MXPA97001997A - Ftalocianina de hidroxi galio and dimeros de ftalocianina de alcoxi ga - Google Patents

Abstract

The present invention relates to a photoconductive image forming member that includes a support substrate, a photogenerating layer and a charge transport layer, wherein the photogenerating layer comprises a mixture of hydroxy metallphthalocyanine and gallium phthalocyanine dimers bridged with alcohol.

Description

HYDROXY GALIO FTALOCIANIN AND ALCOHOL GALIO FTALOCIANIN DIMEROS FIELD OF THE INVENTION This invention relates to a mixture of (1) phthalocyanine hydroxy gallium and phthalocyanine dimer of alkoxy gallium and (2) an electrophotographic photoreceptor containing the mixture as material generator of charge. BACKGROUND OF THE INVENTION Hydroxy gallium phthalocyanine is useful as a charge carrier generating pigment in electrophotographic photoreceptors. The phthalocyanine pigment of hydroxy gallium is important because of its high sensitivity. The present invention relates to a mixture of phthalocyanine of hydroxy gallium and phthalocyanine dimer of alkoxy gallium as a pigment generating charge. The U.S. Patent No. 5,302,710 issued to Nukada et al. Illustrates a mixed crystal of phthalocyanine comprising a phthalocyanine of halogenated indium and a phthalocyanine of halogenated gallium. Nukada et al. Describe an electrophotographic photoreceptor containing the mixed crystal of phthalocyanine. Mixed glass is prepared by dry grinding and treatment with an organic solvent. Electrophotographic photoreceptors containing the mixed crystal are characterized by improved stability in repeated use. REF: 24134 The U.S. Patent No. 5,418,107 to Nealey et al., Illustrates a process for manufacturing an electrophotographic image forming member, which includes a mixture of pigment particles. The mixture comprises two different vanadyl phthalocyanine pigments. Nealey et al. Illustrate typical mixtures comprising metal-free phthalocyanine and titanyl phthalocyanine particles; phthalocyanine of indium chlorine and particles of titanyl phthalocyanine; and phthalocyanine hydroxy gallium and titanyl phthalocyanine particles. The patent application of the U.S.A. Serial No. 08 / 439,395 co-pending granted to Grammatica et al. Illustrates a mixture of phthalocyanine of TiO (IV) and phthalocyanine of Indian chlorine to achieve a balanced sensitivity. In general, phthalocyanine particles or phthalocyanine particle mixtures are provided for purposes of improved properties over a particular range of sensitivities. Customizing the pigments to particular sensitivity ranges provides compositions that have improved properties for particular photoreceptor applications. For example, some compositions can be employed as charge-generating pigments in photoreceptors that are employed in printers having 780 nm laser diode exposure systems. See request of Patent of the U.S.A. Serial No. 08 / 439,395 granted to Grammatica and collaborators. The present invention is directed to a mixture of crystals that can provide different photoreceptor designs for different applications. The proportions of pigments in the mixture can be varied to provide a range of sensitivities. By changing the proportions of the pigments in the mixture, the mixture can be used in very different applications. A single pigment combination can be provided instead of separate pigment systems previously employed for the different applications. SUMMARY OF THE INVENTION The present invention provides a phthalocyanine pigment comprising a mixture of phthalocyanine hydroxygallium and phthalocyanine dimer of alkoxygallium. The present invention provides an electrophotographic imaging member comprising the mixture of phthalocyanine hydroxygallium and phthalocyanine dimer of alkoxygallium. The present invention provides a pigment that can be adjusted to provide different sensitivities for different applications.

Figure 1 is a cross-sectional view of a multilayer photoreceptor of the invention.

Figures 2 to 4 are impressions test impressions that are provided by electrophotographic image forming members. DESCRIPTION OF PREFERRED MODALITIES The Support Substrate The Support Substrate 2 may be opaque or substantially transparent and may comprise numerous suitable materials having the required mechanical properties. The preferred substrate is an aluminum drum. The substrate can furthermore be provided with an electrically conductive surface (base plane 3). In accordance, the substrate may comprise a layer of an electrically non-conductive or conductive material such as an organic or inorganic composition. Various known resins can be employed as the electrically non-conductive material, including polyesters, polycarbonates, polyamides, polyurethanes and the like. For a strip-like image forming member, the conductive or electrically insulating substrate should be flexible and can have any number of different configurations such as for example a sheet, a roll, an endless flexible band and the like. Preferably, the substrate is in the form of an endless flexible band and comprises a commercially available biaxially oriented polyester known as Mylar. available from E.I. du Pont de Neumours & Company, or Melinex available from ICI Americas Inc. The preferred thickness of the substrate layer depends on numerous factors, including economic considerations. The thickness of this layer may be in the range of about 65 micrometers to about 150 micrometers and preferably about 75 micrometers to about 125 micrometers for optimum flexibility and minimum surface bending stress induced when cycling around small diameter rolls, example rollers with a diameter of 19 millimeters. The substrate for a flexible strip can be of substantial thickness, for example 200 micrometers, or of minimum thickness, for example 200 micrometers or of minimum thickness for example 50 micrometers, provided that there are no adverse effects on the final photoconductor device. The surface of the substrate layer is preferably cleaned before coating to promote greater adhesion of the adjacent layer. Cleaning can be effected by exposing the surface of the substrate layer to plasma discharge, ion bombardment and the like. The Electrically Conducting Basal Plane The electrically conductive basal plane 3 (if required, can be an electrically conductive layer such as a layer of metal that can be formed, for example on the substrate 2 by any convenient coating technique, such as a vacuum deposition technique. Typical metals include aluminum, zirconium, niobium, tantalum, vanadium, hafnium, titanium, nickel, stainless l, chromium, tung, molybdenum and the like, and mixtures and alloys thereof. The conductive layer can vary in thickness over substantially broad ranges depending on the optical transparency and desired flexibility for the electroconductive member. According to this for a flexible photoresponsive imaging device, the thickness of the conductive layer is preferably between 20 angstroms to about 750 angstroms and more preferably from about 50 angstroms to about 200 angstroms for an optimum combination of electrical conductivity, flexibility and transmission of light. Regardless of the technique used to form a metal layer, a thin layer of metal oxide is usually formed on the outer surface of most metals upon exposure to air. In this way, when other layers that overlap the metal layer are characterized as "continuous" layers, it is intended that these superimposed contiguous layers can in fact contact a thin metal oxide layer that has formed from the outer surface of the layer. of oxidizable metal. In general, for post-erasure exposure, a conductive layer light transparency of at least about 15% is convenient. The conductive layer does not need to be limited to metals. Other examples of layers Conductors may be combinations of materials such as conductive indium tin oxide as a light transparent layer having wavelength between about 4000 angstroms and about 9000 angstroms or conductive carbon black dispersed in a plastic binder as an opaque conductive layer. The conductive basal plane 3 can be omitted if a conductive substrate is used. The Caraa Locking Layer After depositing any electrically conductive basal layer, the load blocking layer 4 can be applied. The electron blocking layers for positively charged photoreceptors allow holes in the image forming surface of the receiving photo to migrate towards the conductive layer. For negatively charged photoreceptors, any convenient orifice blocking layer capable of forming a barrier to prevent injection of holes from the conductive layer to the opposite conductive photo layer, may be employed. The blocking layer 4 may include polymers such as polyvinyl butyral, epoxy resins, polyes, polysiloxanes, polyamides, polyurethanes and the like; nitrogen-containing siloxanes, or nitrogen-containing titanium compounds, such as trimethoxysilyl propylethylene diamine, beta- (aminoethyl) gamma-amino-propyl trimethoxy silane, isopropyl aminobenzene sulfonyl titanate, di (dodecylbenzene sulfonyl) titanate, isopropyl di (4-aminobenzoyl) isostearoyl titanate, isopropyl tri (methylamino) titanate, isopropyl triantranil titanate, isopropyl tri (N, N-dimethylethylamino) titanate, 4-amino benzene sulfonate, titanium oxyacetate, 4-aminobenzoate isostearate, titanium oxyacetate , [H2N (CH2-) 4] CH3Si (OCH3) 2 (gamma -ami nobu ti 1 methyl dimethoxy silane), [H2N (CH2) 3] CH3Si (0CH3) 2 (gamma-aminopropyl methyl dimethoxy silane), and [H2N (CH2) 3] Si (OCH3) 3 (gamma-aminopropyl trimethoxy silane) as described in U.S. Pat. Nos. 4,338,387, 4,286,033 and 4,291,110. A preferred orifice blocking layer comprises a reaction product of a hydrolyzed silane or mixture of hydrolyzed silanes and the oxidized surface of a basal plane layer of metal. The oxidized surface is inherently formed on the outer surface of most basal metal sheet layers when exposed to air after deposition. This combination improves electrical stability at low relative humidity. The hydrolyzed silanes that can be employed are hydrolyzed silanes which are well known in the art. For example, see U.S. Pat. No. 5,091,278 issued to Teusher et al. The blocking layer 4 should be continuous and can have a thickness of up to two microns depending on the type of material used. A blocking layer is approximately 0.005 micrometer and approximately 0.3 micrometer is satisfactory due to charge neutralization after the exposure stage is facilitated and good electrical performance is achieved. A thickness between a 0.03 micrometer and a 0.06 micrometer is preferred for blocking layers for optimum electrical performance. The blocking layer 4 can be applied by any convenient technique such as spraying, dip coating, bar coating, engraving coating, stenciling, air gun coating, air knife coating, reverse roll coating, vacuum deposition, chemical treatment and the like. For convenience, to obtain thin layers, the blocking layer is preferably applied in the form of a diluted solution, with the solvent removed after coating deposition by conventional techniques such as vacuum, heating and the like. In general, a weight ratio of the blocking layer and solvent material of between a 0.5: 100 to a 5.0: 100 is satisfactory for spray coating. The Adhesive Layer An intermediate layer 5 between the blocking layer and the charge generating layer or photogenerator may be provided to promote adhesion. However, in the present invention, an immersed aluminum drum is the preferred substrate and is used without an adhesive layer. When a Adhesive layer, can be characterized by a dry thickness between a 0.01 micrometer to a 0.3 micrometer, more preferably at a 0.05 to a 0.2 micrometer. If an adhesive layer is used it can comprise any known adhesive for layers of an electrophotographic image forming member. The adhesive layer may comprise a film-forming polyester resin adhesive such as resin 49,000 from du Pont (available from E.I. du Pont de Nemours &Co.) Vitel 1200 (available from Goodyear Rubber &Tire Co.) or the like. Both the Pont 49,000 and Vitel 1200 adhesive layers provide reasonable adhesion strength and do not produce harmful electrophotographic impact on the resulting imaging member. Another copolyester resin adhesive is available from Goodyear Rubber & Tire Co. as Vitel 2200. This polyester resin is a linear saturated co-polyester of two diacids and two diols. The molecular structure of this linear saturated copolyester is represented by the following: 0 II HOC- (diacid-diol) n-OH wherein the ratio of diacid to ethylene glycol in the copolyester is 1: 1. The diacids are terephthalic acid and isophthalic acid in a ratio of 1.2: 1. The two diols are ethylene glycol and 2, 2-dimethyl propane diol in a ratio of 1.33: 1. The linear saturated copster of Goodyear Vitel 2200 consists of random alternating monomer units of the two diacids and the two diols and has a weight average molecular weight of about 58,000 and a Tg of about 67 ° C. Other suitable copsters include Goodyear Vitel 1710, Vitel 1870, Vitel 3300, Vitel 3550 and Vitel 5833. Vitel 5833 is a short chain branched per having crosslinkable carboxylic acid and hydroxyl functional groups. Vitel 5833 is particularly useful by itself or mixed with other psters in applications that require an increase in the interlacing density of the adhesive layer. The Load Generating Layer The charge generating layer 6 comprises a per binder and a mixture of photoconductive pigments. The photoconductive pigments are a mixture of phthalocyanine of hydroxygallium and a dimer of phthalocyanine of alkoxygallium. The U.S. Patent Application. Serial No. 08 / 169,486, illustrates a process for the preparation of Type V hydroxygalium phthalocyanine. The description of this application is incorporated herein by reference. On request, the Chlorogalio phthalocyanine Type I as a pigment precursor is prepared by reacting from about 10 parts to about 100, preferably about 19 parts of gallium chloride in a solvent such as N-methylpyrrolidone, with 1,3-diiminoisoindole (D13) in amount from about 1 part to about 10 parts, preferably about 4 parts, per part of gallium chloride. The resulting chlorohalite phthalocyanine pigment precursor is hydrolyzed by standard methods. For example, the pigment precursor can be hydrolyzed by acid passaging, wherein the precursor is dissolved in concentrated sulfuric acid and then precipitated in a solvent, such as water, or from a diluted ammonia solution, for example, about 10 to about 15% ammonia. The resulting hydrolyzed hydroxyglyph phthalocyanine pigment is treated in a solvent, such as N, N-dimethylformamide, present in an amount of about 1 part by volume to about 50 parts by volume and preferably about 15 parts by volume per each weight of phthalocyanine hydroxygallium. The pigment is treated with solvent by ball mill in the presence of spherical glass beads, with an approximate diameter of 1 millimeter to 5 millimeters, at room temperature, about 25 ° C, for a period of about 1 hour to about 1 week, preferably for approximately 24 hours. He The treatment produces a Type V hydroxygalium phthalocyanine containing very low levels of residual chlorine from about 0.001% to about 0.1%. Additionally, processes for the preparation of phthalocyanine hydroxygallium are illustrated in copending patent applications Serial No. of the U.S.A. 08 / 413,554 and Serial No. of U.S.A. 08 / 332,304 and in U.S. Patents. No. 5,456,998 issued to Burt et al., No. 5,466,796 issued to Burt et al. And No. 5,493,016 issued to Burt et al. The descriptions of each application and each US Patent. they are incorporated here by reference. Additionally, the Patent of the U.S.A. No. 5,493,016 issued to Burt et al., U.S. Pat. No. 5,466,796 issued to Burt et al., U.S. Pat. No. 5,456,998 issued to Burt et al. And U.S. Pat. No. 5,521,306 issued to Burt et al. Describe alkoxymetal phthalocyanine dimers and their preparations which are suitable in the present invention. The descriptions of these references are incorporated herein by reference. The U.S. Patent No. 5,493,016 issued to Burt et al. Illustrates a process for the preparation of metalophthalocyanine dimers bridged with alkoxy by the reaction of a trivalent metal compound with ortho-phthalodinitrile or 1,3-diiminoisoindole in the presence of a diol. The patent of the U.S.A. No. 5,466,796 illustrates metalophthalocyanine bridged with C 32 H 16 N β M 0 R 0 M N 8 H 16 C 32 alkoxy, wherein M is a metal and R is an alkyl or an alkyl ether. The U.S. Patent No. 5,456,998 issued to Burt et al., Illustrates photoconducting image forming members comprising an alkoxy bridged metalophthalocyanine dimer as a charge generating material, wherein the dimer is of the formula CsjHißNßMOROMNßHißCsa wherein M is a trivalent metal and the R is an alkyl group or an alkyl ether group. The U.S. Patent No. 5,521,306 issued to Burt et al., Illustrates a process for the preparation of phthalocyanine hydroxygallium Type V, which comprises forming on site a gallium phthalocyanine dimer bridged with alkoxy, hydrolyzing the gallium phthalocyanine dimer bridged with alkoxy to hydroxy phthalocyanine and converting the phthalocyanine product of hydroxygalium to phthalocyanine hydroxygalium Type V. Suitable hydroxygalium phthalocyanines and convenient alkoxyglyphthalate phthalocyanines are described in the Patents of Burt et al. identified above and in the US Patent. No. 5,521,306 issued to Burt et al. In particular, the application of Burt et al. Discloses alcoxigalium phthalocyanine dimers of the general formula C32H16NaGa0R0GaNßH16C32 as illustrated by formula 1: FORMULA 1 with, for example from 2 to about 10, and preferably about 2 to 6 carbon atoms in the alkoxy bridging unit (O-R-0), wherein R is an alkyl group or an alkyl ether group. The charge generating layer is formed by coating on a conductive substrate, a coating composition prepared by dispersing the phthalocyanine hydroxygallium and the phthalocyanine dimer of alkoxygallium of the present invention, in a solution of binder resin in an organic solvent.

The ratio of phthalocyanine hydroxygallium to phthalocyanine dimers of alkoxygallium as the pigment depends on the fine adjustment required for an application. In general, proportions by weight from 99: 1 to 1:99 may be used. Preferably, the ratio can be 80:20 to 20:80. Other convenient proportions include 60:40 to 40:60 and 55:45 to 45:55. A formulation ratio of the phthalocyanine mixture to the binder resin is generally in the range of 40/1 to 1/10, and preferably 10/1 to / 1: 4 by weight. If the ratio of the phthalocyanine mixture is too high, the stability of the coating composition tends to be reduced. If it is too low, the sensitivity of the charge generating layer tends to be reduced. The solvents to be used in the coating compositions are preferably chosen from those incapable of dissolving the lower layer, ie the layer in which the load generating layer is applied. Examples of the organic solvents include alcohols, for example methanol ethanol and isopropanol; ketones such as, for example, acetone, methyl ethyl ketone and cyclohexanone: amides, for example N, N-dimethylformamide and N, N-dimethylacetamide; dimethyl sulfoxides; ethers, for example tetrahydrofuran, dioxane and ethylene glycol monomethyl ether; esters for example methyl acetate and ethyl acetate; halogenated aliphatic hydrocarbons, for example chloroform, methylene chloride, dichloroethylene, carbon tetrachloride and trichlorethylene; and aromatic hydrocarbons, for example benzene, toluene, xylene, ligroin, monochlorobenzene and dichlorobenzene. The coating composition for a charge generating layer can be applied by any known coating technique such as dip coating, spray coating, spin coating, bubble coating, wire rod coating, blade coating, roller coating and curtain coating. Preferably the drying after coating is carried out to first dry at room temperature to the touch and then heat-dried. The heat drying can be carried out at a temperature from 20 ° C to 200 ° C for a period of 5 minutes to 2 hours in static air or in an air flow. The charge generating layer usually has a thickness of 0.05 to 5 microns. The Caraa Transport Layer The load transport layer 7 can comprise any suitable transparent organic polymer or non-polymeric material capable of supporting the injection of photogenerated holes or electrons of the charge generating layer 6 and allowing the transport of these orifices or electrons to selectively discharge the surface charge. The load transport layer is not only used to transport holes or electrons but also protects the charge generating layer against abrasion or chemical attack and therefore extends the operational life of the image forming member. The charge transport layer is substantially transparent to radiation in a region in which the image forming member is to be employed. The charge transport layer is normally transparent when exposure is made through it to ensure that most of the incident radiation is used by the underlying charge generating layer. When used with a transparent substrate, exposure or erasure as an image, can be achieved through a substrate with all the light that passes through the substrate. In this case, the cargo transport material does not require transmitting light in the region of wavelength of use. The charge transport layer can comprise activating compounds dispersed in normally electrically inactive polymeric materials, to make these electrically active materials. These compounds can be added to polymeric materials that are incapable of supporting the injection of photogenerated charge and unable to allow the transport of this charge. An especially preferred transport layer used in multilayer photoconductors comprises about 25% to about 75% by weight of at least one aromatic amine compound of charge transport of about 75% by weight. % to about 25% by weight of a polymeric film forming resin wherein the aromatic amine is soluble. The charge transport layer is preferably formed from a mixture comprising one or more compounds having the formula: \ N - R3 / R2 wherein R1 and R2 are selected from the group consisting of substituted or unsubstituted phenyl groups, naphthyl groups, and polyphenylene groups and R3 is selected from the group consisting of substituted and unsubstituted aryl groups, alkyl groups which they have from 1 to 18 carbon atoms and cycloaliphatic groups which have from 3 to 18 carbon atoms. The substituents should be free of groups that withdraw electrons such as N02 groups, Cn groups and the like. Examples of aromatic cargo transport amines represented by the above structural formula include triphenylmethane, bis- (4-diethylamine-2-methylphenyl) -phenylmethane; 4,4'-bis (diethylamino) 2, 2'-dimethyltriphenylmethane; N, N'-bis (alkyl-phenyl) - (1,1'-biphenyl) 4,4'-diamine, wherein the alkyl is, for example, methyl, ethyl, propyl, n-butyl, etc., N, N'-diphenyl-N, N'-bis (3-methylphenyl) - (1, 1-biphenyl) -4,4 '- diamine; and the like, dispersed in an inactive resin binder. Any suitable inactive resin binder soluble in methylene chloride or other suitable solvent may be employed. Typical inactive resins binders soluble in methylene chloride include polycarbonate resin, polyvinylcarbazole, polyester, polyacrylate, polyether, polysulfone, and the like. The molecular weights may vary from about 20,000 to 1,500,000. Other solvents that can dissolve these binders include tetrahydrofuran, toluene, trichlorethylene, 1,2-trichloroethane, 1,1,1-trichloroethane, and the like. Preferred electrically inactive resin materials are polycarbonate resins having a molecular weight of from about 20,000 to about 120,000, more preferably from about 50,000 to about 100,000. The most preferred materials such as electrically inactive resin materials are poly (4,4 / -dipropylidene diphenylene carbonate) with a molecular weight of about 35,000 to about 40,000, available as Lexan 145 from General Electric Company; poly (4,4'-isopropylidene-diphenylene carbonate) with a molecular weight of about 40,000 to about 45,000 available as Lexan 141 from General Electric Company; a polycarbonate resin that has a molecular weight of about 50,000 to about 100,000, available as Makrolon from Farbenfabricken Bayer A.G .; a polycarbonate resin having a molecular weight of from about 20,000 to about 50,000, available as Merion from Mobay Chemical Company; polyether carbonates; and 4,4-cyclohexylidene diphenyl polycarbonate. The solvent methylene chloride is a convenient component of the coating mixture with a charge transport layer for adequate dissolution of all components and its low boiling point. The thickness of the charge transport layer can be in the range of about 10 microns to about 50 microns, and preferably about 15 microns to about 35 microns. Optimal thicknesses can be in the range of approximately 23 micrometers to approximately 31 micrometers. The Basal Strip The basal or ground strip 9 may comprise a film-forming binder and electrically conductive particles. Cellulose may be used to disperse conductive particles. Any suitable electrically conductive particles can be employed in the electrically conductive basal strip layer 9. The basal strip 9 can comprise materials including those listed in Patent of the U.S.A. No. 4,664,995. Typical electrically conductive particles include carbon black, graphite, copper, silver, gold, nickel, tantalum, chromium, zirconium, vanadium, niobium, indium oxide, tin and the like. The electrically conductive particles may have any convenient shape. Typical shapes include irregular, granular, spherical, elliptical, cubic, leaflets, filaments and the like. Preferably, the electrically conductive particles should have a particle size smaller than the thickness of the electrically conductive basal strip layer to avoid an electrically conductive basal strip layer having an excessively irregular outer surface. The average particle size of less than about 10 microns generally avoids excessive projection of the electrically conductive particles on the outer surface of the dry basal strip layer and ensures a relatively uniform dispersion of the particles through the matrix of the outer layer. dry basal strip. The concentration of the conductive particles to be used in the basal strip depends on factors such as the conductivity of the specific conductive particles used. The basal strip layer may have a thickness of about 7 microns to about 42 microns, and preferably about 14 microns to about 27 microns.

The Anti-Blistering Layer The anti-kinking layer 1 is optional and may comprise organic polymers or inorganic polymers that are electrically insulating or slightly semiconducting. The anti-kinked layer provides resistance to abrasion and / or flatness. The anti-kinking layer 1 can be formed on the back side of the substrate 2, opposite the image forming layers. The anti-kink layer may comprise a film-forming resin and an adhesion-promoting polyester additive. Examples of film-forming resins include polyacrylate, polystyrene, poly (4,4 / -isopropylidene diphenyl carbonate), 4,4'-cyclohexylidene diphenyl polycarbonate, and the like. Typical adhesion promoters used as adhesives include 49,000 (du Pont), Vitel PE-100, Vitel PE-200, Vitel PE-307 (Goodyear) and the like. Usually from about 1 to about 15% by weight the adhesion promoter is chosen for addition of film-forming resin. The thickness of the anti-kinking layer is from about 3 microns to about 35 misters and preferably about 14 microns. Anti-kink coating may be applied as a solution prepared by dissolving the film-forming resin and the adhesion promoter in a solvent such as methylene chloride. The solution is applied to the surface backing of the support substrate (the side opposite the image forming layers) of the photoreceptor device by coating or by other methods known in the art. The wet coating film is then dried to produce the anti-kinking layer 1. The Overcoat Layer The optional overcoat layer 8 may comprise organic polymers or inorganic polymers that are capable of transporting cargo through the overcoat . The overcoat layer may be in the thickness range from about 2 microns to about 8 microns, and preferably from about 3 microns to about 6 microns. An optimum range of thicknesses is from about 3 micrometers to about 5 micrometers. The invention is further illustrated in the following non-limiting examples, it being understood that these examples are intended to be illustrative only and that the invention is not intended to be limited to the materials, process parameters and the like described herein. EXAMPLES Table 1 lists various proportions of the mixture of phthalocyanine hydroxygallium and phthalocyanine dimer of alkoxygallium according to the invention. The pigments were dispersed separately and then mixed in the proportion desired. The compositions were evaluated by PIDC sensitivity. The sensitivities are reported in The Table. In the Table, ROGaPc is alkoxyigalium phthalocyanine, wherein R is -0CH2CH20- and HOGaPc is phthalocyanine hydroxygalium. Table 1 Device Proportion dV / dX No. ROGaPc: HOGaPc v cm2 / erg 350VDDR 4238704 100: 0 37 4256702 95: 5 46 4256704 90:10 56 4249705 85:15 68 4249707 70:30 106 4249711 50:50 156 4256706 25: 75 183 4256709 10:90 2Q The following Table 2 shows dV / dX, from a Hewlett Packard LaserJet IIP printer, an Apple Writer Select 360 printer and a Hewlett Packard LaserJet 4 printer. These three printers were selected because they represent printers that require low, medium and high sensitivity photoreceptors. The fact that all three impressions are similar with respect to darkness shows that the sensitivity of the photoreceptor has been adjusted over the entire relevant range of sensitivities.

Table 2 Machine dV / dX P-IIP 58 90:10 56 Apple LW 360 145 50:50 156 HP-4 224 Mixture 10:90 202 Figure 2 of the drawings shows a test print generated on the Hewlett Packard printer. Figure 3 is a test print generated on the Apple printer. The Figure 4 is a test print generated on the printer Hewlett Packard. The print test results demonstrate that formulated blends of two pigments according to the invention allow adjustment of photoreceptor compositions to provide a range of sensitivities. The adjusted photoreceptors are capable of producing impressions comparable with those made using competitive photoreceptors. The results illustrated in the Tables show that the present invention provides variable photosensitive compositions. The proportions of phthalocyanine from hydroxygalium to phthalocyanine from alkoxygallium can be varied as dictated by the sensitivity requirements of a range of applications.

The present invention allows formulating a variety of products by using only two pigments. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, the content of the following is claimed as property:

Claims (24)

1. CLAIMS 1. A phthalocyanine mixture characterized in that it comprises a phthalocyanine hydroxygallium and a phthalocyanine dimer of alkoxygallium.
2. 2. The phthalocyanine mixture according to claim 1, characterized in that it comprises a weight ratio of the phthalocyanine of hydroxygalium to the phthalocyanine dimer of alkoxygallium of 99: 1 to 1:99.
3. 3. The phthalocyanine mixture according to claim 1, characterized in that it comprises a weight ratio of the phthalocyanine of hydroxygalium to the phthalocyanine dimer of alkoxygallium from 80:20 to 20:80.
4. 4. The phthalocyanine mixture according to claim 1, characterized in that it comprises a weight ratio of the phthalocyanine hydroxygallium to the phthalocyanine dimer of alkoxygallium from 60:40 to 40:60.
5. 5. The phthalocyanine mixture according to claim 1, characterized in that it comprises a weight ratio of the phthalocyanine of hydroxygalium to the phthalocyanine dimer of alkoxygallium from 55:45 to 45:55.
6. 6. The phthalocyanine mixture according to claim 1, characterized in that the alkoxygallium phthalocyanine is of the formula: wherein R is an alkyl of 2 to about 10 carbon atoms.
7. 7. An electrophotographic member characterized in that it comprises the phthalocyanine mixture of claim 1.
8. 8. The electrophotographic member according to claim 7, characterized in that it comprises a weight ratio of phthalocyanine of hydroxygallium to the dichlorogenin atomizer of 99% alkoxygallium. : 1 to 1:99.
9. 9. The electrophotographic member according to claim 7, characterized in that it comprises a weight ratio of phthalocyanine of hydroxygalium to the phthalocyanine dimer of alkoxygallium from 80:20 to 20:80.
10. 10. The electrophotographic member according to claim 7, characterized in that it comprises a weight ratio of phthalocyanine hydroxygallium to the phthalocyanine dimer of alkoxygallium from 60:40 to 40:60.
11. 11. The electrophotographic member according to claim 7, characterized in that it comprises a weight ratio of phthalocyanine hydroxygallium to the phthalocyanine dimer of alkoxygallium from 55:45 to 45:55.
12. 12. The electrophotographic member according to claim 7, characterized in that the alkoxyigalium phthalocyanine is of the formula: wherein R is an alkyl of 2 to about 10 carbon atoms.
13. 13. A method for preparing a photosensitive composition characterized in that it comprises mixing a phthalocyanine hydroxygallium and a phthalocyanine dimer of alkoxygallium and forming a photosensitive composition with the mixture.
14. 14. - The method according to claim 13, characterized in that it comprises mixing a weight ratio of phthalocyanine hydroxygallium to phthalocyanine dimer of alkoxygallium from 99: 1 to 1:99.
15. 15.- The method according to the claim 13, characterized in that it comprises mixing a weight ratio of the phthalocyanine of hydroxygalium to the phthalocyanine dimer of alkoxygallium from 80:20 to 20:80.
16. 16. The method according to claim 13, characterized in that it comprises mixing a weight ratio of the phthalocyanine of hydroxygalium to the phthalocyanine dimer of alkoxygallium from 60:40 to 40:60.
17. 17. The method according to claim 13, characterized in that it comprises mixing a weight ratio of the phthalocyanine hydroxygallium to the phthalocyanine dimer of alkoxygallium from 55:45 to 45:55.
18. 18. The method according to claim 13, characterized in that the alkoxygalium phthalocyanine is of the formula: wherein R is an alkyl of 2 to about 10 carbon atoms.
19. 19. A photoconductive image forming member comprising the mixture of claim 1, as a charge generating material.
20. 20. The photoconductive image forming member of claim 19, characterized in that it comprises a weight ratio of the phthalocyanine of hydroxygalium to the phthalocyanine dimer of alkoxygallium from 99: 1 to 1:99.
21. 21. The photoconductive image forming member of claim 19, characterized in that it comprises a weight ratio of the phthalocyanine of hydroxygalium to the phthalocyanine dimer of alkoxygallium from 80:20 to 20:80.
22. 22. The photoconductive image forming member of claim 19, characterized in that it comprises a weight ratio of the phthalocyanine hydroxygallium to the phthalocyanine dimer of alkoxygallium from 60:40 to 40:60.
23. 23. The photoconductive image forming member of claim 19, characterized in that it comprises a weight ratio of the phthalocyanine hydroxygallium to the phthalocyanine dimer of alkoxygallium from 55:45 to 45:55.
24. 24. The photoconductive image forming member of claim 19, characterized in that the alkoxygallium phthalocyanine is of the formula: wherein R is an alkyl of 2 to about 10 carbon atoms.