Two-component diazotype material

Details Two-component diazotype material Two-component diazotype material

G - Physics

03

C

96/161

G03C 1/54 (2006.01) G03C 1/61 (2006.01)

Patent

CA 1211977

ABSTRACT OF THE DISCLOSURE The present invention relates to a two-component diazotype material comprising a support and one or several light-sensitive layers, each of which contains at least one light-sensitive diazonium salt, a coupler component and an acid stabilizer, and at least one of the layers contains a compound which absorbs light in the ultraviolet spectral region. The light-absorbing compound is present in the form of a dye salt of at least one benzothiazole which is converted into its leuco base under the action of an alkaline medium. It thus partially or completely loses its absorp- tivity toward radiation in the long-wave ultraviolet and short-wave visible spectral regions. The light-absorbing compound comprises a benzothiazole, in particular according to the general formula: Image wherein R1 denotes hydrogen, alkyl or aralkyl, R2 denotes hydrogen or an optionally sub- stituted alkyl, aralkyl, aryl, pyridylalkyl, carbalkyl, carboxyalkyl, carboxyaryl, carbamoyl, or sulfamoyl radical, or R1 and R2 denote members of a heterocyclic radical,and R3 denotes hydrogen or alkyl.

448420

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