Silver halide light sensitive emulsion layer having enhanced photographic sensitivity
This invention comprises a photographic element comprising at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula X-H, wherein X is an electron donor moiety to which a base, B-, is covalently linked and H is a leaving hydrogen atom, and wher...
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Main Authors | , , , , , |
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Format | Patent |
Language | English |
Published |
30.11.1999
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Edition | 6 |
Subjects | |
Online Access | Get full text |
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Summary: | This invention comprises a photographic element comprising at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula X-H, wherein X is an electron donor moiety to which a base, B-, is covalently linked and H is a leaving hydrogen atom, and wherein: 1) X-H has an oxidation potential between 0 and about 1.4 V; and 2) the oxidized form of X-H undergoes deprotonation reaction with the base B-, to give the radical X. and the protonated base B-H. In a preferred embodiment of the invention, the radical X. has an oxidation potential <-0.7V. |
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Bibliography: | Application Number: US19980118536 |