DE1082281B - Process for the production of prints according to the alcohol transfer printing process with the aid of the electrophotographic process using photoconductive layers - Google Patents

Process for the production of prints according to the alcohol transfer printing process with the aid of the electrophotographic process using photoconductive layers

Info

Publication number
DE1082281B
DE1082281B DEA26009A DEA0026009A DE1082281B DE 1082281 B DE1082281 B DE 1082281B DE A26009 A DEA26009 A DE A26009A DE A0026009 A DEA0026009 A DE A0026009A DE 1082281 B DE1082281 B DE 1082281B
Authority
DE
Germany
Prior art keywords
alcohol
transfer printing
production
photoconductive layers
aid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DEA26009A
Other languages
German (de)
Inventor
Dr Gustav Schaum
Dr Heinrich Seibert
Dr Hildegard Haydn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert NV
Original Assignee
Agfa AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE562337D priority Critical patent/BE562337A/xx
Priority to BE562338D priority patent/BE562338A/xx
Application filed by Agfa AG filed Critical Agfa AG
Priority to DEA26009A priority patent/DE1082281B/en
Priority to GB35255/57A priority patent/GB883784A/en
Priority to CH5256657A priority patent/CH369020A/en
Priority to GB35254/57A priority patent/GB883783A/en
Priority to US696024A priority patent/US3128204A/en
Priority to FR1190060D priority patent/FR1190060A/en
Publication of DE1082281B publication Critical patent/DE1082281B/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
    • G03G5/0503—Inert supplements
    • G03G5/0507—Inorganic compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/26—Electrographic processes using a charge pattern for the production of printing plates for non-xerographic printing processes
    • G03G13/30—Hectographic masters
    • 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
    • G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
    • G03G5/0503—Inert supplements
    • G03G5/051—Organic non-macromolecular compounds
    • G03G5/0514—Organic non-macromolecular compounds not comprising cyclic groups
    • 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
    • G03G5/0662—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic containing metal elements
    • 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
    • G03G5/08—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being inorganic
    • G03G5/087—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being inorganic and being incorporated in an organic bonding material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/09—Colouring agents for toner particles
    • G03G9/0906—Organic dyes
    • G03G9/0912—Indigoid; Diaryl and Triaryl methane; Oxyketone dyes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/09—Colouring agents for toner particles
    • G03G9/0926—Colouring agents for toner particles characterised by physical or chemical properties

Description

PEUTSCHESPEUTSCHES

Beim Spiritus-Umdruckverfahren wird bekanntlich eine Druckmatrize verwendet, deren druckende Stellen einen genügenden Vorrat an alkohollöslichem Farbstoff besitzen. In entsprechenden Druckmaschinen wird ein Teil dieses Farbstoffes durch Befeuchten mit Alkohol, insbesondere auf einen damit befeuchteten Träger, wie Papier u. dgl,, übertragen.In the alcohol transfer printing process, as is well known, a printing matrix is used, the printing areas of which have a sufficient supply of alcohol-soluble dye. In corresponding printing machines becomes part of this dye by moistening with alcohol, especially on one moistened with it Carriers such as paper and the like are transferred.

Bisher hat man die druckenden Stellen der Matrizen mit Hilfe von Kopierpapieren, die sehr viel eines alkohollöslichen Farbstoffes in einer Wachsschicht eingebettet enthalten, erzeugt.So far one has the printing areas of the matrices with the help of copy paper, which is very much one contains alcohol-soluble dye embedded in a layer of wax.

Weiterhin ist aus der USA-Patentschrift 2 297 691 ein Verfahren zur Herstellung von Druckformen für den Spiritusdruck auf elektrophotographischem Wege bekanntgeworden, wonach die Ladungsbilder mit einem einen basischen alkohollöslichen Farbstoff enthaltenden Entwicklungspulver entwickelt werden. Diese Pulver weisen jedoch den Nachteil auf, daß sie im Spiritus-Umdruckverfahren nicht genügend ergiebig sind.Furthermore, US Pat. No. 2,297,691 a process for the production of printing forms for the spirit pressure became known by electrophotographic means, after which the charge images with a developing powder containing a basic alcohol-soluble dye. However, these powders have the disadvantage that they are not sufficiently productive in the spirit transfer printing process are.

In der USA. - Patentschrift 2 691595 werden schwarze hektographische Druckfarben für Vervielfältigungszwecke beschrieben, die durch mechanisches Mischen von zwei trockenen Farbstoffen erhalten werden, die dann in Wachs dispergiert und in dieser Form auf eine beliebige Unterlage aufgebracht werden. Derartige Druckpasten sind nicht als Toner für elektrophotographische Schichten geeignet.In the USA. - Patent 2 691595 black hectographic inks described for reproduction purposes by mechanical Mixing two dry dyes can be obtained, which are then dispersed in wax and in this form can be applied to any surface. Such printing pastes are not suitable as toners for electrophotographic Layers suitable.

Es wurde nun gefunden, daß sich Druckformen für den Spiritusdruck unter Verwendung von photoleitfähigen Schichten herstellen lassen, wenn man für das Entwicklungspulver Fällungen von alkohollöslichen basischen Farbstoffen durch saure oder substantive Farbstoffe, gegebenenfalls auf geeigneten Substraten, verwendet.It has now been found that printing forms for alcohol printing using photoconductive Layers can be produced if alcohol-soluble precipitations are used for the developing powder basic dyes by acidic or substantive dyes, if necessary on suitable substrates, used.

Man erhält so ein noch spritlösliches Pigment, das ohne Träger mit Harz vermischt als Toner verarbeitet werden kann. So hergestellte Entwicklungspulver zeigen eine wesentlich höhere Ausgiebigkeit der Schrift im Spiritus-Umdruckverfahren als die bisher bekannten Farbstoffentwicklungspulver. Ferner werden mit diesen Entwicklungspulvern besonders haltbare Bilder erzeugt.The result is a still fuel-soluble pigment that is mixed with resin without a carrier and processed as a toner can be. Developing powders produced in this way show a significantly higher yield of the Font in the alcohol transfer printing process as the previously known dye developing powder. Further be Produced particularly durable images with these developing powders.

Zur Herstellung der Druckmatrizen können die bekannten photoleitfähigen Schichten oder die Schichten gemäß den deutschen Auslegeschriften 1040 900, 1 060 259 und 1 046 493 verwendet werden. Zu diesem Zweck lädt man die photoleitfähigen Schichten mit etwa 7000 Volt auf und belichtet durch eine Vorlage oder optisch. Die Entwicklung erfolgt nun nicht mit den üblichen Tonern, die beispielsweise Ruß enthalten, sondern mit Entwicklungspulvern, die neben Ruß oder einem anderen Träger druckfähige, alkohollösliche Fällungen von basischen Farbstoffen durch saure oder Verfahren zur Herstellung von Druckabzügen nach, dem Spiritus-Umdruckverfahren mit Hilfe des elektrophotographischen Verfahrens unter Verwendung von photoleitfähigen SchichtenThe known photoconductive layers or the layers can be used to produce the printing matrices according to the German Auslegeschriften 1040 900, 1 060 259 and 1 046 493 can be used. To this The purpose is to charge the photoconductive layers with about 7000 volts and expose them through a template or optically. The development does not take place with the usual toners, which contain, for example, carbon black, but with developing powders that are printable, alcohol-soluble in addition to carbon black or another carrier Precipitations of basic dyes by acidic or manufacturing processes of prints according to the spirit transfer printing process by the electrophotographic method using photoconductive layers

Anmelder:Applicant:

Agfa Aktiengesellschaft,Agfa Aktiengesellschaft,

Leverkusen-Bayerwerk,Leverkusen-Bayerwerk,

Kaiser-Wilhelm-AlleeKaiser-Wilhelm-Allee

Dr. Gustav Schaum, Dr. Heinrich Seibert und Dr. Hildegard Haydn, Leverkusen, sind als Erfinder genannt wordenDr. Gustav Schaum, Dr. Heinrich Seibert and Dr. Hildegard Haydn, Leverkusen, have been named as inventors

Substantive Farbstoffe enthalten. Auf der photoleitfähigen Schicht erhält man hiernach ein Bild, das nach Einbrennen des Toners als Matrize dienen kann. Man kann aber auch das Farbstoffpulver vor dem Einbrennen auf eine andere Unterlage übertragen, indem man die beiden Schichten in engen Kontakt bringt und mit einer Ladung von 5000 bis 6000 Volt besprüht. Nach Trennung der beiden Schichten kann das Bild auf dem zweiten Träger eingebrannt und als Matrize für eine Reihe von Abzügen verwendet werden.Nouns contain dyes. An image is then obtained on the photoconductive layer can serve as a template after the toner has been burned in. But you can also use the dye powder before baking transferred to another support by bringing the two layers into close contact and sprayed with a charge of 5000 to 6000 volts. After separating the two layers, the picture can baked onto the second carrier and used as a template for a series of prints.

Ausschlaggebend für die Güte und Anzahl der Spiritusabzüge sind die Eigenschaften des Entwicklungspulvers. Man kann zwei Wege beschreiten: Entweder verwendet man das eingangs erwähnte Verfahren, in dem alkohollösliche Farbstoffe auf geeignete Substrate aufgebracht werden, oder man stellt Fällungen von spritlöslichen basischen mit sauren oder Substantiven Farbstoffen her und erhält so ein noch spritlösliches Pigment, das ohne Träger mit Harz vermischt als Toner verarbeitet werden kann. Nach letzterem Verfahren hergestellte Entwicklungspulver zeigen eine wesentlich höhere Ausgiebigkeit der Schrift im Spiritus-Umdruckverfahren. The properties of the developing powder are decisive for the quality and the number of spirit prints. There are two ways to go: Either the method mentioned at the outset is used, in which alcohol-soluble dyes are applied to suitable substrates be applied, or one makes precipitations of fuel-soluble basic with acidic or nouns Dyes and thus receives a still fuel-soluble pigment that is mixed with resin without a carrier Toner can be processed. Developing powders made by the latter method show one Significantly higher coverage of the font in the spirit transfer printing process.

Als kopierfähige alkohollösliche Farbstoffe können verwendet werden: Kristallviolett, Astrablau, Chrysoidin, Rhodamin oder aber Fällungen von basischen mit sauren oder Substantiven Farbstoffen.The following alcohol-soluble dyes that can be copied can be used: crystal violet, astrab blue, chrysoidine, Rhodamine or precipitations of basic with acidic or noun dyes.

Wichtig ist ferner Art und Menge des Harzes, mit dem diese Farbstoffe vermischt werden. Es ist einerseits erforderlich, daß sich der Farbstoff aus dem ein-The type and amount of resin with which these dyes are mixed is also important. It is on the one hand required that the dye from the one

033 52T/69033 52T / 69

gebrannten Gemisch genügend rasch und gut herauslöst, andererseits darf es aber auch nicht zu einem Verschmieren der Schicht kommen. Am besten eignen sich spritlösliche Harze mit einem Schmelzpunkt zwischen 60 und 120° C, beispielsweiseEster der hydrierten Abietinsäure mit Glycerin oder Pentaerythrit.burnt mixture dissolves sufficiently quickly and well, but on the other hand it must not become one Smear the layer come. Fuel-soluble resins with a melting point between 60 and 120 ° C, for example ester of hydrogenated abietic acid with glycerol or pentaerythritol.

Neben den Farbstoffen und Tonern können die Entwicklungspulver noch andere bekannte Zusätze enthalten. In addition to the dyes and toners, the developing powders can also contain other known additives.

Beispiel 1example 1

100 g Astraphloxin G, hochkonzentriert (Schultz-Nr. 930), werden in 21 Wasser gelöst und eine Lösung von 100 g Benzolichtgelb G, extra konzentriert (Schultz-Nr. 726), gelöst in 201 Wasser von 60° C, unter gutem Rühren zulaufen gelassen. Der ausgefallene Farbstoff wird abfiltriert und mit lauwarmem Wasser gut ausgewaschen und getrocknet. 50 Teile dieses gut gemahlenen Farbstoffes werden mit 50 Teilen eines Mischesters aus Montansäure + Hexantriol + Phthalsäureanhydrid, der in Alkohol gelöst ist, gemischt und auf der Trichtermühle gut angerieben. Der Alkohol wird verdampft und die Farbstoff-Harz-Mischung getrocknet und gut vermählen. Es wird ein orangefarbenes Entwicklungspulver erhalten.100 g of astraphloxin G, highly concentrated (Schultz No. 930), are dissolved in 21 water and a solution of 100 g Benzene Lichtgelb G, extra concentrated (Schultz No. 726), dissolved in 201 water at 60 ° C, allowed to run in with thorough stirring. The precipitated dye is filtered off and washed with lukewarm Water washed out well and dried. 50 parts of this well-ground dye are mixed with 50 parts of a mixed ester of montanic acid + hexanetriol + phthalic anhydride, which is dissolved in alcohol and rubbed well on the funnel grinder. The alcohol is evaporated and the dye-resin mixture dried and ground well. An orange developing powder is obtained.

Beispiel 2Example 2

100 g eines basischen Phthalocyaninfarbstoffes, gelöst in 5 1 Wasser, werden mit einer Lösung von 62 g100 g of a basic phthalocyanine dye, dissolved in 5 l of water, are mixed with a solution of 62 g

Benzolichtgelb G, extra konzentriert (Schultz-Nr. 726), in 15 1 Wasser von 60° C, wie im Beispiel 1 beschrieben, gefällt und verarbeitet. Es wird ein grünes Entwicklungspulver erhalten.Benzene light yellow G, extra concentrated (Schultz No. 726), in 15 1 water at 60 ° C, as described in Example 1, like and processed. A green developing powder is obtained.

Beispiel 3Example 3

Einen schwarzen Fällungsfarbstoff erhält man mit folgender Kombination:A black precipitation dye can be obtained with the following combination:

30 Teile Auramin, konzentriert (Schultz-Nr. 755), 35 Teile Kristallviolett (Schultz-Nr. 785),30 parts auramine, concentrated (Schultz No. 755), 35 parts crystal violet (Schultz No. 785),

20 Teile Methylviolett (Schultz-Nr. 783),20 parts of methyl violet (Schultz No. 783),

15 Teile Astramalachitgrün (Schultz-Nr. 754),15 parts astramalachite green (Schultz No. 754),

26 Teile Acilanfuchsin 6 B (Schultz-Nr. 105),26 parts of Acilanfuchsin 6 B (Schultz No. 105),

65 Teile Lichtgrün SF, gelblich (Schultz-Nr. 765).65 parts light green SF, yellowish (Schultz no. 765).

Die Farbstoffe werden wie im Beispiel 1 gefällt und weiterverarbeitet.The dyes are precipitated as in Example 1 and processed further.

Claims (1)

Patentanspruch:Claim: Verfahren zur Herstellung von Druckformen für den Spiritusdruck unter Verwendung von photoleitfähigen Schichten, in denen nach dem elektrophotographischen Verfahren elektrostatische Ladungsbilder erzeugt werden, dadurch gekennzeichnet, daß für das Entwicklungspulver Fällungen von alkohollöslichen basischen Farbstoffen durch saure oder substantive Farbstoffe, gegebenenfalls auf geeigneten Substraten, verwendet werden.Process for the production of printing forms for alcohol printing using photoconductive layers in which, after the electrophotographic process, electrostatic Charge images are generated, characterized in that precipitations for the developing powder from alcohol-soluble basic dyes through acidic or substantive dyes, if necessary on suitable substrates. ©0M-527K9 5.60© 0M-527K9 5.60
DEA26009A 1956-11-14 1956-11-14 Process for the production of prints according to the alcohol transfer printing process with the aid of the electrophotographic process using photoconductive layers Pending DE1082281B (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
BE562337D BE562337A (en) 1956-11-14
BE562338D BE562338A (en) 1956-11-14
DEA26009A DE1082281B (en) 1956-11-14 1956-11-14 Process for the production of prints according to the alcohol transfer printing process with the aid of the electrophotographic process using photoconductive layers
GB35255/57A GB883784A (en) 1956-11-14 1957-11-12 A process for the production of printing matrices for the spirit transfer printing process with the aid of the electrophotographic process using photo-conductive layers
CH5256657A CH369020A (en) 1956-11-14 1957-11-12 Process for the production of printing forms for alcohol printing
GB35254/57A GB883783A (en) 1956-11-14 1957-11-12 A composite sheet material for electrophotography
US696024A US3128204A (en) 1956-11-14 1957-11-13 Process of preparing photoconductive layers for electrophotography
FR1190060D FR1190060A (en) 1956-11-14 1957-11-14 Process for preparing prints printed by the alcohol transfer process using the electrophotographic process using photoconductive layers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA26009A DE1082281B (en) 1956-11-14 1956-11-14 Process for the production of prints according to the alcohol transfer printing process with the aid of the electrophotographic process using photoconductive layers

Publications (1)

Publication Number Publication Date
DE1082281B true DE1082281B (en) 1960-05-25

Family

ID=6926041

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA26009A Pending DE1082281B (en) 1956-11-14 1956-11-14 Process for the production of prints according to the alcohol transfer printing process with the aid of the electrophotographic process using photoconductive layers

Country Status (6)

Country Link
US (1) US3128204A (en)
BE (2) BE562337A (en)
CH (1) CH369020A (en)
DE (1) DE1082281B (en)
FR (1) FR1190060A (en)
GB (2) GB883784A (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE1761529B1 (en) * 1967-06-05 1972-08-31 Dymo Industries Inc THERMOGRAPHIC COPYING PROCEDURE FOR ADDRESS PRINTING OR THE LIKE.

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BE587794A (en) * 1960-02-19
CH438943A (en) * 1964-05-25 1967-06-30 Lumiere Soc Method of making an electrophotographic material
CH438944A (en) * 1964-05-25 1967-06-30 Lumiere Soc Method of making an electrophotographic material
US3481738A (en) * 1966-09-21 1969-12-02 Ball Brothers Co Inc Presensitized photoengraving plate and method of making same
US3540886A (en) * 1968-06-25 1970-11-17 Desoto Inc Acidic photoconductive resin binders
GB1337427A (en) * 1970-05-12 1973-11-14 Kansai Paint Co Ltd Compositions for electrosensitive recording material
US3922448A (en) * 1973-05-21 1975-11-25 Ici America Inc Water-soluble polyester resin electrographic coatings
US3923509A (en) * 1973-05-21 1975-12-02 Ici America Inc Water-soluble polyester resins as binders for photoconductors
US4123271A (en) * 1974-01-22 1978-10-31 Mita Industrial Company, Limited Alkali metal dichromate as memory resistance improver for zinc oxide photoconductors in electrostatic photography

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Publication number Priority date Publication date Assignee Title
US2287348A (en) * 1939-05-11 1942-06-23 West Virginia Pulp & Paper Co Coating paper
US2273040A (en) * 1940-09-26 1942-02-17 Du Pont Chemical process and product
US2394009A (en) * 1943-04-30 1946-02-05 American Cyanamid Co Treatment of cellulosic materials
US2391621A (en) * 1943-09-17 1945-12-25 Carbide & Carbon Chem Corp Method of coating paper
US2399489A (en) * 1943-10-06 1946-04-30 American Cyanamid Co Coating compositions for paper and the like
US2663636A (en) * 1949-05-25 1953-12-22 Haloid Co Electrophotographic plate and method of producing same
US2748095A (en) * 1952-03-13 1956-05-29 Basf Ag Foils and coatings from mixtures of pastes of vinyl chloride polymers and plasticizers and aqueous paraffin wax emulsions
US2901348A (en) * 1953-03-17 1959-08-25 Haloid Xerox Inc Radiation sensitive photoconductive member
BE543624A (en) * 1954-12-15
BE541668A (en) * 1955-08-30
US2875054A (en) * 1956-05-24 1959-02-24 Eastman Kodak Co Preparation of coatings of improved internal strength
NL221062A (en) * 1956-09-25
GB893491A (en) * 1957-12-17 1962-04-11 Ozalid Co Ltd Improvements in or relating to photographic reproduction
BE585726A (en) * 1958-12-18

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1761529B1 (en) * 1967-06-05 1972-08-31 Dymo Industries Inc THERMOGRAPHIC COPYING PROCEDURE FOR ADDRESS PRINTING OR THE LIKE.

Also Published As

Publication number Publication date
GB883783A (en) 1961-12-06
CH369020A (en) 1963-04-30
US3128204A (en) 1964-04-07
FR1190060A (en) 1959-10-09
BE562338A (en)
BE562337A (en)
GB883784A (en) 1961-12-06

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