Mineral acids as charge adjuvants for positive liquid electrostatic developers
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United States of America Patent
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Jul 23, 1991
Grant Date -
N/A
app pub date -
May 11, 1990
filing date -
May 11, 1990
priority date (Note) -
Expired
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Abstract
A positive charged electrostatic liquid developer consisting essentially of (A) a non-polar liquid having a Kauri-butanol value of less than 30, (B) thermoplastic resin particles, average by area particle size of less than 10 .mu.m, (C) a charge director compound, and (D) at least one inorganic acid having a solubility of at least 0.5% based on the weight of charge director compound in a mixture of (A) and (C) and represented by the formula: H.sub.x Y wherein x is an integer from 1-4 and is equal to the negative charge on the anion, Y is a moiety selected from the group consisting of Cl.sup.-, F.sup.-, NO.sub.3.sup.-, NO.sub.2.sup.-, PO.sub.4.sup.-3, SO.sub.4.sup.-2, SO.sub.3.sup.-2, ClO.sub.4.sup.-, and IO.sub.4.sup.-. The liquid developer is useful in copying, color proofing, digital color proofing, making lithographic printing plates, and resists.
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