Photosensitive material and process for developing the same

Claim 2

A positive-working photosensitive material comprising: (1) a base material and (2) a layer of photosensitive composition formed on said base material and comprising (A), 100 weight parts of a resin binder containing at least 50 weight % of a vinylic polymer compound having an average polymerization degree of 300-2600 and represented by the general formula: ##STR6## wherein R represents hydrogen, hydroxyl, carboxyl, alkyl, alkoxyl, aryl, nitro, amino or halogen; and having a copolymerization ratio of x:y:z of 5-50:5-85:10-60 and (B), 3-30 weight parts of an aromatic diazonium salt having only a single diazo group.

Claim 3

A positive-working photosensitive material according to claim 1, wherein the copolymerization ratio of x:y:z in the vinylic polymer compound is 10-45:7-70:20-25.

Claim 4

A positive-working photosensitive material according to claim 1 or 2, wherein the base material is a sheet material of a thermoplastic or thermosetting polymer, metal or glass.

Claim 5

A process for developing a positive-working photosensitive material comprising: providing a base material; forming on said base material a layer of a photosensitive composition comprising (A), 100 weight parts of a resin binder containing at least 50 weight % of a vinylic polymer compound having an average polymerization degree of 300-2600 and represented by the general formula: ##STR7## wherein R represents hydrogen, hydroxyl, carboxyl, alkyl, alkoxyl, aryl, nitro, amino or halogen; and having a copolymerization ratio of x:y:z of 5-50:5-85:10-60 and (B), 3-30 weight parts of an aromatic diazonium salt having only a single diazo group; bringing said positive-working photosensitive material into intimate contact with a positive manuscript; exposing said positive-working photosensitive material to radiation through said manuscript; and developing said exposed material by contact with an alkali developer to obtain a positive relief image.

Claim 6

A process for developing a positive-working photosensitive material comprising: providing a base material; forming on said base material a layer of a photosensitive composition comprising (A), 100 weight parts of a resin binder containing at least 50 weight % of a vinylic polymer compound having an average polymerization degree of 300-2600 and represented by the general formula: ##STR7## wherein R represents hydrogen, hydroxyl, carboxyl, alkyl, alkoxyl, aryl, nitro, amino or halogen; and having a copolymerization ratio of x:y:z of 5-50:5-85:10-60 and (B), 3-30 weight parts of an aromatic diazonium salt having only a single diazo group; bringing said positive-working photosensitive material into intimate contact with a positive manuscript; exposing said positive-working photosensitive material to radiation through said manuscript; and developing said exposed material by contact with an alkali developer to obtain a positive relief image.

Claim 7

A process for developing a photosensitive material according to claim 4, wherein the copolymerization ratio of x:y:z in the vinylic polymer compound is 10-45:7-70:20-55.

Claim 8

A process for developing a photosensitive material according to claim 4, wherein an aqueous alkali solution has a pH of 12.0-12.8.

Claim 9

A process for developing a photosensitive material according to claim 4 or 5, wherein a coupler which reacts with the water soluble diazonium salt (B) to form an azo dye is dissolved in an aqueous alkali solution.