B - Operations – Transporting – 41 – N
Patent
B - Operations, Transporting
41
N
96/3, 101/61, 31
B41N 1/22 (2006.01) G03G 5/082 (2006.01) G03G 13/28 (2006.01)
Patent
CA 1086562
ABSTRACT A flexible offset printing plate is formed from a directly imaged electrophotographic member comprising an inorganic coating of a photoconductive material on a polymer substrata. The photoconductive material is an oriented crystalline deposit about 3000 Angstroms thick which has been directly sputtered with radiofrequency energy in a process using a Langmuir sheath to produce a light sensitive, readily imaged abrasion-resistant, transparent coating. It is deposited on a sheet of dimensionally stable, transparent polyester film having thickness of about .005 inch with an intervening sandwiched layer of ohmic material such as indiumtin oxide about 300 Angstroms thick. The transparency of the ohmic layer and the photoconductive coating on a transparent substrate result in a transparent plate. The electrophotographic member is imaged by charging, exposure and toning with a suitable toner. The non-imaged parts of the surface are rendered hydro- philic (having a strong affinity for water and repellant to greasy ink) by treating the surface with one of the group a silicate polymer, a sodium aluminum hydroxide, a ferrocyanide reacted etch solution and a polyvinyl alcohol rendered insoluble in water while the imaged and toned parts are renderred hydrophobic (water-repellant and having a strong affinity for greasy ink), the treatment maintaining the other physical characteristics of the photoconductive coating unchanged.
265859
Ignasiak Stanley F.
Kuehnle Manfred R.
Martinez Ferdinand
Coulter Systems Corporation
Johnson Douglas S. Q.c.
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