Degradable resins for electrostatic liquid developers
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United States of America Patent
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May 4, 1993
Issued Date -
N/A
app pub date -
Jan 10, 1992
filing date -
Jul 13, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Electrostatic liquid developer consisting essentially of (A) nonpolar liquid having Kauri-butanol value less than 30, present in major amount, (B) particles, average by area particle size of less than 10 .mu.m, of a degradable polymeric resin as defined, and (C) nonpolar liquid soluble ionic or zwitterionic charge director compound. Optionally a colorant and an adjuvant compound are present. Process of preparation of electrostatic liquid developers is described. The developer is useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists. The developer particles can be readily removed from the printed material, such as paper, by degradation of the polymer. If the polymeric resin is depolymerized, the monomer and low molecular weight units can be recycled by being repolymerized, or discarded in a landfill as a biodegradable environmentally benign by-product.
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