Diazotype photographic elements having extended exposure latitude with specific u-v absorber
Abstract
Abstract DIAZOTYPE PHOTOGRAPHIC ELEMENTS HAVING STRATIFIED LIGHT-SENSITIVE LAYERS INCLUDING A DIAZONIUM SALT AND A COUPLER COMPOUND WHICH CAN REACT WITH THE DIAZONIUM SALT TO PRODUCE AN AZO DYE ARE ABLE TO REPRODUCE HIGHLIGHT AND SHADOW DETAILS OF CONTINUOUS TONE IMAGES UNDER WIDELY VARYING EXPOSURE CONDITIONS AND WITHOUT BACKGROUND STAIN BY THE INCLUSION THEREIN OF AN ALKALINEBLEACHABLE ULTRAVIOLET ABSORBER LAYER WHICH IS POSITIONED SUCH THAT IT INTERCEPTS ACTIVATING EXPOSING RADIATION NOT LATER THAN ITS PASSAGE THROUGH THE TERMINALLY IRRADIATED LIGHT-SENSITIVE LAYER. ADVANTAGEOUS ULTRAVIOLET ABSORBER MATERIALS INCLUDE SUBSTITUTED PYRYLIUM SALTS AND SUBSTITUTED THIAPYRYLIUM SALTS SUCH AS 2,4,6-TRIPHENYLTHISPYRYLIUM FLUOROBORATE. ADDITIONALLY, DUPLICATING CHARACTERISTICS INCLUDING THE PRINT SPEED AND IMAGE QUALITY OF SUBSEQUENT GENERATION COPIES ARE IMPROVED.
Inventors
- 👤 James G Mcnally Jr
Bibliographic Details
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