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ACTIVE FIBER REINFORCEMENT OF PHOTOCONDUCTIVE LAYERS

IP.com Disclosure Number: IPCOM000023695D
Original Publication Date: 1978-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 333K

Publishing Venue

Xerox Disclosure Journal

Abstract

A solution is proposed to the well-known problem of the mechanical weakness, particularly brittleness, of cast layers of poly(N-vinylcarbazole), polyvinyl pyrene, and similar hole transport polymers used in xerographic photoreceptors. The idea is to reinforce the cast film by drawn fibers of an active transport dielectric, such as PVK, so as to form a well-bonded composite film having improved flexibility and tensile strength without the sacrifice of electrical transport properties.

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XEROX DISCLOSURE JOURNAL

ACTIVE FIBER REINFORCEMENT OF Proposed Classification
PHOTOCONDUCTIVE LAYERS U.S. Cl, 96/1.5
J.W, Weigl mt. Cl, G03g 5/04

A solution is proposed to the well-known problem of the
mechanical weakness, particularly brittleness, of cast layers
of poly(N--vinylcarbazole), polyvinyl pyrene, and similar hole
transport polymers used in xerographic photoreceptors. The
idea is to reinforce the cast film by drawn fibers of an active
transport dielectric, such as PVK, so as to form a well-bonded
composite film having improved flexibility and tensile
strength without the sacrifice of electrical transport
properties.

It is, of course, well known to improve the mechanical proper--
ties of polymer coatings by the inclusion of reinforcing
fibers. Both woven and chopped fibers of high tensile
strength materials have been used, e.g., glass, steel, boron,
boron carbide and graphite. None of these have been suitable
for inclusion in organic photoconductive or active dielectric
coatings since their electrical properties are poorly matched
to those of the surrounding polymeric matrix, These materials
are either excessively conductive or excessively trapping, and
thus are destructive to the good electrical properties of the
composite.

In order to solve the above problem, it is proposed to use
reinforcing fibers of a good transport material, with elec-
trical properties matching those of the surrounding matrix.
For hole transport matrices, such as PVK or polyvinyl pyrene,
fibers of PVK...