Composition and film

Abstract

The present invention addresses the problem of providing a composition heaving excellent in waterrpoofing characteristics and embedding properties. A composition according to the present invention contains a binder and water-absorbing resin particles, and has an Asker C hardness of 5 or less, and the ratio of the loss elastic modulus G'' to the storage elastic modulus G' at a temperature of 25° C, a frequency of 1 Hz, and a strain of 0.1% is at least one.

Description

Composition, film

[0001] The present invention relates to compositions and films.

[0002] Various water-stopping techniques have been studied to reduce damage caused by flooding or water leakage. Examples of water-stopping techniques include a method of covering a water inlet or outlet with a water-stopping material. Flooding damage to buildings occurs, for example, when water enters through gaps in windows, doors, etc. A method of sealing the gaps and preventing water intrusion using a water-stopping material is effective against such flooding damage. Specifically, for example, a water-stopping material using a water-absorbing composition has been studied, which absorbs water when the water comes into contact with the water-absorbing composition placed in the water intrusion path and stops the water.

[0003] As an example of such a water-stopping material, Patent Document 1 discloses a water-stopping material comprising a water-absorbent resin contained in a closed-cell flexible polyurethane foam body having a closed cell ratio of 15% or more, and having a hardness of 70 or less after applying pressure for 5 minutes as measured by an Asker C-type hardness tester.

[0004] Japanese Patent Application Publication No. 63-036341

[0005] In recent years, there has been an increasing demand for water-stopping materials that can be easily used in locations of various shapes, and compositions used in such water-stopping materials are required to have excellent water-stopping ability and embeddability. In this specification, embeddability refers to the ability to embed a corner without gaps. The present inventors have studied the composition described in Patent Document 1 and found that there is room for improvement in terms of achieving both water-stopping ability and embeddability.

[0006] Therefore, an object of the present invention is to provide a composition having excellent water-stopping ability and embeddability, and a film using the composition.

[0007] As a result of extensive research into solving the above problems, the present inventors have found that the problems can be solved by the following configuration.

[0008] [1] A composition comprising a binder and water-absorbent resin particles, having an Asker C hardness of 5 or less, and a ratio of loss modulus G" to storage modulus G' of 0.200 or more at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1%. [2] The composition according to [1], wherein the Asker C hardness of the binder is 0, and a ratio of loss modulus G" to storage modulus G' of the binder of 0.100 or more at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1%. [3] The composition according to [1] or [2], wherein the binder comprises polyurethane. [4] The composition according to [3], wherein the polyurethane is a reaction product of polyol and polyisocyanate, and an equivalent ratio of isocyanate groups of the polyisocyanate to hydroxyl groups of the polyol is 0.40 or more and less than 0.50. [5] The composition according to any one of [1] to [4], wherein the content of the water-absorbent resin particles is 41 mass % or more with respect to the total mass of the composition. [6] The composition according to any one of [1] to [5], wherein the Asker C hardness of the composition is 2 or less. [7] The composition according to any one of [1] to [6], wherein the ratio of the loss modulus G" to the storage modulus G' of the composition at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% is 0.500 or more. [8] The composition according to any one of [1] to [7], which is used for waterproofing. [9] A film having a substrate layer and a layer of the composition according to any one of [1] to [8].

[10] The film according to [9], further having an adhesive layer on the side of the layer of the composition opposite to the substrate layer side.

[0009] According to the present invention, a composition having excellent water-stopping ability and embeddability can be provided. Furthermore, according to the present invention, a film using the composition can also be provided.

[0010] The present invention will be described in detail below. The following description of the components may be based on representative embodiments of the present invention, but the present invention is not limited to such embodiments.

[0011] In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​written before and after "to" as the lower and upper limits. Furthermore, in this specification, when two or more types of a certain component are present, the "content" of that component means the total content of those two or more components. In this specification, in a numerical range described in stages, the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. Furthermore, in a numerical range described in this specification, the upper or lower limit value described in a certain numerical range may be replaced with a value shown in the Examples. In this specification, a combination of two or more preferred embodiments is a more preferred embodiment.

[0012] In this specification, the term "(meth)acrylic" refers to a concept that includes either or both of acrylic and methacrylic, and the term "(meth)acrylate" refers to a concept that includes either or both of acrylate and methacrylate, and the same applies to the terms "(meth)acryloyl" and "(meth)acryloxy."

[0013] In this specification, the weight average molecular weight (Mw), number average molecular weight (Mn), and polydispersity index (also referred to as "molecular weight distribution") (Mw / Mn) are defined as polystyrene equivalent values ​​measured by GPC (Gel Permeation Chromatography) using a GPC apparatus (HLC-8120GPC, manufactured by Tosoh Corporation) (solvent: tetrahydrofuran, flow rate (sample injection amount): 10 μL, column: TSK gel Multipore HXL-M (manufactured by Tosoh Corporation), column temperature: 40°C, flow rate: 1.0 mL / min, detector: differential refractive index detector). In this specification, unless otherwise specified, measurements of various physical properties are carried out at 25°C. Furthermore, when measuring various physical properties, unless otherwise specified, the measurement object shall be left in the test environment (25°C unless otherwise specified) for 12 hours or more before the measurement is carried out.

[0014] [Composition] The composition of the present invention (hereinafter also simply referred to as "composition") contains a binder and water-absorbent resin particles, has an Asker C hardness of 5 or less, and has a ratio of loss modulus G" to storage modulus G' (G" / G', tan δ) of 0.200 or more at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1%.

[0015] Although the reason why the composition having the above configuration can solve the problems of the present invention is not entirely clear, the inventors speculate as follows. The following speculation does not limit the mechanism by which the effect is obtained. In other words, even if the effect is obtained by a mechanism other than the one described below, it is still within the scope of the present invention. The composition of the present invention contains a binder and water-absorbent resin particles and has an Asker C hardness of 5 or less. Therefore, when the composition comes into contact with water, the water-absorbent resin particles rapidly absorb water, causing the composition to swell, resulting in excellent water-stopping ability. Furthermore, since the composition has an Asker C hardness of 5 or less and a tan δ of 0.200 or more, the composition can be flexibly deformed during application and exhibits adhesiveness, resulting in excellent embeddability. Hereinafter, a composition that is superior in at least one of water-stopping ability and embeddability is also referred to as "excellent in the effects of the present invention."

[0016] The components that the composition may contain and the properties of the composition will be described in detail below.

[0017] [Binder] The composition contains a binder. The binder is a component different from the water-absorbent resin particles described below, and preferably does not contain solid particles.

[0018] The Asker C hardness of the binder is preferably 2 or less, more preferably 1 or less, and even more preferably 0, in that the flexibility of the composition is excellent and the effects of the present invention are more excellent. The lower limit is 0. The Asker C hardness can be measured using an Asker C-type testing machine (Asker Rubber Hardness Tester Type C, manufactured by Kobunshi Keiki Co., Ltd.) at a test temperature of 25°C according to a method in accordance with JIS K 7312. The Asker C hardness is measured after the measurement object has been left in the test environment (25°C) for 12 hours or more.

[0019] The tan δ of the binder at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% is preferably 0.100 or more, more preferably 0.200 or more, and even more preferably 0.300 or more, since this provides a more excellent effect of the present invention. The upper limit is not particularly limited, but is often 1.000 or less, preferably 0.700 or less, and more preferably 0.500 or less. Tan δ at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% can be calculated from the values ​​of the storage modulus G' and loss modulus G'' at a strain of 0.1%, obtained by performing strain dispersion measurements at a temperature of 25°C, a measurement frequency of 1 Hz, and a strain of 0.001 to 100% using a rheometer (MCR302, manufactured by Anton Paar). The strain dispersion measurements are performed after the measurement object has been left in the test environment (25°C) for 12 hours or more.

[0020] The storage modulus G' of the binder at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% is preferably 100 to 10,000 Pa, and more preferably 1,000 to 8,000 Pa. The loss modulus G'' of the binder at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% is preferably 100 to 2,000 Pa, more preferably 200 to 1,500 Pa, and even more preferably 400 to 800 Pa. The storage modulus G' and loss modulus G'' can be calculated in the same manner as for tan δ described above.

[0021] The binder may be water-absorbent or non-water-absorbent, but is preferably non-water-absorbent from the viewpoint of durability. From the viewpoint of durability, it is also preferable that the binder does not have a foam structure.

[0022] The components contained in the binder are not particularly limited, but in many cases the binder contains a resin, and preferably contains a resin and a plasticizer.

[0023] <Resin> The resin contained in the binder (hereinafter also referred to as "binder resin") is not particularly limited, and examples thereof include polyurethane, polyester, poly(meth)acrylate, silicone, and polyolefin. The binder preferably contains polyurethane as the binder resin, as this provides better effects of the present invention.

[0024] The binder resin preferably has a crosslinked structure in order to prevent dissolution of the composition. The crosslinked structure may be either a physical crosslink or a chemical crosslink, but a chemical crosslink is preferred in terms of durability. That is, the binder resin preferably has a three-dimensional crosslinked structure formed by covalent bonds.

[0025] (Polyurethane) The polyurethane is not particularly limited as long as it is a resin having a repeating unit containing a urethane bond, but is preferably a reaction product of a polyol and a polyisocyanate. When the polyurethane is a reaction product of a polyol and a polyisocyanate, the equivalent ratio of the isocyanate groups (NCO groups) of the polyisocyanate to the hydroxyl groups (OH groups) of the polyol is preferably 0.40 to 0.70, more preferably 0.40 to 0.55, even more preferably 0.40 or more but less than 0.50, and particularly preferably 0.40 to 0.47, in terms of better effects of the present invention.

[0026] -Polyol- The polyol is a compound having two or more hydroxyl groups. The number of hydroxyl groups possessed by the polyol is not limited as long as it is two or more, but is preferably three or more, more preferably three or four, and even more preferably three. The molecular weight of the polyol is preferably 1,000 to 10,000, more preferably 3,000 to 9,000, and even more preferably 5,000 to 8,000, in terms of excellent flexibility of the composition and superior effects of the present invention. When the polyol has a molecular weight distribution, it is preferable that the number average molecular weight falls within the above range.

[0027] As the polyol, known polyols can be used, for example, polyether polyols, polyester polyols, polycarbonate polyols, and polyacrylic polyols. As the polyol, polyether polyols are preferred in that the effects of the present invention are more excellent.

[0028] Examples of polyether polyols include polyoxyalkylene polyols obtained by polymerizing an oxirane compound using a low-molecular-weight polyol as an initiator. Examples of the low-molecular-weight polyols include low-molecular-weight diols such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,3-butanediol, 1,2-butanediol, and diethylene glycol, and low-molecular-weight triols such as glycerin and trimethylolpropane, with low-molecular-weight triols being preferred. Examples of the oxirane compounds include ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran, with ethylene oxide or propylene oxide being preferred.

[0029] The polyol is preferably a compound represented by the following formula (PO1): １ - [(O-R １ ) ｎ -OH] ｍ Formula (PO1) In formula (PO1), M １ represents an m-valent linking group. １ represents a divalent alkylene group, n represents an integer of 0 or more, and m represents an integer of 2 or more.

[0030] M １ The m-valent linking group represented by the formula (I) is not particularly limited, and examples thereof include m-valent aliphatic groups and m-valent aromatic groups, with m-valent aliphatic groups being preferred. Examples of the m-valent aliphatic groups include m-valent aliphatic hydrocarbon groups and groups in which one or more carbon atoms of an m-valent aliphatic hydrocarbon group are substituted with heteroatoms, with m-valent aliphatic hydrocarbon groups being preferred. Examples of the heteroatom include an oxygen atom, a nitrogen atom, and a sulfur atom, with an oxygen atom being preferred. The number of carbon atoms in the m-valent linking group is preferably 1 to 20, more preferably 2 to 12, and even more preferably 2 to 6.

[0031] R １The divalent alkylene group represented by the formula (I) may be linear, branched, or cyclic, preferably linear or branched, and more preferably linear. The number of carbon atoms in the divalent alkylene group is preferably 1 to 12, more preferably 1 to 6, still more preferably 2 or 3, and particularly preferably 2. Examples of the divalent alkylene group include a methylene group, an ethylene group, an n-propylene group, and a 2-methylethylene group (isopropylene group), and an ethylene group or a 2-methylethylene group is preferred. R １ If there are multiple R １ may be the same or different from each other.

[0032] n represents an integer of 0 or more, preferably an integer of 0 to 100, more preferably an integer of 10 to 80, still more preferably an integer of 20 to 70, and particularly preferably an integer of 30 to 50. m represents an integer of 2 or more, preferably an integer of 2 to 8, more preferably 3 or 4, and still more preferably 3.

[0033] In particular, the polyol preferably has an oxyalkylene structure selected from an oxyethylene unit and an oxypropylene unit, and more preferably an oxyethylene unit and an oxypropylene unit. The content of the oxyethylene unit is determined by the polyoxyalkylene structure (in formula (PO1), -(O-R １ ) ｎ The content of the oxypropylene units is preferably 5 to 50 mol %, more preferably 5 to 30 mol %, and even more preferably 10 to 20 mol %, based on all oxyalkylene structural units constituting the polyoxyalkylene structure. The content of the oxypropylene units is preferably 30 to 95 mol %, more preferably 70 to 95 mol %, and even more preferably 80 to 90 mol %, based on all oxyalkylene structural units constituting the polyoxyalkylene structure.

[0034] The polyol preferably has a polyoxyethylene structure in which two or more oxyethylene units are consecutive, and more preferably has a polyoxyethylene structure bonded to a terminal hydroxyl group of the polyol. The polyol preferably has a block structure of a polyoxypropylene structure and a polyoxyethylene structure. Among these, the polyol is preferably a compound represented by the formula (PO2). M １ - [L １ -L ２ -OH] ｍ Formula (PO2) In formula (PO2), M １ and m is M in formula (PO1). １ and m. １ represents a polyoxypropylene structure. ２ represents a polyoxyethylene structure.

[0035] Examples of polyols that can be used include Exenol 5030, Preminol PML-7001, Exenol 837, Exenol 840, Exenol 910, and Exenol 940 (all manufactured by AGC).

[0036] The polyol may be used singly or in combination of two or more. When the composition contains polyurethane which is a reaction product of polyol and polyisocyanate, the content of the polyol-derived structure in the polyurethane is preferably 15 to 60 mass %, more preferably 20 to 50 mass %, and even more preferably 20 to 27 mass %, relative to the total mass of the composition.

[0037] -Polyisocyanate- Polyisocyanate is a compound having two or more isocyanate groups (NCO groups). The number of isocyanate groups in the polyisocyanate is not particularly limited as long as it is two or more, but is preferably 3 to 6, and more preferably 3. The molecular weight of the polyisocyanate is preferably 100 to 1,000, more preferably 150 to 500, and even more preferably 200 to 300. When the polyisocyanate has a molecular weight distribution, it is preferable that the number average molecular weight falls within the above range.

[0038] The polyisocyanate may be any known polyisocyanate, such as a chain aliphatic polyisocyanate, an alicyclic polyisocyanate, an aromatic polyisocyanate, or a complex thereof, such as an isocyanurate, a biuret, an allophanate, or an adduct.

[0039] Examples of the linear aliphatic polyisocyanates include linear aliphatic diisocyanates such as methylene diisocyanate, ethylene diisocyanate, propylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate (HDI), heptamethylene diisocyanate, octamethylene diisocyanate, nonamethylene diisocyanate, and decamethylene diisocyanate, and branched aliphatic diisocyanates such as trimethylhexamethylene diisocyanate. Examples of the alicyclic polyisocyanates include isophorone diisocyanate (IPDI), 4,4-dicyclohexylmethane diisocyanate, 1,4-cyclohexylene diisocyanate, and hydrogenated tolylene diisocyanate. Examples of the aromatic polyisocyanate include 4,4'-diphenylmethane diisocyanate (MDI), 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,5-naphthalene diisocyanate, p- or m-phenylene diisocyanate, xylylene diisocyanate, m-tetramethylxylylene diisocyanate, toluene diisocyanate (TDI), phenylene diisocyanate, toluidine diisocyanate, xylylene diisocyanate, naphthylene diisocyanate, triisocyanate toluene, triisocyanate benzene, dianisidine diisocyanate, 4,4'-diphenyl ether diisocyanate, and 4,4',4"-triphenylmethane triisocyanate.

[0040] The polyisocyanate is preferably a complex of a linear aliphatic diisocyanate or a triisocyanate, more preferably a complex of HDI.

[0041] Examples of polyisocyanates that can be used include Duranate D101, Duranate D201, Duranate TKA-100, Duranate E402-100, Duranate AE700-100, and Duranate TUL-100 (all manufactured by Asahi Kasei Corporation).

[0042] The polyisocyanates may be used singly or in combination of two or more. When the composition contains polyurethane, which is a reaction product of polyol and polyisocyanate, the content of polyisocyanate-derived structures in the polyurethane is preferably 0.1 to 10 mass%, more preferably 0.5 to 5 mass%, and even more preferably 0.7 to 1.1 mass%, relative to the total mass of the composition. Furthermore, when the composition contains polyurethane, which is a reaction product of polyol and polyisocyanate, the mass ratio of polyisocyanate-derived structures to polyol-derived structures in the polyurethane is preferably 0.01 to 0.1, more preferably 0.02 to 0.04.

[0043] The content of the binder resin is preferably 10 to 70% by mass, more preferably 20 to 50% by mass, and even more preferably 20 to 30% by mass, based on the total mass of the composition. The content of the binder resin is preferably 30 to 70% by mass, and more preferably 40 to 60% by mass, based on the total mass of the binder.

[0044] <Catalyst> The binder may contain a catalyst for synthesizing the binder resin. For example, when the polyurethane is a reaction product of a polyol and a polyisocyanate, the binder may contain a polyaddition catalyst. Known catalysts can be used as the catalyst, such as organometallic compounds and tertiary amine compounds. Specific examples include organotin catalysts such as dibutyltin dilaurate and dibutyltin dioctoate, organolead catalysts such as lead octoate, and tertiary amine compounds such as triethylenediamine, N,N'-dimethylhexamethylenediamine, and N,N'-dimethylbutanediamine.

[0045] The content of the catalyst is preferably 0.01 to 1.0% by mass, more preferably 0.05 to 0.3% by mass, based on the total mass of the composition.

[0046] <Plasticizer> The binder preferably contains a plasticizer, in that the flexibility of the composition is excellent and the effects of the present invention are more excellent. It is also preferable that the plasticizer does not have a crosslinked structure.

[0047] The plasticizer is not particularly limited as long as it is compatible with the binder resin, and examples thereof include polycarboxylic acid ester-based plasticizers, polyether ester-based plasticizers, glycerin-based plasticizers, phosphate ester-based plasticizers, epoxy-based plasticizers, polyester-based plasticizers, and polyacrylic acid ester-based plasticizers.

[0048] Examples of polycarboxylic acid ester-based plasticizers include aromatic dicarboxylic acid esters, aliphatic dicarboxylic acid esters, trimellitic acid esters, and citrate esters. Examples of the esters include alkyl esters, phenyl esters, and benzyl esters. The number of carbon atoms in the alkyl group in the alkyl esters is preferably 1 to 30, more preferably 1 to 22, and even more preferably 3 to 16. The alkyl group may have a phenyl group as a substituent, or may have a divalent linking group represented by -O- between the carbon-carbon bonds of the alkyl group.

[0049] Examples of the aromatic dicarboxylic acid esters include phthalic acid esters (e.g., dimethyl phthalate, diethyl phthalate, dibutyl phthalate, dioctyl phthalate, heptyl phthalate, diisononyl phthalate, benzyl phthalate, and butyl benzyl phthalate). Examples of the aliphatic dicarboxylic acid esters include adipic acid esters (e.g., diisodecyl adipate, di-n-octyl adipate, and di-n-decyl adipate), azelaic acid esters (e.g., di-2-ethylhexyl azelate), and sebacate esters (e.g., dibutyl sebacate and di-2-ethylhexyl sebacate). Examples of trimellitic acid esters include trimethyl trimellitate, triethyl trimellitate, tripropyl trimellitate, tributyl trimellitate, triamyl trimellitate, trihexyl trimellitate, triheptyl trimellitate, tri-n-octyl trimellitate, tri-2-ethylhexyl trimellitate, trinonyl trimellitate, triisononyl trimellitate, tris(decyl) trimellitate, tris(dodecyl) trimellitate, tris(tetradecyl) trimellitate, tris(C8-C12 mixed alkyl) trimellitate, tris(C7-C9 mixed alkyl) trimellitate, and trilauryl trimellitate. Commercially available products include Adeka Cizer C-8, C-880, C-79, C810, C-9N, and C-10 manufactured by ADEKA Corporation. Examples of citrate esters include acetyl triethyl citrate and acetyl tributyl citrate.

[0050] Examples of polyether ester plasticizers include organic acid esters of polyalkylene glycols. Examples of the polyalkylene glycols include polyethylene glycol, polypropylene glycol, polybutylene glycol, poly(ethylene oxide-propylene oxide) block copolymers, poly(ethylene oxide-propylene oxide) random copolymers, and polytetramethylene glycol. The polyether chain may contain an aromatic unit such as a bisphenol. Examples of the organic acid include monocarboxylic acids (e.g., butanoic acid, isobutanoic acid, 2-ethylbutyric acid, 2-ethylhexyl acid, and decanoic acid). Commercially available polyether ester plasticizers include Adeka Cizer RS-1000, RS-735, and RS-700 manufactured by ADEKA Corporation.

[0051] Examples of glycerin-based plasticizers include glycerin monoacetomonolaurate, glycerin diacetomonolaurate, glycerin monoacetomonostearate, glycerin diacetomonooleate, and glycerin monoacetomonomonomonate.

[0052] Examples of the phosphate ester plasticizer include tributyl phosphate, tri-2-ethylhexyl phosphate, trioctyl phosphate, triphenyl phosphate, diphenyl-2-ethylhexyl phosphate, and tricresyl phosphate.

[0053] Examples of epoxy plasticizers include epoxy triglycerides made from epoxy alkyl stearate and soybean oil, and epoxy resins made mainly from bisphenol A and epichlorohydrin.

[0054] Examples of polyester plasticizers include polyesters obtained by reacting dicarboxylic acids (e.g., adipic acid, sebacic acid, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, and diphenyldicarboxylic acid) with diols (e.g., propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, ethylene glycol, and diethylene glycol). Examples of polyester plasticizers include polyesters made from hydroxycarboxylic acids (e.g., polycaprolactone). The polyesters may be end-capped with monofunctional carboxylic acids, monofunctional alcohols, or epoxy compounds. Commercially available polyester plasticizers include Adeka Cizer PN-150, PN-170, P-200, and PN-350 manufactured by ADEKA Corporation.

[0055] Examples of polyacrylic acid ester-based plasticizers include polymers of alkyl acrylate. The polyacrylic acid ester-based plasticizers may have functional groups such as epoxy groups and carboxy groups. Examples of commercially available polyacrylic acid ester-based plasticizers include the Alphon series (e.g., the non-functional UP series) manufactured by Toagosei Co., Ltd.

[0056] Examples of plasticizers other than those mentioned above include benzoic acid esters of aliphatic polyols such as neopentyl glycol dibenzoate, diethylene glycol dibenzoate, and triethylene glycol di-2-ethyl butyrate, fatty acid amides such as stearic acid amide, aliphatic carboxylic acid esters such as butyl oleate, oxyacid esters such as methyl acetylricinoleate and butyl acetylricinoleate, pentaerythritol, sorbitol, polyacrylic acid esters, silicone oils, and paraffins.

[0057] As the plasticizer, polycarboxylic acid ester plasticizers are preferred, aromatic dicarboxylic acid esters are more preferred, and phthalic acid esters are even more preferred, in that they have excellent compatibility with the binder resin and can suppress bleeding.

[0058] The plasticizer may be used alone or in combination of two or more. The content of the plasticizer is preferably 15 to 60% by mass, more preferably 20 to 50% by mass, and even more preferably 20 to 27% by mass, based on the total mass of the composition. The content of the plasticizer is preferably 30 to 70% by mass, more preferably 40 to 60% by mass, based on the total mass of the binder.

[0059] <Other Binder Components> The binder may contain components other than the resin and plasticizer described above. Examples of the other components include an adhesive component that may be contained in the adhesive layer described below, a non-particulate water-absorbing resin, a polymerization initiator, a dye, and a crosslinking agent.

[0060] [Water-absorbent resin particles] The composition contains water-absorbent resin particles. The water-absorbent resin particles are resin particles that absorb water and swell when they come into contact with water. In this specification, "water absorption" refers to a water absorption rate of 12% or more measured in accordance with Method A described in JIS K 7209:2000 (ISO 62:1999). The water absorption rate is the percentage of mass change after water absorption relative to the initial mass. The water absorption rate of the water-absorbent resin particles is 12% or more, and from the viewpoint of more excellent water-stopping ability, it is preferably 20% or more, more preferably 50% or more, and even more preferably 100% or more. The upper limit of the water absorption rate of the water-absorbent resin particles is preferably 10,000% or less, more preferably 8,000% or less, from the viewpoint of durability.

[0061] The shape of the water-absorbent resin particles is not particularly limited as long as it is particulate, and examples thereof include spherical, polygonal, scaly, tabular, and irregular shapes. The median particle size of the water-absorbent resin particles is not particularly limited, but is preferably 1 to 100 μm, more preferably 1 to 50 μm, in terms of being able to suppress detachment of the water-absorbent resin particles. The median particle size can be measured using a laser diffraction / scattering particle size distribution measuring device.

[0062] The water-absorbent resin particles are preferably crosslinked resin particles having a crosslinked structure in order to prevent dissolution of the water-absorbent resin particles. Examples of the water-absorbent resin constituting the water-absorbent resin particles include a resin obtained by polymerizing at least one selected from a polymerizable monomer having an ionic group and a polysaccharide, and a crosslinking agent.

[0063] The polymerizable monomer having an ionic group includes a polymerizable monomer having an acid group. Examples of the acid group include a carboxy group, a sulfo group, and a phosphate group, with a carboxy group being preferred. The acid group may form a salt. Examples of the salt include alkali metal salts (e.g., sodium salts and potassium salts), alkaline earth metal salts (e.g., calcium salts and magnesium salts), amine salts, and ammonium salts. Examples of the polymerizable monomer having a carboxy group include (meth)acrylic acid, maleic acid, maleic acid monoalkyl esters, fumaric acid, fumaric acid monoalkyl esters, crotonic acid, sorbic acid, itaconic acid, itaconic acid monoalkyl esters, itaconic acid glycol monoether, cinnamic acid, citraconic acid, citraconic acid monoalkyl esters, and anhydrides thereof. Examples of polymerizable monomers having a sulfo group include vinyl sulfonic acid, allyl sulfonic acid, vinyl toluene sulfonic acid, styrene sulfonic acid, 2-hydroxy-3-(meth)acryloxypropyl sulfonic acid, (meth)acrylalkyl sulfonic acids (e.g., sulfoethyl (meth)acrylate and propyl (meth)acrylate), and (meth)acrylamidoalkyl sulfonic acids (e.g., 2-acrylamido-2-methylpropane sulfonic acid). Examples of polymerizable monomers having a phosphate group include (meth)acrylic acid hydroxyalkyl phosphate monoesters (e.g., 2-hydroxyethyl (meth)acryloyl phosphate and phenyl-2-acryloyloxyethyl phosphate).

[0064] The polysaccharides are a general term for substances in which multiple monosaccharide molecules are polymerized through glycosidic bonds, and examples thereof include agarose, dextran, carrageenan, alginic acid, hyaluronic acid, chitin, chitosan, starch, and cellulose-based compounds.

[0065] Examples of the crosslinking agent include polymerizable monomers having two or more polymerizable groups, compounds having a polymerizable group and a reactive group (e.g., a hydroxyl group) that reacts with an acid group, and compounds having two or more reactive groups that react with an acid group. Examples of polymerizable monomers having two or more polymerizable groups include N,N'-methylenebis(meth)acrylamide, ethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, glycerin di(meth)acrylate, glycerin tri(meth)acrylate, trimethylolpropane triacrylate, triallylamine, triallyl cyanurate, triallyl isocyanurate, tetraallyloxyethane, and pentaerythritol triallyl ether. Examples of compounds having a polymerizable group and a reactive group that reacts with an acid group include hydroxyethyl (meth)acrylate, N-methylol (meth)acrylamide, and glycidyl (meth)acrylate. Examples of compounds having two or more reactive groups that react with an acid group include ethylene glycol, diethylene glycol, glycerin, propylene glycol, trimethylolpropane, alkanolamines (e.g., diethanolamine), and polyamines (e.g., polyethyleneimine).

[0066] Examples of water-absorbent resins include crosslinked polyacrylic acid, crosslinked acrylic acid-vinyl alcohol copolymers, crosslinked starch-acrylic acid graft copolymers, crosslinked acrylic acid-acrylamide copolymers, crosslinked polysulfonic acid, crosslinked polyacrylic acid-polysulfonic acid copolymers, crosslinked isobutylene-maleic anhydride copolymers, crosslinked polyvinylpyrrolidone, crosslinked carboxylic acid-modified polyvinyl alcohol, hydrolyzed starch-acrylonitrile graft copolymers, hydrolyzed cellulose-acrylonitrile graft copolymers, crosslinked carboxymethyl cellulose, crosslinked polyaspartic acid, and salts and partial salts thereof. Note that the partial salt of a polymer refers to an embodiment in which some acid groups of repeating units contained in the polymer form a salt; for example, a crosslinked partial sodium salt of polyacrylic acid refers to a crosslinked polyacrylic acid-polyacrylic acid sodium salt copolymer. Among these, in terms of durability, crosslinked polyacrylic acid, crosslinked starch-acrylic acid graft copolymer, and salts or partial salts thereof are preferred, with crosslinked polyacrylic acid partial salts being more preferred.

[0067] Commercially available water-absorbent resin particles can also be used, such as Sunfresh ST-500MPSA, ST-500DC, ST-500MPS, ST-100, and ST-100MPS (all manufactured by Sanyo Chemical Industries, Ltd.).

[0068] The water-absorbent resin particles may be used alone or in combination of two or more. The content of the water-absorbent resin particles is preferably 5% by mass or more, more preferably 20% by mass or more, and even more preferably 41% by mass or more, relative to the total mass of the composition, in order to obtain a more excellent effect of the present invention. Furthermore, the content of the water-absorbent resin particles is preferably 70% by mass or less, more preferably 60% by mass or less, and even more preferably 54% by mass or less, relative to the total mass of the composition, in order to obtain a more excellent effect of the present invention.

[0069] [Properties of Composition] <Asker C Hardness> The Asker C hardness of the composition is 5 or less, and in terms of better effects of the present invention, it is preferably 3 or less, more preferably 2 or less, and even more preferably 1 or less. The lower limit is 0. The method for measuring the Asker C hardness is as described above.

[0070] <Viscoelastic properties> The tan δ of the composition at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% is 0.200 or more, and is preferably 0.300 or more, more preferably 0.400 or more, and even more preferably 0.500 or more, in terms of better effects of the present invention. There is no particular upper limit, but it is often 1.000 or less, and preferably 0.800 or less. The tan δ of the composition at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% can be measured in the same manner as the tan δ of the binder described above.

[0071] The storage modulus G' of the composition at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% is preferably 500 to 50,000 Pa, more preferably 1,000 to 30,000 Pa, and even more preferably 6,000 to 10,000 Pa. The loss modulus G'' of the composition at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% is preferably 500 to 30,000 Pa, more preferably 1,000 to 10,000 Pa, and even more preferably 4,000 to 8,000 Pa. The storage modulus G' and loss modulus G'' can be calculated in the same manner as for tan δ described above.

[0072] From the viewpoint of water-stopping ability and durability, the water absorption rate of the composition is preferably 1.1 to 5.0, more preferably 1.2 to 4.0, and even more preferably 1.3 to 3.0. The water absorption rate is the water absorption rate after 1 hour, and can be calculated by dividing the mass of the composition immersed in water adjusted to 25°C for 1 hour by the mass of the composition before immersion.

[0073] [Method for Producing Composition] The method for producing the composition is not particularly limited, and the composition can be produced by a known method. For example, a method can be used in which raw materials or precursors of the binder resin (e.g., polyol and polyisocyanate), a plasticizer, water-absorbing resin particles, and other optional components (e.g., catalyst, dye) are mixed together, and the composition is polymerized while the binder resin is being polymerized. The mixing can be carried out in the air or in an inert gas atmosphere. The mixing can also be carried out under normal pressure or reduced pressure. During the polymerization of the binder resin, polymerization treatments such as heating and light irradiation can be carried out as needed. One or more of the raw materials before mixing, the mixture, and the composition after formation can be dried as needed.

[0074] [Uses] The use of the composition of the present invention is not particularly limited, but it is preferably used for water blocking. As a water blocking method, it may be used to prevent or reduce water leakage. The manner in which the composition is used for water blocking is not particularly limited, and the composition may be placed directly at the water blocking location, or may be used in the form of a film described below. The composition of the present invention can also be used as an agricultural water retention material. For example, by directly spraying the composition on a field or covering the soil with a film described below, it is possible to reduce the frequency of watering agricultural crops.

[0075] [Film] The film of the present invention includes a substrate layer and a composition layer which is a layer of the above-described composition.

[0076] [Substrate Layer] The material of the substrate constituting the substrate layer is not particularly limited, but examples thereof include resins, such as cellulose, polyester, rayon, polyolefin, poly(meth)acrylate, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), cycloolefin polymer (COP), and acrylonitrile / butadiene / styrene copolymer (ABS).

[0077] The substrate preferably has flexibility in terms of workability. The substrate may contain fibers. Examples of the fibers include cellulose fibers, rayon fibers, polyolefin fibers, and polyester fibers. The substrate containing fibers is preferably nonwoven fabric, cloth, or paper, and more preferably nonwoven fabric.

[0078] The thickness of the substrate layer is not particularly limited and is, for example, 15 to 200 μm. The substrate may also function as an adhesive layer having adhesiveness or bonding properties.

[0079] [Composition Layer] The film includes a composition layer, which is a layer of the above-described composition. The method for forming the composition layer is not particularly limited, and examples thereof include a method of attaching a composition to a substrate and a method of applying a composition layer-forming composition to a substrate to form a composition. The composition for forming the composition layer is not particularly limited, and examples thereof include a composition containing a binder resin raw material or precursor, a plasticizer, and water-absorbing resin particles, and optional components (e.g., a catalyst) as needed. After disposing the composition layer-forming composition on the substrate, it may be subjected to a polymerization treatment (e.g., a heating treatment, a light irradiation treatment, etc.) as needed.

[0080] The thickness of the composition layer is preferably from 100 to 5000 μm, more preferably from 1000 to 2000 μm.

[0081] [Adhesive Layer] The film preferably further has an adhesive layer on the side of the composition layer opposite to the substrate layer. The adhesive layer is a layer that has at least one of the functions of adhesion and cohesion to members (e.g., glass, resin, metal, and ceramics). By having the adhesive layer in the film, the film can be easily maintained in a water-stopping location. The adhesive layer is preferably a water-absorbing adhesive layer. A water-absorbing adhesive layer is a layer that absorbs water when in contact with water and thereby exhibits or increases adhesiveness or cohesion. By using the adhesive layer as a water-absorbing adhesive layer, excellent adhesiveness can be exhibited even in water-wet locations, making the film highly convenient when used as a water-stopping film.

[0082] As the component of the adhesive layer, known adhesives and pressure sensitive adhesives can be used, such as vinyl resins, silicones, poly(meth)acrylates, polyurethanes, polyamides, polyesters, polyolefins, and rubbers.

[0083] Examples of vinyl resins include polyvinyl alcohol and polyvinylpyrrolidone.

[0084] Examples of silicones include addition reaction type silicones, peroxide curing type silicones, and condensation type silicones.

[0085] Examples of poly(meth)acrylates include homopolymers of (meth)acrylic acid ester monomers and copolymers of acrylic acid ester monomers with other monomers. Examples of acrylic acid ester monomers include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, dimethylaminoethyl methacrylate, and glycidyl methacrylate. Examples of other monomers include vinyl acetate, (meth)acrylonitrile, (meth)acrylamide, styrene, methacrylic acid, acrylic acid, itaconic acid, methylol acrylamide, and maleic anhydride.

[0086] Polyurethanes include, for example, polyester polyurethanes and polycarbonate polyurethanes.

[0087] Examples of polyamides include polyamide (amide 11) obtained by ring-opening polycondensation of undecane lactam and polyamide (amide 12) obtained by ring-opening polycondensation of lauryllactam.

[0088] Examples of polyesters include condensation polymers of polycarboxylic acids and polyhydric alcohols, and specific examples thereof include polyethylene terephthalate and polybutylene terephthalate.

[0089] Examples of polyolefins include olefin homopolymers and copolymers of olefins with other monomers. The olefin is preferably an olefin having 2 to 6 carbon atoms. Examples of olefins include ethylene, propylene, butene, methylpentene, and hexene. Examples of copolymers of olefins with other monomers include EVA (ethylene-vinyl acetate copolymer), EAA (ethylene-acrylic acid copolymer), EEA (ethylene-ethyl acrylate copolymer), and EMMA (ethylene-methyl methacrylate copolymer).

[0090] Examples of rubbers include styrene / butadiene copolymers (SBR, SBS), styrene / isoprene copolymers (SIS), acrylonitrile-butadiene copolymers (NBR), chloroprene polymers, and isobutylene / isoprene copolymers (butyl rubber).

[0091] In terms of excellent water-absorbing adhesiveness, the adhesive layer preferably contains a vinyl resin, and more preferably contains polyvinyl alcohol.

[0092] The method for forming the adhesive layer is not particularly limited, and the adhesive layer can be formed, for example, by applying an adhesive layer-forming composition onto the composition layer. After applying the adhesive layer-forming composition, drying treatment and heat treatment may be performed as necessary. The adhesive layer-forming composition may contain other components in addition to those described above. Examples of other components include solvents, ultraviolet absorbers, antioxidants, crosslinking agents, surfactants, fillers, colorants, light stabilizers, thickeners, and polymerization initiators.

[0093] The thickness of the adhesive layer is, for example, 10 to 500 μm.

[0094] The film is preferably used as a waterproof film. A film having an adhesive layer may also be used as a waterproof tape.

[0095] The method of using the film is not particularly limited, and examples thereof include a method in which the film is placed on an object with the composition layer side of the film facing the object. The object is not particularly limited, and examples thereof include buildings, more specifically, areas containing gaps such as windows and doors. By placing the film in the area where the gap exists, the composition swells when it comes into contact with water that has entered through the gap, thereby sealing the gap and preventing water leakage.

[0096] The present invention will be described in more detail below with reference to the following examples. The materials, amounts used, ratios, treatment details, and treatment procedures shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the following examples.

[0097] Example 1 Preparation of Composition and Film Fabrication In a 300 mL stirring vessel (product name "002 Stirring Vessel", manufactured by Kinki Yoki Co., Ltd.), EXCENOL 840 (trifunctional polyol manufactured by AGC), DURANATE TKA-100 (polyisocyanate manufactured by Asahi Kasei Corporation), diisononyl phthalate (Fujifilm Wako Pure Chemical Industries, Ltd.), dibutyltin dilaurate (Fujifilm Wako Pure Chemical Industries, Ltd.), and SUNFRESH ST-500MPSA (partially crosslinked polyacrylic acid sodium salt manufactured by Sanyo Chemical Industries, Ltd.) were mixed to obtain the composition shown in Table 1, thereby obtaining 100 g of a mixture. The mixture was placed in a mixer (product name "ARV-310", manufactured by Thinky Corporation), and subjected to reduced pressure stirring treatment for 1 minute at a rotation speed of 900 rpm (revolutions per minute) and a pressure of 3 kPa. 18 g of the mixture after the reduced pressure stirring treatment was poured into a flat glass petri dish (inner diameter 7 cm) and allowed to stand at 25°C for 24 hours. The composition was then removed from the flat glass petri dish to obtain a cylindrical composition sample A with a diameter of approximately 7 cm and a height of approximately 4 mm. Separately, the mixture after the reduced pressure stirring treatment was poured into an acrylic resin container with a length of 50 mm, a width of 100 mm, and a height of 2 mm and allowed to stand at 25°C for 2 hours. After that, a nonwoven fabric (substrate, Kuraseal M) cut to a length of 50 mm and a width of 100 mm was attached to the mixture and allowed to stand at 25°C for at least 22 hours. Thereafter, the laminate having the composition layer on the substrate layer was removed from the acrylic resin container, and a PVA film (Solbron PT40, manufactured by Aicello) cut to a length of approximately 50 mm and a width of approximately 100 mm was attached to the surface of the composition layer opposite the substrate, thereby obtaining a film sample B having a length of approximately 50 mm, a width of approximately 100 mm and a height of approximately 2 mm, and having a substrate layer, a composition layer and an adhesive layer in this order.

[0098] [Measurement of Physical Properties] <Measurement of Asker C Hardness> The Asker C hardness of the prepared composition sample A was measured at 25°C using an Asker rubber hardness tester type C (manufactured by Kobunshi Keiki Co., Ltd.). The measurement of the Asker C hardness was carried out after the prepared composition sample A was placed in a test environment of 25°C for 12 hours or more. The Asker C hardness of the binder was measured in the same manner using binder sample A prepared in the same procedure as in the above-mentioned [Preparation of Composition] except that Sunfresh ST-500MPSA (water-absorbent resin particles) was not added.

[0099] <Measurement of tan δ, storage modulus G', and loss modulus G"> For the prepared composition sample A, strain dispersion measurements were carried out at strains of 0.001 to 100% using a rheometer (MCR302, manufactured by Anton Paar) under conditions of a temperature of 25°C, a frequency of 1 Hz, Nf = 1 N, and a measurement plate of PP25. From the obtained values ​​of the storage modulus G' and loss modulus G" at a strain of 0.1%, tan δ at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% was calculated. The strain dispersion measurements were carried out after the prepared composition sample A was placed in a test environment of 25°C for 12 hours or more. The tan δ, storage modulus G', and loss modulus G" of the binder at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% were measured using the above-mentioned binder sample A in the same manner.

[0100] [Examples 2 to 5, Comparative Example 1] Compositions were prepared, films were produced, and physical properties were measured in the same manner as in Example 1, except that the amounts of each component added were adjusted so that the compositions would have the values ​​shown in Table 1.

[0101] [Example 6] The preparation of the composition, the production of the film, and the measurement of the physical properties were carried out in the same manner as in Example 1, except that the step of attaching a nonwoven fabric (substrate, Kuraseal M) onto the mixture was not carried out when producing film sample B. Film sample B of Example 6 had a composition layer and an adhesive layer.

[0102] [Example 7] The preparation of the composition, the production of the film, and the measurement of the physical properties were carried out in the same manner as in Example 1, except that the step of attaching the PVA film was not carried out when producing film sample B. Film sample B of Example 7 had a base layer and a composition layer.

[0103] Comparative Example 2 The preparation of a composition, the production of a film, and the measurement of physical properties were carried out in the same manner as in Example 1, except that Sunfresh ST-500MPSA (manufactured by Sanyo Chemical Industries, Ltd.) was not used and the amount of each component added was adjusted so that the composition would be the value in Table 1.

[0104] Comparative Example 3 The preparation of a composition, the production of a film, and the measurement of physical properties were carried out in the same manner as in Example 1, except that cornstarch (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) was used instead of Sunfresh ST-500MPSA (manufactured by Sanyo Chemical Industries, Ltd.) and the amount of each component added was adjusted so that the composition was the value shown in Table 1.

[0105] [Evaluation] [Water-stopping ability] Composition sample C, 60 mm long, 60 mm wide, and 2 mm thick, was prepared according to the preparation procedure for composition sample A. Composition sample C was immersed in distilled water adjusted to 25°C, and the mass before immersion and the mass after immersion for 1 hour were measured, and the water absorption rate was calculated according to the following formula: Water absorption rate = Mass of composition sample C after immersion for 1 hour / Mass of composition sample C before immersion From the obtained water absorption rate, the water-stopping ability was evaluated according to the following evaluation criteria. The faster the water absorption rate, the more quickly the composition swells and the more excellent the water-stopping ability. For practical purposes, a rating of B or higher is preferable for water-stopping ability.

[0106] A: Water absorption rate is 1.5 or more B: Water absorption rate is 1.1 or more but less than 1.5 C: Water absorption rate is less than 1.1

[0107] [Embeddability] An acrylic resin test tank measuring 300 mm wide, 300 mm deep, and 700 mm high, with a 90° angle between the wall and bottom, was prepared. A 50 mm wide, 10 mm high through-hole was drilled in one wall of the test tank at the lower part of the inner wall, where it met the inner bottom. Film sample B, which had been wetted with water by immersion in water for 1 second, was then attached to the inner wall and inner bottom of the test tank, covering the entire surface of the hole, with the longitudinal direction of film sample B (the 100 mm length direction) approximately parallel to the width direction of the hole (the 50 mm direction). At this time, film sample B was attached so that the surface of film sample B removed from the acrylic resin container faced the inner wall of the test tank. The intersection of the inner wall and the inner bottom of the test tank was visually inspected, and the embeddability was evaluated according to the following evaluation criteria based on the presence or absence and extent of a gap between the test tank and film sample B. In practice, embeddability is preferably evaluated as B or higher.

[0108] A: No gap occurs between the test water tank and the film. B: A gap of less than 1 mm occurs between the test water tank and the film. C: A gap of 1 mm or more occurs between the test water tank and the film.

[0109] [Wet surface application] An acrylic resin test tank measuring 300 mm wide, 300 mm deep, and 700 mm high, with the wall and bottom surfaces forming a 90° angle, was prepared. After filling the tank with water, film sample B was attached to the inner surface of the tank in the water, and the wet surface application was evaluated according to the following evaluation criteria. From the viewpoint of handling, it is preferable that the film has wet surface application properties. A: Applicable B: Cannot be attached

[0110] [Tackiness] The surface of the substrate side of film sample B was evaluated by touch, and tackiness was evaluated according to the following evaluation criteria. When the film sample did not have a substrate, the surface of the composition layer opposite the adhesive layer was used as the surface of the substrate side. From the viewpoint of handling, it is preferable that the surface of the film on the substrate side does not have tackiness. A: No tackiness B: Tackiness

[0111] [Results] Tables 1 and 2 show the composition compositions, physical properties, and evaluation results. In the tables, "NCO / OH" indicates the equivalent ratio of the isocyanate groups (NCO) of the polyisocyanate to the hydroxyl groups (OH) of the polyol. In the tables, "tan δ (G" / G')" indicates the ratio (tan δ) of the loss modulus G" to the storage modulus G' at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1%. In the tables, the value shown in the column for each component is the content (parts by mass) in the composition.

[0112]

[0113]

[0114] From Tables 1 and 2, it was confirmed that the composition of the present invention has excellent water-stopping ability and embeddability.

[0115] A comparison of Examples 1 to 4 with Example 5 confirmed that when the tan δ of the composition was 0.5 or more, the embeddability was better. A comparison of Examples 1 to 4 with Example 5 confirmed that when the content of the water-absorbent resin particles was 41 mass% or more with respect to the total mass of the composition, the embeddability was better. A comparison of Example 6 with Example 5 confirmed that when the film had an adhesive layer, the wet surface application property was excellent. A comparison of Example 7 with Example 5 confirmed that when the film had a base layer, the tackiness was low.

Claims

1. A composition comprising a binder and water-absorbent resin particles, having an Asker C hardness of 5 or less, and a ratio of loss modulus G'' to storage modulus G' of 0.200 or more at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1%.

2. The composition according to claim 1, wherein the binder has an Asker C hardness of 0, and the ratio of the loss modulus G'' to the storage modulus G' of the binder at a temperature of 25°C, a frequency of 1 Hz, and a strain of 0.1% is 0.100 or more.

3. The composition of claim 1 or 2, wherein the binder comprises a polyurethane.

4. The composition according to claim 3, wherein the polyurethane is a reaction product of a polyol and a polyisocyanate, and the equivalent ratio of the isocyanate groups of the polyisocyanate to the hydroxyl groups of the polyol is 0.40 or more and less than 0.

50.

5. The composition according to claim 1 or 2, wherein the content of the water-absorbent resin particles is 41 mass % or more based on the total mass of the composition.

6. The composition according to claim 1 or 2, wherein the composition has an Asker C hardness of 2 or less.

7. The composition according to claim 1 or 2, wherein the ratio of the loss modulus G'' to the storage modulus G' of the composition at a temperature of 25°C, a frequency of 1 Hz and a strain of 0.1% is 0.500 or more.

8. The composition according to claim 1 or 2, which is used for waterproofing.

9. A film having a substrate layer and a layer of the composition according to claim 1 or 2.

10. The film according to claim 9, further comprising an adhesive layer on the side of said composition layer opposite said substrate layer.

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