Photocopying – Contact printing – Light boxes
Patent
1994-05-04
1995-11-28
Grimley, A. T.
Photocopying
Contact printing
Light boxes
430114, 430115, G06G 1510, G06G 912
Patent
active
054712874
ABSTRACT:
System for replenishing liquid developer in equipment, such as a printer, whereby the percent of toner solids is maintained at about 0.5 to 4% by weight based on the total weight of liquid developer, the system comprising at least one liquid toner concentrate vessel containing aggregates of thermoplastic resin particles, median particle size (volume weighted) greater than 15 .mu.m, and with 90% of the particles (volume weighted) not less than 30 .mu.m, composed of 50 to 100% by weight of particles and 0 to 50% by weight carrier liquid; a liquid vessel containing carrier liquid, means communicating each of said vessels with a dispersing vessel containing high shearing or high impact means wherein contents of the liquid toner concentrate vessel and the liquid vessel are supplied thereto and the resin particles are dispersed in the carrier liquid to form particles having a median particle size (volume weighted) of less than 15 .mu.m, and with 90% of the particles (volume weighted) less than 30 .mu.m in an amount of about 0.5 to 20% by weight of resin particles and about 99.5 to 80% by weight carrier liquid said dispersion being supplied and metered into the supply vessel containing original liquid developer to maintain the desired weight of solids. The system is useful in copying, proofing, etc., equipment, and the liquid developer is useful for making copies, proofs, lithographic printing plates and resists.
REFERENCES:
patent: 4707429 (1987-11-01), Trout
patent: 4798778 (1989-01-01), El-Sayed et al.
patent: 4799452 (1989-01-01), Day
patent: 4860050 (1989-08-01), Kurotori et al.
patent: 5017451 (1991-05-01), Larson et al.
patent: 5206108 (1993-04-01), Felder et al.
patent: 5345296 (1994-09-01), Wellings
Blair David E.
Houle William A.
Lane Gregg A.
Larson James R.
Pearlstine Kathryn A.
E. I. Du Pont de Nemours and Company
Grimley A. T.
Ramirez Nestor R.
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