Positive-working radiation-sensitive recording material with radiation-sensitive 1,2-quinone diazide underlayer and thicker positive-working radiation-sensitive overlayer

Claim 1

A positive-working radiation-sensitive recording material comprising: (a) a support; (b) a first radiation-sensitive layer consisting essentially of an admixture of a radiationsensitive 1,2-quinone diazide in an amount to provide stabilizer action on a second radiationsensitive layer, and a polymeric water-insoluble binder in an amount to provide film forming property to the first radiation-sensitive layer overlying said support; and (c) a second radiation-sensitive layer, thicker than said first layer and overlying said first layer, consisting essentially of in admixture: a compound which forms a strong acid under the action of actinic radiation selected from the group consisting of a diazonium, phosphonium, sulfonium and iodonium salts, halogen compounds and organometal-organohalogen combinations, a compound which has at least one acid-cleavable C--O--C bond, said acid-forming and acid-cleavable compound present in amounts sufficient to increase the solubility of portions of said second layer exposed to actinic radiation so that an image can be developed, and a polymeric binder in an amount sufficient to form a uniform layer said recording material having an improved storage stability.