Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1979-11-28
1982-01-19
Downey, Mary F.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430109, 430903, 430904, 252 6253, 252 6254, G03G 900, C04B 3564
Patent
active
043117791
ABSTRACT:
Disclosed is a one-component type magnetic developer which comprises a binder medium and 45 to 65% by weight, based on the total developer, of fine particles of a magnetic material dispersed in the binder medium, the binder medium comprising a homopolymer of an aromatic vinyl monomer or a copolymer of (a) at least one aromatic vinyl monomer with (b) at least one mono- or di-ethylenically unsaturated monomer other than the aromatic vinyl monomer and having a weight average molecular weight of 75,000 to 150,000, wherein the electrostatic capacity as determined under conditions of an electrode spacing of 0.65 mm, an electrode sectional area of 1.43 cm.sup.2 and an electrode load of 105 g/cm.sup.2 is 7.8 to 11.7 PF (picofarad), the dielectric constant is 4 to 6 as determined under the above conditions and the electric resistance is at least 5.times.10.sup.13 .OMEGA.-cm as determined under the above conditions.
REFERENCES:
patent: 3239465 (1966-03-01), Rheinfrank
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patent: 3901695 (1975-08-01), Shelffo
patent: 3965022 (1976-06-01), Strong
patent: 4175962 (1979-11-01), Sadamatsu
patent: 4187330 (1980-02-01), Harada
patent: 4192902 (1980-03-01), Lu
Miyakawa Nobuhiro
Teshima Takashi
Downey Mary F.
Mita Industrial Company Limited
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