconds) When the converted complete melting time was 600 seconds or less, it was marked as A, and when it was more than 600 seconds, it was marked as B.

[0131] <Film toughness> The films prepared in the examples and comparative examples were stored for 7 days at 23°C and 50% RH, after which five test pieces, each 10 mm wide and 120 mm long, were cut out. The maximum stress and elongation at break were measured for each test piece 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 values ​​were calculated. The value of the maximum stress x the elongation at break was taken as the toughness of the film.

[0132] The evaluation results are shown in Table 2. [Table 2-1]

[0133] [Table 2-2]

[0134] Pouch preparation Example 24 A benchtop pouch molding machine (DD-SR12-1, manufactured by Dada) was used to form the pouches. The film obtained in Example 1 was cut into two pieces measuring 15 x 15 cm, which were used as the bottom and top films. The bottom film was placed in a pouch mold with a base of 40 x 45 mm and a depth of 18 mm, and heated at 100°C for 4 seconds. A vacuum was then created between the bottle film and the pouch mold to form the bottom of the pouch. Water was then brushed onto the four edges of the bottom film, and the top film was placed on top of it, overlapping the four edges of each film. The overlapping portion of the bottom and top films was heated and compressed at 100°C for 10 seconds to bond the top film to the bottom film. Air was then injected between the pouch mold and the bottom film, and the formed pouch was removed from the mold. The surrounding film was then cut and removed, leaving a 1.5 cm adhesive area. <Examples 25 to 27> Pouches were obtained in the same manner as in Example 24, except that the films obtained in Examples 5, 14, and 23 were used. <Comparative Examples 25 to 32> Pouches were obtained in the same manner as in Example 24, except that the films obtained in Comparative Examples 1, 11, 12, and 14 to 18 were used.

[0135] Pouch evaluation <Bottom film state in pouch> The condition of the bottom film during bottom molding was evaluated visually. If the film strength is insufficient, the film will be damaged during bottom film molding. If the film was not damaged, it was marked as A, and if the film was damaged, it was marked as B.

[0136] <Air leakage from pouch> The obtained pouch was left for 24 hours in an environment of 23°C and 50% RH, and the air leakage of the pouch was evaluated. A was given for no air leakage, and B was given for air leakage.

[0137] <Water-soluble pouch> A water solubility test was conducted using the resulting pouch. The resulting 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). 1200 ml of distilled water was placed in a 2-liter beaker and stirred at 400 rpm using a 5 cm rotor. After the distilled water in the beaker reached 10°C, the wire frame cage and pouch were placed in the beaker so that the cage was 1 inch (2.54 cm) from the bottom. The film was visually observed for dissolution and confirmed to be completely dissolved. Cases with no residue were marked A, and cases with residue were marked B.

[0138] The evaluation results are shown in Table 3. [Table 3]

[0139] Fabrication of laminate Example 28 7 g of tamarind seed gum (Greate®) and 3 g of glycerin were added to purified water to a total concentration of 15% by mass, and the mixture was heated and stirred at 90°C for 1 hour to dissolve the mixture, yielding a coating solution (coating agent). The resulting coating solution was cooled to 25°C and applied to a paper support (Solide Lucent 78 gsm) using a bar coater, so that the thickness of the coating solution after application (hereinafter sometimes simply referred to as "coating solution thickness") was 133 μm. The wet coating film on the support was dried in a hot air dryer at 80°C for 30 minutes to yield a laminate comprising the support and the coating film.

[0140] <Examples 29 to 42 and Comparative Examples 33 to 36> A laminate including a substrate 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, the dried coating film on the substrate obtained by the first coating and drying was coated in the same manner as the first coating, and the resulting wet coating film was then dried in a hot air dryer at 80°C for 30 minutes.

[0141] <Coating film thickness> The thickness of the coating film was calculated using the following formula: Coating film thickness [μm] = coating liquid concentration [mass%] × coating liquid thickness [μm] / 100 Concentration of coating fluid [mass%] = {(mass of coating fluid [g] - mass of water contained in coating fluid [g]) / mass of coating fluid [g]} × 100 The total thickness of the coating film when coating was performed twice was calculated by substituting "thickness of coating liquid" in the above formula with "total thickness of coating liquid."

[0142] <Bending resistance> The laminate was folded with the coated side facing inward. A 2 kg rubber roller was rolled back and forth from one end of the folded area (crease) to the other to create a crease. Toluene colored with food coloring was applied to a 10 cm area of ​​the crease on the coated side, and then the back side (uncoated side) was checked for bleed-through (small red spots or full coloring of the coated surface). If no bleed-through was found, the same process was repeated to check for bleed-through. The maximum number of folds without bleed-through was taken as the flex resistance (cycles), with a maximum of 5 cycles. The higher this value, the better the mechanical strength of the coating layer, and the less likely it is to crack when bent.

[0143] <Oxygen Transmission Rate (OTR)> The oxygen permeability (cc / m) of the laminate was measured under the following conditions using an oxygen permeability measuring device (OXYSENSE MODEL 8101e manufactured by Systech Illinois). 2 ·day·atm) was measured. Temperature: 23℃ 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

[0144] The evaluation results are shown in Table 4.

[0145] [Table 4] Preferred embodiments of the present specification include at least the following. [1] 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, wherein the content of the polysaccharide A is 5 to 80% by mass relative to the mass of the water-soluble film. [2] The pouch according to [1], wherein the polysaccharide A is selected from tamarind seed gum and its derivatives. [3] The pouch according to [1], wherein the water-soluble film further contains a plasticizer. [4] The pouch according to [3], wherein the plasticizer is at least one selected from the group consisting of polyhydric alcohols, hydroxy acids, monosaccharides, and disaccharides. [5] The pouch according to [4], wherein the 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. [6] The pouch according to [5], wherein the plasticizer is at least one selected from the group consisting of glycerin, ethylene glycol, sorbitol, and fructose. [7] The pouch according to [3], wherein the content of the plasticizer is 20 to 95% by mass relative to the mass of the water-soluble film. [8] The pouch according to [1], wherein the water-soluble film further contains a polysaccharide B different from the polysaccharide A. [9] The pouch according to [8], wherein the polysaccharide B is at least one selected from the group consisting of guar gum, xanthan gum, carrageenan, alginic acid, pullulan, and derivatives thereof.

[10] The pouch according to [8], wherein the content of the polysaccharide B is 1 to 30% by mass relative to the mass of the water-soluble film.

[11] The pouch according to [1], wherein the toughness of the water-soluble film is 400 or more.

[12] The pouch according to [1], which dissolves in water at 10°C within 1000 seconds.

[13] The pouch according to [1], containing therein at least one selected from the group consisting of cleaning agents, fabric softeners, and fragrances.

[14] 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, wherein the content of polysaccharide A is 5 to 80% by mass relative to the mass of the water-soluble film.

[15] 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, wherein the content of polysaccharide A is 5 to 80% by mass relative to the mass of the water-soluble film.

[16] A water-soluble film used for 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, wherein the content of polysaccharide A is 5 to 80% by mass relative to the mass of the water-soluble film, and the content of plasticizer is 45% by mass or less relative to the mass of the water-soluble film.

[17] The water-soluble film according to any one of

[14] to

[16] , which is a coating film formed from a coating agent containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof.

[18] A laminate comprising the water-soluble film according to any one of

[14] to

[16] and a support, wherein the support is paper or a film.

[19] A packaging material comprising the water-soluble film according to any one of

[14] to

[16] .

[20] A coating agent containing at least one polysaccharide A selected from the group consisting of tamarind seed gum, locust bean gum, tara gum, and derivatives thereof, wherein the content of the polysaccharide A is 5 to 80 mass% based on the mass of the solid content of the coating agent.

[21] A pouch comprising a water-soluble film, wherein the water-soluble film contains a polysaccharide and a plasticizer, the polysaccharide containing 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 ratio (mass ratio) of the polysaccharide to the plasticizer is 10:90 to 65:35.

[22] The pouch according to

[21] , wherein the polysaccharide A is selected from tamarind seed gum and its derivatives.

[23] The pouch according to

[21] , wherein the content of the polysaccharide A is 5 to 80% by mass relative to the mass of the water-soluble film.

[24] The pouch according to

[21] , wherein the plasticizer is at least one selected from the group consisting of polyhydric alcohols, hydroxy acids, monosaccharides, and disaccharides.

[25] The pouch according to

[24] , wherein the 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.

[26] The pouch according to

[25] , wherein the plasticizer is at least one selected from the group consisting of glycerin, ethylene glycol, sorbitol, and fructose.

[27] The pouch according to

[21] , wherein the content of the plasticizer is 20 to 95% by mass relative to the mass of the water-soluble film.

[28] The pouch according to

[21] , wherein the water-soluble film further contains a polysaccharide B different from the polysaccharide A.

[29] The pouch according to

[28] , wherein the polysaccharide B is at least one selected from the group consisting of guar gum, xanthan gum, carrageenan, alginic acid, pullulan, and derivatives thereof.

[30] The pouch according to

[28] , wherein the content of the polysaccharide B is 1 to 30% by mass relative to the mass of the water-soluble film.

[31] The pouch according to

[21] , wherein the toughness of the water-soluble film is 400 or more.

[32] The pouch according to

[21] , which dissolves in water at 10°C within 1000 seconds.

[33] The pouch according to

[21] , containing therein at least one selected from the group consisting of cleaning agents, fabric softeners, and fragrances.

[34] A water-soluble film comprising a polysaccharide and a plasticizer, wherein the polysaccharide comprises 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 ratio (mass ratio) of the polysaccharide to the plasticizer is 10:90 to 65:35.

[35] A water-soluble film comprising a polysaccharide and a plasticizer, wherein the polysaccharide comprises 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, and the content ratio (mass ratio) of the polysaccharide to the plasticizer is 10:90 to 65:35.

[36] A water-soluble film used for 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, wherein the content ratio (mass ratio) of the polysaccharide to the plasticizer is 10:90 to 65:35.

[37] The water-soluble film according to

[36] , wherein the content of the plasticizer is 45% by mass or less relative to the mass of the water-soluble film.

[38] A water-soluble film, which is a coating film formed from a coating agent, 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 20 to 95% by mass relative to the mass of the water-soluble film.

[39] A laminate comprising the water-soluble film according to any one of

[34] to

[38] and a support, wherein the support is paper or a film.

[40] A packaging material comprising the water-soluble film according to any one of

[34] to

[38] .

[41] A coating agent 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, wherein the content of the plasticizer is 20 to 95 mass% based on the mass of the solid content of the coating agent.

Claims

1. A pouch comprising a water-soluble film, the water-soluble film comprises a polysaccharide and a plasticizer; the content ratio (mass ratio) of the polysaccharide to the plasticizer is 10:90 to 65:35, The polysaccharides include at least one polysaccharide A selected from tamarind seed gum and its derivatives; the content of the polysaccharide A is 5 to 80% by mass relative to the mass of the water-soluble film; The thickness of the water-soluble film is 1 to 500 μm. Pouch.

2. 2. The pouch of claim 1, wherein the plasticizer is at least one selected from the group consisting of polyhydric alcohols, hydroxy acids, monosaccharides, and disaccharides.

3. 2. The pouch according to claim 1, wherein the 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.

4. 2. The pouch of claim 1, wherein the plasticizer is at least one selected from the group consisting of glycerin, ethylene glycol, sorbitol, and fructose.

5. 2. The pouch according to claim 1, wherein the content of the plasticizer is 20 to 95% by mass relative to the mass of the water-soluble film.

6. 2. The pouch of claim 1, wherein the water-soluble film further comprises a polysaccharide B different from the polysaccharide A.

7. 7. The pouch according to claim 6, wherein the polysaccharide B is at least one selected from the group consisting of guar gum, xanthan gum, carrageenan, alginic acid, pullulan, and derivatives thereof.

8. 7. The pouch according to claim 6, wherein the content of the polysaccharide B is 1 to 30% by mass relative to the mass of the water-soluble film.

9. 2. The pouch of claim 1, wherein the water-soluble film has a toughness of 400 or greater.

10. 2. The pouch of claim 1, which dissolves in water at 10°C within 1000 seconds.

11. 10. The pouch of claim 1, wherein the pouch contains at least one selected from the group consisting of cleaning agents, fabric softeners, and fragrances.

12. A water-soluble film comprising a polysaccharide and a plasticizer, the content ratio (mass ratio) of the polysaccharide to the plasticizer is 10:90 to 65:35, The polysaccharides include at least one polysaccharide A selected from tamarind seed gum and its derivatives; the content of the polysaccharide A is 5 to 80% by mass relative to the mass of the water-soluble film; The thickness of the water-soluble film is 1 to 500 μm. Water-soluble film.

13. A water-soluble film comprising a polysaccharide and a plasticizer, the content ratio (mass ratio) of the polysaccharide to the plasticizer is 10:90 to 65:35, The polysaccharides include at least one polysaccharide A selected from tamarind seed gum and derivatives thereof, and a polysaccharide B different from the polysaccharide A; the content of polysaccharide A is 5 to 80% by mass relative to the mass of the water-soluble film; The thickness of the water-soluble film is 1 to 500 μm. Water-soluble film.

14. A water-soluble film used in a pouch, the water-soluble film comprises a polysaccharide and a plasticizer; the content ratio (mass ratio) of the polysaccharide to the plasticizer is 10:90 to 65:35, the polysaccharide includes at least one polysaccharide A selected from tamarind seed gum and derivatives thereof, the content of polysaccharide A is 5 to 80% by mass relative to the mass of the water-soluble film, and the content of plasticizer is 45% by mass or less relative to the mass of the water-soluble film; The thickness of the water-soluble film is 1 to 500 μm. Water-soluble film.

15. The water-soluble film according to any one of claims 12 to 14, which is a coating film formed from a coating agent.

16. A laminate comprising the water-soluble film according to any one of claims 12 to 14 and a support, wherein the support is paper or a film.

17. A packaging material comprising the water-soluble film according to any one of claims 12 to 14.

18. A coating agent comprising a polysaccharide and a plasticizer, the content ratio (mass ratio) of the polysaccharide to the plasticizer is 10:90 to 65:35, The coating agent, wherein the polysaccharide contains at least one polysaccharide A selected from tamarind seed gum and derivatives thereof, and the content of the polysaccharide A is 5 to 80 mass % based on the mass of the solid content of the coating agent.

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