Abstract: High resolution, photosensitive electrostatic master which is positive-working with a single imagewise exposure comprising a conductive support bearing a layer of a photosensitive composition consisting essentially of (a) at least two polymeric binders, at least one binder having a Tg greater than 80.degree. C. and at least one binder having a Tg of 70.degree. C. or less such that the shift in transit time (a.sub.T) of the photosensitive layer in the range of 30%.ltoreq.relative humidity.ltoreq.60% and 65.degree. F. (18.3.degree. C.).ltoreq.temperature .ltoreq.80.degree. F. (26.7.degree. C.) is 10 or less, (b) a hexaarylbiimidazole photooxidant, (c) leuco dye, preferably stabilized, oxidized by (b), (d) a nonionic halogenated compound, preferably a hydrocarbon, and (e) at least one compatible plasticizer. A process of making positive images by a single imagewise exposure is described.

Abstract: High resolution photosensitive electrostatic master which forms conductive exposed image areas upon imagewise exposure comprising an electrically conductive substrate bearing a photosensitive layer consisting essentially of at least one acid labile compound which decomposes to form acid, and a photoinitiator or photoinitiating system which upon exposure generates a catalytic amount of a strong acid. A xeroprinting process from producing positive images in said photosensitive layer of the master is also disclosed. The master is useful in the graphic arts field. e.g., making color proofs, preparation of printing circuit boards, resists, solder masks, etc.

Abstract: Xeroprinting process comprising(A) exposing imagewise to actinic radiation a photohardenable electrostatic master comprising(1) an electrically conductive substrate, and(2) a layer of photohardenable composition consisting essentially of(a) at least two organic polymeric binders, at least one having a Tg greater than 80.degree. C. and at least one having a Tg less than 70.degree. C.,(b) at least one monomeric compound having at least one ethylenically unsaturated group, and(c) a photoinitiator or photoinitiator system, the shift in transit time (a.sub.T) of the photohardenable layer in the range of 30%.ltoreq.relative humidity.ltoreq.60% and 15.6.degree. C..ltoreq.temperature .ltoreq.26.7.degree. C. is 15 or less, preferably 10 or less(B) charging the photohardenable master electrostatically,(C) applying an oppositely charged electrostatic toner, and(D) transferring the toned image to a receptor surface.

Abstract: Photohardenable electrostatic master with improved backtransfer characteristics comprising(1) an electrically conductive substrate, and(2) a layer of photohardenable composition consisting essentially of(a) at least one organic polymeric binder,(b) at least one compound having at least one ethylenically unsaturated group, and(c) a photoinitiator or photoinitiator system, and(d) an acidic additive as defined.A xeroprinting process is described using the master. The master is used in graphic arts, color proofing which duplicates images produced by printing, preparation of printed circuit boards, resists, soldermasks, etc.

Abstract: Photohardenable electrostatic master with improved environmental latitude comprising(1) an electrically conductive substrate, and(2) a layer of photohardenable composition consisting essentially of(a) at least two organic polymeric binder, at least one having a Tg greater than 80.degree. C. and at least one having a Tg less than 70.degree. C.,(b) at least one monomeric compound having at least one ethylenically unsaturated group, and(c) a photoinitiator or photoinitiator system, the shift in transit time (a.sub.T) of the photohardenable layer in the range of 30%.ltoreq.relative humidity.ltoreq.60% and 15.6.degree. C..ltoreq.temperature.ltoreq.26.7.degree. C. is 15 or less, preferably 10 or less. A xeroprinting process is described using the master. The master is used in graphic arts, color proofing which duplicates images produced by printing, preparation of printed circuit boards, resists, soldermasks, etc.

Abstract: Compositions and films are provided for the preparation of electrostatic printing masters. The composition binder permits use of aqueous silver halide photographic techniques to image the master for printing, and exhibits insulation properties needed for electrostatic printing under typical conditions of relative humidity.