公开(公告)号：AU3772378A

公开(公告)日：1980-01-10

申请号：AU3772378

申请日：1978-07-03

Applicant: HOECHST AG

Inventor： WIEDEMANN WOLFGANG DR

IPC: G03G5/05 ,  G03G5/06 ,  G03G5/10 ,  G03G5/04 ,  G03G5/08 ,  G03G5/14

Abstract: This invention relates to an improvement in an electrophotographic recording material comprising an electrically conductive support, optionally an insulating intermediate layer, and a photoconductive layer composed of at least one layer comprising charge carrier-producing and charge transporting compounds, a binder, and conventional additives, the improvement that the recording material comprises a 75 to 250 mu m thick support and, in the form of a photoconductor web, is sufficiently flexible that it is not prone to the formation of hairline cracks when repeatedly conducted over rollers of at least 18 mm diameter, said binder being a cellulose acyl ester with an acetyl content of not more than 30 percent and a viscosity of more than 15 poises, measured by the ASTM methods D 817-65, Formula A, and D 1343-56.

公开(公告)号：DE2336094A1

公开(公告)日：1975-02-06

申请号：DE2336094

申请日：1973-07-16

Applicant: HOECHST AG

Inventor： WIEDEMANN WOLFGANG DR

IPC: G03G5/06 ,  G03G5/043 ,  G03G5/08 ,  G03G5/04

公开(公告)号：DE3537979A1

公开(公告)日：1987-04-30

申请号：DE3537979

申请日：1985-10-25

Applicant: HOECHST AG

Inventor： WIEDEMANN WOLFGANG DR ,  DREXLER MICHAEL ,  FUERDERER JUERGEN

IPC: G03G5/00 ,  G03G5/04 ,  G03G5/06 ,  G03G5/07 ,  G03G5/14

Abstract: An electrophotographic recording material is described that comprises an electrically conducting base layer and a photoconductive system deposited thereon, which system comprises an optional insulating intermediate layer, a layer containing a charge-generating compound, and a layer containing a charge-transporting compound mixed with binders, along with any sensitizers, acceptors and usual additives. The photoconductive system contains, as acceptor additive, one or more monomeric or polymeric compounds that have electron-attracting substitutents (halogen, cyano, nitro groups) and that are selected from the group consisting of anthracene, acridine, the anhydrides of phthalic acid, maleic acid, pyromellitic acid, benzophenonetetracarboxylic acid, and the polymers of vinyl chloride, vinylidine chloride and nitrocellulose, in a quantity of 0.2 to 10% by weight based on total coating weight. After erasure of the latent electrostatic image, the recording material has a low residual charge, even when operated cyclically. Background imaging is thereby avoided.

公开(公告)号：DE3535838A1

公开(公告)日：1987-04-09

申请号：DE3535838

申请日：1985-10-08

Applicant: HOECHST AG

Inventor： WIEDEMANN WOLFGANG DR ,  DEGER HANS-M DR ,  GUENTHER DIETER DR

IPC: G03G5/06 ,  C09B57/00 ,  G03G5/14 ,  G03G13/28

公开(公告)号：DE3172532D1

公开(公告)日：1985-11-07

申请号：DE3172532

申请日：1981-08-24

Applicant: HOECHST AG

Inventor： WIEDEMANN WOLFGANG DR

IPC: G03G5/00 ,  G03G5/14 ,  G03G5/147

Abstract: An electrophotographic recording material comprising an electrically conductive support, an optional insulating intermediate layer, at least one photoconductive layer comprising a charge carrier generating compound and a charge transporting compound, and a protective transparent cover layer made from a surface abrasion resistant binder composed of a polyurethane resin, polycarbonate resin, phenoxy resin, polyacrylate or polymethacrylate resin, polyurethane formed from a two-component system comprising a polyisocyanate and a hydroxyl group containing polyester or polyether, a polyisocyanate and a hydroxyl group containing acrylic or epoxy resin, polyurethane formed from a one-component system comprising a polyisocyanate prepolymer, or a polyisocyanate having temporarily masked isocyanate groups.

公开(公告)号：DE2860771D1

公开(公告)日：1981-09-24

申请号：DE2860771

申请日：1978-07-26

Applicant: HOECHST AG

Inventor： WIEDEMANN WOLFGANG DR

IPC: G03G5/05 ,  G03G5/06 ,  G03G5/10

Abstract: This invention relates to an improvement in an electrophotographic recording material comprising an electrically conductive support, optionally an insulating intermediate layer, and a photoconductive layer composed of at least one layer comprising charge carrier-producing and charge transporting compounds, a binder, and conventional additives, the improvement that the recording material comprises a 75 to 250 mu m thick support and, in the form of a photoconductor web, is sufficiently flexible that it is not prone to the formation of hairline cracks when repeatedly conducted over rollers of at least 18 mm diameter, said binder being a cellulose acyl ester with an acetyl content of not more than 30 percent and a viscosity of more than 15 poises, measured by the ASTM methods D 817-65, Formula A, and D 1343-56.

公开(公告)号：DE3502681A1

公开(公告)日：1986-07-31

申请号：DE3502681

申请日：1985-01-26

Applicant: HOECHST AG

Inventor： WIEDEMANN WOLFGANG DR ,  GUENTHER DIETER DR

IPC: G03G15/22 ,  C07D471/14 ,  G03G5/05 ,  G03G5/06

公开(公告)号：DE3167804D1

公开(公告)日：1985-01-31

申请号：DE3167804

申请日：1981-05-14

Applicant: HOECHST AG

Inventor： WIEDEMANN WOLFGANG DR

IPC: C09B5/62 ,  G03G5/06

公开(公告)号：DE2860772D1

公开(公告)日：1981-09-24

申请号：DE2860772

申请日：1978-07-26

Applicant: HOECHST AG

Inventor： WIEDEMANN WOLFGANG DR

IPC: G03G5/00 ,  G03G5/05 ,  G03G5/06 ,  G03G5/10

Abstract: This invention relates to an improvement in an electrophotographic recording material comprising an electrically conductive support, optionally an insulating intermediate layer, and a photoconductive layer composed of at least one layer comprising charge carrier-producing and charge transporting compounds, a binder, and conventional additives, the improvement that the recording material comprises a 75 to 250 mu m thick support, and, in the form of a photoconductor web, is sufficiently flexible that it is not prone to the formation of hairline cracks when repeatedly conducted over rollers of at least 12 mm diameter, said binder being a cellulose nitrate with a viscosity of 400+/-25 cPoises at concentrations between about 4 and 12 percent in a 5 percent aqueous acetone solution, according to DIN 53 179 (standard type 4-12).

公开(公告)号：AU7116774A

公开(公告)日：1976-01-15

申请号：AU7116774

申请日：1974-07-12

Applicant: HOECHST AG

Inventor： WIEDEMANN WOLFGANG DR

IPC: C08G10/00 ,  G03G5/043 ,  G03G5/06 ,  G03G5/07 ,  G03G5/08 ,  H01L31/08 ,  G03G5/04

Abstract: This invention relates to an article which comprises an electrically conductive carrier layer, a layer comprising a material selected from the group consisting of selenium or selenium-tellurium, and, on the side of the selenium or selenium-tellurium layer remote from the carrier layer, a layer comprising an oligomeric condensation product of 3-bromopyrene and formaldehyde having a degree of polycondensation of 6 to 10.