| 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 DEG C. and at least one binder having a Tg of 70 DEG C. or less such that the shift in transit time (aT) of the photosensitive layer in the range of 30%</=relative humidity</=60% and 65 DEG F. (18.3 DEG C.)</=temperature </=80 DEG F. (26.7 DEG 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. |