Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1989-09-25
1990-10-23
Welsh, J. David
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
428407, B32B 900, G03G 910
Patent
active
049651609
ABSTRACT:
A developer carrier is disclosed, which has a core containing a binder resin and a magnetic powder, and a surface layer thereon containing a compound having a lower critical surface tension than the binder resin. This developer when used in a magnetic brush development process provides superior charge characteristics, resistance to environmental changes, and extended life. In another aspect, the invention relates to a developer carrier produced by a process of (a) melting a carrier composition containing a binder resin, a magnetic powder and a compound having a lower critical surface tension than the binder resin, (b) spraying the molten carrier composition to form droplets, and (c) cooling the droplets with a gas stream having a temperature lower than the melting point of the composition to form substantially spherical particles having a high surface smoothness.
REFERENCES:
patent: 3767578 (1973-10-01), Hagenbach et al.
patent: 3795618 (1974-05-01), Kasper et al.
patent: 3873355 (1975-03-01), Queener et al.
patent: 3918968 (1975-11-01), Kukla et al.
Aoki Takayoshi
Matsumura Yasuo
Nagatsuka Ikutaroh
Suzuki Chiaki
Takeda Masayuki
Fuji 'Xerox Co., Ltd.
Welsh J. David
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