Coating agent, film, and pouch

Abstract

To provide a coating agent capable of forming a coating film which exhibits excellent sliding properties of fluid substances such as curries, sauces, ketchup, mayonnaise and feces, and which suppresses or reduces cracking and clouding, and also to provide a film and a pouch which include a coating layer.SOLUTION: This coating agent comprises a polymer having a monomer unit containing a betaine structure, and at least one of an ionic liquid in which δd in Hansen solubility parameters is 10.0 MPa1 / 2 or more and 18.3 MPa1 / 2 or less, δp is 10.0 MPa1 / 2 or more and 20.0 MPa1 / 2 or less, and δh is 14.0 MPa1 / 2 or less, and an ionic surfactant having a molecular weight of less than 1000 in which δd in Hansen solubility parameters is 10.0 MPa1 / 2 or more and 18.3 MPa1 / 2 or less, δp is 10.0 MPa1 / 2 or more and 20.0 MPa1 / 2 or less, and δh is 14.0 MPa1 / 2 or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to coatings, films, and pouches. [Background technology]

[0002] A stoma is an artificial opening created in the abdominal wall through surgery or other means. It is an opening created to allow waste to leave the body when, for example, part of the digestive tract (such as the large intestine or rectum) is removed or when part of the urethra is removed.

[0003] The bag that collects waste discharged from the stoma is sometimes called a stoma pouch (hereinafter sometimes referred to as a "stoma appliance pouch"). When a certain amount of waste accumulates in the stoma pouch, the waste is discarded (for example, by flushing it down the toilet), and the stoma pouch can be continued to be used after cleaning as necessary. Because waste, especially feces, is viscous, it takes a fair amount of effort to remove the feces from the stoma pouch.

[0004] In order to facilitate the expulsion of feces from a stoma pouch, it is known to form a functional layer containing functional particles (specifically, hydrophobic particles and / or lipophobic particles) on the inner surface of the stoma pouch (see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6932547 [Patent Document 2] Patent No. 6467226 [Patent Document 3] WO / 2021 / 241295 Summary of the Invention [Problem to be solved by the invention]

[0006] However, it may be difficult to manufacture a stoma pouch by heat sealing using the stoma pouch film actually produced in Patent Document 1 (i.e., the stoma pouch film having a polyester film and a functional layer produced in the examples of Patent Document 1). This is because the stoma pouch film actually produced in Patent Document 1 has a fairly high content of functional particles in the functional layer, making it difficult to bond the functional layers together by heat sealing. In other words, it is difficult to bond the functional layers together with strong adhesive strength by heat sealing.

[0007] On the other hand, to facilitate the expulsion of feces from the stoma pouch, it is conceivable to treat the surface of the film with a fluorine compound having a low surface tension. However, it may be difficult to produce a stoma pouch by heat sealing using a film surface-treated with a fluorine compound. This is because it is difficult to bond surfaces that have been surface-treated with a fluorine compound together with a strong adhesive force by heat sealing.

[0008] In light of the above, it is meaningful to propose a new technology that can make it easier to empty stool from a stoma pouch.

[0009] Depending on the application of the pouch, it may be required that viscous fluids such as curry, sauce, ketchup, and mayonnaise (hereinafter referred to as "fluids") be easily dispensed. Thus, depending on the application of the pouch or film, it may be required that the fluids slide off easily, i.e., slide-off property.

[0010] An object of the present invention is to provide a coating agent capable of forming a coating film (i.e., a coating layer) that has excellent sliding properties for fluids (e.g., curry, sauce, ketchup, mayonnaise, feces, etc.) and that suppresses or reduces the occurrence of cracks and turbidity (specifically, turbidity due to aggregation of the betaine polymer, as described below).An object of the present invention is also to provide a film or pouch that includes a coating layer that has excellent sliding properties for fluids and that suppresses or reduces the occurrence of cracks and turbidity (specifically, turbidity due to aggregation of the betaine polymer, as described below). [Means for solving the problem]

[0011] In order to solve this problem, the present invention has the following configuration [1]. [1] A polymer containing a monomer unit having a betaine structure (hereinafter sometimes referred to as a "betaine polymer"), London dispersion term δ in Hansen solubility parameters (HSP) d is 10.0 MPa 1 / 2 Over 18.3MPa 1 / 2 and the dipole-dipole force term δ p is 10.0 MPa 1 / 2 Over 20.0MPa 1 / 2 is less than or equal to the hydrogen bond strength term δ h is 14.0 MPa 1 / 2 and the London dispersion term δ in the Hansen solubility parameters. d is 10.0 MPa 1 / 2 Over 18.3MPa 1 / 2 and the dipole-dipole force term δ p is 10.0 MPa 1 / 2 Over 20.0MPa 1 / 2 is less than or equal to the hydrogen bond strength term δ h is 14.0 MPa 1 / 2 and at least one of an ionic surfactant having a molecular weight of less than 1000 or less, Coating agent.

[0012] According to [1], the coating agent contains a polymer containing a monomer unit having a betaine structure, and therefore can form a coating film, i.e., a coating layer, that has excellent sliding properties for fluids (e.g., curry, sauce, ketchup, mayonnaise, feces, etc.). This will be explained below. Since the betaine polymer contains a monomer unit having a betaine structure, it can form a coating film that has excellent hydrophilicity. This coating film can absorb the moisture of the fluid and swell when it comes into contact with the fluid. Therefore, this coating film can form a lubricated surface when it comes into contact with the fluid. Because this surface is lubricated, it has excellent sliding properties for fluids, i.e., excellent sliding properties. Therefore, the coating agent of [1] can form a coating film, i.e., a coating layer, that has excellent sliding properties for fluids.

[0013] Moreover, the coating agent has a London dispersion term δ d 10.0MPa 1 / 2 Over 18.3MPa 1 / 2 Below, the dipole-dipole force term δ p 10.0MPa 1 / 2 Over 20.0MPa 1 / 2 Below, the hydrogen bond force term δ h 14.0MPa 1 / 2 The inclusion of the following ionic liquid and / or ionic surfactant can suppress or reduce the cloudiness that can occur due to the aggregation of betaine polymers, and also suppress or reduce the occurrence of cracks in the coating film. This will be explained. Since betaine polymers contain monomer units containing a betaine structure, they tend to have high cohesive strength, and therefore the cohesive strength of the coating film also tends to be high. Therefore, cracks can occur in coating films containing betaine polymers. In contrast, according to [1], ionic liquids and ionic surfactants can interact closely with betaine polymers, thereby reducing the cohesive strength between betaine polymers. In addition, the London dispersion force term δ d is 10.0 MPa 1 / 2 Over 18.3MPa 1 / 2 and the dipole-dipole force term δ p is 10.0 MPa 1 / 2 Over 20.0MPa 1 / 2is less than or equal to the hydrogen bond strength term δ h is 14.0 MPa 1 / 2 Because the above conditions are met, the ionic liquid and ionic surfactant have excellent compatibility with the betaine polymer, and therefore, aggregation of the betaine polymer can be suppressed or reduced. As a result, clouding of the coating film that may occur due to aggregation of the betaine polymer can be suppressed or reduced, and the cohesive force between the betaine polymers can be further alleviated. Therefore, the coating agent of [1] can suppress or reduce clouding of the coating layer that may occur due to aggregation of the betaine polymer, and can suppress or reduce the occurrence of cracks in the coating film.

[0014] In the present invention, the following configurations [2] to

[15] are preferred. [2] The polymer is formed by polymerizing at least a monomer represented by formula I, [ka] In the formula I, R 1 is a (meth)acryloylaminoalkyl group having an alkyl group with 1 to 4 carbon atoms, or a (meth)acryloyloxyalkyl group having an alkyl group with 1 to 4 carbon atoms, and R 2 and R 3 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, or a (meth)acryloyloxyalkyl group having an alkyl group with 1 to 4 carbon atoms, and R 4 is an alkylene group having 1 to 4 carbon atoms or an oxyalkylene group having 1 to 4 carbon atoms, [1] The coating agent according to the present invention. [3] The coating agent according to [1] or [2], wherein the polymer contains at least one of a silanol group and an alkoxysilyl group. [4] The coating agent according to any one of [1] to [3], which contains the ionic liquid. [5] The coating agent according to any one of [1] to [4], which contains the ionic surfactant. [6] The coating agent according to any one of [1] to [5], wherein the ionic surfactant is an anionic surfactant. [7] Water and and an alcohol-based solvent, The coating agent according to any one of [1] to [6]. [8] The coating agent according to any one of [1] to [7], further comprising a silicone-based leveling agent. [9] The coating agent according to any one of [1] to [8], which is used to coat a substrate film.

[10] A base film; and a coating layer formed on the substrate film using the coating agent according to any one of [1] to [9]. film.

[11] The film according to

[10] , wherein the base film contains at least one of polyolefin and polyester.

[12] The film according to

[10] or

[11] , which is used as a packaging film.

[13] The film according to any one of

[10] to

[12] , which is used as a pouch film.

[14] A pouch comprising the film according to any one of

[10] to

[13] .

[15] The pouch according to

[14] , which is a stoma pouch.

[0015] The present invention also preferably has the following configuration.

[16] R 1 The coating agent, film, or pouch according to any one of the above configurations, wherein the alkyl group is a (meth)acryloylaminoalkyl group having 1 to 4 carbon atoms.

[17] R 1The coating agent, film, or pouch according to any one of the above configurations, wherein the alkyl group is a methacryloyloxyalkyl group having 1 to 4 carbon atoms.

[18] R 2 and R 3 and each independently represent an alkyl group having 1 to 4 carbon atoms.

[19] R 4 is an alkylene group having 1 to 4 carbon atoms.

[20] The coating agent, film, or pouch according to any one of the preceding configurations, wherein the content of the betaine polymer in the coating agent is 30% by mass or more and 90% by mass or less, when the total content of the betaine polymer, the ionic liquid, and the ionic surfactant is 100% by mass. [twenty one] The coating agent, film, or pouch according to any one of the preceding configurations, wherein the content of the betaine polymer in the coating agent is 30% by mass or more and 90% by mass or less, when the total content of the betaine polymer and the ionic liquid is 100% by mass. [twenty two] The coating agent, film, or pouch according to any one of the preceding configurations, wherein the content of the betaine polymer in the coating agent is 30% by mass or more and 90% by mass or less, when the total content of the betaine polymer and the ionic surfactant is 100% by mass. [twenty three] 2. The coating, film, or pouch of any preceding claim, wherein the ionic liquid comprises a bis(fluorosulfonyl)imide anion. [twenty four] 10. The coating, film, or pouch of any of the preceding configurations, wherein the ionic liquid comprises a 1-ethyl-3-methylimidazolium cation. [twenty five] 10. The coating, film, or pouch of any of the preceding configurations, wherein the ionic liquid comprises an ammonium cation.

[26] 2. The coating, film, or pouch of any of the preceding configurations, wherein the ionic liquid comprises N,N-dimethyl-N,N-dihydroxyethylammonium cations.

[27] 10. The coating, film, or pouch of any of the preceding configurations, wherein the anionic surfactant comprises an alkyl sulfate or an alkyl diphenyl ether disulfonate.

[28] The coating agent, film, or pouch according to any one of the preceding configurations, wherein the silicone-based leveling agent is a polyether-modified silicone oil.

[29] A film or pouch according to any one of the preceding configurations, wherein the coating layer has a thickness of 0.05 μm or more and 10 μm or less. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a coating agent capable of forming a coating film (i.e., a coating layer) that has excellent sliding properties for fluids (e.g., curry, sauce, ketchup, mayonnaise, feces, etc.) and that suppresses or reduces the occurrence of cracks and turbidity (specifically, turbidity due to aggregation of betaine polymers). According to the present invention, it is also possible to provide a film or a pouch that includes a coating layer that has excellent sliding properties for fluids and that suppresses or reduces the occurrence of cracks and turbidity (specifically, turbidity due to aggregation of betaine polymers, as described below). DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described in detail.

[0018] <1. Coating Agent> <1.1. Betaine polymer> The coating agent of this embodiment contains a polymer containing a monomer unit containing a betaine structure, i.e., a betaine polymer. Because the coating agent of this embodiment contains a betaine polymer, it can form a coating film, i.e., a coat layer, that has excellent sliding properties for fluids (e.g., curry, sauce, ketchup, mayonnaise, feces, etc.). This will be explained below. Because the betaine polymer contains a monomer unit containing a betaine structure, it can form a coating film that has excellent hydrophilicity. This coating film is capable of absorbing the moisture from the fluid and swelling when it comes into contact with the fluid. Therefore, this coating film can form a lubricated surface when it comes into contact with the fluid. Because this surface is lubricated, it has excellent sliding properties for fluids, i.e., excellent sliding properties. Therefore, the coating agent of this embodiment can form a coating film, i.e., a coat layer, that has excellent sliding properties for fluids.

[0019] The betaine polymer may be a polymer in which at least a betaine monomer is polymerized, i.e., the betaine polymer may be a polymer in which a monomer containing a betaine monomer is polymerized.

[0020] Examples of betaine monomers include sulfoxybetaine monomers, carboxybetaine monomers, and phosphorylbetaine monomers. Among these, sulfoxybetaine monomers are preferred. These may be used alone or in combination of two or more.

[0021] Preferably, the betaine monomer contains a (meth)acryloyl group. Here, "(meth)acryloyl" means "acryloyl" or "methacryloyl." When the betaine monomer contains a (meth)acryloyl group, the betaine polymer can be an acrylic polymer.

[0022] As a sulfoxybetaine monomer containing a (meth)acryloyl group, the monomer represented by formula I is preferred because it is readily available. [ka] In Formula I, R 1 R is a (meth)acryloylaminoalkyl group having an alkyl group with 1 to 4 carbon atoms, or a (meth)acryloyloxyalkyl group having an alkyl group with 1 to 4 carbon atoms. 2 and R 3 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, or a (meth)acryloyloxyalkyl group having an alkyl group with 1 to 4 carbon atoms. 4 is an alkylene group having 1 to 4 carbon atoms or an oxyalkylene group having 1 to 4 carbon atoms.

[0023] R 1 is a (meth)acryloylaminoalkyl group having 1 to 4 carbon atoms in the alkyl group, or a (meth)acryloyloxyalkyl group having 1 to 4 carbon atoms in the alkyl group. Examples of (meth)acryloylaminoalkyl groups having 1 to 4 carbon atoms include a (meth)acryloylaminomethyl group, a (meth)acryloylaminoethyl group, a (meth)acryloylaminopropyl group, and a (meth)acryloylaminobutyl group. Examples of (meth)acryloyloxyalkyl groups having 1 to 4 carbon atoms in the alkyl group include a (meth)acryloyloxymethyl group, a (meth)acryloyloxyethyl group, a (meth)acryloyloxypropyl group, and a (meth)acryloyloxybutyl group. Of these, a (meth)acryloyloxyalkyl group having 1 to 4 carbon atoms in the alkyl group is preferred, and a methacryloyloxyalkyl group having 1 to 4 carbon atoms in the alkyl group is more preferred.

[0024] R 2 and R 3are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, or a (meth)acryloyloxyalkyl group having 1 to 4 carbon atoms in the alkyl group. Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a propyl group (e.g., an n-propyl group, an i-propyl group), and a butyl group (e.g., an n-butyl group, an i-butyl group, an s-butyl group, a t-butyl group, and a cyclobutyl group). Examples of the hydroxyalkyl group having 1 to 4 carbon atoms include a hydroxymethyl group, a hydroxyethyl group, a hydroxypropyl group, and a hydroxybutyl group. Examples of the (meth)acryloyloxyalkyl group having 1 to 4 carbon atoms in the alkyl group include a (meth)acryloylaminomethyl group, a (meth)acryloylaminoethyl group, a (meth)acryloylaminopropyl group, and a (meth)acryloylaminobutyl group. Among these, an alkyl group having 1 to 4 carbon atoms is preferred.

[0025] R 4 is an alkylene group having 1 to 4 carbon atoms, or an oxyalkylene group having 1 to 4 carbon atoms. Examples of alkylene groups having 1 to 4 carbon atoms include a methylene group, an ethylene group, a propylene group, and a butylene group. Examples of oxyalkylene groups having 1 to 4 carbon atoms include an oxymethylene group, an oxyethylene group, an oxypropylene group, and an oxybutylene group. Of these, alkylene groups having 1 to 4 carbon atoms are preferred.

[0026] In Formula I, R 1 is a (meth)acryloyloxyalkyl group having 1 to 4 carbon atoms in the alkyl group, and R 2 and R 3 are each independently an alkyl group having 1 to 4 carbon atoms, and R 4 is preferably an alkylene group having 1 to 4 carbon atoms. 1 is a methacryloyloxyalkyl group having 1 to 4 carbon atoms in the alkyl group, and R 2 and R 3 are each independently an alkyl group having 1 to 4 carbon atoms, and R 4is also preferably an alkylene group having 1 to 4 carbon atoms. Specific examples of the monomer represented by formula I, i.e., the sulfoxybetaine monomer represented by formula I, include the compounds exemplified as sulfoxybetaine monomers in Patent Document 2 (i.e., Japanese Patent No. 6467226).

[0027] An example of a carboxybetaine monomer is the monomer represented by formula II: [ka] In Formula II, R 5 and R 6 are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. 7 R is a (meth)acryloyloxyalkyl group having 1 to 4 carbon atoms in the alkyl group. 8 is an alkylene group having 1 to 4 carbon atoms.

[0028] R 5 and R 6 are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a propyl group, and a butyl group.

[0029] R 7 is a (meth)acryloyloxyalkyl group having 1 to 4 carbon atoms in the alkyl group. Examples of the (meth)acryloyloxyalkyl group having an alkyl group of 1 to 4 carbon atoms include a (meth)acryloyloxymethyl group, a (meth)acryloyloxyethyl group, a (meth)acryloyloxypropyl group, and a (meth)acryloyloxybutyl group.

[0030] R 8 is an alkylene group having 1 to 4 carbon atoms. Examples of the alkylene group having 1 to 4 carbon atoms include a methylene group, an ethylene group, a propylene group, and a butylene group.

[0031] An example of a phosphoryl betaine monomer is the monomer represented by formula III: [ka] In Formula III, R 9 R is a (meth)acryloyloxyalkyl group having 1 to 4 carbon atoms in the alkyl group. 10 is an alkylene group having 1 to 4 carbon atoms. 11 , R 12 and R 13 are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

[0032] R 9 is a (meth)acryloyloxyalkyl group having an alkyl group with 1 to 4 carbon atoms. Examples of the (meth)acryloyloxyalkyl group having an alkyl group with 1 to 4 carbon atoms include a (meth)acryloyloxymethyl group, a (meth)acryloyloxyethyl group, a (meth)acryloyloxypropyl group, and a (meth)acryloyloxybutyl group.

[0033] R 10 is an alkylene group having 1 to 4 carbon atoms. Examples of the alkylene group having 1 to 4 carbon atoms include a methylene group, an ethylene group, a propylene group, and a butylene group.

[0034] R 11 , R 12 and R 13 are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a propyl group, and a butyl group.

[0035] The betaine polymer may contain a monomer unit other than the monomer unit containing a betaine structure, i.e., the betaine polymer may be a polymer obtained by polymerizing a monomer other than a betaine monomer.

[0036] Examples of monomers other than betaine monomers include styrene, α-hydroxystyrene, p-hydroxystyrene, methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, neopentyl (meth)acrylate, cyclohexyl (meth)acrylate, benzyl (meth)acrylate, octyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, cetyl (meth)acrylate, ethyl carbitol (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, and methyl acrylate. Examples include methoxyethyl acrylate, methoxybutyl (meth)acrylate, N-methyl(meth)acrylamide, N-ethyl(meth)acrylamide, N-propyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N-butoxymethyl(meth)acrylamide, N-tert-butyl(meth)acrylamide, N-octyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, (meth)acryloylmorpholine, diacetone(meth)acrylamide, styrene, methyl itaconate, ethyl itaconate, vinyl acetate, vinyl propionate, N-vinylpyrrolidone, and N-vinylcaprolactam. These may be used alone or in combination of two or more.

[0037] When all the monomer units in the betaine polymer are taken as 100 mol %, the monomer units containing a betaine structure are preferably 80 mol % or more, more preferably 90 mol % or more, and even more preferably 95 mol % or more.

[0038] The betaine polymer preferably contains at least one of a silanol group and an alkoxysilyl group, more preferably a silanol group, which allows crosslinking between betaine polymers and thereby improves the durability of the coating film.

[0039] To obtain a betaine polymer containing at least one of a silanol group and an alkoxysilyl group, for example, monomers containing a betaine monomer may be polymerized in the presence of a chain transfer agent containing a compound containing an alkoxysilyl group.

[0040] An example of a compound containing an alkoxysilyl group is a compound represented by formula IV. [ka] In Formula IV, R 14 , R 15 and R 16 are each independently an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and R 14 , R 15 and R 16 At least one of R is an alkoxy group having 1 to 4 carbon atoms. 17 represents an alkylene group having 1 to 12 carbon atoms.

[0041] R 14 , R 15 and R 16 are each independently an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms. Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a propyl group, and a butyl group. Examples of the alkoxy group having 1 to 4 carbon atoms include a methoxy group, an ethoxy group, a propoxy group (e.g., an n-propoxy group, an i-propoxy group), and a butoxy group (e.g., an n-butoxy group, an i-butoxy group, an s-butoxy group, and a t-butoxy group).

[0042] R 14 , R 15 and R 16 At least one of R is an alkoxy group having 1 to 4 carbon atoms. 14 , R 15 and R 16 Preferably, at least one of the groups is a methoxy group.

[0043] R 14 , R 15 and R 16 It is preferable that at least two of the R groups are alkoxy groups having 1 to 4 carbon atoms. When at least two of the R groups are alkoxy groups having 1 to 4 carbon atoms, it is believed that the durability of the coating film can be further improved. 14 , R 15 and R 16 More preferably, at least two of the groups are methoxy groups.

[0044] R 14 , R 15 and R 16 It is preferable that all of R are alkoxy groups having 1 to 4 carbon atoms. When all of R are alkoxy groups having 1 to 4 carbon atoms, it is believed that the durability of the coating film can be further improved. 14 , R 15 and R 16 More preferably, all of are methoxy groups.

[0045] R 17 represents an alkylene group having 1 to 12 carbon atoms. The number of carbon atoms in the alkylene group is preferably 2 or more, and more preferably 3 or more. The number of carbon atoms in the alkylene group is preferably 6 or less, more preferably 4 or less, and even more preferably 3. Examples of the alkylene group having 1 to 12 carbon atoms include a methylene group, an ethylene group, a propylene group, and a butylene group.

[0046] An example of the compound represented by formula IV is 3-mercaptopropyltrimethoxysilane.

[0047] The amount of the alkoxysilyl group-containing compound added is preferably 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, and even more preferably 0.3 parts by mass or more, relative to 100 parts by mass of the monomer, while the amount of the alkoxysilyl group-containing compound added may be, for example, 5.0 parts by mass or less, 3.0 parts by mass or less, 2.0 parts by mass or less, or 1.0 part by mass or less.

[0048] It is preferable to polymerize the monomers in the presence of a polymerization initiator. Examples of the polymerization initiator include azoisobutyronitrile, methyl azoisobutyrate, azobisdimethylvaleronitrile, benzoyl peroxide, potassium persulfate, ammonium persulfate, benzophenone derivatives, phosphine oxide derivatives, benzoketone derivatives, phenylthioether derivatives, azide derivatives, diazo derivatives, and disulfide derivatives. These may be used alone or in combination of two or more.

[0049] The amount of the polymerization initiator added can be, for example, 0.01 to 5 parts by mass relative to 100 parts by mass of the monomer.

[0050] One example of a polymerization method is solution polymerization. Examples of solvents that can be used in solution polymerization include alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, ethylene glycol, and propylene glycol; ketones such as acetone and methyl ethyl ketone; ethers such as diethyl ether and tetrahydrofuran; aromatic hydrocarbon compounds such as benzene, toluene, and xylene; aliphatic hydrocarbon compounds such as n-hexane; alicyclic hydrocarbon compounds such as cyclohexane; acetate esters such as methyl acetate and ethyl acetate; and water. These solvents may be used alone or in combination of two or more. The monomer concentration, polymerization temperature, polymerization time, and the like can be appropriately set. The polymerization may be carried out under an inert gas. Examples of inert gases include nitrogen gas and argon gas.

[0051] The weight-average molecular weight of the betaine polymer is preferably 10,000 or more, and more preferably 50,000 or more. On the other hand, the weight-average molecular weight of the betaine polymer may be, for example, 1,000,000 or less, or 500,000 or less. The weight-average molecular weight of the betaine polymer is a value measured by gel permeation chromatography.

[0052] The content of the betaine polymer in the coating agent of this embodiment is determined by the ratio of the betaine polymer and the ionic liquid (specifically, the London dispersion term δ d is 10.0 MPa 1 / 2 Over 18.3MPa 1 / 2 and the dipole-dipole force term δ p is 10.0 MPa 1 / 2 Over 20.0MPa 1 / 2 is less than or equal to the hydrogen bond strength term δ h is 14.0 MPa 1 / 2 ionic liquids, and ionic surfactants (specifically, the London dispersion term δ d is between 10.0 and 18.3, and the dipole-dipole force term δ p is 10.0 or more and 20.0 or less, and the hydrogen bonding strength term δ h When the total content of the betaine polymer (ionic surfactants having a molecular weight of less than 1,000 and a molecular weight of 14.0 or less) is taken as 100% by mass, the betaine polymer content is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, and even more preferably 60% by mass or more. A betaine polymer content of 30% by mass or more can form a coating film with even better hydrophilicity and slip-off properties. The betaine polymer content may be, for example, 70% by mass or more, or even 80% by mass or more. On the other hand, when the total content of the betaine polymer, the ionic liquid described below, and the ionic surfactant described below is taken as 100% by mass, the betaine polymer content in the coating agent of this embodiment is preferably 90% by mass or less, more preferably 87% by mass or less, and even more preferably 85% by mass or less. When the betaine polymer content is 90% by mass or less, the cloudiness of the coating layer that may occur due to aggregation of the betaine polymer can be further suppressed or reduced, and the occurrence of cracks in the coating film can be further suppressed or reduced.

[0053] The content of the betaine polymer in the coating agent of this embodiment is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, and even more preferably 60% by mass or more, when the total content of the betaine polymer and the ionic liquid described below is taken as 100% by mass. The content of the betaine polymer may be, for example, 70% by mass or more, or even 80% by mass or more. On the other hand, the content of the betaine polymer in the coating agent of this embodiment is preferably 90% by mass or less, more preferably 87% by mass or less, and even more preferably 85% by mass or less, when the total content of the betaine polymer and the ionic liquid described below is taken as 100% by mass.

[0054] The content of the betaine polymer in the coating agent of this embodiment is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, and even more preferably 60% by mass or more, when the total content of the betaine polymer and the ionic surfactant described below is taken as 100% by mass. The content of the betaine polymer may be, for example, 70% by mass or more, or even 80% by mass or more. On the other hand, the content of the betaine polymer in the coating agent of this embodiment is preferably 90% by mass or less, more preferably 87% by mass or less, and even more preferably 85% by mass or less, when the total content of the betaine polymer and the ionic surfactant described below is taken as 100% by mass.

[0055] <1.2. Ionic Liquids> The coating agent of this embodiment is an ionic liquid, specifically, a liquid having a London dispersion force term δ in the Hansen solubility parameter (HSP). d is 10.0 MPa 1 / 2 Over 18.3MPa 1 / 2 and the dipole-dipole force term δ p is 10.0 MPa 1 / 2 Over 20.0MPa 1 / 2 is less than or equal to the hydrogen bond strength term δ h is 14.0 MPa 1 / 2It is preferable that the coating agent contains the following ionic liquid: Since the coating agent contains this ionic liquid, it is possible to suppress or reduce cloudiness that can occur due to aggregation of the betaine polymer, and it is also possible to suppress or reduce the occurrence of cracks in the coating film.

[0056] Here, the Hansen solubility parameter (HSP) refers to a vector parameter obtained by dividing the Hildebrand solubility parameter into three cohesive energy components: London dispersion force, dipole-dipole force, and hydrogen bond force. Here, the component corresponding to the London dispersion force of the HSP is called the dispersion term δ d , or the London dispersion force term δ d The component corresponding to the dipole-dipole force of HSP is called the polar term δ p , or the dipole-dipole force term δ p The component corresponding to the hydrogen bond strength of HSP is called the hydrogen bond term δ h , or hydrogen bond strength term δ h It is sometimes called.

[0057] HSP can be determined by the Hansen dissolving sphere method. In the Hansen dissolving sphere method, first, a sample (specifically, an ionic liquid or an ionic surfactant, as described below) is mixed with various solvents with known HSPs, and whether the sample is dissolved in each solvent is determined. Next, the London dispersion force term δ d , dipole-dipole force term δ p , and the hydrogen bond strength term δ h The London dispersion force terms δ of these solvents are d , dipole-dipole force term δ p , and the hydrogen bond strength term δ h Based on the three-dimensional graph on which these are plotted, the smallest sphere that includes the coordinates of the solvent in which the sample is dissolved (i.e., the good solvent) and does not include the coordinates of the solvent in which the sample is not dissolved (i.e., the poor solvent), i.e., the Hansen dissolution sphere, is created. The coordinates of the center of the Hansen dissolution sphere can be determined as the HSP of the sample. Specifically, the HSP can be determined by the method described in the Examples below.

[0058] London dispersion term δ of HSPd is 11.0 MPa 1 / 2 More than 11.5MPa is preferable. 1 / 2 On the other hand, the London dispersion force term δ d For example, 17.0 MPa 1 / 2 It may be less than 16.0 MPa 1 / 2 It may be the following:

[0059] HSP dipole-dipole force term δ p For example, 11.0 MPa 1 / 2 or more, 13.0 MPa 1 / 2 On the other hand, the dipole-dipole force term δ p is, for example, 19.5 MPa 1 / 2 It may be less than 19.0 MPa 1 / 2 It may be the following:

[0060] HSP hydrogen bond term δ h is 6.0 MPa 1 / 2 More than 7.0MPa is preferable. 1 / 2 On the other hand, the hydrogen bonding strength term δ h is, for example, 13.5 MPa 1 / 2 It may be less than 13.0 MPa 1 / 2 It may be the following:

[0061] Ionic liquids contain cations and anions. The combination of cations and anions is such that the ionic liquid has a melting point of 100°C or less and also satisfies the Hansen solubility parameters described above. Ionic liquids are salts with a melting point of 100°C or less. Ionic liquids are sometimes called low-melting-point molten salts because they become liquid at a relatively low temperature compared to common inorganic salts. Examples of methods for synthesizing ionic liquids include the anion exchange method, the acid ester method, and the neutralization method.

[0062] The anion of the ionic liquid may be an inorganic anion or an organic anion. Specifically, the anion may be, for example, Cl. - , Br - , I -, AlCl4 - , Al2Cl7 - , BF4 - , PF6 - , ClO4 - , NO3 - , CH3COO - , CF3COO - , CH3SO3 - , CF3SO3 - , C4F9SO3 - , (CF3SO2)2N - , (C2F5SO2)2N - , (C3F7SO2)2N - , (C4F9SO2)2N - , (CF3SO2)3C - , AsF6 - , SbF6 - , NbF6 - , TaF6 - , F(HF) n - , (CN)2N - , C4F9SO3 - , (C2F5SO2)2N - , C3F7COO - , (CF3SO2)(CF3CO)N - , C9H 19 COO - , (CH3)2PO4 - , (C2H5)2PO4 - , C2H5OSO3 - , C6H 13 OSO3 - , C8H 17 OSO3 - , CH3(OC2H4)2OSO3 - , C6H4(CH3)SO3 - , (C2F5)3PF3 - , CH3CH(OH)COO - , (FSO2)2N - Among them, (FSO2)2N is preferred from the viewpoint of excellent compatibility with betaine polymers. - That is, bis(fluorosulfonyl)imide anion (hereinafter sometimes referred to as "FSI") is preferred.

[0063] Examples of cations in ionic liquids include: pyridinium cations such as 1-ethylpyridinium cation, 1-butylpyridinium cation, 1-hexylpyridinium cation, 1-butyl-3-methylpyridinium cation, 1-butyl-4-methylpyridinium cation, 1-hexyl-3-methylpyridinium cation, and 1-butyl-3,4-dimethylpyridinium cation; pyrrolidinium cations such as 1,1-dimethylpyrrolidinium cation, 1-ethyl-1-methylpyrrolidinium cation, 1-methyl-1-propylpyrrolidinium cation, 1-methyl-1-butylpyrrolidinium cation, 1-methyl-1-pentylpyrrolidinium cation, 1-methyl-1-hexylpyrrolidinium cation, 1-methyl-1-heptylpyrrolidinium cation, 1-ethyl-1-propylpyrrolidinium cation, 1-ethyl-1-butylpyrrolidinium cation, 1-ethyl-1-pentylpyrrolidinium cation, 1-ethyl-1-hexylpyrrolidinium cation, 1-ethyl-1-heptylpyrrolidinium cation, 1,1-dipropylpyrrolidinium cation, 1-propyl-1-butylpyrrolidinium cation, 1,1-dibutylpyrrolidinium cation, and pyrrolidinium-2-one cation; piperidinium cations such as 1-propylpiperidinium cation, 1-pentylpiperidinium cation, 1,1-dimethylpiperidinium cation, 1-methyl-1-ethylpiperidinium cation, 1-methyl-1-propylpiperidinium cation, 1-methyl-1-butylpiperidinium cation, 1-methyl-1-pentylpiperidinium cation, 1-methyl-1-hexylpiperidinium cation, 1-methyl-1-heptylpiperidinium cation, 1-ethyl-1-propylpiperidinium cation, 1-ethyl-1-butylpiperidinium cation, 1-ethyl-1-pentylpiperidinium cation, 1-ethyl-1-hexylpiperidinium cation, 1-ethyl-1-heptylpiperidinium cation, 1,1-dipropylpiperidinium cation, 1-propyl-1-butylpiperidinium cation, and 1,1-dibutylpiperidinium cation; Cations having a pyrroline skeleton, such as 2-methyl-1-pyrroline cation; Cations having a pyrrole skeleton, such as 1-ethyl-2-phenylindole cation, 1,2-dimethylindole cation, and 1-ethylcarbazole cation; morpholinium cations such as N-ethyl-N-methylmorpholinium cation; 1,3-dimethylimidazolium cation, 1,3-diethylimidazolium cation, 1-ethyl-3-methylimidazolium cation, 1-butyl-3-methylimidazolium cation, 1-hexyl-3-methylimidazolium cation, 1-octyl-3-methylimidazolium cation, 1-decyl-3-methylimidazolium cation, 1-dodecyl-3-methylimidazolium cation, 1-tetradecyl-3-methylimidazolium cation imidazolium cations such as midazolium cation, 1,2-dimethyl-3-propylimidazolium cation, 1-ethyl-2,3-dimethylimidazolium cation, 1-butyl-2,3-dimethylimidazolium cation, 1-hexyl-2,3-dimethylimidazolium cation, 1-(2-methoxyethyl)-3-methylimidazolium cation, and 1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation; tetrahydropyrimidinium cations such as 1,2,3-trimethyl-1,4,5,6-tetrahydropyrimidinium cation, 1,2,3,4-tetramethyl-1,4,5,6-tetrahydropyrimidinium cation, and 1,2,3,5-tetramethyl-1,4,5,6-tetrahydropyrimidinium cation; dihydropyrimidinium cations such as 1,3-dimethyl-1,4-dihydropyrimidinium cation, 1,3-dimethyl-1,6-dihydropyrimidinium cation, 1,2,3-trimethyl-1,4-dihydropyrimidinium cation, 1,2,3-trimethyl-1,6-dihydropyrimidinium cation, 1,2,3,4-tetramethyl-1,4-dihydropyrimidinium cation, and 1,2,3,4-tetramethyl-1,6-dihydropyrimidinium cation; pyrazolium cations such as 1-methylpyrazolium cation, 3-methylpyrazolium cation, 1-ethyl-2,3,5-trimethylpyrazolium cation, 1-propyl-2,3,5-trimethylpyrazolium cation, and 1-butyl-2,3,5-trimethylpyrazolium cation; pyrazolinium cations such as 1-ethyl-2-methylpyrazolinium cation, 1-ethyl-2,3,5-trimethylpyrazolinium cation, 1-propyl-2,3,5-trimethylpyrazolinium cation, and 1-butyl-2,3,5-trimethylpyrazolinium cation; trialkylsulfonium cations such as trimethylsulfonium cation, triethylsulfonium cation, tributylsulfonium cation, trihexylsulfonium cation, diethylmethylsulfonium cation, dibutylethylsulfonium cation, and dimethyldecylsulfonium cation; tetraalkylphosphonium cations such as tetramethylphosphonium cation, tetraethylphosphonium cation, tetrabutylphosphonium cation, tetrahexylphosphonium cation, tetraoctylphosphonium cation, triethylmethylphosphonium cation, tributylethylphosphonium cation, trimethyldecylphosphonium cation, and tributyl-(2-methoxyethyl)phosphonium cation; Tetramethylammonium cation, tetraethylammonium cation, tetrabutylammonium cation, tetrapentylammonium cation, tetrahexylammonium cation, tetraheptylammonium cation, triethylmethylammonium cation, tributylethylammonium cation, trimethyldecylammonium cation, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium cation, glycidyltrimethylammonium cation, diallyldimethylammonium cation, N,N-dimethyl-N-ethyl-N-propylammonium cation, N,N-dimethyl-N-ethyl-N-butylammonium cation, N,N-dimethyl-N-ethyl-N-pentylammonium cation, N,N-dimethyl-N-ethyl-N-hexylammonium cation, N,N-dimethyl-N-ethyl-N-heptylammonium cation, N,N-dimethyl-N-ethyl-N-nonylammonium cation, N,N-dimethyl-N,N-dipropylammonium cation, N,N-diethyl-N-propyl-N-butylammonium cation, N,N- Dimethyl-N-propyl-N-pentylammonium cation, N,N-dimethyl-N-propyl-N-hexylammonium cation, N,N-dimethyl-N-propyl-N-heptylammonium cation, N,N-dimethyl-N-butyl-N-hexylammonium cation, N,N-diethyl-N-butyl-N-heptylammonium cation, N,N-dimethyl-N-pentyl-N-hexylammonium cation, N,N-dimethyl-N,N-dihexylammonium cation, trimethylheptylammonium cation, N,N-diethyl N,N-diethyl-N-methyl-N-propylammonium cation, N,N-diethyl-N-methyl-N-pentylammonium cation, N,N-diethyl-N-methyl-N-heptylammonium cation, N,N-diethyl-N-propyl-N-pentylammonium cation, triethylpropylammonium cation, triethylpentylammonium cation, triethylheptylammonium cation, N,N-dipropyl-N-methyl-N-ethylammonium cation, N,N-dipropyl-N-methyl-N-pentylammonium cation, N,Ammonium cations such as N-dipropyl-N-butyl-N-hexylammonium cation, N,N-dipropyl-N,N-dihexylammonium cation, N,N-dibutyl-N-methyl-N-pentylammonium cation, N,N-dibutyl-N-methyl-N-hexylammonium cation, trioctylmethylammonium cation, N-methyl-N-ethyl-N-propyl-N-pentylammonium cation, and N,N-dimethyl-N,N-dihydroxyethylammonium cation; Among these, imidazolium cations and ammonium cations are preferred from the viewpoint of high compatibility with betaine polymers, and 1-ethyl-3-methylimidazolium cation (hereinafter sometimes referred to as "EMIM") and N,N-dimethyl-N,N-dihydroxyethylammonium cation (hereinafter sometimes referred to as "DDEA") are more preferred.

[0064] A specific example of an ionic liquid is a combination of 1-ethyl-3-methylimidazolium cation (i.e., EMIM) and bis(fluorosulfonyl)imide anion (i.e., FSI) from the viewpoint of excellent compatibility with betaine polymers. On the other hand, a combination of an ammonium cation and bis(fluorosulfonyl)imide anion (i.e., FSI) is also preferred from the viewpoint of excellent compatibility with betaine polymers. Of these, a combination of N,N-dimethyl-N,N-dihydroxyethylammonium cation (i.e., DDEA) and FSI is more preferred. The ionic liquids may be used alone or in combination of two or more.

[0065] <1.3. Ionic surfactants> The coating agent of the present embodiment is an ionic surfactant having a molecular weight of less than 1000, specifically, a London dispersion force term δ in the Hansen solubility parameter (HSP) d is between 10.0 and 18.3, and the dipole-dipole force term δ p is 10.0 or more and 20.0 or less, and the hydrogen bonding strength term δ hIt is preferable that the surfactant contains an ionic surfactant having a molecular weight of less than 1000 and a molecular weight of 14.0 or less.

[0066] The explanation of the HSP of ionic surfactants is omitted here because it overlaps with the explanation above (i.e., the explanation of the HSP of ionic liquids). Therefore, the explanation of the HSP of ionic liquids can also be used as an explanation of the HSP of ionic surfactants.

[0067] The molecular weight of the ionic surfactant is less than 1000. Ionic surfactants with a molecular weight of less than 1000 have the advantage that there are many types and therefore a wide range of options to choose from.

[0068] Examples of ionic surfactants having a molecular weight of less than 1000 include anionic surfactants, cationic surfactants, and amphoteric surfactants. Among these, anionic surfactants are preferred because they can easily reduce the cohesive force of the betaine polymer.

[0069] Examples of anionic surfactants include alkyl sulfates, alkyl ether sulfates, alkyl monoglyceryl ether sulfates, alkyl sulfonates, alkylaryl sulfonates, alkyl diphenyl ether disulfonates, alkyl sulfosuccinates, alkyl ether sulfosuccinates, alkyl sulfosuccinates, alkyl amide sulfosuccinates, alkyl carboxylates, alkyl amide ether carboxylates, alkyl succinates, fatty acyl sarcosinates, fatty acyl amino acids, fatty acyl taurates, fatty alkyl sulfoacetates, and alkyl phosphate esters.Among these, alkyl sulfates, alkyl ether sulfates, alkyl monoglyceryl ether sulfates, alkyl sulfonates, alkyl diphenyl ether disulfonates, alkyl sulfosuccinates, and alkyl ether sulfosuccinates are preferred.Because of their high compatibility with betaine polymers, alkyl sulfates and alkyl diphenyl ether disulfonates are preferred.Examples of alkyl sulfates include sodium lauryl sulfate, sodium laureth sulfate, and ammonium laureth sulfate. An example of an alkyl diphenyl ether disulfonate is sodium alkyl diphenyl ether disulfonate. The anionic group of the anionic surfactant may be, for example, a sulfonic acid group, a carboxyl group, or a salt thereof. Therefore, the anionic group may be, for example, -SO3 - Group, -OSO3 - group, -COO - It can be a group.

[0070] <1.4. Leveling Agent> The coating agent of this embodiment preferably contains a silicone-based leveling agent, which can effectively reduce the surface tension of the coating agent and the interfacial tension between the coating agent and the object to be coated (e.g., a substrate film), thereby suppressing the occurrence of repelling.

[0071] Examples of silicone leveling agents include polyether-modified silicone oil and polyglycerin-modified silicone oil, with polyether-modified silicone oil being preferred.

[0072] An example of the polyether-modified silicone oil is a compound represented by the following formula: R3SiO(R2SiO) m (RR e SiO) n SiR3 Each R is independently an alkyl group having 1 to 4 carbon atoms. e are each independently a group containing a polyether group (hereinafter sometimes referred to as an "introduced group").

[0073] Each R is independently an alkyl group having 1 to 4 carbon atoms. Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a propyl group, and a butyl group. Of these, it is preferable that all of the R groups are methyl groups.

[0074] R e are each independently a group containing a polyether group. Examples of the polyether group include a polyethyleneoxy group and a polypropyleneoxy group. Examples of the polyether group include a group containing both an ethyleneoxy group (EO) and a propyleneoxy group (PO). In this case, the ethyleneoxy groups (EO) and the propyleneoxy groups (PO) may be arranged in a block form or randomly. Each R e The polyether group may be linked to Si via a linking group. An example of the linking group is an alkylene group. The alkylene group may have, for example, 1 to 4 carbon atoms. Examples of alkylene groups having 1 to 4 carbon atoms include a methylene group, an ethylene group, a propylene group, and a butylene group.

[0075] The compound represented by this formula can be called a side-chain type polyether-modified silicone oil. The side-chain type polyether-modified silicone oil can include a main chain in which SiO is repeatedly arranged, a plurality of first side chains branched from the main chain, and a plurality of second side chains branched from the main chain. Each of the first side chains can be independently an alkyl group having 1 to 4 carbon atoms (see the description of R). Each of the second side chains can be independently a group containing a polyether group (R e (See explanation below).

[0076] The content of the silicone leveling agent in the coating agent of this embodiment is preferably 0.02 parts by mass or more, more preferably 0.05 parts by mass or more, even more preferably 0.10 parts by mass or more, and even more preferably 0.15 parts by mass or more, relative to 100 parts by mass of the betaine polymer. On the other hand, the content of the silicone leveling agent in the coating agent of this embodiment is preferably 3.0 parts by mass or less, more preferably 2.0 parts by mass or less, even more preferably 1.5 parts by mass or less, and even more preferably 1.0 part by mass or less.

[0077] The content of the silicone-based leveling agent is preferably 0.002% by mass or more, more preferably 0.005% by mass or more, relative to 100% by mass of the coating agent of this embodiment. On the other hand, the content of the silicone-based leveling agent may be, for example, 0.3% by mass or less, 0.2% by mass or less, 0.1% by mass or less, or 0.05% by mass or less.

[0078] 1.5. Solvents The coating agent of this embodiment contains a solvent. Examples of the solvent include water, alcohol-based solvents, ketone-based solvents, amide-based solvents, and ether-based solvents. Among these, alcohol-based solvents are preferred. When the solvent contains an alcohol-based solvent, the occurrence of cissing can be further suppressed. In particular, cissing that can occur when a coating film is formed with the coating agent on a substrate film with relatively high hydrophobicity (e.g., a polyolefin film such as a polyethylene film or a polypropylene film) can be further suppressed. Examples of alcohol-based solvents include methanol, isopropyl alcohol, n-butanol, diacetone alcohol, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, and tertiary amyl alcohol. Water is also preferred as the solvent. In particular, it is more preferred that the solvent contains both water and an alcohol-based solvent.

[0079] The content of the alcohol-based solvent in the coating agent of this embodiment is preferably 5% by mass or more, more preferably 10% by mass or more, based on 100% by mass of the solvent. On the other hand, the content of the alcohol-based solvent may be, for example, 50% by mass or less, 30% by mass or less, or 25% by mass or less.

[0080] When the coating agent of this embodiment contains water and an alcohol-based solvent, the total content of water and alcohol-based solvent is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and even more preferably 97% by mass or more, based on 100% by mass of the solvent. The total content of water and alcohol-based solvent may be 98% by mass or more, 99% by mass or more, or even 100% by mass, based on 100% by mass of the solvent.

[0081] The content of the solvent is preferably 25% by mass or more, more preferably 50% by mass or more, and even more preferably 70% by mass or more, based on 100% by mass of the coating agent of this embodiment. On the other hand, the content of the solvent may be, for example, 99% by mass or less, or 95% by mass or less.

[0082] <1.6.Other> The coating agent of this embodiment may further contain a polymer other than the betaine polymer. d is 10.0 MPa 1 / 2 Over 18.3MPa 1 / 2 and the dipole-dipole force term δ p is 10.0 MPa 1 / 2 Over 20.0MPa 1 / 2 is less than or equal to the hydrogen bond strength term δ h is 14.0 MPa 1 / 2 The coating agent of the present embodiment may further contain an ionic liquid other than the above-mentioned ionic surfactant (specifically, an ionic liquid having a London dispersion force term δ d is between 10.0 and 18.3, and the dipole-dipole force term δ p is 10.0 or more and 20.0 or less, and the hydrogen bonding strength term δ h The coating agent of the present embodiment may further contain an ionic surfactant other than an ionic surfactant having a molecular weight of less than 1,000 and a molecular weight of 14.0 or less. The coating agent of the present embodiment may further contain an antioxidant, an ultraviolet absorber, a light stabilizer, a fluorine compound (for example, a fluorine-based leveling agent), etc.

[0083] In the coating agent of the present embodiment, the betaine polymer and the above-mentioned ionic liquid (specifically, the London dispersion term δ d is 10.0 MPa 1 / 2 Over 18.3MPa 1 / 2 and the dipole-dipole force term δ p is 10.0 MPa 1 / 2 Over 20.0MPa 1 / 2 is less than or equal to the hydrogen bond strength term δ h is 14.0 MPa 1 / 2 the ionic liquid (specifically, the London dispersion term δ d is between 10.0 and 18.3, and the dipole-dipole force term δ p is 10.0 or more and 20.0 or less, and the hydrogen bonding strength term δ hThe total content of the ionic surfactant (having a molecular weight of less than 1,000 and a molecular weight of 14.0 or less) and the solvent is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and even more preferably 97% by mass or more. This total content may be 98% by mass or more, 99% by mass or more, or even 100% by mass.

[0084] <1.7. Manufacturing method and uses> The coating agent of the present embodiment is, for example, a mixture of a betaine polymer and the above-mentioned ionic liquid (specifically, a London dispersion term δ d is 10.0 MPa 1 / 2 Over 18.3MPa 1 / 2 and the dipole-dipole force term δ p is 10.0 MPa 1 / 2 Over 20.0MPa 1 / 2 is less than or equal to the hydrogen bond strength term δ h is 14.0 MPa 1 / 2 ionic liquids having a London dispersion term δ d is between 10.0 and 18.3, and the dipole-dipole force term δ p is 10.0 or more and 20.0 or less, and the hydrogen bonding strength term δ h The surfactant can be produced by mixing at least one of the following: a surfactant having a molecular weight of less than 1000 and a viscosity of 14.0 or less; and a solvent, if necessary.

[0085] The coating agent of this embodiment can be suitably used to coat a substrate film. The substrate film can contain a resin. Examples of resins include polyolefin and polyester. Therefore, the substrate film may contain either a polyolefin or a polyester. Examples of polyolefins include polyethylene and polypropylene. Examples of polyesters include polyethylene terephthalate (PET) and polyethylene naphthalate (PEN). PET may be copolymerized PET. PEN may be copolymerized PEN. Polyolefins are preferred because they have a low melting point and are easy to produce into pouches by heat sealing. The substrate film may have a single layer structure or a multi-layer structure. The substrate film may be surface-treated. Examples of surface treatments include corona treatment and plasma treatment.

[0086] The coating agent of this embodiment can be applied to a substrate film and then dried as necessary to form a coating film, i.e., a coating layer, on the substrate film. When the substrate film has been surface-treated, it is preferable to apply the coating agent to the surface-treated surface. Examples of application methods include gravure coating, roll coating, dip coating, brush coating, spray coating, bar coating, knife coating, die coating, and spin coating. To accelerate the drying of the coating agent, the substrate film to which the coating agent has been applied may be heated.

[0087] <2. Films and pouches> The film of this embodiment (hereinafter sometimes referred to as a "laminated film") includes a base film and a coating layer formed on the base film. As described above, the film of this embodiment can be obtained by applying the coating agent of this embodiment to the base film and then drying it as necessary. Note that, since the coating layer of the film of this embodiment has excellent hydrophilicity, it can be said that the deterioration of heat sealability that may occur due to the formation of the coating layer is not significant.

[0088] The thickness of the substrate film may be, for example, 10 μm or more, 15 μm or more, or 20 μm or more, while the thickness of the substrate film may be, for example, 1000 μm or less, 200 μm or less, 150 μm or less, or 100 μm or less.

[0089] The thickness of the coating layer is preferably 0.05 μm or more, more preferably 0.1 μm or more, and even more preferably 0.3 μm or more. On the other hand, the thickness of the coating layer is preferably 10 μm or less, more preferably 5 μm or less, and even more preferably 3 μm or less. The thinner the coating layer, the more likely it is that a decrease in heat sealability caused by the coating layer can be avoided or reduced. In addition, the thinner the coating layer, the more likely it is that the coating layer can quickly form a lubricating surface, i.e., a surface with excellent sliding properties, when it comes into contact with a fluid.

[0090] The film of this embodiment may further include layers other than the substrate film and coating layer. Examples of layers other than the substrate film and coating layer include an adhesive layer, a nonwoven fabric layer, a printed layer, and an inorganic thin film layer. Examples of fibrous materials constituting the nonwoven fabric layer include cellulose fibers, polyamide fibers, vinylon fibers, polyester fibers, polyethylene fibers, polypropylene fibers, polyolefin fibers, and rayon fibers.

[0091] The film of this embodiment can be suitably used as a packaging film. Examples of packaging films include films for packaging medicines, food, and electronic components (such as outer packaging films for lithium-ion batteries). Among these, the film can be particularly suitably used as a food packaging film.

[0092] The film of this embodiment can be suitably used as a film for pouches. The film of this embodiment can be particularly suitably used as a film for retort pouches and stoma pouches (i.e., pouches for stoma appliances). That is, the film of this embodiment can be particularly suitably used as a film for producing retort pouches and stoma pouches.

[0093] The pouch of this embodiment includes the above-mentioned film (i.e., a film including a base film and a coating layer formed on the base film). The pouch of this embodiment can be obtained, for example, by placing the coating layers of the above-mentioned films face to face and bonding them together by heat sealing. In this case, the coating layers of one film may be placed face to face and then bonded together, or the coating layers of multiple films, for example, two films, may be placed face to face and then bonded together. In the pouch of this embodiment, a coating layer is preferably disposed on the inner surface of the pouch. In other words, the innermost layer of the pouch of this embodiment is preferably the coating layer.

[0094] The pouch of this embodiment may be, for example, a retort pouch or a stoma pouch. A stoma pouch, i.e., a pouch for a stoma appliance, is a bag that receives waste material discharged from a stoma. The stoma pouch may be provided with an opening (hereinafter sometimes referred to as an "receiving opening") for receiving waste material. The stoma pouch may further be provided with an opening for discharging waste material accumulated in the stoma pouch. The stoma appliance may include a stoma pouch and a base plate provided on the stoma pouch. The base plate may be provided around the receiving opening.

[0095] <3. Various modifications can be made to the above-described embodiment> The above-described embodiment can be modified in various ways. For example, the above-described embodiment can be modified by selecting one or more of the following modifications.

[0096] In the above-described embodiment, a configuration in which a coating agent is used to coat a substrate film has been described. However, the present embodiment is not limited to this configuration. For example, the coating agent may be used to coat a glass plate, a silicon wafer, a metal plate, or the like.

[0097] In the above-described embodiment, a configuration has been described in which the above-described film (i.e., a film including a base film and a coating layer formed on the base film) is produced, and then a pouch including a coating layer is produced. However, this embodiment is not limited to this configuration. For example, a pouch including a coating layer may be produced by coating at least a portion of the inner surface of a pouch not including a coating layer with the above-described coating agent. That is, a pouch including a coating layer may be produced by forming a coating layer with the above-described coating agent on at least a portion of the inner surface of a pouch not including a coating layer.

[0098] In the above embodiment, one or more of the above-described films are heat-sealed to form a pouch. However, the present embodiment is not limited to this configuration. For example, one or more of the above-described films may be cold-sealed using an adhesive or pressure-sensitive adhesive. [Example]

[0099] The present invention will be described in more detail below with reference to examples and comparative examples. Unless otherwise specified, "parts" means "parts by mass" and "%" means "% by mass".

[0100] <1. Raw materials> The following raw materials were used: In the following, polymers other than the betaine acrylic polymer may be referred to as ionic functional group-containing polymers. Betaine monomer: 3-((2-(Methacryloyloxy)ethyl)dimethylammonio)propane-1-sulfonate (TCI) Radical generating initiator: VA-086 (Fujifilm Wako Pure Chemical Industries, Ltd.) Chain transfer agent (reactive group introduction agent): 3-mercaptopropyltrimethoxysilane (TCI) Ionic liquid: 1-ethyl-3-methyl-imidazorium bis(fluorosulfonyl)imide (Tokyo Chemical Industry Co., Ltd.) Ionic liquid: 1-ethyl-3-methylimidazolium Acetate (Tokyo Chemical Industry Co., Ltd.) Ionic liquid: 1-ethyl-3-methylimidazolium Dimethyl Phosphate (Merck) Anionic surfactant: EMAL 2FG (Kao, 98% solids (aqueous solution), sodium lauryl sulfate) Anionic surfactant: Pelex SS-L (Kao Corporation, 50% solids concentration (aqueous solution), sodium alkyldiphenyletherdisulfonate) Anionic surfactant: Pelex TA (Kao, solids concentration 38% (aqueous solution), sodium alkylbenzenesulfonate) Leveling agent: KF-640 (Shin-Etsu Chemical Co., Ltd., polyether-modified silicone oil)

[0101] 2. Hansen Solubility Parameter (HSP) The Hansen solubility parameters (HSP) of ionic liquids and anionic surfactants were determined using the solvents shown in Table 1. Specifically, the solvents used were water (HO), glycerol (GL), formamide (FA), thiodiethylene glycol (TDEG), diiodomethane (DIM), ethylene glycol (EG), 1,1,2,2-tetrabromoethane (TBE), 1-bromonaphthalene (BN), diethylene glycol (DEG), dimethylformamide (DMF), trichloroethylene (TCE), nitromethane (NM), trans-decahydronaphthalene (TDHN), and hexane (HX). [Table 1] Specifically, 0.2 g of ionic liquid or 0.2 g of anionic surfactant was first added to 2 mL of solvent under a nitrogen atmosphere, thoroughly stirred, and then allowed to stand for 24 hours. The ionic liquid or anionic surfactant was then visually evaluated for dissolution. This allowed us to determine whether the solvent was a good or poor solvent. The results were then entered into the sphere program in Hansen Solubility Parameters in Practice (HSPiP) 5th Edition 5.0.13 software to calculate the HSP of the ionic liquid or anionic surfactant. The London dispersion term (i.e., dispersion term) δ of HSP obtained by this d , dipole-dipole force term (i.e., polar term) δ p , hydrogen bond strength term (i.e., hydrogen bond term) δ h is shown in Table 2. [Table 2]

[0102] <3. Synthesis of acrylic polymer> 10 g of betaine monomer, 0.07 g of 3-mercaptopropyltrimethoxysilane as a chain transfer agent, and 10 g of purified water were added to a 100 mL multi-neck flask. Nitrogen gas was blown directly into the solution while stirring it to remove as much oxygen as possible from the flask. Next, 0.01 g of a radical-generating initiator was added, and the contents of the multi-necked flask were heated to 70°C in an oil bath and stirred for 4 hours while maintaining the temperature at 70°C. After that, an additional 0.1 g of a radical-generating initiator was added, and the contents of the multi-necked flask were stirred for 4 hours while maintaining the temperature at 70°C. This produced a polymer solution (solid concentration 51%). The weight-average molecular weight of the acrylic polymer (hereinafter sometimes referred to as "betaine acrylic polymer") contained in the polymer solution was measured by gel permeation chromatography (Tosoh Corporation, HLC-8320GPC) and found to be 199,600.

[0103] <4. Preparation of coating liquid> A coating solution having the composition shown in Table 3 was prepared.

[0104] 5. Preparation of test specimens 5.1. Examples 1 to 4, Comparative Examples 1 to 3, and Comparative Example 5 The coating liquid was applied to a polypropylene film (Toyobo Pylen P2161, 50 μm thick) using a bar coater. Specifically, the coating liquid was dropped onto the corona-treated surface of the polypropylene film, and then the coating liquid was uniformly applied to the polypropylene film using the bar coater. The polypropylene film coated with the coating liquid was placed in a 60°C oven and heated for 72 hours. This resulted in a film (hereinafter sometimes referred to as a "laminated film") having a polypropylene film and a coating film formed on the polypropylene film. The dry thickness of the coating film was approximately 0.7 μm. Test pieces were cut out from the laminated film, and each performance was evaluated using these test pieces. 5.2. Comparative Example 4 Test pieces were cut out from a commercially available stoma pouch (Alcare, Celcare® 1 TD) and used to evaluate various properties. Of the two sides of this test piece, the side that was the inner surface of the stoma pouch will be referred to as "side I" below.

[0105] <6. Evaluation Method> <6.1. Cloudy coating liquid> The coating liquid was visually evaluated for cloudiness. Examples in which the coating liquid was not cloudy were indicated by ◯, and examples in which the coating liquid was cloudy were indicated by ×.

[0106] <6.2. Cloudiness of the coating film> The coating film was visually evaluated for cloudiness. Examples in which the coating film was not cloudy were indicated by ◯, and examples in which the coating film was cloudy were indicated by ×.

[0107] <6.3. Paint cracks> The appearance of the coating film was visually evaluated according to the following criteria. A: No cracks B: There are cracks, but the coating film is not peeling off near the cracks. In other words, there are no large cracks that could lead to peeling of the paint film. C: There is a crack and the paint film is peeling off near the crack.

[0108] <6.4.Slip resistance> Approximately 100 μL of curry was drawn up using a micropipette from a commercially available 30 g pack of curry (Miyajima Shoyu) and then dispensed onto the coating or I side of the test piece. The test piece was left standing vertically for 10 minutes, and the distance the curry slid down was measured. Here, "sliding distance" refers to the distance over which the majority of the curry (approximately 90 μL or more) slid down. Cases where the sliding distance was 2 cm or more are indicated by a circle, and cases where the sliding distance was less than 2 cm are indicated by an x. Although curry is a food product, it can be considered as feces when evaluating sliding properties. Since the properties of real feces vary from sample to sample, it is difficult to evaluate sliding distance with good reproducibility. On the other hand, commercially available curry has more stable properties than real feces, so using commercially available curry allows for better reproducibility in evaluating sliding distance.

[0109] <6.5.Durability> After measuring the sliding distance, the curry was removed from the test piece as much as possible using a Pro Wipe. The sliding distance was then measured again using the procedure described above in <6.4. Sliding Property>. This time, the curry was dispensed onto the same spot on the test piece. Examples where the sliding distance was 2 cm or more are marked with a circle, and examples where the sliding distance was less than 2 cm are marked with an X.

[0110] <6.6. Heat sealability> Two test pieces cut from the laminate film were heat-sealed by thermocompression bonding, either with the coating or with the I-sides together, using a heat sealer (Fuji Impulse Polysealer® P-300). The heat sealer's heating time control knob was set to 10, the pressure lever was depressed, and the heat sealer's cooling completion sound was heard before the pressure lever was raised. This procedure was repeated twice. One test piece was held between the thumb and index finger of the right hand, and the other test piece was held between the thumb and index finger of the left hand. The heat-sealed sample was then pulled with the right and left hands separated by 180°. The heat sealability and appearance were then evaluated using the following criteria. ○: No peeling occurs at the seal interface, and at least one of the test pieces breaks ×: Peeling occurs at the seal interface

[0111] <7.Results> A table containing the results is shown below. [Table 3] In this table, the mass of the betaine acrylic polymer is the mass of the solid content of the betaine acrylic polymer solution, and the mass of the anionic surfactant is the mass of the solid content of the anionic surfactant. The amount of solvent in Table 3 is the total amount of solvent derived from the betaine acrylic polymer solution and the anionic surfactant, as well as solvent not derived from these. For coating solutions containing anionic surfactants, the "mass ratio" in Table 3 refers to the mass of the solids of the anionic surfactant relative to the mass of the solids of the betaine acrylic polymer solution. That is, the mass ratio is: mass of solids of the betaine acrylic polymer solution / mass of solids of the anionic surfactant. On the other hand, for coating solutions containing ionic liquids, the "mass ratio" in Table 3 refers to the mass of the ionic liquid relative to the mass of the solid content of the betaine acrylic polymer solution. In other words, the mass ratio is: mass of solid content of betaine acrylic polymer solution / mass of ionic liquid. PP is a polypropylene (PP) film. PE is a polyethylene (PE) film. In Comparative Examples 1 to 5, durability was not evaluated.

[0112] The laminated films produced in Examples 1 to 4 had transparent coatings, were crack-free, and exhibited excellent sliding properties. Regarding sliding properties, the sliding distance for Example 1 was 8 cm, that for Example 2 was 8 cm, that for Example 3 was 17 cm, and that for Example 4 was 40 cm. Regarding durability, the sliding distance for Example 1 was 6 cm, that for Example 2 was 5 cm, that for Example 3 was 11 cm, and that for Example 4 was 32 cm.

[0113] On the other hand, the coating films of the laminated films produced in Comparative Examples 1 to 3 were cloudy, although the degree of cracking was better than that of the coating film of the laminated film produced in Comparative Example 5. Since the coating films of the laminated films produced in Comparative Examples 1 to 3 were cloudy, the transparency of these coating films was inferior to that of the coating films in Examples 1 to 4. [Industrial Applicability]

[0114] INDUSTRIAL APPLICABILITY The present invention can provide coating agents, films, and pouches, and is therefore industrially applicable.

Claims

1. a polymer including a monomer unit including a betaine structure; London dispersion term δ in Hansen solubility parameters ｄ is 10.0 MPa １／２ Over 18.3 MPa １／２ and the dipole-dipole force term δ ｐ is 10.0 MPa １／２ Over 20.0 MPa １／２ is less than or equal to the hydrogen bond strength term δ ｈ is 14.0 MPa １／２ and the London dispersion term δ in the Hansen solubility parameters. ｄ is 10.0 MPa １／２ Over 18.3 MPa １／２ and the dipole-dipole force term δ ｐ is 10.0 MPa １／２ Over 20.0 MPa １／２ is less than or equal to the hydrogen bond strength term δ ｈ is 14.0 MPa １／２ and at least one of an ionic surfactant having a molecular weight of less than 1000 or less, Coating agent.

2. The polymer is obtained by polymerizing at least a monomer represented by formula I, 【Chemical 1】 In the formula I, R １ is a (meth)acryloylaminoalkyl group having an alkyl group with 1 to 4 carbon atoms, or a (meth)acryloyloxyalkyl group having an alkyl group with 1 to 4 carbon atoms, and R ２ and R ３ are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, or a (meth)acryloyloxyalkyl group having an alkyl group with 1 to 4 carbon atoms, and R ４ is an alkylene group having 1 to 4 carbon atoms or an oxyalkylene group having 1 to 4 carbon atoms, The coating agent according to claim 1.

3. The coating agent according to claim 1 , wherein the polymer contains at least one of a silanol group and an alkoxysilyl group.

4. The coating agent according to claim 1 , comprising the ionic liquid.

5. The coating agent according to claim 1 , comprising the ionic surfactant.

6. 6. The coating agent according to claim 5, wherein the ionic surfactant is an anionic surfactant.

7. Water and and an alcohol-based solvent, The coating agent according to claim 1.

8. The coating agent according to claim 1 , further comprising a silicone-based leveling agent.

9. The coating agent according to claim 1, which is used to coat a substrate film.

10. A base film; and a coating layer formed on the substrate film using the coating agent according to claim 1. film.

11. The film of claim 10 , wherein the substrate film comprises at least one of a polyolefin and a polyester.

12. The film of claim 10 used as a packaging film.

13. The film of claim 10 used as a film for a pouch.

14. A pouch comprising the film of claim 10.

15. 15. The pouch of claim 14, which is a stoma pouch.

Images