Eastman-kodak Company

Ernest W Turnblom

Joseph Y Kaukeinen

Hal E Wright

Stewart H Merrill

Frederick A Stahly

Beth G Wright

The present invention provides novel composite electrically photosensitive particles. Each of said particle comprises a colorant and a polymeric binder comprising repeating units containing one or more structures selected from the classes consisting of triarylamines; p-aminotetraarylmethanes; 4,4'-bis(p-amino)triarylmethanes; 1,1-bis(p-aminoaryl)isobutanes; 1,1-bis(p-aminoaryl)cyclohexanes; N-alkyl-N,N-diarylamines; N,N-dialkyl-N-arylamines and heterocyclic nitrogen compounds having about 4 to 10 carbon atoms.

Composite electrically photosensitive particles for electrophoretic

A subtractive color electrophotographic process is disclosed for producing a multicolor print from a single exposure of a color original. The process utilizes a novel multilayer recording element containing an electrically conducting layer, an insulating layer and two or more photoconductive layers, each spectrally sensitized to a different portion of the optical spectrum. In carrying out the process, the recording element is first uniformly charged and exposed to a color original and then developed by a multistep procedure. Each step of the development procedure comprises flood exposing the recording element to radiation to which at least one of the photoconductive layers is responsive while applying toner particles having a different subtractive color characteristic and an appropriate electrical bias.

Color electrophotographic recording element

Color electrophotographic process, apparatus and recording element

A photoconductive insulating composition containing (a) one or more p-type organic photoconductor components and (b) a charge transfer complex of one or more electron acceptor components and one or more electron donor components, the electron donor components being selected from materials having one of the following formulas: ##STR1## wherein N REPRESENTS 0, 1 OR 2; X represents oxygen, sulfur, selenium or the groups &gt;CR.sup.3 R.sup.4 or &gt;C.dbd.CR.sup.5 R.sup.6 ; Y represents a single covalent chemical bond or the necessary carbon and hydrogen atoms to complete a 6 to 9 member saturated or unsaturated ring; and each of R.sup.1 through R.sup.8 represents a substituent group such that the resultant material forms a charge-transfer complex with 2,4,7-trinitro-9-fluorenone.

Growing community of inventors

Rochester, NY, United States of America

Ernest W Turnblom