Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
  • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
  • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D213/72—Nitrogen atoms
  • C07D213/74—Amino or imino radicals substituted by hydrocarbon or substituted hydrocarbon radicals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D209/56—Ring systems containing three or more rings
  • C07D209/80—[b, c]- or [b, d]-condensed
  • C07D209/82—Carbazoles; Hydrogenated carbazoles
  • C07D209/88—Carbazoles; Hydrogenated carbazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the ring system
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D215/00—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
  • C07D215/02—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
  • C07D215/16—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D215/38—Nitrogen atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
  • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
  • C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D307/38—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms
  • C07D307/52—Radicals substituted by nitrogen atoms not forming part of a nitro radical
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
  • C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
  • C07D333/04—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
  • C07D333/06—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to the ring carbon atoms
  • C07D333/22—Radicals substituted by doubly bound hetero atoms, or by two hetero atoms other than halogen singly bound to the same carbon atom
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
  • G03G5/02—Charge-receiving layers
  • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
  • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
  • G03G5/0601—Acyclic or carbocyclic compounds
  • G03G5/0612—Acyclic or carbocyclic compounds containing nitrogen
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
  • G03G5/02—Charge-receiving layers
  • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
  • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
  • G03G5/0622—Heterocyclic compounds
  • G03G5/0624—Heterocyclic compounds containing one hetero ring
  • G03G5/0627—Heterocyclic compounds containing one hetero ring being five-membered
  • G03G5/0629—Heterocyclic compounds containing one hetero ring being five-membered containing one hetero atom
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
  • G03G5/02—Charge-receiving layers
  • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
  • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
  • G03G5/0622—Heterocyclic compounds
  • G03G5/0624—Heterocyclic compounds containing one hetero ring
  • G03G5/0635—Heterocyclic compounds containing one hetero ring being six-membered
  • G03G5/0637—Heterocyclic compounds containing one hetero ring being six-membered containing one hetero atom
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S101/00—Printing
  • Y10S101/37—Printing employing electrostatic force

Definitions

• This invention relates to photographic reproduction and more particularly to electro-photographic processes, namely processes in which an electrostatic latent image is produced by utilizing the property of photoconductivity (i.e., a variable conductivity dependent on the intensity of illumination).
• the electrostatic latent image may be produced in a conventional exposure operation, for example by means of a lens-projected image or by contact-printing techniques, whereby a non-visible electrostatic charge pattern (the so-called electrostatic latent image) is created on a surface, in which pattern the charge density at any point is related to the'intensity of illumination obtaining at that point during the exposure.
• the latent image may be developedi.e., rendered visible -by means of an electroscopic powder, such as a colored synthetic resin powder, and the resulting visible image may be fixed by rendering the powder permanently adherent to a support on which the image. is desired, for example, in suitable cases by heating to soften or melt the powder particles and/ or the surface of the image support, or with volatile solvents.
• the electrostatic latent image is commonly formed onthe surface of a photo conductive insulating layer carried on a support.
• material comprising such support and photo-conductive layer may be sensitized by applying a uniform surface charge to the free surface of the photoconductive layer.
• Such surface charge may be applied, for example,
• Electro-photographic processes have become of increasing importance in recent years, especially, for example, in connection with ofiice duplicating where, offering as they do a wholly dry copying process, they have considerable attractiveness.
• Much interest has been aroused and investigation made, particularly in regard to suitable materials for use as a support and as a photoconductive insulating layer adapted to such processes.
• a great many attempts have been made to provide such materials which fulfill modern requirements in respect to range of use, reliability, simplicity in handling, potential light sensitivity and keeping qualities.
• the photoconductive substances are of the general formulae in which R, and R each represents a univalent carbo nated R may comprise a naphthyl group, or a phenyl group having a nitro group as an orthoor para-substituent therein.
• the groups designated R may comprise a naphthyl group or a phenyl group having a methoxy group as an orthoor para-substituent therein.
• the compounds covered by the above general formulae can be prepared in manner known per se.
• Those compounds corresponding to the general Formula I may usually be obtained by condensation of equimolecular parts of an aromatic or heterocyclic aldehyde and a primary aro matic or heterocyclic amine, the reaction components being heated in alcoholic solution with or without added alkaline condensation agents, such as piperidine, sodium carbonate solution, sodium or potassium hydroxide.
• alkaline condensation agents such as piperidine, sodium carbonate solution, sodium or potassium hydroxide.
• Those compounds which correspond to the general F ormula II are ordinarily best prepared by condensation of equimolecular parts of a compound with an active methylene group adjacent to a cyano group, (e.g. benzyl cyanamide, w-cyano-acetophenone, malonic acid dinitrile or cyano-acetic acid alkyl ester), and an amino nitroso compound of the benzene series, e.g., p-nitroso-alkyl-aniline, or p-nitroso-dialkyl-aniline, the reaction components being heated in alcoholic solution in the presence of alkaline condensation agents.
• the compounds corresponding to Formula II are also for the most part described in the literature. For those examples mentioned herein that are not so described the method of preparation is given here below.
• (4-nitro-benzylidene) 4 methoxy aniline otherwise known as (4-nitro-benzylidene)-p-anisidine, correspond ing to Formula 6, melting point 139 C.
• (4' amino benzylidene)-4-methoxy-aniline otherwise known as (4-amino-benzylidene)-p-anisidine, corresponding to Formula 7, (melting point C.), which may be prepared by catalytic reduction of the compound cor responding to Formula 6 in dioxane with Raney nickel.
• (4'-phenyl-benzylidene) -4-methoxy-aniline otherwise known as (4-phenyl-benzylidene)-p-anisidine, correspondingto Formula 12, (melting point 182 C.) may be prepared by condensing l.8 g. of 4-diphenylaldehyde with 1.2 g. of p-anisidine in 15 ml. of ethyl alcohol, the reaction being brought about by brief heating. The reaction mixture is allowed to cool and the precipitate which has by then fallen out, is separated from the mother liquor and recrystallized from ethyl alcohol.
• (4-phenyl-benzylidene)-m-chloroaniline corresponding to Formula 13, (melting point C.), may be prepared by condensing 1.8 g. of 4-diphenylaldehyde with 1.3 g. of m-chloroaniline in 20 ml. of ethyl alcohol. The reaction mixture is heated for 30 minutes on the steam bath and the reaction product that precipitates out as the reaction mixture cools and is recrystallized from ethyl alcohol.
• 1-furfurylideneamino-2-rnethyl-5-nitro-benzene otherwise known as (furfurylidene)-(2-methyl 5-nitro) -aniline, corresponding to Formula 16 (melting point 151 C.), which may be prepared by condensing 4.8 g. of furfural with 7.6 g. of 4-nitro-o-toluidine in 25 ml. of absolute ethyl alcohol, the reaction mixture being heated for a short time on the steam bath.
• Anthracylidene-aniline corresponding to Formula 23 (melting point 124-125 C.), which may beprepared by briefly heating an ethyl alcohol solution containing 20.6 g. of 9-anthracene-aldehyde and 9.3 g. of aniline. The condensation product precipitates out after the reaction mixture has cooled, is separated by filtration from the mother liquor and purified by recrystallization from 96% ethyl alcohol.
• 5- anthracylidene-amino) -acenaphthene corresponding to Formula 24 (melting point 158-160 C.), which may be prepared by boiling an ethyl alcohol solution containing 20.6 g. of 9-anthracenealdehyde and 16.9 g. of 5- aminoacenaphthene, for one hour.
• Thienylidene-B-naphthylamine corresponding to Formula 25 (melting point 103'104 C.), which can be prepared by briefiy heating an ethyl alcohol solution containing 11.2 g. of 2-thiophenaldehyde and 14.3 g. of fi-naphthylamine.
• the condensation product precipitates out in crystalline form after the reaction mixture has cooled.
• the reaction product is purified by recrystallization from 96% ethyl alcohol.
• Thienylidene-a-naphthylamine corresponding to Formula 26, (melting point 76 C.), which can be obtained by boiling an ethyl alcohol solution containing 11.2 g. of 2-thiophenaldehyde and 14.3 g. of a-naphthylamine. After the reaction mixture has cooled, the condensation product precipitates out, and can be recrystallized from 96% ethyl alcohol.
• Thienylidene-amino-acenaphthene corresponding to Formula 27, melting point 104 C., which can be obtained by boiling an ethyl alcohol solution containing 11.2 g. of Z-thiophenaldehyde and 16.9 g. of S-aminoacenaph thene.
• N,N dimethyl N-- (2,4 dihydroxy benzylidene)- p-phenylene diamine corresponding to Formula 29 (melting point 214-215 C.), which may be prepared by con- (lensing 13.6 g. of p-N,N-dimethylamino-aniline with 13.8 g. of 2,4-dihydroxybenzaldehyde in ethyl alcohol solution. The reaction takes place at room temperature. The precipitated reaction product is recrystallized from ethyl alcohol.
• N,N dimethyl N (benzoyl-cyano-methylene)-pphenylenediamine corresponding to Formula 32 (melting point 129130 C.), which can be prepared by condensing 1.3 g. of w-cyanoacetophenone with 1.3 g. of pnitroso-N-dimethylaniline in 15 ml. of ethyl alcohol, to which 2 drops of 33% sodium hydroxide solution have been added, the reaction being brought about by brief heating on a steam bath.
• N,N dimethyl N (dicyanomethylene) -p-phenylene diamine corresponding to Formula 33; melting point 165 C.
• the compounds to be used as provided by the invention have very good photoconductivity and are particularly suitable for the preparation of homogeneous layers which have a long shelf-life. Most of the compounds are of yellow color.
• the photoconductive substances which are used according to the invention for the preparation of the photoconductive insulating layers are preferably so used in solution in organic solvents, such as, for example, benzene, acetone, methylene chloride or glycol-monomethyl-ether. Mixtures of two or more photoconductive substances may also be used in such solution as may mixtures of solvents. It is also possible to employ the photoconductive substances in association with other organic photoconductive substances.
• organic solvents such as, for example, benzene, acetone, methylene chloride or glycol-monomethyl-ether.
• Mixtures of two or more photoconductive substances may also be used in such solution as may mixtures of solvents. It is also possible to employ the photoconductive substances in association with other organic photoconductive substances.
• Natural and synthetic resins e.g., balsam resins, phenol ins, which includes processed natural substances such as cellulose ether, see the Kunststoffstofitaschenbuch (Plastics Pocket Book) published by Saechtling-Zebrowski (11th edition, 1955) from page 212;
• Polymers such as the polyvinyl chlorides, polyvinyl acetate, polyvinyl acetals, polyvinyl alcohols, polyvinyl ethers, polyacrylic and polymethacrylic esters, and polystyrene and isobutylene polymers;
• Polycondensates e.g., polyesters, such as phthalate resins, alkyd resins, maleic acid resins, colophony esters of mixed higher alcohols, phenol-formaldehyde resins, particularly colophony-modified phenol-formaldehyde condensates, urea-formaldehyde resins, melamine-formaldehyde condensates, aldehyde resins, ketone resins of which particular mention is to be made of AW 2 resins of the form Badische Anilinund Sodafabrik, xylene-formaldehyde resins'and polyamides;
• polyesters such as phthalate resins, alkyd resins, maleic acid resins, colophony esters of mixed higher alcohols, phenol-formaldehyde resins, particularly colophony-modified phenol-formaldehyde condensates, urea-formaldehyde resins, mel
• Polyadducts such as polyurethanes.
• the support may be of any material suitable for use in electrophotographic processes as, for example, aluminum or other metal plates or foils; glass plates; paper sheets or webs, or plastic foils, especially foils made of electrically conductive resins.
• paper If paper is to be used as support for the photoconductive layer, it is preferable that it shall have been pretreated against penetration by the coating solution, for example, with methyl cel-' lulose in aqueous solution; polyvinyl alcohol in aqueous solution; a solution in acetone and methyl-ethyl-ketone of a mixed polymer of acrylic acid methyl ester and acrylonitrile; or with solutions of polyamides in aqueous alcohols.
• Aqueous dispersions of other substances suitable for the pretreatment of the paper surface may also be used.
• Solutions of the photoconductive substances in organic solvents as described above, with or Without the added organic colloids aforementioned, can be applied to the supports in known manner (for example, by spraying, direct application, or whirl coating), and the supports thus coated, dried, so that an even photoconductive layer is formed thereon.
• the layers are, in themselves, non-light-sensitive, by applying a positive or negative electrostatic charge thereto, by means, for example, of a corona discharge, the layers are rendered light-sensitive and can be used With long-wave U.V. light of 3,600 to 4,000 A.U. in producing electrostatic latent images as described above. Very good images may be obtained by a short exposure under a master to a high-pressure lamp.
• the layers when charged are but slightly sensitive to light in the visible spectrum, it has further been found that their spectral sensitivity can be extended into the visible part of the spectrum by the addition to the layers of sensitizers, preferably in the proportion one to three percent weight for weight of photoconductive substance.
• the most suitable sensitizers are dyestutf coml0 pounds, a number of which are given by way of example in the following table:
• Dyestufi Group Dyestufi Compound Brilliant Green N0. 760 (p.314). Victoria Blue 13.. N o. 822 p 3-17) Trlarylmethane dyes Methyl Violet No. 783 p. 327). Crystal Violet N o. 785 (p. 329). Acid Violet 6B N0. 831 (p. 351). Xanthene dyes:
• Rhodamlne B No. 864 (p. 365). Rhodamine 6G No. 866 (p. 366). Rhodamines Rhodamine G extra.-- No. 865 (p. 366). Sulphorhodamine B... No. 863 (p. 364). True acid Eosin G...- No. 870 (p. 368). Eosin S... No. 883 (p. 375). tha 13" lit 2* 23%) r ros o. p Phthalems Phloxin--- No. 2490 (p.378). Rose Bengal- N o. 889 (p. 378).
• Fluorescein N0. 880 (p 373 Thiazine dyes 906 (p. 386): 924 (p. 396). 927 (p. 397).
• the layer-carrying supports may be utilized for the production of images by electrophotographic means, for.
• the photoconductive layer When the photoconductive layer has been charged, by means of, for example, a corona discharge with a charging apparatus maintained at 6000 volts, the thus sensitized layer is exposed to light under a master or by episcopic or diascopic projection and is then dusted overin known manner with a suitable developing agent such as a resin powder colored with carbon black.
• a suitable developing agent such as a resin powder colored with carbon black.
• the resin developer is preferably obtained by fusing 30 parts by weight of polystyrene (K-Wert 55) 30 parts by weight of a maleic acid resin modified with rosin and sold under the registered trademark Beckacite K105, and 3 parts by weight of carbon black, and subsequently finely grinding the fused mass.
• the image that now becomes visible can easily be wiped off, and therefore needs to be fixed; it can, for example, be heated briefly to'approximately C. by means of an infra-red radiator.
• the temperature need not be as high as this if the heat treatment is carried out in the presence of vapors of solvents such as trichloroethylene, carbon tetrachloride or ethyl alcohol.
• the powdered image can also be fixed by means of steam. From positive masters, positive images of good contrast are produced.
• the support e.g., the paper or plastic foil
• a solvent for the photoconductive layer e.g., ethyl alcohol, or acetic acid
• positive printing plates are obtained which can be set up in an offset machine and used for printing. They give very long runs.
• the electro-phitographic images can also be used as masters for the production of further copies on any sort of light-sensitive sheets.
• the photoconductive compounds to be used, as provided by the invention are superior to substances used hitherto, such as selenium or zinc oxide, inasmuch as the latter give cloudy layers because solid solutions cannot be produced with such materials and only suspensions are possible.
• reflex images can also be produced.
• the possibility of a reflex .copy is also an advantage over the known art.
• the photoconductive layers. prepared as provided in the invention have a further important advantage in that they can be charged positively as well as negatively.
• Example 1 1 g. of the compound corresponding to Formula 28 and 1.5 g. of rosin-modified maleic acid resin, (e.g., the resin marketed by Reichhold-Chemie AG, Hamburg under the registered trademark Beckacite K 105), are dissolved in 50 cc. of a 1:1 benzeneacetone mixture. Approximately 15 cc. of this solution are distributed evenly over a paper foil (format DIN A 4). After evaporation of the solvent mixture a coating is left that adheres firmly to the surface of the paper foil. After the coating has been electrically charged and then exposed under a master by thecontact processor by diascopic or episcopic projection, an image of the master is obtained by dusting over with the resin powder colored with carbon black and subsequent heating in known manner.
• rosin-modified maleic acid resin e.g., the resin marketed by Reichhold-Chemie AG, Hamburg under the registered trademark Beckacite K 105
• Example 2 1 g. of the compound corresponding to Formula 6 and 2 g. of rosin-modified maleic acid resin, (e.g., the resin employed in Example 1), are dissolved in a mixture of 25 cc. of acetone and 25 cc. of benzene. Two 10-00. portions of this solution are applied one after the other to a foil of transparent paper (75 g.s.m.) format DIN A 4 to form a coating. After evaporation of the solvent the dry coating, which is of yellow'color, adheres firmly to the surface of the transparent paper. In the electro-photographic process images are produced on this coating which are characterized by excellent contrast on a yellow background and can be used as masters for reproduction purposes.
• Example 3 1 g. of the compound corresponding to Formula 28 and 2 g. of rosin-modified maleic acid resin, (e.g., the product marketed by Reichhold-Chernie AG, Hamburg, under the registered trademark Beckacite K 125), are dissolved in 50 cc. of a benzene/ acetone mixture in proportion of 1:1. Three l-cc. portions of this solution are applied one after the other to 2? foil of transparent paper (80 g.s.m.) of format DIN A 4 to form a coating. After evaporation of the solvent the coating is dried under an infra-red radiator; it adheres firmly to the surface of the paper foil. By electro-photographic means, images can be produced on this coating which are of good contrast with a practically colorless background and are suitable for use as masters for reproduction purposes.
• rosin-modified maleic acid resin e.g., the product marketed by Reichhold-Chernie AG, Hamburg, under the registered trademark Beckacite K 125
• Example 4 1 g. of the compound corresponding to Formula 4 and 1 g. of unsaponified ketone-aldehydecondensation-resin, e.g., the product marketed by Chemische Werke Hills AG, Marl (Krs. Reckling-hausen under the trade name Kunststoffharz AP), are dissolved in 30 g. of glycol monomethyl ether. The solution is applied to paper and dried. Images can be produced on this paper electrophotographically by charging the coating by means of a corona discharge and then exposing the paper beneath a positive master, followed by dusting over with the resin powder colored with carbon black in known manner. Positive images are produced that can be fixed by heat treatment with steam.
• unsaponified ketone-aldehydecondensation-resin e.g., the product marketed by Chemische Werke Hills AG, Marl (Krs. Reckling-hausen under the trade name Kunststoffharz AP)
• Example 5 1 g; of the compound corresponding to Formula 1, l g. of ketone resin (e.g., the ketone resin produced by the Chemische Werke Hiils AG, Marl (Kr. Recklinghausen) and marketed under the trade nameKunstharz SK), and
• ketone resin e.g., the ketone resin produced by the Chemische Werke Hiils AG, Marl (Kr. Recklinghausen) and marketed under the trade nameKunstharz SK
• Example 7 1 g. of the compound corresponding to Formula 30 and 1.5 g. of cournarone resin (e.g., the resin known as Cumaronharz 701/70 marketed by the Deutschen fiir Teerverêt, Duisburg-Meiderich), are dissolved in a mixture of 25 cc. of benzene and 25 cc. of acetone. This solution is applied to an aluminum foil of which the surface has been previously cleaned of grease. After the solvent has evaporated and the coating has been dried the latter adheres firmly to the surface.
• cournarone resin e.g., the resin known as Cumaronharz 701/70 marketed by the Deutschen fiir Teerverêt, Duisburg-Meiderich
• Example 8 1 g. of the compound corresponding to Formula 33 and 1 g. of zinc-modified resin (e.g. the product marketed by R. Kramer, Bremen, under the trade name Erkazit Zinkharz are dissolved in 30 cc. of benzene. The solution is applied to a paper foil prepared in accordance with American Patents 2,534,650, 2,681,617, or 2,559,- 610, or to an aluminum foil of which the surface has been cleaned of grease. After evaporation of the solvent, the coating adheres firmly to the surface of the aluminum foil.
• zinc-modified resin e.g. the product marketed by R. Kramer, Bremen, under the trade name Erkazit Zinkharz are dissolved in 30 cc. of benzene.
• the solution is applied to a paper foil prepared in accordance with American Patents 2,534,650, 2,681,617, or 2,559,- 610, or to an aluminum foil of which the surface has been cleaned of grease. After evaporation
• Example 9 The procedure as in Example 1 is followed except that the coating solution used consists of 1 g. of the compound corresponding to Formula 4 and 1 g. of the compound corresponding to Formula 2 in 30 g. of glycol monomethyl ether. Positive images are obtained.
• Example 10 13 coated paper foil is subjected to the further procedure as described in Example 1. From a positive master a positive image with very rich contrast is obtained.
• Example 11 1 g. of the compound corresponding to Formula 33 and 1 g. of 2,5-bis-[4'-diethyl-aminophenyl-(1)]-l,3,4- triazole are dissolved in 30 g. of glycol monomethyl ether and the solution is applied 'to an aluminum foil. After evaporation of the solvent, the coating adheres firmly to the aluminum surface. With the coated aluminum foil so prepared, electrophotographic images can be produced as described in Example 1. If a sheet of paper is placed on the unfixed image in the carbon blackresin powder and recharging by means of a corona discharge is carried out, the said image in carbon blackresin powder is transferred from the aluminum foil to the paper to produce a mirror-image. If the cabon blackresin image is transferred to transparent paper or to a transparent plastic foil, the image obtained can be further copied, for example, on diazo photoprinting paper.
• a photographic reproduction process which comprises exposing an electrostatically charged, supported photoconductive insulating layer to light under a master to discharge the layer at the exposed portions and developing the resulting image with an electroscopic material, the photoconductive layer comprising a compound having the formula in which R'is selected from the group consisting of an aryl group and heterocyclic, aroyl, cyano, and carbalkoxy radicals, R is selected from the group consisting of hydrogen and cyano radicals, and R is selected from the group consisting of an aryl group and heterocyclic radicals.
• a photographic reproduction process which comprises exposing an electrostatically charged, supported photoconductive insulating layer to light under a master to discharge the layer at the exposed portions and developing the resulting image with an electroscopic material, the photoconductive layer comprising a compound having the formula in which R and R are aryl groups.
• a photographic reproduction process which comprises exposing an electrostatically charged, supported photoconductive insulating layer to light under a master to discharge the layer at the exposed portions and developing the resulting image with an electroscopic -material, the photoconductive layer comprising a compound having the formula 14 in which R is a heterocyclic radical and R isfan aryl group.
• a photographic reproduction process which comprises exposing an electrostatically charged, supported photoconductive insulating layer to light under a master to discharge the layer at the exposed portions and developing the resulting image with an electroscopic material, the photoconductive layer comprising a compound having the formula :E I n 12.
• a photographic reproduction process which comprises exposing an electrostatically charged, supported photoconductive insulating layer to light under a master to discharge the layer at the exposed portions and developing the resulting image with an electroscopic material, the photoconductive layer comprising a, compound having the formula 15.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Photoreceptors In Electrophotography (AREA)
• Nitrogen Condensed Heterocyclic Rings (AREA)

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Cited By (25)

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Citations (7)

• 0
  • NL NL218635D patent/NL218635A/xx unknown
  • NL NL100994D patent/NL100994C/xx active
• 1957
  • 1957-06-29 FR FR1178601D patent/FR1178601A/fr not_active Expired
  • 1957-07-02 US US669469A patent/US3041165A/en not_active Expired - Lifetime
  • 1957-07-03 GB GB20969/57A patent/GB836151A/en not_active Expired

Patent Citations (7)

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