Photographic elements containing ballasted electron-accepting nu

Details Photographic elements containing ballasted electron-accepting nu Photographic elements containing ballasted electron-accepting nu

1977-03-07

1979-02-13

Schilling, Richard L.

Gas separation: apparatus

Magnetic separating means

And electric field separation apparatus

96 16, 96 29D, 96 50R, 96 51, 96 73, 96 74, 96 76R, 96 76C, 96 77, 96 95, 96 99, 96100R, 96109, 96111, G03C 700, G03C 554, G03C 140, G03C 148

Patent

active

041393791

ABSTRACT:
Photographic elements, processes for forming images in photographic elements and new compounds are disclosed. Generally, the invention relates to ballasted electron-accepting nucleophilic displacement compounds; after acceptance of at least one electron (reduction) by a nucleophile precursor group, the compounds are capable of undergoing intramolecular nucleophilic displacement to release a diffusible moiety, such as an image dye or a photographic reagent. In certain embodiments, the ballasted electron-accepting nucleophilic displacement compounds are used in combination with electron donors and electron-transfer agents. The processes disclosed are particularly useful in providing positive transfer images using negative-working silver halide emulsions.

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