JP7048618B2 - 熱可塑性樹脂組成物 - Google Patents
熱可塑性樹脂組成物 Download PDFInfo
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- JP7048618B2 JP7048618B2 JP2019533067A JP2019533067A JP7048618B2 JP 7048618 B2 JP7048618 B2 JP 7048618B2 JP 2019533067 A JP2019533067 A JP 2019533067A JP 2019533067 A JP2019533067 A JP 2019533067A JP 7048618 B2 JP7048618 B2 JP 7048618B2
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- 229920005992 thermoplastic resin Polymers 0.000 title claims description 68
- 239000011342 resin composition Substances 0.000 title claims description 55
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 64
- 229920002554 vinyl polymer Polymers 0.000 claims description 59
- 229920001577 copolymer Polymers 0.000 claims description 32
- 239000011787 zinc oxide Substances 0.000 claims description 31
- 230000000844 anti-bacterial effect Effects 0.000 claims description 30
- 229920006026 co-polymeric resin Polymers 0.000 claims description 29
- 238000012360 testing method Methods 0.000 claims description 22
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 15
- 229920000578 graft copolymer Polymers 0.000 claims description 14
- 241000894006 Bacteria Species 0.000 claims description 10
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 241000191967 Staphylococcus aureus Species 0.000 claims description 8
- 238000002441 X-ray diffraction Methods 0.000 claims description 8
- 238000012258 culturing Methods 0.000 claims description 8
- 241000588724 Escherichia coli Species 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 claims description 5
- 238000005424 photoluminescence Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000178 monomer Substances 0.000 description 35
- 238000000034 method Methods 0.000 description 15
- 229920001971 elastomer Polymers 0.000 description 12
- 238000000465 moulding Methods 0.000 description 9
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 8
- 239000003063 flame retardant Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000006116 polymerization reaction Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 6
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- -1 p. -T-Butylstyrene Chemical compound 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 239000005060 rubber Substances 0.000 description 6
- 239000008188 pellet Substances 0.000 description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 5
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- KYPOHTVBFVELTG-OWOJBTEDSA-N (e)-but-2-enedinitrile Chemical compound N#C\C=C\C#N KYPOHTVBFVELTG-OWOJBTEDSA-N 0.000 description 3
- OYUNTGBISCIYPW-UHFFFAOYSA-N 2-chloroprop-2-enenitrile Chemical compound ClC(=C)C#N OYUNTGBISCIYPW-UHFFFAOYSA-N 0.000 description 3
- RLFXJQPKMZNLMP-UHFFFAOYSA-N 2-phenylprop-2-enenitrile Chemical compound N#CC(=C)C1=CC=CC=C1 RLFXJQPKMZNLMP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- GYCMBHHDWRMZGG-UHFFFAOYSA-N Methylacrylonitrile Chemical compound CC(=C)C#N GYCMBHHDWRMZGG-UHFFFAOYSA-N 0.000 description 3
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 150000001993 dienes Chemical class 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 230000000704 physical effect Effects 0.000 description 3
- WAEOXIOXMKNFLQ-UHFFFAOYSA-N 1-methyl-4-prop-2-enylbenzene Chemical group CC1=CC=C(CC=C)C=C1 WAEOXIOXMKNFLQ-UHFFFAOYSA-N 0.000 description 2
- CYLVUSZHVURAOY-UHFFFAOYSA-N 2,2-dibromoethenylbenzene Chemical compound BrC(Br)=CC1=CC=CC=C1 CYLVUSZHVURAOY-UHFFFAOYSA-N 0.000 description 2
- CISIJYCKDJSTMX-UHFFFAOYSA-N 2,2-dichloroethenylbenzene Chemical compound ClC(Cl)=CC1=CC=CC=C1 CISIJYCKDJSTMX-UHFFFAOYSA-N 0.000 description 2
- SBYMUDUGTIKLCR-UHFFFAOYSA-N 2-chloroethenylbenzene Chemical compound ClC=CC1=CC=CC=C1 SBYMUDUGTIKLCR-UHFFFAOYSA-N 0.000 description 2
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- 229920006164 aromatic vinyl copolymer Polymers 0.000 description 2
- 238000012662 bulk polymerization Methods 0.000 description 2
- MPMBRWOOISTHJV-UHFFFAOYSA-N but-1-enylbenzene Chemical compound CCC=CC1=CC=CC=C1 MPMBRWOOISTHJV-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000007720 emulsion polymerization reaction Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000010557 suspension polymerization reaction Methods 0.000 description 2
- IGGDKDTUCAWDAN-UHFFFAOYSA-N 1-vinylnaphthalene Chemical compound C1=CC=C2C(C=C)=CC=CC2=C1 IGGDKDTUCAWDAN-UHFFFAOYSA-N 0.000 description 1
- 238000010146 3D printing Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 244000063299 Bacillus subtilis Species 0.000 description 1
- 235000014469 Bacillus subtilis Nutrition 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 101100075513 Oryza sativa subsp. japonica LSI3 gene Proteins 0.000 description 1
- 241000589517 Pseudomonas aeruginosa Species 0.000 description 1
- 241000607142 Salmonella Species 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 235000009754 Vitis X bourquina Nutrition 0.000 description 1
- 235000012333 Vitis X labruscana Nutrition 0.000 description 1
- 240000006365 Vitis vinifera Species 0.000 description 1
- 235000014787 Vitis vinifera Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229920000800 acrylic rubber Polymers 0.000 description 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000005907 alkyl ester group Chemical group 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002017 high-resolution X-ray diffraction Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920006027 ternary co-polymer Polymers 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
- C08L25/12—Copolymers of styrene with unsaturated nitriles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F12/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/22—Compounds containing nitrogen bound to another nitrogen atom
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/16—Homopolymers or copolymers of alkyl-substituted styrenes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
- C08F2500/12—Melt flow index or melt flow ratio
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
本発明の熱可塑性樹脂は、(A1)ゴム変性芳香族ビニル系グラフト共重合体;(A2)ASTM D 1238基準によって測定された流動指数が約5g/10min~約8g/10minの芳香族ビニル系共重合体樹脂;および(A3)α-メチルスチレン共重合体を含む。
本発明の一具体例にかかるゴム変性芳香族ビニル系グラフト共重合体としては、ゴム質重合体に芳香族ビニル系単量体および前記芳香族ビニル系単量体と共重合可能な単量体がグラフト共重合されたものを使用することができる。
本発明の芳香族ビニル系共重合体樹脂は、ASTM D 1238基準に基づいてGottfert MI-3によって測定された流動指数が約5g/10min~約8g/10min、具体的には約5g/10min~約7.5g/10min、例えば、5g/10min、5.5g/10min、6g/10min、6.5g/10min、7g/10min、7.5g/10minの高流動芳香族ビニル系共重合体樹脂が適用される。もし、流動指数が約8g/10minを超える芳香族ビニル系共重合体樹脂を適用する場合、耐クリープ性が低下するという欠点があり、流動指数が約5g/10min未満の芳香族ビニル系共重合体樹脂を適用する場合は、射出成形性が低下するという欠点がある。
本発明のα-メチルスチレン共重合体は、α-メチルスチレンおよびα-メチルスチレンと共重合可能な単量体を含む単量体混合物の重合体であり得る。
本発明で使用される酸化亜鉛は、フォトルミネッセンス(Photo Luminescence)測定時、370nm~390nm領域のピークAと450nm~600nm領域のピークBとの強度比(B/A)が、約0.01~約1、具体的には約0.01~約0.5、好ましくは約0.01~約0.1、例えば、0.01、0.02、0.03、0.04、0.05、0.06、0.07、0.08、0.09、0.1であり、窒素ガス吸着法を用いて、BET分析装置で測定したBET表面積が約10m2/g以下、具体的には約1m2/g~約7m2/g、例えば、1m2/g、2m2/g、3m2/g、4m2/g、5m2/g、6m2/g、7m2/gであるものを使用する。もし、上記酸化亜鉛の強度比(B/A)が約0.01未満の場合は、抗菌性が低下し得、約1を超える場合は耐変色性、低臭性および耐クリープ性を確保することができない。また、BET表面積が約10m2/gを超える酸化亜鉛を適用する場合は、本発明の目的とする低臭性および耐クリープ性を確保することができない。
(A)熱可塑性樹脂
(A1)ゴム変性芳香族ビニル系グラフト共重合体
45重量%のZ-平均が310nmのブタジエンゴムに、55重量%のスチレンおよびアクリロニトリル(重量比:75/25)がグラフト共重合されたg-ABSを使用した。
ASTM D 1238基準に基づいて、Gottfert MI-3によって測定された流動指数が7g/10minであり、アクリロニトリル含有量が30重量%であり、重量平均分子量が100,000g/molであるSAN共重合体を使用した。
アクリロニトリル含有量が30重量%であり、重量平均分子量が150,000g/molであるAMS-SAN共重合体を使用した。
ASTM D 1238基準に基づいて、Gottfert MI-3によって測定された流動指数が2g/10minであり、アクリロニトリル含有量が30重量%であり、重量平均分子量が100,000g/molであるSAN共重合体を使用した。
下記表1の酸化亜鉛を使用した。なお、(B1)は、品番KS-1、PJ ChemTek社製の酸化亜鉛であり、(B2)は、品番RZ-950、Ristecbiz社製の酸化亜鉛である。
(1)平均粒子径(単位:μm):粒度分析装置(Beckman Coulter社のLaser Diffraction Particle Size Analyzer LSI3 320の機器)を使用して、平均粒子径(体積平均)を測定した。
上記の各構成成分を下記表2および3に記載したような含有量で添加した後、230℃で押出してペレットを製造した。押出は、L/D=36、直径45mmの二軸押出機を使用し、製造されたペレットは80℃で4時間以上乾燥した後、6Oz射出成形機(成形温度250℃,金型温度:60℃)で射出して試験片を製造した。製造された試験片について、下記の方法で物性を評価し、その結果を下記表2に示した。
(1)抗菌活性値:JIS Z 2801抗菌評価法に従い、5cm×5cmの大きさの試験片に黄色ブドウ状球菌および大腸菌を接種し、下記数式3に基づいて抗菌活性値を求めた。
抗菌活性値=log(M1/M2)
(上記数式3において、M1はブランク(blank)試片に対する35℃、RH90%の条件で24時間培養した後の細菌数であり、M2は熱可塑性樹脂組成物試片に対する35℃、RH90%の条件で24時間培養した後の細菌数である。)
(2)衝撃強度(単位:kgfcm/cm):1/8”厚でASTMD256に基づいてINSTRON装置を使用して測定した。
Claims (10)
- (A)(A1)ゴム変性芳香族ビニル系グラフト共重合体;(A2)ASTM D 1238基準によって測定された流動指数が約5g/10min~約8g/10minの芳香族ビニル系共重合体樹脂;および(A3)α-メチルスチレン共重合体を含む熱可塑性樹脂100重量部;
(B)酸化亜鉛約0.1重量部~約10重量部;を含み、
前記酸化亜鉛はフォトルミネッセンス(Photo Luminescence)測定時、370nm~390nm領域のピークAと450nm~600nm領域のピークBとの強度比(B/A)が約0.01~約1であり、BET分析装置で測定したBET表面積が約10m2/g以下である、熱可塑性樹脂組成物であって、
前記酸化亜鉛は、平均粒子径(D50)が約0.2μm~約3μmであり、
前記酸化亜鉛は、X線回折(X-ray diffraction,XRD)分析時、ピーク位置(peak position)2θ値が約35°~約37°の範囲であり、下記数式2による微結晶サイズ(crystallite size)の値が約1,000Å~約2,000Åであり、
上記数式2において、Kは形状係数(shape factor)であり、λはX線波長(X-ray wavelength)であり、βはX線回折ピーク(peak)のFWHM値(degree)であり、θはピーク位置値(peak position degree)であり、
前記酸化亜鉛は、フォトルミネッセンス(Photo Luminescence)測定時、370nm~390nm領域のピークAと450nm~600nm領域のピークBとの強度比(B/A)が約0.01~約0.5である、熱可塑性樹脂組成物。 - 前記(A2)芳香族ビニル系共重合体樹脂は、重量平均分子量が約85,000g/mol~約150,000g/molである、請求項1に記載の熱可塑性樹脂組成物。
- 前記(A3)α-メチルスチレン共重合体は、α-メチルスチレン約65重量%~約80重量%およびアクリロニトリル約20重量%~約35重量%の共重合体である、請求項1または2に記載の熱可塑性樹脂組成物。
- 前記(A3)α-メチルスチレン共重合体は、重量平均分子量が約130,000g/mol~約180,000g/molである、請求項1~3のいずれか1項に記載の熱可塑性樹脂組成物。
- 前記(A2)芳香族ビニル系共重合体樹脂と前記(A3)α-メチルスチレン共重合体との重量比((A2):(A3))は、約5:1~約15:1である、請求項1~5のいずれか1項に記載の熱可塑性樹脂組成物。
- 前記熱可塑性樹脂(A)は、(A1)ゴム変性芳香族ビニル系グラフト共重合体約20重量%~約45重量%;(A2)芳香族ビニル系共重合体樹脂約40重量%~約75重量%;および(A3)α-メチルスチレン共重合体約3重量%~約15重量%を含む、請求項1~6のいずれか1項に記載の熱可塑性樹脂組成物。
- 前記(A3)α-メチルスチレン共重合体と前記(B)酸化亜鉛との重量比は、約1.5:1~約15:1である、請求項1~7のいずれか1項に記載の熱可塑性樹脂組成物。
- 前記熱可塑性樹脂組成物は、120℃で5時間の残留揮発成分(TVOC)が約1780Area/g以下であり、
1/8”厚でASTMD256による衝撃強度が約18kgfcm/cm以上であり、
JIS Z 2801抗菌評価法によって、5cm×5cmの大きさの試験片に黄色ブドウ状球菌および大腸菌を接種し、下記数式3に基づいて算出した黄色ブドウ状球菌に対する抗菌活性値が約2.0~約7.0であり、大腸菌に対する抗菌活性値が約2.0~約7.5である、請求項1~8のいずれか1項に記載の熱可塑性樹脂組成物:
前記数式3において、M1はブランク(blank)試験片に対する35℃、RH90%の条件で24時間培養した後の細菌数であり、M2は熱可塑性樹脂組成物試験片に対する35℃、RH90%の条件で24時間培養した後の細菌数である。 - 請求項1~9のいずれか1項に記載の熱可塑性樹脂組成物から形成された成形品。
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