Coatings, films, and pouches

Abstract

To provide a coating agent that has excellent sliding properties for liquids (e.g., curry, sauce, ketchup, mayonnaise, feces, etc.) and can form a coating film (i.e., a coating layer) in which the occurrence of cloudiness (specifically, cloudiness caused by the aggregation of betaine polymers described later) is suppressed or reduced. [Solution] A coating agent comprising a polymer containing monomer units including a betaine structure and an anionic surfactant having a molecular weight of less than 1000, wherein the anionic surfactant contains an alkyl group, the alkyl group having 2 to 12 carbon atoms, and when the total solid content of the polymer and the anionic surfactant is 100% by mass, the solid content of the polymer is 60% by mass or more and 90% by mass or less.

Description

[Technical Field]

[0001] This 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. A stoma is an opening created to expel waste from the body when a portion of the digestive tract (for example, the large intestine or rectum) or a portion of the urethra is removed.

[0003] The bag that receives waste discharged from a stoma is sometimes called a stoma pouch (hereinafter sometimes referred to as a "stoma appliance pouch"). When a certain amount of waste has accumulated in the stoma pouch, the waste may be emptied (for example, by flushing the waste down the toilet), and the pouch may be cleaned as needed before continuing to use it. Because waste, especially feces, is viscous, it takes some effort to remove feces from the stoma pouch.

[0004] To facilitate the removal of stool from the stoma pouch, it is known to form a functional layer containing functional particles (specifically, hydrophobic particles and / or oleophobic 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] International Publication No. 2021 / 241295 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, it can be difficult to manufacture stoma pouches 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 example 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, and therefore it is 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 force by heat sealing.

[0007] On the other hand, to facilitate the removal of stool from the stoma pouch, it is conceivable to surface-treat the film with a fluorine compound that has low surface tension. However, it can be difficult to manufacture stoma pouches using heat-sealed films that have been surface-treated with fluorine compounds. This is because it is difficult to bond surfaces treated with fluorine compounds together with strong adhesive force through heat sealing.

[0008] Based on the above, it is worthwhile to propose a new technology that can make it easier to remove stool from a stoma pouch.

[0009] Incidentally, depending on the intended use of the pouch, it may be required that it be easy to dispense viscous, fluid substances such as curry, sauce, ketchup, and mayonnaise (hereinafter sometimes referred to as "fluids"). Thus, depending on the intended use of the pouch or film, it may be necessary that the fluid slides off easily, in other words, that it has good sliding properties.

[0010] The present invention aims to provide a coating agent capable of forming a coating film (i.e., a coating layer) that exhibits excellent sliding properties for fluids (e.g., curry, sauce, ketchup, mayonnaise, feces, etc.) and suppresses or reduces the occurrence of cloudiness (specifically, cloudiness caused by the aggregation of betaine polymers, as described later). The present invention also aims to provide a film or pouch containing a coating layer that exhibits excellent sliding properties for fluids and suppresses or reduces the occurrence of cloudiness (specifically, cloudiness caused by the aggregation of betaine polymers, as described later). [Means for solving the problem]

[0011] To solve this problem, the present invention comprises the configuration described in [1] below. [1] A polymer containing monomer units including a betaine structure, Contains anionic surfactants with a molecular weight of less than 1000. The anionic surfactant contains an alkyl group, and the alkyl group has 2 to 12 carbon atoms. When the total solid content of the polymer and the anionic surfactant is 100% by mass, the solid content of the polymer is 60% by mass or more and 90% by mass or less. Coating agent.

[0012] According to [1], the coating agent contains a polymer containing monomer units containing a betaine structure, which allows it to 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. The betaine polymer contains monomer units containing a betaine structure, which allows it to form a coating film with excellent hydrophilicity. This coating film can absorb moisture from fluids and swell when it comes into contact with them. Therefore, this coating film can form a lubricated surface when it comes into contact with fluids. Because this surface is lubricated, it has excellent sliding properties for fluids. Thus, according to the coating agent in [1], it is possible to form a coating film, i.e., a coat layer, that has excellent sliding properties for fluids.

[0013] Furthermore, because the coating agent contains an anionic surfactant, it can suppress or reduce the clouding that may occur due to the aggregation of betaine polymers. This will be explained. Betaine polymers tend to have high cohesive force because they contain monomer units that include a betaine structure, and therefore the cohesive force of the coating film also tends to be high. As a result, clouding can occur in coating films containing betaine polymers. In contrast, according to [1], anionic surfactants can closely interact with betaine polymers, and therefore the cohesive force between betaine polymers can be mitigated. As a result, the aggregation of betaine polymers can be suppressed or reduced. Consequently, the clouding of the coating film that may occur due to the aggregation of betaine polymers can be suppressed or reduced, and the cohesive force between betaine polymers can be further mitigated. Therefore, according to the coating agent of [1], clouding of the coating layer that may occur due to the aggregation of betaine polymers can be suppressed or reduced.

[0014] The present invention prefers the configurations described in [2] to

[15] below. [2] The polymer is formed by polymerizing at least a monomer represented by formula I, [ka] In the above equation I, R 1 R 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, 2 and R 3 Each of these is independently a hydrogen atom, a C1-C4 alkyl group, a C1-C4 hydroxyalkyl group, or an alkyl group with 1-C4 carbon atoms (meth)acryloyloxyalkyl group, and R 4 This is an alkylene group having 1 to 4 carbon atoms, or an oxyalkylene group having 1 to 4 carbon atoms. [1] The coating agent described above. [3] The coating agent according to [1] or [2], wherein the polymer comprises at least one of a silanol group and an alkoxysilyl group. [4] The anionic surfactant is an alkyl sulfate. A coating agent as described in any of [1] to [3]. [5] Water and, Further comprising an alcohol-based solvent, A coating agent as described in any of [1] to [4]. [6] A coating agent according to any one of [1] to [5], further comprising a silicone-based leveling agent. [7] A coating agent according to any one of [1] to [6], used for coating a substrate film. [8] A base film and The substrate film comprises a coating layer formed on the substrate film with a coating agent described in any of [1] to [7], film. [9] The film according to [8], wherein the base film comprises at least one of polyolefin and polyester.

[10] The film described in [8] or [9], used as packaging film.

[11] A film used as a pouch film, as described in any of [8] to

[10] .

[12] A pouch containing the film described in any of [8] to

[11] .

[13] A stoma pouch, as described in

[12] .

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

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

[16] R 1 The coating agent, film, or pouch according to any one of the above configurations, wherein the methacryloyloxyalkyl group has 1 to 4 carbon atoms in the alkyl group.

[17] R 2 And R 3 The coating agent, film, or pouch according to any one of the above configurations, wherein each is independently an alkyl group having 1 to 4 carbon atoms.

[18] R 4 The coating agent, film, or pouch according to any one of the above configurations, wherein the alkylene group has 1 to 4 carbon atoms.

[19] The coating agent, film, or pouch according to any one of the above configurations, wherein the silicone leveling agent is polyether-modified silicone oil

[20] The film or pouch according to any one of the above configurations, wherein the thickness of the coating layer is 0.05 μm or more and 10 μm or less.

Advantages 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 is excellent in the slipperiness of a fluid substance (e.g., curry, sauce, ketchup, mayonnaise, feces, etc.) and in which the occurrence of cloudiness (specifically, cloudiness caused by the aggregation of the betaine polymer) is suppressed or reduced. According to the present invention, it is also possible to provide a film or pouch including a coating layer that is excellent in the slipperiness of a fluid substance and in which the occurrence of cloudiness (specifically, cloudiness caused by the aggregation of the betaine polymer described later) is suppressed or reduced.

Embodiments for Carrying Out 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 monomer units with 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 (for example, curry, sauce, ketchup, mayonnaise, feces, etc.). This will be explained. Because the betaine polymer contains monomer units with a betaine structure, it can form a coating film with excellent hydrophilicity. This coating film can absorb moisture from fluids and swell when it comes into contact with them. Therefore, this coating film can form a lubricated surface when it comes into contact with fluids. Because this surface is lubricated, it has excellent sliding properties for fluids. Thus, the coating agent of this embodiment can form a coating film, i.e., a coat layer, that has excellent sliding properties for fluids.

[0019] A betaine polymer can be a polymer in which at least betaine monomers are polymerized. That is, a betaine polymer can be a polymer in which monomers containing betaine monomers are polymerized.

[0020] Examples of betaine monomers include sulfoxybetaine monomer, carboxybetaine monomer, and phosphorylbetaine monomer. Of these, sulfoxybetaine monomer is preferred. These may be used individually or in combination of two or more.

[0021] The betaine monomer preferably 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 equation I, R 1 This is a (meth)acryloylaminoalkyl group with 1 to 4 carbon atoms in the alkyl group, or a (meth)acryloyloxyalkyl group with 1 to 4 carbon atoms in the alkyl group. 2 and R 3 Each of these is independently a hydrogen atom, a C1-C4 alkyl group, a C1-C4 hydroxyalkyl group, or a C1-C4 (meth)acryloyloxyalkyl group. 4 This is an alkylene group having 1 to 4 carbon atoms, or an oxyalkylene group having 1 to 4 carbon atoms.

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

[0024] R 2 and R 3Each of these is independently a hydrogen atom, a C1-C4 alkyl group, a C1-C4 hydroxyalkyl group, or a C1-C4 (meth)acryloyloxyalkyl group. Examples of C1-C4 alkyl groups include methyl, ethyl, propyl (e.g., n-propyl, i-propyl), and butyl (e.g., n-butyl, i-butyl, s-butyl, t-butyl, cyclobutyl). Examples of C1-C4 hydroxyalkyl groups include hydroxymethyl, hydroxyethyl, hydroxypropyl, and hydroxybutyl groups. Examples of C1-C4 (meth)acryloyloxyalkyl groups include (meth)acryloylaminomethyl, (meth)acryloylaminoethyl, (meth)acryloylaminopropyl, and (meth)acryloylaminobutyl groups. Among these, C1-C4 alkyl groups are preferred.

[0025] R 4 This 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 methylene, ethylene, propylene, and butylene. Examples of oxyalkylene groups having 1 to 4 carbon atoms include oxymethylene, oxyethylene, oxypropylene, and oxybutylene. Among these, alkylene groups having 1 to 4 carbon atoms are preferred.

[0026] In equation I, R 1 However, the alkyl group is a (meth)acryloyloxyalkyl group with 1 to 4 carbon atoms, and R 2 and R 3 However, each is independently an alkyl group having 1 to 4 carbon atoms, and R 4 However, it is preferable that it be an alkylene group having 1 to 4 carbon atoms. 1 However, the alkyl group is a methacryloyloxyalkyl group with 1 to 4 carbon atoms, R 2 and R 3 However, each is independently an alkyl group having 1 to 4 carbon atoms, and R 4However, an alkylene group having 1 to 4 carbon atoms is also preferred. As a specific example of the monomer represented by formula I, i.e., the sulfoxybetaine monomer represented by formula I, for example, the compound exemplified as a sulfoxybetaine monomer in Patent Document 2 (i.e., Japanese Patent No. 6467226) can be cited.

[0027] An example of a carboxybetaine monomer is the monomer represented by formula II. [ka] In equation II, R 5 and R 6 Each of these is 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 This is an alkylene group having 1 to 4 carbon atoms.

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

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

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

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

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

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

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

[0035] Betaine polymers may contain monomer units other than those containing a betaine structure. In other words, betaine polymers may be polymers in which monomers other than betaine monomers are polymerized.

[0036] Other monomers besides betaine monomers include, for example, 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 (meth) 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 individually or in combination of two or more.

[0037] When the total monomer units in a betaine polymer are considered to be 100 mol%, the monomer units containing the 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. The inclusion of at least one of these groups allows for crosslinking of the betaine polymers, thereby improving 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, a monomer 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 the compound represented by formula IV. [ka] In equation IV, R 14 , R 15 and R 16 Each of these is 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 them is an alkoxy group having 1 to 4 carbon atoms. 17 This represents an alkylene group with 1 to 12 carbon atoms.

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

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

[0043] R14 , R 15 and R 16 Preferably, at least two of these are alkoxy groups having 1 to 4 carbon atoms. It is believed that having at least two alkoxy groups having 1 to 4 carbon atoms can further improve the durability of the coating film. 14 , R 15 and R 16 It is more preferable that at least two of these are methoxy groups.

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

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

[0046] As an example of a compound represented by formula IV, 3-mercaptopropyltrimethoxysilane can be given.

[0047] The amount of compound containing an alkoxysilyl group 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, per 100 parts by mass of the monomer. On the other hand, the amount of compound containing an alkoxysilyl group 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 polymerization initiators 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 individually or in combination of two or more.

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

[0050] Solution polymerization is one example of a polymerization method. Suitable solvents for solution polymerization include, for example, 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 can be used individually or in combination of two or more. The monomer concentration, polymerization temperature, and polymerization time can be set as appropriate. Polymerization may also 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] In the coating agent of this embodiment, the solid content of the betaine polymer is preferably 60% by mass or more, and more preferably 70% by mass or more, when the total content of the solid content of the betaine polymer and the solid content of the anionic surfactant described later is taken as 100% by mass. It may also be 80% by mass or more. If it is 60% by mass or more, a coating film with even better hydrophilicity and slipperiness can be formed. On the other hand, in the coating agent of this embodiment, the solid content of the betaine polymer is preferably 90% by mass or less, and more preferably 85% by mass or less, when the total content of the solid content of the betaine polymer and the solid content of the anionic surfactant described later is taken as 100% by mass. If it is 90% by mass or less, the clouding of the coating layer that may occur due to the aggregation of the betaine polymer can be further suppressed or reduced.

[0053] <1.2. Anionic surfactants> The coating agent of this embodiment is an anionic surfactant with a molecular weight of less than 1000, specifically the London dispersion force term δ in the Hansen solubility parameter (HSP). d The value is between 13.5 and 22.0, and the inter-dipole force term δ p The hydrogen bonding force term δ is between 5.0 and 26.0. h It is preferable to include an anionic surfactant with a molecular weight of less than 1000, where the ratio is 14.0 or less.

[0054] 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, inter-dipole force, and hydrogen bonding force. Here, the component of the HSP corresponding to the London dispersion force is the dispersion term δ d , or London dispersion force term δ d It is sometimes called this. The component corresponding to the inter-dipole force of HSP is the polar term δ. p , or the inter-dipole force term δ p It is sometimes called this: The component corresponding to the hydrogen bonding force of HSP is the hydrogen bonding term δ h , or hydrogen bonding force term δ h It is sometimes called that.

[0055] HSP can be determined by the Hansen solubility sphere method. In the Hansen solubility sphere method, first, a sample (specifically, an anionic surfactant) is mixed with various solvents with known HSP, and it is determined for each solvent whether the sample has dissolved. Next, in a three-dimensional space with the London dispersion force term δ d , the dipole-dipole force term δ p , and the hydrogen bonding force term δ h as axes, the London dispersion force term δ d , the dipole-dipole force term δ p , and the hydrogen bonding force term δ h of these solvents are plotted. Based on the three-dimensional graph on which these are plotted, a minimum sphere that includes the coordinates of the solvents in which the sample has dissolved (i.e., good solvents) and does not include the coordinates of the solvents in which the sample has not dissolved (i.e., poor solvents), that is, the Hansen solubility sphere, is created. The coordinates of the center of the Hansen solubility sphere can be determined as the HSP of the sample. Specifically, HSP is determined by the method described in the examples below.

[0056] The London dispersion force term δ d of HSP is preferably 13.5 MPa 1 / 2 or more, and more preferably 14.0 MPa 1 / 2 or more. On the other hand, the London dispersion force term δ d may be, for example, 22.0 MPa 1 / 2 or less, or 21.0 MPa 1 / 2 or less.

[0057] The dipole-dipole force term δ p of HSP may be, for example, 5.0 MPa 1 / 2 or more, or 6.0 MPa 1 / 2 or more. On the other hand, the dipole-dipole force term δ p may be, for example, 26.0 MPa 1 / 2 or less, or 25.0 MPa 1 / 2 or less.

[0058] The hydrogen bonding force term δ h of HSP is preferably 5.0 MPa 1 / 2 or more, and more preferably 6.0 MPa 1 / 2The above is more preferable. On the other hand, the hydrogen bonding force term δ h For example, 14.5 MPa 1 / 2 The following is also acceptable: 14.0 MPa 1 / 2 The following is also acceptable.

[0059] The molecular weight of the anionic surfactant is preferably less than 1000. Anionic surfactants with a molecular weight of less than 1000 have the advantage of being diverse in type and therefore offering a wide range of choices.

[0060] 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 sulfosuccinate, alkylamide sulfosuccinates, alkyl carboxylates, alkylamide ether carboxylates, alkyl succinates, aliphatic acyl sarcosinates, aliphatic acyl amino acids, aliphatic acyl taurates, aliphatic 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. Alkyl sulfates and alkyl diphenyl ether disulfonates are preferred because of their high compatibility with betaine polymers. Examples of alkyl sulfates include sodium lauryl sulfate, sodium laureth sulfate, and ammonium laureth sulfate. Sodium alkyldiphenyl ether disulfonate can be cited as an example of an alkyldiphenyl ether disulfonate. The anionic group of an anionic surfactant can be, for example, a sulfonic acid group, a sulfate group, a carboxyl group, or salts thereof. Therefore, the anionic group can be, for example, -SO3 - group, -OSO3 - Group, -COO - It can be a group. Among them, the sulfate group, -OSO3- The base is preferable.

[0061] The number of carbon atoms in the alkyl group contained in the anionic surfactant is preferably 2 or more, more preferably 4 or more, and even more preferably 6 or more. When it is 2 or more, the clouding of the coating layer that may occur due to aggregation of the betaine polymer can be further suppressed or reduced. On the other hand, it is preferably 14 or less, and more preferably 12 or less. When it is 14 or less, aggregation between alkyl groups is reduced, and a coating film with even better hydrophilicity and slipperiness can be formed.

[0062] <1.4. Leveling Agent> The coating agent of this embodiment preferably contains a silicone-based leveling agent. The silicone-based leveling agent can effectively lower the surface tension of the coating agent and also lower the interfacial tension between the coating agent and the object being coated (e.g., a base film), thereby suppressing the occurrence of repellency.

[0063] Examples of silicone-based leveling agents include polyether-modified silicone oil and polyglycerin-modified silicone oil. Among these, polyether-modified silicone oil is preferred.

[0064] An example of a 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 These are, independently, groups containing a polyether group (hereinafter sometimes referred to as "introduced groups").

[0065] Each R is independently an alkyl group having 1 to 4 carbon atoms. Examples of alkyl groups having 1 to 4 carbon atoms include methyl, ethyl, propyl, and butyl groups. Among these, it is preferable that all R are methyl groups.

[0066] R e Each of these is an independent group containing a polyether group. Examples of polyether groups include polyethyleneoxy groups and polypropyleneoxy groups. A polyether group may also contain both ethyleneoxy (EO) and propyleneoxy (PO) groups. In this case, the ethyleneoxy (EO) and propyleneoxy (PO) groups may be arranged in a block-like manner or randomly. Each R e The polyether group may be linked to Si via a linking group. An example of a linking group is an alkylene group. The number of carbon atoms in the alkylene group may be, for example, 1 to 4. Examples of alkylene groups with 1 to 4 carbon atoms include the methylene group, ethylene group, propylene group, and butylene group.

[0067] Compounds represented by this formula can be called side-chain polyether-modified silicone oils. Side-chain polyether-modified silicone oils can include a main chain of repeating SiO units, a plurality of first side chains branching from the main chain, and a plurality of second side chains branching from the main chain. Each first side chain can independently be an alkyl group having 1 to 4 carbon atoms (see explanation of R). Each second side chain can independently be a group containing a polyether group (R e (See explanation).

[0068] The content of the silicone-based 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, per 100 parts by mass of betaine polymer. On the other hand, the content of the silicone-based leveling agent in the coating agent of this embodiment is preferably 3.0 parts by mass or less, even 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.

[0069] The content of the silicone-based leveling agent in this embodiment is preferably 0.002% by mass or more, and more preferably 0.005% by mass or more, based on 100% by mass of the coating agent. 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.

[0070] <1.4. Solvents> The coating agent of this embodiment contains a solvent. Examples of solvents include water, alcohol-based solvents, ketone-based solvents, amide-based solvents, and ether-based solvents. Among these, alcohol-based solvents are preferred. Including an alcohol-based solvent further suppresses the occurrence of repellency. In particular, it can further suppress repellency that may occur when a coating film is formed with the coating agent on a substrate film with relatively high hydrophobicity (for example, polyolefin films such as polyethylene film or polypropylene film). 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 a solvent. In particular, it is more preferable that the solvent contains both water and an alcohol-based solvent.

[0071] The alcohol-based solvent content in the coating agent of this embodiment is preferably 5% by mass or more, and more preferably 10% by mass or more, based on 100% by mass of the solvent. On the other hand, the alcohol-based solvent content may be, for example, 50% by mass or less, 30% by mass or less, or 25% by mass or less.

[0072] When the coating agent of this embodiment contains water and an alcohol-based solvent, the total content of water and the 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 the alcohol-based solvent may be 98% by mass or more, 99% by mass or more, or 100% by mass, based on 100% by mass of the solvent.

[0073] The solvent content of this embodiment 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. On the other hand, the solvent content may be, for example, 99% by mass or less, or 95% by mass or less.

[0074] <1.5. Others> The coating agent of this embodiment may further contain polymers other than betaine polymers. The coating agent of this embodiment contains the above-mentioned anionic surfactant (specifically, London dispersion force term δ d The value is between 10.0 and 18.3, and the inter-dipole force term δ p The hydrogen bonding force term δ is between 10.0 and 20.0. h The coating agent of this embodiment may further contain anionic surfactants other than anionic surfactants with a molecular weight of less than 1000 and a ratio of 14.0 or less. The coating agent of this embodiment may further contain antioxidants, ultraviolet absorbers, light stabilizers, fluorine compounds (for example, fluorine-based leveling agents), etc.

[0075] In the coating agent of this embodiment, a betaine polymer and the above-mentioned anionic surfactant (specifically, London dispersion force term δ d The value is between 10.0 and 18.3, and the inter-dipole force term δ p The hydrogen bonding force term δ is between 10.0 and 20.0. hThe total content of the anionic surfactant (with a molecular weight of less than 1000 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 still more preferably 97% by mass or more. This total content may be 98% by mass or more, 99% by mass or more, or 100% by mass.

[0076] <1.7. Manufacturing Methods and Uses> The coating agent of this embodiment is, for example, a betaine polymer and the above-mentioned anionic surfactant (specifically, London dispersion force term δ d The value is between 10.0 and 18.3, and the inter-dipole force term δ p The hydrogen bonding force term δ is between 10.0 and 20.0. h It can be manufactured by mixing at least one of anionic surfactants (with a molecular weight of less than 1000 and a molecular weight of 14.0 or less) with a solvent or the like, if necessary.

[0077] The coating agent of this embodiment can be suitably used to coat a base film. The base film may contain a resin. Examples of resins include polyolefins and polyesters. Therefore, the base film may contain polyolefins or polyesters. 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 make it easy to manufacture pouches by heat sealing. The base film may be a single-layer structure or a multi-layer structure. The base film may also be surface-treated. Examples of surface treatments include corona treatment and plasma treatment.

[0078] By applying the coating agent of this embodiment to a base film and drying it as necessary, a coating film, or coat layer, can be formed on the base film. If the base film is 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 base film to which the coating agent has been applied may be heated.

[0079] <2. Film and Pouch> The film of this embodiment (hereinafter sometimes referred to as "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 drying it as necessary. Since the coating layer of the film in this embodiment has excellent hydrophilicity, the reduction in heat sealability that may occur due to the formation of the coating layer is not significant.

[0080] The thickness of the base film may be, for example, 10 μm or more, 15 μm or more, or 20 μm or more. On the other hand, the thickness of the base film may be, for example, 1000 μm or less, 200 μm or less, 150 μm or less, or 100 μm or less.

[0081] 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 smaller the thickness of the coating layer, the more it is possible to avoid or reduce the decrease in heat sealability that may occur due to the coating layer. In addition, it is thought that the smaller the thickness of the coating layer, the more quickly a lubricated surface, that is, a surface with excellent sliding properties, can be formed when the coating layer comes into contact with a fluid.

[0082] The film of this embodiment may further include layers other than the base film and the coating layer. Examples of layers other than the base film and the coating layer include an adhesive layer, a nonwoven fabric layer, a printed layer, and an inorganic thin film layer. Examples of fibrous raw materials constituting the nonwoven fabric layer include cellulose fibers, polyamide fibers, vinylon fibers, polyester fibers, polyethylene fibers, polypropylene fibers, polyolefin fibers, and rayon fibers.

[0083] The film of this embodiment can be suitably used as a packaging film. Examples of packaging films include pharmaceutical packaging films, food packaging films, and electronic component packaging films (for example, films for the outer casing of lithium-ion batteries). Among these, it can be particularly suitably used as a food packaging film.

[0084] The film of this embodiment can be suitably used as a pouch film. The film of this embodiment can be particularly suitably used as a retort pouch film and a stoma pouch (i.e., a pouch for stoma appliances). In other words, the film of this embodiment can be particularly suitably used as a film for manufacturing retort pouches and a film for manufacturing stoma pouches.

[0085] The pouch of this embodiment includes the above-described film (i.e., a film comprising a base film and a coating layer formed on the base film). The pouch of this embodiment can be obtained, for example, by heat sealing the coating layers of the above-described film together. At this time, the coating layers of one film may be bonded together, or multiple films, for example, two films, may be bonded together. In the pouch of this embodiment, it is preferable that a coating layer is arranged on the inner surface of the pouch. That is, it is preferable that the innermost layer of the pouch of this embodiment is a coating layer.

[0086] The pouch in this embodiment may be, for example, a retort pouch or a stoma pouch. A stoma pouch, that is, a pouch for a stoma appliance, is a bag that receives waste discharged from a stoma. A stoma pouch may be provided with an opening for receiving waste (hereinafter sometimes referred to as the "receiving opening"). A stoma pouch may further be provided with an opening for removing waste accumulated inside the stoma pouch. A stoma appliance may include a stoma pouch and a faceplate provided on the stoma pouch. The faceplate may be provided around the receiving opening.

[0087] <3. Various modifications can be made to the embodiments described above.> Various modifications can be made to the embodiments described above. For example, one or more of the following modifications can be selected to modify the embodiments described above.

[0088] In the above-described embodiment, a configuration was explained in which a coating agent is used to coat a substrate film. However, this embodiment is not limited to this configuration. For example, a coating agent may be used to coat a glass plate, a silicon wafer, a metal plate, etc.

[0089] In the above-described embodiment, a configuration was explained in which the above-described film (i.e., a film comprising a base film and a coating layer formed on the base film) is manufactured, and then a pouch containing the coating layer is manufactured. However, this embodiment is not limited to this configuration. For example, a pouch containing a coating layer may be manufactured by coating at least a portion of the inner surface of a pouch without a coating layer with the above-described coating agent. That is, a pouch containing a coating layer may be manufactured by forming a coating layer with the above-described coating agent on at least a portion of the inner surface of a pouch without a coating layer.

[0090] In the embodiments described above, a configuration was described in which one or more of the above-mentioned films are bonded together by heat sealing in order to produce a pouch. However, this embodiment is not limited to this configuration. For example, one or more of the above-mentioned films may be cold-sealed using an adhesive or tack. [Examples]

[0091] The present invention will be described in more detail below with reference to examples and comparative examples. Hereafter, unless otherwise specified, "parts" means "parts by mass" and "%" means "percent mass".

[0092] <1. Raw materials> The following raw materials were used. Note that, in the following, polymers other than betaine acrylic polymer may be referred to as anionic functional group-containing polymers. Betaine monomer: 3-((2-(Methacryloyloxy)ethyl)dimethylammonio)propane-1-sulfonate (manufactured by TCI) Radical generation initiator: VA-086 (manufactured by Fujifilm Wako Pure Chemical Industries) Chain transfer agent (reactive group introduction agent): 3-mercaptopropyltrimethoxysilane (manufactured by TCI) Inorganic salt: Sodium sulfate (manufactured by Fujifilm Wako Pure Chemical Industries) Anionic surfactant: Sodium ethyl sulfate (manufactured by Tokyo Chemical Industry Co., Ltd., solid content concentration 98% (aqueous solution), alkyl group with 2 carbon atoms) Anionic surfactant: Sodium octyl sulfate (manufactured by Kanto Chemical Co., Ltd., solid content concentration 100%, alkyl group with 8 carbon atoms) Anionic surfactant: Sodium decyl sulfate (manufactured by Kanto Chemical Co., Ltd., solid content concentration 100%, alkyl group with 10 carbon atoms) Anionic surfactant: Sodium lauryl sulfate (manufactured by Kao Corporation, solid content concentration 98% (aqueous solution), product name Emal® 2FG, alkyl group with 12 carbon atoms) Anionic surfactant: Ammonium lauryl sulfate (manufactured by Kao Corporation, solid content concentration 25% (aqueous solution), product name: Emal® AD-25R, alkyl group with 12 carbon atoms) Anionic surfactant: Sodium hexadecyl sulfate (manufactured by Fujifilm Wako Pure Chemical Industries, solid content concentration 100%, alkyl group with 16 carbon atoms) Cationic surfactant: Octyldimethylethylammonium ethyl sulfate (manufactured by Daiichi Kogyo Seiyaku, solid content concentration 30% (aqueous solution), Catiogen® ES-OW30, alkyl group with 8 carbon atoms) Amphoteric surfactant: Lauryldimethylaminoacetic acid betaine (manufactured by Kao Corporation, solid content concentration 30% (aqueous solution), Ricabion® A-100, alkyl group with 12 carbon atoms) Leveling agent: KF-640 (manufactured by Shin-Etsu Chemical Co., Ltd., polyether-modified silicone oil)

[0093] <2. Hansen Solubility Parameter (HSP)> The Hansen solubility parameter (HSP) for anionic surfactants was determined using the solvents shown in Table 1. Specifically, the solvents used were water (H2O), 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, first, 0.2 g of anionic surfactant was added to 2 mL of solvent under a nitrogen atmosphere, thoroughly stirred, and allowed to stand for 24 hours. Next, the degree of dissolution of the anionic surfactant was visually evaluated. This allowed for the determination of whether the solvent was a good or poor solvent. The results of this determination were entered into the sphere program of the Hansen Solubility Parameters in Practice (HSPiP) 5th Edition 5.0.13 software to determine the HSP of the anionic surfactant. The London dispersion force term (i.e., dispersion term) δ of HSP obtained by this method d , the inter-dipole force term (i.e., the polarity term) δ p , hydrogen bonding force term (i.e., hydrogen bonding term) δ h This is shown in Table 2. [Table 2]

[0094] <3. Synthesis of Acrylic Polymers> 10 g of betaine monomer, 0.07 g of 3-mercaptopropyltrimethoxysilane as a chain transfer agent, and 10 g of pure water were added to a 100 mL multi-necked flask. Nitrogen gas was blown directly into the flask while stirring the solution to remove as much oxygen gas as possible. Next, 0.01 g of radical generation initiator was added, and the contents of the multi-necked flask were heated to 70°C in an oil bath. The mixture was then stirred for 4 hours while maintaining the temperature at 70°C. Subsequently, another 0.1 g of radical generation initiator was added, and the contents of the multi-necked flask were stirred for 4 hours while maintaining the temperature at 70°C. This yielded a polymer solution (solid content 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 using gel permeation chromatography [Tosoh Corporation, HLC-8320GPC], and the weight-average molecular weight was found to be 199,600.

[0095] <4. Preparation of the coating solution> A coating solution with the composition shown in Table 3 was prepared.

[0096] <5. Preparation of test specimens> <5.1. Examples 1-5, Comparative Examples 1-6> The coating solution was applied to a polypropylene film (Toyobo's Pyrene P2161, 50 μm thick) using a bar coater. Specifically, the coating solution was dropped onto the corona-treated surface of the polypropylene film, and then uniformly applied to the polypropylene film using a bar coater. The polypropylene film coated with the coating solution was placed in a 60°C oven and heated for 72 hours. This resulted in a film having a polypropylene film and a coating film formed on the polypropylene film (hereinafter sometimes referred to as "laminated film"). The dry film thickness of the coating film was approximately 0.7 μm. Test specimens were cut from the laminated film, and each performance was evaluated using these specimens. <5.2. Comparative Example 7> Test specimens were cut from commercially available stoma pouches (manufactured by Alcare, Cellcare® 1-TD), and each performance aspect was evaluated using these specimens. The side of the specimen that was the inner surface of the stoma pouch will be referred to as "Side I" below.

[0097] <6. Evaluation Method> <6.1. Cloudiness of the coating solution> The coating solution was visually evaluated to determine if it was cloudy. Examples where the coating solution was not cloudy are indicated with a circle (○), and examples where the coating solution was cloudy are indicated with a cross (×).

[0098] <6.2. Whitening of the coating film> The paint film was visually evaluated to determine if it was cloudy. Examples where the paint film was not cloudy are indicated with a circle (○), and examples where the paint film was cloudy are indicated with a cross (×).

[0099] <6.3.Slip resistance> Approximately 100 μL of curry (made by Miyajima Shoyu) was drawn up from a commercially available 30g pack of curry using a micropipette and dispensed onto the coating or surface I of the test specimen. The test specimen was left standing vertically for 10 minutes, and the distance the curry slid was measured. Here, "sliding distance" refers to the distance over which most of the curry (approximately 90 μL or more) slid. Examples where the sliding distance exceeded 3 cm were considered to have slid and were indicated with a circle (○), while examples where the sliding distance was 3 cm or less were indicated with a cross (×) as no sliding occurred. Although curry is a food product, it can be used as a substitute for feces in the evaluation of its sliding properties. Because the properties of real feces vary each time, it is difficult to reproducibly evaluate the sliding distance. On the other hand, commercially available curry has more stable properties than real feces, so using commercially available curry allows for a more reproducible evaluation of the sliding distance.

[0100] <6.4.Durability> After measuring the sliding distance, the curry was removed as much as possible from the test specimen using a ProWipe. Then, the sliding distance was measured again using the procedure described in <6.4. Sliding Properties> above. This time, the curry was dispensed to the same location on the test specimen. Examples where the sliding distance exceeded 3 cm are indicated with ○, and examples where the sliding distance was 3 cm or less are indicated with ×.

[0101] <6.5. Heat sealability> Two test pieces cut from a laminated film were heat-sealed together, either on their coated surfaces or on their I-faces, using a heat sealer (Fuji Impulse Polysealer® P-300). After heat sealing, samples were obtained. The heat sealing was performed by setting the heat sealer's heating time adjustment knob to 10, pressing down the sealing lever, and then raising the sealing lever after the heat sealer's cooling completion sound was heard. 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. After heat sealing, the sample was pulled with the right and left hands separated by 180°. The heat sealability was then evaluated visually according to the following criteria. ○: No delamination occurs at the seal interface, and at least one of the test specimens fractures. ×: Peeling occurs at the seal interface.

[0102] <7.Results> The table containing the results is shown below. [Table 3] In this table, the mass of betaine acrylic polymer refers to the mass of the solid content of the betaine acrylic polymer solution. The mass of anionic surfactant refers to the mass of the solid content of the anionic surfactant. The solvent amounts in Table 3 represent the total amount of solvents derived from betaine acrylic polymer solutions and anionic surfactants, as well as solvents not derived from these sources. Regarding coating solutions containing anionic surfactants, the "mass ratio" in Table 3 refers to the ratio of the mass of solids in the betaine acrylic polymer solution to the mass of solids in the anionic surfactant. That is, the mass ratio is: Mass of solids in the betaine acrylic polymer solution / Mass of solids in the anionic surfactant. PP stands for polypropylene (PP) film. PE stands for polyethylene (PE) film. Durability was not evaluated in Comparative Examples 1, 2, 5, and 6.

[0103] The laminated films prepared in Examples 1-5 exhibited a transparent coating and excellent slip resistance.

[0104] On the other hand, the coatings on the laminated films prepared in Comparative Examples 1, 2, 5, and 6 were cloudy, indicating that the transparency of these coatings was inferior to that of the coatings in Examples 1 to 5. In Comparative Example 7, the curry did not slide off, and in Comparative Examples 3 and 4, the sliding speed of the slid-off material was low, which was inferior to that of Examples 1 to 5. [Industrial applicability]

[0105] The present invention can provide coating agents, films, and pouches, and is therefore industrially applicable.

Claims

1. A polymer containing monomer units including a betaine structure, Contains anionic surfactants with a molecular weight of less than 1000. The anionic surfactant contains an alkyl group, and the alkyl group has 2 to 12 carbon atoms. When the total solid content of the polymer and the anionic surfactant is 100% by mass, the solid content of the polymer is 60% by mass or more and 90% by mass or less. Coating agent.

2. The polymer is formed by polymerizing at least a monomer represented by formula I, 【Chemistry 1】 In the above formula I, R １ R 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, ２ and R ３ Each of these is independently a hydrogen atom, a C1-C4 alkyl group, a C1-C4 hydroxyalkyl group, or a C1-C4 (meth)acryloyloxyalkyl group, R ４ This is an alkylene group having 1 to 4 carbon atoms, or an oxyalkylene group having 1 to 4 carbon atoms.

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

4. The coating agent according to claim 1, wherein the anionic surfactant is an alkyl sulfate.

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

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

7. A coating agent according to claim 1, used for coating a substrate film.

8. A base film and A film comprising a base film and a coating layer formed with the coating agent described in claim 1.

9. The film according to claim 9, wherein the base film comprises at least one of polyolefin and polyester.

10. The film according to claim 9, which is used as a packaging film.

11. The film according to claim 10, which is used as a film for pouches.

12. A pouch comprising the film described in claim 8.

13. The pouch according to claim 12, which is a stoma pouch.

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