Silver-free light-sensitive material
AssigneeVEB Filmfabrik Wolfen
InventorsCarmen Haessner geb. Michael, Heinz Mustroph, Jorg Marx
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AssigneeVEB Filmfabrik Wolfen
InventorsCarmen Haessner geb. Michael, Heinz Mustroph, Jorg Marx
Estimating the term…
This invention relates to a radiation-sensitive, silver-free recording material for direct optical recording with high sensitivity, characterized by its exceptional resistance to light and heat and large solubility. This is achieved by the fact that the recording material contains as coloring substances, azo dyestuffs of the general formula ##STR1## R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 are the same or different and are halogen, alkoxy, alkyl, acetyl, amino; R.sub.8 hydroxy, alkoxy or acetylamino. The material distinguishes itself by the different processing variations that are possible so that with a same basic type, it is possible to obtain pictures operating according to a positive principle as well as according to a negative principle.
A silver-free, light sensitive composition, comprising an organic polyhalide compound capable of splitting into reactive radicals when exposed to ultraviolet rays, and an azo dyestuff of the general formula ##STR26## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 are the same or different and are hydrogen, fluoro, chloro, bromo, iodo, hydroxy, nitro, cyano, acetyl, acetylamino, trifluoromethyl, alkyl with 1 to 6 carbon atoms, alkoxy with 1 to 6 carbon atoms, cyanoalkoxy with 1 to 4 carbon atoms, fluorinated alkoxy with 1 to 4 carbon atoms, ##STR27## R.sub.6, R.sub.7 are the same or different and are aralkyl, cyanoalkyl, alkyl with 1 to 6 carbon atoms, hydroxyalkyl with 1 to 6 carbon atoms, R.sub.6 and R.sub.7 together form a 5- or 6-membered heterocyclic ring or a 5- or 6-membered heterocyclic ring with an additional heteroatom,
Dependencies are inferred from the claim text.