Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1997-11-21
1998-11-17
Martin, Roland
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
110111, G03G 9083
Patent
active
058374132
ABSTRACT:
The invention provides a magnetic toner for electrophotography in which an ultrafine particle form of titanium oxide (having a specific surface area of 80 to 120 m.sup.2 /g, a degree of hydrophobicity of 50 to 80% by weight, and an alumina content of 0.4 to 1.1% by weight) made hydrophobic on its surface with an aluminum compound of a fatty acid, and a hydrophobic silica are externally added onto a magnetic toner particle, and which can provide images of high density and high quality over an extended period, with no filming observed on a photosensitive material. The invention also provides a developer for electrophotography in which 10 to 40 parts by weight of a carrier particle are mixed with 100 parts by weight of a magnetic toner wherein an ultrafine particle form of titanium oxide (having a specific surface area of 80 to 120 m.sup.2 /g, a degree of hydrophobicity of 50 to 80% by weight, and an alumina content of 0.4 to 1.1% by weight) made hydrophobic on its surface with an aluminum compound of a fatty acid, and a hydrophobic silica are externally added onto a magnetic toner particle, and which has high transfer efficiency, and can provide images of high density and high quality over an extended period, with no solid black image tone variations observed even at high temperature and humidity.
REFERENCES:
patent: 4904558 (1990-02-01), Nagatsuka et al.
patent: 5354640 (1994-10-01), Kanbayashi et al.
patent: 5672454 (1997-09-01), Sasaki et al.
patent: 5698357 (1997-12-01), Inoue et al.
patent: 5707772 (1998-01-01), Akimoto et al.
Ito Naoki
Yada Yoshio
Martin Roland
TDK Corporation
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