摘要:
A method for forming an electrophotographic imaging member comprising electrochemically depositing amorphous selenium on a conductive substrate while simultaneously illuminating the substrate with electromagnetic radiation through a periodic spatial light modulating means. The deposited selenium layer has a periodically varying thickness. The selenium layer is then overcoated with a layer of a charge carrier transport material which is capable of transporting at least one species of charge carrier. The resulting imaging member has extended range and solid area reproduction capability.
摘要:
There is described a novel method for forming a photoreceptor which includes a photogenerator layer comprising selenium and tellurium. According to the method, the photogenerator layer is formed by electrochemically codepositing selenium and tellurium onto a substrate from a solution of their ions in such a way that the relative amounts of selenium and tellurium which are deposited are controlled by their relative concentrations in the electrolyte and by the choice of electrochemical conditions, i.e., current density or electrode potential. Subsequently a layer of a material capable of transporting at least one species of charge carrier is deposited on the free surface of the photogenerator layer by any suitable technique.
摘要:
There is described a method for forming a photoreceptor wherein a substrate having a thin electrically insulating oxide film on a surface thereof is subjected to an electroless deposition step from a selenious acid solution whereby the oxide film is dissolved and a thin selenium layer is formed on the substrate. In one embodiment, a relatively thick photoconductive insulating layer comprising selenium or alloys thereof is deposited by vacuum evaporation over the previously electrolessly deposited selenium layer. In another embodiment, a layer of a charge carrier transport material is deposited over the selenium layer. In a preferred embodiment of the invention, an oxide-free substrate is initially subjected to an electrochemical oxidation step in an alkaline medium to form a thin electrically insulating oxide film on the surface thereof.
摘要:
An allyloxymethylatedpolyamide composition is disclosed, the allyloxymethylatedpolyamide being represented by Formulae I and II: ##STR1## wherein: n is a positive integer sufficient to achieve a weight average molecular weight between about 5000 and about 100,000,R is an alkylene unit containing from 1 to 10 carbon atoms,between 1 and 99 percent of the R.sub.2 sites are --H, andbetween 1 and 99 percent of the R.sub.2 sites are --H, and the remainder of the R.sub.2 sites is between 25 percent and 99 percent --CH.sub.2 --O--(CH.sub.2).sub.w --CH.dbd.CH.sub.2, whereinw is 1, 2 or 3,between 1 and 75 percent of the R.sub.2 sites are --CH.sub.2 --O--R.sub.5, andR.sub.5 is an alkyl unit containing 1 to 4 carbon atoms, and ##STR2## wherein: m is a positive integer sufficient to achieve a weight average molecular weight between about 5000 and about 100,000,R.sub.1 and R are independently selected from the group consisting of alkylene units containing from 1 to 10 carbon atoms,between 1 and 99 percent of the R.sub.3 and R.sub.4 sites are --H, and between 25 percent and 99 percent of the remainder of the R.sub.3 and R.sub.4 sites are --CH.sub.2 --O--(CH.sub.2).sub.w --CH.dbd.CH.sub.2,whereinw is 1, 2 or 3, andbetween 1 percent and 75 percent of the R.sub.2 sites are --CH.sub.2 --O--R.sub.5wherein R.sub.5 is an alkyl unit containing 1 to 4 carbon atoms.The allyloxymethylatedpolyamide may be synthesized by reacting an alcohol soluble polyamide with formaldehyde and an allylalcohol.The allyloxymethylatedpolyamide may be cross linked by a process selected from the group consisting of(a) heating an allyloxymethylatedpolyamide in the presence of a free radical catalyst, and(b) hydrosilation of the double bond of the allyloxy group of the allyloxymethylatedpolyamide with a silicon hydride reactant having at least 2 reactive sites.A preferred article includesa substrate,at least one photoconductive layer, andan overcoat layer comprisinga hole transporting hydroxy arylamine compound having at least two hydroxy functional groups, anda cross linked allyloxymethylatedpolyamide film forming binder.A stabilizer may be added to the overcoat.
摘要:
A crosslinkable charge transport layer material for a photoconductor includes at least one poly(arylene ether alcohol), at least one polyisocyanate crosslinking agent and at least one charge transport material dispersed in a solvent. The crosslinkable charge transport layer material is crosslinked following application of the coating solution to the photoconductor. The photoconductor including such crosslinked charge transport layer exhibits excellent wear resistance so as to have long life, thereby reducing the cost of electrophotographic printing machines employing such photoconductors therein.
摘要:
An electrophotographic imaging member including a supporting substrate coated with at least photoconductive layer, a charge transport layer and an overcoating layer, the overcoating layer includinga hydroxy functionalized aromatic diamine anda hydroxy functionalized triarylamine dissolved or molecularly dispersed ina crosslinked polyamide matrix, the crosslinked polyamide prior to crosslinking being selected from the group consisting of materials represented by the following Formulae I and II: ##STR1## wherein: n is a positive integer sufficient to achieve a weight average molecular weight between about 5000 and about 100,000,R is an alkylene unit containing from 1 to 10 carbon atoms,between 1 and 99 percent of the R.sub.2 sites are --H, andthe remainder of the R.sub.2 sites are --CH.sub.2 --O--CH.sub.3, and ##STR2## wherein: m is a positive integer sufficient to achieve a weight average molecular weight between about 5000 and about 100000,R.sub.1 and R are independently selected from the group consisting of alkylene units containing from 1 to 10 carbon atoms, andbetween 1 and 99 percent of the R.sub.3 and R.sub.4 sites are --H, andthe remainder of the R.sub.3 and R.sub.4 sites are --CH.sub.2 --O--CH.sub.3.Coating compositions for the overcoating layer of this invention as well as methods of making and using the overcoated photoreceptor are also disclosed.
摘要:
An electrophotographic imaging member includingat least one photographic imaging layer anda partially electrically conductive overcoat layer includingfinely divided charge injection enabling particles dispersed ina charge transporting continuous matrix including a cross linked polyamide, charge transport molecules and oxidized charge transport molecules, the continuous matrix being formed from a solution selected from the group includinga first solution includingcrosslinkable alcohol soluble polyamide containing methoxy methyl groups attached to amide nitrogen atoms,an acid having a pK.sub.a of less than about 3,a cross linking agent selected from the group comprising a formaldehyde generating cross linking agent, an alkoxylated cross linking agent, a methylolamine cross linking agent and mixtures thereof,a dihydroxy arylamine, anda liquid selected from the group including alcohol solvents, diluent and mixtures thereof,a second solution includingcrosslinkable alcohol soluble polyamide free of methoxy methyl groups attached to amide nitrogen atoms,an acid having a pK.sub.a of less than about 3,an alkoxylated cross linking agent, a methylolamine cross linking agent and mixtures thereof,a dihydroxy arylamine, anda liquid selected from the group including alcohol solvents, diluent and mixtures thereof.The electrophotographic imaging process is also disclosed.
摘要:
A multi-layer optical recording member for use with a recording laser for optical recording and retrieving information thereon, as well as a method of fabricating and using said member is described. The optical recording member comprises in sequential order a structural substrate, a thermally degradable polymer layer, a light absorbing recording layer, a thermally degradable polymer dielectric layer, and a reflective layer. The substrate and the thermally degradable polymer layers are stable under ambient light and temperature conditions and substantially transparent to the recording and reading optical radiation. The combined thicknesses of the light absorbing layer and the dielectric layer are such as to provide anti-reflecting conditionsat the recording wavelength and optical contrast between marked and unmarked areas at the reading wavelength. The optical recording member may be used with a single laser source for both recording and reading. Upon exposure to recording radiation, the portion of the light absorbing layer exposed is heated by the absorbed energy which in turn heats adjacent areas of both thermally degradable polymer layers to a level where at least some polymer decomposition with a consequent evolution of gaseous decomposition products occurs resulting in the formation of a hole in the exposed area of the heat absorbing layer.
摘要:
An electrophotographic imaging member includinga supporting substrate coated withat least one photoconductive layer, andan overcoating layer, the overcoating layer including aa hydroxy functionalized aromatic diamine anda hydroxy functionalized triarylamine dissolved or molecularly dispersed ina crosslinked acrylated polyamide matrix, the hydroxy functionalized triarylamine being a compound different from the polyhydroxy functionalized aromatic diamine, the crosslinked polyamide prior to crosslinking being selected from the group consisting of materials represented by the following Formulae I and II: ##STR1## wherein: n is a positive integer sufficient to achieve a weight average molecular weight between about 5000 and about 100,000,R is an alkylene group containing from 1 to 10 carbon atoms,between 1 and 99 percent of the R.sub.2 sites are ##STR2## wherein X is selected from the group consisting of --H (acrylate), --CH.sub.3 (methacrylate), alkyl and aryl, andthe remainder of the R.sub.2 sites are selected from the group consisting of --H, --CH.sub.2 OCH.sub.3, and --CH.sub.2 OH, and ##STR3## wherein: m is a positive integer sufficient to achieve a weight average molecular weight between about 5000 and about 100000,R and R.sub.1 are independently selected from the group consisting of alkylene units containing from 1 to 10 carbon atoms;between 1 and 99 percent of R.sub.3 and R.sub.4 are independently selected from the group consisting of ##STR4## wherein X is selected from the group consisting of hydrogen, alkyl, aryl and alkylaryl, wherein the alkyl groups contain 1 to 10 carbon atoms and the aryl groups contain 1 to 3 alkyl groups, y is an integer between 1 and 10, andthe remainder of the R.sub.3 and R.sub.4 groups are selected from the group consisting of --H, --CH.sub.2 OH, --CH.sub.2 OCH.sub.3, and --CH.sub.2 OC(O)--C(X).dbd.CH.sub.2.The overcoating layer is formed by coating. The electrophotographic imaging member may be imaged in a process.
摘要:
A process for fabricating an electrophotographic imaging member including providing a substrate coated with at least one photoconductive layer, applying a coating composition to the photoconductive layer by dip coating to form a wet layer, the coating composition comprising finely divided amorphous silica particles, a dihydroxy amine charge transport material, an aryl charge transport material that is different from the dihydroxy amine charge transport material, a crosslinkable polyamide containing methoxy groups attached to amide nitrogen atoms and a crosslinking catalyst, at least one solvent for the hydroxy amine charge transport material, aryl charge transport material that is different from the dihydroxy amine charge transport material and the crosslinkable polyamide, and heating the wet layer to crosslink the polyamide and remove the solvent to form a dry layer in which the dihydroxy amine charge transport material and the aryl charge transport material are molecularly dispersed in a crosslinked polyamide matrix.