DE2423991A1 - MATCHING THE TRIBOELECTRIC PROPERTIES OF PHOTOCONDUCTIVE INSULATING LAYERS - Google Patents

Description

25 068 n / wa

XEROX CORPORATION, ROCHESTER, N.Y./USA

Matching the triboelectric properties photoconductive insulating layers

The invention relates to a method, an article and a device. More precisely, the invention is concerned with a method of modification or tuning of the triboelectric exchange between toner particles and the imaging surface of an electrostatographic Imaging element. This ability to

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Coordination of the triboelectric exchange between them Materials allows the adaptation of development and cleaning systems originally intended for use designed with a specific photoconductive insulating layer, to other imaging systems that have different Apply photoconductive insulating layers.

In the development of modern "flat paper" copiers it has been necessary to reallocate one or more treatment stations within these devices for better quality copies and higher copy speeds. Often requires replacement of a single element within these highly differentiated devices is an extensive modification of the others Treatment stations. Such extensive modification of these devices is not only with regard to costly in capital outlay, but also results in losses during the period in which the device is removed from the Service is drawn to be adjusted in turn. Hence, there is often an aversion to attempts at improvement of a pre-existing device due to the effects that even minor changes on the various Treatment stations can have within the copier. This is especially true with regard to the replacement one type of potentiometer through another.

The triboelectric relationship between the charged electroscopic Toner particles (used in the development of an electrostatic latent image) and the imaging layer (on which the latent image is formed) is for attraction

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of toner particles during the developer phase of the copy cycle and removal of the toner particles during the transfer and cleaning phases of the copy cycle are critical. Indeed, with the increasing popularity of organic photoconductive polymeric materials and photoconductive binder photos, it would be very beneficial to be able to locate or identify a photoconductive insulating material or a binder layer which has inherent triboelectric properties to those of a photoconductive insulating layer currently in use , commercially used copier systems, since such a photoconductor would likely be very compatible with the other existing processing stations in such an apparatus. Alternatively, the ability to modify or tune the inherent triboelectric properties of a photoconductive insulating layer to approximate those of a commercially used photoreceptor would also be beneficial.

The invention is therefore based on the object of the above and to eliminate the associated disadvantages of the prior art.

In particular, it is the main object on which the invention is based a method of modifying the inherent triboelectric properties of a photoconductive insulating layer to accomplish.

The invention is further directed to providing a method for tuning the triboelectric properties

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a photoconductive insulating layer to approximate that of a pot conductor used in a commercial electrostatographic copying system is applied.

Another object of the invention is to provide a method for tuning the triboelectric Properties of an organic photoconductive polymeric material to approximate the triboelectric properties seen from amorphous selenium.

Another object on which the invention is based is to create a method for tuning the triboelectric Properties of a photoconductive binder layer to approximate the triboelectric properties of amorphous selenium.

Other objects of the invention include providing organic photoconductive polymer materials and photoconductive binder systems, the triboelectric Have properties that are common to amorphous selenium and the application of these photoconductive materials in are comparable to an electrostatographic imaging system.

The above-mentioned and related tasks are achieved by creating a method to modify the triboelectric properties the photoconductive imaging layer of an electrostatographic Imaging element met, wherein the method includes the incorporation of an effective modifying amount of a fluorinated resin into the matrix of the photoconductive imaging

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layer and / or the deposition of the fluorinated resin on the surface of the imaging layer comprises. Particularly preferred fluorinated resins that can be added to such photoconductive insulating layers fluorinated epoxy resins and fluorinated acrylic resins.

Fig. 1 is an elevation in vertical cross-section through an apparatus used in evaluating the triboelectric properties of an electrostatographic imaging element is applied.

Fig. 2 provides a graphical illustration of the comparison is ¹ shift of the triboelectric properties of an imaging layer as a function of the concentration of the fluorinated resin.

According to the inventive method, the triboelectric Properties of the imaging layer of an electrostatographic Modified the imaging element by including therein sufficient fluorinated resin to produce the triboelectric Shift properties of the layer to the desired extent. The degree of modification required varies depending on the inherent triboelectric properties of the photoconductive insulating layer, the relative ones triboelectric properties of the development of an electrostatic latent image, which is on the Layer is formed, toner used to counteract the accumulation of remaining toner on the imaging layer the techniques used (if any) and the relative effectiveness of the cleaning method or device, those for the removal of the remaining or lagging

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Toner from the imaging layer is provided.

The photoconductive imaging layer of the electrostatographic imaging element can comprise an organic photoconductive polymeric material or a photoconductive binder system wherein photoconductive molecules or particles are dispersed in a film-forming insulating resin. Typical of the organic polymers whose triboelectric properties can be tuned by the incorporation of a fluorinated resin include the polyvinyl carbazole, polyvinyl pyrene, anthracenic polymers and their charge transfer complexes. The aforementioned photoconductive binder systems may comprise one or more particular types of photoconductive particles dispersed in one or more film-forming insulating resins. Representative examples of the inorganic photoconductive particles suitable for use in such binder systems include sulfur, selenium, zinc sulfide, zinc oxide, zinc cadmium sulfide, zinc magnesium oxide, cadmium selenide, zinc silicate, calcium stronium sulfide, cadmium sulfide, mercury iodide sulfide, mercury iodide sulfide, mercury iodide sulfide. Arsenic disulfide, arsenic trisulfide, arsenic triselenide, antimony trisulfide, cadmium sulfoselenide and mixtures thereof. Organic photoconductive materials suitable for use in such make layers include: quinacridone pigments; Phthalocyanine pigments; Triphenylamine; 2,4-bis (4,4'-diethylaminophenyl) -1,3,4-oxadiazole; N-isopropylcarbazole; Tri-phenylpyrrole; 4,5-diphenylimidazolidinone; 4,5-diphenylimidazolidine ethione; 4,5-bis (4-amino ^t-phenyl) -imidazolidion; 1,5-dicyanonaphthalene; 1,4-dicyanonaphthalene; Aminophthalonitrile; Nitrophthalodinitrile; 1,2,5 * 6-tetraazacyclooctatetraene (2,4,6,8); 2-mercaptobenzothiazole-2-phenyl-4-diphenyldenoxazolone;

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6-hydroxy-2,3-di (p-methoxyphenyl) -benzofurans 4-dimethylaminobenzylidene-benzhydrazide; 3-benzylidene; Aminocarbazole; Poly-N-vi-nylcarbazole; (2-nitro. -Benzylidene) -p-bromanilinj 2, ^ - diphenyl-quinazene in; 1,2,4-triazine; !, S-diphenyl ^ -methyl-pyrazoline; 2- (4 ^L -dimethylaminophenyl) benzoxazole; 3-Amino-carbazole and mixtures thereof.

That in the dispersion of the above-mentioned photoconductive Materials applied to film-forming insulating resin can be any of the usual thermosetting or thermoplastic Represent materials commonly employed with such photoconductive pigments. Typical such Materials are epoxy resins, polyvinyl chloride, polyvinyl acetates, polystyrene, polystyrene-polybutadiene copolymers, polymethacrylate, Polyacrylic compounds, polyacrylonitriles, silicone resins ^ chlorinated rubbers, phenoxy resins, phenolic compounds or resins, epoxy-ghenol copolymers, epoxy-urea-formaldehyde copolymers, Epoxy-melamine-formaldehyde resins, polycarbonates, Polyurethanes, polyamides, saturated polyesters, unsaturated polyesters that are cross-linked with vinyl monomers, and their mixtures.

The one used to modify the triboelectric properties Fluorinated resins applied to the imaging layer of an electrostatographic imaging member can include any under represent a certain number of fluorinated polymer resins capable of being added to an imaging layer Modification of ■ the triboelectric properties of the layer to evoke. The extent of such modification will depend on the relative concentration of the fluorinated resin in the imaging layer and the relative triboelectric

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Properties of the resin dependent. These resins are generally present in the photoconductive imaging layer in amounts which range anywhere from about 1 to about 50 wt. #, Preferably at a concentration in the range of about 5 to 25 wt.%. The preferred concentration is generally determined by empirical testing.

Representative examples of the preferred fluorinated resins suitable for use in the process of the present invention include fluorine-modified epoxy resins, fluorine-modified alkyd resins, fluorine-modified polyester resins, fluorine-modified melamine resins, fluorine-modified acrylic resins, fluorinated diol polyesters (described in U.S. Patent 3,240,800), fluorochemically modified ones Urethanes comprising acrylate and methacrylate esters modified by fluoro-aliphatic acid condensates and their copolymers (described in US Pat. No. 2,803,615). Many other known fluorinated resins can also be used in the process of the present invention, including fluoro-azirine polymers and copolymers (described in U.S. Patent 3,255,157); Perfluoroalkyl-trifluoromethacrylate copolymers (described in BE-PS 685 486); Fluorocarbon polyether (disclosed in U.S. Patent 3,358,003); polymers derived from fluoro: ketones, described by AG Pittman et al in J. Polymer Science AI , Volume 4, pages -26, 37-47, 1966 and Ibid, Volume 6, 1729-40, 1968; and other fluorine-containing polymers such as fluorinated vinyl polymers, condensation polymers and styrene polymers, as described by W. Postelnek et al in Advances in High Polymer Research, Volume 1 at pages 75 to II3, 1958.

In addition to their ability to modify the tribo-

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electrical properties of the photoconductive imaging layer impart many of the preferred fluorinated resins such layers also have other favorable properties.

For example, many of these have preferred fluorine resins decreased surface energies, which leads to the transfer and cleaning of the toner particles from the surface of the Imaging layer is further facilitated. In addition, these materials are relatively insensitive to changes the ambient humidity and show good stability under oxidative conditions.

The fluorinated polymers which can be used in the process of the invention are of the better known fluorocarbon resins, such as polyvinylidene fluoride (commonly referred to as "Kynar" or "Tedlar"), in view of their relatively good properties Compatibility with their non-fluorinated polymeric analogues varies. You can therefore enter the imaging layer more easily an electrostatographic imaging element without adversely affecting either its mechanical or electrical properties are introduced. Some of the fluorinated polymers useful in this process are capable of crosslinking with themselves and with the other resins in the imaging layer, thereby increasing the mechanical properties (e.g. hardness, abrasion resistance, etc.) of such imaging layers is promoted.

The electrostatographic imaging elements with the triboelectrically modified imaging layers according to FIG Invention can be accomplished by forming a substantially uniform coating from a mass

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produced using the materials listed above contained in their appropriate relative proportions on a suitable conductive substrate. In the case of imaging elements that are provided with an imaging layer, which are an organic photoconductive polymer material, the triboelectric modifying fluorinated Resin is merely added to a fluid vehicle containing the polymeric material and the resulting Solution is sprayed, drawn down, or dip coated onto a conductive substrate. Similar procedures are used at the production of photoconductive binder layer systems carried out. Sufficient photoconductive mass must be applied on the conductive substrate to the substrate to impart a substantially uniform coating having a dry film thickness in the range of about 1 to 50 microns and preferably a thickness in the range of about 5 to 25 microns represents. The conductive substrates to which such a compound is applied can be any of the conventional used in electrophotography: these include the typical stainless steel, aluminum, chrome, Tin oxide coated or carbon binder coated Glass and an aluminizing or conductive resin treated polyethylene terephthalate film. After application of the photoconductive composition on the conductive substrate, the imaging layer is allowed to harden or dry until it is essentially free of residual solvents. This process can be carried out by applying the coated substrate accelerated in a vacuum oven for a relatively short period of time (generally less than 24 hours).

In addition to the introduction of this triboelectric

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Modified, fluorinated resins directly into the imaging layer is also the deposition of these resins as a coating or coat on a pre-formed imaging layer possible. This coating or jacket can be any of the The above-mentioned coating techniques which are used in the production of the imaging layer are applied and renewed periodically when worn. The dry thickness of such a coating can be in the range from about 0.5 to 5 microns (this range is suitable for conventional xerography) or can be a thickness comparable to that of the photoconductive insulating layer (this range is for the application of electrophotographic processes described in U.S. Patents 1,165,404 and 3,234,019).

After making the triboelectrically modified electrostatographic Imaging element, its triboelectric properties on a device of the described in FIG. 1 Type valued. In Fig. 1, a triboelectrically modified imaging element 1 is described, which a triboelectrically modified imaging layer 2 on a conductive substrate 3 comprises. When the grounded, rotating When the fiber brush 4 sweeps over the triboelectrically modified imaging element, it creates a triboelectric current that can be measured with the measuring unit 5. the triboelectrically modified imaging layer is sufficient conductive to prevent the passage of such currents from the surface of the imaging layer to the receptacle to allow. In this way it is possible to add a large number of triboelectrically modified imaging elements evaluate and their triboelectric properties with those

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of commercially available photoconductive imaging elements.

The turboelectrically modified AbM 1 training elements that as described above can be used in any of a variety of electrostatographic imaging processes can be applied. In such methods, the surface of the ferroelectrically modified imaging layer is first sensitized by applying a substantially uniform electrostatic charge to their surface. To that Any of a variety of known techniques can be used to impart this electrostatic charge to an imaging member will; these methodologies generally rely on corona electrode sensitization, or rubbing charge back with a fiber brush or fabric. After the imaging surface of the electrostatographic The illustration element has been sensitized to this a latent image by selective exposure or irradiation of this sensitized layer by activating electromagnetic Energy is formed, as a result of which the charge is selectively consumed in the regions of the film struck by the light thereby forming an electrostatographic latent image.

In the event that the imaging process makes use of a coated photoreceptor, wherein the thickness of the coating is comparable to the thickness of the photoconductive insulating layer, the formation of the latent image can be achieved, as it is in GB-PS 1 165 ^ 05 (transferred to Cannon Camera Co., Inc., Japan). According to the Cannon process

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the free surface of the shutter element becomes in the dark pre-charged to a positive potential by means of a corona electrode, selectively activating electromagnetic radiation Simultaneously exposed to AC corona charge and a latent image on the free surface of the Photoreceptor induced by deck exposure or irradiation in or by activating electromagnetic radiation. The latent image formed in any of the foregoing methods can be processed by colored electroscopic development Toner particles are made visible. Such development can take place directly on the imaging element or the latent image can be transferred to and developed on a receiving sheet. When the latent image develops it can become permanent on the photoconductor surface or fixed to the receiver sheet by solvent or thermal fusion methodologies. In general if the electrostatographic imaging element is to be reused in a cyclic imaging system, the developed image transferred to a receiving sheet before fixing. After the transfer of the developed toner image becomes the imaging layer of the electrostatographic imaging element of remaining toner particles before reuse in a second copy cycle cleaned. This is generally done by applying a neutralizing Charge to the imaging layer and subsequent mechanical removal of the toner remaining on the imaging surface is achieved.

The following examples define, describe, and illustrate the production, use and evaluation of triboelectrically modified electrostatographic imaging

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elements according to the invention. The in the following specific embodiments of the invention are not specific Conditions and devices cited represent either standard methodologies or devices or have been made above described. The parts and percentages given in the examples are in weight, unless otherwise stated, designated.

Example I.

To create a standard against which the triboelectrically modified electrostatographic imaging elements ge. According to the invention, a conventional xerographic plate, which has an amorphous selenium imaging layer, is evaluated on the device indicated in FIG. 1. The rotating brush used in this and all subsequent evaluations comprised bleached and laundered # 5 denier rayon flat fibers, about 1.6 cm (5/8 inch) fiber length and about 35,000 fibers / 6.45 fiber density cm (sq in). These fibers, held in a sliding, grounded cylindrical holder about 8.9 cm (^ 1/2 inches) in diameter, wipe the imaging layer of the electrostatographic imaging member at a rotational speed of 2.6 rpm. with an interference of about 0.25 cm (0.1 inches). Such an evaluation is carried out under ambient conditions (35 to 45 % relative humidity and 22 to 24 ° C / ~ "\" \ 2. To 75 ° F_7). The symbol convention adopted for this evaluation is such that

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a positive current flowing from the brush to the plate is referred to as triboelectric "positive". Thus pulls a material that is triboelectrically more positive than the rayon buridbe is a positive current and vice versa.

The selenium based photoconductor (Xerox Type "E" flat plate) evaluated by this methodology shows a negative Tribo current of about 0.6 to 0.7 x 10 ~ Ampeie. This value is apparently independent of the thickness of the selenium imaging layer. A second imaging element having an imaging layer comprising a metal-free phthalocyanine pigment (as described in U.S. Patent RE 27,117) in an epoxy binder - in a weight ratio of pigment to binder of 1: 11 - is evaluated under identical conditions and shows a positive tribo current of about 37 X-10 "amps. as a result of this sharp imbalance between the tribo currents of these two dissimilar imaging elements It is not surprising that the same development ^ and purge system that used selenium photoreceptors works effectively, a so-called "toner filming" on the surface of a phthalocyanine binder layer.

In evaluating some of the electrostatographic imaging elements according to the invention it may be necessary to postpone such an assessment until the imaging layer has "broken". The initial effect of the Rayon brush against the plate can "polish" the plate, which affects the triboelectric response can. Such a polishing effect manifests itself - when it is present - as a change in the

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generated current and / or a change in the sign of the current during the first several seconds if the Brush across the surface of the imaging layer. In the event that this polishing is found, it should idle the plate for several hours before attempting such a rating again be left. After this rest period, the polished plate tribo current should be fairly constant after triboelectrification be with the rayon brush.

Examples II to VIII

It becomes a series of photoconductive binder layers composed of a photoconductive pigment and a mixed resin binder generated. Such plates are made by dispersing the appropriate relative concentration of photoconductive Pigment and binder in 400 parts by weight of ethyl cellosolie and draw-coating the resulting slurry made on cleaned aluminum plates. After this photoconductive mass is applied to the aluminum substrate the imaging element is heated in a vacuum oven at 160 ° C for a period of 16 ° C Hardened hours. A sufficient amount of the photoconductive composition is applied to the substrate to form an imaging layer that has a dry film thickness of about 8 to about 10 microns. The following table illustrates the shift in tribo flow with increasing concentrations of the fluorinated epoxy resins.

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Binder mass

Example - ^ Epoxy- ** fluorine game Phenol epoxy no. Resin (gm) resin (gm)

Photoconductive pigment

I. 20.0 0.0 II 21.5 0.5 III 21.0 1.0 IV 20.5 1.5 V 20.25 1.72 VI 20.0 2.0 VII 17.75 2.25 VIII 19.5 2.5

X-Porm by
metal-free
Phthalocya
nin (gm) Tribo current
(in units
of 10-lOamps) 2.0 +57 2.0 +26 2.0 +30 2.0 +10 ' 2.0 -15 2.0 - 4th 2.0 -26 2.0 -22

* The epoxy phenolic resin is a mixture of 355 parts by weight epoxy resin (Epon 1007 available from Shell Chemical Co. - 100 % pesticide content); 200 parts by weight phenolic resin (Resyn 5201 - Resyn Corporation - 75 % pesticide content); and 44 parts by weight of urea-formaldehyde resin \ Uforrait P -240- Rohm and Haas Inc. - 60 % pesticide content).

** The fluorine epoxy resin is a highly fluorinated epoxy resin available from 3M, solids content 100 %, elemental fluorine content 22% by weight - this resin is believed to be the same as that used in US Pat. No. 3,255,131 is described.

From the table above it can be seen that as the concentration of epoxyphenolic resin increases by the Substitution with a fluorinated epoxy resin is displaced, the triboelectric properties of the plate increasing become negative, whereby an approach to the triboelectrical

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Irish properties of amorphous selenium (tribocurrent of 0.6 10 "° amps). Figure 2 is a graphical illustration of this shift in the triboelectric properties of phthalocyanine binder panels. When the percentage of fluorinated epoxy resin in the binder is greater than about 20 wt.% increases, the Phthaloeyanin binder plates assume triboelectric properties, which correspond approximately to the triboelectric properties of amorphous selenium.

Examples IX to XVI

The procedures of Examples II through VIII were followed with analogous materials to illustrate the general applicability of the concept. The Potolejt is 2.5 bis (p-diethylaminophenyl) 1,3 * 4-oxadiazole, described by Neugebauer et al, US Pat. No. 3,189,447. The non-fluorinated binder is an acrylic compound (Lucite 2046, Du Pont , a copolymer of equal parts of n- and isobutyl methacrylates). The fluorinated binder is a polymer of perfluoromethyl methacrylate. The results of the tribo measurements on these coatings are analogous to those in Examples I to VIII: With the increase in the proportion of the fluorinated polymer, the measured triboelectric charge current shifts increasingly from strongly positive to strongly negative values. Accordingly, an optimal composition can be selected to obtain the desired properties of the photoreceptor. When it comes to the properties of selenium this particular charging device

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a value close to zero would be optimal.

Examples XVII to XXII

The experiments of Examples IX through XVI were repeated using the photoconductive pigment Quindo Magenta, a quinacridone of the type generally described by Tulagin in U.S. Patent 3,667,945. The blend of normal and fluorine-modified acrylic polymers in those examples is represented by a series of copolymers of

^C n ^F (2 n + 1) "^ - 0 - C - C = CH ₂ and

C 3

^C n ^H (2 n + 1) " ^CH 2 -O-C-C = CH ₂

CH,

of the type described in BE-PS 685 486 (Geigy AG). It is again found that as the percentage of fluorine-modified polymer increases, the tribostrotn is increasingly shifted to the negative side. This example demonstrates that copolymers of normal and fluorine modified Monomers instead of polymer mixtures of analogous compositions while fulfilling the tasks according to the invention

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finding can be used.

Example XXIII

The experiment of Example XXII is repeated with a coating which consists of the binder composition of Example VIII, 2.5 g of fluorine-epoxy resin in 19 * 5 g of epoxy-phenolic resin. It is now found that the Tribostrora is reversed, i.e. strongly negative towards selenium (about -15 x 10 "amps).

Example X>: iV

The experiment of Example XXII is carried out with a coating of an intermediate product composition as used in Example VI 20.0 g epoxy phenolic resin with 2.0 g fluorine epoxy resin - repeated. The tribo current measured by the same methodology is determined to be 0.0 + 1.0 χ 10 "amps, i.e. it is practical identical to that of selenium. It follows that the tribological properties of coated as well as binder P / C Panels can be tailored or "cut" to the properties of a arbitrarily selected reference photoconductor such as selenium.

Example XXV to XXVII

The procedures of Examples II to VII are repeated with the exception that the X-form of the metal-free

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Phthalocyaninepigmetes is replaced by the following photoconductive materials. Either way, the focus will be of the photoconductor set for optimal behavior. Usually the relative concentration of Pigment to binder ranging from about 3 to about 50 Vol. #

Photoconductor

XKV 'Trxgonal selenium pigment

XXVI triphenylamine

XXVII cadmium sulfide

XXVIII Poly (N-vinylcarbazole) particles

Example XXIX

An imaging element comprising an imaging layer the X-met & ll-free phthalocyanine in an epoxy binder is produced in the manner described in Example I. The dry film thickness of the resulting imaging layer is about 15 microns. The free surface of the The imaging layer is then coated with a 12 micron coating of the binder composition (less pigment) of the example II provided. Evaluation of the coated photoreceptor with the apparatus shown in Fig. 1 indicates a tribo (Re ibuiigs) current value for this photoreceptor of +25 x 10 " Amps on. This value is almost equivalent to that of the photoreceptor of Example II where the fluorinated resin is directly used is inserted into the imaging layer. The repetition

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this procedure with coatings made from the binder masses of Examples III through VIII shows a similar correspondence of modification of triboelectric properties the imaging layer.

AtSDiel XXX

The phthalocyanine binder plate of Example I is charged in the dark by charging with a corona electrode a negative potential of about βΟΟ V sensitizes. This The sensitized element is then selectively exposed to an image of light and shadow, and then the resulting image latent image visualized by development with colored electroscopic toner particles specific for are prepared for use with amorphous selenium photoreceptors. The toner transfer and cleaning are done with systems which are also designed for use with amorphous selenium. After a few copy cycles it will be determined that there is toner residue on the imaging surface of the imaging element accumulate and the copy quality begins to deteriorate.

Example XXXI

The electrostatographic imaging member formed in the manner described in Example VIII is made in the Sensitized in the dark by charging with a corona electrode to a negative potential of about 600 V. This

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sensitized element is then selectively a light and shadow image exposed and the resultant latent image by development with the same type of electroscopic toner particles used in Example XXX were made visible. The toner transfer and the Purges are also performed on the same systems used in Example XXX. The copy quality is superior to that obtained in Example XXX and it is found that there was no toner on the imaging surface of the imaging element for an equivalent number of copy cycles.

The concept on which the invention is based can be applied in the same way to non-photoconductive dielectric coatings, like those used for electrographic recording, TESI mapping and the like can be used. In general, the charging characteristics can be more molded or precipitated films through the measured addition of phase-compatible fluoropolymers to non-fluorinated polymers can be set.

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Claims (1)

Patent claims 1. Process for modifying the triboelectric properties of the photoconductive imaging layer electrostatographic imaging element, characterized in that one is in the layer incorporates a triboelectric modification effective amount of a phase compatible fluorinated resin. 2. The method according to claim 1, characterized in that the fluorinated resin from the group consisting of epoxy resin, alkyd resins, polyester resins, melamine resins, acrylic resins and their mixtures select. 5. The method according to claim 1, characterized in that the photoconductive imaging layer comprises a photoconductive pigment, which in a film-forming insulating resin. 4. The method according to claim 1, characterized in that g e k e "n η, that the photoconductive component of the triboelectrically modified photoconductive imaging layer Particles of selenium, zinc oxide, cadmium sulfide, arsenic triselenide, poly-N-vinylcarbazole, phthalocyanine pigments and mixtures thereof. 5. The method of claim 1 wherein the photoconductive imaging layer is an organic photoconductive polymeric material includes. 409851/0996 -25- 6. The method of claim 1 wherein the photoconductive imaging layer contains from about 1 to about 50 percent by weight fluorinated resin. 7. The method of claim 1 wherein the photoconductive imaging layer contains about 5 to 25 percent by weight fluorinated resin. 8. / Triboelectrically modified electrostatographic .Figure element, characterized by a conductive substrate which, in operative arrangement with respect to at least one of its surfaces, has a has triboelectrically modified photoconductive imaging layer, which has an incorporated therein, for triboelectrically Modification effective amount of a phase compatible fluorinated resin. 9. imaging element according to claim 8, characterized in that g.e k e η η, that the fluorinated resin is made from the epoxy resins, alkyd resins, polyester resins, melamine resins . and their mixtures existing group is selected. 10. The imaging element of claim 8 wherein the photoconductive imaging layer comprises a photoconductive pigment in a film-forming one includes insulating resin arranged. 11. The imaging element of claim 8, characterized in that the photoconductive component - 26 - 409851/0996 the triboelectrically modified photoconductive Image layer particles of selenium, zinc oxide, cadmium sulfide, Arsenic triselenide, polyvinyl carbazole, phthalocyanine pigments and mixtures thereof. 12. Imaging element according to claim 8, characterized in that that the photoconductive imaging layer an organic photoconductive polymeric material includes. Ij5. The imaging member of claim 11 characterized in that the photoconductive imaging layer contains from about 1 to about 50 weight percent fluorinated resin. 14. The imaging element of claim 12, characterized in that the photoconductive imaging layer contains about 5 to 25 weight percent fluorinated resin. 15. Electrostatographic imaging process, characterized by (a) Providing or creating a triboelectrically modified imaging element that is a conductive Comprises substrate that is in effective arrangement with respect to at least one of its surfaces a triboelectrically modified photoconductive imaging layer which herein includes one for triboelectric modification effective amount of a phase compatible fluorinated resin incorporated therein, and - 27 409851/0996 (b) Formation of an electrostatic latent image on the imaging surface of the triboelectric modified photoconductive imaging layer. 16. The method according to claim 15, characterized in that g e k e η η ζ e reject "that the fluorinated resin from the from epoxy resins, alkyd resins, polyester resins, melamine resins, Acrylic resins and their mixtures existing group is selected. 17. The method according to claim 15, characterized in that g e k e η η - ζ e i without the photoconductive image happening contains a photoconductive pigment arranged in a film-forming insulating resin. 18. "The method according to claim 15, characterized in that the photoconductive component of the triboelectric modified photoconductive imaging layer comprises particles of selenium, zinc oxide, cadmium sulfide, arsenic triselenide, poly-N-vinylcarbazole, phthaloeyanine pigments and mixtures thereof. 19. The method according to claim 15, characterized in that g e k e η η drawing η e t that the photoconductive imaging layer is an organic photoconductive polymer material includes. 20. The method according to claim I5 characterized ge ken η drawing net. That the fotoleitfahige imaging layer comprises about 1 to about 50 wt. Fo fluorinated resin. • - 28 - 40985170.996 21. The method according to claim 15, characterized in that the photoconductive imaging layer contains about 5 to 25 Gevr.p fluorinated resin. 22. Process for modifying the triboelectric properties a photoconductive imaging layer electrostatic imaging element, characterized by the deposition of a triboelectric Modification of the effective amount of a fluorinated resin on the imaging surface of the imaging layer, 27). The method of claim 22, characterized in that the deposit is in the form of a substantially uniform film having a thickness of about 0.5 to about 50 microns. 2Pr. The method of claim 22, characterized in that the fluorinated resin is selected from the group consisting of epoxy resins, alkyd resins, polyester resins, melamine resins, acrylic resins and mixtures thereof. 25. The method according to claim 22, characterized in that the photoconductive imaging layer a photoconductive pigment ^ ümfasst in a film-forming insulating resin. 2β. A method according to claim 22, characterized in that the photoconductive components the triboelectric. modified photoconductive Image layer particles of selenium, zinc oxide, cadmium - 29 40985 1/0996 ■ · '■■ - 29 - sulfide, arsenic triselenide, poly-N-vinylcarbazole, phthalocyanine pigments and mixtures thereof. 27. The method of claim 22 wherein the photoconductive imaging layer is an organic photoconductive polymeric material represents. 28. Triboelectrically modified electrostatographic.es Imaging element characterized by a conductive substrate that is in operative order a triboelectrically modified photoconductive imaging layer with respect to at least one of its surfaces contains, the imaging surface of the layer having a deposition effective for triboelectric modification a fluorinated resin is provided. 29. Imaging element according to claim 28, characterized in that the deposition is in the form of a There is a substantially uniform film having a thickness of about 0.5 to about 50 microns. 30. Figure element according to claim 28, thereby g e k e η η ζ ei c h η e t that the fluorinated resin is made from Epoxy resins, alkyd resins, polyester resins, melamine resins, acrylic resins and mixtures thereof is. 31. Imaging element according to claim 28, characterized in that g e k e η η · ζ ei c h η e t> that the £ otoconductive components the triboelectrically modified photoconductive - 30 Ά0985IVO 996 Image layer particles of selenium, zinc oxide, cadmium sulfide, Arsenic triselenide, poly-N-vinylcarbazole phthalocyanine pigments and mixtures thereof. j52. The imaging element of claim 28 wherein the photoconductive imaging layer comprises a photoconductive pigment disposed in a film-forming insulating resin. 33 · Imaging element according to claim 28, characterized in that it is η η ζ e i eh η e t that the photoconductive imaging layer is an organic photoconductive polymeric material represents. 3 ^. Electrostatographic imaging process characterized by (a) Provision or creation of a triboelectrically modified electrostatographic imaging element, which comprises a conductive substrate which is in operative arrangement with respect to at least one of its surfaces has a triboelectrically modified imaging layer, the imaging surface of the layer having a deposition effective for triboelectric modification a fluorinated resin is provided, and (b) Formation of an electrostatic latent image on the imaging surface of the triboelectric modified imaging layer. -31-409851 / 0996 '■■■■ .- 31 - 35 · Method according to claim 34, characterized in that g e k e η η sign η e t that the deposit is in the form of a substantially uniform film with a thickness of about 0.5 Ms about 50 microns (/ rev). 36. The method according to claim 34, characterized in that the fluorinated resin from the made of epoxy resin, alkyd resins, polyester resins, melamine resins., Acrylic resins and their mixtures are selected from the group consisting of 3öt. 37. The method according to claim 3 ^, characterized in that g e k e η η - ζ e i c h η et that the photoconductive imaging layer comprises a photoconductive binder system. 38. The method according to claim 3 ^, characterized in that the photoconductive components the triboelectrically modified photoconductive imaging layer particles of selenium, zinc oxide, cadmium sulfide, Arsenic triselenide, polyvinyl carbazole, phthalocyanine pigments and mixtures thereof. 39 · The method according to claim 3 ^ * characterized in that the photoconductive imaging layer is an organic photoconductive polymeric material represents. 409851/0996