Eastman-kodak Company

John L Fox

Chin H Chen

Samir Y Farid

Donald P Specht

Yann Hung

Novel tetrasubstituted dicyanomethylene cyclopentadienes are provided which have utility as electron-transport agents in positively-charged electrophotographic elements. The compounds are characterized by the formula: ##STR1## wherein: R.sub.1 and R.sub.4 are each independently selected from the group consisting of lower alkyl, halogen and cyano;

Substituted cyclopentadiene electron transport compounds

A 6-tertiary amino-2-(Z.dbd.CH--)benzofuran dye is disclosed, where Z represents the atoms providing an electron withdrawing group and a conjugated methine linkage completing a resonant dye chromophore including the 6-tertiary amino group as an electron donor and the electron withdrawing group as an electron acceptor. The dyes are formed by condensing a 6-tertiary amino-2-formylbenzofuran with an electron withdrawing dye nucleus precursor containing an active methyl or methylene site. The dyes exhibit bathocromically shifted absorption peaks.

Benzofuran dyes containing a coumarin nucleus

A 6-tertiary amino-2-(Z.dbd.CH--)benzofuran dye is disclosed, where Z represents the atoms providing an electron withdrawing group and a conjugated methine linkage completing a resonant dye chromophore including the 6-tertiary amino group as an electron donor and the electron withdrawing group as an electron acceptor. The dyes are formed by condensing a 6-tertiary amino-2-formylbenzofuran with an electron withdrawing dye nucleus precursor containing an active methyl or methylene site. The dyes exhibit bathochromically shifted absorption peaks.

Benzofuran dyes

Novel benzofuran dyes

A photographic imaging system is disclosed comprised of a hardenable organic component containing ethylenic unsaturation sites and coinitiators for ethylenic addition. The coinitiators include an activator and a photosensitizer. The photosensitizer is a 6-tertiary amino-2-(Z--CH.dbd.)benzofuran dye, where Z represents the atoms providing an electron withdrawing carbonyl or sulfonyl group and completing a conjugated methine linkage extending from the electron withdrawing carbonyl group through the benzofuran to the electron donating 6-tertiary amino substituent to form a resonant dye chromophore. The photosensitizers bathochromically extend exposure response of the imaging system.

Dye sensitized photographic imaging systems

Novel benzopyrano[6,7,8-i,j]quinolizine-11-one lasing dyes and intermediates for their preparation are disclosed. 2

Novel benzopyrano[6,7,8-i,j]quinolizine-11-one lasing dyes

Novel benzopyrano[6,7,8-i,j]quinolizine-11-one lasing dyes and intermediates for their preparation are disclosed.

Benzopyrano[6,7,8-i,j]quinolizine-11-one lasing dyes and intermediates

Phosphonocoumarins and phosphacoumarin lasing dyes are disclosed.

Growing community of inventors

Baltimore, MD, United States of America

John L Fox