JP2001028308A5 - - Google Patents
Download PDFInfo
- Publication number
- JP2001028308A5 JP2001028308A5 JP1999201658A JP20165899A JP2001028308A5 JP 2001028308 A5 JP2001028308 A5 JP 2001028308A5 JP 1999201658 A JP1999201658 A JP 1999201658A JP 20165899 A JP20165899 A JP 20165899A JP 2001028308 A5 JP2001028308 A5 JP 2001028308A5
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- aqueous
- ultrafine particles
- dispersion according
- copolymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000011882 ultra-fine particle Substances 0.000 claims description 13
- 239000006185 dispersion Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 6
- 230000009477 glass transition Effects 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 239000007900 aqueous suspension Substances 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Description
さらに、非晶質の磁性超微粒子は磁化量を持つことはできても保磁力を持つことはできないので、磁気記録を行うことが不可能となり、限られた用途にしか用いることができない。結晶質の磁性超微粒子は、粒径や種類によって磁化量や保磁力をコントロールすることが可能となる。このような結晶質の磁性超微粒子の分散において、本発明は特に有効である。
Further, since amorphous magnetic ultrafine particles can have a magnetization amount but not a coercive force , magnetic recording becomes impossible and can be used only for a limited purpose. The amount of magnetization and coercive force of crystalline magnetic ultrafine particles can be controlled by the particle size and type. The present invention is particularly effective in dispersing such crystalline magnetic ultrafine particles.
本発明の磁性超微粒子では、粒径が５０ｎｍ以下であることが重要である。磁性超微粒子の粒径が５０ｎｍ以上の場合には、元々磁性超微粒子の比重が大きいので、粒子が沈降しやすくなり、保存安定性の高い分散体を得ることはできない。また保磁力が１０００Ｏｅ以下であることが望ましい。これより高いと、クレジットカードなどのリーダライターでの磁気記録・再生が極めて困難になる。
In the magnetic ultrafine particles of the present invention, it is important that the particle size is 50 nm or less. When the particle size of the magnetic ultrafine particles is 50 nm or more, the specific gravity of the magnetic ultrafine particles is originally large, so that the particles tend to settle and a dispersion having high storage stability cannot be obtained. Further, it is desirable that the coercive force is 1000 Oe or less. If it is higher than this, magnetic recording / reproduction with a reader / writer such as a credit card becomes extremely difficult.
本発明の水性磁性分散体を用いて作製される水性磁性インクをインクジェットプリンタで印字する場合に、磁場を印加しながら印字して磁性超微粒子を配向させることによって角形比（Ｂｒ／Ｂｓ）を大きくすることができ、これにより、再生出力に直接影響する残留磁束密度を大きくすることが可能となる。つまり、通常の磁気記録にも使用可能な、磁気ヘッドによる再生出力の大きな磁気印刷物を、インクジェットプリンタで作製することが可能となる。この場合、水性磁性分散体に使用したスチレンとアクリル酸を含む共重合体のガラス転移点が１００℃より高い場合は、印字物の粘度が高くなるため十分な効果が得られない。角形比（Ｂｒ／Ｂｓ）は、磁場配向時に印加する磁場の強度は、用いる磁性超微粒子や用途などによって異なるが、５００から１５０００エルステッドが望ましい。また、磁場は永久磁石、ソレノイド磁石などどのような磁石を用いて発生させても良い。磁場の印加方向は、用途などに応じて、印字する方向（長手方向）に対して平行方向、垂直方向あるいは斜め方向などいずれの方向でも良い。
When printing a water-based magnetic ink produced using the water-based magnetic dispersion of the present invention with an inkjet printer, the square ratio (Br / Bs) is increased by printing while applying a magnetic field to orient the magnetic ultrafine particles. This makes it possible to increase the residual magnetic flux density that directly affects the reproduction output. That is, it is possible to produce a magnetic printed matter having a large reproduction output by a magnetic head, which can be used for ordinary magnetic recording, with an inkjet printer. In this case, if the glass transition point of the copolymer containing styrene and acrylic acid used in the aqueous magnetic dispersion is higher than 100 ° C., the viscosity of the printed matter becomes high, so that a sufficient effect cannot be obtained. The square ratio (Br / Bs) is preferably 500 to 15000 oersted, although the strength of the magnetic field applied at the time of magnetic field orientation varies depending on the magnetic ultrafine particles used and the application. Further, the magnetic field may be generated by using any magnet such as a permanent magnet or a solenoid magnet. The direction in which the magnetic field is applied may be any direction such as a parallel direction, a vertical direction, or an oblique direction with respect to the printing direction (longitudinal direction), depending on the application and the like.
（実施例１）粒径が２０ｎｍで、磁気特性が保磁力７４０エルステッド、飽和磁化率６５ｅｍｕ／ｇであるコバルトフェライト超微粒子の濃度が２２０ｇ／ｌ水懸濁液１００重量部に、スチレンおよびアクリル酸の組成比が８０：２０である分子量１００００、ガラス転移点９９℃の共重合体５重量部とポリエチレンオキサイドと芳香環を含む両親媒性化合物（三洋化成製 商品名：ノニポール４００）４重量部を混合し粒径０．３mmのジルコニアビーズを使ってサンドミルで２時間分散して水性磁性分散体を得た。
(Example 1) particle size 20 nm, magnetic properties coercivity 740 oersteds, the concentration of 220 g / l aqueous suspension 100 parts by weight of cobalt ferrite nanoparticles are saturation magnetization ratio 65 emu / g, styrene and acrylic acid 5 parts by weight of a copolymer having a composition ratio of 80:20 and a glass transition point of 99 ° C., and 4 parts by weight of an amphoteric compound containing polyethylene oxide and an aromatic ring (trade name: Nonipol 400 manufactured by Sanyo Kasei). The mixture was mixed and dispersed in a sand mill for 2 hours using zirconia beads having a particle size of 0.3 mm to obtain an aqueous magnetic dispersion.
表１
┌────┬─────┬─────┬───┬───┬─────────┐
│ │保存安定性│目詰まり │角形比│耐擦性│ガラス転移点（℃）│
├────┼─────┼─────┼───┼───┼─────────┤
│ │ │ │ │ │ │
│実施例１│ ○ │ ○ │ 0.45 │ ○ │ ９９ │
│ │ │ │ │ │ │
│実施例２│ ○ │ ○ │ 0.47 │ ○ │ ５２ │
│ │ │ │ │ │ │
│実施例３│ ○ │ ○ │ 0.49 │ ○ │ １６ │
│ │ │ │ │ │ │
│実施例４│ ○ │ ○ │ 0.49 │ ○ │ −８ │
│ │ │ │ │ │ │
├────┼─────┼─────┼───┼───┼─────────┤
│ │ │ │ │ │ │
│比較例１│ △ │ ○ │ 0.46 │ × │ −２０ │
│ │ │ │ │ │ │
│比較例２│ △ │ × │ 0.44 │ ○ │ １２０ │
│ │ │ │ │ │ │
│比較例３│ × │ × │ 0.32 │ × │ − │
│ │ │ │ │ │ │
└────┴─────┴─────┴───┴───┴─────────┘
Table 1
┌────┬─────┬─────┬───┬───┬─────────┐
│ │ Storage stability │ Clog │ Square ratio │ Abrasion resistance │ Glass transition point (℃) │
├────┼─────┼─────┼───┼───┼─────────┤
│ │ │ │ │ │ │ │
│ Example 1 │ ○ │ ○ │ 0.45 │ ○ │ 99 │
│ │ │ │ │ │ │ │
│ Example 2 │ ○ │ ○ │ 0.47 │ ○ │ 52 │
│ │ │ │ │ │ │ │
│ Example 3 │ ○ │ ○ │ 0.49 │ ○ │ 16 │
│ │ │ │ │ │ │ │
│ Example 4 │ ○ │ ○ │ 0.49 │ ○ │ -8 │
│ │ │ │ │ │ │ │
├────┼─────┼─────┼───┼───┼─────────┤
│ │ │ │ │ │ │ │
│ Comparative example 1 │ △ │ ○ │ 0.46 │ × │ -20 │
│ │ │ │ │ │ │ │
│ Comparative example 2 │ △ │ × │ 0.44 │ ○ │ 120 │
│ │ │ │ │ │ │ │
│ Comparative example 3 │ × │ × │ 0.32 │ × │ − │
│ │ │ │ │ │ │ │
└────┴─────┴─────┴───┴───┴─────────┘
また角形比（Ｂｒ／Ｂｍ）は、作製した水性磁性インクを用いて、印字する媒体に対して水平方向、印字方向に対して平行方向に３０００エルステッドの磁場を印加しながらインクジェットプリンタで印字した場合の磁気ストライプの磁気特性から判定した。
The square ratio (Br / Bm) is when printing with an inkjet printer using the produced water-based magnetic ink while applying a magnetic field of 3000 Elstead to the printing medium in the horizontal direction and in the direction parallel to the printing direction. It was judged from the magnetic characteristics of the magnetic stripes of.
耐擦性は、上記磁気ストライプを１２時間自然乾燥させた後、不織布で擦り、不織布の汚れの有無を目視で観察した。その結果、２回擦っても全く汚れが生じない場合を○、２回以上擦ると汚れが生じる場合を△、１回の擦りで汚れが生じる場合を×とした。
For the abrasion resistance, the magnetic stripe was naturally dried for 12 hours and then rubbed with a non-woven fabric, and the presence or absence of stains on the non-woven fabric was visually observed. As a result, the case where no stain was generated by rubbing twice was evaluated as ◯, the case where the stain was generated by rubbing twice or more was evaluated as Δ, and the case where the stain was generated by one rubbing was evaluated as ×.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20165899A JP2001028308A (en) | 1999-07-15 | 1999-07-15 | Aqueous magnetic dispersion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20165899A JP2001028308A (en) | 1999-07-15 | 1999-07-15 | Aqueous magnetic dispersion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001028308A JP2001028308A (en) | 2001-01-30 |
| JP2001028308A5 true JP2001028308A5 (en) | 2005-08-04 |
Family
ID=16444757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20165899A Withdrawn JP2001028308A (en) | 1999-07-15 | 1999-07-15 | Aqueous magnetic dispersion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001028308A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008055523A1 (en) * | 2006-11-07 | 2008-05-15 | Stichting Dutch Polymer Institute | Magnetic fluids and their use |
| US9534130B2 (en) * | 2014-05-20 | 2017-01-03 | Troy Group, Inc. | Composition and method of making an aqueous magnetic ink character recognition inkjet ink |
| CN113488330B (en) * | 2021-07-15 | 2023-05-05 | 江苏蓝沛新材料科技有限公司 | Preparation method of functional magnetic slurry and magnetic device |
| CN115259404B (en) * | 2022-08-19 | 2024-04-16 | 广西博世科环保科技股份有限公司 | Preparation and use methods of functionalized suspension filter material |
-
1999
- 1999-07-15 JP JP20165899A patent/JP2001028308A/en not_active Withdrawn
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0863501B1 (en) | Plate-like ferrite particles with magnetoplumbite structure and magnetic card using the same | |
| JP5860307B2 (en) | Curable ink containing inorganic oxide coated magnetic nanoparticles | |
| JP5882795B2 (en) | Solvent-based inks containing coated magnetic nanoparticles | |
| JP2012193349A (en) | Curable ink containing coated magnetic nanoparticle | |
| JP4089808B2 (en) | Erasable microcapsule magnetophoretic display sheet | |
| JP2012193346A (en) | Curable ink containing magnetic nanoparticle coated with surfactant | |
| JP2001028308A5 (en) | ||
| US5605753A (en) | Magneto-plumbite ferrite particles for magnetic card, process for producing the same, and magnetic card using the same | |
| JP2000212498A (en) | Aqueous magnetic dispersion, its preparation, item printed in aqueous magnetic dispersion ink, its printing method | |
| JP2012233053A (en) | Magnetic inkjet ink | |
| JP3973705B2 (en) | Method for producing magnetic particle powder for magnetic barcode | |
| JPH07150085A (en) | Magnetism ink concentrate | |
| JP2001028308A (en) | Aqueous magnetic dispersion | |
| JP3051644B2 (en) | Manufacturing method of magnetic recording medium | |
| JP2004345192A (en) | Magnetic recording method and readable/writable magnetic printer | |
| JP3132536B2 (en) | Manufacturing method of magnetic particle powder for magnetic recording | |
| Chagnon et al. | Controlled coercivity in barium ferrite rigid disk coatings | |
| JP4047393B2 (en) | Magnetic recording medium, valuable document carrying magnetic recording medium, and method of manufacturing magnetic recording medium | |
| JP3417981B2 (en) | Manufacturing method of magnetic particle powder for magnetic recording | |
| JPH07210859A (en) | Magnetic recording medium and its production | |
| JP3084342B2 (en) | Manufacturing method of magnetic recording medium | |
| JP2713370B2 (en) | Reading method of magnetic recording medium | |
| JPH02291102A (en) | Fine-pulverized magnetic hexaferrite having coercive force with negative temperature dependency and its application | |
| JPH0945516A (en) | Magnetic particle powder, its manufacture and water-base magnetic paint using said magnetic particle powder as well as magnetic recording sheet using the water-base magnetic paint | |
| JP2010500280A (en) | Use of powder compositions and media |