Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1981-11-13
1983-09-13
Martin, Jr., Roland E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
4301066, 430109, 430110, 430111, G03G 914
Patent
active
044042698
ABSTRACT:
A two-component dry-type composite developer which is a mixture of 100 parts of (A) magnetic toner particles of a binder resin and 40 to 70% by weight of magnetite having a bulk density of at least 0.45 g/ml, a number average maximum size of at least 0.5 .mu.m and a maximum size/minimum size ratio of from 1.0 to 5.5 and 1 to 30 parts of (B) non-magnetic toner particles of binder resin, pigment and negative charge controlling agent. The magnetic toner particles have an electrostatic capacitance of 7 to 8.5 picofarad, a dielectric constant of 3.59 to 4.36, and a volume resistivity of 1.2 to 8.6.times.10.sup.14 .OMEGA.-cm, and the nonmagnetic toner particles have an electrostatic capacitance of 6.0 to 8.0 picofarad and a dielectric constant of 3.08 to 4.10. The toner particles (A) and (B) have friction chargeability characteristics of the same polarity and are consumed at the same rate during development such that the mixing ratio remains constant and the development characteristics are not changed during use. Copies of from soft to hard tones can be obtained by changing the mixing ratio. Development and transfer efficiencies are improved.
REFERENCES:
patent: 2965573 (1960-12-01), Gundlach
patent: 3234017 (1966-02-01), Heyl
patent: 3520811 (1970-07-01), Swoboda
patent: 4031021 (1977-06-01), Deming
patent: 4142981 (1979-03-01), Bean et al.
patent: 4165393 (1979-08-01), Suzuki et al.
patent: 4218530 (1980-08-01), Lu
patent: 4239845 (1980-12-01), Tanaka et al.
patent: 4272600 (1981-06-01), Sypula et al.
patent: 4277552 (1981-07-01), Asanae et al.
patent: 4311779 (1982-01-01), Miyakawa et al.
patent: 4315064 (1982-02-01), Miyakawa et al.
patent: 4331757 (1982-05-01), Tanaka et al.
patent: 4345014 (1982-08-01), Oka et al.
patent: 4362802 (1982-12-01), Tanaka et al.
Fujii Masanori
Maekawa Kouzi
Miyakawa Nobuhiro
Martin Jr. Roland E.
Mita Industrial Co. Ltd.
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