 Flying decoy |
| The decoy of the present invention can be constructed as a small, compact disposable missile which ... |
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| Line carrying projectile |
| OF PREFERRED EMBODIMENT In the drawing, a line carrying projectile embodying the present invention ... |
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| Non-toxic frangible bullet core |
| We have discovered that, if a very high grade of zinc is utilized in the making of a bullet core, ... |
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| Analog-to-digital converter |
| It is an object of the invention to provide a successive-approximation analog-to-digital converter ... |
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| Devices incorporating phonon filters |
| Much to our surprise, we discovered that phonons can be transmitted efficiently through a plurality ... |
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| Superconducting device including a thin chromium film with negative susceptibility |
| It is therefore an object of the present invention to improve superconductors. A further object of ... |
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| Switchable superconducting mirrors |
| I claim: 1. A reflection apparatus, comprising: a source of electromagnetic radiation emitting a ... |
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| Superconducting Josephson junction gyroscope apparatus |
| Accordingly, it is an object of the present invention to provide an improved gyroscope apparatus ... |
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Magnetic particles used for electrostatic latent image developer and process for producing the same
| Details |
Inventors: Takaragi, Shigeru; Hakata, Toshiyuki; Fujioka, Kazuo; Toda, Tetsuro;
Assignee: Toda Kogyo Corporation (Hiroshima, JP)
Primary Examiner: Martin; Roland
Assistant Examiner:
Attorney, Agent or Firm: Nixon & Vanderhye
Disclosed herein are magnetic particles used for an electrostatic latent image developer comprising composite particles containing from more than 80% by weight to not more than 99% by weight of fine ferromagnetic particles and a cured phenol resin, and having a number-average particle diameter of from not less than 1 .mu.m to less than 10 .mu.m and an apparent density of not greater than 1.5 g/cm.sup.3. |
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DETAILED DESCRIPTION OF THE INVENTION The number-average particle diameter of the composite particles according to the present invention is from not less than 1 .
mu.
m to less than 10 .
mu.
m.
If it is less than 1 .
mu.
m or not less than 10 .
mu.
m, it is not preferred for the magnetic particles used for an electrostatic development as an object of the present invention.
Since the particle diameter of the magnetic particles has a close relation with the particle diameter of the magnetic toner used together it may be properly selected within a range from not less than 1 .
mu.
m to less than 10 .
mu.
m, preferably from 2 to 8 .
mu.
m.
The apparent density of the composite particles according to the present invention is not greater than 1.
5 g/cm.
sup.
3.
The low apparent density enables to provide higher image quality and, since the particles are of low apparent density and soft, they do not injure a roller, etc.
upon fixing by the roller.
The electric resistivity of the magnetic particles comprising the composite particles according to the present invention, as expressed by the volumic electric resistivity, is less than 10.
sup.
12 ohm.
cm, preferably not greater than 10.
sup.
9 ohm.
cm.
Further, the composite particles according to the present invention is excellent in the fluidity and the fluidizing rate is, for example, not less than 0.
45 g/sec, preferably, not less than 0.
48 g/sec.
The content of the fine ferromagnetic particles in the composite particles according to the present invention is from more than 80% by weight to not more than 99% by weight, preferably from 82 to 95% by weight.
If it is not greater than 80% by weight, the content of the insulative resin component is increased, failing to obtain composite particles with the volumic electric resistivity of less than 10.
sup.
12 ohm.
cm.
If it exceeds 99% by weight, bonding force between each of the fine ferromagnetic particles is reduced and fine ferromagnetic particles are separated individually to increase the amount of fine particles having less than 1
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