Amplification of developed electrographic image patterns
AssigneeEastman Kodak Company
InventorsMark Lelental, Joseph Y. Kaukeinen
Life of this patent
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Abstract
Electrographic image patterns are developed using marking particles containing a catalyst or catalyst precursor. The developed image pattern is then amplified by contacting it with high gain chemical-redox amplification composition.
Claims18
A method for amplifying a developed charge pattern residing on an insulating receiver comprising the steps of:
- (a) contacting a charge pattern with an electrographic developer composition comprising a carrier and marking particles having a polarity opposite that of said charge pattern thereby producing said developed charge pattern;
- wherein said marking particles contain a resin and a catalyst or catalyst precursor which is a metal or metal compound and said metal is selected from the metals forming groups VIII and IB of the Periodic Table including alloys and mixtures of such metals;
- and
- (b) contacting said developed charge pattern with a high gain chemical redox amplification composition.
A method for amplifying a developed electrographic image pattern comprising the steps of:
- (a) contacting a charge pattern with an electrographic developer composition comprising marking particles containing a resin and a catalyst or catalyst precursor thereby charging said particles;
- wherein said catalyst is a metal or metal compound and said metal is selected from the group of metals forming groups VIII and IB of the Periodic Table, including alloys and mixtures of such metals;
- (b) depositing said charged particles on a receiver surface thereby forming said developed electrographic image pattern;
- and
- (c) contacting the developed image pattern while on the receiver with a high gain chemical redox amplification composition.
A method of amplifying a developed image pattern formed in an electrophoretic migration imaging process comprising the steps of:
- (a) subjecting an electrically photosensitive material positioned between at least two electrodes to an applied electric field, wherein said electrically photosensitive material contains a catalyst or catalyst precursor which is a metal or metal compound and said metal is selected from the group of metals forming groups VIII and IB of the Periodic Table, including alloys and mixtures of such metals;
- (b) exposing said material to an image pattern of radiation to which the material is photosensitive, thereby obtaining a developed image pattern on at least one of said electrodes;
- and
- (c) contacting the developed image pattern with a high gain chemical-redox amplification composition.
An electrographic marking particle comprising an electrically photosensitive particle and a catalyst or catalyst precursor which is a metal or metal compound and said metal is selected from the group of metals forming groups VIII and IB of the Periodic Table, including alloys and mixtures of such metals.
An electrographic developer composition comprising a carrier and a marking particle containing an electrically photosensitive material and a catalyst or catalyst precursor which is a metal or metal compound, wherein said metal is selected from the metals forming groups VIII and IB of the Periodic Table, including alloys and mixtures of such metals.
Dependencies are inferred from the claim text.