Thermoplastic resin composition and molded article

Abstract

The present invention addresses the problem of providing: a thermoplastic resin composition which exhibits anti-fouling performance and exhibits good anti-bacterial activity against Staphylococcus aureus and Escherichia coli; and a molded body.　This thermoplastic resin composition contains: 5-95 parts by mass of a propylene resin (A); 5-95 parts by mass of at least one type selected from the group consisting of a copolymer (B') which contains a monomer unit derived from an aromatic vinyl compound and a monomer unit derived from a conjugated diene compound, and an ethylene-based copolymer rubber (B); and a glycerin fatty acid ester (C). Component (C) is an ester of a fatty acid having 8-14 carbon atoms.

Description

[Technical Field]

[0001] The present invention relates to a thermoplastic resin composition and a molded article. [Background technology]

[0002] Conventionally, molded articles such as films and sheets formed using resin compositions having antibacterial activity have been known. For example, Patent Document 1 discloses a polyolefin film containing a glycerin fatty acid ester as a film having antibacterial activity against fungi of mushrooms. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-176384 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the film containing the resin composition of Patent Document 1 has a problem in that it does not have sufficient antifouling properties and requires a lot of effort to treat after it becomes soiled.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to provide a thermoplastic resin composition and a molded article thereof that have antifouling properties and good antibacterial activity against Staphylococcus aureus and Escherichia coli. [Means for solving the problem]

[0006] The present invention relates to the following: [1] 5 to 95 parts by mass of a propylene resin (A), 5 to 95 parts by mass of at least one selected from the group consisting of an ethylene copolymer rubber (B) and a copolymer (B') containing a monomer unit derived from an aromatic vinyl compound and a monomer unit derived from a conjugated diene compound (where the total amount of the propylene resin (A), the ethylene copolymer rubber (B), and the copolymer (B') is taken as 100 parts by mass); Glycerin fatty acid ester (C), A thermoplastic resin composition, wherein (C) is an ester of a fatty acid having 8 to 14 carbon atoms. [2] The propylene resin (A) is at least one selected from the group consisting of a propylene homopolymer, a heterophasic polymer material, and a propylene random copolymer; The content of the propylene resin (A) is A parts by mass, the content of the ethylene copolymer rubber (B) is B parts by mass, the content of the copolymer (B') is B' parts by mass, the content of the propylene homopolymer is A1 parts by mass, the content of the heterophasic polymerization material is A2 parts by mass, and A+B+B' is 100 parts by mass, The thermoplastic resin composition according to [1], wherein (B+B') / (A1+A2+B+B') is 0.51 to 1.0. [3] The thermoplastic resin composition according to [1] or [2], further comprising a mineral oil (D). [4] The thermoplastic resin composition according to [3], wherein the content of (D) is 0.1% by mass or more and 60% by mass or less, where the total amount of the propylene resin (A), the ethylene copolymer rubber (B), the copolymer (B'), and the mineral oil (D) is 100% by mass. [5] The thermoplastic resin composition according to any one of [1] to [4], further comprising an antioxidant (G). [6] The thermoplastic resin composition according to any one of [1] to [5], further comprising a crosslinking agent (E). [7] The thermoplastic resin composition according to any one of [1] to [6], further comprising a lubricant (F). [8] The thermoplastic resin composition according to [7], wherein (F) is a fatty acid amide. [9] The thermoplastic resin composition according to any one of [1] to [8], wherein the content of (C) is 0.1% by mass or more and 10% by mass or less, relative to 100% by mass of the total amount of the propylene resin (A), the ethylene copolymer rubber (B), the copolymer (B'), and the mineral oil (D).

[10] The thermoplastic resin composition according to any one of [1] to [9], wherein (C) is a diglycerin fatty acid ester.

[11] The thermoplastic resin composition according to

[10] , wherein (C) is a diglycerin mono-fatty acid ester.

[12] A molded article comprising the thermoplastic resin composition according to any one of [1] to

[11] . [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a thermoplastic resin composition and a molded article thereof which have antifouling properties and good antibacterial activity against Staphylococcus aureus and Escherichia coli. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments.

[0009] [Thermoplastic resin composition] The thermoplastic resin composition according to the present embodiment contains at least one selected from the group consisting of a propylene resin (A) (hereinafter sometimes simply referred to as (A)), an ethylene copolymer rubber (B) (hereinafter sometimes simply referred to as (B)), and a copolymer (B') (hereinafter sometimes simply referred to as (B')) containing a monomer unit derived from an aromatic vinyl compound and a monomer unit derived from a conjugated diene compound, and a glycerin fatty acid ester (C) (hereinafter sometimes simply referred to as (C)). The thermoplastic resin composition according to the present embodiment may further contain a mineral oil (D) (hereinafter sometimes simply referred to as (D)), a crosslinking agent (E) (hereinafter sometimes simply referred to as (E)), and a lubricant (F) (hereinafter sometimes simply referred to as (F)).

[0010] <Propylene resin (A)> Examples of the propylene resin (A) include propylene homopolymers, heterophasic polymer materials, and propylene random copolymers. The propylene resin (A) is preferably at least one selected from the group consisting of propylene homopolymers, heterophasic polymer materials, and propylene random copolymers, and more preferably a propylene homopolymer, heterophasic polymer material, or propylene random copolymer. (A) may be used alone or in combination of two or more. The content of propylene-derived monomer units in (A) is more than 50% by mass and not more than 100% by mass, based on 100% by mass of the total amount of (A). That is, the content of ethylene-derived monomer units in (A) is less than 50% by mass, based on 100% by mass of the total amount of (A).

[0011] Examples of propylene random copolymers include: (1) A propylene-ethylene random copolymer in which the content of monomer units derived from propylene is 90% by mass or more and 99.5% by mass or less, and the content of monomer units derived from ethylene is 0.5% by mass or more and 10% by mass or less, relative to 100% by mass of the total amount of monomer units derived from propylene and monomer units derived from ethylene; (2) A propylene-ethylene-α-olefin random copolymer in which the content of monomer units derived from propylene is 81% by mass or more and 99% by mass or less, the content of monomer units derived from ethylene is 0.5% by mass or more and 9.5% by mass or less, and the content of monomer units derived from α-olefins having 4 to 10 carbon atoms is 0.5% by mass or more and 9.5% by mass or less, relative to 100% by mass of the total amount of monomer units derived from propylene, monomer units derived from ethylene, and monomer units derived from α-olefins having 4 to 10 carbon atoms; or (3) A propylene-α-olefin random copolymer in which the content of monomer units derived from propylene is 90% by mass or more and 99.5% by mass or less, and the content of monomer units derived from α-olefins having 4 to 10 carbon atoms is 0.5% by mass or more and 10% by mass or less, relative to 100% by mass of the total amount of monomer units derived from propylene and monomer units derived from α-olefins having 4 to 10 carbon atoms.

[0012] Examples of the α-olefins having 4 to 10 carbon atoms in (1) and (2) above include linear α-olefins such as 1-butene, 1-pentene, 1-hexene, 1-octene, and 1-decene; and branched α-olefins such as 3-methyl-1-butene and 3-methyl-1-pentene. The α-olefins having 4 to 10 carbon atoms may be used alone or in combination of two or more.

[0013] Examples of methods for producing propylene homopolymers and propylene random copolymers include slurry polymerization, solution polymerization, bulk polymerization, and gas phase polymerization using known complex catalysts such as Ziegler-Natta catalysts, metallocene complexes, and non-metallocene complexes.

[0014] The heterophasic polymeric material is a polymeric material comprising a propylene homopolymer component (I) and an ethylene copolymer component (II) having monomer units derived from at least one selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms and monomer units derived from ethylene. The content of the propylene homopolymer component (I) in the heterophasic polymeric material is preferably 70% to 90% by mass, and the content of the ethylene copolymer component (II) in the heterophasic polymeric material is preferably 10% to 30% by mass, based on 100% by mass of the total heterophasic polymeric material. The content of the propylene homopolymer component (I) in the heterophasic polymeric material is more preferably 75% to 90% by mass, and the content of the ethylene copolymer component (II) in the heterophasic polymeric material is more preferably 10% to 25% by mass, based on 100% by mass of the total heterophasic polymeric material.

[0015] The α-olefin having 4 or more carbon atoms in the ethylene copolymer component (II) is preferably an α-olefin having 4 to 20 carbon atoms. Examples of α-olefins having 4 to 20 carbon atoms include 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, 3-methyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene, 2-ethyl-1-hexene, and 2,2,4-trimethyl-1-pentene. The α-olefin having 4 or more carbon atoms is more preferably an α-olefin having 4 to 10 carbon atoms, and even more preferably 1-butene, 1-hexene, or 1-octene. The α-olefin having 4 or more carbon atoms may be used alone or in combination of two or more.

[0016] The content of monomer units derived from ethylene in the ethylene copolymer component (II) is preferably from 22 to 90% by mass, more preferably from 25 to 80% by mass, and even more preferably from 27 to 70% by mass, based on 100% by mass of the total amount of monomer units derived from ethylene and at least one selected from the group consisting of propylene and an α-olefin having 4 or more carbon atoms. The content of monomer units derived from at least one selected from the group consisting of propylene and an α-olefin having 4 or more carbon atoms in the ethylene copolymer component (II) is preferably from 20 to 78% by mass, more preferably from 30 to 75% by mass, and even more preferably from 40 to 73% by mass, based on 100% by mass of the total amount of monomer units derived from ethylene and at least one selected from the group consisting of propylene and an α-olefin having 4 or more carbon atoms. The content of the ethylene-derived monomer units and the content of the at least one monomer unit selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms in the ethylene copolymer component (II) can be determined, for example, by infrared spectroscopy. Specifically, the infrared absorption spectrum of the ethylene copolymer component (II) is measured using an infrared spectrophotometer, and the content of the ethylene-derived units and the content of the at least one monomer unit selected from the group consisting of propylene and α-olefins having 4 or more carbon atoms are calculated according to the method described in "Characterization of Polyethylene by Infrared Absorption Spectroscopy (Takayama, Usami et al.)" or "Die Makromolekulare Chemie, 177, 461 (1976) (McRae, MA, Madam S, WF et al.)."

[0017] Examples of the ethylene copolymer component (II) include a propylene-ethylene copolymer, an ethylene-1-butene copolymer, an ethylene-1-hexene copolymer, an ethylene-1-octene copolymer, a propylene-ethylene-1-butene copolymer, a propylene-ethylene-1-hexene copolymer, and a propylene-ethylene-1-octene copolymer, and the propylene-ethylene copolymer or the propylene-ethylene-1-butene copolymer is preferred. The ethylene copolymer component (II) may be a random copolymer or a block copolymer.

[0018] Examples of methods for producing heterophasic polymerized materials include multi-stage polymerization using a polymerization catalyst.

[0019] Examples of polymerization catalysts used in the production of heterophasic polymerization materials include Ziegler catalysts, Ziegler-Natta catalysts, catalysts consisting of a transition metal compound of Group 4 of the periodic table having a cyclopentadienyl ring and an alkylaluminoxane, catalysts consisting of a transition metal compound of Group 4 of the periodic table having a cyclopentadienyl ring, a compound that reacts with the transition metal compound to form an ionic complex, and an organoaluminum compound.

[0020] In addition, a prepolymerization catalyst may be used in the presence of the polymerization catalyst. Examples of the prepolymerization catalyst include the catalysts described in JP-A Nos. 61-218606, 61-287904, 5-194685, 7-216017, 9-316147, 10-212319, and 2004-182981.

[0021] Polymerization methods for producing heterophasic polymeric materials include, for example, bulk polymerization, solution polymerization, slurry polymerization, and gas-phase polymerization. Examples of inert hydrocarbon solvents used in solution polymerization and slurry polymerization include propane, butane, isobutane, pentane, hexane, heptane, and octane. Two or more of these polymerization methods may be combined, and may be either batch or continuous. Preferred polymerization methods for producing heterophasic polymeric materials are continuous gas-phase polymerization or bulk-gas-phase polymerization, in which bulk polymerization and gas-phase polymerization are carried out continuously.

[0022] In order to reduce the compression set of the thermoplastic resin composition, the melt flow rate (MFR) of (A), measured according to JIS K7210 at a temperature of 230°C and a load of 21.18 N, is preferably 60 g / 10 min or less, more preferably 30 g / 10 min or less, and even more preferably 10 g / 10 min or less. The MFR of (A) is preferably 0.05 g / 10 min or more, and more preferably 0.1 g / 10 min or more. The MFR of (A) is preferably 0.05 g / 10 min or more to 60 g / 10 min or less, more preferably 0.1 g / 10 min or more to 30 g / 10 min or less, and even more preferably 0.1 g / 10 min or more to 10 g / 10 min or less.

[0023] When two or more (A) are combined, the MFR of the propylene polymer with the highest content is taken as the MFR of (A).

[0024] The content of (A) contained in the thermoplastic resin composition is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, even more preferably 15 parts by mass or more, and particularly preferably 20 parts by mass or more, based on 100 parts by mass of the total amount of (A), (B), and (B') in order to improve fluidity. The content of (A) contained in the thermoplastic resin composition is preferably 95 parts by mass or less, more preferably 80 parts by mass or less, even more preferably 65 parts by mass or less, and particularly preferably 49 parts by mass or less, based on 100 parts by mass of the total amount of (A), (B), and (B') in order to improve the antifouling performance of the thermoplastic resin composition and the antibacterial activity against Staphylococcus aureus and Escherichia coli. The content of (A) contained in the thermoplastic resin composition is preferably 5 parts by mass or more and 95 parts by mass or less, more preferably 10 parts by mass or more and 80 parts by mass or less, even more preferably 15 parts by mass or more and 65 parts by mass or less, and particularly preferably 20 parts by mass or more and 49 parts by mass or less, where the total amount of (A), (B), and (B') is 100 parts by mass.

[0025] The ratio of the content of (B) to the content of (A) ((B) / (A)) is preferably 0.3 or more, more preferably 1.0 or more, and even more preferably 1.5 or more, in order to improve the antifouling performance of the thermoplastic resin composition and to improve the antibacterial activity against Staphylococcus aureus and Escherichia coli. The ratio of the content of (B) to the content of (A) is preferably 4.0 or less, more preferably 3.0 or less, and even more preferably 2.3 or less, in order to improve the fluidity of the thermoplastic resin composition. The ratio of the content of (B) to the content of (A) is preferably 0.3 or more and 4.0 or less, more preferably 1.0 or more and 3.0 or less, and even more preferably 1.5 or more and 2.3 or less.

[0026] The ratio of the content of (B+B') to the content of (A) ((B+B') / (A)) is preferably 0.3 or more, more preferably 1.0 or more, and even more preferably 1.5 or more, in order to improve the antifouling performance of the thermoplastic resin composition and to improve the antibacterial activity against Staphylococcus aureus and Escherichia coli. The ratio of the content of (B+B') to the content of (A) is preferably 4.0 or less, more preferably 3.0 or less, and even more preferably 2.3 or less, in order to improve the fluidity of the thermoplastic resin composition. The ratio of the content of (B+B') to the content of (A) is preferably 0.3 or more and 4.0 or less, more preferably 1.0 or more and 3.0 or less, and even more preferably 1.5 or more and 2.3 or less.

[0027] Assuming that the content of propylene resin (A) is A parts by mass, the content of ethylene copolymer rubber (B) is B parts by mass, the content of copolymer (B') is B' parts by mass, the content of propylene homopolymer is A1 parts by mass, the content of heterophasic polymer material is A2 parts by mass, and the content of propylene random copolymer is A3 parts by mass, and A + B + B' is 100 parts by mass, (B + B') / (A1 + A2 + B + B') is preferably 0.51 or more, more preferably 0.55 or more, and even more preferably 0.60 or more to improve the antifouling performance of the thermoplastic resin composition and the antibacterial activity against Staphylococcus aureus and Escherichia coli. (B + B') / (A1 + A2 + B + B') is preferably 1.0 or less, more preferably 0.95 or less, and even more preferably 0.90 or less to improve the flowability of the thermoplastic resin composition. (B+B') / (A1+A2+B+B') is preferably 0.51 or more and 1.0 or less, more preferably 0.55 or more and 0.95 or less, and even more preferably 0.60 or more and 0.90 or less.

[0028] When the total mass of the thermoplastic resin composition is taken as 100 mass%, the total content of (A) and (B+B') is preferably 47 mass% or more, more preferably 57 mass% or more, and when the total mass of the thermoplastic resin composition is taken as 100 mass%, the total content of (A) and (B+B') is preferably 99.995 mass% or less, more preferably 99.975 mass% or less.

[0029] <Ethylene copolymer rubber (B)> Examples of the ethylene copolymer rubber (B) include an ethylene copolymer (hereinafter sometimes referred to as (B-1)) having monomer units derived from at least one selected from the group consisting of propylene, an α-olefin having from 4 to 10 carbon atoms, and a vinyl carboxylate, and monomer units derived from ethylene, or a crosslinked product thereof (hereinafter sometimes referred to as (B-2)). The content of the monomer units derived from ethylene in (B) is 50% by mass or more relative to 100% by mass of the total amount of (B), i.e., it is different from the propylene resin (A). The thermoplastic resin composition may contain only one type of ethylene copolymer rubber (B), or may contain two or more types.

[0030] The gel fraction of (B-2) is preferably 50% or more and 100% or less. The gel fraction is determined by the following method. Approximately 1 g of (B-2) and an empty wire basket (X) made of wire mesh (opening: 400 mesh) are weighed. (B-2) is placed in the wire basket, and the wire basket containing (B-2) is introduced into the extraction tube of a Soxhlet extractor. 300 ml of o-xylene is introduced into the flask. The mixture is refluxed for 24 hours to perform extraction. After extraction, the wire basket is removed from the extraction tube and dried under reduced pressure at 100°C in a vacuum dryer. The dried wire basket (Y) is weighed. The gel fraction (% by mass) is calculated using the following formula: Gel fraction = ((mass of (Y) - mass of (X)) / measured sample mass) × 100

[0031] (B-2) can be obtained by crosslinking (B-1). Examples of a crosslinking method include melt-kneading a composition containing (B-1) and a crosslinking agent (E) (hereinafter, sometimes simply referred to as (E)). Crosslinking may be carried out simultaneously with the production of the thermoplastic resin composition of this embodiment. In this case, a composition containing (B-2) and (A) can be produced by melt-kneading a composition containing (B-1), (A), and (E).

[0032] (B-1) is an ethylene copolymer having no crosslinked structure, and its gel fraction is 0%.

[0033] Examples of α-olefins having 4 to 10 carbon atoms include 1-butene, 2-methylpropylene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene. The α-olefins having 4 to 10 carbon atoms may be used alone or in combination of two or more.

[0034] Examples of vinyl carboxylates include vinyl acetate.

[0035] The monomer unit derived from at least one selected from the group consisting of propylene, an α-olefin having from 4 to 10 carbon atoms, and a vinyl carboxylate is preferably a monomer unit derived from propylene, a monomer unit derived from 1-butene, a monomer unit derived from 1-octene, or a monomer unit derived from vinyl acetate.

[0036] (B-1) may contain, in addition to monomer units derived from at least one selected from the group consisting of propylene, α-olefins having from 4 to 10 carbon atoms, and vinyl carboxylates, and monomer units derived from ethylene, monomer units derived from other monomers. Examples of such other monomers include conjugated dienes having from 4 to 8 carbon atoms, such as 1,3-butadiene, 2-methyl-1,3-butadiene, 1,3-pentadiene, and 2,3-dimethyl-1,3-butadiene; non-conjugated dienes having from 5 to 15 carbon atoms, such as dicyclopentadiene, 5-ethylidene-2-norbornene, 1,4-hexadiene, 1,5-dicyclooctadiene, 7-methyl-1,6-octadiene, and 5-vinyl-2-norbornene; unsaturated carboxylic acid esters, such as methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, and ethyl methacrylate; and unsaturated carboxylic acids, such as acrylic acid and methacrylic acid. The other monomer is preferably a non-conjugated diene having from 5 to 15 carbon atoms, more preferably 5-ethylidene-2-norbornene or dicyclopentadiene. (B-1) may contain two or more types of monomer units derived from the other monomer.

[0037] In (B-1), the content of the ethylene-derived monomer units is preferably from 50 to 95% by mass, and more preferably from 55 to 85% by mass, relative to 100% by mass of the total of the ethylene-derived monomer units and at least one selected from the group consisting of propylene, an α-olefin having from 4 to 10 carbon atoms, and a vinyl carboxylate. In (B-1), the content of the ethylene-derived monomer units is preferably from 5 to 50% by mass, and more preferably from 15 to 45% by mass, relative to 100% by mass of the total of the ethylene-derived monomer units and at least one selected from the group consisting of propylene, an α-olefin having from 4 to 10 carbon atoms, and a vinyl carboxylate.

[0038] With respect to 100% by mass of the total amount of (B-1), the total content of monomer units derived from ethylene and monomer units derived from at least one selected from the group consisting of propylene, α-olefins having from 4 to 10 carbon atoms, and vinyl carboxylic acid esters is preferably 55% by mass or more, more preferably 65% ​​by mass or more.

[0039] The content of the ethylene-derived monomer units and the content of the at least one monomer selected from the group consisting of propylene, an α-olefin having from 4 to 10 carbon atoms, and a vinyl carboxylate can be determined from (B-1) by, for example, infrared spectroscopy. Specifically, the infrared absorption spectrum of (B-1) is measured using an infrared spectrophotometer, and the content of the ethylene-derived monomer units and the content of the at least one monomer selected from the group consisting of propylene, an α-olefin having from 4 to 10 carbon atoms, and a vinyl carboxylate are calculated according to the method described in "Characterization of Polyethylene by Infrared Absorption Spectroscopy (Takayama, Usami et al.)" or "Die Makromolekulare Chemie, 177, 461 (1976) (McRae, MA, Madam S, WF et al.)."

[0040] When (B-1) has monomer units derived from other monomers in addition to monomer units derived from ethylene and monomer units derived from at least one selected from the group consisting of propylene, an α-olefin having from 4 to 10 carbon atoms, and a vinyl carboxylic acid ester, the content of monomer units derived from other monomers is preferably 45% by mass or less, and more preferably 35% by mass or less, relative to 100% by mass of the total amount of (B-1).

[0041] The content of the monomer units derived from other monomers in (B-1) can be determined, for example, by infrared spectroscopy. Specifically, an infrared spectrophotometer is used to measure the peak intensity of the peak derived from the other monomer in (B-1), and the content of the monomer units derived from other monomers in (B-1) is calculated from the peak intensity.

[0042] Examples of (B-1) include ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer, ethylene-propylene-1-butene copolymer, ethylene-propylene-1-hexene copolymer, ethylene-propylene-1-octene copolymer, ethylene-propylene-5-ethylidene-2-norbornene copolymer, ethylene-propylene-dicyclopentadiene copolymer, ethylene-propylene-1,4-hexadiene copolymer, ethylene-propylene-5-vinyl-2-norbornene copolymer, and ethylene-vinyl acetate copolymer. (B-1) is preferably an ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-1-octene copolymer, ethylene-propylene-5-ethylidene-2-norbornene copolymer, or ethylene-vinyl acetate copolymer. (B-1) may be used alone or in combination of two or more. When two or more types of (B-1) are used in combination, two or more types are preferably selected from the group consisting of ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-1-octene copolymer, ethylene-propylene-5-ethylidene-2-norbornene copolymer, and ethylene-vinyl acetate copolymer, and more preferably ethylene-propylene-5-ethylidene-2-norbornene copolymer and ethylene-vinyl acetate copolymer. In order to reduce the compression set of the thermoplastic resin composition, the ratio of ethylene-vinyl acetate copolymer to ethylene-propylene-5-ethylidene-2-norbornene copolymer is preferably 2 or less, more preferably 1 or less, and even more preferably 0.5 or less.

[0043] The Mooney viscosity (ML) of (B-1) measured at 125°C 1+4125°C) is preferably, for example, 20 or more and 350 or less.

[0044] Mooney viscosity (ML 1+4 125°C) is measured in accordance with JIS K6300. When (B-1) and the mineral oil (D) described later are mixed in advance, the Mooney viscosity (ML 1+4 125℃) can be calculated using the following formula (1). log(ML1 / ML2)=0.0066(△PHR) (1) ML1: Mooney viscosity of (B-1) ML2: Mooney viscosity of the mixture of (B-1) and (D) △PHR: Content of (D) per 100 parts by mass of (B-1)

[0045] The intrinsic viscosity of (B-1) measured in tetralin at 135°C is preferably 1 dL / g or more, more preferably 2 dL / g or more, and even more preferably 4 dL / g or more to improve the antibacterial activity of the thermoplastic resin composition against Staphylococcus aureus and Escherichia coli. To improve the flowability of the thermoplastic resin composition, the intrinsic viscosity of (B-1) is preferably 8 dL / g or less, more preferably 6 dL / g or less, and even more preferably 5.5 dL / g or less. The intrinsic viscosity of (B-1) is preferably 1 dL / g or more and 8 dL / g or less, more preferably 2 dL / g or more and 6 dL / g or less, and even more preferably 4 dL / g or more and 5.5 dL / g or less.

[0046] The intrinsic viscosity is a value obtained by measuring the reduced viscosity in tetralin at 135°C using an Ubbelohde viscometer and then extrapolating the value according to the calculation method described on page 491 of "Polymer Solutions, Polymer Experiments 11" (published by Kyoritsu Shuppan Co., Ltd. in 1982).

[0047] Examples of the production method of (B-1) include known polymerization methods such as slurry polymerization, solution polymerization, bulk polymerization, and gas phase polymerization using known complex catalysts such as Ziegler-Natta catalysts, metallocene complexes, and non-metallocene complexes such as Post-Kaminsky catalysts.

[0048] The content of (B) contained in the thermoplastic resin composition is preferably 5 parts by mass or more, more preferably 20 parts by mass or more, even more preferably 35 parts by mass or more, and particularly preferably 51 parts by mass or more, based on 100 parts by mass of the total amount of (A), (B), and (B'), in order to improve the antifouling performance of the thermoplastic resin composition and improve the antibacterial activity against Staphylococcus aureus and Escherichia coli. In order to improve the flowability of the thermoplastic resin composition, the content of (B) is preferably 95 parts by mass or less, more preferably 80 parts by mass or less, even more preferably 75 parts by mass or less, and particularly preferably 70 parts by mass or less, based on 100 parts by mass of the total amount of (A), (B), and (B'). The content of (B) is preferably 5 to 95 parts by mass, more preferably 20 to 80 parts by mass, even more preferably 35 to 75 parts by mass, and particularly preferably 51 to 70 parts by mass, based on 100 parts by mass of the total of (A), (B), and (B'). The content of (B) is the total content of (B-1) and (B-2). The mass of (B-2) can be considered to be the same as the mass of (B-1) used as a raw material.

[0049] <Copolymer (B') containing monomer units derived from an aromatic vinyl compound and monomer units derived from a conjugated diene compound> Examples of the copolymer (B') containing a monomer unit derived from an aromatic vinyl compound and a monomer unit derived from a conjugated diene compound include an aromatic vinyl compound-conjugated diene compound polymer, an aromatic vinyl compound-conjugated diene compound-aromatic vinyl compound polymer, and hydrogenated products thereof. Among these, a hydrogenated product of an aromatic vinyl compound-conjugated diene compound-aromatic vinyl compound polymer is preferred.

[0050] Examples of the aromatic vinyl compound in (B') include styrene, α-methylstyrene, o-, m-, and p-methylstyrene, 1,3-dimethylstyrene, vinylxylene, monochlorostyrene, dichlorostyrene, monobromostyrene, dibromostyrene, ethylstyrene, and vinylnaphthalene, with styrene being preferred.

[0051] Examples of the conjugated diene compound in (B') include butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 2-neopentyl-1,3-butadiene, 2-chloro-1,3-butadiene, and 2-cyano-1,3-butadiene, with butadiene or isoprene being preferred.

[0052] The content of the monomer units derived from aromatic vinyl compounds is preferably 10% by mass or more and 50% by mass or less, more preferably 15% by mass or more and 45% by mass or less, and even more preferably 20% by mass or more and 40% by mass or less, in order to prevent mold contamination during molding of the thermoplastic resin composition and to improve the tensile properties and appearance of the molded product. However, the total amount of the copolymer having monomer units derived from aromatic vinyl compounds and monomer units derived from conjugated diene compounds is considered to be 100% by mass. The content of the monomer units derived from aromatic vinyl compounds can be determined by H-NMR measurement.

[0053] The content of the monomer units derived from the conjugated diene compound is preferably 50% by mass or more and 90% by mass or less, more preferably 55% by mass or more and 85% by mass or less, and even more preferably 60% by mass or more and 80% by mass or less. However, the total amount of the copolymer having the monomer units derived from the aromatic vinyl compound and the monomer units derived from the conjugated diene compound is taken as 100% by mass. The content of the monomer units derived from the conjugated diene compound can be determined by H-NMR measurement.

[0054] The hydrogenation rate of the hydrogenated product (B') is preferably 80% or more, more preferably 90% or more, where the amount of double bonds in the monomer units derived from the conjugated diene compound in the copolymer before hydrogenation is taken as 100%.

[0055] Examples of the production method of (B') include the method described in Japanese Patent Publication No. 40-23798. Furthermore, methods for hydrogenating a copolymer having monomer units derived from an aromatic vinyl compound and monomer units derived from a conjugated diene compound include the methods described in Japanese Patent Publication Nos. 42-8704, 43-6636, 59-133203, and 60-79005. Examples of copolymers having monomer units derived from an aromatic vinyl compound and monomer units derived from a conjugated diene compound include commercially available products such as "KRATON-G" manufactured by Kraton Polymers, "Septon" manufactured by Kuraray Co., Ltd., and "Tuftec" manufactured by Asahi Kasei Corporation.

[0056] The content of (B') contained in the thermoplastic resin composition is preferably 5 parts by mass or more, more preferably 20 parts by mass or more, even more preferably 35 parts by mass or more, and particularly preferably 51 parts by mass or more, based on 100 parts by mass of the total amount of (A), (B), and (B'), in order to improve the antifouling performance of the thermoplastic resin composition and improve the antibacterial activity against Staphylococcus aureus and Escherichia coli. In order to improve the flowability of the thermoplastic resin composition, the content of (B') is preferably 95 parts by mass or less, more preferably 80 parts by mass or less, even more preferably 75 parts by mass or less, and particularly preferably 70 parts by mass or less, based on 100 parts by mass of the total amount of (A), (B), and (B'). The content of (B') is preferably 5 parts by mass or more and 95 parts by mass or less, more preferably 20 parts by mass or more and 80 parts by mass or less, even more preferably 35 parts by mass or more and 75 parts by mass or less, and particularly preferably 51 parts by mass or more and 70 parts by mass or less, where the total amount of (A), (B), and (B') is 100 parts by mass.

[0057] The total content of (B) and (B') contained in the thermoplastic resin composition is preferably 5 parts by mass or more, more preferably 20 parts by mass or more, even more preferably 35 parts by mass or more, and particularly preferably 51 parts by mass or more, based on 100 parts by mass of the total amount of (A), (B), and (B'), in order to improve the antifouling performance of the thermoplastic resin composition and improve the antibacterial activity against Staphylococcus aureus and Escherichia coli. In order to improve the flowability of the thermoplastic resin composition, the total content of (B) and (B') is preferably 95 parts by mass or less, more preferably 80 parts by mass or less, even more preferably 75 parts by mass or less, and particularly preferably 70 parts by mass or less, based on 100 parts by mass of the total amount of (A), (B), and (B'). The total content of (B) and (B') is preferably 5 parts by mass or more and 95 parts by mass or less, more preferably 20 parts by mass or more and 80 parts by mass or less, even more preferably 35 parts by mass or more and 75 parts by mass or less, and particularly preferably 51 parts by mass or more and 70 parts by mass or less, where the total amount of (A), (B), and (B') is 100 parts by mass.

[0058] <Glycerin fatty acid ester (C)> The glycerin fatty acid ester (C) is an ester of a fatty acid having 8 to 14 carbon atoms. Specific examples of fatty acids having 8 to 14 carbon atoms include caprylic acid, capric acid, lauric acid, and myristic acid. The fatty acid ester constituting the glycerin fatty acid ester may be, for example, a mono-fatty acid ester, a di-fatty acid ester, or a tri-fatty acid ester. Of these, the fatty acid ester is preferably a mono-fatty acid ester.

[0059] Fatty acids with fewer than 8 carbon atoms are undesirable because they can cause severe skin irritation and produce a strong unpleasant odor. Furthermore, fatty acids with more than 14 carbon atoms do not exhibit good antibacterial activity against Staphylococcus aureus and Escherichia coli. The fatty acids used may be one type or a combination of two or more types.

[0060] Examples of glycerin constituting the glycerin fatty acid ester used in this embodiment include monoglycerin, diglycerin, triglycerin, tetraglycerin, and pentaglycerin. Among these, diglycerin is preferred as the glycerin. That is, the glycerin fatty acid ester (C) is preferably a diglycerin fatty acid ester.

[0061] Specific examples of the glycerin fatty acid ester (C) include monoglycerin monocaprylate, monoglycerin monocaprate, monoglycerin monolaurate, monoglycerin monomyristate, diglycerin monocaprylate, diglycerin monocaprate, diglycerin monolaurate, diglycerin monomyristate, triglycerin monocaprylate, triglycerin monocaprate, triglycerin monolaurate, triglycerin monomyristate, tetraglycerin monocaprylate, tetraglycerin monocaprate, tetraglycerin monolaurate, tetraglycerin monomyristate, pentaglycerin monocaprylate, pentaglycerin monocaprate, pentaglycerin monolaurate, and pentaglycerin monomyristate. Among these, the glycerin fatty acid ester (C) is preferably a diglycerin monofatty acid ester, specifically, diglycerin monocaprylate, diglycerin monocaprate, or diglycerin monomyristate.Moreover, a monolaurate structure is preferred, specifically, diglycerin monolaurate, triglycerin monolaurate, tetraglycerin monolaurate, or pentaglycerin monolaurate.

[0062] The ratio of the content of (C) to the content of (B) ((C) / (B)) is preferably 0.025 or more, more preferably 0.03 or more, and even more preferably 0.04 or more, in order to improve antifouling performance and antibacterial activity against Staphylococcus aureus and Escherichia coli. The ratio of the content of (C) to the content of (B) is preferably 0.5 or less, more preferably 0.2 or less, and even more preferably 0.1 or less. The ratio of the content of (C) to the content of (B) is preferably 0.025 or more and 0.5 or less, more preferably 0.03 or more and 0.2 or less, and even more preferably 0.04 or more and 0.1 or less.

[0063] In order to improve antifouling performance and antibacterial activity against Staphylococcus aureus and Escherichia coli, the ratio of the content of (C) to the content of (B+B') ((C) / (B+B')) is preferably 0.025 or more, more preferably 0.03 or more, and even more preferably 0.04 or more. The ratio of the content of (C) to the content of (B+B') is preferably 0.5 or less, more preferably 0.2 or less, and even more preferably 0.1 or less. The ratio of the content of (C) to the content of (B+B') is preferably 0.025 or more and 0.5 or less, more preferably 0.03 or more and 0.2 or less, and even more preferably 0.04 or more and 0.1 or less.

[0064] To improve antifouling performance and antibacterial activity against Staphylococcus aureus and Escherichia coli, the content of (C) in the thermoplastic resin composition is preferably 0.00001% by mass or more, more preferably 0.0001% by mass or more, more preferably 0.001% by mass or more, more preferably 0.01% by mass or more, more preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1% by mass or more, based on 100% by mass of the total amount of (A), (B), (B'), and (D). Furthermore, the content of (C) in the thermoplastic resin composition is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less, based on 100% by mass of the total amount of (A), (B), (B'), and (D). The content of (C) in the thermoplastic resin composition is preferably 0.1% by mass to 10% by mass, more preferably 0.5% by mass to 5% by mass, and even more preferably 1% by mass to 3% by mass, where the total amount of (A), (B), (B'), and (D) is 100 parts by mass. When the thermoplastic resin composition does not contain (D), the above content is the content when the total amount of (A), (B), and (B') is 100% by mass.

[0065] The (C) contained in the thermoplastic resin composition may be added directly to the kneader in a viscous liquid state, or may be heated to a highly fluid liquid and then added to the kneader. Alternatively, a high-concentration masterbatch may be prepared by kneading (C) with part or all of at least one selected from the group consisting of propylene resin (A), ethylene copolymer rubber (B), and copolymer (B') containing monomer units derived from an aromatic vinyl compound and monomer units derived from a conjugated diene compound. This masterbatch may then be added to the kneader together with other thermoplastic resin compositions and kneaded to adjust the content of (C) in the thermoplastic resin composition. From the viewpoint of productivity, it is more preferable to heat (C) to a highly fluid liquid and then add it to the thermoplastic resin composition, or to add it as a masterbatch.

[0066] <Mineral oil (D)> Mineral oil (D) is a high-boiling fraction of petroleum. Examples of (D) include aromatic mineral oil, naphthenic mineral oil, and paraffinic mineral oil. (D) is preferably a paraffinic mineral oil. (D) preferably has an average molecular weight of 300 or more and 1500 or less, and a pour point of 0°C or less.

[0067] The content of (D) in the thermoplastic resin composition is preferably 0.1% by mass or more, more preferably 30% by mass or more, based on 100% by mass of the total amount of (A), (B), (B'), and (D) to improve the fluidity and antifouling performance of the thermoplastic resin composition and to improve antibacterial activity against Staphylococcus aureus and Escherichia coli, and is preferably 60% by mass or less, more preferably 50% by mass or less, based on 100% by mass of the total amount of (A), (B), (B'), and (D). The content of (D) in the thermoplastic resin composition is preferably 0.1% by mass or more and 60% by mass or less, more preferably 30% by mass or more and 50% by mass or less, based on 100% by mass of the total amount of (A), (B), (B'), and (D).

[0068] <Crosslinking agent (E)> Examples of the crosslinking agent (E) include organic peroxides, sulfur compounds, and alkylphenol resins. Organic peroxides are preferred as (E).

[0069] Examples of organic peroxides include ketone peroxides, diacyl peroxides, hydroperoxides, dialkyl peroxides, peroxyketals, alkyl peresters, percarbonates, peroxydicarbonates, and peroxyesters.

[0070] Specific examples of organic peroxides include dicumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne, 1,3-bis(t-butylperoxyisopropyl)benzene, t-butylcumyl peroxide, di-t-butyl peroxide, 2,2,4-trimethylpentyl-2-hydroperoxide, diisopropylbenzohydroperoxide, cumene peroxide, t-butyl peroxide, 1,1-di(t-butylperoxy)3,5,5-trimethylcyclohexane, 1,1-di-t-butylperoxycyclohexane, isobutyl peroxide, 2,4-dichlorobenzoyl peroxide, o-methylbenzoyl peroxide, bis-3,5,5-trimethylhexanoyl peroxide, lauroyl peroxide, benzoyl peroxide, and p-chlorobenzoyl peroxide. The organic peroxides may be used alone or in combination of two or more kinds.

[0071] (E) may be used in combination with a crosslinking aid to increase the degree of crosslinking of (B-2) above. The crosslinking aid is preferably a compound having two or more double bonds. Examples of the crosslinking aid include peroxide crosslinking aids such as N,Nm-phenylene bismaleimide, toluylene bismaleimide, p-quinone dioxime, nitrosobenzene, diphenyl guanidine, and trimethylolpropane; divinylbenzene, triallyl cyanurate, triallyl isocyanurate, ethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, and allyl methacrylate, with trimethylolpropane trimethacrylate being preferred.

[0072] The blending amount of (E) is preferably 0.01% by mass or more and 10% by mass or less, more preferably 0.1% by mass or more and 5% by mass or less, and even more preferably 0.2% by mass or more and 3% by mass or less, where the total amount of (A), (B-1), and (D) is 100% by mass.

[0073] When a crosslinking aid is used together with (E), the amount of the crosslinking aid blended is preferably 0.01% by mass or more and 10% by mass or less, and more preferably 0.1% by mass or more and 2% by mass or less, with the total amount of (A), (B-1), and (D) being 100% by mass.

[0074] Since (E) is mainly used for the crosslinking reaction between (A) and (B), it may be added at any timing, such as before or after the addition of other additives, as long as it is after the addition of component (B) or (B'). However, in order to obtain a molded product with a uniform appearance, it is preferable to add (E) and then add (C) after the crosslinking reaction has progressed.

[0075] <Lubricant (F)> Examples of lubricants (F) include fatty acid amides, silicone oils, higher alcohols, and aliphatic esters excluding component (C). (F) is preferably a fatty acid amide. (F) may be used alone or in combination of two or more.

[0076] Examples of fatty acid amides include fatty acid monoamides such as lauric acid amide, myristic acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, oleic acid amide, and erucic acid amide; and fatty acid bisamides such as ethylene bisstearic acid amide, ethylene bisbehenic acid amide, ethylene bisoleic acid amide, ethylene biserucic acid amide, and ethylene bislauric acid amide; with oleic acid amide, stearic acid amide, and erucic acid amide being preferred.

[0077] Examples of silicone oils include dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, α-ωbis(3-hydroxypropyl)polydimethylsiloxane, polyoxyalkylene (C2-C4) dimethylpolysiloxane, and condensates of polyorgano (C1-C2 alkyl and / or phenyl) siloxane and polyalkylene (C2-C3) glycol.

[0078] Examples of fatty acid esters excluding component (C) include fatty acid sorbitan, sucrose fatty acid ester, glycerin acetate fatty acid ester, and glycerin fatty acid ester having an ester of a fatty acid having 16 or more carbon atoms.

[0079] Examples of fatty acid sorbitan include sorbitan monostearate, sorbitan monoisostearate, sorbitan sesquistearate, sorbitan sesquiisostearate, sorbitan tristearate, sorbitan sesquioleate, sorbitan monooleate, sorbitan trioleate, and sorbitan monolaurate, with sorbitan monostearate being preferred.

[0080] Examples of glycerin fatty acid esters having an ester of a fatty acid having 16 or more carbon atoms include monoglyceride stearate, monoglycerin oleate, monoglycerin linoleate, monoglycerin palmitate, diglyceride stearate, diglycerin oleate, diglycerin linoleate, diglycerin palmitate, triglyceride stearate, triglycerin oleate, triglycerin linoleate, and triglycerin palmitate, with monoglyceride stearate and monoglycerin palmitate being preferred.

[0081] The blending amount of (F) is preferably 0.01% by mass or more and 1% by mass or less, more preferably 0.02% by mass or more and 0.5% by mass or less, and even more preferably 0.03% by mass or more and 0.2% by mass or less, based on 100% by mass of the total amount of (A), (B-1), and (D).

[0082] <Antioxidant (G)> Examples of the antioxidant (G) include phenol-based antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, lactone-based antioxidants, vitamin-based antioxidants, etc. The antioxidants may be used alone or in combination of two or more.

[0083] Examples of phenolic antioxidants include 2,6-di-tert-butyl-p-cresol, tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dimethylethyl}-2,4,8,10-tetraoxaspiro[5.5]undecane, α-tocophenols, and the like, as well as phenolic phosphorus antioxidants having a phenol skeleton, such as 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]

[0033] Examples of suitable hydroxybenzoates include tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dimethylethyl}-2,4,8,10-tetraoxaspiro[5.5]undecane, and 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepin-6-yl)oxy]propyl}phenol.

[0084] Examples of phosphorus-based antioxidants include tris(2,4-di-tert-butylphenyl)phosphite, trisnonylphenyl phosphite, diphenyl isooctyl phosphite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite, diphenyl isodecyl phosphite, diphenyl mono(tridecyl) phosphite, phenyl diisodecyl phosphite, phenyl di(tridecyl) phosphite, tris(2-ethylhexyl) phosphite, tris(isodecyl) phosphite, tris(tridecyl) phosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, and tris(2,4-di-tert-butylphenyl)phosphite, with bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite and tris(2,4-di-tert-butylphenyl)phosphite being preferred.

[0085] The blending amount of (G) is preferably 0.01% by mass or more and 1% by mass or less, more preferably 0.02% by mass or more and 0.5% by mass or less, and even more preferably 0.03% by mass or more and 0.2% by mass or less, based on 100% by mass of the total amount of (A), (B-1), and (D).

[0086] <Other ingredients> The thermoplastic resin composition of the present embodiment may contain other additives and other thermoplastic resins in addition to the above (A) to (G).

[0087] Examples of other additives include inorganic fillers, organic fillers, ultraviolet absorbers, heat stabilizers, light stabilizers, antistatic agents, nucleating agents, pigments, adsorbents, metal chlorides, silicone compounds, antibacterial agents, antiviral agents, antimoss agents, and anti-algae agents. Note that antibacterial agents are compounds that prevent the growth of bacteria such as Escherichia coli and Staphylococcus aureus.

[0088] Examples of inorganic fillers include talc, calcium carbonate, and calcined kaolin.

[0089] Examples of organic fillers include fibers, wood flour, and cellulose powder.

[0090] Examples of the ultraviolet absorber include benzotriazole-based ultraviolet absorbers, tridiamine-based ultraviolet absorbers, anilide-based ultraviolet absorbers, and benzophenone-based ultraviolet absorbers.

[0091] Examples of the light stabilizer include hindered amine light stabilizers and benzoate light stabilizers.

[0092] Examples of metal chlorides include iron chloride and calcium chloride.

[0093] Other thermoplastic resins include ethylene polymers containing more than 95% by mass and 100% by mass or less of monomer units derived from ethylene, relative to 100% by mass of the total amount of the ethylene polymers.

[0094] Examples of ethylene polymers containing more than 95% by mass and not more than 100% by mass of monomer units derived from ethylene include ethylene homopolymers and copolymers having monomer units derived from ethylene and monomer units derived from at least one member selected from the group consisting of propylene and α-olefins having from 4 to 10 carbon atoms.

[0095] The content of the other thermoplastic resin is preferably 40% by mass or less relative to the total mass of the thermoplastic resin composition (100% by mass).

[0096] The thermoplastic resin composition according to this embodiment can be obtained by melt-kneading (A), (B), and (C), and, if necessary, (D), (E), (F), (G), and other components.

[0097] Examples of melt-kneading devices include open-type mixing rolls, closed-type Banbury mixers, extruders, kneaders, continuous mixers, etc., and closed-type devices are preferred. All of the components to be kneaded may be melt-kneaded all at once, or some of the components may be kneaded first and then the remaining components may be added and melt-kneaded, or melt-kneading may be performed once or twice or more times. The temperature during melt-kneading is preferably 150°C or higher and 250°C or lower, and the time is preferably 30 seconds or higher and 30 minutes or lower. The components to be kneaded may be added in any order or simultaneously.

[0098] [Molded body] The molded article according to this embodiment contains the above-described thermoplastic resin composition.

[0099] The molded article can be molded by a known molding method such as extrusion molding, calendar molding, or injection molding using a conventional apparatus used for molding thermoplastic resins.

[0100] The molded article according to this embodiment can be used, for example, for bathroom and bathtub parts, rubber-related parts, automobile parts, electrical parts, home appliance parts, furniture components, building materials, footwear parts, sports equipment parts, medical and nursing care-related products, and other industrial materials.

[0101] The thermoplastic resin composition and molded article according to this embodiment are not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. In addition, the configurations, methods, etc. of embodiments other than those described above may be arbitrarily adopted and combined, and the configurations, methods, etc. of one embodiment described above may be applied to the configurations, methods, etc. of other embodiments described above. [Example]

[0102] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. The measured values ​​of each item in the examples and comparative examples were measured by the following methods.

[0103] (Physical property measurement method) [Mooney viscosity (ML 1+4 125°C)] Measurement was carried out in accordance with JIS K6300. When component (B1) and component (D) were mixed in advance, the Mooney viscosity (ML 1+4 125°C) was calculated using the following formula (1). log(ML1 / ML2)=0.0066(△PHR) (1) ML1: Mooney viscosity of component (B1) ML2: Mooney viscosity of the mixture of component (B1) and component (D1) △PHR: Content of component (D) per 100 parts by mass of component (B1)

[0104] [Contents of monomer units derived from ethylene, monomer units derived from propylene, and monomer units derived from 5-ethylidene-2-norbornene (unit: mass%)] Measurement was carried out by infrared spectroscopy. Specifically, the measurement was carried out by the following method. An ethylene-propylene-5-ethylidene-2-norbornene copolymer was formed into a film with a thickness of approximately 0.5 mm. Using an infrared spectrophotometer, the peak (1688 cm) derived from 5-ethylidene-2-norbornene of the obtained film was measured. -1 The intensity of the absorption peak (absorption peak) was measured to calculate the content of the monomer derived from 5-ethylidene-2-norbornene in the copolymer. Next, a new ethylene-propylene-5-ethylidene-2-norbornene copolymer was formed into a film approximately 0.1 mm thick. The infrared absorption spectrum of the resulting film was measured using an infrared spectrophotometer, and the content of the monomer units derived from ethylene and the content of the monomer units derived from propylene were calculated according to the method described in the literature (Characterization of Polyethylene by Infrared Absorption Spectroscopy, Takayama, Usami et al., or Die Makromolekulare Chemie, 177, 461 (1976), McRae, MA, Madam S, WF et al.).

[0105] [Antibacterial test] Antibacterial tests against Staphylococcus aureus and Escherichia coli were conducted in accordance with JIS Z 2801. 0.4 mL of bacterial solution was spread on the test piece (molded body), and the number of bacteria was counted after 24 hours of incubation, and the common logarithm was evaluated.

[0106] [Anti-fouling test] Letters were written on the resin molded body using Hi-Macchi Care (Zebra Corporation) and then left in an oven at 60°C for 20 hours. An 11cm x 15cm piece of toilet paper was folded and thoroughly soaked in water, after which excess water was removed. The toilet paper was then lightly pressed against the letter on the sample after wiping and wiped back and forth 10 times. After wiping, the results were rated as follows: × if the letter was not erased, △ if some of the letter remained, and ◯ if the letter was almost erased or the outline of the letter was erased and the ink had spread thinly.

[0107] Component (A) Propylene polymer (A1-1): Propylene homopolymer, manufactured by Sumitomo Chemical Co., Ltd., trade name "Sumitomo Noblen D101", MFR (230°C, 21.18N) = 0.5g / 10min (A1-2): Propylene homopolymer, manufactured by Sumitomo Chemical Co., Ltd., trade name "Sumitomo Noblen H501N", MFR (230°C, 21.18N) = 3g / 10min (A1-3): Propylene homopolymer, manufactured by Sumitomo Chemical Co., Ltd., trade name "Sumitomo Noblen R101" (230°C, 21.18N) = 20g / 10min (A2-1): Propylene heterophasic polymer material, manufactured by Sumitomo Chemical Co., Ltd., product name "Sumitomo Noblen AZ564", MFR (230°C, 21.18N) = 27g / 10min, propylene homopolymer content = 87% by mass, copolymer content = 13% by mass, content of ethylene-derived monomer in copolymer = 46% by mass (A3-1): Propylene-ethylene random copolymer, manufactured by Sumitomo Chemical Co., Ltd., trade name "Sumitomo Noblen AZ144CE4", MFR (230°C, 21.18N) = 28g / 10min, content of ethylene-derived monomer = 4% by mass

[0108] Component (B) Ethylene copolymer rubber (B1+D1): A mixture of 100 parts by mass of ethylene-propylene-5-ethylidene-2-norbornene copolymer and 100 parts by mass of paraffinic mineral oil (D1) The Mooney viscosity (ML 1+4 125°C) = 210, content of monomer units derived from ethylene in (B1) = 66 mass%, content of monomer units derived from propylene in (B1) = 30 mass%, content of monomer units derived from 5-ethylidene-2-norbornene in (B1) = 4 mass% (B2): Ethylene-1-octene copolymer, manufactured by Dow Chemical Company, trade name "Engage 8842", content of monomer units derived from ethylene = 59% by mass, content of monomer units derived from 1-octene = 41% by mass, Mooney viscosity (ML 1+4 125℃)=23, density=0.857g / cm 3 (B3): Ethylene-1-butene copolymer manufactured by Dow Chemical Company, trade name "Engage 7487", content of monomer units derived from ethylene = 66 mass%, content of monomer units derived from 1-butene = 34 mass%, Mooney viscosity (ML 1+4 125℃)=47, density=0.860g / cm 3 (B4): Ethylene-vinyl acetate copolymer, manufactured by Sumitomo Chemical Co., Ltd., trade name "Sumitate KA-30", MFR (190°C, 21.18N) = 28g / 10min, content of monomer derived from ethylene = 72% by mass, content of monomer derived from vinyl acetate = 28% by mass

[0109] Component (B') A copolymer having a monomer unit derived from an aromatic vinyl compound and a monomer unit derived from a conjugated diene compound. (B'1): Kraton Polymer Japan Co., Ltd., trade name "Kraton (registered trademark) G1651HU" Content of monomer units derived from styrene = 33 mass%

[0110] Ingredient (C) Glycerin fatty acid ester (C1): Diglycerin monolaurate, manufactured by Riken Vitamin Co., Ltd., product name "Poem DL-100" (C2): Monoglycerin monolaurate, manufactured by Riken Vitamin Co., Ltd., product name "Poem M300" (C3): Polyglycerin laurate, manufactured by Taiyo Kagaku Co., Ltd., product name "Sunsoft Q-12S" (C4): Monoglycerin monostearate (Kao Corporation, product name "Electrostripper TS-5") (C5): Diglycerin monomyristate, manufactured by Riken Vitamin Co., Ltd., product name "Poem DM100" (C6): Monoglycerin Monocaprate, manufactured by Riken Vitamin Co., Ltd., product name "Poem M200"

[0111] Component (D) Mineral oil (D1): Paraffinic mineral oil, manufactured by Idemitsu Kosan Co., Ltd., product name "PW-380"

[0112] Component (E) Crosslinking Agent (E1): Kayaku Akzo Co., Ltd., product name "APO-10DL" (2,5-dimethyl-2,5-di(t-butylperoxy)hexane diluted to 10% with paraffinic mineral oil (Idemitsu Kosan Co., Ltd., product name "PW-100"))

[0113] (F1): Oleic acid amide, manufactured by Marubishi Yuka Kogyo Co., Ltd., product name "Denon SL-12" (F2): Erucic acid amide, manufactured by Nippon Fine Chemical Co., Ltd., product name "Neutron S" (F3): Siloxane polyolefin compound, manufactured by Evonik, product name "TEGOMER(R) AntiScratch 100" (F4): Sorbitan monostearate, manufactured by Wako Pure Chemical Industries, Ltd. (G1): Antioxidant, product name "IRGANOX (registered trademark) 1010" manufactured by BASF Japan Ltd. (G2): Antioxidant, manufactured by Sumitomo Chemical Co., Ltd., product name "Sumilizer GA80" (H1): Crosslinking agent, manufactured by Seiko Chemical Co., Ltd., product name "Hicross MS50" (trimethylolpropane trimethacrylate diluted 50% with silicon oxide)

[0114] [Comparative Example 1] A thermoplastic resin composition was obtained by melt-kneading 20% ​​by mass of (A1-1), 80% by mass of (B1+D1), 3% by mass of (E1), 0.1% by mass of (F1), 0.1% by mass of (G1), and 0.4% by mass of (H1) in a twin-screw kneading extruder ("TEX34", manufactured by The Japan Steel Works, Ltd.) at a cylinder temperature of 200°C. The blending amounts of each component used as raw materials are shown in Table 3.

[0115] The resulting thermoplastic resin composition was melt-kneaded in a 100cc Labo Plastomill (manufactured by Toyo Seiki Seisakusho) at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a kneading time of 8 minutes. The melt-kneaded thermoplastic resin composition was compressed in a compression molding machine at 200°C and a maximum pressure of 10 MPa for 5 minutes, followed by a 5-minute cooling press molding to obtain a molded article measuring 160 mm in length, 160 mm in width, and 1 mm in thickness. This molded article was cut into a 50 mm in length, 50 mm in width, and 1 mm in thickness. Paper was placed on both sides of the specimen and the specimen was stored for at least one month. After storage, the paper was removed and the specimen was subjected to an antibacterial test using Staphylococcus aureus and Escherichia coli according to JIS Z2801. The common logarithm of the viable cell count after 24 hours is shown in Table 3. Furthermore, a stain-resistant test was also performed using the specimen after storage, from which the paper was removed.

[0116] Comparative Example 2 A thermoplastic resin composition was obtained by melt-kneading 95% by mass of (A1-2), 5% by mass of (D1), and 2% by mass of (C1) as raw materials in a Labo Plastomill (manufactured by Toyo Seiki Seisakusho, Ltd.) under conditions of a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a kneading time of 8 minutes. The blending amounts of each component used in the raw materials are shown in Table 1. The thermoplastic composition was molded in a compression molding machine in the same manner as in Comparative Example 1, except that the temperature of the compression molding machine was set to 220°C. The molded body was stored sandwiched between paper sheets, and then subjected to antibacterial and antifouling tests. The results are shown in Table 3.

[0117] [Example 1] Except for using 100% by mass of the thermoplastic resin composition obtained in Comparative Example 1 and 2% by mass of (C1) as raw materials, the mixture was kneaded in a Labo Plastomill and molded in a compression molding machine in the same manner as in Comparative Example 1. The molded body was stored sandwiched between papers, and then an antibacterial test and an antifouling test were performed. The results are shown in Table 1.

[0118] [Example 2] A thermoplastic resin composition was obtained by melt-kneading 35% by mass of (A2-1), 20% by mass of (A3-1), 20% by mass of (B2), 25% by mass of (B3), 2% by mass of (E1), 0.1% by mass of (F2), 0.1% by mass of (G2), and 0.5% by mass of (H1) in a twin-screw kneading extruder at a cylinder temperature of 200°C. Similar to Comparative Example 1, except that 100% by mass of the resulting thermoplastic resin composition and 2% by mass of (C1) were used, the composition was kneaded in a Labo Plastomill and molded in a compression molding machine. The molded body was stored between sheets of paper and then subjected to antibacterial and antifouling tests. The results are shown in Table 1.

[0119] [Example 3] A thermoplastic resin composition was obtained by melt-kneading 20% ​​by mass of (A1-3), 35% by mass of (B'1), 45% by mass of (D1), 0.05% by mass of (F2), and 0.1% by mass of (G1) in a twin-screw kneading extruder at a cylinder temperature of 200°C. Similar to Comparative Example 1, except that 100% by mass of the obtained thermoplastic resin composition and 2% by mass of (C1) were used, the composition was kneaded in a Labo Plastomill and molded in a compression molding machine. The molded body was stored sandwiched between papers and then subjected to antibacterial and antifouling tests. The results are shown in Table 1.

[0120] [Example 4] Except for using 100% by mass of the thermoplastic resin composition obtained in Comparative Example 1 and 1% by mass of (C1) as raw materials, the mixture was kneaded in a Labo Plastomill and molded in a compression molding machine in the same manner as in Comparative Example 1. The molded body was stored sandwiched between papers, and then an antibacterial test and an antifouling test were performed. The results are shown in Table 1.

[0121] [Example 5] The raw materials (A1-1) 20% by weight, (B1 + D1) 80% by weight, (E1) 3% by weight, (F1) 0.1% by weight, (G1) 0.1% by weight, and (H1) 0.4% by weight) were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by weight of (C1) was added, and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 1.

[0122] [Example 6] The raw materials (A1-1) 20% by mass, (B1+D1) 80% by mass, and (C1) 2% by mass were melt-kneaded in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a kneading time of 8 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine in the same manner as in Comparative Example 1, and the molded body was stored sandwiched between papers before undergoing antibacterial and antifouling tests. The results are shown in Table 1.

[0123] [Example 7] The raw materials (A1-1) 20% by mass, (B1+D1) 80% by mass, (E1) 3% by mass, and (H1) 0.4% by mass were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by mass of (C1) was added, and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine in the same manner as in Comparative Example 1. The molded body was sandwiched between paper sheets and stored, after which antibacterial and antifouling tests were performed. The results are shown in Table 1.

[0124] [Example 8] The raw materials (A1-1) 20% by mass, (B1+D1) 80% by mass, (C1) 2% by mass, and (F1) 0.1% by mass were melt-kneaded in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a kneading time of 8 minutes to obtain a thermoplastic resin composition. As in Comparative Example 1, the thermoplastic composition was molded in a compression molding machine, and the molded body was stored sandwiched between paper sheets before undergoing antibacterial and antifouling tests. The results are shown in Table 1.

[0125] [Example 9] The raw materials (A1-1) 20% by mass, (B1+D1) 80% by mass, (C1) 2% by mass, (F1) 0.1% by mass, and (G1) 0.1% by mass were melt-kneaded in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a kneading time of 8 minutes to obtain a thermoplastic resin composition. As in Comparative Example 1, the thermoplastic composition was molded in a compression molding machine, and the molded body was stored sandwiched between paper sheets before undergoing antibacterial and antifouling tests. The results are shown in Table 1.

[0126] [Example 10] The raw materials (A1-1) 20% by mass, (B1 + D1) 80% by mass, (E1) 3% by mass, (F1) 0.1% by mass, and (H1) 0.4% by mass were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by mass of (C1) was added, and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 1.

[0127] [Example 11] The raw materials (A1-1) 20% by weight, (B1 + D1) 80% by weight, (E1) 3% by weight, (F1) 0.1% by weight, (G1) 0.1% by weight, and (H1) 0.4% by weight) were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by weight of (C2) was added, and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 2.

[0128] [Example 12] The raw materials (A1-1) 20% by weight, (B1 + D1) 80% by weight, (E1) 3% by weight, (F1) 0.1% by weight, (G1) 0.1% by weight, and (H1) 0.4% by weight) were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by weight of (C3) was added, and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1. The molded body was sandwiched between paper sheets and stored, after which antibacterial and antifouling tests were performed. The results are shown in Table 2.

[0129] [Example 13] The raw materials (A1-1) 20% by weight, (B1 + D1) 80% by weight, (E1) 3% by weight, (F2) 0.1% by weight, (G1) 0.1% by weight, and (H1) 0.4% by weight) were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by weight of (C1) was added, and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 2.

[0130] [Example 14] The raw materials (A1-1) 20% by weight, (B1 + D1) 80% by weight, (E1) 3% by weight, (F1) 0.7% by weight, (G1) 0.1% by weight, and (H1) 0.4% by weight) were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by weight of (C1) was added, and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 2.

[0131] [Example 15] The raw materials (A1-1) 20% by weight, (B1 + D1) 80% by weight, (E1) 3% by weight, (F3) 0.1% by weight, (G1) 0.1% by weight, and (H1) 0.4% by weight were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by weight of (C1) was added, and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 2.

[0132] [Example 16] Except for using 100% by mass of the thermoplastic resin composition obtained in Comparative Example 1 and 0.5% by mass of (C1) as raw materials, the mixture was kneaded in a Labo Plastomill and molded in a compression molding machine in the same manner as in Comparative Example 1. The molded body was stored sandwiched between papers, and then an antibacterial test and an antifouling test were performed. The results are shown in Table 2.

[0133] [Example 17] Except for using 10% by mass of the thermoplastic resin composition obtained in Example 16 and 90% by mass of the thermoplastic resin composition obtained in Comparative Example 1 as raw materials, the mixture was kneaded in a Labo Plastomill and molded in a compression molding machine in the same manner as in Comparative Example 1. The molded bodies were stored sandwiched between papers, and then antibacterial and antifouling tests were conducted. The results are shown in Table 2.

[0134] [Example 18] The raw materials (A3-1) 60% by weight, (B2) 40% by weight, (E1) 3% by weight, (F1) 0.1% by weight, (G1) 0.1% by weight, and (H1) 0.4% by weight were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by weight of (C1) was added and the mixture was melt-mixed for 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 2.

[0135] [Example 19] The raw materials (A1-1) 20% by mass, (B1+D1) 80% by mass, (C1) 2% by mass, and (G1) 0.1% by mass were melt-kneaded in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a kneading time of 8 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine in the same manner as in Comparative Example 1, and the molded body was stored sandwiched between paper sheets before undergoing antibacterial and antifouling tests. The results are shown in Table 2.

[0136] [Example 20] The raw materials (A1-1) 20% by mass, (B1 + D1) 80% by mass, (E1) 3% by mass, (G1) 0.1% by mass, and (H1) 0.4% by mass were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by mass of (C1) was added and the mixture was melt-mixed for 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 2.

[0137] [Example 21] The raw materials (A1-1) 20% by weight, (B1 + D1) 80% by weight, (E1) 3% by weight, (F4) 0.1% by weight, (G1) 0.1% by weight, and (H1) 0.4% by weight) were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by weight of (C1) was added and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 3.

[0138] [Example 22] The raw materials (A1-1) 20% by weight, (B1 + D1) 80% by weight, (E1) 3% by weight, (F1) 0.1% by weight, (G1) 0.1% by weight, and (H1) 0.4% by weight) were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by weight of (C5) was added, and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 3.

[0139] [Example 23] The raw materials (A1-1) 20% by weight, (B1 + D1) 80% by weight, (E1) 3% by weight, (F1) 0.1% by weight, (G1) 0.1% by weight, and (H1) 0.4% by weight) were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by weight of (C6) was added and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine as in Comparative Example 1, and the molded body was sandwiched between paper sheets and stored. Antibacterial and antifouling tests were then conducted. The results are shown in Table 3.

[0140] [Example 24] A thermoplastic resin composition was obtained by melt-kneading raw materials (80% by mass of (A1-1), 20% by mass of (B4), 2% by mass of (C1), 0.1% by mass of (F1), and 0.1% by mass of (G1)) in a Labo Plastomill under conditions of a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a kneading time of 8 minutes. The thermoplastic composition was molded in a compression molding machine in the same manner as in Comparative Example 1, except that the temperature of the compression molding machine was set to 220°C. The molded body was stored sandwiched between paper sheets, and then subjected to antibacterial and antifouling tests. The results are shown in Table 3.

[0141] Comparative Example 3 A thermoplastic resin composition was obtained by melt-kneading 100% by mass of (A1-1) and 2% by mass of (C1) as raw materials in a 100cc Laboplastomill (manufactured by Toyo Seiki Seisakusho) under conditions of a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a kneading time of 8 minutes. The blending amounts of each component used in the raw materials are shown in Table 1. The thermoplastic composition was molded in a compression molding machine in the same manner as in Comparative Example 1, except that the temperature of the compression molding machine was set to 220°C. The molded body was stored sandwiched between paper sheets, and then subjected to antibacterial and antifouling tests. The results are shown in Table 3.

[0142] Comparative Example 4 A thermoplastic resin composition was obtained by melt-kneading 95% by mass of (A1-1), 5% by mass of (D1), and 2% by mass of (C1) in a 100cc Labo Plastomill (manufactured by Toyo Seiki Seisakusho) at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a kneading time of 8 minutes. The blending amounts of each component used in the raw materials are shown in Table 1. The thermoplastic composition was molded in a compression molding machine in the same manner as in Comparative Example 1, except that the temperature of the compression molding machine was set to 220°C. The molded body was stored sandwiched between paper sheets, and then subjected to antibacterial and antifouling tests. The results are shown in Table 3.

[0143] Comparative Example 5 The raw materials (A1-1) 20% by mass, (B1+D1) 80% by mass, (E1) 3% by mass, and (H1) 0.4% by mass were mixed in a Labo Plastomill at a rotor temperature of 190±10°C, a rotation speed of 80 rpm, and a mixing time of 4 minutes. Then, 2% by mass of (C4) was added, and the mixture was melt-mixed for an additional 5 minutes to obtain a thermoplastic resin composition. The thermoplastic composition was molded in a compression molding machine in the same manner as in Comparative Example 1. The molded body was sandwiched between paper sheets and stored, after which antibacterial and antifouling tests were conducted. The results are shown in Table 3.

[0144] [Table 1]

[0145] [Table 2]

[0146] [Table 3]

[0147] As can be seen from the results in Tables 1 to 3, the molded articles obtained from the thermoplastic resin compositions of the examples that satisfy all of the constituent requirements of the present invention have antifouling properties and good antibacterial activity against Staphylococcus aureus and Escherichia coli.

Claims

1. 5 to 95 parts by mass of a propylene resin (A); 5 to 95 parts by mass of at least one selected from the group consisting of an ethylene copolymer rubber (B) and a copolymer (B') containing a monomer unit derived from an aromatic vinyl compound and a monomer unit derived from a conjugated diene compound (wherein the total amount of the propylene resin (A), the ethylene copolymer rubber (B), and the copolymer (B') is taken as 100 parts by mass); A glycerin fatty acid ester (C), (C) is an ester of a fatty acid having 8 to 14 carbon atoms; The thermoplastic resin composition further contains a crosslinking agent (E).

2. The propylene resin (A) is at least one selected from the group consisting of a propylene homopolymer, a heterophasic polymer material, and a propylene random copolymer; The content of the propylene resin (A) is A parts by mass, the content of the ethylene copolymer rubber (B) is B parts by mass, the content of the copolymer (B') is B' parts by mass, the content of the propylene homopolymer is A1 parts by mass, the content of the heterophasic polymerization material is A2 parts by mass, and A+B+B' is 100 parts by mass, 2. The thermoplastic resin composition according to claim 1, wherein (B+B') / (A1+A2+B+B') is 0.51 to 1.

0.

3. The thermoplastic resin composition according to claim 1 or 2, further comprising a mineral oil (D).

4. 4. The thermoplastic resin composition according to claim 3, wherein the content of (D) is 0.1% by mass or more and 60% by mass or less, where the total amount of the propylene resin (A), the ethylene copolymer rubber (B), the copolymer (B'), and the mineral oil (D) is 100% by mass.

5. The thermoplastic resin composition according to any one of claims 1 to 4, further comprising an antioxidant (G).

6. The thermoplastic resin composition according to any one of claims 1 to 5, further comprising a lubricant (F).

7. The thermoplastic resin composition according to claim 6, wherein (F) is a fatty acid amide.

8. The thermoplastic resin composition according to any one of claims 1 to 7, wherein the content of (C) is 0.1% by mass or more and 10% by mass or less, where the total amount of the propylene resin (A), the ethylene copolymer rubber (B), the copolymer (B'), and the mineral oil (D) is 100% by mass.

9. The thermoplastic resin composition according to any one of claims 1 to 8, wherein (C) is a diglycerin fatty acid ester.

10. The thermoplastic resin composition according to claim 9, wherein (C) is a diglycerin mono-fatty acid ester.

11. A molded article comprising the thermoplastic resin composition according to any one of claims 1 to 10.

Images