Aqueous dispersion composition

Abstract

Provided is an aqueous dispersion composition of a polyester block copolymer, the aqueous dispersion composition being capable of preparing a molded body in which deterioration of mechanical properties when treated at a high temperature is suppressed. Specifically, the following aqueous dispersion composition is provided. An aqueous dispersion composition containing (A) a polyester block copolymer, (B) an antioxidant, (C) a surfactant, and (D) an aqueous medium, wherein (B) is a specific antioxidant having a group represented by the formula in the molecular structure.

Description

Aqueous dispersion composition

[0001] The present disclosure relates to aqueous dispersion compositions of polymers, and more particularly to aqueous dispersion compositions containing polyester block copolymers.

[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.

[0003] International Publication No. 2016 / 068206 JP 2011-102365 A JP 2009-215347 A JP 11-302513 A JP 2011-222451 A JP 2015-224258 A International Publication No. 2008 / 020520

[0004] However, molded articles obtained from aqueous dispersion compositions of polyester block copolymers may undergo thermal degradation at high temperatures. One aspect of the present disclosure aims to provide an aqueous dispersion composition of polyester block copolymers that can be used to prepare molded articles in which deterioration of mechanical properties is suppressed when treated at high temperatures.

[0005] One aspect of the present disclosure includes, for example, the subject matter described in the following items: Item 1. An aqueous dispersion composition comprising: (A) a polyester block copolymer; (B) an antioxidant; (C) a surfactant; and (D) an aqueous medium, wherein (B) is a compound represented by the following formula:

[0006]

[0007] Item 2. An aqueous dispersion composition comprising: (A) a polyester block copolymer; (B) an antioxidant; (C) a surfactant; and (D) an aqueous medium, wherein (B) is a group represented by formula (1):

[0008]

[0009] (In formula (1), R １ and R２ are the same or different and represent a hydrogen atom or a group represented by the formula (2a):

[0010]

[0011] (In formula (2a), R ｎａ represents —O— or —NH—, and n １ａ represents an integer of 1 to 20, and n ２ａ represents an integer of 0 to 3; １ and R ２ At least one of R represents a group represented by formula (2a), and when both represent a group represented by formula (2a), they may be the same or different, ３ and R ４ are the same or different and represent a hydrogen atom or a group represented by formula (2b):

[0012]

[0013] (In formula (2b), R ｎｂ represents —O— or —NH—, and n １ｂ represents an integer of 1 to 20, and n ２ｂ represents an integer of 0 to 3; ３ and R ４ When both represent a group represented by formula (2b), they may be the same or different, and m represents 0 or 1. Item 3. In formula (1), R １ and R ２ Both represent a group represented by formula (2a), and in formula (2a), n １ａ Item 4. The aqueous dispersion composition according to Item 2, wherein m is 0 and R is the same or different and represents an integer of 1 to 5. １ and R ２ is R １ represents a hydrogen atom, and R ２ represents a group represented by formula (2a), wherein n １ａItem 2: The aqueous dispersion composition according to Item 2, wherein represents an integer of 15 to 20. Item 5: The aqueous dispersion composition according to any one of Items 1 to 4, wherein (A) the polyester block copolymer comprises a hard segment (a1) and a soft segment (a2), and the hard segment (a1) is a segment comprising at least one selected from the group consisting of a polybutylene terephthalate structure comprising structural units derived from terephthalic acid and / or dimethyl terephthalate and structural units derived from 1,4-butanediol, and a polybutylene isophthalate structure comprising structural units derived from isophthalic acid and / or dimethyl isophthalate and structural units derived from 1,4-butanediol. Item 6: The aqueous dispersion composition according to Item 5, wherein the soft segment (a2) is a segment comprising an aliphatic polyether structure and / or an aliphatic polyester structure. Item 7: The aqueous dispersion composition according to any one of Items 1 to 6, wherein (C) the surfactant contains an ethylene oxide / propylene oxide copolymer. Item 8: Item 9. The aqueous dispersion composition according to any one of Items 1 to 7, further comprising (B') a sulfur-based antioxidant. Item 10. The aqueous dispersion composition according to any one of Items 1 to 8, satisfying at least one of the following conditions (α) to (δ): (α): The composition contains 20 to 60 mass% of the (A) polyester block copolymer. (β): The composition contains 0.5 to 15 mass parts of the (B) antioxidant per 100 parts by mass of the (A) polyester block copolymer. (γ): The composition contains 1 to 20 mass parts of the (C) surfactant per 100 parts by mass of the (A) polyester block copolymer. (δ): The composition contains 50 to 1,000 mass parts of the (D) aqueous medium per 100 parts by mass of the (A) polyester block copolymer.

[0014] According to one aspect of the present disclosure, there is provided an aqueous dispersion composition of a polyester block copolymer, which can suppress a decrease in the mechanical properties (at least one selected from the group consisting of elongation, elastic modulus, and breaking strength) of a molded article derived from the aqueous dispersion composition, even after a product obtained by using the aqueous dispersion composition for various applications is treated at high temperature.

[0015] Each embodiment included in the present disclosure will be described in more detail below. The present disclosure preferably includes an aqueous dispersion composition containing (A) a polyester block copolymer, (B) a specific antioxidant, (C) a surfactant, and (D) an aqueous medium, but is not limited thereto. The present disclosure includes all of the disclosures herein that would be recognized by a person skilled in the art.

[0016] The aqueous dispersion composition encompassed by the present disclosure may be referred to as the aqueous dispersion composition of the present disclosure.

[0017] The polyester block copolymer (A) 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 polyester block copolymer (A) is preferably a polyester elastomer.

[0018] 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.

[0019] 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.

[0020] Examples of ester-forming derivatives of aromatic dicarboxylic acids include lower alkyl esters, aryl esters, carbonate esters, and acid halides.

[0021] 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, and examples of combinations of aromatic dicarboxylic acids forming the two structural units include combinations of terephthalic acid and isophthalic acid, terephthalic acid and dodecanedioic acid, and 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.

[0022] Specific examples of the diol are preferably diols having a molecular weight of 400 or less, and more specific preferred examples include 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. Additionally, aliphatic diols having 2 to 10 carbon atoms and alicyclic diols having 5 to 10 ring members are preferred. Such diols may also be used in the form of ester-forming derivatives, such as acetylated forms and alkali metal salts. Two or more of these diols and their derivatives may be used in combination.

[0023] 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.

[0024] (i) can also be described as a polybutylene terephthalate structure containing structural units derived from terephthalic acid and / or dimethyl terephthalate and structural 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 structural units derived from 1,4-butanediol.

[0025] 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.

[0026] 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.

[0027] Examples of the aliphatic polyester having the aliphatic polyester structure include poly(ε-caprolactone), polyenantholactone, polycaprylolactone, polybutylene adipate, and polyethylene adipate.

[0028] 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.

[0029] 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 polybutylene adipate or polyethylene adipate.

[0030] The number average molecular weight of the aliphatic polyether structure and / or the aliphatic polyester structure is preferably about 300 to 6000. The number average molecular weight can be measured by NMR.

[0031] Although not particularly limited, the polyester block copolymer (A) is particularly preferably one in which the hard segment (a1) is a segment 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 the soft segment (a2) is a segment containing an aliphatic polyether structure and / or an aliphatic polyester structure. It is even more preferred that the soft segment (a2) is a segment containing 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.

[0032] 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.

[0033] The melting point of the polyester block copolymer (A) 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.

[0034] In the present disclosure, the melting point of the polyester block copolymer (A) is a value determined as follows.

[0035] That is, 5 mg of the polyester block copolymer to be measured is measured in a differential scanning calorimeter (DSC) by (i) raising the temperature from 30°C to 200°C and then lowering the temperature to -50°C, (ii) raising the temperature from -50°C to 200°C and then lowering the temperature to -50°C, and (iii) again raising the temperature from -50°C to 200°C and then lowering the temperature to 30°C, and the average value of the endothermic peak temperatures obtained during the temperature raising processes (ii) and (iii) is taken as the melting point.

[0036] An example of a differential scanning calorimeter (DSC) is DSC7020 (Hitachi High-Tech Science Corporation).

[0037] 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, and a monomer constituting an aliphatic polyether and / or an aliphatic polyester, preferably in the presence of a catalyst.

[0038] Commercially available products can also be used as the polyester block copolymer (A) used in the aqueous dispersion composition of the present disclosure. 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., and Vylon (registered trademark) GM-955 (melting point = 160°C) manufactured by Toyobo MC Co., Ltd.

[0039] In the aqueous dispersion composition of the present disclosure, the polyester block copolymer (A) may be used alone or in combination of two or more.

[0040] The antioxidant (B) used in the aqueous dispersion composition of the present disclosure is represented by the following formula:

[0041]

[0042] A compound having, in its molecular structure, one to four (1, 2, 3, or 4) such groups is preferred.

[0043] Among these, the antioxidant (B) is a compound represented by the formula (1):

[0044]

[0045] (In formula (1), R １ and R ２ are the same or different and represent a hydrogen atom or a group represented by the formula (2a):

[0046]

[0047] (In formula (2a), R ｎａ represents —O— or —NH—, and n １ａ represents an integer of 1 to 20, and n ２ａ represents an integer of 0 to 3; １ and R ２ At least one of R represents a group represented by formula (2a), and when both represent a group represented by formula (2a), they may be the same or different, ３ and R ４ are the same or different and represent a hydrogen atom or a group represented by formula (2b):

[0048]

[0049] (In formula (2b), R ｎｂ represents —O— or —NH—, and n １ｂ represents an integer of 1 to 20, and n ２ｂ represents an integer of 0 to 3; ３ and R ４ and when both represent a group represented by formula (2b), they may be the same or different, and m represents 0 or 1.

[0050] When m is 0, the compound represented by formula (1) is １ -R ２ (R １ and R ２ is the same as above.)

[0051] 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.

[0052] Also, as mentioned above, n ２ａ represents an integer of 0 to 3 (0, 1, 2, or 3), and particularly preferably represents 1.

[0053] 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.

[0054] Also, as mentioned above, n ２ｂ represents an integer of 0 to 3 (0, 1, 2, or 3), and particularly preferably represents 1.

[0055] 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 are the same or different (preferably the same) and represent an integer of 1 to 5.

[0056] Another preferred example of the antioxidant (B) is a compound represented by the formula (1), in which m is 0 and R １ represents 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.

[0057] 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.

[0058] Such (B) antioxidants are known compounds, or can be synthesized by modifying known compounds using easily conceivable methods. Alternatively, commercially available (B) antioxidants can be purchased and used. Examples of such commercially available products include Irganox 259 (melting point = 104°C), Irganox 1010 (melting point = 110°C), Irganox 1076 (melting point = 50°C), and Irganox 1098 (melting point = 156°C) (all manufactured by BASF Japan), Adekastab AO-50 (melting point = 51°C), and Adekastab AO-60 (melting point = 110°C) (all manufactured by ADEKA Corporation). The melting point of the (B) antioxidant can be determined by the same method as that for the melting point of the (A) polyester block copolymer described above. However, in the melting point measurement of (A), the temperature is raised to 200°C in each of the steps (i) to (iii), but in the melting point measurement of (B), the temperature is raised to 300°C and the melting point is measured.

[0059] (B) The antioxidants can be used alone or in combination of two or more.

[0060] The aqueous dispersion composition of the present disclosure may further contain, in addition to the antioxidant (B), another antioxidant. An antioxidant other than the antioxidant (B) may be referred to as an antioxidant (B').

[0061] As the (B') antioxidant, antioxidants other than the (B) antioxidant known in the present technical field can be preferably used, as long as they do not impair the effects of the aqueous dispersion composition of the present disclosure. Among them, sulfur-based antioxidants are preferred, and thioether-based antioxidants are more preferred, from the viewpoint that a resin composition (molded article) derived from the aqueous dispersion composition of the present disclosure can exhibit an even better effect of suppressing the decrease in mechanical properties (at least one of elongation, elastic modulus, and breaking strength) after treatment at high temperatures. By further including a sulfur-based antioxidant, the aqueous dispersion composition of the present disclosure can not only exhibit better mechanical properties (at least one of elongation, elastic modulus, and breaking strength), but also exhibit an effect of suppressing the decrease in mechanical properties even when exposed to high temperatures for a longer period of time than when the aqueous dispersion composition does not include a sulfur-based antioxidant.

[0062] More specific examples of such sulfur-based antioxidants include 2,4-bis(dodecylthiomethyl)-6-methylphenol, dioctadecyl 3,3'-thiodipropionate, 2-mercaptobenzimidazole, and dilauryl thiodipropionate.

[0063] The antioxidant (B') (preferably a sulfur-based antioxidant) may be used alone or in combination of two or more.

[0064] The antioxidant (B') may also be a commercially available product, such as Irganox 1726, Irganox PS 802FL (manufactured by BASF Japan), Sumilizer MB (manufactured by Sumitomo Chemical Co., Ltd.), Nocrac 400 (manufactured by Ouchi Shinko Chemical Industry Co., Ltd.), Adekastab AO-412S, Adekastab AO-503 (manufactured by ADEKA Corporation).

[0065] 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 viewpoint 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.

[0066] Polyvinyl alcohol is, for example, a polymer represented by the following formula (I): H(CH ２ CH(OH) ｊ (CH ２ CH (OCOCH ３ )) ｋ H (I) where the polymer represented by formula (I) is (CH ２ CH(OH)) and (CH ２ CH (OCOCH ３ )) are randomly arranged.

[0067] 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.

[0068] 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.

[0069] The degree of saponification of polyvinyl alcohol is not particularly limited, but is preferably 70 to 99 mol %, more preferably 85 to 95 mol %.

[0070] The ethylene oxide / propylene oxide copolymer is not particularly limited as long as it is within a range that can obtain the desired effect, and is, for example, a block copolymer represented by the following formula (II): HO(CH ２ CH ２ O) ｐ (CH ２ CH (CH ３ ) O) ｑ (CH ２ CH ２ O) ｒ H (II)

[0071] In formula (II), p, q, and r each represent the number of moles added, where p represents, for example, an integer of 2 to 300, q represents, for example, an integer of 10 to 150, and r represents, for example, an integer of 2 to 300. These may be the same as or different from each other.

[0072] The mass average molecular weight of the ethylene oxide / propylene oxide copolymer is not particularly limited, but is, for example, 3,000 to 30,000, preferably 6,000 to 25,000, and particularly preferably 8,000 to 20,000. 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. The mass average molecular weight can be determined by GPC, and the content of the monomer units can be determined by NMR.

[0073] 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 a molded article. The melting point can be determined by the same method as for the melting point of the polyester block copolymer (A) described above.

[0074] The surfactant (C) may 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.

[0075] 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.

[0076] The content of the polyester block copolymer (A) 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 disclosure, and may be, for example, about 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% by mass, 10 to 50% by mass, 20 to 45% by mass, or 25 to 40% by mass.

[0077] 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.

[0078] When the aqueous dispersion composition of the present disclosure contains an antioxidant (B') (preferably a sulfur-based antioxidant), the content of the antioxidant (B') is preferably 0.1 to 10 parts by mass relative to 100 parts by mass of the polyester block copolymer (A). The upper or lower limit of this range may be, for example, 0.2, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, or 9 parts by mass. For example, the range is more preferably 0.2 to 8 parts by mass, and even more preferably 0.5 to 6 parts by mass. Furthermore, although depending on the amount of the polyester block copolymer (A), the content of the antioxidant (B') in the aqueous dispersion composition is preferably about 0.05 to 2% by mass, and more preferably about 0.1 to 1% by mass.

[0079] 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 17 parts by mass, even more preferably 4 to 15 parts by mass, and even more preferably 5 to 12 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 7% by mass, more preferably about 1 to 5% by mass, and even more preferably about 2 to 4% by mass.

[0080] The amount of the aqueous medium (D) used is not particularly limited, but is set to, for example, 50 to 1,000 parts by mass, and preferably 50 to 250 parts by mass, per 100 parts by mass of the polyester block copolymer (A). 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.

[0081] The aqueous dispersion composition of the present disclosure may contain other components 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.

[0082] 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).

[0083] 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.

[0084] In the aqueous dispersion composition of the present disclosure, the average particle size of the polyester block copolymer (A) is, for example, 0.1 to 20 μm, 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 that is more 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 measurement method.

[0085] 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.

[0086] The present disclosure further provides a method for producing the aqueous dispersion composition of the present disclosure. The aqueous dispersion composition of the present disclosure can be produced, for example, by a method of emulsifying and dispersing (A) a polyester block copolymer in (D) an aqueous medium in the presence of the specific (B) surfactant and (C) surfactant described above. More specifically, the aqueous dispersion composition of the present disclosure can be produced, for example, by the following method.

[0087] First, (A) polyester block copolymer, (B) antioxidant, (C) surfactant, and (D) aqueous medium are charged into a reactor to prepare a mixture thereof. The order in which these components are charged into the reactor is not particularly limited as long as the effects of the present invention can be obtained. For example, a preferred method is to melt and knead (A) and (B), and then further mix (C) and (D) therewith.

[0088] The apparatus used in preparing and emulsifying the mixture is preferably an apparatus equipped with a heating means capable of heating to a temperature equal to or higher than the melting point of the (A) polyester block copolymer or lower than the melting point of the (A) polyester block copolymer, and a stirring means capable of applying a shear force to the contents, such as a pressure-resistant autoclave equipped with a stirrer, a twin-screw extruder, or a kneader, with a twin-screw extruder being particularly preferred.

[0089] Next, the mixture is stirred (preferably while heating) to emulsify the mixture. The resulting emulsion is then cooled to room temperature to obtain the desired aqueous dispersion composition of the (A) polyester block copolymer. The method for applying heat to the (A) polyester block copolymer is not particularly limited. Heat can be applied by heating using a heater or the like, or by applying strong mechanical shear force. The heating temperature is not particularly limited. However, in order to reduce the thermal history of the (A) polyester block copolymer, the mixture is emulsified, for example, at a temperature between 40°C lower than the melting point of the (A) polyester block copolymer and 100°C higher than the melting point. Preferably, the mixture is emulsified at a temperature between 30°C lower than the melting point of the (A) polyester block copolymer and 60°C higher than the melting point. Specifically, the mixture can be emulsified at a temperature in the range of 65°C to 325°C. In the present disclosure, emulsification at a temperature lower than the melting point can suppress decomposition of the (A) polyester block copolymer due to thermal history.

[0090] The rotation speed, stirring time, temperature, etc. during stirring are appropriately adjusted so that the average particle size of the polyester block copolymer (A) is set to, for example, within the range of 0.1 to 20 μm. When preparing an aqueous dispersion composition that also contains the other components (for example, surfactant and / or polymer dispersion stabilizer (B')), the method for adding the other components is not particularly limited. For example, the other components may be added when preparing a mixed solution of (A) to (D), or may be added to an emulsion that has been cooled to room temperature.

[0091] A resin composition (molded article) derived from the aqueous dispersion composition of the present disclosure exhibits excellent mechanical properties (at least one mechanical property selected from the group consisting of 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, deterioration of at least one mechanical property selected from the group consisting of elongation, elastic modulus, and breaking strength is significantly suppressed.

[0092] A molded article can be produced using the aqueous dispersion composition of the present disclosure. The method for producing the 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 production method including such steps can produce molded articles in various forms, such as a coating, film, or sheet containing (A) to (C).

[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, caulking gun, etc., and application methods using air sprays, nozzle sprays, roll coaters, beads, etc. The amount of coating on the substrate can be appropriately determined depending on the purpose. For example, the aqueous dispersion composition of the present disclosure is applied so that the thickness is 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 for example, when drying at 100°C, it is 0.2 to 2 hours.

[0094] Furthermore, for example, a molded article in which the substrates are bonded in layers can be produced by combining the molded article thus obtained (a molded article obtained by applying the composition to a substrate and drying it) with another substrate, and heating the resulting mixture for 1 to 500 seconds at 120 to 300°C, optionally under pressure of 0.1 to 100 MPa, using a hot press. 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 surfactant (C) and the polyester block copolymer (A).In addition, the aqueous dispersion composition of the present disclosure can be used in a wide range of applications, such as materials for producing packaging films, automobile parts, sports-related products, medical equipment, 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, etc.; raw materials for foam rubber; sizing agents for fiber materials such as synthetic fibers, natural fibers, and glass fibers; or raw materials for producing hoses, tubes, belts, gaskets, packing, etc.In addition, 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." Furthermore, the present disclosure encompasses any and all 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 identify 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.

[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 tip of a twin-screw extruder (model: MFU15 (manufactured by Technovel Co., Ltd.), shaft diameter: 15 mm, L / D: 90), and a polyester block copolymer (product name: Hytrel 3001 (manufactured by Toray Celanese Co., Ltd.)) was fed into the hopper at a rate of 3 kg / hr, an antioxidant (product name: Irganox 259 (manufactured by BASF Japan)) 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.)) 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 mass aqueous solution of ethylene oxide-propylene oxide copolymer (trade name: Newpol PE108) was fed at a rate of 0.96 kg / hr using a plunger pump from a second feed port provided at a position 315 mm from the upstream tip of the twin-screw extruder. From the upstream tip of the twin-screw extruder to a third feed port provided at a position 1175 mm, the mixture was kneaded and emulsified under conditions of 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 at a rate of 3.89 kg / hr using a plunger pump from the third feed port, and kneading was performed 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 was 3 kg / hr, the addition rate of the antioxidant was 0.12 kg / hr, the addition rate of the ethylene oxide-propylene oxide copolymer was 0.17 kg / hr, the addition rate of the ethylene oxide-propylene oxide copolymer (14% by mass aqueous solution) was 0.96 kg / hr, and the addition rate of the pure water was 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 × 100 ≒ 36.9% by mass. Furthermore, for example, the concentration of the antioxidant is 0.12 / 8.14 × 100 ≒ 1.47% by mass. For example, the concentration of an ethylene oxide-propylene oxide copolymer is (0.17+0.96×0.14) / 8.14×100≈3.74% by mass.

[0101] Example 2 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Irganox 1010 (manufactured by BASF Japan) was used as the antioxidant.

[0102] Example 3 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Irganox 1098 (manufactured by BASF Japan) was used as the antioxidant.

[0103] Example 4 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Irganox 1076 (manufactured by BASF Japan) was used as the antioxidant.

[0104] Example 5 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Adekastab AO-50 (manufactured by ADEKA Corporation) was used as the antioxidant.

[0105] Example 6 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Hytrel 3046 (manufactured by Toray Celanese Co., Ltd.) was used as the polyester block copolymer and Newpol PE128 (manufactured by Sanyo Chemical Industries, Ltd.) was used as the ethylene oxide-propylene oxide copolymer.

[0106] Example 7 An aqueous dispersion composition was obtained by the same procedure as in Example 1, except that Hytrel 3046 was used as the polyester block copolymer, the supply rate of Irganox 259 was set to 0.09 kg / hr, and Adekastab AO412S (manufactured by ADEKA) was additionally added as an antioxidant at a supply rate of 0.03 kg / hr.

[0107] Example 8 An aqueous dispersion composition was obtained by the same procedure as in Example 1, except that Hytrel 3046 was used as the polyester block copolymer, the supply rate of Irganox 259 was set to 0.06 kg / hr, and Adekastab AO412S (manufactured by ADEKA) was additionally added as an antioxidant at a supply rate of 0.06 kg / hr.

[0108] Example 9 An aqueous dispersion composition was obtained by the same procedure as in Example 1, except that Hytrel 3046 was used as the polyester block copolymer, the supply rate of Irganox 259 was set to 0.03 kg / hr, and Adekastab AO412S (manufactured by ADEKA) was additionally added as an antioxidant at a supply rate of 0.09 kg / hr.

[0109] Example 10 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Hytrel 4057N (manufactured by Toray Celanese Co., Ltd.) was used as the polyester block copolymer and Newpol PE128 (manufactured by Sanyo Chemical Industries, Ltd.) was used as the ethylene oxide-propylene oxide copolymer.

[0110] Example 11 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Vylon GM-915 (manufactured by Toyobo MC Co., Ltd.) was used as the polyester block copolymer.

[0111] Example 12 An aqueous dispersion composition was obtained by the same operation as in Example 1, except that Vylon GM-955 (manufactured by Toyobo MC Co., Ltd.) was used as the polyester block copolymer, the supply rate of Irganox 259 was set to 0.06 kg / hr, and Adekastab AO412S (manufactured by ADEKA) was additionally added as a further antioxidant at a supply rate of 0.06 kg / hr.

[0112] (Comparative Example 1) A hopper was installed at the upstream tip of a twin-screw extruder (model: MFU15 (manufactured by Technovel Co., Ltd.), shaft diameter: 15 mm, L / D: 90), and a polyester block copolymer (product name: Hytrel 3001 (manufactured by Toray Celanese Co., Ltd.)) was added at a rate of 3 kg / hr, and an ethylene oxide-propylene oxide copolymer (trade 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 mass% aqueous solution of ethylene oxide-propylene oxide copolymer (trade name: Newpol PE108) was added at a rate of 0.96 kg / hr using a plunger pump from a second feed port provided at a position 315 mm from the upstream tip of the twin-screw extruder. The mixture was emulsified by kneading from the upstream tip of the twin-screw extruder to a third feed port located 1,175 mm from the tip at a cylinder temperature of 150°C, a rotation speed of 750 rpm, and a solids concentration (polyester block copolymer and ethylene oxide-propylene oxide copolymer) of 80% by mass. Pure water was supplied from the third feed port using a plunger pump at a rate of 3.73 kg / hour, and kneading was performed 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.

[0113] Comparative Example 2 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Irganox 1330 (manufactured by BASF Japan) was used as the antioxidant.

[0114] Comparative Example 3 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Adekastab AO-20 (manufactured by ADEKA Corporation) was used as the antioxidant.

[0115] Comparative Example 4 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Adekastab AO-30 (manufactured by ADEKA Corporation) was used as the antioxidant.

[0116] Comparative Example 5 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Adekastab AO-40 (manufactured by ADEKA Corporation) was used as the antioxidant.

[0117] Comparative Example 6 An aqueous dispersion composition was obtained in the same manner as in Example 1, except that Adekastab AO-80 (manufactured by ADEKA Corporation) was used as the antioxidant.

[0118] The polyester block copolymers used, namely, Hytrel 3001 (HT3001), Hytrel 3046 (HT3046), Hytrel 4057N (HT4057N), Vylon GM-915, and Vylon GM-955, are all polyester block copolymers having hard segments and soft segments, with the hard segments being segments having a polybutylene terephthalate structure and the soft segments being segments having an aliphatic polyether structure and / or an aliphatic polyester structure. Furthermore, all of the polyester block copolymers used are polyester elastomers.

[0119] The structural formulas of the antioxidants used are shown below. ADK STAB AO412S (manufactured by ADEKA) is a sulfur-based antioxidant. The melting points of the antioxidants used (specifically, the lower limit of the melting point in the catalog for each antioxidant) are also shown in Table 1.

[0120]

[0121]

[0122]

[0123]

[0124]

[0125]

[0126]

[0127]

[0128]

[0129]

[0130] [Mechanical Property Measurement] Each aqueous dispersion composition obtained 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 with an inner diameter of 15 cm x 15 cm x 1 mm thickness, and sandwiched between a PTFE-impregnated glass fabric sheet (ASONE model number: 128A-10T) and a SUS plate. Then, using a hot press, the pellets were heated at 180°C for 3 minutes, a preheating time of 3 minutes, a pressing time of 3 minutes, a pressing pressure of 2.3 MPa, and 8 pumping cycles. After cooling under pressure at 10°C for 1 minute, a dumbbell-shaped No. 7 test piece (JIS K 6251) was obtained from the obtained resin sheet.

[0131] The above-mentioned dumbbell-shaped No. 7 tensile test specimen was subjected to a tensile test using 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), at a tension speed of 200 mm / min. The mechanical properties, elastic modulus, elongation, and breaking strength, were confirmed. The calculation methods were as follows. Ten samples were measured, and the average value of a total of eight points excluding the maximum and minimum values ​​was used as the measured value for each property. Elastic modulus: Calculated from the stress and strain slope between 0.01% and 5% strain. Elongation: Calculated from the stroke from a chuck distance of 13 mm. (Example) When the test specimen is stretched 20 cm, the elongation is (200 + 13) / 13 x 100 = 1638%. Breaking strength: Maximum stress at break

[0132] [Heat Degradation Test] The above-mentioned dumbbell-shaped No. 7 tensile test specimen was left for 336 hours in a hot air oven at 120° C. The tensile test specimens obtained from the aqueous dispersion compositions of Examples 7 to 9 and 12 were also subjected to a separate test of leaving them for 1000 hours.

[0133] [Property Retention Rate] The mechanical properties (elastic modulus, elongation, and breaking strength) before and after the thermal degradation test were measured by the above-mentioned method, and the property retention rate was calculated by the following formula. When any of the property retention rates of the elastic modulus, elongation, and breaking strength was less than 50%, it was evaluated as ×. When both the property retention rates of the elastic modulus and breaking strength were 50% or more, it was evaluated as ○. Formula: Property retention rate [%] = property value after thermal degradation test / property value before thermal degradation test × 100

[0134] The results are summarized in Table 1. Furthermore, actual measured values ​​before and after the thermal degradation test for test pieces prepared from the aqueous dispersion compositions obtained in each Example and Comparative Example are shown in Tables 2A and 2B. Table 2A shows the results after leaving the test pieces for 336 hours in the thermal degradation test, and Table 2B shows the results after leaving the test pieces for 1000 hours in the thermal degradation test. In Table 2A, a hyphen indicates that no measurement was performed.

[0135]

[0136]

[0137] The present invention provides an aqueous dispersion composition containing a polyester block copolymer that can be used to prepare molded articles that exhibit reduced deterioration in mechanical properties when exposed to high temperatures. This composition is useful for environmental protection, as it allows molded articles to be obtained without using organic solvents.

Claims

1. An aqueous dispersion composition comprising: (A) a polyester block copolymer; (B) an antioxidant; (C) a surfactant; and (D) an aqueous medium, wherein (B) is a compound represented by the following formula: and a melting point of 200°C or less.

2. An aqueous dispersion composition comprising: (A) a polyester block copolymer; (B) an antioxidant; (C) a surfactant; and (D) an aqueous medium, wherein (B) is a compound represented by formula (1): (In formula (1), R １ and R ２ are the same or different and represent a hydrogen atom or a group represented by the formula (2a): (In formula (2a), R ｎａ represents —O— or —NH—, and n １ａ represents an integer of 1 to 20, and n ２ａ represents an integer of 0 to 3; １ and R ２ At least one of R represents a group represented by formula (2a), and when both represent a group represented by formula (2a), they may be the same or different, ３ and R ４ are the same or different and represent a hydrogen atom or a group represented by formula (2b): (In formula (2b), R ｎｂ represents —O— or —NH—, and n １ｂ represents an integer of 1 to 20, and n ２ｂ represents an integer of 0 to 3; ３ and R ４ and when both represent a group represented by formula (2b), they may be the same or different, and m represents 0 or 1.

3. In formula (1), R １ and R ２ Both represent a group represented by formula (2a), and in formula (2a), n １ａ The aqueous dispersion composition according to claim 2 , wherein are the same or different and represent an integer of 1 to 5.

4. In formula (1), m represents 0, and R １ and R ２ is R １ represents a hydrogen atom, and R ２ represents a group represented by formula (2a), wherein n １ａ The aqueous dispersion composition according to claim 2 , wherein represents an integer of 15 to 20.

5. The aqueous dispersion composition according to any one of claims 1 to 4, wherein the polyester block copolymer (A) comprises a hard segment (a1) and a soft segment (a2), and the hard segment (a1) is a segment comprising at least one selected from the group consisting of a polybutylene terephthalate structure comprising structural units derived from terephthalic acid and / or dimethyl terephthalate and structural units derived from 1,4-butanediol, and a polybutylene isophthalate structure comprising structural units derived from isophthalic acid and / or dimethyl isophthalate and structural units derived from 1,4-butanediol.

6. The aqueous dispersion composition according to claim 5, wherein the soft segment (a2) is a segment containing an aliphatic polyether structure and / or an aliphatic polyester structure.

7. The aqueous dispersion composition according to any one of claims 1 to 4, further comprising (B') a sulfur-based antioxidant.

8. The aqueous dispersion composition according to any one of claims 1 to 4, wherein the surfactant (C) contains an ethylene oxide / propylene oxide copolymer.

9. The aqueous dispersion composition according to any one of claims 1 to 4, which satisfies at least one of the following conditions (α) to (δ): (α): 20 to 60 mass % of (A) polyester block copolymer is contained. (β): 0.5 to 15 mass parts of (B) antioxidant is contained per 100 mass parts of (A) polyester block copolymer. (γ): 1 to 20 mass parts of (C) surfactant is contained per 100 mass parts of (A) polyester block copolymer. (δ): 50 to 1,000 mass parts of (D) aqueous medium is contained per 100 mass parts of (A) polyester block copolymer.

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