Agfa Gevaert Nv

Other

Jozef Willy Van Den Houte

Leon L Vermeulen

Robert J Pollet

Hendrik E Kokelenberg

Albert Lucien Poot

Rafael P Samijn

Urbain Leopold Laridon

Ludovicus Maria Mertens

Freddy Ghisleen Van Royen

Process for the production of a reverse reading positive line and/or halftone image suited for use in the production of a lithographic offset printing plate, said process comprising the steps of:

Production of reverse reading positive images of a straight reading

A photosensitive recording material, which comprises a support bearing a layer containing at least one photosensitve organic polyhalogen compound producing free radicals upon exposure to ultraviolet and/or visible light, a dye precursor, which by the action of said free radicals is capable of forming a dye, and a thermally activatable stabilizing substance within the scope of the following general formula: ##STR1## wherein: X represents

Stabilization of free-radical photosensitive materials

A recording process including image stabilization comprising the steps of:

Stabilization of photosensitive recording material

A photographic process wherein a visible image is formed by print-out or optical development in a recording material comprising in intimate admixture a spiropyran compound, an ultra-violet light-sensitive compound capable of producing an exposure with ultra-violet light with the spiropyran a dye salt and as sensitizing agent an organic nitrogen containing compound having a thiol group or in its tautomeric form a thione group as represented in the following tautomeric structural parts : ##EQU1## Preferred recording materials contain a spirodinaphthopyran compound, carbon tetrabromide and/or iodoform and as sensitizing agent 2-mercaptobenzthiazole in conjunction with a triaryl stibine as antifogging agent.

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Berchem, Belgium

Jozef Willy Van Den Houte