JP2000233930A5 - - Google Patents
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- JP2000233930A5 JP2000233930A5 JP2000015768A JP2000015768A JP2000233930A5 JP 2000233930 A5 JP2000233930 A5 JP 2000233930A5 JP 2000015768 A JP2000015768 A JP 2000015768A JP 2000015768 A JP2000015768 A JP 2000015768A JP 2000233930 A5 JP2000233930 A5 JP 2000233930A5
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- carrier core
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Description
【特許請求の範囲】
【請求項１】 １０〜５０モル％の酸化マンガンと、約９０〜５０モル％の酸化鉄(ＩＩＩ)と、組成物の０．５〜１０重量％となるように含まれる二酸化チタン化合物とから実質的に構成される組成物を有し、前記構成物質は共に焼結され１００ボルトにおける３×１０７から１×１０８ Ω・ｃｍの範囲の抵抗率を有するスピネル様の化学量論材料を形成するキャリアコア。
【請求項２】 ポリマーコーティングを有する請求項１に記載のキャリアコア。
【請求項３】 前記組成物の磁気モーメントが約６３２０Ａｍ２/ｇ（約８０ｅｍｕ／ｇ）未満である請求項１の組成を有するキャリアコア。
【請求項４】 前記組成物の磁気モーメントが約３１６０〜６３２０Ａｍ２/ｇ(約４０〜８０ｅｍｕ／ｇ)の範囲である請求項１に記載の組成を有するキャリアコア。
【請求項５】 平均粒子径が約５０μｍである粉末の形態を有する請求項１に記載の組成を有するキャリアコア。
【請求項６】 組み合わせて、粒子とトナーとの形状を有する請求項１の組成を有するキャリアコア。
【請求項７】 約２％未満の酸素雰囲気にて焼結され、フェライトの化学量論性を保持する請求項１のキャリアコア。
【請求項８】 約０．２％未満の酸素雰囲気にて焼結され、フェライトの化学量論性を保持する請求項１のキャリアコア。
【請求項９】 平均粒径が約５０μｍの粒子から実質的に構成され、
前記粒子は０．３５〜０．４５モル分率のＭｎＯと０．５５〜０．６５モル分率のＦｅ２Ｏ３と、さらに４．５〜５．５重量％となるよう添加されたＴｉＯ２から実質的に構成され、
磁気モーメントが４７４０〜５５３０Ａｍ２/ｇ（６０〜７０ｅｍｕ／ｇ）の範囲内であり、
１００Ｖにおける抵抗率が４〜６×１０７Ω・ｃｍの範囲であり、化学量論的なスピネル結晶構造であるキャリアコア粒子。
[Claims]
1. A composition comprising 10 to 50 mol% of manganese oxide, about 90 to 50 mol% of iron (III) oxide and 0.5 to 10% by weight of the composition of a titanium dioxide compound. A composition comprising a substantially constituted composition, wherein the constituent materials are sintered together to form a spinel-like stoichiometric material having a resistivity in the range of 3 × 10 7 to 1 × 10 8 Ω · cm at 100 volts. Carrier core to be formed.
2. The carrier core according to claim 1, having a polymer coating.
3. A carrier core having the composition of claim 1 wherein the magnetic moment of the composition is less than about 6320 Am 2 / g (about 80 emu / g).
4. The carrier core of claim 1, wherein the magnetic moment of the composition ranges from about 3160 to 6320 Am 2 / g (about 40 to 80 emu / g).
5. The carrier core having the composition according to claim 1, which is in the form of a powder having an average particle size of about 50 μm.
6. A carrier core having the composition of claim 1 which in combination has the shape of particles and toner.
7. The carrier core of claim 1, wherein the carrier core is sintered in an oxygen atmosphere of less than about 2% and retains the stoichiometry of the ferrite.
8. The carrier core of claim 1, wherein the carrier core is sintered in an oxygen atmosphere of less than about 0.2% and retains the stoichiometry of the ferrite.
9. Substantially composed of particles having an average particle size of about 50 μm,
The particles comprise 0.35 to 0.45 mole fraction of MnO, 0.55 to 0.65 mole fraction of Fe 2 O 3, and TiO added to be 4.5 to 5.5 wt%. Consisting essentially of two ,
Magnetic moment in the range of 4740~5530Am 2 / g (60~70emu / g ),
Carrier core particles having a resistivity in the range of 4 to 6 × 10 7 Ω · cm at 100 V and a stoichiometric spinel crystal structure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/236,244 US6294304B1 (en) | 1998-01-23 | 1999-01-25 | Environmentally benign high conductivity ferrite carrier with widely variable magnetic moment |
| US09/236244 | 1999-01-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000233930A JP2000233930A (en) | 2000-08-29 |
| JP2000233930A5 true JP2000233930A5 (en) | 2007-03-01 |
Family
ID=22888710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000015768A Pending JP2000233930A (en) | 1999-01-25 | 2000-01-25 | Environmentally harmless high conductivity ferrite carrier core composition having magnetic moment adjustable over wide range and its particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000233930A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6232026B1 (en) * | 2000-05-17 | 2001-05-15 | Heidelberg Digital L.L.C. | Magnetic carrier particles |
| JP5240901B2 (en) | 2008-01-31 | 2013-07-17 | パウダーテック株式会社 | Carrier core material for electrophotographic developer, carrier and electrophotographic developer using the carrier |
| JP5488910B2 (en) * | 2010-06-30 | 2014-05-14 | パウダーテック株式会社 | Ferrite carrier core material and ferrite carrier for electrophotographic developer, and electrophotographic developer using the ferrite carrier |
| RU2543973C1 (en) * | 2014-03-27 | 2015-03-10 | Открытое Акционерное Общество "Конструкторское Бюро-1" | Ferrite material |
| RU2543523C1 (en) * | 2014-03-27 | 2015-03-10 | Открытое Акционерное Общество "Конструкторское Бюро-1" | Ferrite material |
-
2000
- 2000-01-25 JP JP2000015768A patent/JP2000233930A/en active Pending
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