Water-based adhesive composition for textile printing

Abstract

To provide an aqueous adhesive composition for textile printing that has excellent resistance to water washing. [Solution] The aqueous adhesive composition for textile printing of the present invention comprises a (meth)acrylic resin having a glass transition temperature of -30°C or higher and -5°C or lower, an anionic surfactant containing an ammonium salt, and a nonionic surfactant having a cloud point of 100°C or higher. Preferably, the content of the nonionic surfactant per 100 parts by mass of the (meth)acrylic resin is 0.3 parts by mass or higher and 10.0 parts by mass or lower. Preferably, the anionic surfactant contains alkylammonium sulfate. Preferably, the alkylammonium sulfate contains 12 or more carbon atoms in its molecule.

Description

Technical Field

[0001] The present invention relates to an aqueous adhesive composition for printing.

Background Art

[0002] In a printing method of applying an ink composition to a fabric as a recording medium for dyeing, an adhesive layer is formed on the surface of a conveyor belt that contacts the fabric to convey the fabric. Thereby, the fabric can be adhered and held to the conveyor belt, and the fabric can be stably conveyed.

[0003] For the formation of such an adhesive layer, a liquid sizing agent containing an adhesive is used. Since the adhesive layer is required to have an appropriate adhesive force that can preferably attach and detach the fabric fixed to the conveyor belt, water resistance and mechanical strength that can withstand water washing, a sizing agent in which a hydrophobic resin is dissolved in an organic solvent has been used.

[0004] In a sizing agent containing an organic solvent, when applying to a conveyor belt, etc., the organic solvent volatilizes, resulting in many restrictions on the surrounding environment, such as the need for sufficient ventilation. Therefore, an aqueous sizing agent in which an organic solvent does not volatilize is required. As such an aqueous sizing agent, those described in Patent Document 1 have been proposed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the sizing agent as described above, there is a problem that the durability of the adhesive layer formed using the sizing agent is low and it cannot withstand water washing.

Means for Solving the Problems

[0007] This invention was made to solve the above-mentioned problems and can be realized in the following application examples.

[0008] The aqueous adhesive composition for textile printing according to an application example of the present invention comprises a (meth)acrylic resin having a glass transition temperature of -30°C or higher and -5°C or lower, Anionic surfactants containing ammonium salts, It contains a nonionic surfactant with a cloud point of 100°C or higher. [Brief explanation of the drawing]

[0009] [Figure 1] Table 1 shows the composition and evaluation results of the aqueous adhesive compositions for textile printing in Examples 1 to 9. [Figure 2] Table 2 shows the composition and evaluation results of the aqueous adhesive compositions for textile printing in Examples 10-13 and Comparative Examples 1-5. [Modes for carrying out the invention]

[0010] Preferred embodiments of the present invention will be described in detail below. [1] Water-based adhesive composition for textile printing First, the aqueous adhesive composition for textile printing of the present invention will be described.

[0011] The aqueous adhesive composition for textile printing of the present invention is used, for example, to form an adhesive layer on the surface of a conveyor belt that comes into contact with the fabric being printed by textile printing.

[0012] The aqueous adhesive composition for textile printing of the present invention comprises a (meth)acrylic resin having a glass transition temperature of -30°C or higher and -5°C or lower, an anionic surfactant containing an ammonium salt, and a nonionic surfactant having a cloud point of 100°C or higher.

[0013] With this configuration, the adhesive layer formed by the aqueous adhesive composition for textile printing can have excellent durability against water washing. Furthermore, by forming an adhesive layer using such an aqueous adhesive composition for textile printing, the fabric can be stably fixed to the conveyor belt during transport and printing, and the printed record can be suitably peeled off the conveyor belt.

[0014] Furthermore, by using water, there is no need to use organic solvents, and the problems associated with using organic solvents, more specifically, the constraints on the surrounding environment due to the volatilization of organic solvents, do not need to be considered. In addition, the aqueous adhesive composition for textile printing of the present invention allows for a reduction in the amount of curing agent and crosslinking agent used, thereby reducing the environmental burden and improving the storage stability of the aqueous adhesive composition for textile printing.

[0015] Conversely, if the above conditions are not met, satisfactory results cannot be obtained. For example, if the glass transition temperature of the aqueous adhesive composition for textile printing is below the lower limit, the adhesive strength of the adhesive layer formed using the aqueous adhesive composition for textile printing becomes significantly stronger, and the peelability of the printed material from the conveyor belt decreases significantly. Also, if the glass transition temperature of the aqueous adhesive composition for textile printing exceeds the upper limit, the adhesive strength of the adhesive layer formed using the aqueous adhesive composition for textile printing becomes significantly weaker.

[0016] Furthermore, if the aqueous adhesive composition for textile printing does not contain an anionic surfactant containing an ammonium salt, the durability of the adhesive layer formed using the aqueous adhesive composition will be significantly inferior.

[0017] In addition, when the aqueous adhesive composition for printing does not contain a nonionic surfactant or even if it contains one, its cloud point is less than 100 °C, the durability and adhesiveness of the adhesive layer formed using the aqueous adhesive composition for printing will be extremely poor. Also, the storage stability of the aqueous adhesive composition for printing will significantly decrease. Further, when it does not contain water but instead contains an organic solvent, the effects obtained by using water as described above cannot be achieved.

[0018] [1-1] Water The aqueous adhesive composition for printing contains water.

[0019] Water is a component that imparts fluidity to the aqueous adhesive composition for printing. In the aqueous adhesive composition for printing, water functions as a solvent for dissolving components other than water, such as (meth)acrylic resins and surfactants, and as a dispersion medium for dispersing them.

[0020] The water content in the aqueous adhesive composition for printing is not particularly limited, but it is preferably 30.0% by mass or more and 80.0% by mass or less, and more preferably 35.0% by mass or more and 70.0% by mass or less. Thereby, the fluidity and viscosity of the aqueous adhesive composition for printing can be made more suitable, and the coating property of the aqueous adhesive composition for printing and the uniformity of the thickness of the adhesive layer formed using the aqueous adhesive composition for printing can be made more excellent.

[0021] [1-2] (Meth)acrylic resin The aqueous adhesive composition for printing contains a (meth)acrylic resin. The (meth)acrylic resin has a function of imparting adhesiveness to the adhesive layer formed by the aqueous adhesive composition for printing.

[0022] In particular, by using (meth)acrylic resins among various adhesive components, the adhesive strength of the adhesive layer can be made more appropriate. Furthermore, the water resistance and mechanical strength of the adhesive layer can also be improved. As a result, for example, the undesirable decrease in adhesive strength when an adhesive layer formed using an aqueous adhesive composition for textile printing is brushed with water can be more effectively suppressed.

[0023] The (meth)acrylic resin may be a water-soluble resin or an emulsion dispersed in an aqueous dispersion medium. In particular, if the (meth)acrylic resin is an emulsion synthesized by emulsion polymerization, the adhesive strength of the adhesive layer can be made even more appropriate, and the water resistance and mechanical strength of the adhesive layer can also be made even better. Furthermore, it is particularly advantageous in terms of uniformity of the film thickness and surface properties of the adhesive layer.

[0024] The (meth)acrylic resin is not particularly limited as long as it is a polymer that contains (meth)acrylic monomers such as (meth)acrylic acid and (meth)acrylic acid esters as at least part of its monomer components. For example, the (meth)acrylic resin may be a single polymer formed by the polymerization of one type of (meth)acrylic monomer, or it may be a copolymer containing multiple types of (meth)acrylic monomers as monomer components. Furthermore, the (meth)acrylic resin may be a copolymer that contains monomers other than (meth)acrylic monomers as monomer components in addition to (meth)acrylic monomers.

[0025] The (meth)acrylic resin constituting the aqueous adhesive composition for textile printing of the present invention may contain multiple different polymers. For example, the (meth)acrylic resin may be obtained by blending multiple polymers synthesized under different conditions.

[0026] (Meth)acrylic monomers are not particularly limited, but examples include (meth)acrylic monomers having an acidic group, (meth)acrylic monomers having an ester structure, and (meth)acrylic monomers having an amide structure. Examples of (meth)acrylic monomers having an acidic group include acrylic acid and methacrylic acid. Examples of (meth)acrylic monomers having an ester structure include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, butyl acrylate, butyl methacrylate, lauryl acrylate, lauryl methacrylate, isoamyl acrylate, isoamyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, cyclohexyl acrylate, and cyclohexyl methacrylate. Examples of (meth)acrylic monomers having an amide structure include acrylamide, methacrylamide, and N-isopropylacrylamide.

[0027] Other monomers besides (meth)acrylic monomers are not particularly limited, but examples include styrene and acrylonitrile.

[0028] The (meth)acrylic resin preferably contains a (meth)acrylic acid ester monomer having a linear alkyl group with 4 to 12 carbon atoms. This makes the adhesive strength of the adhesive layer formed by the aqueous adhesive composition for textile printing more suitable, allowing the fabric to be stably fixed by the conveyor belt and peeled off more favorably from the conveyor belt. Furthermore, the flexibility of the adhesive layer formed by the aqueous adhesive composition for textile printing can be improved. Therefore, it is possible to better prevent the adhesive layer from remaining on the fabric or from adhering to the cleaning brush during water washing.

[0029] Examples of (meth)acrylic acid ester monomers having a linear alkyl group with 4 to 12 carbon atoms include butyl methacrylate, butyl acrylate, 2-ethylhexyl acrylate, and lauryl methacrylate. Among these, the inclusion of butyl acrylate and 2-ethylhexyl acrylate is preferred. This makes it possible to make the glass transition temperature of the (meth)acrylic resin more suitable and to make the adhesive strength of the adhesive layer formed by the aqueous adhesive composition for textile printing better.

[0030] Furthermore, it is preferable that the (meth)acrylic acid ester monomer having a linear alkyl group with 4 to 12 carbon atoms does not have an aromatic ring. This further enhances the safety of the aqueous adhesive composition for textile printing.

[0031] The content of (meth)acrylic acid ester monomers having a linear alkyl group with 4 to 12 carbon atoms in the (meth)acrylic resin is preferably 40.0% to 98.0% by mass, more preferably 44.0% to 90.0% by mass, and even more preferably 48.0% to 80.0% by mass. This makes the adhesive strength of the adhesive layer formed by the aqueous adhesive composition for textile printing even more suitable, allowing the fabric to be more stably fixed to the conveyor belt during transport and printing, and allowing the printed material to be more easily peeled off the conveyor belt. Furthermore, the flexibility of the adhesive layer formed by the aqueous adhesive composition for textile printing can be further improved. Therefore, it is possible to further prevent the adhesive layer from remaining on the fabric or from adhering to the cleaning brush during water washing.

[0032] The acid value of the (meth)acrylic resin is preferably 3 mg KOH / g or more and 10 mg KOH / g or less, more preferably 4 mg KOH / g or more and 9 mg KOH / g or less, and even more preferably 5 mg KOH / g or more and 8 mg KOH / g or less. This makes it possible to improve the storage stability of the aqueous adhesive composition for textile printing while also improving the durability of the adhesive layer formed using the aqueous adhesive composition for textile printing.

[0033] The average particle size of the (meth)acrylic resin is preferably 100 nm to 300 nm, more preferably 120 nm to 280 nm, and even more preferably 150 nm to 260 nm. This makes it possible to improve the storage stability of the aqueous adhesive composition for textile printing.

[0034] In this specification, the average particle size refers to the particle size (D50) at which the amount of particles in the particle distribution measured by dynamic light scattering accumulates to 50% by volume from the smallest particle size side. The average particle size may also be determined, for example, by preparing a sample diluted 200 times with pure water and measuring it using the zeta potential / particle size measurement system "ELSZ-1000ZS" (manufactured by Otsuka Electronics Co., Ltd.).

[0035] The content of (meth)acrylic resin in the aqueous adhesive composition for textile printing is preferably 20.0% by mass or more and 70.0% by mass or less, and more preferably 30.0% by mass or more and 60.0% by mass or less. This makes it possible to improve the mechanical strength of the adhesive layer formed by the aqueous adhesive composition for textile printing. Furthermore, it makes it possible to improve the adhesive strength of the adhesive layer formed by the aqueous adhesive composition for textile printing, allowing the fabric to be stably fixed by the conveyor belt during transport and printing, and allowing the printed record to be more easily peeled off the conveyor belt. In addition, it makes it possible to improve the applicability and storage stability of the aqueous adhesive composition for textile printing.

[0036] The glass transition temperature of the (meth)acrylic resin is -30°C to -5°C, but more preferably -28°C to -8°C, and even more preferably -25°C to -10°C. This allows the aforementioned effects to be exhibited more significantly.

[0037] The glass transition temperature of (meth)acrylic resins may be determined by measurement, for example, differential scanning calorimetry (DSC), or it may be calculated using a formula based on the glass transition temperatures of the homopolymers of the monomers of each component contained in the (meth)acrylic resin. When calculating using a formula, if the (meth)acrylic resin is a copolymer, the glass transition temperature Tg (unit: K) of the copolymer can be calculated from the glass transition temperature Tgn (unit: K) of the homopolymer of each monomer and the mass fraction Wn of the monomers using the following FOX formula.

[0038]

number

[0039] Here, Wn is the mass fraction of each monomer. Tgn; Tg (unit: K) of homopolymer of each monomer. Tg; Tg of copolymer (unit: K)

[0040] The glass transition temperatures of homopolymers of monomers of each component contained in (meth)acrylic resins may be determined by measurement, for example, differential scanning calorimetry (DSC). Alternatively, glass transition temperatures described in various literature (e.g., polymer handbooks) may be used.

[0041] [1-3] Anionic surfactants The aqueous adhesive composition for textile printing contains an anionic surfactant containing an ammonium salt. The anionic surfactant containing an ammonium salt has the function of imparting water-wash resistance to the adhesive layer formed by the aqueous adhesive composition for textile printing. This is because, unlike metal salts, ammonia volatilizes after the aqueous adhesive composition for textile printing is applied to the conveyor belt and dried, thereby improving the water resistance of the aqueous adhesive composition for textile printing.

[0042] The anionic surfactant preferably contains ammonium alkyl sulfate. Ammonium alkyl sulfate has a low critical micelle concentration. Therefore, by including ammonium alkyl sulfate, the amount of anionic surfactant that can be used can be reduced, resulting in improved adhesive strength of the aqueous adhesive composition for textile printing.

[0043] It is preferable that the alkylammonium sulfate contains 12 or more carbon atoms in its molecule. This further reduces the amount of anionic surfactant used, resulting in even better adhesive strength for the aqueous adhesive composition for textile printing.

[0044] The alkyl group constituting the ammonium alkyl sulfate preferably has 12 carbon atoms in its main chain. Ammonium alkyl sulfate having an alkyl group with 12 carbon atoms as its main chain has a low critical micelle concentration. Therefore, the amount of anionic surfactant required can be further reduced, and the adhesive strength of the aqueous adhesive composition for textile printing can be further improved.

[0045] The alkyl group may have a side chain. In that case, the ammonium alkyl sulfate may have 12 or more carbon atoms.

[0046] Examples of alkylammonium sulfates containing 12 or more carbon atoms include alkyl(C12-C15) ammonium sulfate, alkyl(C12-C16) ammonium sulfate, ammonium lauryl sulfate, ammonium isotridecyl sulfate, and ammonium 2-octyldodecane sulfate. Among these, ammonium lauryl sulfate is preferred.

[0047] The content of ammonium alkyl sulfate per 100 parts by mass of (meth)acrylic resin is preferably 0.5 parts by mass or more and 10.0 parts by mass or less, more preferably 0.7 parts by mass or more and 6.0 parts by mass or less, and even more preferably 0.8 parts by mass or more and 2.0 parts by mass or less. This makes it possible to improve the durability of the adhesive layer formed by the aqueous adhesive composition for textile printing. Furthermore, it makes it possible to improve the storage stability of the aqueous adhesive composition for textile printing.

[0048] [1-4] Nonionic surfactants The aqueous adhesive composition for textile printing contains a nonionic surfactant with a cloud point of 100°C or higher. The nonionic surfactant with a cloud point of 100°C or higher has the function of imparting to the adhesive layer formed by the aqueous adhesive composition for textile printing durability against water washing, suitable tackiness, and excellent storage stability.

[0049] The cloud point is the temperature at which an aqueous solution containing a nonionic surfactant begins to become cloudy when its temperature is increased. The cloud point can be measured by dissolving the nonionic surfactant in water to a concentration of 1% by mass, as is commonly done.

[0050] If the cloud point of the nonionic surfactant is 100°C or higher, the surfactant can maintain its micelle state even during the high-temperature polymerization reaction performed when preparing the aqueous adhesive composition for textile printing, as described later. Therefore, the surfactant can function fully during the polymerization reaction, and the prepared aqueous adhesive composition for textile printing can fully exhibit the functions described above.

[0051] The nonionic surfactant is preferably a nonionic compound that does not contain fluorine. Examples of nonionic surfactants include ether-type nonionic surfactants such as polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl ethers, and polyoxyethylene alkylene alkyl ethers; polyoxyethylene derivatives such as ethylene oxide / propylene oxide block copolymers; ester-type nonionic surfactants such as sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, glycerin fatty acid esters, and polyoxyethylene fatty acid esters; and amine-based nonionic surfactants such as polyoxyethylene alkylamines and alkyl alkanolamides.

[0052] In the compounds constituting the above-mentioned nonionic surfactant, the hydrophobic group may be an alkylphenol group, a linear alkyl group, or a branched alkyl group, but for safety reasons, it is preferable that the compound does not have an alkylphenol group in its structure, or does not have an aromatic ring.

[0053] The content of nonionic surfactant per 100 parts by mass of (meth)acrylic resin is preferably 0.3 parts by mass or more and 10.0 parts by mass or less, more preferably 0.4 parts by mass or more and 5.0 parts by mass or less, and even more preferably 0.5 parts by mass or more and 1.5 parts by mass or less. This makes it possible to improve the durability of the adhesive layer formed by the aqueous adhesive composition for textile printing. Furthermore, it makes it possible to improve the storage stability of the aqueous adhesive composition for textile printing.

[0054] [1-5] Tackifiers The aqueous adhesive composition for textile printing may contain a tackifier. Examples of tackifiers include rosin compounds, terpene compounds, and hydrocarbon resins.

[0055] More specifically, examples include rosin compounds such as natural rosin, modified rosin, glycerol ester of natural rosin, glycerol ester of modified rosin, pentaerythritol ester of natural rosin, and pentaerythritol ester of modified rosin; terpene compounds such as copolymers of natural terpenes, three-dimensional polymers of natural terpenes, aromatically modified terpene resins, hydrogenated derivatives of aromatically modified terpene resins, terpene phenol resins, and terpene resins (monoterpene, diterpene, triterpene, polyterpene, etc.); hydrocarbon resins such as aliphatic petroleum hydrocarbon resins (C5 resins), hydrogenated derivatives of aliphatic petroleum hydrocarbon resins, aromatic petroleum hydrocarbon resins (C9 resins) such as styrene oligomers, and hydrogenated derivatives of aromatic petroleum hydrocarbon resins.

[0056] When the aqueous adhesive composition for textile printing contains a tackifier, the content of the tackifier in the aqueous adhesive composition is not particularly limited, but is preferably 5.0% by mass or less, more preferably 4.0% by mass or less, and even more preferably 0.1% by mass or more and 3.8% by mass or less. This makes the adhesive strength of the adhesive layer formed using the aqueous adhesive composition more suitable, and the effect of suppressing the decrease in adhesive strength when the adhesive layer is brushed tends to last for a longer period of time.

[0057] [1-6] Colorants The aqueous adhesive composition for textile printing may contain a colorant. Examples of colorants include various pigments and dyes.

[0058] If the aqueous adhesive composition for textile printing contains a colorant, the content of the colorant in the aqueous adhesive composition for textile printing is preferably 1.0% by mass or less, and more preferably 0.5% by mass or less.

[0059] [1-7] Other ingredients The aqueous adhesive composition for textile printing may contain components other than those listed above. Hereinafter, such components will also be referred to as "other components."

[0060] Other components include, for example, resin materials other than (meth)acrylic resins, antioxidants, colorants, antistatic agents, flame retardants, flame retardant additives, ultraviolet absorbers, flocculation inhibitors, processing aids, plasticizers, defoaming agents, anionic surfactants that do not contain ammonium salts, and nonionic surfactants with a cloud point of less than 100°C.

[0061] However, it is preferable that the aqueous adhesive composition for textile printing does not contain an ammonium salt-free anionic surfactant, or contains only a small amount of it. More specifically, the content of an ammonium salt-free anionic surfactant in the aqueous adhesive composition for textile printing is preferably 0.05% by mass or less, more preferably 0.03% by mass or less, and even more preferably 0.01% by mass or less.

[0062] Furthermore, it is preferable that the aqueous adhesive composition for textile printing does not contain nonionic surfactants having a cloud point of less than 100°C, or contains only a small amount of them. More specifically, the content of nonionic surfactants having a cloud point of less than 100°C in the aqueous adhesive composition for textile printing is preferably 0.05% by mass or less, more preferably 0.03% by mass or less, and even more preferably 0.01% by mass or less.

[0063] Examples of resin materials other than (meth)acrylic resins include urethane resins, silicone resins, and various elastomers (rubber-based materials).

[0064] The content of other components in the aqueous adhesive composition for textile printing is preferably 10.0% by mass or less, more preferably 5.0% by mass or less, and even more preferably 3.0% by mass or less.

[0065] In particular, from the viewpoint of minimizing environmental burden and restrictions on the surrounding environment due to the volatilization of organic solvents, it is preferable that the aqueous adhesive composition for textile printing contains no organic solvents or only a small amount of them. More specifically, the content of organic solvents in the aqueous adhesive composition for textile printing is preferably 5.0% by mass or less, more preferably 2.5% by mass or less, and even more preferably 0.5% by mass or less.

[0066] Furthermore, from the viewpoint of reducing environmental impact and improving storage stability, it is preferable that the aqueous adhesive composition for textile printing does not contain a curing agent and a crosslinking agent, or contains only a small amount of them. More specifically, the content of a curing agent or crosslinking agent in the aqueous adhesive composition for textile printing is preferably 5.0% by mass or less, more preferably 2.5% by mass or less, and even more preferably 0.5% by mass or less.

[0067] [1-8] Other conditions The pH of the aqueous adhesive composition for textile printing at 23°C is preferably 7.5 to 9.5, more preferably 7.7 to 9.3, and even more preferably 7.9 to 9.0. This allows for more effective suppression of hydrolysis of the (meth)acrylic resin, and more stable maintenance of the durability of the adhesive layer formed using the aqueous adhesive composition for textile printing. Furthermore, it improves the storage stability of the aqueous adhesive composition for textile printing.

[0068] The viscosity of the aqueous adhesive composition for textile printing at 23°C is not particularly limited, but is preferably 5 mPa·s to 1000 mPa·s, and more preferably 10 mPa·s to 300 mPa·s. This improves the handling properties when applying the aqueous adhesive composition for textile printing and more effectively prevents undesirable variations in the thickness and surface properties of the formed adhesive layer.

[0069] The storage modulus of the adhesive layer formed using the aqueous adhesive composition for textile printing at 23°C is 1.5 × 10⁻⁶. 5 Pa or more 5.0×10 5It is preferable that it is less than or equal to Pa, and 1.6 × 10 5 Pa or more 4.8×10 5 It is more preferable to be less than or equal to Pa, 2.0 × 10 5 Pa or more 4.5×10 5 It is even more preferable that it be Pa or less.

[0070] The method for forming the adhesive layer for measuring the storage modulus is not particularly limited, but for example, one method can be employed in which an aqueous adhesive composition for textile printing is applied to a 25 mm wide glass slide to a thickness of 0.2 mm in an environment of 23°C, and dried under conditions of 50% humidity, 23°C, and 8 hours.

[0071] Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto. [Examples]

[0072] Next, specific examples of the present invention will be described, but the present invention is not limited thereto. In the following examples, processes and measurements where the temperature conditions are not specified were performed at room temperature (23°C).

[0073] [2] Preparation of aqueous adhesive composition for textile printing [2-1] Example 1 226.3 g of deionized water was added to a reactor equipped with a stirrer, reflux condenser, thermometer, nitrogen inlet tube, and dropping funnel, and the temperature was raised to 82°C. Then, a total of 471.5 g of monomer, 135.5 g of deionized water, 15.7 g of aqueous solution of ammonium lauryl sulfate (24% solids by mass), and 3.4 g of aqueous solution of Emulgen 150 (70% solids by mass), weighed to have the composition ratio of the acrylic resin described in Example 1 in Figure 1, were added and mixed and stirred. To the homogenized solution, 135.8 g of a 3.5% by mass aqueous solution of ammonium persulfate, a polymerization initiator, was added over 1.5 hours at 82°C. After adding all the above ingredients, the mixture was kept warm for 1 hour and then cooled. 9.0 g of deionized water was added, and 15.8 g of 12% by mass aqueous ammonia was used to adjust the pH to between 8 and 9. By filtering through a 150-mesh nylon filter to remove coarse particles, an aqueous dispersion of (meth)acrylic resin, i.e., the aqueous adhesive composition for textile printing of the present invention, was obtained. The obtained aqueous adhesive composition for textile printing had the composition shown in Figure 1.

[0074] [2-2] Examples 2-13 and Comparative Examples 1-5 A water-based adhesive composition for textile printing was prepared in the same manner as in Example 1, except that the types and amounts of components used were adjusted to achieve the compositions shown in Figures 1 and 2. Note that Comparative Example 4 did not use an anionic surfactant, and Comparative Example 5 did not use a nonionic surfactant.

[0075] Figures 1 and 2 summarize the composition of the aqueous adhesive compositions for textile printing for each example and comparative example. In Figures 1 and 2, the (meth)acrylic resin column shows the content of each (meth)acrylic monomer in the (meth)acrylic resin, and the unit of the value is mass%. In Figures 1 and 2, the anionic surfactant and nonionic surfactant columns show the content of each surfactant per 100 parts by mass of the (meth)acrylic resin, and the unit of the value is parts by mass. In addition, the water, ammonium persulfate, and ammonia columns in Figures 1 and 2 show their respective contents per 100 parts by mass of the (meth)acrylic resin, and the unit of the value is parts by mass.

[0076] In Figures 1 and 2, methyl methacrylate is denoted as "MMA," ethyl methacrylate as "EMA," tert-butyl methacrylate as "t-BMA," n-butyl methacrylate as "n-BMA," isobutyl methacrylate as "i-BMA," butyl acrylate as "BA," 2-ethylhexyl acrylate as "2EHA," lauryl methacrylate as "LMA," and acrylic acid as "AA." Note that BMA, BA, 2EHA, and LMA have a linear alkyl group with 4 to 12 carbon atoms.

[0077] Furthermore, Emulgen 109P (trade name, manufactured by Kao Corporation), which is a polyoxyethylene lauryl ether used as a nonionic surfactant, was indicated as "Emulgen 109P". Similarly, Emulgen 150 (trade name, manufactured by Kao Corporation), which is a polyoxyethylene lauryl ether used as a nonionic surfactant, was indicated as "Emulgen 150". Additionally, Emulgen 4085 (trade name, manufactured by Kao Corporation), which is a polyoxyethylene myristyl ether used as a nonionic surfactant, was indicated as "Emulgen 4085". The glass transition temperature was indicated as "Tg", and the cloud point as "CP".

[0078] The glass transition temperature (Tg) of the (meth)acrylic resin is shown as the value calculated using the FOX formula described above, based on the glass transition temperatures of the homopolymers of each component monomer. The glass transition temperatures of the homopolymers of each component monomer were determined in accordance with JIS K7121, using a differential scanning calorimetry system "DSC8000" (manufactured by Perkin Elmer). The average particle size is shown as the D50 value obtained by measurement using a zeta potential / particle size measurement system "ELSZ-1000ZS" (manufactured by Otsuka Electronics Co., Ltd.). The acid value is shown as the value obtained by acid value measurement in accordance with JIS K2501.

[0079] [3] Evaluation of aqueous adhesive compositions for textile printing The aqueous adhesive compositions for textile printing related to each of the above examples and comparative examples were evaluated as follows.

[0080] [3-1] Adhesive strength An aqueous adhesive composition was applied to a glass plate to a thickness of 0.2 mm and dried at 25% humidity, 50°C, and 30 minutes to form an adhesive layer. Next, the adhesive layer formed as described above and a 50 mm wide cotton fabric were pressed together with a roller at a pressure of 1 kgf / 50 mm. Then, at 23°C, the cotton fabric was peeled off the adhesive layer in a 180° direction, and the adhesive strength (180° peel strength) was measured and evaluated according to the following evaluation criteria. A higher 180° peel strength value indicates superior adhesive strength and prevents unintended peeling during fabric transport.

[0081] A: 1.0N / 50mm or more, less than 5.0N / 50mm B: 0.1N / 50mm or more, 1.0N / less than 50mm C: 0.1N / less than 50mm

[0082] [3-2] Water wash durability An aqueous adhesive composition was applied to a glass plate to a thickness of 0.2 mm and dried at 25% humidity, 50°C, and 30 minutes to form an adhesive layer. Next, a water-moistened nylon brush was rotated at 200 rpm and pressed onto the adhesive layer formed as described above with a pressure of 1.0 N / cm. After 200 hours, the brush rotation was stopped, and the surface of the adhesive layer was visually observed and evaluated according to the following criteria. The less visible changes in appearance such as scratches, unevenness, and peeling on the surface of the adhesive layer after pressing, the better its durability against water washing. A nylon brush made of 6-10 nylon with a bristle diameter of 0.3 mm, a bristle length of 30 mm, and a brush diameter of 16 mm was used, and the brush was kept wet with water while it was rotating.

[0083] A: No injuries were found. B: Slight damage is visible. C: Significant unevenness and peeling are observed.

[0084] [3-3] Storage stability A 100g aqueous adhesive composition for textile printing was placed in a 200ml glass bottle, sealed tightly, and left to stand in a 60°C constant temperature bath for two weeks. The state was then visually observed and evaluated according to the following criteria.

[0085] A: No thickening or aggregation was observed. B: Slight thickening and aggregation are observed. C: Significant thickening and aggregation are observed.

[0086] These evaluation results are summarized in Figures 1 and 2. As is clear from Figures 1 and 2, excellent results were obtained in each of the above embodiments. In contrast, satisfactory results were not obtained in each of the above comparative examples.

Claims

1. A (meth)acrylic resin having a glass transition temperature of -30°C or higher and -5°C or lower, Anionic surfactants containing ammonium salts, Nonionic surfactants with a cloud point of 100°C or higher, A water-based adhesive composition for textile printing containing [the specified ingredient].

2. The aqueous adhesive composition for textile printing according to claim 1, wherein the content of the nonionic surfactant per 100 parts by mass of the (meth)acrylic resin is 0.3 parts by mass or more and 10.0 parts by mass or less.

3. The aqueous adhesive composition for textile printing according to claim 1 or 2, wherein the anionic surfactant comprises ammonium alkyl sulfate.

4. The aqueous adhesive composition for textile printing according to claim 3, wherein the ammonium alkyl sulfate contains 12 or more carbon atoms in its molecule.

5. The aqueous adhesive composition for textile printing according to claim 3, wherein the content of the ammonium alkyl sulfate per 100 parts by mass of the (meth)acrylic resin is 0.5 parts by mass or more and 10.0 parts by mass or less.

6. The aqueous adhesive composition for textile printing according to claim 1 or 2, wherein the (meth)acrylic resin comprises a (meth)acrylic acid ester monomer having a linear alkyl group with 4 to 12 carbon atoms.

7. The aqueous adhesive composition for textile printing according to claim 6, wherein the content of the (meth)acrylic acid ester monomer in the (meth)acrylic resin is 40.0% by mass or more and 98.0% by mass or less.

8. The aqueous adhesive composition for textile printing according to claim 1 or 2, wherein the acid value of the (meth)acrylic resin is 3 mg KOH / g or more and 10 mg KOH / g or less.

9. The aqueous adhesive composition for textile printing according to claim 1 or 2, wherein the average particle size of the (meth)acrylic resin is 100 nm or more and 300 nm or less.

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