Radiation sensitive composition including haloalkyl- s-triazine, acid sensitive dyestuff and positive acting diazo oxide

Abstract From the Canadian patent

A colored, positive-acting radiation-sensitive composition, whose color is extinguished or greatly decreased in intensity upon irradiation comprising at least one acid-free resin at least, one component which upon irradiation yields acidic and/or free radical products, at least one acid and/or free radical sensitive dyestuff and at least one positive-acting component; positiveacting elements comprising suitable support materials at least one surface of which has been coated with the above composition and lithographic printing plates comprising the above elements wherein the support materials are lithographically suitable support materials, which have been imagewise exposed to radiation …