Process for the preparation of positive copies and material for performing the process

Abstract

Abstract 1,094,368. Photographic process. KALLE A.G. Dec.29, 1965 [Dec.30, 1964], No.55094/65. Heading G2C. A light-sensitive material comprising a hydrophilic support carrying a coating containing a light-sensitive monomeric vinyl compound, a photo-sensitive organic halogen compound and a polymerization inhibitor is imagewise exposed, and developed by treating with an aqueous solution of a dye. Specified vinyl compounds are those having a vinyl group attached to an aromatic ring, and such compounds may be used in conjunction with one of a number of other vinyl compounds which include N-vinyl compounds wherein the vinyl group replaces an acid hydrogen atom, e.g. amides; α-#- unsaturated acids and derivatives thereof; vinyl-halides; and dienes. Many halogen compounds are exemplified. Suitable polymerisation inhibitors, which may be present as 0À0001-3% by wt., include organic amino compounds, aromatic hydroxy compounds, carboxylic acids, sulphur compounds, ferrocenes, benzoin, benzil and benzophenone. The support, which may be coated paper, hydrophilic plastics or coated plastics, may be pre-coated with a mixture of a water-wettable pigment and a binder. Various inorganic pigments and undissolved starch are specified as pigments. The aqueous dye solution may contain an anti-wetting agent. The exposed material may be optionally pre-heated before development. The dye is preferably coloured in neutral or basic conditions but not in acid conditions.

Inventors

• 👤 Johannes Munder
• 👤 Roland Moraw
• 👤 Ernst-August Hackmann

Bibliographic Details