Light-sensitive positive copying material with alkali soluble polycondensation binder

Claim 1

Light-sensitive copying material comprising an aluminum support having a surface that is pretreated by being electrochemically roughened and anodically oxidized and a positive-acting, light-sensitive layer provided on said surface, which light-sensitive layer is comprised of (A) an amount of a positive-acting light-sensitive compound sufficient to impart light-sensitivity to said mixture and (B) a binder which is insoluble in water and soluble in aqueous-alkaline solutions, wherein said binder comprises a polycondensation product of (i) a phenol corresponding to the formula ##STR3## wherein R 1 is a hydrogen atom, an alkyl group or a hydroxy group, R 2 is a hydrogen atom, an alkyl group, a hydroxy group or an acetyl group, and R 3 is a hydrogen atom or a halogen atom, an alkyl group, an alkoxy group, a carboxyl group or a carboxylic acid ester group, and (ii) a compound corresponding to the formula ROCH.sub.2 --X--CH.sub.2 OR, wherein R is a hydrogen atom, a methyl group, an ethyl group or an acetyl group and X is a phenylene group or a divalent aromatic group which comprises two phenylene groups linked by (a) a single bond, (b) an ether group, (c) a sulfide group, (d) a sulfone group, or (e) an alkylene group, and which may be unsubstituted or substituted.