Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1981-11-12
1985-04-23
Welsh, John D.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430109, 430904, G03G 910
Patent
active
045130752
ABSTRACT:
A developer material for electrostatic images comprising a mixture of (1) a coated carrier and (2) a toner.
(1) The carrier consists of core beads coated with a coating resin comprising a butadiene homopolymer of a molecular weight of from 10,000 to 100,000, for the butadiene homopolymer is 1,2-polybutadiene and/or cyclized cis-1,4-polybutadiene or a mixture of at least one of these homopolymers and a styrene/butadiene copolymer of a molecular weight of from 10,000 to 100,000, the mixture containing from 7.5 to 100% by weight, based on the weight of the mixture, of butadiene in polymerized form.
(2) The toner comprises, based on the weight of the toner, (A) from 85 to 95% by weight of a binder resin comprising, based on the weight of the binder resin, from 50 to 100% by weight of an epoxy resin of a molecular weight of from 900 to 8,000 and from 0 to 50% by weight of a styrene/alkyl methacrylate copolymer, the alkyl group having from 1 to 4 carbon atoms, of a molecular weight of from 10,000 to 100,000; (B) a colorant comprising, based on the weight of the toner, from 0 to 10% by weight of fine carbon and from 0.5 to 8% by weight of a nigrosine dye, and; (C) from 0 to 8% by weight of a charge controlling agent, based on the weight of the toner, comprising a quaternary ammonium alkyl sulfonate, the alkyl group having from 4 to 20 carbon atoms, or di-(polyhydroxyethoxy ethyl) octadecyl amine, or a polyamine.
The ratio of the total surface area of the coated carrier to the total projection area of the toner particles is in the range of from 1:0.5 to 1:2.0.
REFERENCES:
patent: 3526533 (1970-09-01), Jacknow et al.
patent: 3718594 (1973-02-01), Miller
patent: 3939086 (1976-02-01), Hagenbach
patent: 4020358 (1977-05-01), Tomono et al.
patent: 4137188 (1979-01-01), Uetake et al.
Muramatsu Kiyohide
Narusawa Toshiaki
Okada Seiji
Okuyama Hirofumi
Yagishita Teruo
Fujitsu Limited
Welsh John D.
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