JP5765520B2 - 磁性粒子含有水分散体の製造方法 - Google Patents
磁性粒子含有水分散体の製造方法 Download PDFInfo
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- JP5765520B2 JP5765520B2 JP2010259432A JP2010259432A JP5765520B2 JP 5765520 B2 JP5765520 B2 JP 5765520B2 JP 2010259432 A JP2010259432 A JP 2010259432A JP 2010259432 A JP2010259432 A JP 2010259432A JP 5765520 B2 JP5765520 B2 JP 5765520B2
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- Prior art keywords
- magnetic
- particles
- aqueous dispersion
- iron oxide
- particle
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- 239000006249 magnetic particle Substances 0.000 title claims description 58
- 239000006185 dispersion Substances 0.000 title claims description 56
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 118
- 230000005291 magnetic effect Effects 0.000 claims description 73
- 239000002245 particle Substances 0.000 claims description 72
- 239000010419 fine particle Substances 0.000 claims description 50
- 239000007864 aqueous solution Substances 0.000 claims description 40
- 238000006243 chemical reaction Methods 0.000 claims description 36
- 229920000642 polymer Polymers 0.000 claims description 29
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 239000000243 solution Substances 0.000 claims description 18
- 239000011163 secondary particle Substances 0.000 claims description 16
- 229920002125 Sokalan® Polymers 0.000 claims description 15
- 239000004584 polyacrylic acid Substances 0.000 claims description 15
- 239000011164 primary particle Substances 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000006228 supernatant Substances 0.000 claims description 11
- 238000000502 dialysis Methods 0.000 claims description 6
- 150000002505 iron Chemical class 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- 239000012266 salt solution Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 16
- 230000005415 magnetization Effects 0.000 description 14
- 239000000843 powder Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 230000002776 aggregation Effects 0.000 description 9
- 238000004220 aggregation Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- 239000003814 drug Substances 0.000 description 7
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 7
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 239000000084 colloidal system Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000008186 active pharmaceutical agent Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 238000002296 dynamic light scattering Methods 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 229910052596 spinel Inorganic materials 0.000 description 5
- 239000011029 spinel Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 4
- 239000008280 blood Substances 0.000 description 4
- 210000004369 blood Anatomy 0.000 description 4
- 238000000975 co-precipitation Methods 0.000 description 4
- 238000002591 computed tomography Methods 0.000 description 4
- 229940088679 drug related substance Drugs 0.000 description 4
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 238000000015 thermotherapy Methods 0.000 description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 3
- 229940079593 drug Drugs 0.000 description 3
- 238000012377 drug delivery Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229960002089 ferrous chloride Drugs 0.000 description 3
- 150000004676 glycans Chemical class 0.000 description 3
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 3
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 150000003904 phospholipids Chemical class 0.000 description 3
- 229920001282 polysaccharide Polymers 0.000 description 3
- 239000005017 polysaccharide Substances 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- 229920001353 Dextrin Polymers 0.000 description 2
- 239000004375 Dextrin Substances 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000010908 decantation Methods 0.000 description 2
- 235000019425 dextrin Nutrition 0.000 description 2
- 230000029142 excretion Effects 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- 238000004108 freeze drying Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- WTFXARWRTYJXII-UHFFFAOYSA-N iron(2+);iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+2].[Fe+3].[Fe+3] WTFXARWRTYJXII-UHFFFAOYSA-N 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 235000011118 potassium hydroxide Nutrition 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 206010020751 Hypersensitivity Diseases 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229920001795 coordination polymer Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000012869 ethanol precipitation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052598 goethite Inorganic materials 0.000 description 1
- 239000011361 granulated particle Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000825 pharmaceutical preparation Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000008279 sol Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 125000001174 sulfone group Chemical group 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 230000036326 tumor accumulation Effects 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/22—Compounds of iron
- C09C1/24—Oxides of iron
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- A61K41/0052—Thermotherapy; Hyperthermia; Magnetic induction; Induction heating therapy
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- A61K49/1818—Nuclear magnetic resonance [NMR] contrast preparations; Magnetic resonance imaging [MRI] contrast preparations characterised by a special physical form, e.g. emulsions, microcapsules, liposomes particles, e.g. uncoated or non-functionalised microparticles or nanoparticles
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
- C01G49/0036—Mixed oxides or hydroxides containing one alkaline earth metal, magnesium or lead
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- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/08—Ferroso-ferric oxide [Fe3O4]
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01—INORGANIC CHEMISTRY
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- C01P2006/42—Magnetic properties
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- Nanotechnology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- Epidemiology (AREA)
- Organic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Pharmacology & Pharmacy (AREA)
- Bioinformatics & Cheminformatics (AREA)
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Description
また、微細な磁性粒子は製薬造粒工程において、微粒子の集合状態を調製することにより造粒粒子に強磁性体の機能を付与することができる。
また、超微粒子であることで投与後は体内からの排泄を容易にすることができる。
本発明者は、鋭意研究を重ねた結果、磁性粒子の表面がカルボキシル基を有するポリマーで被覆された超常磁性酸化鉄微粒子からなる磁性粒子含有水分散体の分散安定条件を見出した。
撹拌装置及び加熱装置を備えた1000mlの反応容器を用い、原料鉄塩と苛性ソーダは試薬特級を用い、また水はイオン交換水を用いた。
分子量5000のポリアクリル酸7.83gとイオン交換水713.2mlを反応容器に入れ、窒素ガスを吹き込み、そのまま95℃まで昇温させる。次に、1.6mmol/lの硫酸第一鉄水溶液10mlと、3.2mmol/lの塩化第二鉄水溶液10mlを反応容器に投入し(COOH/Fe比率=2.27)、さらに14.8mmol/lのアンモニア水59.4mlを添加し、2時間撹拌して反応させる。水溶液を65℃まで冷却させる。反応液をエバポレーターにて、約100mlまで濃縮する。室温まで冷却した後、濃縮液をビーカーに移し、スターラー攪拌しながら沈殿が生じるまでほぼ等量のエタノールを添加する。上澄みを捨て、全量が100g程度になるようにイオン交換水を添加し、攪拌しながら分散させる。再度、エタノールを等量添加し、1000rpm、10分間遠心分離機で処理を行なう。上澄み液を除去し、再度、この操作を繰り返し、最終的に得られた沈殿物をイオン交換水で分散させる。さらにエバポレーターで40g程度に濃縮する。
ここに得たコロイド水溶液の一部を採取し、水洗ろ過したペーストを凍結乾燥して得られた粉末を分析した結果、BET比表面積が230m2/g、TEMによる一次粒子の平均粒子径が5nm、動的光散乱法による二次粒子の平均粒子径が17.3nmであった。また、磁気特性は飽和磁化値σsが13Am2/kg、保磁力Hcが0.35kA/mの磁性酸化鉄微粒子であった。
透析膜を使用して精製を行なった。得られた透析液をエバポレーターで200mlに濃縮し、12000G、30分間遠心分離を行い、上澄み液を回収する。この操作で凝集粒子は除去される。このようにして、黒色のコロイド水溶液を精製した。
分子量が1800のポリアクリル酸を用いた以外は、実施例1と同様に反応を行い、コロイド溶液を得た。同様に粉末を分析した結果、BET比表面積が165m2/g、TEMによる一次粒子の平均粒子径が7nm、動的光散乱法による二次粒子の平均粒子径が56nmであった。また、磁気特性は飽和磁化値σsが32Am2/kg、保磁力Hcが0.65kA/mの磁性酸化鉄微粒子であった。
1000mlフラスコに、13.9mol/lのNaOH水溶液60gとイオン交換水530gを混合し予め80℃に加温した水溶液に、0.8mmol/lの塩化第一鉄水溶液108.4gと2.5mmol/lの塩化第二鉄水溶液80gを混合して添加した。次に、分子量5000のポリアクリル酸12.1gを溶解した水溶液60gを添加し、1時間同温度で反応させた後、イオン交換水を添加してデカンテーションで上澄み液を除去した。この操作を繰り返し、水に可溶している塩類を除去した。
このようにして得られた磁性粒子含有分散体の一部を採取し、水洗ろ過したペーストを凍結乾燥して得られた粉末を分析した結果、BET比表面積が176m2/g、TEMによる一次粒子の平均粒子径が8nm、動的光散乱法による二次粒子の平均粒子径が120nmであり、明らかに凝集したものであった。また、磁気特性は、飽和磁化値σsが26.3Am2/kg、保磁力が0.92kA/mであった。
300mlフラスコに、0.1mol/lの塩化第一鉄水溶液50mlを調製し、そこに分子量1800のポリアクリル酸0.09gを添加した。次に、0.7mol/lのKOH水溶液11mlを添加して、水酸化鉄の沈殿物を生じさせた。次に、過酸化水素0.035mlを含む水溶液50mlを、33ml/hの速度で添加した。2時間反応させた後、イオン交換水を添加してデカンテーションを繰り返し、水に可溶している塩類を除去した。
このようにして得られた磁性粒子含有分散体の一部を採取し、水洗ろ過したペーストを凍結乾燥して得られた粉末を分析した結果、BET比表面積が176m2/gであり、一方、TEMによって一次粒子の平均粒子径が10〜50nmの球状粒子と多数の針状粒子の混合物が観察され、動的光散乱法による二次粒子の平均粒子径が120nmであり、明らかに凝集したものであった。また、磁気特性は、飽和磁化値σsが26.3Am2/kg、保磁力が0.92kA/mであった。
Claims (4)
- 磁性粒子含有水分散体の製造であって、窒素雰囲気下においてカルボキシル基を有するポリマーを溶解した水溶液を90〜100℃に昇温し、2価および3価の鉄塩溶液とアルカリ溶液とを添加し同温度で反応を行い、室温まで冷却した後、エタノール添加による沈殿後、上澄み液の除去および水への分散、透析により、カルボキシル基を含有するポリマーで被覆された磁性酸化鉄微粒子の水分散体を得るものであり、得られる磁性粒子含有水分散体は、磁性酸化鉄微粒子を水に分散させた磁性粒子含有水分散体であって、磁性酸化鉄微粒子の一次粒子の平均粒子径が5〜15nm、分散体のpHが6.5のときの二次粒子の平均粒子径が10〜60nmであり、当該粒子表面がカルボキシル基を有するポリマーで被覆されていることを特徴とする磁性粒子含有水分散体の製造方法。
- 得られる磁性粒子含有水分散体は、pH6〜8の範囲におけるゼータ電位が−20mV以下である請求項1記載の磁性粒子含有水分散体の製造方法。
- 得られる磁性粒子含有水分散体は、カルボキシル基を有するポリマーが分子量1500〜10000のポリアクリル酸である請求項1又は2に記載の磁性粒子含有水分散体の製造方法。
- 請求項1〜3のいずれかに記載の磁性粒子含有水分散体の製造方法において、反応時における全鉄Feに対するカルボキシル基COOHのモル比率(COOH/Fe)が、0.3〜3である磁性粒子含有水分散体の製造方法。
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