Photoconductive composition

DETAILED DESCRIPTION OF THE INVENTION The present invention embodies a photoconductive composition comprising a mixture of (a) an infrared-sensitive organic photoconductor sensitive to light in the wavelength range of 700-900 nm and present in an amount of about 0.
1.
2 wt.
%; (b) a visible light-sensitive organic photoconductor sensitive to light in the wavelength range of 400-700 nm and present in an amount of about 1--20 wt.
%, the ratio of the visible light-sensitive organic photoconductor to the infrared-sensitive organic photoconductor being in the range of about 8:1.
200:1; (c) an ultraviolet-sensitive organic photoconductor sensitive to light in the wavelength range of 300-400 nm and present in an amount of about 10.
20 wt.
%; and (d) a binder, present in an amount of about 60-85 wt.
%.
Preferably, the infrared-sensitive organic photoconductor is present in an amount of 0.
5-1 wt.
% and the ratio of the visible light-sensitive organic photoconductor to the infrared-sensitive organic photoconductor is in the range of 20:1-200:1.
The preferred infrared-sensitive organic photoconductor is an anthraquinone dye or phthalocyanine.
A particularly preferred infrared-sensitive organic photoconductor is C.
I.
Vat Brown 22 having the formula: ##STR1## The phthalocyanines of the following structure are also useful infrared-sensitive organic photoconductors: ##STR2## wherein Z is selected from the group consisting of H.
sub.
2, Ti.
dbd.
O, V.
dbd.
O, Al-13 Cl, Mg--Cl and Cu--Cl.
Preferably, the visible light-sensitive organic photoconductor comprises C.
I.
Pigment Orange 43 having the formula ##STR3## Alternatively, the visible light-sensitive organic photoconductor may be an anthanthrone compound having the formula ##STR4## wherein X.
sub.
1 and X.
sub.
2 are the same or different halogen atoms and n is an integer of 0 to 4.
Preferably, the ananthrone compound is Monolyte Red 2Y, also known as C.
I.
Pigment Red 168, having the formula: ##STR5## The ultraviolet-sensitive organic photoconductor comprises an oxadiazole compound such as any of those described in U