Terpolymers useful as charge injection barrier materials for pho

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product

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430 56, 430 64, 430 66, 430 67, 430 96, 430131, 430132, G03G 514

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058585923

ABSTRACT:
A thin (<5 .mu.m) charge injection barrier layer is provided on a top surface of an inverse dual layer photoconductor using hole transport or on at least one surface of a single layer photoconductor or on an electrically conductive substrate of a conventional dual layer photoconductor using either hole transport or electron transport. The charge injection barrier layer comprises at least one terpolymer given by injection prohibitor to prevent leakage of charge from the surface, B is a solubility control moiety to control solubility of the polymer and its glass transition temperature, and C is an electron charge moiety for neutralizing surface charge. Each of the moieties A, B, and C contain a vinyl group. The value of x is at least about 0.01, y is within the range of about 0.01 to 0.3, and z is within the range of about 0.01 to 0.4, with the sum of x+y+z=1. The value of n is sufficient to provide the polymer with a molecular weight (weight average basis) in the range of about 1,000 to 1,500,000. The charge injection barrier employing these terpolymers (1) stops the charge injection from the surface and stabilizes the dark decay and the charge acceptance of the device; (2) allows an electron transfer/transport from the charge generation layer to the surface in order to effectively neutralize the surface charge while avoiding the charge build-up with repeat cycle due to electron trapping; and (3) controls the polymer chain movement phenomena associated with the solubility and the glass transition temperature T.sub.g.

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Grant et al, eds. Grant & Hackh's Chemical Dictionary, Fifth Edition, McGraw-Hill Book Co., NY (1987), p. 298.

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