Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Process of making radiation-sensitive composition
Patent
1993-01-05
1994-12-27
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Process of making radiation-sensitive composition
430134, 430119, G03G 505
Patent
active
053764919
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to photoconductors generally and more particularly to organic photoconductors.
BACKGROUND OF THE INVENTION
Various types of organic photoconductors are known. Most organic photoconductors are susceptible to attack by organic solvents of the type used in liquid toner electrophotography and are therefore unsuitable for such applications. These photoconductors include those which dissolve in the solvents and other which are caused to crack as the result of exposure thereto when they are under stress, especially when under tension.
It is known in the art to provide protective coatings for organic photoconductors. Examples of these coatings are given in U.S. Pat. Nos. 4,891,290 and 4,894,304.
SUMMARY OF THE INVENTION
The present invention seeks to provide an improved organic photoconductor which is resistant to cracking in a stressed environment wherein organic solvents of the type used in liquid toner electrophotography are present.
There is thus provided in accordance with a preferred embodiment of the present invention an organic photoconductor including a base layer formed of a first material and a photoconductive layer formed of a second material, the organic photoconductor being characterized in that when it is maintained in a curved orientation with the photoconductive layer facing outward, the photoconductive layer is subjected to less stress than the base layer. In accordance with a preferred embodiment of the invention the first material is relatively more flexible than the second material. In accordance with an alternative preferred embodiment of the invention the first material is relatively flexible and stretchable and the second material is an initially less flexible and stretchable material, which has been chemically treated to increase its stretchability and flexibility.
There is also provided in accordance with a preferred embodiment of the present invention an organic photoconductor including a base layer formed of a first material and a photoconductive layer formed of a second material, the base and photoconductive layers being pre-stressed in opposite senses.
There is further provided in accordance with a preferred embodiment of the present invention an organic photoconductor including a base layer formed of a first material and a photoconductive layer formed of a second material, the second material being chemically treated to relieve stress therein. In a preferred embodiment of the invention, the chemical treatment causes the photoconductive layer to become more flexible and stretchable. Preferably the photoconductive layer becomes more elastic or plastic.
Additionally in accordance with a preferred embodiment of the present invention there is provided a method for manufacturing an organic photoconductor including the steps of:
providing an organic photoconductor having a base layer and a photoconductor layer, and
treating at least one of the base layer and photoconductive layer to relieve stress in the photoconductive layer.
Additionally in accordance with the above embodiment of the invention, the base layer of the organic photoconductor has greater flexibility and stretchability than the photoconductor layer.
Further in accordance with the above embodiment of the invention, the base layer has a stress relief temperature higher than that of the photoconductive layer.
Additionally in accordance with the preceding embodiment, the step of treating includes the steps of stressing the base layer and the photoconductive layer and while they are stressed, heating them to a temperature between the stress relief temperatures of the base layer and photoconductive layer.
In accordance with an alternative embodiment of the invention, the step of treating includes the step of chemically treating the photoconductive layer to soften and render it more elastic or plastic that it previously was.
Additionally in accordance with a preferred embodiment of the invention there is provided a liquid toner electrophotographic system including a drum, a
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Partial English language translation of German Patent No., 1,906,969.
International Search Report and Annex.
Chatow Ehud
Karin Jakob
Krumberg Yakov
Goodrow John
Indigo N.V.
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