Monomeric glass mixtures incorporating tetracarbonylbisimide group

1. A photoconductive element comprising an electrically conductive support, an electrical barrier layer disposed over said electrically conductive support, and disposed over said barrier layer, a charge generation layer capable of generating positive charge carriers when exposed to actinic radiation, said barrier layer comprising a crosslinked reaction product of a monomeric glass mixture of at least two nonpolymeric, thermoplastic compounds incorporating tetracarbonylbisimide groups, wherein the monomeric glass mixture has been rendered substantially impervious to solvents used for coating the charge generation layer over the barrier layer by using crosslinking reaction.

2. The photoconductive element of claim 1 wherein the monomeric glass mixtures comprises at least two nonpolymeric, thermoplastic compounds, each thermoplastic compound independently conforming to the structure:

(R 1 Y 1 ) p [(Z 1 Y 2 ) m R 2 Y 3 ] n Z 2 Y 4 R 3

wherein

m is zero or one;

n is the number of recurring units in the compound, and is zero up to, but not including, an integer at which said compound starts to become a polymer;

p is an integer of from one to eight;

each R 1 and R 3 is independently a monovalent aliphatic or cycloaliphatic hydrocarbon group having 1 to 20 carbon atoms, an aromatic group or a multicyclic aromatic nucleus;

R 2 , Z 1 and Z 2 each independently represent multivalent aliphatic or cycloaliphatic hydrocarbon groups having 1 to 20 carbon atoms or an aromatic group where at least one of R 2 , Z 1 and Z 2 is a tetracarbonyl aromatic group of the formula:

where Ar= a tetravalent aromatic group having from 6 to 20 carbon atoms and may be the same or different;

Y 1 , Y 2 , Y 3 and Y 4 each independently represents one or more linking groups such as esters (—COO—), amides (—CONH—), urethanes (—NHCOO—), imides

wherein R′ represents alkyl of 1-6 carbon atoms, hydroxyl, amino or aryl such as phenyl and 1,3,4-oxadiazol-2,5-ylenes

 provided that at least one of Y 1 and Y 2 , Y 2 and Y 3 , or Y 3 and Y 4 are imide groups linking the tetra carbonyl aromatic group of the formula:

3. The photoconductive element of claim 2 , wherein the crosslinking reaction employs urethane, epoxy, or phenolic crosslinking chemistry.

4. The photoconductive element of claim 1 , wherein the crosslinking reaction employs urethane, epoxy, or phenolic crosslinking chemistry.