Hoechst Aktiengesellschaft

Werner Franke

Richard Brahm

Markus Seibel

Hans Trittler

A diazonium salt polycondensation product which comprises units of

Light-sensitive polycondensation product containing diazonium groups,

An electrophotographic recording material comprising an electrically conductive base material and at least one photoconductive layer containing an organic photoconductor, a binder, and at least one sensitizing dye represented by the formula ##STR1## wherein n denotes 2 or 3 and X.sup.- denotes a monovalent anion. The sensitizing dye has a sensitization maximum between 650 and 840 nm.

Organic electrophotographic material sensitized by cyanine dye

An electrophotographic recording material is disclosed which comprises an electrically conductive support and a photoconductive layer containing a photoconductor comprised of zinc oxide, a binder, and a sensitizing agent comprised of an alkylated trimethine-cyanine dye having a particular structure. The disclosed electrophotographic material possesses a sharply pronounced, selective sensitization having a peak at about 495 nm, and can be safely handled under green, yellow and red safelights.

Electrophotographic recording material containing zinc oxide and cyanine

In an electrophotographic recording material comprising an electrically conductive base material and at least one photoconductive layer containing a photoconductor, a binder and at least three sensitizing dyes of which at least two are 3,3'-dimethylindolenine compounds, such as bis-(3,3'-dimethylindolenyl)-trimethinecyanines and -pentamethinecyanines, having a sensitizing action in different wavelength regions, it is possible to sensitize various organic and inorganic photoconductors within the range from about 400 to 700 nm.

Electrophotographic material sensitized by 3,3'-dimethylindolenine

An electrophotographic recording material is described which comprises an electrically conductive support and a photoconductive layer comprising a photoconductor, a binder, and at least one bis-benzothiazole-pentamethine-cyanine having a particular structure. The aforementioned recording material displays a sensitization peak in the range between about 680 nm and 710 nm, and can be processed under visual control using bright safelights.

Electrophotographic recording material

The present invention discloses an electrophotographic recording material comprising an electrically conductive support and at least one photoconductive layer which comprises an organic photoconductor, for example, oxazole derivatives or oxadiazole derivatives, a sensitizing dye, a binder, and customary additives. The sensitizing dye contained in the photoconductive layer comprises a compound corresponding to the general formula ##STR1## wherein R is chlorine or bromine,

Electrophotographic material with cyanine sensitizer with betaine group

This invention relates to an improvement in a light-sensitive layer transfer material comprising a temporary film support and a light-sensitive thermoplastic photoresist layer detachably connected therewith, the improvement being that the underside of the film support has a lower adhesion to the photoresist layer than its upper side. The invention also relates to a process for transferring a light-sensitive photoresist layer from a temporary to a permanent support.

Light-sensitive layer transfer material

An electrophotographic recording material comprising an electrically conductive support, a photoconductor layer and an about 1 to about 50 .mu.m thick protective layer comprising a radiation-hardened, crosslinked polyester which is formed from trimethylol propane, adipic acid and acrylic acid and which has a surface resistance ranging from about 5.5.multidot.10.sup.12 to about 2.5.multidot.10.sup.13 ohm and a volume resistivity ranging from about 7.multidot.10.sup.10 to about 5.multidot.10.sup.13 ohm cm, measured at 23.degree. C. and 50 percent relative humidity, and a process for producing such a recording material.

Electrophotographic recording material and process for its production

This invention relates to an improvement in a process for making relief-type recordings, in which a layer transfer material comprising a solid photopolymerizable layer on a flexible temporary layer support, is applied to a permanent layer support in such a manner that the photopolymerizable layer is firmly bonded to the latter, the photopolymerizable layer adhering to the permanent layer support is then imagewise exposed, with the temporary layer support being removed before or after exposure, the unexposed layer areas are washed away with a developer, and the surface areas of the permanent support bared by washing are modified by etching or depositing a metal, if required, the improvement which comprises using a photopolymerizable layer which is composed of at least two photopolymerizable partial layers of different compositions.

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Wiesbaden, Germany

Werner Franke