Method for producing aqueous dispersion composition

Abstract

To provide an aqueous dispersion composition of a polyester block copolymer, in which a resin composition (molding) derived from the aqueous dispersion composition exhibits good mechanical properties in a product obtained by using the same in various applications, and also exhibits excellent mechanical properties even after the resin composition (molding) is treated at a high temperature.SOLUTION: A method for producing an aqueous dispersion composition includes: (1) melting and kneading (A) a polyester block copolymer and (B) an antioxidant to obtain a kneaded composition; and (2) mixing the obtained kneaded composition, (C) a surface active agent and / or (D) an aqueous medium.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to a method for producing an aqueous dispersion composition of a polymer, and more particularly to a method for producing an aqueous dispersion composition containing a polyester block copolymer. [Background technology]

[0002] Polyester block copolymers are used in a variety of applications, such as coating agents, adhesives, binders, heat-sealing agents, modifiers for emulsions and the like, and fiber sizing agents. When used in the applications listed here, it is particularly preferred that they be used as aqueous dispersion compositions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2016 / 068206 [Patent Document 2] Japanese Patent Application Publication No. 2018-135417 [Patent Document 3] International Publication No. 2008 / 020520 Summary of the Invention [Problem to be solved by the invention]

[0004] However, resin compositions (molded articles) obtained from aqueous dispersion compositions of polyester block copolymers may have significantly reduced mechanical properties compared to the raw material polyester block copolymers, or may undergo thermal degradation at high temperatures, and further improvements are required.

[0005] An object of one aspect of the present disclosure is to provide an aqueous dispersion composition of a polyester block copolymer, which is an aqueous dispersion composition that, when used in various applications, results in a resin composition (molded article) derived from the aqueous dispersion composition that exhibits good mechanical properties, and which also exhibits excellent mechanical properties even after the resin composition (molded article) is treated at high temperatures. [Means for solving the problem]

[0006] Aspects of the present disclosure include, for example, the subject matter described in the following sections: Section 1. (1) melt-kneading (A) a polyester block copolymer and (B) an antioxidant to obtain a kneaded composition; and (2) mixing the obtained kneaded composition with (C) a surfactant and / or (D) an aqueous medium; A method for producing an aqueous dispersion composition, comprising: Section 2. (A) The polyester block copolymer contains a hard segment (a1) and a soft segment (a2), the hard segment (a1) is a segment containing at least one selected from the group consisting of a polybutylene terephthalate structure containing a structural unit derived from terephthalic acid and / or dimethyl terephthalate and a structural unit derived from 1,4-butanediol, and a polybutylene isophthalate structure containing a structural unit derived from isophthalic acid and / or dimethyl isophthalate and a structural unit derived from 1,4-butanediol; Item 1. The manufacturing method according to item 1. Section 3. The soft segment (a2) is a segment containing an aliphatic polyether structure and / or an aliphatic polyester structure. Item 3. The aqueous dispersion composition according to item 2. Section 4. (B) the antioxidant is a phenolic antioxidant; (Preferably, the phenolic antioxidant satisfies one or both of the following (I) and (II): (I) the following formula:

[0007] [ka]

[0008] It is more preferable that the compound has, in its molecular structure, 1 to 4 groups represented by the following formula: (II) The melting point is 200°C or less. Item 4. The method for producing a semiconductor device according to any one of Items 1 to 3. Section 5. Item 5. The method according to any one of Items 1 to 4, wherein the surfactant (C) contains an ethylene oxide / propylene oxide copolymer. Section 6. 6. The method according to any one of items 1 to 5, wherein the polyester block copolymer (A) contained in the resulting aqueous dispersion composition has a median particle size of 0.1 to 20 μm. Section 7. 7. The method according to any one of items 1 to 6, wherein the aqueous dispersion composition to be produced satisfies at least one of the following conditions (α) to (δ): (α): (A) Contains 20 to 60 mass % of a polyester block copolymer. (β): (B) an antioxidant is contained in an amount of 0.5 to 15 parts by mass per 100 parts by mass of the polyester block copolymer (A). (γ): (C) surfactant is contained in an amount of 1 to 20 parts by mass per 100 parts by mass of the (A) polyester block copolymer. (δ): 50 to 1000 parts by mass of (D) the aqueous medium is contained relative to 100 parts by mass of (A) the polyester block copolymer. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, there is provided a production method capable of producing an aqueous dispersion composition of a polyester block copolymer, wherein the aqueous dispersion composition is used for various applications to obtain a product, such as a resin composition (molded article) derived from the aqueous dispersion composition, which exhibits excellent mechanical properties (elongation, elastic modulus, and breaking strength), and the resin composition (molded article) exhibits excellent mechanical properties even after being treated at high temperatures. DETAILED DESCRIPTION OF THE INVENTION

[0010] Each embodiment included in the present disclosure will be described in more detail below. The present disclosure preferably includes a method for producing an aqueous dispersion composition including (A) a polyester block copolymer, (B) an antioxidant, (C) a surfactant, and (D) an aqueous medium, but is not limited thereto. The present disclosure includes all of the disclosures herein that are recognizable to a person skilled in the art.

[0011] The method for producing the aqueous dispersion composition included in the present disclosure may be referred to as the production method of the present disclosure, and the aqueous dispersion composition produced by the method may be referred to as the aqueous dispersion composition of the present disclosure.

[0012] The (A) polyester block copolymer is not particularly limited, but may be, for example, a block copolymer having a hard segment (a1) and a soft segment (a2). The hard segment (a1) may be, for example, a segment having an aromatic polyester structure. The soft segment (a2) may be, for example, a segment having an aliphatic polyether structure and / or an aliphatic polyester structure. The (A) polyester block copolymer is preferably a polyester elastomer.

[0013] The hard segment (a1) of the polyester block copolymer (A) may be, for example, a segment having a polyester structure formed mainly from an aromatic dicarboxylic acid or its ester-forming derivative and a diol or its ester-forming derivative, in which case the polyester structure contains structural units derived from the aromatic dicarboxylic acid or its ester-forming derivative and structural units derived from the diol or its ester-forming derivative.

[0014] Examples of aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, phthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, anthracene dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid, diphenoxyethane dicarboxylic acid, 4,4′-diphenyl ether dicarboxylic acid, 5-sulfoisophthalic acid, and sodium 3-sulfoisophthalate.

[0015] Examples of ester-forming derivatives of aromatic dicarboxylic acids include lower alkyl esters, aryl esters, carbonate esters, and acid halides.

[0016] The hard segment (a1) of the polyester block copolymer (A) preferably contains two or more structural units derived from the aromatic dicarboxylic acid and / or its ester-forming derivative, such as a combination of terephthalic acid and isophthalic acid, terephthalic acid and dodecanedioic acid, or terephthalic acid and dimer acid. By containing two or more structural units derived from an aromatic dicarboxylic acid and / or its ester-forming derivative, the crystallinity and melting point of the hard segment can be reduced, flexibility can be imparted, and thermal adhesion to other thermoplastic resins can be improved.

[0017] Specific examples of the diol preferably include diols having a molecular weight of 400 or less, for example, aliphatic diols such as 1,4-butanediol, ethylene glycol, trimethylene glycol, pentamethylene glycol, hexamethylene glycol, neopentyl glycol, and decamethylene glycol; alicyclic diols such as 1,1-cyclohexanedimethanol, 1,4-dicyclohexanedimethanol, and tricyclodecane dimethanol; and aromatic diols such as xylylene glycol, bis(p-hydroxy)diphenyl, bis(p-hydroxy)diphenylpropane, 2,2'-bis[4-(2-hydroxyethoxy)phenyl]propane, bis[4-(2-hydroxyethoxy)phenyl]sulfone, 1,1-bis[4-(2-hydroxyethoxy)phenyl]cyclohexane, 4,4'-dihydroxy-p-terphenyl, and 4,4'-dihydroxy-p-quaterphenyl, with aliphatic glycols having 2 to 10 carbon atoms and alicyclic diols having a 5- to 10-membered ring being preferred. Such diols may also be used in the form of ester-forming derivatives, such as acetylated forms and alkali metal salts, etc. Two or more of these diols and their derivatives may be used in combination.

[0018] As the hard segment (a1), those consisting of a segment having a polybutylene terephthalate structure (i) derived from terephthalic acid and / or dimethyl terephthalate and 1,4-butanediol, those consisting of a segment having a polybutylene isophthalate structure (ii) derived from isophthalic acid and / or dimethyl isophthalate and 1,4-butanediol, and those consisting of both (i) and (ii)) are preferably used, and among these, a segment having (i) and (ii) is more preferred. A particularly preferred example of the hard segment (a1) is a segment having a polybutylene terephthalate structure.

[0019] (i) can also be described as a polybutylene terephthalate structure containing structural units derived from terephthalic acid and / or dimethyl terephthalate and units derived from 1,4-butanediol, and (ii) can also be described as a polybutylene isophthalate structure containing structural units derived from isophthalic acid and / or dimethyl isophthalate and units derived from 1,4-butanediol.

[0020] The soft segment (a2) of the polyester block copolymer (A) used in the aqueous dispersion composition of the present disclosure may be, for example, a segment having an aliphatic polyether structure and / or an aliphatic polyester structure.

[0021] Examples of the aliphatic polyether having the aliphatic polyether structure include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyhexamethylene glycol, a copolymer of ethylene oxide and propylene oxide, an ethylene oxide addition polymer of polytetramethylene glycol, an ethylene oxide addition polymer of polypropylene glycol, and a copolymer glycol of ethylene oxide and tetrahydrofuran.

[0022] Examples of the aliphatic polyester having the aliphatic polyester structure include poly(ε-caprolactone), polyenantholactone, polycaprylolactone, polybutylene adipate, and polyethylene adipate.

[0023] Among these aliphatic polyether structures and / or aliphatic polyester structures, in view of the elastic properties of the resulting polyester block copolymer, preferred aliphatic polyethers having the aliphatic polyether structure include ethylene oxide addition polymers of polytetramethylene glycol, ethylene oxide addition polymers of polypropylene glycol, and copolymer glycols of ethylene oxide and tetrahydrofuran, while preferred aliphatic polyesters having the aliphatic polyester structure include poly(ε-caprolactone), polybutylene adipate, polyethylene adipate, etc. In other words, preferred aliphatic polyether structures include structures derived from ethylene oxide addition polymers of polytetramethylene glycol, structures derived from ethylene oxide addition polymers of polypropylene glycol, and structures derived from copolymer glycols of ethylene oxide and tetrahydrofuran, while preferred aliphatic polyester structures include structures derived from poly(ε-caprolactone), structures derived from polybutylene adipate, and structures derived from polyethylene adipate.

[0024] Among these, the aliphatic polyether having the aliphatic polyether structure is preferably an ethylene oxide addition polymer of polytetramethylene glycol or an ethylene oxide addition polymer of polypropylene glycol, and the aliphatic polyester having the aliphatic polyester structure is preferably a copolymer glycol of ethylene oxide and tetrahydrofuran.

[0025] The number average molecular weight of the aliphatic polyether structure and / or the aliphatic polyester structure is preferably about 300 to 6,000.

[0026] Although not particularly limited, the (A) polyester block copolymer preferably has a hard segment (a1) containing at least one structure selected from the group consisting of a polybutylene terephthalate structure containing structural units derived from terephthalic acid and / or dimethyl terephthalate and structural units derived from 1,4-butanediol, and a polybutylene isophthalate structure containing structural units derived from isophthalic acid and / or dimethyl isophthalate and structural units derived from 1,4-butanediol, and a soft segment (a2) containing an aliphatic polyether structure and / or an aliphatic polyester structure. It is more preferred that the soft segment (a2) contains at least one structure selected from the group consisting of a structure derived from an ethylene oxide addition polymer of polytetramethylene glycol, a structure derived from an ethylene oxide addition polymer of poly(propylene oxide) glycol, and a structure derived from a copolymer glycol of ethylene oxide and tetrahydrofuran.

[0027] The amount of the soft segment (a2) in the polyester block copolymer (A) used in the aqueous dispersion composition of the present disclosure is, for example, 20 to 95% by mass, preferably 25 to 90% by mass, relative to 100% by mass of the polyester block copolymer (A). The copolymerization ratio of (a1) to (a2) can be set within this range. For example, when the amount of (a2) is 20 to 95% by mass, the amount of (a1) is 80 to 5% by mass.

[0028] The melting point of the (A) polyester block copolymer used in the aqueous dispersion composition of the present disclosure is preferably 105°C to 225°C, and more preferably 125°C to 205°C.

[0029] In the present disclosure, the melting point of the (A) polyester block copolymer is a value determined as follows.

[0030] That is, 5 mg of the polyester block copolymer to be measured is measured in a differential scanning calorimeter (DSC) by (i) heating it from 30°C to 200°C at a rate of 10°C / min, followed by cooling it to -50°C, (ii) heating it from -50°C to 200°C and then cooling it to -50°C, and (iii) again heating it from -50°C to 200°C and then cooling it to 30°C. The melting point is the average of the endothermic peak temperatures obtained during the heating processes of (ii) and (iii).

[0031] An example of a differential scanning calorimeter (DSC) is DSC7020 (Hitachi High-Tech Science Corporation).

[0032] The polyester block copolymer (A) used in the aqueous dispersion composition of the present disclosure can be produced by a known method or a method that can be easily derived from a known method, and the production method is not particularly limited. Specific examples of the production method include a method of polycondensing an ester of an aromatic dicarboxylic acid or its ester-forming derivative with a diol or its ester-forming derivative with a monomer constituting an aliphatic polyether and / or an aliphatic polyester, preferably in the presence of a catalyst.

[0033] The polyester block copolymer (A) used in the aqueous dispersion composition of the present disclosure may be a commercially available product. Examples of commercially available products include Hytrel (registered trademark) 3001 (melting point = 161°C) manufactured by Toray Celanese Co., Ltd., Hytrel (registered trademark) 3046 (melting point = 160°C) manufactured by Toray Celanese Co., Ltd., and Hytrel (registered trademark) 4057N (melting point = 150°C) manufactured by Toray Celanese Co., Ltd. Other examples include Vylon (registered trademark) GM-915 (melting point = 139°C) manufactured by Toyobo MC Co., Ltd.

[0034] In the aqueous dispersion composition of the present disclosure, the (A) polyester block copolymer may be used alone or in combination of two or more.

[0035] The antioxidant (B) used in the production method of the present disclosure is not particularly limited as long as it does not impair the effects of the present invention, and known antioxidants (particularly known antioxidants used in preparing resin compositions) can be used. Examples include phenolic antioxidants, amine antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants, hydrazine-based antioxidants, and amide-based antioxidants, and among these, phenolic antioxidants are preferred.

[0036] Among the phenolic antioxidants, those having the following formula:

[0037] [ka]

[0038] More preferred are compounds having, in their molecular structure, a group represented by the following formula: Further preferred are compounds having, in their molecular structure, 1 to 4 (1, 2, 3, or 4) such groups.

[0039] Among them, (B) antioxidants include: Formula (1):

[0040] [ka]

[0041] (In formula (1), R 1 and R 2 are the same or different and represent a hydrogen atom or a group of formula (2a):

[0042] [ka]

[0043] (In formula (2a), R na represents -O- or -NH-, and n 1a represents an integer from 1 to 20, and n 2a represents an integer from 0 to 3.) represents a group represented by R1 and R 2 At least one of them represents a group represented by formula (2a), and when both represent a group represented by formula (2a), they may be the same or different, R 3 and R 4 are the same or different and represent a hydrogen atom or a group of formula (2b):

[0044] [ka]

[0045] (In formula (2b), R nb represents -O- or -NH-, and n 1b represents an integer from 1 to 20, and n 2b represents an integer from 0 to 3.) represents a group represented by R 3 and R 4 When both represent a group represented by formula (2b), they may be the same or different, m represents 0 or 1.) A compound represented by the following formula is preferred.

[0046] When m is 0, the compound represented by formula (1) is R 1 -R 2 (R 1 and R 2 is the same as above.)

[0047] As mentioned above, n 1a represents an integer of 1 to 20 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20). The upper or lower limit of the range (1 to 20) may be, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19. For example, the range may be 1 to 5, 15 to 20, or 2 to 19.

[0048] Also, as mentioned above, n 2arepresents an integer of 0 to 3 (0, 1, 2, or 3), and particularly preferably represents 1.

[0049] Also, as mentioned above, n 1b represents an integer of 1 to 20 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20). The upper or lower limit of the range (1 to 20) may be, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19. For example, the range may be 1 to 5, 15 to 20, or 2 to 19.

[0050] Also, as mentioned above, n 2b represents an integer of 0 to 3 (0, 1, 2, or 3), and particularly preferably represents 1.

[0051] A more preferred example of the antioxidant (B) is a compound represented by the formula (1): 1 and R 2 Both represent a group represented by formula (2a), and in formula (2a), n 1a represents an integer of 1 to 5.

[0052] Another preferred example of the antioxidant (B) is a compound represented by the formula (1), wherein m is 0 and R 1 and R 2 is R 1 indicates a hydrogen atom, and R 2 represents a group represented by formula (2a), and in formula (2a), n 1a represents an integer of 15 to 20.

[0053] The (B) antioxidant preferably has a melting point of 200°C or lower. The melting point is preferably 40°C or higher. The upper or lower limit of the melting point range (40 to 200°C) may be, for example, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, or 195°C. For example, the melting point of the (B) antioxidant is more preferably 45 to 170°C.

[0054] As the antioxidant, a phenol-based antioxidant (particularly a compound having 1 to 4 of the above groups in the molecular structure) with a melting point of 200° C. or less is particularly preferred.

[0055] Such antioxidants may be known compounds or may be synthesized by modifying known compounds in a readily conceivable manner, or may be commercially available products.

[0056] Commercially available phenolic antioxidants include, for example, Irganox 259, Irganox 1010, Irganox 1076, Irganox 1098 (all manufactured by BASF Japan), Adekastab AO-50, Adekastab AO-60 (all manufactured by ADEKA Corporation), and the like.

[0057] The antioxidants can be used alone or in combination of two or more.

[0058] The surfactant (C) used in the aqueous dispersion composition of the present disclosure is preferably a nonionic surfactant. Examples of nonionic surfactants include polyvinyl alcohol, modified polyvinyl alcohol, polyethylene glycol, ethylene oxide / propylene oxide copolymer, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene alkyl thioether, polyoxyethylene sorbitan fatty acid monoester, polyoxyethylene alkylamide, and polyglycerin ester. Among these, polyvinyl alcohol and ethylene oxide / propylene oxide copolymer are preferred from the viewpoints of emulsion stabilization ability and excellent heat resistance. Examples of preferred polyvinyl alcohols include vinyl alcohol / vinyl acetate copolymers, which are usually soluble in water and have emulsion stabilization ability.

[0059] Polyvinyl alcohol is, for example, a polymer represented by the following formula (I). H(CHCH(OH)) j (CH2CH(OCOCH3)) k H (I) However, in the polymer represented by formula (I), (CH2CH(OH)) and (CH2CH(OCOCH3)) are randomly arranged.

[0060] In formula (I), j and k each represent the number of moles added, j representing an integer of, for example, 1 to 3000, and k representing an integer of, for example, 0 to 1000. These may be the same as or different from each other.

[0061] The degree of polymerization of polyvinyl alcohol is not particularly limited, but the degree of polymerization (in other words, the value of i+k) is preferably 300 to 3,000, and more preferably 500 to 2,500.

[0062] The degree of saponification of polyvinyl alcohol is not particularly limited, but is preferably 70 to 99 mol %, more preferably 85 to 95 mol %.

[0063] The ethylene oxide / propylene oxide copolymer is not particularly limited as long as it is within a range in which the desired effect can be obtained, and is, for example, a block copolymer represented by the following formula (II). HO(CH2CH2O) p (CH2CH(CH3)O) q (CH2CH2O) r H (II) In formula (II), p, q, and r each represent the number of moles added, where p represents an integer of, for example, 2 to 300, q represents an integer of, for example, 10 to 150, and r represents an integer of, for example, 2 to 300. These may be the same as or different from each other.

[0064] The mass average molecular weight of the ethylene oxide / propylene oxide copolymer is not particularly limited, but is, for example, 3000 to 30000, preferably 6000 to 25000, and particularly preferably 8000 to 20000. The content of ethylene oxide-derived monomer units in the ethylene oxide / propylene oxide copolymer is not particularly limited, but is, for example, 40 to 95% by mass, preferably 45 to 90% by mass, and particularly preferably 50 to 85% by mass, relative to 100% by mass of the ethylene oxide / propylene oxide copolymer.

[0065] The surfactant (C) is preferably solid at room temperature, and more preferably has a melting point of 50° C. or higher. Such properties can more effectively prevent the surfactant (C) from bleeding onto the surface of the molded article.

[0066] The surfactant (C) can be used alone or in combination of two or more. By including the surfactant (C), the aqueous dispersion composition of the present disclosure can preferably be in the form of an emulsion.

[0067] The aqueous medium (D) used in the aqueous dispersion composition of the present disclosure is preferably water. The water is not particularly limited, and for example, ion-exchanged water, distilled water, etc. can be used appropriately.

[0068] The production method of the present disclosure includes (1): melt-kneading (A) a polyester block copolymer and (B) an antioxidant to obtain a kneaded composition, and (2): mixing the obtained kneaded composition with (C) a surfactant and / or (D) an aqueous medium. The production method of the present disclosure allows the production of the aqueous dispersion composition of the present disclosure.

[0069] In step (1), (A) and (B) are melt-kneaded, and other components may be further included as long as the effects of the present invention are not particularly impaired. However, since it is preferable that (A) and (B) are uniformly kneaded, even if other components are included, it is preferable that the amount of such other components is relatively small. Examples of such other components include surfactants. When a surfactant is used as the other component, it is preferable that the surfactant is the same component as the surfactant (C) used in step (2).

[0070] The means for melt-kneading (A) and (B) is not particularly limited as long as it is capable of melting and kneading (A) and (B), and known means can be used. Examples include a single-screw or multiple-screw (e.g., twin-screw or four-screw) extruder, a kneader, etc. Among these, a twin-screw extruder is particularly preferred.

[0071] The temperature during melt-kneading is not particularly limited as long as it is the temperature at which (A) and (B) melt (i.e., the temperature equal to or higher than the higher of the melting points of (A) and (B)). While this temperature depends on the melting points of (A) and (B), it is preferably 100°C or higher. For example, it is preferable that the melting point is 250°C or lower. The upper or lower limit of this range (100 to 250°C) may be, for example, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, 200, 205, 210, 215, 220, 225, 230, 235, 240, or 245°C. For example, the range is preferably 110 to 220°C or 120 to 200°C.

[0072] The melt-kneading time is not particularly limited as long as it does not impair the effects of the present invention, and can be set appropriately. Although it depends on the melt-kneading means used, it is exemplified as about 1 to 60 minutes.

[0073] The means for mixing the kneaded composition (A) and (B) with the surfactant (C) and / or the aqueous medium (D) is not particularly limited as long as it is capable of producing an aqueous dispersion (preferably an emulsion) by mixing them, and known means can be used. Examples include a single-screw or multiple-screw (e.g., twin-screw or four-screw) extruder, an autoclave equipped with a stirring means (e.g., a stirring blade), a kneader, etc. Among these, a twin-screw extruder is particularly preferred. Alternatively, a mixture of the surfactant (C) and the aqueous medium (D) may be prepared and mixed with the kneaded composition (A) and (B).

[0074] The melt-kneading means in step (1) and the mixing means in step (2) may be the same or different, and are preferably the same. For example, when a twin-screw extruder is used as the melt-kneading means in step (1), (A) and (B) (and other components as needed) are fed from the upstream side (for example, a first feed port) and melt-kneaded, and then (C) and / or (D) are fed from the downstream side (for example, a second feed port) and mixed, thereby producing an aqueous dispersion composition.

[0075] Furthermore, the temperature during mixing (which may be referred to as emulsification, since emulsification occurs during mixing) is not particularly limited as long as it is a temperature at which an aqueous dispersion composition can be produced. For example, in order to reduce the thermal history of (A), a temperature between 40°C lower than the melting point of (A) and 100°C higher than said melting point is preferred, and a temperature between 30°C lower than the melting point of (A) and 60°C higher than said melting point is more preferred. Within these ranges, a temperature equal to or lower than the melting point of (A) is even more preferred. Specifically, although depending on the melting point of (A), a temperature of 50 to 250°C can be cited as an example. The upper or lower limit of this range (50 to 250°C) may be, for example, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, 200, 205, 210, 215, 220, 225, 230, 235, 240, or 245°C. For example, the range is preferably 110 to 220°C or 120 to 200°C.

[0076] In the aqueous dispersion composition obtained by the production method of the present disclosure (i.e., the aqueous dispersion composition of the present disclosure), the average particle size of (A) is preferably in the range of 0.1 to 20 μm. The upper or lower limit of this range may be, for example, 0.2, 0.3, 0.4, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19 μm. The average particle size is preferably 0.2 to 15 μm, and more preferably 0.3 to 12 μm. Having an average particle size within this range improves the static stability of the aqueous dispersion composition and provides a viscosity suitable for handling, particularly for the production of molded articles, thereby providing molded articles with superior mechanical properties. The average particle size is the volume-average median particle size measured by a laser diffraction particle size distribution analyzer.

[0077] The particle shape is not particularly limited, but spherical particles are preferred. Examples include spherical particles, ellipsoidal particles, and rod-shaped particles. Of these, spherical particles are particularly preferred. Spherical particles reduce the number of irregularly shaped particles with protrusions, thereby reducing the surface area of ​​the particles, and thus more preferably suppressing a significant increase in the viscosity of the aqueous dispersion composition.

[0078] The content of the (A) polyester block copolymer in the aqueous dispersion composition of the present disclosure is not particularly limited as long as it is within a range that does not impair the effects of the present invention, and may be, for example, approximately 1 to 60% by mass. The upper or lower limit of this range may be, for example, 2, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, or 55% by mass. For example, the range may be 2 to 55%, 10 to 50%, 20 to 45%, or 25 to 40% by mass.

[0079] The content of the (B) antioxidant in the aqueous dispersion composition of the present disclosure is preferably 0.5 to 15 parts by mass relative to 100 parts by mass of the (A) polyester block copolymer. The upper or lower limit of this range may be, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14 parts by mass. For example, this range is more preferably 1 to 10 parts by mass, and even more preferably 2 to 8 parts by mass. Furthermore, although depending on the amount of the (A) polyester block copolymer, the content of the (B) antioxidant in the aqueous dispersion composition is preferably about 0.1 to 5% by mass, and more preferably about 0.5 to 2% by mass.

[0080] The content of the (C) surfactant in the aqueous dispersion composition of the present disclosure is preferably 1 to 20 parts by mass relative to 100 parts by mass of the (A) polyester block copolymer. The upper or lower limit of this range may be, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19 parts by mass. For example, this range is more preferably 3 to 12 parts by mass, and even more preferably 4 to 10 parts by mass. Furthermore, although depending on the amount of the (A) polyester block copolymer, the content of the (C) surfactant in the aqueous dispersion composition is preferably about 0.5 to 5% by mass, and more preferably about 1 to 4% by mass.

[0081] The amount of the (D) aqueous medium used is not particularly limited, but is set to, for example, 50 to 1000 parts by mass, preferably 50 to 250 parts by mass, per 100 parts by mass of the (A) polyester block copolymer. By using the aqueous medium in such a range, an aqueous dispersion composition with good dispersion stability can be obtained. Furthermore, an aqueous dispersion composition with excellent productivity and practicality can be obtained.

[0082] The melt-kneading ratio of (A) and (B) in step (1) is not particularly limited as long as the effects of the present invention are not impaired, but it is preferably the same as the content of (A) and (B) in the aqueous dispersion composition of the present disclosure. That is, preferably, (B) is 0.5 to 15 parts by mass per 100 parts by mass of (A). The upper or lower limit of this range may be, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14 parts by mass. For example, the range is more preferably 1 to 10 parts by mass, and even more preferably 2 to 8 parts by mass.

[0083] In step (2), the ratio of the kneaded composition of (A) and (B) (and other components, if necessary) to the surfactant (C) and / or aqueous medium (D) is not particularly limited as long as the effect is not impaired. It can be appropriately set so as to achieve the preferred contents of (A) to (D) in the aqueous dispersion of the present disclosure. When the surfactant (C) is used as the other component in step (1), it is preferable to adjust the amount of (C) used in steps (1) and (2) as a whole so as to achieve the preferred content of (C) in the aqueous dispersion of the present disclosure. When (C) is used in step (1), the amount of (C) used may be within a range not exceeding the preferred (C) content in the aqueous dispersion of the present disclosure, i.e., it may be 0 to 100% by mass, preferably about 0 to 90% by mass, and more preferably about 0 to 80%, 0 to 70%, 0 to 60%, 0 to 50%, 0 to 40%, 0 to 30%, 0 to 20%, or 0 to 10% by mass, based on the total amount of (C) used in steps (1) and (2). When (D) is also used as an additional component in step (1), the amount of (D) used is preferably about 0 to 10% by mass based on the total amount of (D) used in steps (1) and (2).

[0084] When (C) and / or (D) are used as other components in step (1), the amount of (C) and / or (D) used in step (2) can be adjusted depending on the amount of (C) and / or (D) used in step (1). For example, when a preferred amount of (C) in the aqueous dispersion of the present disclosure is used in step (1), it is not necessary to further use (C) in step (2) (it is also possible to use only (D)).

[0085] The aqueous dispersion composition of the present disclosure may contain other components in addition to (A) to (D) as needed, as long as the effects of the present invention are not impaired. Examples of such other components include polymeric dispersion stabilizers. Examples of polymeric dispersion stabilizers include ethylene / ethylenically unsaturated carboxylic acid copolymers, oxidized polyethylene wax, hydroxyethyl cellulose, methyl cellulose, hydroxypropyl cellulose, polyacrylates, salts of polyacrylic acid esters, and sodium alginate. The use of a polymeric dispersion stabilizer facilitates emulsification, allowing for the production of a stable aqueous dispersion composition with smaller particle size.

[0086] When a polymer dispersion stabilizer is used, the amount used is not particularly limited, but is, for example, 0.1 to 10 parts by mass, and preferably 0.2 to 5 parts by mass, per 100 parts by mass of the polyester block copolymer (A).

[0087] Examples of other components include known molding aids such as crystal nucleating agents and lubricants, hydrolysis resistance improvers, colorants such as pigments and dyes, antistatic agents, conductive agents, flame retardants, reinforcing agents, inorganic fillers, bulking agents, plasticizers, and mold release agents.

[0088] When such other components are used, they are preferably added in step (2) in the production method of the present disclosure.

[0089] The resin composition (molded article) derived from the aqueous dispersion composition of the present disclosure exhibits excellent mechanical properties (elongation, elastic modulus, and breaking strength). In particular, the resin composition (molded article) has excellent heat resistance, and even when exposed to heat for a long period of time, the decrease in elongation, elastic modulus, and breaking strength is significantly suppressed.

[0090] Furthermore, the resin composition (molded article) derived from the aqueous dispersion composition of the present disclosure has the advantage that changes in elongation, modulus of elasticity, and strength at break are small compared to the (A) polyester block copolymer.

[0091] Furthermore, as described above, the (A) polyester block copolymer contained in the aqueous dispersion composition of the present disclosure has a relatively small median particle diameter. Therefore, when used to prepare a coating or film, a relatively thin film can be easily prepared, and when a film is prepared by heating, the film can be easily formed.

[0092] A molded article can be produced using the aqueous dispersion composition of the present disclosure. The method for producing a molded article is not particularly limited, but includes, for example, a step of applying the aqueous dispersion composition of the present disclosure to a substrate or pouring it into a mold, and a step of drying the applied or poured aqueous dispersion composition (i.e., removing the aqueous medium). A molded article in various forms, such as a coating, film, or sheet, containing (A) to (C) can be obtained by a molded article production method including such steps.

[0093] The substrate used to produce the molded article is not particularly limited, but may be made from, for example, metals such as aluminum and copper, glass, wood, rubber, thermoplastic resins, thermosetting resins, or resins reinforced with reinforcing fibers or fillers. The thickness and shape of the substrate are also not particularly limited. The method for applying the aqueous dispersion composition of the present disclosure to the substrate is not particularly limited, but examples include application methods using a brush, spatula, roller, or caulking gun, as well as application methods using an air spray, nozzle spray, roll coater, or bead. The amount of application to the substrate can be appropriately determined depending on the purpose. For example, the aqueous dispersion composition of the present disclosure is applied to a thickness of 0.001 mm to 5 mm. The method for pouring the aqueous dispersion composition into a mold is not particularly limited. The aqueous dispersion composition is applied to the substrate or poured into a mold, and then the water is removed. The drying temperature in the water removal step is not particularly limited, but is typically set to 40 to 300°C. The drying time is not particularly limited, and is, for example, 0.2 to 2 hours when drying at 100°C.

[0094] The molded article thus obtained (a molded article obtained by applying the composition to a substrate and drying it) can be combined with another substrate and heated, for example, using a hot press at 120 to 300°C, optionally under pressure of 0.1 to 100 MPa, for 1 to 500 seconds to produce a molded article in which the substrates are bonded in layers. The substrates to be bonded may be of different types or the same type.

[0095] The aqueous dispersion composition of the present disclosure has excellent compatibility between the (C) surfactant and the (A) polyester block copolymer. Therefore, in the molded article obtained as described above, bleeding of the (C) surfactant is substantially not observed, and the various properties inherent to the (A) polyester block copolymer, i.e., adhesion to different materials, heat resistance, oil resistance, impact strength, tensile strength, vibration damping, flexibility, low-temperature properties, and flexural properties, are not impaired. As described in International Publication No. 2008 / 020520, aqueous polymer dispersion compositions can be used in a wide range of applications, including as materials for producing packaging films, automotive parts, sports-related products, medical devices, etc.; coating agents for nylon fibers and polyester fibers used in clothing materials, carpets, airbags, etc.; coating agents and gas barrier agents for paper and films; raw materials for foam rubber; sizing agents for fibrous materials such as synthetic fibers, natural fibers, and glass fibers; and raw materials for producing hoses, tubes, belts, gaskets, packing, etc. The aqueous dispersion composition of the present disclosure can also be used in a similar wide range of applications. The aqueous dispersion composition of the present disclosure can also be used as an adhesive.

[0096] It should be noted that in this specification, the term "comprising" includes "consisting essentially of" and "consisting of." In addition, the present disclosure encompasses all arbitrary combinations of the constituent elements described in this specification.

[0097] Furthermore, the various characteristics (properties, structures, functions, etc.) described in each embodiment of the present disclosure above may be combined in any way to specify the subject matter encompassed by the present disclosure, i.e., the present disclosure encompasses all subject matter consisting of any combination of the combinable characteristics described herein. [Example]

[0098] Hereinafter, the embodiments of the present disclosure will be described more specifically with reference to examples, but the embodiments of the present disclosure are not limited to the following examples.

[0099] Examples and Comparative Examples Example 1 A hopper was installed at the upstream end of a twin-screw extruder (model: MFU15 (manufactured by Technovel Co., Ltd.), shaft diameter: 15 mm, L / D: 90). A polyester block copolymer (product name: Hytrel 3001 (manufactured by Toray Celanese Co., Ltd.)) was added to the hopper at a rate of 3 kg / hr, an antioxidant (product name: Irganox 259 (manufactured by BASF Japan)) was added at a rate of 0.12 kg / hr, and an ethylene oxide-propylene oxide copolymer (product name: Newpol PE108 (manufactured by Sanyo Chemical Industries, Ltd.)) was added at a rate of 0.17 kg / hr. After melt-kneading at a cylinder temperature of 180 °C and a rotation speed of 750 rpm, a 14% by weight aqueous solution of ethylene oxide-propylene oxide copolymer (product name: Newpol PE108) was added at a rate of 0.96 kg / hr using a plunger pump from a second feed port located 315 mm from the upstream end of the twin-screw extruder. The materials were mixed and emulsified from the upstream end of the twin-screw extruder to a third feed port located 1175 mm from the tip at a cylinder temperature of 150°C, a rotation speed of 750 rpm, and a solids concentration (total of polyester block copolymer, ethylene oxide-propylene oxide copolymer, and antioxidant) of 81% by mass. Pure water was fed into the third feed port at a rate of 3.89 kg / hr using a plunger pump, and mixed from the third feed port to the outlet of the twin-screw extruder at a cylinder temperature of 90°C and a rotation speed of 750 rpm. The mixture was then discharged from the twin-screw extruder to obtain an aqueous polyester block copolymer dispersion composition.

[0100] The concentration of each component, such as the polyester block copolymer, in the resulting aqueous dispersion composition can be calculated from the addition rate of each component. For example, in this example, the addition rate of the polyester block copolymer is 3 kg / hr, the addition rate of the antioxidant is 0.12 kg / hr, the addition rate of the ethylene oxide-propylene oxide copolymer is 0.17 kg / hr, the addition rate of the ethylene oxide-propylene oxide copolymer (14% by mass aqueous solution) is 0.96 kg / hr, and the addition rate of the pure water is 3.89 kg / hr. Therefore, the total amount is 3 + 0.12 + 0.17 + 0.96 + 3.89 = 8.14 (kg / hr), and therefore the concentration of the polyester block copolymer is 3 / 8.14 ≒ 36.9% by mass. Example 2 (1) Using a 4-inch roll kneader (Test Mixing Roll 191-TM (Yasuda Seiki Seisakusho)) heated to 140°C, 100 g of a polyester block copolymer (product name: Hytrel 3001 (Toray Celanese Co., Ltd.)) and 4 g of an antioxidant (product name: Irganox 259 (BASF Japan)) were kneaded for 5 minutes, and then cooled to obtain a kneaded resin. (2) The procedure in (1) was repeated. (3) A 50 mm diameter, 1-liter pressure-resistant autoclave equipped with two 5 cm diameter, four-blade inclined paddle blades was charged with 160 g of the kneaded resin obtained in (1) and (2), 224 g of pure water, and 16 g of ethylene oxide-propylene oxide copolymer (trade name: Newpol PE108 (manufactured by Sanyo Chemical Industries, Ltd.)) and sealed. The autoclave was then purged with nitrogen gas, and the agitator was started. The autoclave was heated to 180°C while stirring at 500 rpm. After stirring for an additional 60 minutes while maintaining the internal temperature at 180°C, the contents were cooled to room temperature, yielding an aqueous polyester block copolymer dispersion composition.

[0101] (Comparative Example 1) A hopper was installed at the upstream end of a twin-screw extruder (model: MFU15 (manufactured by Technovel Co., Ltd.), shaft diameter: 15 mm, L / D: 90). A polyester block copolymer (product name: Hytrel 3001 (manufactured by Toray Celanese Co., Ltd.)) was added to the hopper at a rate of 3 kg / hr, and an ethylene oxide-propylene oxide copolymer (product name: Newpol PE108 (manufactured by Sanyo Chemical Industries, Ltd.)) was added at a rate of 0.17 kg / hr. After stirring at a cylinder temperature of 180°C and a rotation speed of 750 rpm, a 14% by weight aqueous solution of ethylene oxide-propylene oxide copolymer (product name: Newpol PE108 (manufactured by Sanyo Chemical Industries, Ltd.)) was added at a rate of 0.96 kg / hr using a plunger pump through a second feed port located 315 mm from the upstream end of the twin-screw extruder. The materials were mixed and emulsified from the upstream end of the twin-screw extruder to a third feed port located 1175 mm from the tip at a cylinder temperature of 150°C, a rotation speed of 750 rpm, and a solids concentration (total of polyester block copolymer, ethylene oxide-propylene oxide copolymer, and antioxidant) of 80% by mass. Pure water was fed into the third feed port at a rate of 3.73 kg / h using a plunger pump. Mixing was continued from the third feed port to the twin-screw extruder outlet at a cylinder temperature of 90°C and a rotation speed of 750 rpm. The mixture was then discharged from the twin-screw extruder to obtain an aqueous polyester block copolymer dispersion composition. (Comparative Example 2) A 50 mm diameter, 1 liter pressure-resistant autoclave equipped with two 9.5 cm diameter, four-blade inclined paddle blades was charged with 160 g of a polyester block copolymer (product name: Hytrel 3001 (manufactured by Toray Celanese Co., Ltd.)), 6.4 g of an antioxidant (BASF Japan Ltd. Irganox 259), 218 g of purified water, and 16 g of an ethylene oxide / propylene oxide copolymer (trade name: Newpol PE108 (manufactured by Sanyo Chemical Industries, Ltd.)) and sealed. The inside of the autoclave was then purged with nitrogen gas, and the agitator was started. The inside of the autoclave was heated to 180 ° C. while stirring at a rotation speed of 500 rpm. After stirring for another 60 minutes while maintaining the internal temperature at 180 ° C., the contents were cooled to room temperature to obtain a polyester block copolymer aqueous dispersion composition. (Comparative Example 3) The same procedure as in Comparative Example 1 was carried out, and 100 g of the obtained polyester block copolymer aqueous dispersion composition was placed in a 300 mL beaker. While stirring at 400 rpm using a stirrer equipped with four inclined paddle blades with a diameter of 5 cm, 1.6 g of an antioxidant (trade name: Irganox 259 (manufactured by BASF Japan)) was added, and the mixture was stirred for 30 minutes to obtain an aqueous dispersion composition. Comparative Example 4 The same procedure as in Comparative Example 1 was carried out, and 100 g of the obtained polyester block copolymer aqueous dispersion composition was placed in a 300 mL beaker. While stirring at 400 rpm using a magnetic stirrer, 1.6 g of an antioxidant (trade name: Irganox 259 (manufactured by BASF Japan)) was added, and the mixture was stirred for 30 minutes to obtain an aqueous dispersion composition. (Comparative Example 5) The same procedure as in Comparative Example 1 was carried out, and 100 g of the obtained polyester block copolymer aqueous dispersion composition was placed in a 300 mL beaker. While stirring at 2000 rpm using a high-speed stirring system TK Robomix (manufactured by Primix Corporation) equipped with a disperser blade having a diameter of 40 mm, 1.6 g of an antioxidant (trade name: Irganox 259 (manufactured by BASF Japan)) was added, and the mixture was stirred for 30 minutes to obtain an aqueous dispersion composition. (Comparative Example 6) A 50 mm diameter, 1-liter pressure-resistant autoclave equipped with two 9.5 cm diameter, four-blade inclined paddle blades was charged with 160 g of a polyester block copolymer (product name: Hytrel 3001 (manufactured by Toray Celanese Co., Ltd.)), 224 g of purified water, and 16 g of an ethylene oxide / propylene oxide copolymer (product name: Newpol PE108 (manufactured by Sanyo Chemical Industries, Ltd.)) and sealed. The autoclave was then purged with nitrogen gas, and the agitator was started. The autoclave was heated to 180 °C while stirring at 500 rpm. The contents were stirred for an additional 60 minutes while maintaining the internal temperature at 180 °C, after which the contents were cooled to room temperature. 6.4 g of an antioxidant (Irganox 259 (manufactured by BASF Japan Ltd.)) was added to the autoclave, and the mixture was stirred at 500 rpm for 30 minutes to obtain an aqueous polyester block copolymer dispersion composition.

[0102] The polyester block copolymer used, Hytrel 3001, is a polyester block copolymer having hard and soft segments, with the hard segments having a polybutylene terephthalate structure and the soft segments having an aliphatic polyether structure and / or an aliphatic polyester structure. The polyester block copolymer used is a polyester elastomer.

[0103] The structural formula of the antioxidant (Irganox 259) used is shown below.

[0104] [ka]

[0105] [Mechanical property measurement] Each aqueous dispersion composition was dried with hot air at 80°C for 12 hours or more to obtain pellets. 25 g of the pellets were placed in a mold measuring 15 cm in inner diameter x 15 cm x 1 mm in thickness, sandwiched between a PTFE-impregnated glass fabric sheet (ASONE model number: 128A-10T) and a SUS plate, and then heated using a hot press at 180°C for 3 minutes, a press time of 3 minutes, a press pressure of 2.3 MPa, and 8 pumping cycles. After cooling under pressure at 10°C for 1 minute, a No. 7 dumbbell-shaped test piece was obtained from the obtained resin sheet.

[0106] The above-mentioned dumbbell-shaped No. 7 tensile test specimen was subjected to an autograph (model number: AGS-X (Shimadzu Corporation)) with a flat gripping jig, fixing the top and bottom 11 mm apart (chuck distance 13 mm), and a tensile test was performed at a tension speed of 200 mm / min. Mechanical properties were measured, including modulus of elasticity, elongation, and breaking strength. The calculation methods were as follows. Ten samples were used for the measurement, and the average of a total of eight values, excluding the maximum and minimum values, was used as the measurement value for each property. Elastic modulus: Calculated from the slope of stress and strain between 0.01% and 5% strain Elongation rate: Calculated from stroke starting from 13mm distance between chucks (Example) If the test piece stretches 20 cm, the stretch rate is (200 + 13) / 13 x 100 = 1638% Breaking strength: Maximum stress at break [Heat degradation test] The above-mentioned dumbbell-shaped No. 7 tensile test piece was left in a hot air oven at 120°C for 336 hours. [Property change rate compared to raw resin] The mechanical properties (elastic modulus, elongation, and breaking strength) of the raw material resin (Hytrel 3001 (manufactured by Toray Celanese Co., Ltd.)) were also measured using the above method, and the mechanical properties (elastic modulus, elongation, and breaking strength) of the test pieces obtained from each aqueous dispersion composition were compared with those before the thermal degradation test. Specifically, the rate of change in physical properties relative to the raw material resin was calculated using the following formula. Note that when the rate of change in physical properties relative to the raw material resin for the elastic modulus, elongation, and breaking strength was all ±10% or less, it was evaluated as ○, and otherwise it was evaluated as ×.

[0107] Formula: Rate of change [%] of mechanical property value of raw resin = (each property value - each property value of raw resin) / each property value of raw resin

[0108] [Physical property maintenance rate] The mechanical properties (elastic modulus, elongation, and breaking strength) were measured before and after the thermal degradation test using the above method, and the property retention rate was calculated using the following formula: When the property retention rates of the elastic modulus, elongation, and breaking strength were all 50% or more, the sample was evaluated as O, and when any of them was less than 50%, the sample was evaluated as ×. Formula: Property retention rate [%] = Property value after thermal degradation test / Property value before thermal degradation test × 100

[0109] [Median particle size (D50)] 20 ml of water and 0.1 g of the aqueous dispersion composition obtained in each Example and Comparative Example were added to a 100 ml beaker, and ultrasonic waves were applied for 3 minutes while stirring with a spatula. The volume-average median particle size of the polyester block copolymer particles in the aqueous dispersion was measured using a laser diffraction particle size analyzer (model number: SALD2200, manufactured by Shimadzu Corporation). The refractive index was measured using a 1.6-0.1i index. Values ​​of 20 μm or less were evaluated as ◯, and values ​​of greater than 20 μm were evaluated as ×.

[0110] The results are summarized in Table 1. Table 2 also shows the actual measured mechanical properties of the aqueous dispersions obtained in each Example and Comparative Example before and after the thermal degradation test, as well as the measured mechanical properties of the raw material resins.

[0111] [Table 1]

[0112] [Table 2] [Industrial Applicability]

[0113] An aqueous dispersion composition containing a polyester block copolymer is provided, which is useful for environmental protection, for example, by enabling molded articles to be obtained without using organic solvents.

Claims

1. (1) melt-kneading (A) a polyester block copolymer and (B) an antioxidant to obtain a kneaded composition; and (2) mixing the obtained kneaded composition with (C) a surfactant and / or (D) an aqueous medium; A method for producing an aqueous dispersion composition, comprising:

2. (A) The polyester block copolymer contains a hard segment (a1) and a soft segment (a2), the hard segment (a1) is a segment containing at least one selected from the group consisting of a polybutylene terephthalate structure containing a structural unit derived from terephthalic acid and / or dimethyl terephthalate and a structural unit derived from 1,4-butanediol, and a polybutylene isophthalate structure containing a structural unit derived from isophthalic acid and / or dimethyl isophthalate and a structural unit derived from 1,4-butanediol; The method of claim 1.

3. The soft segment (a2) is a segment containing an aliphatic polyether structure and / or an aliphatic polyester structure. The aqueous dispersion composition according to claim 2.

4. The method according to any one of claims 1 to 3, wherein the antioxidant (B) is a phenolic antioxidant.

5. The method according to any one of claims 1 to 3, wherein the surfactant (C) contains an ethylene oxide / propylene oxide copolymer.

6. The method according to any one of claims 1 to 3, wherein the polyester block copolymer (A) contained in the resulting aqueous dispersion composition has a median particle size of 0.1 to 20 µm.

Images