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PROCESS FOR ENHANCEMENT OF MECHANICAL PROPERTIES OF PHOTOCONDUCTIVE POLYMERS

IP.com Disclosure Number: IPCOM000023510D
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 416K

Publishing Venue

Xerox Disclosure Journal

Abstract

There is described a process for the preparation of photocon-ductive polymeric films wherein a minor portion (from about 10 to about 25 percent by weight) of the polymeric material present therein is highly oriented and a major portion (from about 75 to 90 percent by weight) of polymeric material is randomly or only slightly oriented. Initially a photoconduc-tive polymeric film is prepared from a blend of major and minor polymer fractions wherein the weight average molecular weight of the minor fraction is at least four times the weight average molecular weight of the major polymer fraction or from

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XEROX DISCLOSURE JOURNAL

PROCESS FOR ENHANCEMENT OF Proposed Classification
MECHANICAL PROPERTIES OF U.S. Cl, 96/1.5
PHOTOCONDUCTIVE POLYMERS mt. Cl. G03g 5/04
William M. Prest, Jr.

There is described a process for the preparation of photocon-
ductive polymeric films wherein a minor portion (from about 10
to about 25 percent by weight) of the polymeric material
present therein is highly oriented and a major portion (from
about 75 to 90 percent by weight) of polymeric material is
randomly or only slightly oriented. Initially a photoconduc-
tive polymeric film is prepared from a blend of major and
minor polymer fractions wherein the weight average molecular
weight of the minor fraction is at least four times the weight
average molecular weight of the major polymer fraction or from

a homopolymer composition wherein the molecular weight dis-
tribution of the polymer is greater than 4 and preferably
greater than 10. The film is thereafter subjected to strain
induced orientation at temperatures of from about 10 30°C in
excess of the softening point of the film thereby resulting in
the orientation of substantially all of the polymeric chains
within the film along the lines of force of the strain. The
film is thereafter allowed to relax for a predetermined inter-
val and then quenched. The relative difference in viscosity
and shear compliance between the high molecular weight and low
molecular weight fractions will cause the low melecular weight
polymer fraction to relax to its equilibrium condition more
rapidly. By properly timing the quenching of the film, it is
possible to "freeze in" orientation of the high molecular
weight polymer fraction and yet allow substantially complete
relaxation of the low molecular weight polymer fraction.

Films prepared according to this process have enhanced mechan-
ical properties and are highly flexible yet retain substan-
tially the same electrical characteristics of ran...