E.i. Dupont De Nemours and Company

Catherine T Chang

Graciela Beatriz Blanchet-Fincher

Curtis R Fincher

Richard Douglas Bauer

Allan Cairncross

Richard J Kempf

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. The master is useful in making proofs that duplicate the image achieved by printing, and manufacture of printed circuit boards, etc.

Positive-working photosensitive electrostatic master with improved

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.

Positive-working photosensitive electrostatic master

Xeroprinting process comprising (A) exposing imagewise to actinic radiation a photohardenable electrostatic master comprising

Photohardenable electrostatic element with improved environmental

Photohardenable electrostatic master with improved environmental latitude and dot shape comprising

Inhibitor-containing photohardenable electrostatic master compositions

Photohardenable electrostatic master with improved backtransfer characteristics comprising

Photohardenable electrostatic element with improved backtransfer

Photohardenable electrostatic master with improved environmental latitude comprising

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.

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Wilmington, DE, United States of America

Catherine T Chang