Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1994-10-12
1996-04-30
Martin, Roland
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430111, 4301066, G03G 9097, G03G 908
Patent
active
055124062
ABSTRACT:
A toner for electrophotography, comprising toner particles and an additive, is obtained by mixing toners A and B together which are obtained by respectively adding the additive to each of at least two toner particle groups (a) and (b) having different particle size distributions. The average particle size of the toner particle group (a) is smaller than that of the toner particle group (b), and the amount of additive in the toner A is larger than that in the toner B. The toner reduces the differences in development conditions between different particle sizes due to broadening of toner particle size distribution, thereby enabling a stable image quality to be obtained which maintains a high image density for an extended period of time and is relatively free from fog generation in non-image portions.
REFERENCES:
patent: 2221776 (1940-11-01), Carlson
patent: 2297691 (1942-10-01), Carlson
patent: 2618552 (1952-11-01), Wise
patent: 2874063 (1959-02-01), Greig
patent: 3909258 (1975-09-01), Kotz
patent: 5082761 (1992-01-01), Tasaka et al.
"Toner Mixture To Reduce Background Transfer effects", Xerox Discl. Jour., vol. 2, No. 5, Sep./Oct. 1977, p. 17.
Itoh Isami
Itoh Nobuyuki
Kemmochi Kazuhisa
Nakano Masao
Tada Tatsuya
Canon Kabushiki Kaisha
Martin Roland
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