Resin compositions and their uses

Abstract

The present invention aims to provide a composition suitable for use in footwear components such as soles, which can be used to produce molded articles such as foams and laminates that exhibit an excellent balance between rebound elasticity and compression set (CS), as well as foams and laminates using this composition, and footwear components using these. [Solution] The solution comprises an acid-modified ethylene polymer (A) and a polyamide (B), wherein the acid-modified ethylene polymer (A) is present in an amount of 60 to 95 parts by mass and the polyamide (B) is present in an amount of 5 to 40 parts by mass per 100 parts by mass of the total amount of the acid-modified ethylene polymer (A) and the polyamide (B), and the density of the acid-modified ethylene polymer (A), measured at 25°C in accordance with ASTM D1505, is 850 to 885 kg / m³. 3 A resin composition within the range of [specified range].

Description

[Technical Field]

[0001] This invention relates to resin compositions and their uses. [Background technology]

[0002] Footwear and footwear components, specifically the soles (mainly midsoles) of sports shoes, require lightweight materials that resist deformation from prolonged use and possess the mechanical strength and resilience to withstand harsh usage conditions. Therefore, cross-linked resin foams are used in these materials.

[0003] For shoe soles, cross-linked foams made by cross-linking ethylene-vinyl acetate copolymer (EVA), an ethylene-polar monomer copolymer, with peroxides have been widely used. However, cross-linked foams molded using this ethylene-vinyl acetate copolymer have a relatively high specific gravity and a large compression set. Therefore, when used for shoe soles, for example, they are heavy, and prolonged use causes the soles to compress, resulting in a loss of mechanical strength such as rebound elasticity. For this reason, in order to further improve the compression set and mechanical strength of ethylene-vinyl acetate copolymer-based foams, blends with polyolefin rubbers such as ethylene-1-butene rubber (EBR) and ethylene-octene rubber (EOR), which have better cross-linking efficiency than ethylene-vinyl acetate copolymer, have been attempted.

[0004] Furthermore, since it is known that materials with lower crystallinity have better rebound elasticity, blends of ethylene-vinyl acetate copolymer (EVA) and ethylene-propylene-diene copolymer (EPDM) have been attempted, especially when high rebound elasticity is required. However, in this case, there are problems with insufficient heat shrinkage and mechanical strength, and it was sometimes necessary to add more highly crystalline polyolefin rubber to compensate for the lack of mechanical strength.

[0005] On the other hand, polyamide resins (also called polyamides) are known as resins with high mechanical strength. Various attempts have been made to improve properties such as mechanical strength by combining polyamide resins with olefin copolymers such as ethylene-propylene random copolymers.

[0006] For example, Patent Document 1 discloses a composition comprising an ethylene-α-olefin copolymer rubber such as ethylene-propylene-ethylidene norbornene copolymer, a polyamide, and a modified olefin polymer such as maleic anhydride-modified ethylene-1-butene copolymer. A method is described in which the materials are blended and then co-crosslinked with a crosslinking agent. While this composition improves oil resistance and mechanical strength, it tends to have poor moldability due to a significant decrease in fluidity.

[0007] Furthermore, Patent Document 2 describes a polyamide resin composition comprising a polyamide resin and a graft-modified ethylene-α-olefin random copolymer obtained by graft-modifying an ethylene-α-olefin random copolymer obtained from ethylene and an α-olefin having 6 to 20 carbon atoms. This composition mainly consists of a polyamide resin and aims to improve the flexibility, low-temperature impact resistance, water absorption resistance, saltwater resistance, and moldability of the polyamide resin composition.

[0008] Furthermore, Patent Document 3 discloses a thermoplastic elastomer composition comprising a functional group-containing ethylene copolymer, obtained by modifying a copolymer of ethylene and an α-olefin having 6 or more carbon atoms with a vinyl monomer containing a functional group such as an acid anhydride, and a polyamide resin. Patent Document 3 shows that a molded article obtained from the thermoplastic elastomer composition has improved oil resistance compared to a molded article obtained from a thermoplastic elastomer composition using an olefin with fewer than 6 carbon atoms as the α-olefin. [Prior art documents] [Patent Documents]

[0009] Patent Document 1 Japanese Patent Application Laid-Open No. 63-041554 Patent Document 2 Japanese Patent Application Laid-Open No. 09-087475 Patent Document 3 Japanese Patent Application Laid-Open No. 2000-290446 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] The present invention is suitable for applications of footwear parts such as soles, and provides a composition capable of producing molded bodies such as foams and laminates, foams and laminates using the composition, and footwear parts using the same, which are excellent in the balance between resilience and compression set (CS). MEANS FOR SOLVING THE PROBLEMS

[0011] As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved by combining a specific acid-modified ethylene-based polymer (A) and a polyamide (B) at a specific ratio, and have completed the present invention.

[0012] The present invention relates to the following [1] to

[13] . [1] A resin composition containing an acid-modified ethylene-based polymer (A) and a polyamide (B), wherein the content of the acid-modified ethylene-based polymer (A) is 60 to 95 parts by mass and the content of the polyamide (B) is 5 to 40 parts by mass with respect to a total of 100 parts by mass of the acid-modified ethylene-based polymer (A) and the polyamide (B), and the density of the acid-modified ethylene-based polymer (A) measured under the conditions of 25°C in accordance with ASTM D1505 is in the range of 850 to 885 kg / m

[0013] ,

[0011] , resin composition.<00​​​​​

[0014] [3] The resin composition according to [1] or [2], wherein the acid-modified ethylene polymer (A) has a melt flow rate in the range of 0.05 to 100 g / 10 min, as measured under conditions of 190°C and a 2.16 kg load in accordance with ASTM D1238.

[0015] [4] The resin composition according to any one of [1] to [3], wherein the acid modification amount of the acid-modified ethylene polymer (A) is in the range of 0.2 to 5.0% by mass.

[0016] [5] The resin composition according to any one of [1] to [4], wherein the polyamide (B) is at least one polyamide selected from the group consisting of polyamide 6, polyamide 66, polyamide 612, polyamide 11, and polyamide 12.

[0017] [6] A foam comprising the resin composition described in any of [1] to [5].

[0018] [7] Footwear containing the foam described in [6].

[0019] [8] Footwear components containing the foam described in [6].

[0020] [9] The footwear component described in [8] is a sole, insole, half insole, midsole, inner sole, or outsole.

[0021]

[10] [6] A layer consisting of the foam described above, A layer made of at least one material selected from the group consisting of polyolefin, polyurethane, rubber, leather, and artificial leather. A laminate having the following characteristics.

[0022]

[11] Footwear including the laminate described in

[10] .

[0023]

[12] A footwear part including the laminate described in

[10] .

[0024]

[13] The footwear part according to

[12] , wherein the footwear part is a sole, an insole of a shoe, a half insole, a midsole, an inner sole or an outsole. [Advantages of the Invention]

[0025] According to the present invention, there can be provided a composition capable of producing molded bodies such as foams and laminates, which is suitable for use in footwear parts such as soles, and is excellent in the balance between resilience and compression set (CS) and the like, foams and laminates using the composition, footwear parts using them, and footwear. [Modes for Carrying Out the Invention]

[0026] Hereinafter, the present invention will be specifically described. In this specification, "~" indicating a numerical range means, for example, when expressed as "M~N" (where M and N are numerical values satisfying M≠N), unless otherwise specified, "M or more and N or less" when M < N, and "M or less and N or more" when M > N. Also, the unit described after either one of the numerical values before and after "~" is the unit of both the numerical values described before and after "~" unless otherwise specified. Also, when the numerical ranges are described stepwise, the upper and lower limits of each numerical range can be arbitrarily combined.

[0027] In this specification, a combination of two or more preferred embodiments is a more preferred embodiment. In this specification, the term "polymer" or "(co)polymer" is used to include homopolymers and copolymers unless otherwise specified.

[0028] In this specification, when M is an olefin constituting a polymer, the expression "constituent unit derived from M" is sometimes used. This refers to "the constituent unit corresponding to M," that is, a constituent unit having a pair of bonds formed when the π bond constituting the double bond of M opens.

[0029] [Resin composition] The resin composition of the present invention is It contains an acid-modified ethylene polymer (A) and a polyamide (B), With respect to 100 parts by mass of the total of the acid-modified ethylene polymer (A) and the polyamide (B), the content of the acid-modified ethylene polymer (A) is 60 to 95 parts by mass, and the content of the polyamide (B) is 5 to 40 parts by mass.

[0030] <Acid-modified ethylene polymer (A)> The resin composition according to the present invention contains an acid-modified ethylene polymer (A) (hereinafter also simply referred to as "component (A)"). The acid-modified ethylene polymer (A) used in this invention has a density of 850-885 kg / m³ measured at 25°C in accordance with ASTM D1505. 3 It is within the range.

[0031] The density is preferably 855-880 kg / m³ 3 , more preferably 858-875 kg / m 3 More preferably 861-870 kg / m 3 It falls within this range. The combination of the upper and lower limits of density is arbitrary; for example, 861-885 kg / m³. 3 It is also possible to do so. When the density of the acid-modified ethylene polymer (A) is within the aforementioned range, a resin composition with high rebound elasticity, excellent durability (compression set), and moderate flexibility is obtained, which is preferable.

[0032] The acid-modified ethylene polymer (A) used in the present invention preferably has a melt flow rate (MFR2.16) measured under the conditions of 190 °C and a load of 2.16 kg in accordance with ASTM D1238 in the range of 0.05 to 100 g / 10 min.

[0033] The MFR2.16 is preferably in the range of 0.10 to 50 g / 10 min, more preferably in the range of 0.30 to 20 g / 10 min, still more preferably in the range of 0.50 to 10 g / 10 min, and even more preferably in the range of 0.50 to 5.0 g / 10 min. The combination of the upper and lower limit values of MFR2.16 is arbitrary, and for example, it can also be set to 1.0 to 100 g / 10 min. When the MFR2.16 of the acid-modified ethylene polymer (A) is within the above range, it is preferable because the resin composition has appropriate moldability.

[0034] Also, the range of the MFR2.16 may be changed in relation to the density. For example, when the density is 870 kg / m 3 in the following cases (for example, in the range of 855 to 870 kg / m 3 or in the range of 861 to 870 kg / m 3 ), the MFR2.16 may be set to 0.30 to 20 g / 1 / 0 min, 0.50 to 10 g / 10 min, or 0.50 to 5.0 g / 10 min. When the density exceeds 870 kg / m 3 (for example, in the range exceeding 870 kg / m 3 and up to 885 kg / m 3 or in the range exceeding 870 kg / m 3 and up to 875 kg / m 3 ), the MFR2.16 may be set to 1.0 to 10 g / 10 min or 1.0 to 5.0 g / 10 min.

[0035] The amount of acid modification of the acid-modified ethylene polymer (A) used in the present invention is preferably in the range of 0.2 to 5.0% by mass based on 100% by mass of the acid-modified ethylene polymer (A). The amount of acid modification is preferably in the range of 0.25 to 4.0% by mass, and more preferably in the range of 0.3 to 3.5% by mass. The combination of the upper and lower limits for the amount of acid modification is arbitrary.

[0036] When the acid modification amount of the acid-modified ethylene polymer (A) falls within the aforementioned range, a resin composition with an excellent balance between rebound elasticity and compression set (CS) can be obtained. The acid modification amount can be calculated by an appropriate method; for example, if the acid-modified ethylene polymer (A) is a maleic anhydride-modified ethylene polymer, it can be calculated by measuring FT-IR under the conditions described in the examples below.

[0037] When the amount of acid modification is above the lower limit of the above range, the compression set (CS) of the molded article obtained from the resin composition containing the acid-modified ethylene polymer (A) tends to be reduced, meaning it tends to have sufficient durability, which is preferable. On the other hand, when the amount of acid modification is below the upper limit of the above range, the fluidity of the resin composition does not decrease excessively, ensuring sufficiently high moldability, suppressing gel formation, and tending to maintain the appearance of the molded article to a certain extent.

[0038] The resin composition of the present invention may contain one acid-modified ethylene polymer (A) alone, or it may contain two or more types of acid-modified ethylene polymers. The acid-modified ethylene polymer (A) used in the present invention is obtained by acid-modifying an unmodified ethylene polymer (A0) (hereinafter sometimes simply referred to as "ethylene polymer (A0)").

[0039] Ethylene-based polymer (A0) The ethylene polymer (A0) that gives the acid-modified ethylene polymer (A) is an unmodified polymer mainly containing constituent units derived from ethylene, and includes ethylene homopolymers or copolymers of ethylene and α-olefins. Specifically, the content of constituent units derived from ethylene in the total constituent units of the ethylene polymer (A0) is more than 50 mol% and 100 mol% or less. Ethylene-based polymers (A0) have a density of 850-911 kg / m³. 3 Examples include ethylene-α-olefin copolymers.

[0040] When the ethylene-based polymer (A0) is an ethylene-α-olefin copolymer, examples of α-olefins constituting the ethylene-α-olefin copolymer include α-olefins having 3 to 20 carbon atoms. Specific examples of α-olefins having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-nonadecene, and 1-eicosene. Among these, α-olefins having 3 to 10 carbon atoms are preferred, α-olefins having 3 to 8 carbon atoms are more preferred, propylene, 1-butene, and 1-octene are even more preferred, and 1-butene is particularly preferred. The above α-olefins having 3 to 20 carbon atoms may be used individually or in combination of two or more types.

[0041] An ethylene-α-olefin copolymer comprises structural units derived from ethylene and structural units derived from α-olefins. Herein, in one preferred and exemplary embodiment of the present invention, the ethylene-α-olefin copolymer consists only of structural units derived from ethylene and structural units derived from α-olefins. However, the ethylene-α-olefin copolymer is not limited to such an embodiment, and for example, in addition to structural units derived from ethylene and structural units derived from α-olefins, it may contain one or more structural units derived from other polymerizable monomers that do not fall under either ethylene or α-olefins (hereinafter referred to as "other polymerizable monomers"), to the extent that it does not impair the purpose of this disclosure.

[0042] Other polymerizable monomers include, for example, vinyl compounds such as styrene, vinylcyclopentene, vinylcyclohexane, and vinylnorbornane; vinyl esters such as vinyl acetate; and unconjugated polyenes such as dicyclopentadiene, cyclohexadiene, 5-ethylidene-2-norbornene (ENB), and 5-vinyl-2-norbornene (VNB).

[0043] Specific examples of ethylene-α-olefin copolymers include ethylene-propylene copolymer, ethylene-propylene-1-butene copolymer, ethylene-propylene-ENB copolymer, ethylene-propylene-VNB copolymer, ethylene-propylene-ENB-VNB copolymer, ethylene-1-butene copolymer, ethylene-1-butene-ENB copolymer, ethylene-1-butene-VNB copolymer, ethylene-1-butene-ENB-VNB copolymer, ethylene-1-butene-1-octene copolymer, ethylene-4-methyl-1-pentene copolymer, ethylene-1-hexene copolymer, and ethylene-1-octene copolymer. Among these, ethylene-propylene copolymer and ethylene-1-butene copolymer are preferred.

[0044] The monomers constituting the ethylene-based polymer (A0) are ethylene, α-olefin, and the optional other polymerizable monomers mentioned above. These monomers may be, for example, monomers derived from fossil fuels or monomers derived from biomass, and these monomers may be used individually or in combination of two or more.

[0045] Here, the monomer derived from biomass is carbon 14 10 C isotopes -12 ~10 -14 While it contains a certain proportion, the corresponding monomers derived from fossil fuels are 14 Due to the radioactive decay of C 14 It is known that it does not contain carbon. Therefore, monomers derived from biomass and monomers derived from fossil fuels are different. 14They can be distinguished by whether or not they contain C isotopes. It is preferable from the viewpoint of reducing environmental impact that ethylene-based polymers (A0) contain constituent units derived from biomass-derived monomers.

[0046] Furthermore, the ethylene-based polymer (A0) may contain constituent units derived from chemically recycled monomers. Here, "chemically recycled" means obtained by depolymerizing, thermally decomposing, etc., polymers such as waste plastics, or by first converting polymers such as waste plastics into intermediates through depolymerization, thermal decomposition, etc., and then producing the polymer using these intermediates as raw materials. Chemically recycled monomers can be obtained by known methods. It is preferable for the ethylene-based polymer (A0) to contain constituent units derived from chemically recycled monomers from the viewpoint of reducing environmental impact (mainly waste reduction).

[0047] The ethylene-α-olefin copolymer preferably contains 51 to 95 mol% of structural unit (i) derived from ethylene and 5 to 49 mol% of structural unit (ii) derived from α-olefin (for example, α-olefin with 3 to 20 carbon atoms) (provided that the total content of structural unit (i) and structural unit (ii) is 100 mol%). The content of structural unit (i) is more preferably 60 to 93 mol%, more preferably 70 to 92 mol%, and even more preferably 75 to 90 mol%. In one preferred and exemplary embodiment of the present invention, the content of structural unit (i) is 75 to 87 mol%. On the other hand, the content of structural unit (ii) is more preferably 7 to 40 mol%, more preferably 8 to 30 mol%, and even more preferably 10 to 25 mol%. In one preferred and exemplary embodiment of the present invention, the content of structural unit (ii) is 13 to 25 mol%. The combination of the upper and lower limits for constituent unit (i) and constituent unit (ii) is arbitrary. When the ethylene-α-olefin copolymer contains two or more types of α-olefins (for example, α-olefins with 3 to 20 carbon atoms), their total amount shall be considered as the content of constituent unit (ii).

[0048] Method for producing acid-modified ethylene polymer (A) Acid-modified ethylene polymers (A) can be obtained by various known production methods, for example, by grafting the ethylene polymer (A0) with an unsaturated carboxylic acid and / or its derivatives in the presence of a radical initiator, but they can also be produced by, for example, the following method.

[0049] (1) A method of graft copolymerization by melting the ethylene polymer (A0) and adding an unsaturated carboxylic acid and / or its derivative.

[0050] (2) A method of graft copolymerization by dissolving the ethylene polymer (A0) in a solvent and adding an unsaturated carboxylic acid and / or its derivative.

[0051] In both of the above methods (1) and (2), the graft copolymerization is often carried out in the presence of a radical initiator.

[0052] In these methods, the amount of unsaturated carboxylic acid and / or its derivative used is usually 0.010 to 15 parts by mass, preferably 0.010 to 5.0 parts by mass, per 100 parts by mass of the ethylene polymer (A0). The amount of radical initiator used is usually 0.001 to 1.0 parts by mass, preferably 0.005 to 0.30 parts by mass, per 100 parts by mass of the ethylene polymer.

[0053] Examples of unsaturated carboxylic acids include maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, nadic acid (registered trademark for endocis-bicyclo[2,2,1]hept-5-ene-2,3-dicarboxylic acid), acrylic acid, and methacrylic acid.

[0054] Examples of derivatives of unsaturated carboxylic acids include acid anhydrides, imide compounds, amide compounds, and ester compounds of the aforementioned unsaturated carboxylic acids.

[0055] Examples of imide compounds of unsaturated carboxylic acids include maleimide. Examples of acid anhydrides of unsaturated carboxylic acids include maleic anhydride and citraconic anhydride. Examples of ester compounds of unsaturated carboxylic acids include monomethyl maleate and glycidyl malate.

[0056] Among unsaturated carboxylic acids and their derivatives, unsaturated carboxylic acids and their acid anhydrides are preferred, and maleic acid, nadic acid, and their acid anhydrides are particularly preferred. When using unsaturated carboxylic acids and / or their derivatives, they may be used individually or in combination of two or more.

[0057] The unsaturated carboxylic acids and their derivatives may be, for example, monomers derived from fossil fuels or monomers derived from biomass, and these monomers may be used individually or in combination of two or more.

[0058] Examples of the radical initiators that can be used include organic peroxides such as dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexine-3,2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, and 1,4-bis(tert-butylperoxyisopropyl)benzene. The radical initiator can be used directly mixed with the unsaturated carboxylic acid and / or its derivatives, the ethylene polymer (A0), and other components, but it can also be used after being dissolved in a small amount of organic solvent. The organic solvent is not particularly limited as long as it is capable of dissolving the radical initiator.

[0059] The reaction temperature in the grafting reaction is typically 70 to 280°C, preferably 80 to 260°C. The reaction time in the grafting reaction is typically 0.5 to 15 hours, preferably 1 to 10 hours.

[0060] Acid-modified ethylene polymer (A) can also be produced by reacting the unsaturated carboxylic acid and / or its derivative with the ethylene polymer (A0) in the presence of a radical initiator, without a solvent, using an extruder or the like. The solvent-free reaction is usually carried out at a temperature above the melting point of the ethylene polymer for 0.5 to 10 minutes.

[0061] Furthermore, if the resin composition contains two or more acid-modified ethylene polymers (A), these two or more acid-modified ethylene polymers (A) may be manufactured separately, or they may be manufactured by performing the graft reaction on a mixture of two or more ethylene polymers (A0).

[0062] <Polyamide (B)> The resin composition according to the present invention contains polyamide (B) (hereinafter also simply referred to as "component (B)"). The polyamide (B), which is the main component of the resin composition according to the present invention together with the acid-modified ethylene polymer (A) described above, is not particularly limited, and various conventionally known polyamide resins such as aliphatic polyamides, semi-aromatic polyamides, and aromatic polyamides can be used without limitation as long as they do not impair the effects of the present invention. As the polyamide (B), for example, an amino acid lactam or a melt-mold polyamide resin obtained by a polycondensation reaction of a diamine and a dicarboxylic acid can be used. Specific examples of the polyamide (B) include the following resins.

[0063] In a first aspect of the present invention, the polyamide (B) is a polycondensate of an organic dicarboxylic acid and an organic diamine. Examples of polycondensates of organic dicarboxylic acids and organic diamines include polycondensates of an organic dicarboxylic acid having 4 to 12 carbon atoms and an organic diamine having 2 to 13 carbon atoms, such as polyhexamethylene adipamide [polyamide 66], which is a polycondensate of hexamethylenediamine and adipic acid; polyhexamethylene azelamide [polyamide 69], which is a polycondensate of hexamethylenediamine and azelaic acid; polyhexamethylene sebakamid [polyamide 610], which is a polycondensate of hexamethylenediamine and sebaic acid; and hexamethylenediamine Examples include polyhexamethylene dodecanoamide [Polyamide 612], a polycondensate of amine and dodecanedionic acid; polydecamethylene sebakamid [Polyamide 1010], a polycondensate of decamethylenediamine and sebacic acid; semi-aromatic polyamides (Polyamide 6T, Polyamide 9T, Polyamide 10T, Polyamide 11T), which are polycondensates of aromatic dicarboxylic acids and aliphatic diamines; and polybis(4-aminocyclohexyl)methanedodecane, a polycondensate of bis-p-aminocyclohexylmethane and dodecanedionic acid.

[0064] Examples of the aforementioned organic dicarboxylic acids include adipic acid, pimelic acid, suberic acid, phthalic acid, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, phenylenedioxydiacetic acid, oxydibenzoic acid, diphenylmethanedicarboxylic acid, diphenylsulfondicarboxylic acid, biphenyldicarboxylic acid, sebacic acid, and dodecanediic acid. Examples of the aforementioned organic diamines include hexamethylenediamine, octamethylenediamine, nonanediamine, octanediamine, decanediamine, undecanediamine, and dodecanediamine.

[0065] Furthermore, in a second embodiment of the present invention, the polyamide (B) is a polycondensate of ω-amino acids. An example of a polycondensate of ω-amino acids is polyundecaneamide [polyamide 11], which is a polycondensate of ω-aminoundecanoic acid.

[0066] Furthermore, in a third aspect of the present invention, the polyamide (B) is a ring-opened polymer of a lactam. Examples of ring-opened polymers of lactams include polycapramid [polyamide 6], which is a ring-opened polymer of ε-aminocaprolactam, and polylauric lactam [polyamide 12], which is a ring-opened polymer of ε-aminolaurolactam.

[0067] The polyamide (B) may be modified with small amounts of triols and trivalent or higher polyhydroxy compounds or polycarboxylic acids, as long as it exhibits thermoplasticity.

[0068] The polyamide (B) may be an aliphatic polyamide or an aromatic polyamide. From the viewpoint of providing a resin composition with an excellent balance between rebound elasticity and compression set (CS), the polyamide (B) is preferably an aliphatic polyamide, more preferably one or more aliphatic polyamides selected from the group consisting of polyamide 6, polyamide 66, polyamide 612, polyamide 11 and polyamide 12, and even more preferably polyamide 6 and polyamide 11.

[0069] Furthermore, as the polyamide (B), for example, a polyamide resin produced from adipic acid, isophthalic acid, and hexamethylenediamine can be used, and blends containing two or more polyamide resins, such as a mixture of polyamide 6 and polyamide 66, can also be used.

[0070] The resin composition of the present invention may contain one type of polyamide (B) alone, or it may contain two or more types.

[0071] The raw materials for the polyamide (B) can be either fossil fuel-derived or biomass-derived. Alternatively, both fossil fuel-derived and biomass-derived raw materials may be used in combination.

[0072] <Composition and physical properties of resin compositions> The resin composition of the present invention comprises the above-mentioned acid-modified ethylene polymer (A) and the above-mentioned polyamide (B), wherein the content of the acid-modified ethylene polymer (A) is 60 to 95 parts by mass and the content of the polyamide (B) is 5 to 40 parts by mass per 100 parts by mass of the total of the acid-modified ethylene polymer (A) and the polyamide (B). The content of the acid-modified ethylene polymer (A) in the resin composition is preferably 62 to 94 parts by mass, more preferably 64 to 93 parts by mass, and even more preferably 66 to 92 parts by mass. On the other hand, the content of the polyamide (B) in the resin composition is preferably 6 to 38 parts by mass, more preferably 7 to 36 parts by mass, and even more preferably 8 to 34 parts by mass. The combination of the upper and lower limits of the acid-modified ethylene polymer (A) and polyamide (B) is arbitrary.

[0073] Here, if the resin composition of the present invention contains two or more types of acid-modified ethylene polymers (A), their total amount shall be considered as the content of acid-modified ethylene polymers (A). Furthermore, if the resin composition of the present invention contains two or more types of polyamides (B), their total amount shall be considered as the content of polyamides (B).

[0074] The resin composition of the present invention preferably has an A hardness of 60 or higher, measured according to ASTM D2240, and more preferably between 61 and 95. Here, an A hardness above a certain level is preferable because it provides excellent durability and mechanical properties for the resin composition. On the other hand, although there is no particular upper limit to the A hardness as long as the effects of the present invention are not impaired, from the viewpoint of balancing with rebound elasticity, it may be preferable for the A hardness to be below a certain level. In one preferred and exemplary embodiment of the present invention, the A hardness is within the range of 61 to 90.

[0075] The resin composition of the present invention may consist only of the acid-modified ethylene polymer (A) and the polyamide (B), or, in addition to the acid-modified ethylene polymer (A) and the polyamide (B), other components that do not fall under either the acid-modified ethylene polymer (A) or the polyamide (B) may be included as optional components, as necessary, to the extent that the objectives of the present invention are not impaired. Examples of such optional components include foaming agents, foaming aids, crosslinking agents, crosslinking aids, fillers, heat stabilizers, weather stabilizers, flame retardants, hydrochloric acid absorbers, pigments, and other polymers that do not fall under either the acid-modified ethylene polymer (A) or the polyamide (B) mentioned above. Furthermore, known additives that can be added to olefin resins can also be used as optional components.

[0076] If the resin composition of the present invention contains the above-mentioned optional components, each of the optional components contained in the resin composition of the present invention may be a single type or two or more types.

[0077] If the resin composition of the present invention contains the aforementioned optional components, the total amount of the aforementioned optional components in the resin composition of the present invention is, for example, 0.1 to 10 parts by mass per 100 parts by mass of the total amount of the acid-modified ethylene polymer (A) and the polyamide (B).

[0078] <Method for producing resin compositions> The resin composition of the present invention can be prepared by mixing the aforementioned components sequentially or simultaneously using known methods.

[0079] The resin composition of the present invention may have the form of a molded article, and it is also preferable to have the form of pellets, sheets, etc. That is, the present invention can be said to provide molded articles made of the resin composition of the present invention, for example, pellets made of the resin composition of the present invention, and sheets made of the resin composition of the present invention.

[0080] The pellets of the resin composition of the present invention can be produced by mixing components (A) and (B) described above, and any optional components used as needed, in the proportions described above using a Henschel mixer or the like, melting and plasticizing them at an appropriate temperature using a kneader such as a Banbury mixer, roll, or extruder, and then uniformly mixing and dispersing them before granulating them using a granulator. If the resin composition of the present invention contains a chemical blowing agent, it is desirable to melt and plasticize the mixture at a temperature that does not cause the chemical blowing agent to decompose.

[0081] Sheets of the resin composition of the present invention can be manufactured, for example, by forming pellets obtained as described above into sheets using an extruder or a calender. Alternatively, sheets of the resin composition can be manufactured by kneading each component of the resin composition of the present invention with a braver or the like, then forming them into sheets with a calender roll, forming them into sheets with a press molding machine, or kneading them with an extruder and then forming them into sheets by passing them through a T-die or annular die.

[0082] Furthermore, if the resin composition of the present invention contains a chemical blowing agent, it is preferable to perform sheet molding at a temperature below the decomposition temperature of the chemical blowing agent. Specifically, it is preferable to perform sheet molding by setting the temperature conditions to one in which the resin components are in a molten state.

[0083] The resin composition of the present invention can be used in various molding applications such as injection molding and foam molding, and is also suitably used in the production of foams.

[0084] [Molded body] The molded article of the present invention is a molded article made from the resin composition of the present invention. The molded article of the present invention may be a foamed article or a non-foamed article.

[0085] <Foam> In one preferred and exemplary embodiment of the present invention, the molded article of the present invention is a foam. That is, the present invention can also be said to provide a foam made from the resin composition of the present invention.

[0086] The foam according to the present invention is a foam obtained by foaming the resin composition of the present invention, which can be produced by foaming polymer components such as the acid-modified ethylene polymer (A) and the polyamide (B) described above. This foaming is usually carried out using a foaming agent.

[0087] The foam may be a non-crosslinked foam or a crosslinked foam, but the foam of the present invention is suitable for producing a non-crosslinked foam.

[0088] A foam containing the resin composition of the present invention is produced by expanding the resin composition of the present invention with gas. Here, typical methods for expanding the resin composition of the present invention include physical foaming and chemical foaming.

[0089] Physical foaming is a method of foaming a resin material, such as the resin composition of the present invention, by dissolving a gas or supercritical fluid in the resin material under high pressure, and then generating bubbles by reducing the solubility of the gas or supercritical fluid through pressure reduction or heating. Here, the gas or supercritical fluid used in physical foaming is called a physical foaming agent.

[0090] Examples of the aforementioned physical blowing agents include various aliphatic hydrocarbons such as methanol, ethanol, propane, butane, pentane, and hexane; various chlorinated hydrocarbons such as dichloroethane, dichloromethane, and carbon tetrachloride; various fluorinated chlorinated hydrocarbons such as fluorocarbons; and inorganic physical blowing agents such as air, carbon dioxide, nitrogen, argon, and water. Among these, carbon dioxide, nitrogen, and argon are superior because they do not need to be vaporized, are inexpensive, and have an extremely low risk of environmental pollution and ignition, with carbon dioxide being particularly superior.

[0091] The physical blowing agent can often be used in gaseous form. However, the physical blowing agent may also be used in supercritical fluid form to ensure sufficient solubility in polymer components such as the acid-modified ethylene polymer (A) and the polyamide (B). Carbon dioxide has a critical pressure of 7.38 MPa and a critical temperature of 31.1°C, making it relatively easy to convert into a supercritical fluid.

[0092] When a physical blowing agent is used as the blowing agent, there is no decomposition residue of the blowing agent in the resulting foam. Therefore, mold contamination during cross-linking foaming of the composition can be prevented. Moreover, since the physical blowing agent is not in powder form, it has excellent kneadability. Furthermore, using this physical blowing agent can prevent off-odors in the resulting foam (for example, ammonia odor generated during the decomposition of azodicarbonamide (ADCA)).

[0093] For storing physical blowing agents, in small-scale production, carbon dioxide, nitrogen, etc., can be used in cylinders and supplied to injection molding machines and extrusion molding machines through pressure reducing valves. Alternatively, the pressure may be increased using a pump and supplied to the injection molding machines and extrusion molding machines.

[0094] Furthermore, in facilities that manufacture foamed products on a large scale, storage tanks for liquefied carbon dioxide, liquefied nitrogen, etc., are installed, vaporized through a heat exchanger, and supplied to injection molding machines, extrusion molding machines, etc., via piping and pressure reducing valves.

[0095] Furthermore, when using a liquid physical blowing agent, the storage pressure is preferably in the range of 0.13 to 100 MPa. Furthermore, when using a physical blowing agent, the amount of the physical blowing agent added is determined appropriately according to the desired foaming ratio.

[0096] On the other hand, chemical foaming is a method of foaming a plastic by blending a chemical substance that generates gas through a chemical reaction with a resin material such as the resin composition of the present invention, and generating bubbles with the gas generated by the chemical reaction of the chemical substance. Here, the chemical substance used in chemical foaming is called a chemical foaming agent. This chemical foaming agent is a chemical substance that generates gas through thermal decomposition or other chemical reactions, and examples include organic chemical foaming agents such as azodicarbonamide (ADCA) and inorganic chemical foaming agents such as sodium bicarbonate. When using a chemical blowing agent, foam can be easily manufactured using a general-purpose molding machine.

[0097] <Non-foamed molded body> The molded article of the present invention may be a non-foamed molded article. Examples of non-foamed molded articles include molded articles obtained by molding the resin composition of the present invention described above using known molding methods such as injection molding, extrusion molding, inflation molding, blow molding, extrusion blow molding, injection blow molding, press molding, vacuum molding, and calendering. Among these, blow molding, extrusion blow molding, and injection blow molding are preferred, and examples of suitable molded articles include blow-molded articles of various shapes and bottles.

[0098] <Laminate> The resin composition of the present invention may have the form of a laminate. In other words, the present invention can also be said to provide a laminate containing a layer made of the resin composition of the present invention.

[0099] Here, the layer made of the resin composition of the present invention may be a layer made of the foam, or a layer made of the non-foamed molded article. In one preferred and exemplary embodiment of the present invention, the layer made of the resin composition of the present invention is a layer made of the foam.

[0100] In one preferred and exemplary embodiment of the present invention, the laminate according to the present invention is a laminate having a layer made of the foam, and usually has a layer made of the foam and a layer made of another material. Here, the layer made of the other material is preferably a layer made of at least one material selected from the group consisting of polyolefin, polyurethane, rubber, leather and artificial leather.

[0101] The aforementioned polyolefins, polyurethanes, rubbers, leathers, and artificial leathers are not particularly limited, and conventionally known polyolefins, polyurethanes, rubbers, leathers, and artificial leathers can be used. Such laminates are particularly suitable for use in footwear and footwear components.

[0102] [Applications of resin compositions, foams, and laminates] The resin composition of the present invention is suitable for the production of various molded articles and foams, and is particularly suitable for the production of non-crosslinked molded articles and non-crosslinked foams, and can be used without limitation for conventionally known applications.

[0103] Specific examples of applications for the resin composition of the present invention and molded articles, foams, and laminates using the resin composition include: automotive interior and exterior parts such as automotive interior surface materials, weatherstrip sponges, body panels, steering wheels, and side shields; civil engineering and building materials such as ground improvement sheets, water slabs, and noise-blocking walls; industrial parts; footwear parts such as shoe soles and sandals; electrical and electronic components such as wire insulation materials, connectors, and cap plugs; sports and leisure goods such as golf club grips, baseball bat grips, swimming fins, and goggles; and miscellaneous goods such as gaskets, waterproof cloths, garden hoses, belts, drainage sheets, and cosmetic puffs. In particular, it can be suitably used as footwear parts such as shoe soles, shoe insoles, half insoles, midsoles, inner soles, and outsoles.

[0104] <Footwear and footwear components> Particularly suitable applications of the resin composition of the present invention include footwear and footwear components. In other words, the footwear and footwear components according to the present invention include the molded articles.

[0105] In one preferred and exemplary embodiment of the present invention, the footwear and footwear components according to the present invention include the foam or laminate. In this embodiment, because the footwear and footwear components include the foam or laminate, they are lightweight and can be deformed by prolonged use.

[0106] Examples of the aforementioned footwear include shoes and sandals. A suitable example of the aforementioned footwear is sports shoes. Examples of such sports shoes include track and field shoes, marathon shoes, basketball shoes, tennis shoes, golf shoes, walking shoes, marine shoes, trekking shoes, and running shoes. Among these, running shoes are preferred.

[0107] Examples of the aforementioned footwear components include soles, insoles, half insoles, midsoles, inner soles, and outsoles. Furthermore, preferred examples of the footwear components include the components of the aforementioned sports shoes, with insoles, half insoles, midsoles, inner soles, and outsoles for running shoes being more preferred. [Examples]

[0108] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[0109] [Raw materials used] The materials used in the examples and comparative examples are as follows:

[0110] <Measurement conditions for acid-modified ethylene polymers> • MFR: Measured in accordance with ASTM D1238 under conditions of 190℃ and 2.16kg. • Density: Measured in accordance with ASTM D1505. • Ethylene content: Measured using an NMR analyzer as follows: 0.35 g of the sample was heated and dissolved in 2.0 ml of hexachlorobutadiene. After filtering this solution through a glass filter (G2), 0.5 ml of deuterated benzene was added and the solution was placed in a 10 mm inner diameter NMR tube and analyzed at 120°C. 13 Perform 1C-NMR measurements. The number of cumulative measurements should be 10,000 or more. 13 The ethylene content was quantified using 1C-NMR spectroscopy. • Amount of maleic anhydride graft: Wavenumber 1780 cm², attributed to the carbonyl group in FT-IR. -1 Based on peak intensity, the amount of maleic acid contained in the polymer was determined from a separately prepared calibration curve. Next, approximately 1 g of the sample (acid-modified polyolefin) was extracted with a xylene / water mixed solvent, and after removing the polymer from the extract, maleic acid was separated using liquid chromatography with a reversed-phase column, and the amount of residual maleic acid in the polymer was determined from a separately prepared calibration curve. The amount of maleic anhydride graft was calculated by subtracting the amount of residual maleic acid from the amount of maleic acid in the polymer.

[0111] <Materials used> <<Acid-modified ethylene polymer (A)>> • Acid-modified ethylene polymer (A-1): Maleic anhydride modified product of ethylene·1-butene random copolymer, MFR (190℃, 2.16kg, ASTM D1238) 1.1g / 10min, density (ASTM D1505) 865kg / m³ 3 Ethylene content 80 mol%, maleic anhydride graft amount 0.5% by mass • Acid-modified ethylene polymer (A-2): Maleic anhydride modified product of ethylene-1-butene random copolymer, MFR (190℃, 2.16kg, ASTM D1238) 0.6g / 10min, density (ASTM D1505) 866kg / m³ 3 Ethylene content 80 mol%, maleic anhydride graft amount 1.0% by mass • Acid-modified ethylene polymer (A-3): Maleic anhydride modified ethylene-1-butene random copolymer, MFR (190℃, 2.16kg, ASTM D1238) 0.5g / 10min, density (ASTM D1505) 870kg / m³ 3 Ethylene content 80 mol%, maleic anhydride graft amount 2.0% by mass • Acid-modified ethylene polymer (A-4): Maleic anhydride modified product of ethylene-1-butene random copolymer, MFR (190℃, 2.16kg, ASTM D1238) 1.8g / 10min, density (ASTM D1505) 863kg / m³ 3 Ethylene content 80 mol%, maleic anhydride graft amount 0.33% by mass • Acid-modified ethylene polymer (A-5): Maleic anhydride modified product of ethylene-1-butene random copolymer, MFR (190℃, 2.16kg, ASTM D1238) 1.2g / 10min, density (ASTM D1505) 865kg / m³ 3 Ethylene content 80 mol%, maleic anhydride graft amount 0.85% by mass • Acid-modified ethylene polymer (A-6): Maleic anhydride modified product of ethylene-1-butene random copolymer, MFR (190℃, 2.16kg, ASTM D1238) 3.5g / 10min, density (ASTM D1505) 865kg / m³ 3 Ethylene content 80 mol%, maleic anhydride graft amount 0.45 mass% • Acid-modified ethylene polymer (A-7): Maleic anhydride modified product of ethylene-1-butene random copolymer, MFR (190℃, 2.16kg, ASTM D1238) 2.5g / 10min, density (ASTM D1505) 866kg / m³ 3 Ethylene content 80 mol%, maleic anhydride graft amount 0.79% by mass • Acid-modified ethylene polymer (A-8): Maleic anhydride modified product of ethylene-1-butene random copolymer, MFR (190℃, 2.16kg, ASTM D1238) 3.3g / 10min, density (ASTM D1505) 871kg / m³ 3 Ethylene content 85 mol%, maleic anhydride graft amount 0.46% by mass • Acid-modified ethylene polymer (A-9): Maleic anhydride modified product of ethylene-1-butene random copolymer, MFR (190℃, 2.16kg, ASTM D1238) 2.2g / 10min, density (ASTM D1505) 873kg / m³ 3 Ethylene content 85 mol%, maleic anhydride graft amount 0.93% by mass • Acid-modified ethylene polymer (A-10): Maleic anhydride modified product of ethylene-1-butene random copolymer, MFR (190℃, 2.16kg, ASTM D1238) 1.5g / 10min, density (ASTM D1505) 890kg / m³ 3 Ethylene content 89 mol%, maleic anhydride graft amount 0.82% by mass

[0112] <<Polyamide (B)>> • Polyamide 6 (B-1): Manufactured by Toray Industries, Ltd., Amilan (registered trademark) CM1007 • Polyamide 11 (B-2): Manufactured by Arkema, Rilsan® BMNO

[0113] <<Unmodified ethylene polymer (C)>> • Ethylene-1-butene random copolymer (C-1): MFR (190℃, 2.16kg, ASTM D1238) 3.6g / 10min, Density (ASTM D1505) 864kg / m³ 3 ethylene content 80 mol%

[0114] <<Acid-containing ethylene polymer (D)>> • Acid-containing ethylene polymer (D-1) The acid-containing ethylene polymer (D-1) was obtained by mixing 100 parts by mass of the ethylene-1-butene random copolymer (C-1) and 0.6 parts by mass of maleic anhydride in an extruder TEX30 (manufactured by Japan Steel Works, Ltd.) under the conditions of a cylinder temperature of 250°C, a discharge rate of 7 kg / hr, and a screw rotation speed of 150 rpm. When the present inventors measured the maleic anhydride graft amount of this acid-containing ethylene-based polymer (D-1) by the method described in the above "maleic anhydride graft amount", the maleic anhydride graft amount in the acid-containing ethylene-based polymer (D-1) was 0.14% by mass.

[0115] [Example 1] [Manufacture of Resin Composition] Into an extruder TEX25 (manufactured by Japan Steel Works, Ltd.), 70 parts by mass of an acid-modified ethylene-based polymer (A-1) and 30 parts by mass of a polyamide (B-1) were charged, and they were mixed under the conditions of a cylinder temperature of 245°C, a discharge rate of 15 kg / hr, and a screw rotation speed of 180 rpm to obtain a resin composition.

[0116] [Evaluation] Using a hydraulic hot press machine set at 240°C, the above resin composition was heated for 4 minutes, then molded under a pressure of 10 MPa for 5 minutes, and then cooled under a pressure of 20°C and 10 MPa for 4 minutes to produce a 2-mm-thick evaluation sheet. Using this sheet, the A hardness, rebound resilience (%), and compression set (CS) were measured by the following evaluation methods. The results are shown in Table 1-1.

[0117] [[A Hardness]] For the 2-mm-thick evaluation sheet obtained above, the A hardness (Shore A hardness) was measured by using an A-type measuring instrument and reading the scale immediately after the indenter contacted the sheet (in accordance with ASTM D2240).

[0118] [[Rebound Resilience]] Seven sheets of the 2-mm-thick evaluation sheet obtained above were stacked, and the rebound resilience was measured by a pendulum-type test (Lupke type) (in accordance with JIS K6255).

[0119] [[Compression Set (CS)]] The 2-mm-thick evaluation sheet obtained above was cut out into φ30 mm and six sheets were stacked, and they were held at 50°C / 24 h in a 25% compressed state. After releasing the pressure, the sample thickness after 30 minutes was measured, and the compression set (CS) was calculated from the following formula (in accordance with JIS K6262). CS = (t0 - t1) / (t0 - t2) × 100 t0: Thickness of the sample used for measurement (mm) t1: Thickness of the sample (mm) 30 minutes after removing the sample from the compression device. t2: Thickness when compressed (mm)

[0120] [Example 2] A resin composition and evaluation sheet were prepared in the same manner as in Example 1, except that (A-2) was used as the acid-modified ethylene polymer in an amount of 90 parts by mass, and the amount of polyamide (B-1) added was 10 parts by mass. The results are shown in Table 1-1.

[0121] [Example 3] Resin compositions and evaluation sheets were prepared and evaluated in the same manner as in Example 1, except that (A-2) was used as the acid-modified ethylene polymer. The results are shown in Table 1-1.

[0122] [Example 4] A resin composition and evaluation sheet were prepared in the same manner as in Example 1, except that (A-3) was used as the acid-modified ethylene polymer in an amount of 90 parts by mass, and the amount of polyamide (B-1) added was 10 parts by mass. The results are shown in Table 1-1.

[0123] [Example 5] Resin compositions and evaluation sheets were prepared and evaluated in the same manner as in Example 1, except that (A-3) was used as the acid-modified ethylene polymer. The results are shown in Table 1-1.

[0124] [Example 6] Resin compositions and evaluation sheets were prepared and evaluated in the same manner as in Example 1, except that (A-4) was used as the acid-modified ethylene polymer. The results are shown in Table 1-1.

[0125] [Example 7] Resin compositions and evaluation sheets were prepared and evaluated in the same manner as in Example 1, except that (A-5) was used as the acid-modified ethylene polymer. The results are shown in Table 1-1.

[0126] [Example 8] Resin compositions and evaluation sheets were prepared and evaluated in the same manner as in Example 1, except that (A-6) was used as the acid-modified ethylene polymer. The results are shown in Table 1-1.

[0127] [Example 9] Resin compositions and evaluation sheets were prepared and evaluated in the same manner as in Example 1, except that (A-7) was used as the acid-modified ethylene polymer. The results are shown in Table 1-1.

[0128] [Example 10] A resin composition and evaluation sheet were prepared in the same manner as in Example 1, except that (A-8) was used as the acid-modified ethylene polymer in an amount of 90 parts by mass, and the amount of polyamide (B-1) added was 10 parts by mass. The results are shown in Table 1-2.

[0129] [Example 11] Resin compositions and evaluation sheets were prepared and evaluated in the same manner as in Example 1, except that (A-8) was used as the acid-modified ethylene polymer. The results are shown in Table 1-2.

[0130] [Example 12] A resin composition and evaluation sheet were prepared in the same manner as in Example 1, except that (A-9) was used as the acid-modified ethylene polymer in an amount of 90 parts by mass, and the amount of polyamide (B-1) added was 10 parts by mass. The results are shown in Table 1-2.

[0131] [Example 13] Resin compositions and evaluation sheets were prepared and evaluated in the same manner as in Example 1, except that (A-9) was used as the acid-modified ethylene polymer. The results are shown in Table 1-2.

[0132] [Example 14] A resin composition and evaluation sheet were prepared in the same manner as in Example 1, except that the amount of acid-modified ethylene polymer (A-1) added was 90 parts by mass, and polyamide (B-2) was used in an amount of 10 parts by mass. The results are shown in Table 1-2.

[0133] [Example 15] A resin composition and evaluation sheet were prepared and evaluated in the same manner as in Example 1, except that (B-2) was used as the polyamide. The results are shown in Table 1-2.

[0134] [Example 16] A resin composition and evaluation sheet were prepared in the same manner as in Example 1, except that (A-2) was used as the acid-modified ethylene polymer in an amount of 90 parts by mass, and (B-2) was used as the polyamide in an amount of 10 parts by mass. The results are shown in Table 1-2.

[0135] [Example 17] Resin compositions and evaluation sheets were prepared in the same manner as in Example 1, except that (A-2) was used as the acid-modified ethylene polymer and (B-2) as the polyamide, and the evaluation was performed. The results are shown in Table 1-2.

[0136] [Example 18] Resin compositions and evaluation sheets were prepared in the same manner as in Example 1, except that (A-6) was used as the acid-modified ethylene polymer and (B-2) was used as the polyamide, and the evaluation was performed. The results are shown in Table 1-2.

[0137] [Comparative Example 1] An evaluation sheet was prepared using only 100 parts by mass of acid-modified ethylene polymer (A-1) in the same manner as in Example 1, and the evaluation was performed. The results are shown in Table 2-1.

[0138] [Comparative Example 2] An evaluation sheet was prepared using only 100 parts by mass of acid-modified ethylene polymer (A-2) in the same manner as in Example 1, and the evaluation was performed. The results are shown in Table 2-1.

[0139] [Comparative Example 3] An evaluation sheet was prepared using only 100 parts by mass of acid-modified ethylene polymer (A-3) in the same manner as in Example 1, and the evaluation was performed. The results are shown in Table 2-1.

[0140] [Comparative Example 4] An evaluation sheet was prepared using only 100 parts by mass of acid-modified ethylene polymer (A-4) in the same manner as in Example 1, and the evaluation was performed. The results are shown in Table 2-1.

[0141] [Comparative Example 5] An evaluation sheet was prepared using only 100 parts by mass of acid-modified ethylene polymer (A-5) in the same manner as in Example 1, and the evaluation was performed. The results are shown in Table 2-1.

[0142] [Comparative Example 6] An evaluation sheet was prepared using only 100 parts by mass of acid-modified ethylene polymer (A-6) in the same manner as in Example 1, and the evaluation was performed. The results are shown in Table 2-1.

[0143] [Comparative Example 7] A resin composition and evaluation sheet were prepared in the same manner as in Example 1, except that (A-6) was used as the acid-modified ethylene polymer in an amount of 35 parts by mass, and (B-2) was used as the polyamide in an amount of 65 parts by mass. The results are shown in Table 2-1.

[0144] [Comparative Example 8] An evaluation sheet was prepared using only 100 parts by mass of acid-modified ethylene polymer (A-7) in the same manner as in Example 1, and the evaluation was performed. The results are shown in Table 2-1.

[0145] [Comparative Example 9] An evaluation sheet was prepared using only 100 parts by mass of acid-modified ethylene polymer (A-8) in the same manner as in Example 1, and the evaluation was performed. The results are shown in Table 2-1.

[0146] [Comparative Example 10] An evaluation sheet was prepared using only 100 parts by mass of acid-modified ethylene polymer (A-9) in the same manner as in Example 1, and the evaluation was performed. The results are shown in Table 2-2.

[0147] [Comparative Example 11] An evaluation sheet was prepared using only 100 parts by mass of acid-modified ethylene polymer (A-10) in the same manner as in Example 1, and the evaluation was performed. The results are shown in Table 2-2.

[0148] [Comparative Example 12] A resin composition and evaluation sheet were prepared in the same manner as in Example 1, except that (A-10) was used as the acid-modified ethylene polymer in an amount of 90 parts by mass, and the amount of polyamide (B-1) added was 10 parts by mass. The results are shown in Table 2-2.

[0149] [Comparative Example 13] Resin compositions and evaluation sheets were prepared and evaluated in the same manner as in Example 1, except that (A-10) was used as the acid-modified ethylene polymer. The results are shown in Table 2-2.

[0150] [Comparative Example 14] A resin composition and evaluation sheet were prepared in the same manner as in Example 1, except that an unmodified ethylene polymer (C-1) was used instead of an acid-modified ethylene polymer (A-1) at an amount of 90 parts by mass, and polyamide (B-2) was used at an amount of 10 parts by mass. The results are shown in Table 2-2.

[0151] [Comparative Example 15] Resin compositions and evaluation sheets were prepared in the same manner as in Example 1, except that an unmodified ethylene polymer (C-1) was used instead of an acid-modified ethylene polymer (A-1), and (B-2) was used as the polyamide. The results are shown in Table 2-2.

[0152] [Comparative Example 16] Resin compositions and evaluation sheets were prepared and evaluated in the same manner as in Example 1, except that an acid-containing ethylene polymer (D-1) was used instead of an acid-modified ethylene polymer (A-1), and (B-2) was used as the polyamide. The results are shown in Table 2-2.

[0153] Table 1-1

[0154] Table 1-2

[0155] Table 2-1

[0156] Table 2-2

Claims

1. It comprises an acid-modified ethylene polymer (A) and a polyamide (B), With respect to 100 parts by mass of the total of the acid-modified ethylene polymer (A) and the polyamide (B), the content of the acid-modified ethylene polymer (A) is 60 to 95 parts by mass, and the content of the polyamide (B) is 5 to 40 parts by mass. The density of the acid-modified ethylene polymer (A) measured at 25°C in accordance with ASTM D1505 is 850–885 kg / m³. ３ A resin composition within the range of [specified range].

2. The resin composition according to claim 1, wherein the A hardness of the resin composition measured in accordance with ASTM D2240 is 60 or higher.

3. The resin composition according to claim 1, wherein the acid-modified ethylene polymer (A) has a melt flow rate in the range of 0.05 to 100 g / 10 min, measured under conditions of 190°C and a 2.16 kg load in accordance with ASTM D1238.

4. The resin composition according to claim 1, wherein the acid modification amount of the acid-modified ethylene polymer (A) is in the range of 0.2 to 5.0% by mass.

5. The resin composition according to claim 1, wherein the polyamide (B) is at least one polyamide selected from the group consisting of polyamide 6, polyamide 66, polyamide 612, polyamide 11, and polyamide 12.

6. A foam comprising the resin composition according to any one of claims 1 to 5.

7. Footwear containing the foam material described in claim 6.

8. A footwear component comprising the foam described in claim 6.

9. The footwear component according to claim 8, wherein the footwear component is a sole, an insole, a half insole, a midsole, an inner sole, or an outsole.

10. A layer made of the foam described in claim 6, A layer made of at least one material selected from the group consisting of polyolefin, polyurethane, rubber, leather, and artificial leather. A laminate having the following characteristics.

11. Footwear comprising the laminate according to claim 10.

12. A footwear component comprising the laminate described in claim 10.

13. The footwear component according to claim 12, wherein the footwear component is a sole, shoe insole, half insole, midsole, inner sole, or outsole.

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