Electrographic liquid developers containing azo dye marking particles derived from 2,3-naphthalenediol or derivatives thereof
AssigneeEastman Kodak Company
InventorsJohn A. Ford, Jr., Louis J. Rossi, Domenic Santilli
Life of this patent
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Abstract
An electrographic liquid developer comprising a carrier liquid and a marking particle which comprises a dye compound having the formula: ##STR1## wherein: R.sup.1 is H, COOH, CONH.sub.2, --SO.sub.2 NH.sub.2 or --SO.sub.3 M where M is Na.sup.+ or NH.sub.4 ; R.sup.2 is a lower alkoxy radical, --OCH.sub.2 CONH.sub.2, or ##STR2## where each of R.sup.6 and R.sup.7 is a lower alkyl radical; and R.sup.3 is H, a lower alkyl radical, a lower alkoxy radical or NO.sub.2.
Claims21
An electrographic liquid developer comprising a liquid carrier having a dielectric constant of less than about 3 and having a volume resistivity of greater than about 10.sup.10 ohm-cm., and a marking particle comprising a dye having the formula ##STR10## wherein:
- R.sup.1 is selected from the group consisting of a hydrogen atom, --SO.sub.2 NH.sub.2 and --SO.sub.3 M, where M is Na.sup.+ or NH.sub.4.sup.+ ;
- R.sup.2 is selected from the group consisting of lower alkoxy radicals having from 1 to about 4 carbon atoms, --OCH.sub.2 CONH.sub.2 and ##STR11## where each of R.sup.6 and R.sup.7 is selected from lower alkyl radicals having from 1 to about 4 carbon atoms;
- and
- R.sup.3 is selected from the group consisting of a hydrogen atom, lower alkyl radicals having 1 to about 4 carbon atoms, a halogen atom, NO.sub.2 and lower alkoxy radicals having from 1 to about 4 carbon atoms.
An electrographic liquid developer comprising a liquid carrier having a dielectric constant of less than about 3 and having a volume resistivity of greater than about 10.sup.10 ohm-cm., and a marking particle comprising a dye having the formula:
- ##STR12## wherein:
- R.sup.1 is selected from the group consisting of a hydrogen atom, --SO.sub.2 NH.sub.2 and --SO.sub.3 M where M is Na.sup.+ or NH.sub.4.sup.+ ;
- R.sup.2 is selected from the group consisting of lower alkoxy radicals having from 1 to about 4 carbon atoms and --OCH.sub.2 CONH.sub.2 ;
- and
- R.sup.3 is selected from a hydrogen atom or NO.sub.2.
Dependencies are inferred from the claim text.